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aria-current="page">4 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.10350">arXiv:2501.10350</a> <span> [<a href="https://arxiv.org/pdf/2501.10350">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Resolving discrepancies in bang-time predictions for ICF experiments on the NIF: Insights from the Build-A-Hohlraum Campaign </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Swadling%2C+G+F">G. F. Swadling</a>, <a href="/search/physics?searchtype=author&query=Farmer%2C+W+A">W. A. Farmer</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+H">H. Chen</a>, <a href="/search/physics?searchtype=author&query=Aybar%2C+N">N. Aybar</a>, <a href="/search/physics?searchtype=author&query=Rubery%2C+M+S">M. S. Rubery</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M+B">M. B. Schneider</a>, <a href="/search/physics?searchtype=author&query=Liedahl%2C+D+A">D. A. Liedahl</a>, <a href="/search/physics?searchtype=author&query=Lemos%2C+N+C">N. C. Lemos</a>, <a href="/search/physics?searchtype=author&query=Tubman%2C+E">E. Tubman</a>, <a href="/search/physics?searchtype=author&query=Ross%2C+J+S">J. S. Ross</a>, <a href="/search/physics?searchtype=author&query=Hinkel%2C+D+E">D. E. Hinkel</a>, <a href="/search/physics?searchtype=author&query=Landen%2C+O+L">O. L. Landen</a>, <a href="/search/physics?searchtype=author&query=Rosen%2C+M+D">M. D. Rosen</a>, <a href="/search/physics?searchtype=author&query=Newman%2C+S+R+K">S. Rogers K. Newman</a>, <a href="/search/physics?searchtype=author&query=Yanagisawa%2C+D">D. Yanagisawa</a>, <a href="/search/physics?searchtype=author&query=Roskopf%2C+N">N. Roskopf</a>, <a href="/search/physics?searchtype=author&query=Vonhof%2C+S">S. Vonhof</a>, <a href="/search/physics?searchtype=author&query=Aghaian%2C+L">L. Aghaian</a>, <a href="/search/physics?searchtype=author&query=Mauldin%2C+M">M. Mauldin</a>, <a href="/search/physics?searchtype=author&query=Reichelt%2C+B+L">B. L. Reichelt</a>, <a href="/search/physics?searchtype=author&query=Kunimune%2C+J">J. Kunimune</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2501.10350v1-abstract-short" style="display: inline;"> This study investigated discrepancies between measured and simulated x-ray drive in Inertial Confinement Fusion (ICF) hohlraums at the National Ignition Facility (NIF). Despite advances in radiation-hydrodynamic simulations, a consistent "drive deficit" remains. Experimentally measured ICF capsule bang-times are systematically 400-700 ps later than simulations predict. The Build-A-Hohlraum (BAH) c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.10350v1-abstract-full').style.display = 'inline'; document.getElementById('2501.10350v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.10350v1-abstract-full" style="display: none;"> This study investigated discrepancies between measured and simulated x-ray drive in Inertial Confinement Fusion (ICF) hohlraums at the National Ignition Facility (NIF). Despite advances in radiation-hydrodynamic simulations, a consistent "drive deficit" remains. Experimentally measured ICF capsule bang-times are systematically 400-700 ps later than simulations predict. The Build-A-Hohlraum (BAH) campaign explored potential causes for this discrepancy by systematically varying hohlraum features, including laser entrance hole (LEH) windows, capsules, and gas fills. Overall, the agreement between simulated and experimental x-ray drive was found to be largely unaffected by these changes. The data allows us to exclude some hypotheses put forward to potentially explain the discrepancy. Errors in the local thermodynamic equilibrium (LTE) atomic modeling, errors in the modeling of LEH closure and errors due to a lack of plasma species mix physics in simulations are shown to be inconsistent with our measurements. Instead, the data supports the hypothesis that errors in NLTE emission modeling are a significant contributor to the discrepancy. X-ray emission in the 2 - 4 keV range is found to be approximately 30% lower than in simulations. This is accompanied by higher than predicted electron temperatures in the gold bubble region, pointing to errors in non-LTE modeling. Introducing an opacity multiplier of 0.87 on energy groups above 1.8 keV improves agreement with experimental data, reducing the bang-time discrepancy from 300 ps to 100 ps. These results underscore the need for refined NLTE opacity models to enhance the predictive power of hohlraum simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.10350v1-abstract-full').style.display = 'none'; document.getElementById('2501.10350v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LLNL-JRNL-871898-DRAFT </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.12557">arXiv:2412.12557</a> <span> [<a href="https://arxiv.org/pdf/2412.12557">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physrep.2024.10.008">10.1016/j.physrep.2024.10.008 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ultrafast demagnetization in ferromagnetic materials: Origins and progress </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Chen%2C+X">Xiaowen Chen</a>, <a href="/search/physics?searchtype=author&query=Adam%2C+R">Roman Adam</a>, <a href="/search/physics?searchtype=author&query=B%C3%BCrgler%2C+D+E">Daniel E. B眉rgler</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+F">Fangzhou Wang</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+Z">Zhenyan Lu</a>, <a href="/search/physics?searchtype=author&query=Pan%2C+L">Lining Pan</a>, <a href="/search/physics?searchtype=author&query=Heidtfeld%2C+S">Sarah Heidtfeld</a>, <a href="/search/physics?searchtype=author&query=Greb%2C+C">Christian Greb</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+M">Meihong Liu</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+Q">Qingfang Liu</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+J">Jianbo Wang</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+C+M">Claus M. Schneider</a>, <a href="/search/physics?searchtype=author&query=Cao%2C+D">Derang Cao</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2412.12557v1-abstract-short" style="display: inline;"> Since the discovery of ultrafast demagnetization in Ni thin films in 1996, laser-induced ultrafast spin dynamics have become a prominent research topic in the field of magnetism and spintronics. This development offers new possibilities for the advancement of spintronics and magnetic storage technology. The subject has drawn a substantial number of researchers, leading to a series of research ende… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.12557v1-abstract-full').style.display = 'inline'; document.getElementById('2412.12557v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.12557v1-abstract-full" style="display: none;"> Since the discovery of ultrafast demagnetization in Ni thin films in 1996, laser-induced ultrafast spin dynamics have become a prominent research topic in the field of magnetism and spintronics. This development offers new possibilities for the advancement of spintronics and magnetic storage technology. The subject has drawn a substantial number of researchers, leading to a series of research endeavors. Various models have been proposed to elucidate the physical processes underlying laser-induced ultrafast spin dynamics in ferromagnetic materials. However, the potential origins of these processes across different material systems and the true contributions of these different origins remain challenging in the realm of ultrafast spin dynamics. This predicament also hinders the development of spintronic terahertz emitters. In this review, we initially introduce the different experimental methods used in laser-induced ultrafast spin dynamics. We then systematically explore the magnetization precession process and present seven models of ultrafast demagnetization in ferromagnetic materials. Subsequently, we discuss the physical processes and research status of four ultrafast demagnetization origins (including spin-flipping, spin transport, non-thermal electronic distribution, and laser-induced lattice strain). Since attosecond laser technique and antiferromagnetic materials exhibit promising applications in ultrahigh-frequency spintronics, we acknowledge the emerging studies used by attosecond pules and studies on ultrafast spin dynamics in antiferromagnets, noting the significant challenges that need to be addressed in these burgeoning field. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.12557v1-abstract-full').style.display = 'none'; document.getElementById('2412.12557v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.02502">arXiv:2412.02502</a> <span> [<a href="https://arxiv.org/pdf/2412.02502">pdf</a>, <a href="https://arxiv.org/format/2412.02502">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Emerging Technologies">cs.ET</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Systems and Control">eess.SY</span> </div> </div> <p class="title is-5 mathjax"> Analysis, Design, and Fabrication of a High-Gain Low-Profile Metasurface Antenna Using Direct Feeding of Sievenpiper s HIS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ghaneizadeh%2C+A">Alireza Ghaneizadeh</a>, <a href="/search/physics?searchtype=author&query=Peik%2C+S+F">Soeren F. Peik</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Martin Schneider</a>, <a href="/search/physics?searchtype=author&query=Joodaki%2C+M">Mojtaba Joodaki</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2412.02502v1-abstract-short" style="display: inline;"> HISs have recently shown the ability to support leaky waves, and to excite plasmonic and HIS resonance frequency modes for use as an antenna. In this paper, we analyzed, designed, and fabricated a TMA by directly feeding edge-located HIS cells through a microstrip feeding network. In contrast to other metasurface antennas that necessitate an external antenna to excite metasurfaces, our approach is… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.02502v1-abstract-full').style.display = 'inline'; document.getElementById('2412.02502v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.02502v1-abstract-full" style="display: none;"> HISs have recently shown the ability to support leaky waves, and to excite plasmonic and HIS resonance frequency modes for use as an antenna. In this paper, we analyzed, designed, and fabricated a TMA by directly feeding edge-located HIS cells through a microstrip feeding network. In contrast to other metasurface antennas that necessitate an external antenna to excite metasurfaces, our approach is inspired by the TMA design methodology that directly feeds the HIS cells rather than using it as a reflector. We developed a circuit model for the proposed structure and compared the results with those obtained from full-wave simulations. In addition, our further objective was to simplify the structure based on the working principle of the proposed antenna. This objective was achieved by converting square patches into parallel strip lines, leading to an aperture efficiency of 0.77. This simplification also creates additional space to explore various resonant patterns on the top surface and the feeding network on the bottom surface of the TMA. Full-wave simulation results indicate that, despite the compact dimensions of the proposed array with 64 electrically small patch resonators (1.84位*1.84位*0.032位, where位is the free space wavelength at 6.0 GHz), it achieves a realized gain, HPBW of about 15.1 dBi and 28掳 respectively at 6 GHz. Finally, we constructed a prototype and conducted measurements to validate the design. Measured results demonstrate good agreement with simulation ones with a gain of about 13.5 (+-0.5) dBi and a HPBW of 27掳 at 6 GHz. The proposed TMA is scaled to fit within the required dimensions for smart handheld devices at higher frequencies, while maintaining high gain capability. The design s scalability, single-feed, and compact footprint make it optimal for diverse wireless communication systems, such as car to car communications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.02502v1-abstract-full').style.display = 'none'; document.getElementById('2412.02502v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.02407">arXiv:2412.02407</a> <span> [<a href="https://arxiv.org/pdf/2412.02407">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Dry Transfer Based on PMMA and Thermal Release Tape for Heterogeneous Integration of 2D-TMDC Layers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ghiami%2C+A">Amir Ghiami</a>, <a href="/search/physics?searchtype=author&query=Fiadziushkin%2C+H">Hleb Fiadziushkin</a>, <a href="/search/physics?searchtype=author&query=Sun%2C+T">Tianyishan Sun</a>, <a href="/search/physics?searchtype=author&query=Tang%2C+S">Songyao Tang</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+Y">Yibing Wang</a>, <a href="/search/physics?searchtype=author&query=Mayer%2C+E">Eva Mayer</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+J+M">Jochen M. Schneider</a>, <a href="/search/physics?searchtype=author&query=Piacentini%2C+A">Agata Piacentini</a>, <a href="/search/physics?searchtype=author&query=Lemme%2C+M+C">Max C. Lemme</a>, <a href="/search/physics?searchtype=author&query=Heuken%2C+M">Michael Heuken</a>, <a href="/search/physics?searchtype=author&query=Kalisch%2C+H">Holger Kalisch</a>, <a href="/search/physics?searchtype=author&query=Vescan%2C+A">Andrei Vescan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2412.02407v1-abstract-short" style="display: inline;"> A reliable and scalable transfer of 2D-TMDCs (two-dimensional transition metal dichalcogenides) from the growth substrate to a target substrate with high reproducibility and yield is a crucial step for device integration. In this work, we have introduced a scalable dry-transfer approach for 2D-TMDCs grown by MOCVD (metal-organic chemical vapor deposition) on sapphire. Transfer to a silicon/silicon… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.02407v1-abstract-full').style.display = 'inline'; document.getElementById('2412.02407v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.02407v1-abstract-full" style="display: none;"> A reliable and scalable transfer of 2D-TMDCs (two-dimensional transition metal dichalcogenides) from the growth substrate to a target substrate with high reproducibility and yield is a crucial step for device integration. In this work, we have introduced a scalable dry-transfer approach for 2D-TMDCs grown by MOCVD (metal-organic chemical vapor deposition) on sapphire. Transfer to a silicon/silicon dioxide (Si/SiO$_2$) substrate is performed using PMMA (poly(methyl methacrylate)) and TRT (thermal release tape) as sacrificial layer and carrier, respectively. Our proposed method ensures a reproducible peel-off from the growth substrate and better preservation of the 2D-TMDC during PMMA removal in solvent, without compromising its adhesion to the target substrate. A comprehensive comparison between the dry method introduced in this work and a standard wet transfer based on potassium hydroxide (KOH) solution shows improvement in terms of cleanliness and structural integrity for dry-transferred layer, as evidenced by X-ray photoemission and Raman spectroscopy, respectively. Moreover, fabricated field-effect transistors (FETs) demonstrate improvements in subthreshold slope, maximum drain current and device-to-device variability. The dry-transfer method developed in this work enables large-area integration of 2D-TMDC layers into (opto)electronic components with high reproducibility, while better preserving the as-grown properties of the layers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.02407v1-abstract-full').style.display = 'none'; document.getElementById('2412.02407v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">29 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.18106">arXiv:2411.18106</a> <span> [<a href="https://arxiv.org/pdf/2411.18106">pdf</a>, <a href="https://arxiv.org/format/2411.18106">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> </div> <p class="title is-5 mathjax"> Flame-wall interaction of thermodiffusively unstable hydrogen/air flames -- Part II: Parametric variations of equivalence ratio, temperature, and pressure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Max Schneider</a>, <a href="/search/physics?searchtype=author&query=Nicolai%2C+H">Hendrik Nicolai</a>, <a href="/search/physics?searchtype=author&query=Schuh%2C+V">Vinzenz Schuh</a>, <a href="/search/physics?searchtype=author&query=Steinhausen%2C+M">Matthias Steinhausen</a>, <a href="/search/physics?searchtype=author&query=Hasse%2C+C">Christian Hasse</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.18106v1-abstract-short" style="display: inline;"> Fuel-lean hydrogen combustion systems hold significant potential for low pollutant emissions, but are also susceptible to intrinsic combustion instabilities. While most research on these instabilities has focused on flames without wall confinement, practical combustors are typically enclosed by walls that strongly influence the combustion dynamics. In part I of this work, the flame-wall interactio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.18106v1-abstract-full').style.display = 'inline'; document.getElementById('2411.18106v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.18106v1-abstract-full" style="display: none;"> Fuel-lean hydrogen combustion systems hold significant potential for low pollutant emissions, but are also susceptible to intrinsic combustion instabilities. While most research on these instabilities has focused on flames without wall confinement, practical combustors are typically enclosed by walls that strongly influence the combustion dynamics. In part I of this work, the flame-wall interaction of intrinsically unstable hydrogen/air flames has been studied for a single operating condition through detailed numerical simulations in a two-dimensional head-on quenching configuration. This study extends the previous investigation to a wide range of gas turbine and engine-relevant operating conditions, including variations in equivalence ratio (0.4 - 1.0), unburnt gas temperature (298 K - 700 K), and pressure (1.01325 bar - 20 bar). These parametric variations allow for a detailed analysis and establish a baseline for modeling the effects of varying instability intensities on the quenching process, as the relative influence of thermodiffusive and hydrodynamic instabilities depends on the operating conditions. While the quenching characteristics remain largely unaffected by hydrodynamic instabilities, the presence of thermodiffusive instabilities significantly increases the mean wall-heat flux and reduces the mean quenching distance. Furthermore, the impact of thermodiffusive instabilities on the quenching process intensifies as their intensity increases, driven by an increase in pressures and a decrease in equivalence ratio and unburnt gas temperature. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.18106v1-abstract-full').style.display = 'none'; document.getElementById('2411.18106v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">submitted to Combustion and Flame</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.17590">arXiv:2411.17590</a> <span> [<a href="https://arxiv.org/pdf/2411.17590">pdf</a>, <a href="https://arxiv.org/format/2411.17590">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> </div> <p class="title is-5 mathjax"> Flame-wall interaction of thermodiffusively unstable hydrogen/air flames -- Part I: Characterization of governing physical phenomena </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Max Schneider</a>, <a href="/search/physics?searchtype=author&query=Nicolai%2C+H">Hendrik Nicolai</a>, <a href="/search/physics?searchtype=author&query=Schuh%2C+V">Vinzenz Schuh</a>, <a href="/search/physics?searchtype=author&query=Steinhausen%2C+M">Matthias Steinhausen</a>, <a href="/search/physics?searchtype=author&query=Hasse%2C+C">Christian Hasse</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.17590v1-abstract-short" style="display: inline;"> Hydrogen combustion systems operated under fuel-lean conditions offer great potential for low emissions. However, these operating conditions are also susceptible to intrinsic thermodiffusive combustion instabilities. Even though technical combustors are enclosed by walls that significantly influence the combustion process, intrinsic flame instabilities have mostly been investigated in canonical fr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.17590v1-abstract-full').style.display = 'inline'; document.getElementById('2411.17590v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.17590v1-abstract-full" style="display: none;"> Hydrogen combustion systems operated under fuel-lean conditions offer great potential for low emissions. However, these operating conditions are also susceptible to intrinsic thermodiffusive combustion instabilities. Even though technical combustors are enclosed by walls that significantly influence the combustion process, intrinsic flame instabilities have mostly been investigated in canonical freely-propagating flame configurations unconfined by walls. This study aims to close this gap by investigating the flame-wall interaction of thermodiffusive unstable hydrogen/air flame through detailed numerical simulations in a two-dimensional head-on quenching configuration. It presents an in-depth qualitative and quantitative analysis of the quenching process, revealing the major impact factors of the instabilities on the quenching characteristics. The thermodiffusive instabilities result in lower quenching distances and increased wall heat fluxes compared to one-dimensional head-on quenching flames under similar operation conditions. The change in quenching characteristics seems not to be driven by kinematic effects. Instead, the increased wall heat fluxes are caused by the enhanced flame reactivity of the unstable flame approaching the wall, which results from mixture variations associated with the instabilities. Overall, the study highlights the importance of studying flame-wall interaction in more complex domains than simple one-dimensional configurations, where such instabilities are inherently suppressed. Further, it emphasizes the need to incorporate local mixture variations induced by intrinsic combustion instabilities in combustion models for flame-wall interactions. In part II of this study, the scope is expanded to gas turbine and internal combustion engine relevant conditions through a parametric study, varying the equivalence ratio, pressure, and unburnt temperature. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.17590v1-abstract-full').style.display = 'none'; document.getElementById('2411.17590v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">submitted to Combustion and Flame</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.10320">arXiv:2411.10320</a> <span> [<a href="https://arxiv.org/pdf/2411.10320">pdf</a>, <a href="https://arxiv.org/format/2411.10320">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Dynamical Systems">math.DS</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chaotic Dynamics">nlin.CD</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Pattern Formation and Solitons">nlin.PS</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> </div> <p class="title is-5 mathjax"> Ghost states underlying spatial and temporal patterns: how non-existing invariant solutions control nonlinear dynamics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zheng%2C+Z">Zheng Zheng</a>, <a href="/search/physics?searchtype=author&query=Beck%2C+P">Pierre Beck</a>, <a href="/search/physics?searchtype=author&query=Yang%2C+T">Tian Yang</a>, <a href="/search/physics?searchtype=author&query=Ashtari%2C+O">Omid Ashtari</a>, <a href="/search/physics?searchtype=author&query=Parker%2C+J+P">Jeremy P Parker</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+T+M">Tobias M Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.10320v1-abstract-short" style="display: inline;"> Close to a saddle-node bifurcation, when two invariant solutions collide and disappear, the behavior of a dynamical system can closely resemble that of a solution which is no longer present at the chosen parameter value. For bifurcating equilibria in low-dimensional ODEs, the influence of such 'ghosts' on the temporal behavior of the system, namely delayed transitions, has been studied previously.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.10320v1-abstract-full').style.display = 'inline'; document.getElementById('2411.10320v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.10320v1-abstract-full" style="display: none;"> Close to a saddle-node bifurcation, when two invariant solutions collide and disappear, the behavior of a dynamical system can closely resemble that of a solution which is no longer present at the chosen parameter value. For bifurcating equilibria in low-dimensional ODEs, the influence of such 'ghosts' on the temporal behavior of the system, namely delayed transitions, has been studied previously. We consider spatio-temporal PDEs and characterize the phenomenon of ghosts by defining representative state-space structures, which we term 'ghost states,' as minima of appropriately chosen cost functions. Using recently developed variational methods, we can compute and parametrically continue ghost states of equilibria, periodic orbits, and other invariant solutions. We demonstrate the relevance of ghost states to the observed dynamics in various nonlinear systems including chaotic maps, the Lorenz ODE system, the spatio-temporally chaotic Kuramoto-Sivashinsky PDE, the buckling of an elastic arc, and 3D Rayleigh-B茅nard convection. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.10320v1-abstract-full').style.display = 'none'; document.getElementById('2411.10320v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.09270">arXiv:2411.09270</a> <span> [<a href="https://arxiv.org/pdf/2411.09270">pdf</a>, <a href="https://arxiv.org/format/2411.09270">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Integrated Data Analysis and Validation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fischer%2C+R">R. Fischer</a>, <a href="/search/physics?searchtype=author&query=Bock%2C+A">A. Bock</a>, <a href="/search/physics?searchtype=author&query=Denk%2C+S+S">S. S. Denk</a>, <a href="/search/physics?searchtype=author&query=Salewski%2C+A+M+M">A. Medvedeva. M. Salewski</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">M. Schneider</a>, <a href="/search/physics?searchtype=author&query=Stieglitz%2C+D">D. Stieglitz</a>, <a href="/search/physics?searchtype=author&query=Team%2C+A+U">ASDEX Upgrade Team</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.09270v1-abstract-short" style="display: inline;"> A major challenge in nuclear fusion research is the coherent combination of data from heterogeneous diagnostics and modelling codes for machine control and safety as well as physics studies. Measured data from different diagnostics often provide information about the same subset of physical parameters. Additionally, information provided by some diagnostics might be needed for the analysis of other… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.09270v1-abstract-full').style.display = 'inline'; document.getElementById('2411.09270v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.09270v1-abstract-full" style="display: none;"> A major challenge in nuclear fusion research is the coherent combination of data from heterogeneous diagnostics and modelling codes for machine control and safety as well as physics studies. Measured data from different diagnostics often provide information about the same subset of physical parameters. Additionally, information provided by some diagnostics might be needed for the analysis of other diagnostics. A joint analysis of complementary and redundant data allows, e.g., to improve the reliability of parameter estimation, to increase the spatial and temporal resolution of profiles, to obtain synergistic effects, to consider diagnostics interdependencies and to find and resolve data inconsistencies. Physics-based modelling and parameter relationships provide additional information improving the treatment of ill-posed inversion problems. A coherent combination of all kind of available information within a probabilistic framework allows for improved data analysis results. The concept of Integrated Data Analysis (IDA) in the framework of Bayesian probability theory is outlined and contrasted with conventional data analysis. Components of the probabilistic approach are summarized and specific ingredients beneficial for data analysis at fusion devices are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.09270v1-abstract-full').style.display = 'none'; document.getElementById('2411.09270v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.23185">arXiv:2410.23185</a> <span> [<a href="https://arxiv.org/pdf/2410.23185">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> In-situ Study of Understanding the Resistive Switching Mechanisms of Nitride-based Memristor Devices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zhang%2C+D">Di Zhang</a>, <a href="/search/physics?searchtype=author&query=Dhall%2C+R">Rohan Dhall</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M+M">Matthew M. Schneider</a>, <a href="/search/physics?searchtype=author&query=Song%2C+C">Chengyu Song</a>, <a href="/search/physics?searchtype=author&query=Dou%2C+H">Hongyi Dou</a>, <a href="/search/physics?searchtype=author&query=Kunwar%2C+S">Sundar Kunwar</a>, <a href="/search/physics?searchtype=author&query=Yazzie%2C+N+R">Natanii R. Yazzie</a>, <a href="/search/physics?searchtype=author&query=Ciston%2C+J">Jim Ciston</a>, <a href="/search/physics?searchtype=author&query=Cucciniello%2C+N+G">Nicholas G. Cucciniello</a>, <a href="/search/physics?searchtype=author&query=Roy%2C+P">Pinku Roy</a>, <a href="/search/physics?searchtype=author&query=Pettes%2C+M+T">Michael T. Pettes</a>, <a href="/search/physics?searchtype=author&query=Watt%2C+J">John Watt</a>, <a href="/search/physics?searchtype=author&query=Kuo%2C+W">Winson Kuo</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+H">Haiyan Wang</a>, <a href="/search/physics?searchtype=author&query=McCabe%2C+R+J">Rodney J. McCabe</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+A">Aiping Chen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.23185v1-abstract-short" style="display: inline;"> Interface-type resistive switching (RS) devices with lower operation current and more reliable switching repeatability exhibits great potential in the applications for data storage devices and ultra-low-energy computing. However, the working mechanism of such interface-type RS devices are much less studied compared to that of the filament-type devices, which hinders the design and application of t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.23185v1-abstract-full').style.display = 'inline'; document.getElementById('2410.23185v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.23185v1-abstract-full" style="display: none;"> Interface-type resistive switching (RS) devices with lower operation current and more reliable switching repeatability exhibits great potential in the applications for data storage devices and ultra-low-energy computing. However, the working mechanism of such interface-type RS devices are much less studied compared to that of the filament-type devices, which hinders the design and application of the novel interface-type devices. In this work, we fabricate a metal/TiOx/TiN/Si (001) thin film memristor by using a one-step pulsed laser deposition. In situ transmission electron microscopy (TEM) imaging and current-voltage (I-V) characteristic demonstrate that the device is switched between high resistive state (HRS) and low resistive state (LRS) in a bipolar fashion with sweeping the applied positive and negative voltages. In situ scanning transmission electron microscopy (STEM) experiments with electron energy loss spectroscopy (EELS) reveal that the charged defects (such as oxygen vacancies) can migrate along the intrinsic grain boundaries of TiOx insulating phase under electric field without forming obvious conductive filaments, resulting in the modulation of Schottky barriers at the metal/semiconductor interfaces. The fundamental insights gained from this study presents a novel perspective on RS processes and opens up new technological opportunities for fabricating ultra-low-energy nitride-based memristive devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.23185v1-abstract-full').style.display = 'none'; document.getElementById('2410.23185v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.05286">arXiv:2410.05286</a> <span> [<a href="https://arxiv.org/pdf/2410.05286">pdf</a>, <a href="https://arxiv.org/format/2410.05286">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Physics and Society">physics.soc-ph</span> </div> </div> <p class="title is-5 mathjax"> Dependent Infrastructure Service Disruption Mapping (DISruptionMap): A Method to Assess Cascading Service Disruptions in Disaster Scenarios </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Moritz Schneider</a>, <a href="/search/physics?searchtype=author&query=Halekotte%2C+L">Lukas Halekotte</a>, <a href="/search/physics?searchtype=author&query=Mentges%2C+A">Andrea Mentges</a>, <a href="/search/physics?searchtype=author&query=Fiedrich%2C+F">Frank Fiedrich</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.05286v1-abstract-short" style="display: inline;"> Critical infrastructures provide essential services for our modern society. Large-scale natural hazards, such as floods or storms, can disrupt multiple critical infrastructures at once. In addition, a localized failure of one service can trigger a cascade of failures of other dependent services. This makes it challenging to anticipate and prepare adequately for direct and indirect consequences of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.05286v1-abstract-full').style.display = 'inline'; document.getElementById('2410.05286v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.05286v1-abstract-full" style="display: none;"> Critical infrastructures provide essential services for our modern society. Large-scale natural hazards, such as floods or storms, can disrupt multiple critical infrastructures at once. In addition, a localized failure of one service can trigger a cascade of failures of other dependent services. This makes it challenging to anticipate and prepare adequately for direct and indirect consequences of such events. Existing methods that are spatially explicit and consider service dependencies currently lack practicality, as they require large amounts of data. To address this gap, we propose a novel method called DISruptionMap which analyzes complex disruptions to critical infrastructure services. The proposed method combines i) spatial service models to assess direct service disruptions with ii) a service dependency model to assess indirect (cascading) service disruptions. A fault tree-based approach is implemented, resulting in a significant decrease in the information required to set up the service dependency model. We demonstrate the effectiveness of our method in a case study examining the impact of an extreme flood on health, transport, and power services in Cologne, Germany. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.05286v1-abstract-full').style.display = 'none'; document.getElementById('2410.05286v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 10 Figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.00932">arXiv:2410.00932</a> <span> [<a href="https://arxiv.org/pdf/2410.00932">pdf</a>, <a href="https://arxiv.org/ps/2410.00932">ps</a>, <a href="https://arxiv.org/format/2410.00932">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="History and Philosophy of Physics">physics.hist-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> </div> <p class="title is-5 mathjax"> Spacetime emergence: an (in)effective story </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schneider%2C+M+D">Mike D. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.00932v1-abstract-short" style="display: inline;"> Physicists and philosophers are increasingly prone to regarding our current physical theories as providing 'effective descriptions' of real-world systems. In the context of quantum gravity research, this fuels a common view that the classical spacetime theory of general relativity provides effective descriptions where it is successfully applied. That common view of general relativity, in turn, enc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.00932v1-abstract-full').style.display = 'inline'; document.getElementById('2410.00932v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.00932v1-abstract-full" style="display: none;"> Physicists and philosophers are increasingly prone to regarding our current physical theories as providing 'effective descriptions' of real-world systems. In the context of quantum gravity research, this fuels a common view that the classical spacetime theory of general relativity provides effective descriptions where it is successfully applied. That common view of general relativity, in turn, encourages an 'effective' understanding of spacetime emergence. But descriptions of spacetime in general relativity irreducibly include global physical content, which is not effective. Recognizing this fact reigns in the interpretive scope of the common view of general relativity and specifically undermines our thinking about spacetime emergence effectively. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.00932v1-abstract-full').style.display = 'none'; document.getElementById('2410.00932v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted version, Philosophy of Physics</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.16996">arXiv:2409.16996</a> <span> [<a href="https://arxiv.org/pdf/2409.16996">pdf</a>, <a href="https://arxiv.org/format/2409.16996">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.22323/1.466.0024">10.22323/1.466.0024 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Parton Distribution Functions in the Schwinger Model with Tensor Networks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ba%C3%B1uls%2C+M+C">Mari Carmen Ba帽uls</a>, <a href="/search/physics?searchtype=author&query=Cichy%2C+K">Krzysztof Cichy</a>, <a href="/search/physics?searchtype=author&query=Lin%2C+C+-+D">C. -J. David Lin</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Manuel Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.16996v2-abstract-short" style="display: inline;"> Parton distribution functions (PDFs) describe universal properties of bound states and allow us to calculate scattering amplitudes in processes with large momentum transfer. Calculating PDFs involves the evaluation of matrix elements with a Wilson line in a light-cone direction. In contrast to Monte Carlo methods in Euclidean spacetime, these matrix elements can be directly calculated in Minkowski… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.16996v2-abstract-full').style.display = 'inline'; document.getElementById('2409.16996v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.16996v2-abstract-full" style="display: none;"> Parton distribution functions (PDFs) describe universal properties of bound states and allow us to calculate scattering amplitudes in processes with large momentum transfer. Calculating PDFs involves the evaluation of matrix elements with a Wilson line in a light-cone direction. In contrast to Monte Carlo methods in Euclidean spacetime, these matrix elements can be directly calculated in Minkowski-space using the Hamiltonian formalism. The necessary spatial- and time-evolution can be efficiently applied using established tensor network methods. We present PDFs in the Schwinger model calculated with matrix product states. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.16996v2-abstract-full').style.display = 'none'; document.getElementById('2409.16996v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 February, 2025; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proceedings of the 41st International Symposium on Lattice Field Theory, LATTICE2024, 28th July - 3rd August 2024, University of Liverpool, United Kingdom, Speaker: Manuel Schneider</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Proceedings of The 41st International Symposium on Lattice Field Theory -- PoS(LATTICE2024), volume 466, 024 (2025) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.13079">arXiv:2408.13079</a> <span> [<a href="https://arxiv.org/pdf/2408.13079">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Sub-wavelength localized all-optical helicity-independent magnetic switching using plasmonic gold nanostructures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sidiropoulos%2C+T">Themistoklis Sidiropoulos</a>, <a href="/search/physics?searchtype=author&query=Singh%2C+P">Puloma Singh</a>, <a href="/search/physics?searchtype=author&query=Noll%2C+T">Tino Noll</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Michael Schneider</a>, <a href="/search/physics?searchtype=author&query=Engel%2C+D">Dieter Engel</a>, <a href="/search/physics?searchtype=author&query=Sommer%2C+D">Denny Sommer</a>, <a href="/search/physics?searchtype=author&query=Steinbach%2C+F">Felix Steinbach</a>, <a href="/search/physics?searchtype=author&query=Will%2C+I">Ingo Will</a>, <a href="/search/physics?searchtype=author&query=Pfau%2C+B">Bastian Pfau</a>, <a href="/search/physics?searchtype=author&query=Schmising%2C+C+v+K">Clemens von Korff Schmising</a>, <a href="/search/physics?searchtype=author&query=Eisebitt%2C+S">Stefan Eisebitt</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.13079v1-abstract-short" style="display: inline;"> All-optical helicity-independent switching (AO-HIS) is of interest for ultrafast and energy efficient magnetic switching in future magnetic data storage approaches. Yet, to achieve high bit density magnetic recording it is necessary to reduce the size of the magnetic bits addressed by laser pulses at well-controlled positions. Metallic nanostructures that support localized surface plasmons enable… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.13079v1-abstract-full').style.display = 'inline'; document.getElementById('2408.13079v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.13079v1-abstract-full" style="display: none;"> All-optical helicity-independent switching (AO-HIS) is of interest for ultrafast and energy efficient magnetic switching in future magnetic data storage approaches. Yet, to achieve high bit density magnetic recording it is necessary to reduce the size of the magnetic bits addressed by laser pulses at well-controlled positions. Metallic nanostructures that support localized surface plasmons enable spatial electromagnetic confinement well below the diffraction limit and rare-earth transition metal alloys such as GdTbCo have demonstrated nanometre-sized stable domains. Here, we deposit plasmonic gold nanostructures on a GdTbCo film and probe the magnetic state using magnetic force microscopy. We observe localized AO-HIS down to a critical dimension of 240 nm after excitation of the gold nanostructures by a single 370 fs long laser pulse with a centre wavelength of 1030 nm. We demonstrate that the strong localization of optical fields through plasmonic nanostructures enables reproducible localized nanoscale AO-HIS at sub-wavelength length scales. We study the influence of the localized electromagnetic field enhancement by the plasmonic nanostructures on the required fluence to switch the magnetization. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.13079v1-abstract-full').style.display = 'none'; document.getElementById('2408.13079v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.04082">arXiv:2408.04082</a> <span> [<a href="https://arxiv.org/pdf/2408.04082">pdf</a>, <a href="https://arxiv.org/format/2408.04082">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3389/fphy.2024.1472759">10.3389/fphy.2024.1472759 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Design, Construction, and Test of Compact, Distributed-Charge, X-Band Accelerator Systems that Enable Image-Guided, VHEE FLASH Radiotherapy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Barty%2C+C+P+J">Christopher P. J. Barty</a>, <a href="/search/physics?searchtype=author&query=Algots%2C+J+M">J. Martin Algots</a>, <a href="/search/physics?searchtype=author&query=Amador%2C+A+J">Alexander J. Amador</a>, <a href="/search/physics?searchtype=author&query=Barty%2C+J+C+R">James C. R. Barty</a>, <a href="/search/physics?searchtype=author&query=Betts%2C+S+M">Shawn M. Betts</a>, <a href="/search/physics?searchtype=author&query=Casta%C3%B1eda%2C+M+A">Marcelo A. Casta帽eda</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+M+M">Matthew M. Chu</a>, <a href="/search/physics?searchtype=author&query=Daley%2C+M+E">Michael E. Daley</a>, <a href="/search/physics?searchtype=author&query=Lopez%2C+R+A+D+L">Ricardo A. De Luna Lopez</a>, <a href="/search/physics?searchtype=author&query=Diviak%2C+D+A">Derek A. Diviak</a>, <a href="/search/physics?searchtype=author&query=Effarah%2C+H+H">Haytham H. Effarah</a>, <a href="/search/physics?searchtype=author&query=Feliciano%2C+R">Roberto Feliciano</a>, <a href="/search/physics?searchtype=author&query=Garcia%2C+A">Adan Garcia</a>, <a href="/search/physics?searchtype=author&query=Grabiel%2C+K+J">Keith J. Grabiel</a>, <a href="/search/physics?searchtype=author&query=Griffin%2C+A+S">Alex S. Griffin</a>, <a href="/search/physics?searchtype=author&query=Hartemann%2C+F+V">Frederic V. Hartemann</a>, <a href="/search/physics?searchtype=author&query=Heid%2C+L">Leslie Heid</a>, <a href="/search/physics?searchtype=author&query=Hwang%2C+Y">Yoonwoo Hwang</a>, <a href="/search/physics?searchtype=author&query=Imeshev%2C+G">Gennady Imeshev</a>, <a href="/search/physics?searchtype=author&query=Jentschel%2C+M">Michael Jentschel</a>, <a href="/search/physics?searchtype=author&query=Johnson%2C+C+A">Christopher A. Johnson</a>, <a href="/search/physics?searchtype=author&query=Kinosian%2C+K+W">Kenneth W. Kinosian</a>, <a href="/search/physics?searchtype=author&query=Lagzda%2C+A">Agnese Lagzda</a>, <a href="/search/physics?searchtype=author&query=Lochrie%2C+R+J">Russell J. Lochrie</a>, <a href="/search/physics?searchtype=author&query=May%2C+M+W">Michael W. May</a> , et al. (18 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.04082v2-abstract-short" style="display: inline;"> The design and optimization of laser-Compton x-ray systems based on compact distributed charge accelerator structures can enable micron-scale imaging of disease and the concomitant production of beams of Very High Energy Electrons (VHEEs) capable of producing FLASH-relevant dose rates. The physics of laser-Compton x-ray scattering ensures that the scattered x-rays follow exactly the trajectory of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.04082v2-abstract-full').style.display = 'inline'; document.getElementById('2408.04082v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.04082v2-abstract-full" style="display: none;"> The design and optimization of laser-Compton x-ray systems based on compact distributed charge accelerator structures can enable micron-scale imaging of disease and the concomitant production of beams of Very High Energy Electrons (VHEEs) capable of producing FLASH-relevant dose rates. The physics of laser-Compton x-ray scattering ensures that the scattered x-rays follow exactly the trajectory of the incident electrons, thus providing a route to image-guided, VHEE FLASH radiotherapy. The keys to a compact architecture capable of producing both laser-Compton x-rays and VHEEs are the use of X-band RF accelerator structures which have been demonstrated to operate with over 100 MeV/m acceleration gradients. The operation of these structures in a distributed charge mode in which each radiofrequency (RF) cycle of the drive RF pulse is filled with a low-charge, high-brightness electron bunch is enabled by the illumination of a high-brightness photogun with a train of UV laser pulses synchronized to the frequency of the underlying accelerator system. The UV pulse trains are created by a patented pulse synthesis approach which utilizes the RF clock of the accelerator to phase and amplitude modulate a narrow band continuous wave (CW) seed laser. In this way it is possible to produce up to 10 $渭$A of average beam current from the accelerator. Such high current from a compact accelerator enables production of sufficient x-rays via laser-Compton scattering for clinical imaging and does so from a machine of "clinical" footprint. At the same time, the production of 1000 or greater individual micro-bunches per RF pulse enables > 10 nC of charge to be produced in a macrobunch of < 100 ns. The design, construction, and test of the 100-MeV class prototype system in Irvine, CA is also presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.04082v2-abstract-full').style.display = 'none'; document.getElementById('2408.04082v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted by Frontiers in Physics; Changes: expanded section 6, added numerical spectrum plot to Figure 10, expanded table 2 info, added citations; 29 pages, 13 figures, 2 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Front Phys 12:1472759 (2024) 1-18 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.14226">arXiv:2407.14226</a> <span> [<a href="https://arxiv.org/pdf/2407.14226">pdf</a>, <a href="https://arxiv.org/format/2407.14226">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.110.094501">10.1103/PhysRevD.110.094501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Initial tensor construction and dependence of the tensor renormalization group on initial tensors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Nakayama%2C+K">Katsumasa Nakayama</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Manuel Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.14226v2-abstract-short" style="display: inline;"> We propose a method to construct a tensor network representation of partition functions without singular value decompositions nor series expansions. The approach is demonstrated for one- and two-dimensional Ising models and we study the dependence of the tensor renormalization group (TRG) on the form of the initial tensors and their symmetries. We further introduce variants of several tensor renor… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.14226v2-abstract-full').style.display = 'inline'; document.getElementById('2407.14226v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.14226v2-abstract-full" style="display: none;"> We propose a method to construct a tensor network representation of partition functions without singular value decompositions nor series expansions. The approach is demonstrated for one- and two-dimensional Ising models and we study the dependence of the tensor renormalization group (TRG) on the form of the initial tensors and their symmetries. We further introduce variants of several tensor renormalization algorithms. Our benchmarks reveal a significant dependence of various TRG algorithms on the choice of initial tensors and their symmetries. However, we show that the boundary TRG technique can eliminate the initial tensor dependence for all TRG methods. The numerical results of TRG calculations can thus be made significantly more robust with only a few changes in the code. Furthermore, we study a three-dimensional $\mathbb{Z}_2$ gauge theory without gauge-fixing and confirm the applicability of the initial tensor construction. Our method can straightforwardly be applied to systems with longer range and multi-site interactions, such as the next-nearest neighbor Ising model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.14226v2-abstract-full').style.display = 'none'; document.getElementById('2407.14226v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 February, 2025; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 28 figures, 2 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 110, 094501 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.18285">arXiv:2405.18285</a> <span> [<a href="https://arxiv.org/pdf/2405.18285">pdf</a>, <a href="https://arxiv.org/ps/2405.18285">ps</a>, <a href="https://arxiv.org/format/2405.18285">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> </div> <p class="title is-5 mathjax"> A fully-implicit solving approach to an adaptive multi-scale model -- coupling a vertical-equilibrium and full-dimensional model for compressible, multi-phase flow in porous media </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Buntic%2C+I">Ivan Buntic</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Martin Schneider</a>, <a href="/search/physics?searchtype=author&query=Flemisch%2C+B">Bernd Flemisch</a>, <a href="/search/physics?searchtype=author&query=Helmig%2C+R">Rainer Helmig</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.18285v1-abstract-short" style="display: inline;"> Vertical equilibrium models have proven to be well suited for simulating fluid flow in subsurface porous media such as saline aquifers with caprocks. However, in most cases the dimensionally reduced model lacks the accuracy to capture the dynamics of a system. While conventional full-dimensional models have the ability to represent dynamics, they come at the cost of high computational effort. We a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.18285v1-abstract-full').style.display = 'inline'; document.getElementById('2405.18285v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.18285v1-abstract-full" style="display: none;"> Vertical equilibrium models have proven to be well suited for simulating fluid flow in subsurface porous media such as saline aquifers with caprocks. However, in most cases the dimensionally reduced model lacks the accuracy to capture the dynamics of a system. While conventional full-dimensional models have the ability to represent dynamics, they come at the cost of high computational effort. We aim to combine the efficiency of the vertical equilibrium model and the accuracy of the full-dimensional model by coupling the two models adaptively in a unified framework and solving the emerging system of equations in a monolithic, fully-implicit approach. The model domains are coupled via mass-conserving fluxes while the model adaptivity is ruled by adaption criteria. Overall, the adaptive model shows an excellent behaviour both in terms of accuracy as well as efficiency, especially for elongated geometries of storage systems with large aspect ratios. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.18285v1-abstract-full').style.display = 'none'; document.getElementById('2405.18285v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 12 figures, submitted to Computational Geosciences</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">MSC Class:</span> 76-10 (Primary) 76-04 (Secondary) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.10428">arXiv:2405.10428</a> <span> [<a href="https://arxiv.org/pdf/2405.10428">pdf</a>, <a href="https://arxiv.org/format/2405.10428">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Energetic particles transport in constants of motion space due to collisions in tokamak plasmas </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Meng%2C+G">Guo Meng</a>, <a href="/search/physics?searchtype=author&query=Lauber%2C+P">Philipp Lauber</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+Z">Zhixin Lu</a>, <a href="/search/physics?searchtype=author&query=Bergmann%2C+A">Andreas Bergmann</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Mirelle Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.10428v1-abstract-short" style="display: inline;"> The spatio-temporal evolution of the energetic particles in the transport time scale in tokamak plasmas is a key issue of the plasmas confinement, especially in burning plasmas. In order to include sources and sinks and collisional slowing down processes, a new solver, ATEP-3D was implemented to simulate the evolution of the EP distribution in the three-dimensional constants of motion (CoM) space.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.10428v1-abstract-full').style.display = 'inline'; document.getElementById('2405.10428v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.10428v1-abstract-full" style="display: none;"> The spatio-temporal evolution of the energetic particles in the transport time scale in tokamak plasmas is a key issue of the plasmas confinement, especially in burning plasmas. In order to include sources and sinks and collisional slowing down processes, a new solver, ATEP-3D was implemented to simulate the evolution of the EP distribution in the three-dimensional constants of motion (CoM) space. The Fokker-Planck collision operator represented in the CoM space is derived and numerically calculated. The collision coefficients are averaged over the unperturbed orbits to capture the fundamental properties of EPs. ATEP-3D is fully embedded in ITER IMAS framework and combined with the LIGKA/HAGIS codes. The finite volume method and the implicit Crank-Nicholson scheme are adopted due to their optimal numerical properties for transport time scale studies. ATEP-3D allows the analysis of the particle and power balance with the source and sink during the transport process to evaluate the EP confinement properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.10428v1-abstract-full').style.display = 'none'; document.getElementById('2405.10428v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 5 figures, 29th IAEA Fusion Energy Conf. 2023</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.19493">arXiv:2403.19493</a> <span> [<a href="https://arxiv.org/pdf/2403.19493">pdf</a>, <a href="https://arxiv.org/format/2403.19493">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chaotic Dynamics">nlin.CD</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Pattern Formation and Solitons">nlin.PS</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1017/jfm.2024.842">10.1017/jfm.2024.842 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Natural convection in a vertical channel. Part 1. Wavenumber interaction and Eckhaus instability in a narrow domain </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zheng%2C+Z">Zheng Zheng</a>, <a href="/search/physics?searchtype=author&query=Tuckerman%2C+L+S">Laurette S. Tuckerman</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+T+M">Tobias M. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.19493v2-abstract-short" style="display: inline;"> In a vertical channel driven by an imposed horizontal temperature gradient, numerical simulations have previously shown steady, time-periodic and chaotic dynamics. We explore the observed dynamics by constructing invariant solutions of the three-dimensional Oberbeck-Boussinesq equations, characterizing the stability of these equilibria and periodic orbits, and following the bifurcation structure o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.19493v2-abstract-full').style.display = 'inline'; document.getElementById('2403.19493v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.19493v2-abstract-full" style="display: none;"> In a vertical channel driven by an imposed horizontal temperature gradient, numerical simulations have previously shown steady, time-periodic and chaotic dynamics. We explore the observed dynamics by constructing invariant solutions of the three-dimensional Oberbeck-Boussinesq equations, characterizing the stability of these equilibria and periodic orbits, and following the bifurcation structure of the solution branches under parametric continuation in Rayleigh number. We find that in a narrow vertically-periodic domain of aspect ratio ten, the flow is dominated by the competition between three and four co-rotating rolls. We demonstrate that branches of three and four-roll equilibria are connected and can be understood in terms of their discrete symmetries. Specifically, the D4 symmetry of the four-roll branch dictates the existence of qualitatively different intermediate branches that themselves connect to the three-roll branch in a transcritical bifurcation due to D3 symmetry. The physical appearance, disappearance, merging and splitting of rolls along the connecting branch provide a physical and phenomenological illustration of the equivariant theory of D3-D4 mode interaction. We observe other manifestations of the competition between three and four rolls, in which the symmetry in time or in the transverse direction is broken, leading to limit cycles or wavy rolls, respectively. Our work highlights the interest of combining numerical simulations, bifurcation theory, and group theory, in order to understand the transitions between and origin of flow patterns. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.19493v2-abstract-full').style.display = 'none'; document.getElementById('2403.19493v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Fluid Mech. 1000 (2024) A28 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.18563">arXiv:2403.18563</a> <span> [<a href="https://arxiv.org/pdf/2403.18563">pdf</a>, <a href="https://arxiv.org/format/2403.18563">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chaotic Dynamics">nlin.CD</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Pattern Formation and Solitons">nlin.PS</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1017/jfm.2024.840">10.1017/jfm.2024.840 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Natural convection in a vertical channel. Part 2. Oblique solutions and global bifurcations in a spanwise-extended domain </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zheng%2C+Z">Zheng Zheng</a>, <a href="/search/physics?searchtype=author&query=Tuckerman%2C+L+S">Laurette S. Tuckerman</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+T+M">Tobias M. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.18563v2-abstract-short" style="display: inline;"> Vertical thermal convection is a non-equilibrium system in which both buoyancy and shear forces play a role in driving the convective flow. Beyond the onset of convection, the driven dissipative system exhibits chaotic dynamics and turbulence. In a three-dimensional domain extended in both the vertical and the transverse dimensions, Gao et al. (2018) have observed a variety of convection patterns… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.18563v2-abstract-full').style.display = 'inline'; document.getElementById('2403.18563v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.18563v2-abstract-full" style="display: none;"> Vertical thermal convection is a non-equilibrium system in which both buoyancy and shear forces play a role in driving the convective flow. Beyond the onset of convection, the driven dissipative system exhibits chaotic dynamics and turbulence. In a three-dimensional domain extended in both the vertical and the transverse dimensions, Gao et al. (2018) have observed a variety of convection patterns which are not described by linear stability analysis. We investigate the fully non-linear dynamics of vertical convection using a dynamical-systems approach based on the Oberbeck-Boussinesq equations. We compute the invariant solutions of these equations and the bifurcations that are responsible for the creation and termination of various branches. We map out a sequence of local bifurcations from the laminar base state, including simultaneous bifurcations involving patterned steady states with different symmetries. This atypical phenomenon of multiple branches simultaneously bifurcating from a single parent branch is explained by the role of D4 symmetry. In addition, two global bifurcations are identified: first, a homoclinic cycle from modulated transverse rolls and second, a heteroclinic cycle linking two symmetry-related diamond-roll patterns. These are confirmed by phase space projections as well as the functional form of the divergence of the period close to the bifurcation points. The heteroclinic orbit is shown to be robust and to result from a 1:2 mode interaction. The intricacy of this bifurcation diagram highlights the essential role played by dynamical systems theory and computation in hydrodynamic configurations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.18563v2-abstract-full').style.display = 'none'; document.getElementById('2403.18563v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Fluid Mech. 1000 (2024) A29 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.13971">arXiv:2403.13971</a> <span> [<a href="https://arxiv.org/pdf/2403.13971">pdf</a>, <a href="https://arxiv.org/format/2403.13971">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Adaptation and Self-Organizing Systems">nlin.AO</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chaotic Dynamics">nlin.CD</span> </div> </div> <p class="title is-5 mathjax"> Following marginal stability manifolds in quasilinear dynamical reductions of multiscale flows in two space dimensions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ferraro%2C+A">Alessia Ferraro</a>, <a href="/search/physics?searchtype=author&query=Chini%2C+G+P">Gregory P. Chini</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+T+M">Tobias M. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.13971v1-abstract-short" style="display: inline;"> A two-dimensional extension of a recently developed formalism for slow-fast quasilinear (QL) systems subject to fast instabilities is derived. Prior work has demonstrated that the emergent dynamics of these systems is characterized by a slow evolution of mean fields coupled to marginally stable, fast fluctuation fields. By exploiting this emergent behavior, an efficient fast-eigenvalue/slow-initia… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.13971v1-abstract-full').style.display = 'inline'; document.getElementById('2403.13971v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.13971v1-abstract-full" style="display: none;"> A two-dimensional extension of a recently developed formalism for slow-fast quasilinear (QL) systems subject to fast instabilities is derived. Prior work has demonstrated that the emergent dynamics of these systems is characterized by a slow evolution of mean fields coupled to marginally stable, fast fluctuation fields. By exploiting this emergent behavior, an efficient fast-eigenvalue/slow-initial-value solution algorithm can be developed in which the amplitude of the fast fluctuations is slaved to the slowly evolving mean fields to ensure marginal stability (and temporal scale separation) is maintained. For 2D systems that are spatially-extended in one direction, the fluctuation eigenfunctions are labeled by their wavenumbers characterizing spatial variability in that direction, and the marginal mode(s) also must coincide with the fastest-growing mode(s) over all admissible wavenumbers. Here, we introduce two equivalent procedures for deriving an ordinary differential equation governing the slow evolution of the wavenumber of the fastest-growing fluctuation mode that simultaneously must be slaved to the mean dynamics to ensure the mode has zero growth rate. We illustrate the procedure in the context of a 2D model partial differential equation that shares certain attributes with the equations governing strongly stratified shear flows. The slaved evolution follows one or more marginal stability manifolds, which constitute select state-space structures that are not invariant under the full flow dynamics yet capture quasi-coherent states in physical space in a manner analogous to invariant solutions identified in, e.g., transitionally-turbulent shear flows. Accordingly, we propose that marginal stability manifolds are central organizing structures in a dynamical systems description of certain classes of multiscale flows where scale separation justifies a QL approximation of the dynamics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.13971v1-abstract-full').style.display = 'none'; document.getElementById('2403.13971v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.03131">arXiv:2403.03131</a> <span> [<a href="https://arxiv.org/pdf/2403.03131">pdf</a>, <a href="https://arxiv.org/ps/2403.03131">ps</a>, <a href="https://arxiv.org/format/2403.03131">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Earth and Planetary Astrophysics">astro-ph.EP</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Space Physics">physics.space-ph</span> </div> </div> <p class="title is-5 mathjax"> Jovian sodium nebula and Io plasma torus S$^+$ and brightnesses 2017 -- 2023: insights into volcanic vs. sublimation supply </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Morgenthaler%2C+J+P">Jeffrey P. Morgenthaler</a>, <a href="/search/physics?searchtype=author&query=Schmidt%2C+C+A">Carl A. Schmidt</a>, <a href="/search/physics?searchtype=author&query=Vogt%2C+M+F">Marissa F. Vogt</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+N+M">Nicholas M. Schneider</a>, <a href="/search/physics?searchtype=author&query=Marconi%2C+M">Max Marconi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.03131v1-abstract-short" style="display: inline;"> We present first results derived from the largest collection of contemporaneously recorded Jovian sodium nebula and Io plasma torus (IPT) in [S II] 673.1 nm images assembled to date. The data were recorded by the Planetary Science Institute's Io Input/Output observatory (IoIO) and provide important context to Io geologic and atmospheric studies as well as the Juno mission and supporting observatio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.03131v1-abstract-full').style.display = 'inline'; document.getElementById('2403.03131v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.03131v1-abstract-full" style="display: none;"> We present first results derived from the largest collection of contemporaneously recorded Jovian sodium nebula and Io plasma torus (IPT) in [S II] 673.1 nm images assembled to date. The data were recorded by the Planetary Science Institute's Io Input/Output observatory (IoIO) and provide important context to Io geologic and atmospheric studies as well as the Juno mission and supporting observations. Enhancements in the observed emission are common, typically lasting 1 -- 3 months, such that the average flux of material from Io is determined by the enhancements, not any quiescent state. The enhancements are not seen at periodicities associated with modulation in solar insolation of Io's surface, thus physical process(es) other than insolation-driven sublimation must ultimately drive the bulk of Io's atmospheric escape. We suggest that geologic activity, likely involving volcanic plumes, drives escape. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.03131v1-abstract-full').style.display = 'none'; document.getElementById('2403.03131v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">29 pages, 4 figures, submitted to Journal of Geophysical Research (Space Physics)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.03797">arXiv:2402.03797</a> <span> [<a href="https://arxiv.org/pdf/2402.03797">pdf</a>, <a href="https://arxiv.org/ps/2402.03797">ps</a>, <a href="https://arxiv.org/format/2402.03797">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Saturation of fishbone instability through zonal flows driven by energetic particle transport in tokamak plasmas </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Brochard%2C+G">G. Brochard</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+C">C. Liu</a>, <a href="/search/physics?searchtype=author&query=Wei%2C+X">X. Wei</a>, <a href="/search/physics?searchtype=author&query=Heidbrink%2C+W">W. Heidbrink</a>, <a href="/search/physics?searchtype=author&query=Lin%2C+Z">Z. Lin</a>, <a href="/search/physics?searchtype=author&query=Falessi%2C+M+V">M. V. Falessi</a>, <a href="/search/physics?searchtype=author&query=Zonca%2C+F">F. Zonca</a>, <a href="/search/physics?searchtype=author&query=Qiu%2C+Z">Z. Qiu</a>, <a href="/search/physics?searchtype=author&query=Gorelenkov%2C+N">N. Gorelenkov</a>, <a href="/search/physics?searchtype=author&query=Chrystal%2C+C">C. Chrystal</a>, <a href="/search/physics?searchtype=author&query=Du%2C+X">X. Du</a>, <a href="/search/physics?searchtype=author&query=Bao%2C+J">J. Bao</a>, <a href="/search/physics?searchtype=author&query=Polevoi%2C+A+R">A. R. Polevoi</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">M. Schneider</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+H">S. H. Kim</a>, <a href="/search/physics?searchtype=author&query=Pinches%2C+S+D">S. D. Pinches</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+P">P. Liu</a>, <a href="/search/physics?searchtype=author&query=Nicolau%2C+J+H">J. H. Nicolau</a>, <a href="/search/physics?searchtype=author&query=L%C3%BCtjens%2C+H">H. L眉tjens</a>, <a href="/search/physics?searchtype=author&query=group%2C+t+I">the ISEP group</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.03797v1-abstract-short" style="display: inline;"> Gyrokinetic and kinetic-MHD simulations are performed for the fishbone instability in the DIII-D discharge #178631, chosen for validation of first-principles simulations to predict the energetic particle (EP) transport in an ITER prefusion baseline scenario. Fishbone modes are found to generate zonal flows, which dominate the fishbone saturation. The underlying mechanisms of the two-way fishbone-z… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.03797v1-abstract-full').style.display = 'inline'; document.getElementById('2402.03797v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.03797v1-abstract-full" style="display: none;"> Gyrokinetic and kinetic-MHD simulations are performed for the fishbone instability in the DIII-D discharge #178631, chosen for validation of first-principles simulations to predict the energetic particle (EP) transport in an ITER prefusion baseline scenario. Fishbone modes are found to generate zonal flows, which dominate the fishbone saturation. The underlying mechanisms of the two-way fishbone-zonal flows nonlinear interplay are discussed in details. Numerical and analytical analyses identify the fishbone-induced EP redistribution as the dominant generation mechanism for zonal flows. The zonal flows modify the nonlinear dynamics of phase space zonal structures, which reduces the amount of EPs able to resonate with the mode, leading to an early fishbone saturation. Simulation results including zonal flows agree quantitatively with DIII-D experimental measurements of the fishbone saturation amplitude and EP transport, supporting this novel saturation mechanism by self-generated zonal flows. Moreover, the wave-particle mode-locking mechanism is shown to determine quantitatively the fishbone frequency down-chirping, as evident in GTC simulation results in agreement with predictions from analytical theory. Finally, the fishbone-induced zonal flows are possibly responsible for the formation of an ion-ITB in the DIII-D discharge. Based on the low EP transport and the large zonal flow shearing rates associated with the fishbone instability in gyrokinetic simulations of the ITER scenario, it is conjectured that high performance scenarios could be designed in ITER burning plasmas through fishbone-induced ITBs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.03797v1-abstract-full').style.display = 'none'; document.getElementById('2402.03797v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.06464">arXiv:2401.06464</a> <span> [<a href="https://arxiv.org/pdf/2401.06464">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Earth and Planetary Astrophysics">astro-ph.EP</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Geophysics">physics.geo-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.epsl.2024.118567">10.1016/j.epsl.2024.118567 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Condensate evolution in the solar nebula inferred from combined Cr, Ti, and O isotope analyses of amoeboid olivine aggregates </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Jansen%2C+C+A">Christian A. Jansen</a>, <a href="/search/physics?searchtype=author&query=Burkhardt%2C+C">Christoph Burkhardt</a>, <a href="/search/physics?searchtype=author&query=Marrocchi%2C+Y">Yves Marrocchi</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+J+M">Jonas M. Schneider</a>, <a href="/search/physics?searchtype=author&query=W%C3%B6lfer%2C+E">Elias W枚lfer</a>, <a href="/search/physics?searchtype=author&query=Kleine%2C+T">Thorsten Kleine</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2401.06464v1-abstract-short" style="display: inline;"> Refractory inclusions in chondritic meteorites, namely amoeboid olivine aggregates (AOAs) and Ca-Al-rich inclusions (CAIs), are among the first solids to have formed in the solar system. The isotopic composition of CAIs is distinct from bulk meteorites, which either results from extreme processing of presolar carriers in the CAI-forming region, or reflects an inherited heterogeneity from the Sun's… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.06464v1-abstract-full').style.display = 'inline'; document.getElementById('2401.06464v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.06464v1-abstract-full" style="display: none;"> Refractory inclusions in chondritic meteorites, namely amoeboid olivine aggregates (AOAs) and Ca-Al-rich inclusions (CAIs), are among the first solids to have formed in the solar system. The isotopic composition of CAIs is distinct from bulk meteorites, which either results from extreme processing of presolar carriers in the CAI-forming region, or reflects an inherited heterogeneity from the Sun's parental molecular cloud. Amoeboid olivine aggregates are less refractory than CAIs and provide a record of how the isotopic composition of solid material in the disk may have changed in time and space. However, the isotopic composition of AOAs and how this composition relates to that of CAIs and later-formed solids is unknown. Here, using new O, Ti, and Cr isotopic data for eight AOAs from the Allende CV3 chondrite, we show that CAIs and AOAs share a common isotopic composition, indicating a close genetic link and formation from the same isotopic reservoir. Because AOAs are less refractory than CAIs, this observation is difficult to reconcile with a thermal processing origin of the isotope anomalies. Instead, the common isotopic composition of CAIs and AOAs is readily accounted for in a model in which the isotopic composition of infalling material from the Sun's parental molecular cloud changed over time. In this model, CAIs and AOAs record the isotopic composition of the early infall, while later-formed solids contain a larger fraction of the later, isotopically distinct infall. This model implies that CAIs and AOAs record the isotopic composition of the Sun and suggests that the nucleosynthetic isotope heterogeneity of the solar system is predominantly produced by mixing of solar nebula condensates, which acquired their distinct isotopic compositions as a result of time-varied infall from the protosolar cloud. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.06464v1-abstract-full').style.display = 'none'; document.getElementById('2401.06464v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Published gold open access in Earth and Planetary Science Letters</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Earth Planet. Sci. Lett. 627, 118567 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.14356">arXiv:2312.14356</a> <span> [<a href="https://arxiv.org/pdf/2312.14356">pdf</a>, <a href="https://arxiv.org/format/2312.14356">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Interactive simulation and visualization of point spread functions in single molecule imaging </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schneider%2C+M+C">Magdalena C. Schneider</a>, <a href="/search/physics?searchtype=author&query=Hinterer%2C+F">Fabian Hinterer</a>, <a href="/search/physics?searchtype=author&query=Jesacher%2C+A">Alexander Jesacher</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%BCtz%2C+G+J">Gerhard J. Sch眉tz</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.14356v1-abstract-short" style="display: inline;"> The point spread function (PSF) is fundamental to any type of microscopy, most importantly so for single-molecule localization techniques, where the exact PSF shape is crucial for precise molecule localization at the nanoscale. However, optical aberrations and fixed fluorophore dipoles can lead to non-isotropic and distorted PSFs, thereby complicating and biasing conventional fitting approaches. I… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.14356v1-abstract-full').style.display = 'inline'; document.getElementById('2312.14356v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.14356v1-abstract-full" style="display: none;"> The point spread function (PSF) is fundamental to any type of microscopy, most importantly so for single-molecule localization techniques, where the exact PSF shape is crucial for precise molecule localization at the nanoscale. However, optical aberrations and fixed fluorophore dipoles can lead to non-isotropic and distorted PSFs, thereby complicating and biasing conventional fitting approaches. In addition, some researchers deliberately modify the PSF by introducing specific phase shifts in order to provide improved sensitivity, e.g., for localizing molecules in 3D, or for determining the dipole orientation. For devising an experimental approach, but also for interpreting obtained data it would be helpful to have a simple visualization tool which calculates the expected PSF for the experiment in mind. To address this need, we have developed a comprehensive and accessible computer application that allows for the simulation of realistic PSFs based on the full vectorial PSF model. It incorporates a wide range of microscope and fluorophore parameters, enabling an accurate representation of various imaging conditions. Further, our app directly provides the Cramer-Rao bound for assessing the best achievable localization precision under given conditions. In addition to facilitating the simulation of PSFs of isotropic emitters, our application provides simulations of fixed dipole orientations as encountered, e.g., in cryogenic single-molecule localization microscopy applications. Moreover, it supports the incorporation of optical aberrations and phase manipulations for PSF engineering, as well as the simulation of crowded environments with overlapping molecules. Importantly, our software allows for the fitting of custom aberrations directly from experimental data, effectively bridging the gap between simulated and experimental scenarios, and enhancing experimental design and result validation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.14356v1-abstract-full').style.display = 'none'; document.getElementById('2312.14356v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.16688">arXiv:2311.16688</a> <span> [<a href="https://arxiv.org/pdf/2311.16688">pdf</a>, <a href="https://arxiv.org/format/2311.16688">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Coherent phonon-magnon interactions detected by micro-focused Brillouin light scattering spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kunz%2C+Y">Yannik Kunz</a>, <a href="/search/physics?searchtype=author&query=K%C3%BC%C3%9F%2C+M">Matthias K眉脽</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Michael Schneider</a>, <a href="/search/physics?searchtype=author&query=Geilen%2C+M">Moritz Geilen</a>, <a href="/search/physics?searchtype=author&query=Pirro%2C+P">Philipp Pirro</a>, <a href="/search/physics?searchtype=author&query=Albrecht%2C+M">Manfred Albrecht</a>, <a href="/search/physics?searchtype=author&query=Weiler%2C+M">Mathias Weiler</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.16688v1-abstract-short" style="display: inline;"> We investigated the interaction of surface acoustic waves and spin waves with spatial resolution by micro-focused Brillouin light scattering spectroscopy in a Co$_{40}$Fe$_{40}$B$_{20}$ ferromagnetic layer on a LiNbO$_{3}$-piezoelectric substrate. We experimentally demonstrate that the magnetoelastic excitation of magnons by phonons is coherent by studying the interfering BLS-signals of the phonon… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.16688v1-abstract-full').style.display = 'inline'; document.getElementById('2311.16688v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.16688v1-abstract-full" style="display: none;"> We investigated the interaction of surface acoustic waves and spin waves with spatial resolution by micro-focused Brillouin light scattering spectroscopy in a Co$_{40}$Fe$_{40}$B$_{20}$ ferromagnetic layer on a LiNbO$_{3}$-piezoelectric substrate. We experimentally demonstrate that the magnetoelastic excitation of magnons by phonons is coherent by studying the interfering BLS-signals of the phonons and magnons during their conversion process.We find a pronounced spatial dependence of the phonon annihilation and magnon excitation which we map as a function of the magnetic field. The coupling efficiency of the surface acoustic waves (SAWs) and the spin waves (SWs) is characterized by a magnetic field dependent decay of the SAWs amplitude. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.16688v1-abstract-full').style.display = 'none'; document.getElementById('2311.16688v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.13975">arXiv:2311.13975</a> <span> [<a href="https://arxiv.org/pdf/2311.13975">pdf</a>, <a href="https://arxiv.org/format/2311.13975">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Numerical Analysis">math.NA</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> </div> <p class="title is-5 mathjax"> Data-Driven Closure Parametrizations with Metrics: Dispersive Transport </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Coltman%2C+E">Edward Coltman</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Martin Schneider</a>, <a href="/search/physics?searchtype=author&query=Helmig%2C+R">Rainer Helmig</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.13975v2-abstract-short" style="display: inline;"> This work presents a data-driven framework for multi-scale parametrization of velocity-dependent dispersive transport in porous media. Pore-scale flow and transport simulations are conducted on periodic pore geometries, and volume-averaging is used to isolate dispersive transport, producing parameters for the dispersive closure term at the Representative Elementary Volume (REV) scale. After valida… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.13975v2-abstract-full').style.display = 'inline'; document.getElementById('2311.13975v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.13975v2-abstract-full" style="display: none;"> This work presents a data-driven framework for multi-scale parametrization of velocity-dependent dispersive transport in porous media. Pore-scale flow and transport simulations are conducted on periodic pore geometries, and volume-averaging is used to isolate dispersive transport, producing parameters for the dispersive closure term at the Representative Elementary Volume (REV) scale. After validation on unit cells with symmetric and asymmetric geometries, a convolutional neural network (CNN) is trained to predict dispersivity directly from pore-geometry images. Descriptive metrics are also introduced to better understand the parameter space and are used to build a neural network that predicts dispersivity based solely on these metrics. While the models predict longitudinal dispersivity well, transversal dispersivity remains difficult to capture, likely requiring more advanced models to fully describe pore-scale transversal dynamics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.13975v2-abstract-full').style.display = 'none'; document.getElementById('2311.13975v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.10904">arXiv:2311.10904</a> <span> [<a href="https://arxiv.org/pdf/2311.10904">pdf</a>, <a href="https://arxiv.org/format/2311.10904">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computer Vision and Pattern Recognition">cs.CV</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Closely-Spaced Object Classification Using MuyGPyS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pruett%2C+K">Kerianne Pruett</a>, <a href="/search/physics?searchtype=author&query=McNaughton%2C+N">Nathan McNaughton</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Michael Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.10904v1-abstract-short" style="display: inline;"> Accurately detecting rendezvous and proximity operations (RPO) is crucial for understanding how objects are behaving in the space domain. However, detecting closely-spaced objects (CSO) is challenging for ground-based optical space domain awareness (SDA) algorithms as two objects close together along the line-of-sight can appear blended as a single object within the point-spread function (PSF) of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.10904v1-abstract-full').style.display = 'inline'; document.getElementById('2311.10904v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.10904v1-abstract-full" style="display: none;"> Accurately detecting rendezvous and proximity operations (RPO) is crucial for understanding how objects are behaving in the space domain. However, detecting closely-spaced objects (CSO) is challenging for ground-based optical space domain awareness (SDA) algorithms as two objects close together along the line-of-sight can appear blended as a single object within the point-spread function (PSF) of the optical system. Traditional machine learning methods can be useful for differentiating between singular objects and closely-spaced objects, but many methods require large training sample sizes or high signal-to-noise conditions. The quality and quantity of realistic data make probabilistic classification methods a superior approach, as they are better suited to handle these data inadequacies. We present CSO classification results using the Gaussian process python package, MuyGPyS, and examine classification accuracy as a function of angular separation and magnitude difference between the simulated satellites. This orbit-independent analysis is done on highly accurate simulated SDA images that emulate realistic ground-based commercial-of-the-shelf (COTS) optical sensor observations of CSOs. We find that MuyGPyS outperforms traditional machine learning methods, especially under more challenging circumstances. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.10904v1-abstract-full').style.display = 'none'; document.getElementById('2311.10904v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted to the 2023 Advanced Maui Optical and Space Surveillance Technologies Conference (AMOS)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.03543">arXiv:2309.03543</a> <span> [<a href="https://arxiv.org/pdf/2309.03543">pdf</a>, <a href="https://arxiv.org/format/2309.03543">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Numerical Analysis">math.NA</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Engineering, Finance, and Science">cs.CE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> </div> <p class="title is-5 mathjax"> A new numerical mesoscopic scale one-domain approach solver for free fluid/porous medium interaction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Arico%2C+C">Costanza Arico</a>, <a href="/search/physics?searchtype=author&query=Helmig%2C+R">Rainer Helmig</a>, <a href="/search/physics?searchtype=author&query=Puleo%2C+D">Daniele Puleo</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Martin Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.03543v1-abstract-short" style="display: inline;"> A new numerical continuum \textit{one-domain} approach (ODA) solver is presented for the simulation of the transfer processes between a free fluid and a porous medium. The solver is developed in the \textit{mesoscopic} scale framework, where a continuous variation of the physical parameters of the porous medium (e.g., porosity and permeability) is assumed. The Navier-Stokes-Brinkman equations ar… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.03543v1-abstract-full').style.display = 'inline'; document.getElementById('2309.03543v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.03543v1-abstract-full" style="display: none;"> A new numerical continuum \textit{one-domain} approach (ODA) solver is presented for the simulation of the transfer processes between a free fluid and a porous medium. The solver is developed in the \textit{mesoscopic} scale framework, where a continuous variation of the physical parameters of the porous medium (e.g., porosity and permeability) is assumed. The Navier-Stokes-Brinkman equations are solved along with the continuity equation, under the hypothesis of incompressible fluid. The porous medium is assumed to be fully saturated and can potentially be anisotropic. The domain is discretized with unstructured meshes allowing local refinements. A fractional time step procedure is applied, where one predictor and two corrector steps are solved within each time iteration. The predictor step is solved in the framework of a marching in space and time procedure, with some important numerical advantages. The two corrector steps require the solution of large linear systems, whose matrices are sparse, symmetric and positive definite, with $\mathcal{M}$-matrix property over Delaunay-meshes. A fast and efficient solution is obtained using a preconditioned conjugate gradient method. The discretization adopted for the two corrector steps can be regarded as a Two-Point-Flux-Approximation (TPFA) scheme, which, unlike the standard TPFA schemes, does not require the grid mesh to be $\mathbf{K}$-orthogonal, (with $\mathbf{K}$ the anisotropy tensor). As demonstrated with the provided test cases, the proposed scheme correctly retains the anisotropy effects within the porous medium. Furthermore, it overcomes the restrictions of existing mesoscopic scale one-domain approachs proposed in the literature. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.03543v1-abstract-full').style.display = 'none'; document.getElementById('2309.03543v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.02219">arXiv:2307.02219</a> <span> [<a href="https://arxiv.org/pdf/2307.02219">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Earth and Planetary Astrophysics">astro-ph.EP</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Geophysics">physics.geo-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3847/2041-8213/ace187">10.3847/2041-8213/ace187 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Distribution of s-, r-, and p-process nuclides in the early Solar System inferred from Sr isotope anomalies in meteorites </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schneider%2C+J+M">Jonas M. Schneider</a>, <a href="/search/physics?searchtype=author&query=Burkhardt%2C+C">Christoph Burkhardt</a>, <a href="/search/physics?searchtype=author&query=Kleine%2C+T">Thorsten Kleine</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2307.02219v1-abstract-short" style="display: inline;"> Nucleosynthetic isotope anomalies in meteorites allow distinguishing between the non-carbonaceous (NC) and carbonaceous (CC) meteorite reservoirs and show that correlated isotope anomalies exist in both reservoirs. It is debated, however, whether these anomalies reflect thermal processing of presolar dust in the disk or are primordial heterogeneities inherited from the Solar System's parental mole… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.02219v1-abstract-full').style.display = 'inline'; document.getElementById('2307.02219v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.02219v1-abstract-full" style="display: none;"> Nucleosynthetic isotope anomalies in meteorites allow distinguishing between the non-carbonaceous (NC) and carbonaceous (CC) meteorite reservoirs and show that correlated isotope anomalies exist in both reservoirs. It is debated, however, whether these anomalies reflect thermal processing of presolar dust in the disk or are primordial heterogeneities inherited from the Solar System's parental molecular cloud. Here, using new high-precision 84Sr isotope data, we show that NC meteorites, Mars, and the Earth and Moon are characterized by the same 84Sr isotopic composition. This 84Sr homogeneity of the inner Solar System contrasts with the well-resolved and correlated isotope anomalies among NC meteorites observed for other elements, and most likely reflects correlated s- and (r-, p-)-process heterogeneities leading to 84Sr excess and deficits of similar magnitude which cancel each other. For the same reason there is no clearly resolved 84Sr difference between NC and CC meteorites, because in some carbonaceous chondrites the characteristic 84Sr excess of the CC reservoir is counterbalanced by an 84Sr deficit resulting from s-process variations. Nevertheless, most carbonaceous chondrites exhibit 84Sr excesses, which reflect admixture of refractory inclusions and more pronounced s-process heterogeneities in these samples. Together, the correlated variations of s-, (r-, p-)-process nuclides revealed by the 84Sr data of this study refute an origin of these isotope anomalies solely by processing of presolar dust grains, but points to primordial mixing of isotopically distinct dust reservoirs as the dominant process producing the isotopic heterogeneity of the Solar System. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.02219v1-abstract-full').style.display = 'none'; document.getElementById('2307.02219v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages 4 Figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.08442">arXiv:2306.08442</a> <span> [<a href="https://arxiv.org/pdf/2306.08442">pdf</a>, <a href="https://arxiv.org/format/2306.08442">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> EP-Stability-WF: an IMAS-integrated workflow for energetic particle stability </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Popa%2C+V+-">V. -A. Popa</a>, <a href="/search/physics?searchtype=author&query=Lauber%2C+P">Ph. Lauber</a>, <a href="/search/physics?searchtype=author&query=Hayward-Schneider%2C+T">T. Hayward-Schneider</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">M. Schneider</a>, <a href="/search/physics?searchtype=author&query=Hoenen%2C+O">O. Hoenen</a>, <a href="/search/physics?searchtype=author&query=Pinches%2C+S">S. Pinches</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.08442v1-abstract-short" style="display: inline;"> The confinement of energetic particles (EPs) generated by fusion reactions and external heating methods is crucial for the performance of future fusion devices. However, EP transport can occur due to their interaction with electromagnetic perturbations, affecting heating efficiency and overall performance. Robust reduced models are needed to analyze stability and transport, but their development r… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.08442v1-abstract-full').style.display = 'inline'; document.getElementById('2306.08442v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.08442v1-abstract-full" style="display: none;"> The confinement of energetic particles (EPs) generated by fusion reactions and external heating methods is crucial for the performance of future fusion devices. However, EP transport can occur due to their interaction with electromagnetic perturbations, affecting heating efficiency and overall performance. Robust reduced models are needed to analyze stability and transport, but their development requires effort. This paper presents an automated IMAS-based workflow for analyzing the time-dependent stability of EP-driven modes, focusing on the linear properties of Toroidal Alfven Eigenmodes (TAEs) in general Tokamak geometry. The workflow utilizes efficient computational methods and reduced models to deliver fast and reproducible results. A demonstration of the workflow's effectiveness was performed, identifying key linear properties of TAEs in various projected ITER scenarios. This approach represents a critical step towards developing tools for analyzing EP transport and optimizing the performance of future fusion reactors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.08442v1-abstract-full').style.display = 'none'; document.getElementById('2306.08442v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, submitted to NF 2023</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.00165">arXiv:2306.00165</a> <span> [<a href="https://arxiv.org/pdf/2306.00165">pdf</a>, <a href="https://arxiv.org/format/2306.00165">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Dynamical Systems">math.DS</span> </div> </div> <p class="title is-5 mathjax"> Identifying invariant solutions of wall-bounded three-dimensional shear flows using robust adjoint-based variational techniques </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ashtari%2C+O">Omid Ashtari</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+T+M">Tobias M. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.00165v2-abstract-short" style="display: inline;"> Invariant solutions of the Navier-Stokes equations play an important role in the spatiotemporally chaotic dynamics of turbulent shear flows. Despite the significance of these solutions, their identification remains a computational challenge, rendering many solutions inaccessible and thus hindering progress towards a dynamical description of turbulence in terms of invariant solutions. We compute eq… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.00165v2-abstract-full').style.display = 'inline'; document.getElementById('2306.00165v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.00165v2-abstract-full" style="display: none;"> Invariant solutions of the Navier-Stokes equations play an important role in the spatiotemporally chaotic dynamics of turbulent shear flows. Despite the significance of these solutions, their identification remains a computational challenge, rendering many solutions inaccessible and thus hindering progress towards a dynamical description of turbulence in terms of invariant solutions. We compute equilibria of three-dimensional wall-bounded shear flows using an adjoint-based matrix-free variational approach. To address the challenge of computing pressure in the presence of solid walls, we develop a formulation that circumvents the explicit construction of pressure and instead employs the influence matrix method. Together with a data-driven convergence acceleration technique based on dynamic mode decomposition, this yields a practically feasible alternative to state-of-the-art Newton methods for converging equilibrium solutions. We compute multiple equilibria of plane Couette flow starting from inaccurate guesses extracted from a turbulent time series. The variational method outperforms Newton(-hookstep) iterations in successfully converging from poor initial guesses, suggesting a larger convergence radius. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.00165v2-abstract-full').style.display = 'none'; document.getElementById('2306.00165v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.17459">arXiv:2305.17459</a> <span> [<a href="https://arxiv.org/pdf/2305.17459">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Large-area deposition of protective (Ti,Al)N coatings onto polycarbonate </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Patterer%2C+L">Lena Patterer</a>, <a href="/search/physics?searchtype=author&query=Kollmann%2C+S">Sabrina Kollmann</a>, <a href="/search/physics?searchtype=author&query=Arcos%2C+T+d+l">Teresa de los Arcos</a>, <a href="/search/physics?searchtype=author&query=Jende%2C+L">Leonie Jende</a>, <a href="/search/physics?searchtype=author&query=Aghda%2C+S+K">Soheil Karimi Aghda</a>, <a href="/search/physics?searchtype=author&query=Holzapfel%2C+D+M">Damian M. Holzapfel</a>, <a href="/search/physics?searchtype=author&query=Salman%2C+S+A">Sameer Aman Salman</a>, <a href="/search/physics?searchtype=author&query=Mr%C3%A1z%2C+S">Stanislav Mr谩z</a>, <a href="/search/physics?searchtype=author&query=Grundmeier%2C+G">Guido Grundmeier</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+J+M">Jochen M. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.17459v1-abstract-short" style="display: inline;"> Polycarbonate (PC) and protective (Ti,Al)N coatings exhibit extremely different material properties, specifically crystal structure, thermal stability, elastic and plastic behavior as well as thermal expansion coefficients. These differences present formidable challenges for the deposition process development as low-temperature synthesis routes have to be explored to avoid a thermal overload of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.17459v1-abstract-full').style.display = 'inline'; document.getElementById('2305.17459v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.17459v1-abstract-full" style="display: none;"> Polycarbonate (PC) and protective (Ti,Al)N coatings exhibit extremely different material properties, specifically crystal structure, thermal stability, elastic and plastic behavior as well as thermal expansion coefficients. These differences present formidable challenges for the deposition process development as low-temperature synthesis routes have to be explored to avoid a thermal overload of the polymer substrate. Here, a large-area sputtering process is developed to address the challenges by systematically adjusting target peak power density and duty cycle. Adhering (Ti,Al)N coatings with a critical residual tensile stress of 2.2 +/- 0.2 GPa are obtained in the pulsed direct current magnetron sputtering range, whereas depositions at higher target peak power densities, realized by high power pulsed magnetron sputtering, lead to stress-induced adhesive and/or cohesive failure. The stress-optimized (Ti,Al)N coatings deposited onto PC with a target peak power density of 0.036 kW cm-2 and a duty cycle of 5.3% were investigated by cross-cut test confirming adhesion. By investigating the bond formation at the PC | (Ti,Al)N interface, mostly interfacial CNx bonds and a small fraction of (C-O)-(Ti,Al) bonds are identified by X-ray photoelectron spectroscopy, indicating reactions at the hydrocarbon and the carbonate groups during deposition. Nanoindentation reveals an elastic modulus of 296 +/- 18 GPa for the (Ti,Al)N coating, while a Ti-Al-O layer is formed during electrochemical impedance spectroscopy in a borate buffer solution, indicating protective passivation. This work demonstrates that the challenge posed by the extremely different material properties at the interface of soft polymer substrates and hard coatings can be addressed by systematical variation of the pulsing parameters to reduce the residual film stress. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.17459v1-abstract-full').style.display = 'none'; document.getElementById('2305.17459v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.05470">arXiv:2305.05470</a> <span> [<a href="https://arxiv.org/pdf/2305.05470">pdf</a>, <a href="https://arxiv.org/format/2305.05470">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Active Personal Eye Lens Dosimetry with the Hybrid Pixelated Dosepix Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bei%C3%9Fer%2C+F">Florian Bei脽er</a>, <a href="/search/physics?searchtype=author&query=Haag%2C+D">Dennis Haag</a>, <a href="/search/physics?searchtype=author&query=Ballabriga%2C+R">Rafael Ballabriga</a>, <a href="/search/physics?searchtype=author&query=Behrens%2C+R">Rolf Behrens</a>, <a href="/search/physics?searchtype=author&query=Campbell%2C+M">Michael Campbell</a>, <a href="/search/physics?searchtype=author&query=Fuhg%2C+C">Christian Fuhg</a>, <a href="/search/physics?searchtype=author&query=Hufschmidt%2C+P">Patrick Hufschmidt</a>, <a href="/search/physics?searchtype=author&query=Hupe%2C+O">Oliver Hupe</a>, <a href="/search/physics?searchtype=author&query=Kupillas%2C+C">Carolin Kupillas</a>, <a href="/search/physics?searchtype=author&query=Llopart%2C+X">Xavier Llopart</a>, <a href="/search/physics?searchtype=author&query=Roth%2C+J">J眉rgen Roth</a>, <a href="/search/physics?searchtype=author&query=Schmidt%2C+S">Sebastian Schmidt</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Markus Schneider</a>, <a href="/search/physics?searchtype=author&query=Tlustos%2C+L">Lukas Tlustos</a>, <a href="/search/physics?searchtype=author&query=Wong%2C+W">Winnie Wong</a>, <a href="/search/physics?searchtype=author&query=Zutz%2C+H">Hayo Zutz</a>, <a href="/search/physics?searchtype=author&query=Michel%2C+T">Thilo Michel</a>, <a href="/search/physics?searchtype=author&query=Physics%2C+E+C+f+A">Erlangen Centre for Astroparticle Physics</a>, <a href="/search/physics?searchtype=author&query=CERN"> CERN</a>, <a href="/search/physics?searchtype=author&query=Bundesantalt%2C+P">Physikalisch-Technische Bundesantalt</a>, <a href="/search/physics?searchtype=author&query=Physics%2C+w+w+t+E+C+f+A">was with the Erlangen Centre for Astroparticle Physics</a>, <a href="/search/physics?searchtype=author&query=Helene-Lange-Gymnasium%2C+i+n+w">is now with Helene-Lange-Gymnasium</a>, <a href="/search/physics?searchtype=author&query=Physics%2C+w+w+t+E+C+f+A">was with the Erlangen Centre for Astroparticle Physics</a>, <a href="/search/physics?searchtype=author&query=CodeCamp%2C+i+n+w">is now with CodeCamp</a>, <a href="/search/physics?searchtype=author&query=%3A"> :</a> , et al. (6 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.05470v2-abstract-short" style="display: inline;"> Eye lens dosimetry has been an important field of research in the last decade. Dose measurements with a prototype of an active personal eye lens dosemeter based on the Dosepix detector are presented. The personal dose equivalent at $3\,$mm depth of soft tissue, $H_\text{p}(3)$, was measured in the center front of a water-filled cylinder phantom with a height and diameter of $20\,$cm. The energy de… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.05470v2-abstract-full').style.display = 'inline'; document.getElementById('2305.05470v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.05470v2-abstract-full" style="display: none;"> Eye lens dosimetry has been an important field of research in the last decade. Dose measurements with a prototype of an active personal eye lens dosemeter based on the Dosepix detector are presented. The personal dose equivalent at $3\,$mm depth of soft tissue, $H_\text{p}(3)$, was measured in the center front of a water-filled cylinder phantom with a height and diameter of $20\,$cm. The energy dependence of the normalized response is investigated for mean photon energies between $12.4\,$keV and $248\,$keV for continuous reference radiation fields (N-series) according to ISO 4037. The response normalized to N-60 ($\overline{E}=47.9\,\text{keV}$) at $0^\circ$ angle of irradiation stays within the approval limits of IEC 61526 for angles of incidence between $-75^\circ$ and $+75^\circ$. Performance in pulsed photon fields was tested for varying dose rates from $0.1\,\frac{\text{Sv}}{\text{h}}$ up to $1000\,\frac{\text{Sv}}{\text{h}}$ and pulse durations from $1\,\text{ms}$ up to $10\,\text{s}$. The dose measurement works well within the approval limits (acc. to IEC 61526) up to $1\,\frac{\text{Sv}}{\text{h}}$. No significant influence of the pulse duration on the measured dose is found. Reproducibility measurements yield a coefficient of variation which does not exceed $1\,\%$ for two tested eye lens dosemeter prototypes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.05470v2-abstract-full').style.display = 'none'; document.getElementById('2305.05470v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for possible publication. 9 pages, 10 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.02463">arXiv:2304.02463</a> <span> [<a href="https://arxiv.org/pdf/2304.02463">pdf</a>, <a href="https://arxiv.org/format/2304.02463">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="History and Philosophy of Physics">physics.hist-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Astrophysics of Galaxies">astro-ph.GA</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3390/galaxies11010032">10.3390/galaxies11010032 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Next Generation Event Horizon Telescope Collaboration: History, Philosophy, and Culture </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Galison%2C+P">Peter Galison</a>, <a href="/search/physics?searchtype=author&query=Doboszewski%2C+J">Juliusz Doboszewski</a>, <a href="/search/physics?searchtype=author&query=Elder%2C+J">Jamee Elder</a>, <a href="/search/physics?searchtype=author&query=Martens%2C+N+C+M">Niels C. M. Martens</a>, <a href="/search/physics?searchtype=author&query=Ashtekar%2C+A">Abhay Ashtekar</a>, <a href="/search/physics?searchtype=author&query=Enander%2C+J">Jonas Enander</a>, <a href="/search/physics?searchtype=author&query=Gueguen%2C+M">Marie Gueguen</a>, <a href="/search/physics?searchtype=author&query=Kessler%2C+E+A">Elizabeth A. Kessler</a>, <a href="/search/physics?searchtype=author&query=Lalli%2C+R">Roberto Lalli</a>, <a href="/search/physics?searchtype=author&query=Lesourd%2C+M">Martin Lesourd</a>, <a href="/search/physics?searchtype=author&query=Marcoci%2C+A">Alexandru Marcoci</a>, <a href="/search/physics?searchtype=author&query=Ram%C3%ADrez%2C+S+M">Sebasti谩n Murgueitio Ram铆rez</a>, <a href="/search/physics?searchtype=author&query=Natarajan%2C+P">Priyamvada Natarajan</a>, <a href="/search/physics?searchtype=author&query=Nguyen%2C+J">James Nguyen</a>, <a href="/search/physics?searchtype=author&query=Reyes-Galindo%2C+L">Luis Reyes-Galindo</a>, <a href="/search/physics?searchtype=author&query=Ritson%2C+S">Sophie Ritson</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M+D">Mike D. Schneider</a>, <a href="/search/physics?searchtype=author&query=Skulberg%2C+E">Emilie Skulberg</a>, <a href="/search/physics?searchtype=author&query=Sorgner%2C+H">Helene Sorgner</a>, <a href="/search/physics?searchtype=author&query=Stanley%2C+M">Matthew Stanley</a>, <a href="/search/physics?searchtype=author&query=Thresher%2C+A+C">Ann C. Thresher</a>, <a href="/search/physics?searchtype=author&query=Van+Dongen%2C+J">Jeroen Van Dongen</a>, <a href="/search/physics?searchtype=author&query=Weatherall%2C+J+O">James Owen Weatherall</a>, <a href="/search/physics?searchtype=author&query=Wu%2C+J">Jingyi Wu</a>, <a href="/search/physics?searchtype=author&query=W%C3%BCthrich%2C+A">Adrian W眉thrich</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2304.02463v1-abstract-short" style="display: inline;"> This white paper outlines the plans of the History Philosophy Culture Working Group of the Next Generation Event Horizon Telescope Collaboration. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.02463v1-abstract-full" style="display: none;"> This white paper outlines the plans of the History Philosophy Culture Working Group of the Next Generation Event Horizon Telescope Collaboration. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.02463v1-abstract-full').style.display = 'none'; document.getElementById('2304.02463v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 1 figure</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Galaxies 2023, 11, 32 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.18166">arXiv:2303.18166</a> <span> [<a href="https://arxiv.org/pdf/2303.18166">pdf</a>, <a href="https://arxiv.org/format/2303.18166">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Image and Video Processing">eess.IV</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> </div> </div> <p class="title is-5 mathjax"> Three-dimensional coherent diffraction snapshot imaging using extreme ultraviolet radiation from a free electron laser </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fainozzi%2C+D">Danny Fainozzi</a>, <a href="/search/physics?searchtype=author&query=Ippoliti%2C+M">Matteo Ippoliti</a>, <a href="/search/physics?searchtype=author&query=Bill%C3%A8%2C+F">Fulvio Bill猫</a>, <a href="/search/physics?searchtype=author&query=De+Angelis%2C+D">Dario De Angelis</a>, <a href="/search/physics?searchtype=author&query=Foglia%2C+L">Laura Foglia</a>, <a href="/search/physics?searchtype=author&query=Masciovecchio%2C+C">Claudio Masciovecchio</a>, <a href="/search/physics?searchtype=author&query=Mincigrucci%2C+R">Riccardo Mincigrucci</a>, <a href="/search/physics?searchtype=author&query=Pancaldi%2C+M">Matteo Pancaldi</a>, <a href="/search/physics?searchtype=author&query=Pedersoli%2C+E">Emanuele Pedersoli</a>, <a href="/search/physics?searchtype=author&query=Gunther%2C+C+M">Christian M. Gunther</a>, <a href="/search/physics?searchtype=author&query=Pfau%2C+B">Bastian Pfau</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Michael Schneider</a>, <a href="/search/physics?searchtype=author&query=Schmising%2C+C+V+K">Clemens Von Korff Schmising</a>, <a href="/search/physics?searchtype=author&query=Eisebitt%2C+S">Stefan Eisebitt</a>, <a href="/search/physics?searchtype=author&query=Kourousias%2C+G">George Kourousias</a>, <a href="/search/physics?searchtype=author&query=Bencivenga%2C+F">Filippo Bencivenga</a>, <a href="/search/physics?searchtype=author&query=Capotondi%2C+F">Flavio Capotondi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.18166v2-abstract-short" style="display: inline;"> The possibility to obtain a three-dimensional representation of a single object with sub-$渭$m resolution is crucial in many fields, from material science to clinical diagnostics. This is typically achieved through tomography, which combines multiple two-dimensional images of the same object captured at different orientations. However, this serial imaging method prevents single-shot acquisition in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.18166v2-abstract-full').style.display = 'inline'; document.getElementById('2303.18166v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.18166v2-abstract-full" style="display: none;"> The possibility to obtain a three-dimensional representation of a single object with sub-$渭$m resolution is crucial in many fields, from material science to clinical diagnostics. This is typically achieved through tomography, which combines multiple two-dimensional images of the same object captured at different orientations. However, this serial imaging method prevents single-shot acquisition in imaging experiments at free electron lasers. In the present experiment, we report on a new approach to 3D imaging using extreme-ultraviolet radiation. In this method, two EUV pulses hit simultaneously an isolated 3D object from different sides, generating independent coherent diffraction patterns, resulting in two distinct bidimensional views obtained via phase retrieval. These views are then used to obtain a 3D reconstruction using a ray tracing algorithm. This EUV stereoscopic imaging approach, similar to the natural process of binocular vision, provides sub-$渭$m spatial resolution and single shot capability. Moreover, ultrafast time resolution and spectroscopy can be readily implemented, a further extension to X-ray wavelengths can be envisioned as well. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.18166v2-abstract-full').style.display = 'none'; document.getElementById('2303.18166v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Authors Danny Fainozzi and Matteo Ippoliti contributed equally</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.14974">arXiv:2303.14974</a> <span> [<a href="https://arxiv.org/pdf/2303.14974">pdf</a>, <a href="https://arxiv.org/ps/2303.14974">ps</a>, <a href="https://arxiv.org/format/2303.14974">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="History and Philosophy of Physics">physics.hist-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> </div> <p class="title is-5 mathjax"> Empty space and the (positive) cosmological constant </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schneider%2C+M+D">Mike D. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.14974v1-abstract-short" style="display: inline;"> I discuss empty space, as it appears in the physical foundations of relativistic field theories and in the semiclassical study of isolated systems. Of particular interest is the relationship between empirical measurements of the cosmological constant and the question of appropriate representation of empty space by spacetimes, or models of general relativity. Also considered is a speculative move t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.14974v1-abstract-full').style.display = 'inline'; document.getElementById('2303.14974v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.14974v1-abstract-full" style="display: none;"> I discuss empty space, as it appears in the physical foundations of relativistic field theories and in the semiclassical study of isolated systems. Of particular interest is the relationship between empirical measurements of the cosmological constant and the question of appropriate representation of empty space by spacetimes, or models of general relativity. Also considered is a speculative move that shows up in one corner of quantum gravity research. In pursuit of holographic quantum cosmology given a positive cosmological constant, there is evidently some freedom available for theoretical physicists to pick between two physically inequivalent spacetime representations of empty space, moving forward: de Sitter spacetime or its 'elliptic' cousin. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.14974v1-abstract-full').style.display = 'none'; document.getElementById('2303.14974v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Final pre-print version</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.12775">arXiv:2303.12775</a> <span> [<a href="https://arxiv.org/pdf/2303.12775">pdf</a>, <a href="https://arxiv.org/format/2303.12775">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Biomolecules">q-bio.BM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</span> </div> </div> <p class="title is-5 mathjax"> System-specific parameter optimization for non-polarizable and polarizable force fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hu%2C+X">Xiaojuan Hu</a>, <a href="/search/physics?searchtype=author&query=Amin%2C+K+S">Kazi S. Amin</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Markus Schneider</a>, <a href="/search/physics?searchtype=author&query=Lim%2C+C">Carmay Lim</a>, <a href="/search/physics?searchtype=author&query=Salahub%2C+D">Dennis Salahub</a>, <a href="/search/physics?searchtype=author&query=Baldauf%2C+C">Carsten Baldauf</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.12775v2-abstract-short" style="display: inline;"> The accuracy of classical force fields (FFs) has been shown to be limited for the simulation of cation-protein systems despite their importance in understanding the processes of life. Improvements can result from optimizing the parameters of classical FFs or by extending the FF formulation by terms describing charge transfer and polarization effects. In this work, we introduce our implementation o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.12775v2-abstract-full').style.display = 'inline'; document.getElementById('2303.12775v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.12775v2-abstract-full" style="display: none;"> The accuracy of classical force fields (FFs) has been shown to be limited for the simulation of cation-protein systems despite their importance in understanding the processes of life. Improvements can result from optimizing the parameters of classical FFs or by extending the FF formulation by terms describing charge transfer and polarization effects. In this work, we introduce our implementation of the CTPOL model in OpenMM, which extends the classical additive FF formula by adding charge transfer (CT) and polarization (POL). Furthermore, we present an open-source parameterization tool, called FFAFFURR that enables the (system specific) parameterization of OPLS-AA and CTPOL models. The performance of our workflow was evaluated by its ability to reproduce quantum chemistry energies and by molecular dynamics simulations of a Zinc finger protein. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.12775v2-abstract-full').style.display = 'none'; document.getElementById('2303.12775v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">62 pages and 25 figures (including SI), manuscript to be submitted soon</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.04173">arXiv:2303.04173</a> <span> [<a href="https://arxiv.org/pdf/2303.04173">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Earth and Planetary Astrophysics">astro-ph.EP</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Geophysics">physics.geo-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3847/2041-8213/acc102">10.3847/2041-8213/acc102 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Origin of isotopic diversity among carbonaceous chondrites </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hellmann%2C+J+L">Jan L. Hellmann</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+J+M">Jonas M. Schneider</a>, <a href="/search/physics?searchtype=author&query=W%C3%B6lfer%2C+E">Elias W枚lfer</a>, <a href="/search/physics?searchtype=author&query=Dr%C4%85%C5%BCkowska%2C+J">Joanna Dr膮偶kowska</a>, <a href="/search/physics?searchtype=author&query=Jansen%2C+C+A">Christian A. Jansen</a>, <a href="/search/physics?searchtype=author&query=Hopp%2C+T">Timo Hopp</a>, <a href="/search/physics?searchtype=author&query=Burkhardt%2C+C">Christoph Burkhardt</a>, <a href="/search/physics?searchtype=author&query=Kleine%2C+T">Thorsten Kleine</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.04173v1-abstract-short" style="display: inline;"> Carbonaceous chondrites are some of the most primitive meteorites and derive from planetesimals that formed a few million years after the beginning of the solar system. Here, using new and previously published Cr, Ti, and Te isotopic data, we show that carbonaceous chondrites exhibit correlated isotopic variations that can be accounted for by mixing among three major constituents having distinct i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.04173v1-abstract-full').style.display = 'inline'; document.getElementById('2303.04173v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.04173v1-abstract-full" style="display: none;"> Carbonaceous chondrites are some of the most primitive meteorites and derive from planetesimals that formed a few million years after the beginning of the solar system. Here, using new and previously published Cr, Ti, and Te isotopic data, we show that carbonaceous chondrites exhibit correlated isotopic variations that can be accounted for by mixing among three major constituents having distinct isotopic compositions, namely refractory inclusions, chondrules, and CI chondrite-like matrix. The abundances of refractory inclusions and chondrules are coupled and systematically decrease with increasing amount of matrix. We propose that these correlated abundance variations reflect trapping of chondrule precursors, including refractory inclusions, in a pressure maximum in the disk, which is likely related to the water ice line and the ultimate formation location of Jupiter. The variable abundance of refractory inclusions/chondrules relative to matrix is the result of their distinct aerodynamical properties resulting in differential delivery rates and their preferential incorporation into chondrite parent bodies during the streaming instability, consistent with the early formation of matrix-poor and the later accretion of matrix-rich carbonaceous chondrites. Our results suggest that chondrules formed locally from isotopically heterogeneous dust aggregates which themselves derive from a wide area of the disk, implying that dust enrichment in a pressure trap was an important step to facilitate the accretion of carbonaceous chondrite parent bodies or, more generally, planetesimals in the outer solar system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.04173v1-abstract-full').style.display = 'none'; document.getElementById('2303.04173v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 4 figures, 1 table. Accepted for publication in ApJL</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.04524">arXiv:2302.04524</a> <span> [<a href="https://arxiv.org/pdf/2302.04524">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Physics and Society">physics.soc-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.ijdrr.2023.103893">10.1016/j.ijdrr.2023.103893 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A resilience glossary shaped by context: Reviewing resilience-related terms for critical infrastructures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mentges%2C+A">Andrea Mentges</a>, <a href="/search/physics?searchtype=author&query=Halekotte%2C+L">Lukas Halekotte</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Moritz Schneider</a>, <a href="/search/physics?searchtype=author&query=Demmer%2C+T">Tobias Demmer</a>, <a href="/search/physics?searchtype=author&query=Lichte%2C+D">Daniel Lichte</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2302.04524v1-abstract-short" style="display: inline;"> We present a comprehensive resilience glossary, comprising a set of 91 definitions of resilience-related terms used in the context of critical infrastructures. The definition and use of many of these terms, as well as the term resilience itself, shows an enormous variability in the literature. Therefore, we draw from the diverse pool of published definitions, integrate multiple contrasting views,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.04524v1-abstract-full').style.display = 'inline'; document.getElementById('2302.04524v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.04524v1-abstract-full" style="display: none;"> We present a comprehensive resilience glossary, comprising a set of 91 definitions of resilience-related terms used in the context of critical infrastructures. The definition and use of many of these terms, as well as the term resilience itself, shows an enormous variability in the literature. Therefore, we draw from the diverse pool of published definitions, integrate multiple contrasting views, compare the individual terms, and provide references to adjoining or contesting views, to create a clear resilience terminology. This terminology outlines a specific understanding of resilience which supports the effective assessment and management of the resilience of critical infrastructures. The two central elements of this understanding are that (1) resilience is the ability of a system to deal with the impacts of unspecific and possibly unforeseen disruptive events, and that (2) this ability comprises three pillar capacities whose quality can be extracted from performance curves. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.04524v1-abstract-full').style.display = 'none'; document.getElementById('2302.04524v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">55 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.11704">arXiv:2301.11704</a> <span> [<a href="https://arxiv.org/pdf/2301.11704">pdf</a>, <a href="https://arxiv.org/format/2301.11704">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chaotic Dynamics">nlin.CD</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0143923">10.1063/5.0143923 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Jacobian-Free Variational Method for Constructing Connecting Orbits in Nonlinear Dynamical Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ashtari%2C+O">Omid Ashtari</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+T+M">Tobias M. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.11704v1-abstract-short" style="display: inline;"> In a dynamical systems description of spatiotemporally chaotic PDEs including those describing turbulence, chaos is viewed as a trajectory evolving within a network of non-chaotic, dynamically unstable, time-invariant solutions embedded in the chaotic attractor of the system. While equilibria, periodic orbits and invariant tori can be constructed using existing methods, computations of heteroclini… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.11704v1-abstract-full').style.display = 'inline'; document.getElementById('2301.11704v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.11704v1-abstract-full" style="display: none;"> In a dynamical systems description of spatiotemporally chaotic PDEs including those describing turbulence, chaos is viewed as a trajectory evolving within a network of non-chaotic, dynamically unstable, time-invariant solutions embedded in the chaotic attractor of the system. While equilibria, periodic orbits and invariant tori can be constructed using existing methods, computations of heteroclinic and homoclinic connections mediating the evolution between the former invariant solutions remain challenging. We propose a robust matrix-free variational method for computing connecting orbits between equilibrium solutions of a dynamical system that can be applied to high-dimensional problems. Instead of a common shooting-based approach, we define a minimization problem in the space of smooth state space curves that connect the two equilibria with a cost function measuring the deviation of a connecting curve from an integral curve of the vector field. Minimization deforms a trial curve until, at a global minimum, a connecting orbit is obtained. The method is robust, has no limitation on the dimension of the unstable manifold at the origin equilibrium, and does not suffer from exponential error amplification associated with time-marching a chaotic system. Owing to adjoint-based minimization techniques, no Jacobian matrices need to be constructed and the memory requirement scales linearly with the size of the problem. The robustness of the method is demonstrated for the one-dimensional Kuramoto-Sivashinsky equation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.11704v1-abstract-full').style.display = 'none'; document.getElementById('2301.11704v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.10626">arXiv:2301.10626</a> <span> [<a href="https://arxiv.org/pdf/2301.10626">pdf</a>, <a href="https://arxiv.org/format/2301.10626">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chaotic Dynamics">nlin.CD</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0143689">10.1063/5.0143689 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Predicting chaotic statistics with unstable invariant tori </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Parker%2C+J+P">Jeremy P. Parker</a>, <a href="/search/physics?searchtype=author&query=Ashtari%2C+O">Omid Ashtari</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+T+M">Tobias M. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.10626v1-abstract-short" style="display: inline;"> It has recently been speculated that statistical properties of chaos may be captured by weighted sums over unstable invariant tori embedded in the chaotic attractor of hyperchaotic dissipative systems; analogous to sums over periodic orbits formalized within periodic orbit theory. Using a novel numerical method for converging unstable invariant 2-tori in a chaotic PDE, we identify many quasiperiod… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.10626v1-abstract-full').style.display = 'inline'; document.getElementById('2301.10626v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.10626v1-abstract-full" style="display: none;"> It has recently been speculated that statistical properties of chaos may be captured by weighted sums over unstable invariant tori embedded in the chaotic attractor of hyperchaotic dissipative systems; analogous to sums over periodic orbits formalized within periodic orbit theory. Using a novel numerical method for converging unstable invariant 2-tori in a chaotic PDE, we identify many quasiperiodic, unstable, invariant 2-torus solutions of a modified Kuramoto-Sivashinsky equation exhibiting hyperchaotic dynamics with two positive Lyapunov exponents. The set of tori covers significant parts of the chaotic attractor and weighted averages of the properties of the tori -- with weights computed based on their respective stability eigenvalues -- approximate statistics for the chaotic dynamics. These results are a step towards including higher-dimensional invariant sets in a generalized periodic orbit theory for hyperchaotic systems including spatio-temporally chaotic PDEs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.10626v1-abstract-full').style.display = 'none'; document.getElementById('2301.10626v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.04927">arXiv:2301.04927</a> <span> [<a href="https://arxiv.org/pdf/2301.04927">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/18/01/C01069">10.1088/1748-0221/18/01/C01069 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Planar fiber-chip-coupling using angle-polished polarization maintaining fibers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Marc Schneider</a>, <a href="/search/physics?searchtype=author&query=Herrera%2C+L+A+G">Luis Alberto Garcia Herrera</a>, <a href="/search/physics?searchtype=author&query=Burger%2C+B">Birgit Burger</a>, <a href="/search/physics?searchtype=author&query=Eisenbl%C3%A4tter%2C+L">Lars Eisenbl盲tter</a>, <a href="/search/physics?searchtype=author&query=K%C3%BChner%2C+T">Thomas K眉hner</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.04927v1-abstract-short" style="display: inline;"> We report on our latest developments of a planar fiber-chip-coupling scheme, using angle polished, polarization maintaining (PM) fibers. Most integrated photonic chip components are polarization sensitive and a suitable way to launch several wavelength channels with the same polarization to the chip is the use of PM fibers. Those impose several challenges at processing and handling to achieve a st… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.04927v1-abstract-full').style.display = 'inline'; document.getElementById('2301.04927v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.04927v1-abstract-full" style="display: none;"> We report on our latest developments of a planar fiber-chip-coupling scheme, using angle polished, polarization maintaining (PM) fibers. Most integrated photonic chip components are polarization sensitive and a suitable way to launch several wavelength channels with the same polarization to the chip is the use of PM fibers. Those impose several challenges at processing and handling to achieve a stable, permanent, and low-loss coupling. We present the processing of the fibers in detail and experimental results for our planar and compact fiber-chip-coupling technique. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.04927v1-abstract-full').style.display = 'none'; document.getElementById('2301.04927v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 8 figures, conference paper for TWEPP2022, submitted to and reviewed by Journal of Instrumentation (JINST), to be typeset and published in JINST</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.01792">arXiv:2301.01792</a> <span> [<a href="https://arxiv.org/pdf/2301.01792">pdf</a>, <a href="https://arxiv.org/format/2301.01792">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Saturation of fishbone instability by self-generated zonal flows in tokamak plasmas </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Brochard%2C+G">G. Brochard</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+C">C. Liu</a>, <a href="/search/physics?searchtype=author&query=Wei%2C+X">X. Wei</a>, <a href="/search/physics?searchtype=author&query=Heidbrink%2C+W">W. Heidbrink</a>, <a href="/search/physics?searchtype=author&query=Lin%2C+Z">Z. Lin</a>, <a href="/search/physics?searchtype=author&query=Gorelenkov%2C+N">N. Gorelenkov</a>, <a href="/search/physics?searchtype=author&query=Chrystal%2C+C">C. Chrystal</a>, <a href="/search/physics?searchtype=author&query=Du%2C+X">X. Du</a>, <a href="/search/physics?searchtype=author&query=Bao%2C+J">J. Bao</a>, <a href="/search/physics?searchtype=author&query=Polevoi%2C+A+R">A. R. Polevoi</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">M. Schneider</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+H">S. H. Kim</a>, <a href="/search/physics?searchtype=author&query=Pinches%2C+S+D">S. D. Pinches</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+P">P. Liu</a>, <a href="/search/physics?searchtype=author&query=Nicolau%2C+J+H">J. H. Nicolau</a>, <a href="/search/physics?searchtype=author&query=L%C3%BCtjens%2C+H">H. L眉tjens</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.01792v4-abstract-short" style="display: inline;"> Gyrokinetic simulations of the fishbone instability in DIII-D tokamak plasmas find that self-generated zonal flows can dominate the nonlinear saturation by preventing coherent structures from persisting or drifting in the energetic particle phase space when the mode frequency down-chirps. Results from the simulation with zonal flows agree quantitatively, for the first time, with experimental measu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.01792v4-abstract-full').style.display = 'inline'; document.getElementById('2301.01792v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.01792v4-abstract-full" style="display: none;"> Gyrokinetic simulations of the fishbone instability in DIII-D tokamak plasmas find that self-generated zonal flows can dominate the nonlinear saturation by preventing coherent structures from persisting or drifting in the energetic particle phase space when the mode frequency down-chirps. Results from the simulation with zonal flows agree quantitatively, for the first time, with experimental measurements of the fishbone saturation amplitude and energetic particle transport. Moreover, the fishbone-induced zonal flows are likely responsible for the formation of an internal transport barrier that was observed after fishbone bursts in this DIII-D experiment. Finally, gyrokinetic simulations of a related ITER baseline scenario show that the fishbone induces insignificant energetic particle redistribution and may enable high performance scenarios in ITER burning plasma experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.01792v4-abstract-full').style.display = 'none'; document.getElementById('2301.01792v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted in Physical Review Letters : https://journals.aps.org/prl/accepted/b0073Yf2Q4c1a78cb8611348c9fa5932b12922776</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review Letters 2024 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.06545">arXiv:2212.06545</a> <span> [<a href="https://arxiv.org/pdf/2212.06545">pdf</a>, <a href="https://arxiv.org/format/2212.06545">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0137834">10.1063/5.0137834 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Localization of fixed dipoles at high precision by accounting for sample drift during illumination </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hinterer%2C+F">Fabian Hinterer</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M+C">Magdalena C. Schneider</a>, <a href="/search/physics?searchtype=author&query=Hubmer%2C+S">Simon Hubmer</a>, <a href="/search/physics?searchtype=author&query=L%C3%B3pez-Martinez%2C+M">Montserrat L贸pez-Martinez</a>, <a href="/search/physics?searchtype=author&query=Ramlau%2C+R">Ronny Ramlau</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%BCtz%2C+G+J">Gerhard J. Sch眉tz</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.06545v1-abstract-short" style="display: inline;"> Single molecule localization microscopy relies on the precise quantification of the position of single dye emitters in a sample. This precision is improved by the number of photons that can be detected from each molecule. It is therefore recommendable to increase illumination times for the recording process. Particularly recording at cryogenic temperatures dramatically reduces photobleaching and t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.06545v1-abstract-full').style.display = 'inline'; document.getElementById('2212.06545v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.06545v1-abstract-full" style="display: none;"> Single molecule localization microscopy relies on the precise quantification of the position of single dye emitters in a sample. This precision is improved by the number of photons that can be detected from each molecule. It is therefore recommendable to increase illumination times for the recording process. Particularly recording at cryogenic temperatures dramatically reduces photobleaching and thereby allows a massive increase in illumination times to several seconds. As a downside, microscope instabilities may well introduce jitter during such long illuminations, deteriorating the localization precision. In this paper, we theoretically demonstrate that a parallel recording of fiducial marker beads together with a novel fitting approach accounting for the full drift trajectory allows for largely eliminating drift effects for drift magnitudes of several hundred nanometers per frame. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.06545v1-abstract-full').style.display = 'none'; document.getElementById('2212.06545v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.03768">arXiv:2212.03768</a> <span> [<a href="https://arxiv.org/pdf/2212.03768">pdf</a>, <a href="https://arxiv.org/format/2212.03768">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.proci.2022.07.207">10.1016/j.proci.2022.07.207 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effect of flame retardants on side-wall quenching of partially premixed laminar flames </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Steinhausen%2C+M">Matthias Steinhausen</a>, <a href="/search/physics?searchtype=author&query=Ferraro%2C+F">Federica Ferraro</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Max Schneider</a>, <a href="/search/physics?searchtype=author&query=Zentgraf%2C+F">Florian Zentgraf</a>, <a href="/search/physics?searchtype=author&query=Greifenstein%2C+M">Max Greifenstein</a>, <a href="/search/physics?searchtype=author&query=Dreizler%2C+A">Andreas Dreizler</a>, <a href="/search/physics?searchtype=author&query=Hasse%2C+C">Christian Hasse</a>, <a href="/search/physics?searchtype=author&query=Scholtissek%2C+A">Arne Scholtissek</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.03768v1-abstract-short" style="display: inline;"> A combined experimental and numerical investigation of partially premixed laminar methane-air flames undergoing side-wall quenching (SWQ) is performed. A well-established SWQ burner is adapted to allow the seeding of the main flow with additional gaseous products issued from a (secondary) wall inlet close to the flame's quenching point. First, the characteristics of the partially premixed flame th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.03768v1-abstract-full').style.display = 'inline'; document.getElementById('2212.03768v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.03768v1-abstract-full" style="display: none;"> A combined experimental and numerical investigation of partially premixed laminar methane-air flames undergoing side-wall quenching (SWQ) is performed. A well-established SWQ burner is adapted to allow the seeding of the main flow with additional gaseous products issued from a (secondary) wall inlet close to the flame's quenching point. First, the characteristics of the partially premixed flame that quenches at the wall are assessed using planar laser-induced fluorescence measurements of the OH radical, and a corresponding numerical simulation with fully-resolved transport and chemistry is conducted. A boundary layer of enriched mixture is formed at the wall, leading to a reaction zone parallel to the wall for high injection rates from the wall inlet. Subsequently, in a numerical study, the wall inflow is mixed with dimethylmethylphosphonat (DMMP), a phosphor-based flame retardant. The DMMP addition allows the assessment of the combined effects of heat loss and flame retardants on the flame structure during flame-wall interaction. With an increasing amount of DMMP in the injected mixture, the flame stabilizes further away from the wall and shows a decrease in the local heat-release rate. Thereby, the maximum wall heat flux is significantly reduced. That results in a lower thermal load on the quenching wall. The flame structure analysis shows an accumulation of the intermediate species HOPO at the wall similar to the CO accumulation during the quenching of premixed flames without flame retardant addition. The study shows how the structure of a partially premixed flame is influenced by a wall that releases either additional fuel or a mixture of fuel and flame retardant. The insights gained from the canonical configuration can lead to a better understanding of the combined effects of flame retardants and heat losses in near-wall flames. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.03768v1-abstract-full').style.display = 'none'; document.getElementById('2212.03768v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Proceedings of the Combustion Institute (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.07199">arXiv:2211.07199</a> <span> [<a href="https://arxiv.org/pdf/2211.07199">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</span> </div> </div> <p class="title is-5 mathjax"> Unitary response of solvatochromic dye to pulse excitation in lipid and cell membranes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fabiunke%2C+S">Simon Fabiunke</a>, <a href="/search/physics?searchtype=author&query=Fillafer%2C+C">Christian Fillafer</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M+F">Matthias F. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.07199v1-abstract-short" style="display: inline;"> The existence of acoustic pulse propagation in lipid monolayers at the air-water interface is well known. These pulses are controlled by the thermodynamic state of the lipid membrane. Nevertheless, the role of acoustic pulses for intra- and intercellular communication are still a matter of debate. Herein, we used the dye di 4- -ANEPPDHQ, which is known to be sensitive to the physical state and tra… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.07199v1-abstract-full').style.display = 'inline'; document.getElementById('2211.07199v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.07199v1-abstract-full" style="display: none;"> The existence of acoustic pulse propagation in lipid monolayers at the air-water interface is well known. These pulses are controlled by the thermodynamic state of the lipid membrane. Nevertheless, the role of acoustic pulses for intra- and intercellular communication are still a matter of debate. Herein, we used the dye di 4- -ANEPPDHQ, which is known to be sensitive to the physical state and transmembrane potential of membranes, in order to gain insight into compression waves in lipid-based membrane interfaces. The dye was incorporated into lipid monolayers made of phosphatidylserine or phosphatidylcholine at the air-water-interface. A significant blue shift of the emission spectrum was detected when the state of the monolayer was changed from the liquid expanded (LE) to the liquid condensed (LC) phase. This transition-sensitivity of di-4-ANEPPDHQ was generalized in experiments with the bulk solvent dimethyl sulfoxide (DMSO). Upon crystallization of solvent, the emission spectrum also underwent a blue shift. During compression pulses in lipid monolayers, a significant fluorescence response was only observed when in the main transition regime. The optical signature of these waves, in terms of sign and magnitude, was identical to the response of di-4-ANEPPDHQ during action potentials in neurons and excitable plant cells. These findings corroborated the suggestion that action potentials are nonlinear state changes that propagate in the cell membrane. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.07199v1-abstract-full').style.display = 'none'; document.getElementById('2211.07199v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Langmuir 2022 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.07193">arXiv:2211.07193</a> <span> [<a href="https://arxiv.org/pdf/2211.07193">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</span> </div> </div> <p class="title is-5 mathjax"> Surface Deformation During an Action Potential in Pearled Cells </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mussel%2C+M">Matan Mussel</a>, <a href="/search/physics?searchtype=author&query=Fillafer%2C+C">Christian Fillafer</a>, <a href="/search/physics?searchtype=author&query=Ben-Porath%2C+G">Gal Ben-Porath</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M+F">Matthias F. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.07193v1-abstract-short" style="display: inline;"> Electric pulses in biological cells (action potentials) have been reported to be accompanied by a propagating cell-surface deformation with a nano-scale amplitude. Typically, this cell surface is covered by external layers of polymer material (extracellular matrix, cell wall material etc.). It was recently demonstrated in excitable plant cells (Chara Braunii) that the rigid external layer (cell wa… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.07193v1-abstract-full').style.display = 'inline'; document.getElementById('2211.07193v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.07193v1-abstract-full" style="display: none;"> Electric pulses in biological cells (action potentials) have been reported to be accompanied by a propagating cell-surface deformation with a nano-scale amplitude. Typically, this cell surface is covered by external layers of polymer material (extracellular matrix, cell wall material etc.). It was recently demonstrated in excitable plant cells (Chara Braunii) that the rigid external layer (cell wall) hinders the underlying deformation. When the cell membrane was separated from the cell wall by osmosis, a mechanical deformation, in the micrometer range, was observed upon excitation of the cell. The underlying mechanism of this mechanical pulse has up to date remained elusive. Herein we report that Chara cells can undergo a pearling instability, and when the pearled fragments were excited even larger and more regular cell shape changes were observed (about 10 to 100 um in amplitude). These transient cellular deformations were captured by a curvature model that is based on three parameters: surface tension, bending rigidity and pressure difference across the surface. In this paper these parameters are extracted by curve-fitting to the experimental cellular shapes at rest and during excitation. This is a necessary step to identify the mechanical parameters that change during an action potential. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.07193v1-abstract-full').style.display = 'none'; document.getElementById('2211.07193v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13p</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PRE 2017 (96) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.07189">arXiv:2211.07189</a> <span> [<a href="https://arxiv.org/pdf/2211.07189">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1073/pnas.2117521119">10.1073/pnas.2117521119 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Sharp, localized phase transitions in single neuronal cells </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fedosejevs%2C+C+S">Carina S. Fedosejevs</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M+F">Matthias F. Schneider</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.07189v1-abstract-short" style="display: inline;"> The origin of nonlinear responses in cells has been suggested to be crucial for various cell functions including the propagation of the nervous impulse. In physics nonlinear behavior often originates from phase transitions. Evidence for such transitions on the single cell level, however, has so far not been provided leaving the field unattended by the biological community. Here we demonstrate that… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.07189v1-abstract-full').style.display = 'inline'; document.getElementById('2211.07189v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.07189v1-abstract-full" style="display: none;"> The origin of nonlinear responses in cells has been suggested to be crucial for various cell functions including the propagation of the nervous impulse. In physics nonlinear behavior often originates from phase transitions. Evidence for such transitions on the single cell level, however, has so far not been provided leaving the field unattended by the biological community. Here we demonstrate that single cells of a human neuronal cell line, display all optical features of a sharp, highly nonlinear phase transition within their membrane. The transition is reversible and does not origin from protein denaturation. Triggered by temperature and modified by pH here, a thermodynamic approach, strongly suggests, that similar nonlinear state changes can be induced by other variables such as calcium or mechanical stress. At least in lipid membranes such state changes are accompanied by significant changes in permeability, enzyme activity, elastic and electrical properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.07189v1-abstract-full').style.display = 'none'; document.getElementById('2211.07189v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12p 4 fig</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> published in PNAS 2022 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.17022">arXiv:2210.17022</a> <span> [<a href="https://arxiv.org/pdf/2210.17022">pdf</a>, <a href="https://arxiv.org/format/2210.17022">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0132706">10.1063/5.0132706 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High Gradient Testing of off-Axis Coupled C-band Cu and CuAg Accelerating Structures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Mitchell Schneider</a>, <a href="/search/physics?searchtype=author&query=Zuboraj%2C+M">Muhammed Zuboraj</a>, <a href="/search/physics?searchtype=author&query=Dolgashev%2C+V">Valery Dolgashev</a>, <a href="/search/physics?searchtype=author&query=Lewellen%2C+J+J">John J Lewellen</a>, <a href="/search/physics?searchtype=author&query=Tantawi%2C+S+G">Sami G Tantawi</a>, <a href="/search/physics?searchtype=author&query=Fleming%2C+R">Ryan Fleming</a>, <a href="/search/physics?searchtype=author&query=Gorelov%2C+D">Dmitry Gorelov</a>, <a href="/search/physics?searchtype=author&query=Middendorf%2C+M">Mark Middendorf</a>, <a href="/search/physics?searchtype=author&query=Nanni%2C+E+A">Emilio A Nanni</a>, <a href="/search/physics?searchtype=author&query=Simakov%2C+E+I">Evgenya I Simakov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.17022v1-abstract-short" style="display: inline;"> We report the results of high gradient testing of two single cell off axis coupled standing wave accelerating structures. Two brazed standing wave side coupled structures with the same geometry were tested one made of pure copper Cu and one made of a copper silver CuAg alloy with silver concentration of 0.08 percent. A peak surface electric field of 450 MV per m was achieved in the CuAg structure… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.17022v1-abstract-full').style.display = 'inline'; document.getElementById('2210.17022v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.17022v1-abstract-full" style="display: none;"> We report the results of high gradient testing of two single cell off axis coupled standing wave accelerating structures. Two brazed standing wave side coupled structures with the same geometry were tested one made of pure copper Cu and one made of a copper silver CuAg alloy with silver concentration of 0.08 percent. A peak surface electric field of 450 MV per m was achieved in the CuAg structure for a klystron input power of 14.5 MW and a 1 mirco s pulse length which was 25 percent higher than the peak surface electric field achieved in the Cu structure. The superb high gradient performance was achieved because of the two major optimizations in the cavity geometry 1 the shunt impedance of the cavity was maximized for a peak surface electric field to accelerating gradient ratio of 2 for a fully relativistic particle 2 the peak magnetic field enhancement due to the input coupler was minimized to limit pulse heating. These tests allow us to conclude that C band accelerating structures can operate at peak fields similar to those at higher frequencies while providing a larger beam iris for improved beam transport. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.17022v1-abstract-full').style.display = 'none'; document.getElementById('2210.17022v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.13047">arXiv:2209.13047</a> <span> [<a href="https://arxiv.org/pdf/2209.13047">pdf</a>, <a href="https://arxiv.org/format/2209.13047">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Evaluating Effects of Geometry and Material Composition on Production of Transversely Shaped Beams from Diamond Field Emission Array Cathodes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schneider%2C+M+E">Mitchell E. Schneider</a>, <a href="/search/physics?searchtype=author&query=Andrews%2C+H">Heather Andrews</a>, <a href="/search/physics?searchtype=author&query=Baryshev%2C+S+V">Sergey V. Baryshev</a>, <a href="/search/physics?searchtype=author&query=Jevarjian%2C+E">Emily Jevarjian</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+D">Dongsung Kim</a>, <a href="/search/physics?searchtype=author&query=Nichols%2C+K">Kimberley Nichols</a>, <a href="/search/physics?searchtype=author&query=Posos%2C+T+Y">Taha Y. Posos</a>, <a href="/search/physics?searchtype=author&query=Pettes%2C+M">Michael Pettes</a>, <a href="/search/physics?searchtype=author&query=Power%2C+J">John Power</a>, <a href="/search/physics?searchtype=author&query=Shao%2C+J">Jiahang Shao</a>, <a href="/search/physics?searchtype=author&query=Simakov%2C+E+I">Evgenya I. Simakov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.13047v1-abstract-short" style="display: inline;"> Field emission cathodes (FECs) are attractive for the next generation of injectors due to their ability to provide high current density bright beams with low intrinsic emittance. One application of FECs worthy of special attention is to provide transversely shaped electron beams for emittance exchange that translates a transverse electron beam pattern into a longitudinal pattern. FECs can be fabri… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.13047v1-abstract-full').style.display = 'inline'; document.getElementById('2209.13047v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.13047v1-abstract-full" style="display: none;"> Field emission cathodes (FECs) are attractive for the next generation of injectors due to their ability to provide high current density bright beams with low intrinsic emittance. One application of FECs worthy of special attention is to provide transversely shaped electron beams for emittance exchange that translates a transverse electron beam pattern into a longitudinal pattern. FECs can be fabricated in a desired pattern and produce transversely shaped beams without the need for complex masking or laser schemes. However, reliable and consistent production of transversely shaped beams is affected by material properties of the FEC. This paper reports the results of testing two diamond field emitter array (DFEA) FECs with the same lithography pattern and emitter geometry but different material and tip characteristics. Although both cathodes were able to sustain gradients of 44 MV/m and produce maximum output integral charge of 0.5 nC per radiofrequency (rf) pulse, their emission patterns were quite different. One cathode did not produce a patterned beam while the other one did. Differences in field emission characteristics and patterned beam production were explained by the differences in the tip geometry and the cathode material properties. The main practical takeaway was found to be that the tip sharpness was not a prerequisite for good patterned beam production. Instead, other material characteristics, such as the ballast resistance, determined cathode performance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.13047v1-abstract-full').style.display = 'none'; document.getElementById('2209.13047v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Schneider%2C+M&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Schneider%2C+M&start=0" class="pagination-link is-current" 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