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type="radio" value="hide"> <label for="abstracts-1">Hide abstracts</label></li></ul> </div> <div class="box field is-grouped is-grouped-multiline level-item"> <div class="control"> <span class="select is-small"> <select id="size" name="size"><option value="25">25</option><option selected value="50">50</option><option value="100">100</option><option value="200">200</option></select> </span> <label for="size">results per page</label>. </div> <div class="control"> <label for="order">Sort results by</label> <span class="select is-small"> <select id="order" name="order"><option selected value="-announced_date_first">Announcement date (newest first)</option><option value="announced_date_first">Announcement date (oldest first)</option><option value="-submitted_date">Submission date (newest first)</option><option value="submitted_date">Submission date (oldest first)</option><option value="">Relevance</option></select> </span> </div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <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/2406.13837">arXiv:2406.13837</a> <span> [<a href="https://arxiv.org/pdf/2406.13837">pdf</a>, <a href="https://arxiv.org/format/2406.13837">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/10.1017/jfm.2024.923">10.1017/jfm.2024.923 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> U-shaped disks in Stokes flow: Chiral sedimentation of a non-chiral particle </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Vaquero-Stainer%2C+C">Christian Vaquero-Stainer</a>, <a href="/search/physics?searchtype=author&query=Miara%2C+T">Tymoteusz Miara</a>, <a href="/search/physics?searchtype=author&query=Juel%2C+A">Anne Juel</a>, <a href="/search/physics?searchtype=author&query=Pihler-Puzovi%C4%87%2C+D">Draga Pihler-Puzovi膰</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+M">Matthias Heil</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="2406.13837v1-abstract-short" style="display: inline;"> We study the sedimentation of U-shaped circular disks in the Stokes limit of vanishing inertia. We simulate the flow past such disks using a finite-element-based solution of the 3D Stokes equations, accounting for the integrable singularities that develop along their edges. We show that the purely vertical sedimentation of such disks in their upright- [upside-down-] U orientation is unstable to pe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.13837v1-abstract-full').style.display = 'inline'; document.getElementById('2406.13837v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.13837v1-abstract-full" style="display: none;"> We study the sedimentation of U-shaped circular disks in the Stokes limit of vanishing inertia. We simulate the flow past such disks using a finite-element-based solution of the 3D Stokes equations, accounting for the integrable singularities that develop along their edges. We show that the purely vertical sedimentation of such disks in their upright- [upside-down-] U orientation is unstable to perturbations about their pitching [rolling] axes. The instability is found to depend only weakly on the size of the container in which the disks sediment, allowing us to analyse their behaviour based on the resistance matrix which governs the evolution of the disk's six rigid-body degrees of freedom in an unbounded fluid. We show that the governing equations can be reduced to two ODEs which describe the disk's inclination against the direction of gravity. A phase-plane analysis, results of which are in good agreement with experiments, reveals that the two instabilities generally cause the disk to sediment along complex spiral trajectories while it alternates between pitching- and rolling-dominated motions. The chirality of the trajectories is set by the initial conditions rather than the (non-chiral) shape of the disk. For certain initial orientations, the disk retains its inclination and sediments along a perfectly helical path. The observed behaviour is fundamentally different from that displayed by flat circular disks which sediment without any reorientation. We therefore study the effect of variations in the disk's curvature to show how in the limit of vanishing curvature the behaviour of a flat disk is recovered. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.13837v1-abstract-full').style.display = 'none'; document.getElementById('2406.13837v1-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> 19 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">27 pages, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Fluid Mech. 999 (2024) A71 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.02970">arXiv:2311.02970</a> <span> [<a href="https://arxiv.org/pdf/2311.02970">pdf</a>, <a href="https://arxiv.org/format/2311.02970">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="Soft Condensed Matter">cond-mat.soft</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"> Light-scattering reconstruction of transparent shapes using neural networks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Miara%2C+T">Tymoteusz Miara</a>, <a href="/search/physics?searchtype=author&query=Pihler-Puzovi%C4%87%2C+D">Draga Pihler-Puzovi膰</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+M">Matthias Heil</a>, <a href="/search/physics?searchtype=author&query=Juel%2C+A">Anne Juel</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="2311.02970v2-abstract-short" style="display: inline;"> We propose a cheap non-intrusive high-resolution method of visualising transparent or translucent objects which may translate, rotate and shapeshift. We propose a method of reconstructing a strongly deformed time-evolving surface from a time-series of noisy clouds of points using a lightweight neural network. We benchmark the method against three different geometries and varying levels of noise an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.02970v2-abstract-full').style.display = 'inline'; document.getElementById('2311.02970v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.02970v2-abstract-full" style="display: none;"> We propose a cheap non-intrusive high-resolution method of visualising transparent or translucent objects which may translate, rotate and shapeshift. We propose a method of reconstructing a strongly deformed time-evolving surface from a time-series of noisy clouds of points using a lightweight neural network. We benchmark the method against three different geometries and varying levels of noise and find that the Gaussian curvature is accurately recovered when the noise level is below $2\%$ of the diameter of the surface and the data from distinct regions of the surface do not overlap. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.02970v2-abstract-full').style.display = 'none'; document.getElementById('2311.02970v2-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> 8 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 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/2311.01898">arXiv:2311.01898</a> <span> [<a href="https://arxiv.org/pdf/2311.01898">pdf</a>, <a href="https://arxiv.org/format/2311.01898">other</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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> A Custom Discrete Amplifier-Shaper-Discriminator Circuit for the Drift Chambers of the R3B Experiment at GSI </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wiebusch%2C+M">Michael Wiebusch</a>, <a href="/search/physics?searchtype=author&query=Heggen%2C+H">Henning Heggen</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+M">Michael Heil</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="2311.01898v1-abstract-short" style="display: inline;"> This contribution presents a pragmatic approach to read-out electronics for drift chambers used in particle physics experiments, specifically for the R3B experiment at GSI. The design uses discrete miniature SMD components and LVDS inputs of a low-cost FPGA to achieve a performance similar to classic ASIC solutions to the problem. The circuit comprises a high gain, low noise amplifier, a custom si… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.01898v1-abstract-full').style.display = 'inline'; document.getElementById('2311.01898v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.01898v1-abstract-full" style="display: none;"> This contribution presents a pragmatic approach to read-out electronics for drift chambers used in particle physics experiments, specifically for the R3B experiment at GSI. The design uses discrete miniature SMD components and LVDS inputs of a low-cost FPGA to achieve a performance similar to classic ASIC solutions to the problem. The circuit comprises a high gain, low noise amplifier, a custom signal shaper, tailored to the specifics of proportional counter signals, and a leading-edge discriminator with programmable threshold. The presented approach offers an attractive solution for small to medium sized detector systems that require specialized read-out electronics but cannot afford the high cost and development effort associated with ASICs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.01898v1-abstract-full').style.display = 'none'; document.getElementById('2311.01898v1-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 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">Proceeding to TWEPP 2023 Topical Workshop on Electronics for Particle Physics, Oct 1-6, 2023, Geremeas, Sardinia, Italy</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.04381">arXiv:2210.04381</a> <span> [<a href="https://arxiv.org/pdf/2210.04381">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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="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"> Mechanism of Structural Colors in Binary Mixtures of Nanoparticle-based Supraballs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Heil%2C+C+M">Christian M. Heil</a>, <a href="/search/physics?searchtype=author&query=Patil%2C+A">Anvay Patil</a>, <a href="/search/physics?searchtype=author&query=Vanthournout%2C+B">Bram Vanthournout</a>, <a href="/search/physics?searchtype=author&query=Singla%2C+S">Saranshu Singla</a>, <a href="/search/physics?searchtype=author&query=Bleuel%2C+M">Markus Bleuel</a>, <a href="/search/physics?searchtype=author&query=Song%2C+J">Jing-Jin Song</a>, <a href="/search/physics?searchtype=author&query=Hu%2C+Z">Ziying Hu</a>, <a href="/search/physics?searchtype=author&query=Gianneschi%2C+N+C">Nathan C. Gianneschi</a>, <a href="/search/physics?searchtype=author&query=Shawkey%2C+M+D">Matthew D. Shawkey</a>, <a href="/search/physics?searchtype=author&query=Sinha%2C+S+K">Sunil K. Sinha</a>, <a href="/search/physics?searchtype=author&query=Jayaraman%2C+A">Arthi Jayaraman</a>, <a href="/search/physics?searchtype=author&query=Dhinojwala%2C+A">Ali Dhinojwala</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="2210.04381v1-abstract-short" style="display: inline;"> Inspired by structural colors in avian species, various synthetic strategies have been developed to produce non-iridescent, saturated colors using nanoparticle assemblies. Mixtures of nanoparticles varying in particle chemistry (or complex refractive indices) and particle size have additional emergent properties that impact the color produced. For such complex multi-component systems, an understan… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.04381v1-abstract-full').style.display = 'inline'; document.getElementById('2210.04381v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.04381v1-abstract-full" style="display: none;"> Inspired by structural colors in avian species, various synthetic strategies have been developed to produce non-iridescent, saturated colors using nanoparticle assemblies. Mixtures of nanoparticles varying in particle chemistry (or complex refractive indices) and particle size have additional emergent properties that impact the color produced. For such complex multi-component systems, an understanding of assembled structure along with a robust optical modeling tool can empower scientists to perform intensive structure-color relationship studies and fabricate designer materials with tailored color. Here, we demonstrate how we can reconstruct the assembled structure from small-angle scattering measurements using the computational reverse-engineering analysis for scattering experiments (CREASE) method and then use the reconstructed structure in finite-difference time-domain (FDTD) calculations to predict color. We successfully, quantitatively predict experimentally observed color in mixtures containing strongly absorbing melanin nanoparticles and demonstrate the influence of a single layer of segregated nanoparticles on color produced. The versatile computational approach presented in this work is useful for engineering synthetic materials with desired colors without laborious trial and error experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.04381v1-abstract-full').style.display = 'none'; document.getElementById('2210.04381v1-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, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">23 Pages, 5 Figures, 1 ToC Figure</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.13093">arXiv:2205.13093</a> <span> [<a href="https://arxiv.org/pdf/2205.13093">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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="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/10.1021/acsmaterialslett.2c00524">10.1021/acsmaterialslett.2c00524 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Modeling Structural Colors from Disordered One-Component Colloidal Nanoparticle-based Supraballs using Combined Experimental and Simulation Techniques </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Patil%2C+A">Anvay Patil</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+C+M">Christian M. Heil</a>, <a href="/search/physics?searchtype=author&query=Vanthournout%2C+B">Bram Vanthournout</a>, <a href="/search/physics?searchtype=author&query=Singla%2C+S">Saranshu Singla</a>, <a href="/search/physics?searchtype=author&query=Hu%2C+Z">Ziying Hu</a>, <a href="/search/physics?searchtype=author&query=Ilavsky%2C+J">Jan Ilavsky</a>, <a href="/search/physics?searchtype=author&query=Gianneschi%2C+N+C">Nathan C. Gianneschi</a>, <a href="/search/physics?searchtype=author&query=Shawkey%2C+M+D">Matthew D. Shawkey</a>, <a href="/search/physics?searchtype=author&query=Sinha%2C+S+K">Sunil K. Sinha</a>, <a href="/search/physics?searchtype=author&query=Jayaraman%2C+A">Arthi Jayaraman</a>, <a href="/search/physics?searchtype=author&query=Dhinojwala%2C+A">Ali Dhinojwala</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="2205.13093v4-abstract-short" style="display: inline;"> Bright, saturated structural colors in birds have inspired synthesis of self-assembled, disordered arrays of assembled nanoparticles with varied particle spacings and refractive indices. However, predicting colors of assembled nanoparticles, and thereby guiding their synthesis, remains challenging due to the effects of multiple scattering and strong absorption. Here, we use a computational approac… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.13093v4-abstract-full').style.display = 'inline'; document.getElementById('2205.13093v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.13093v4-abstract-full" style="display: none;"> Bright, saturated structural colors in birds have inspired synthesis of self-assembled, disordered arrays of assembled nanoparticles with varied particle spacings and refractive indices. However, predicting colors of assembled nanoparticles, and thereby guiding their synthesis, remains challenging due to the effects of multiple scattering and strong absorption. Here, we use a computational approach to first reconstruct the nanoparticles' assembled structures from small-angle scattering measurements and then input the reconstructed structures to a finite-difference time-domain method to predict their color and reflectance. This computational approach is successfully validated by comparing its predictions against experimentally measured reflectance and provides a pathway for reverse engineering colloidal assemblies with desired optical and photothermal properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.13093v4-abstract-full').style.display = 'none'; document.getElementById('2205.13093v4-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 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">14 pages, 3 figures, 1 ToC figure</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> ACS Materials Letters 2022 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.10687">arXiv:2111.10687</a> <span> [<a href="https://arxiv.org/pdf/2111.10687">pdf</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="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/10.1002/adom.202102162">10.1002/adom.202102162 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Structural Color Production in Melanin-based Disordered Colloidal Nanoparticle Assemblies in Spherical Confinement </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Patil%2C+A">Anvay Patil</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+C+M">Christian M. Heil</a>, <a href="/search/physics?searchtype=author&query=Vanthournout%2C+B">Bram Vanthournout</a>, <a href="/search/physics?searchtype=author&query=Bleuel%2C+M">Markus Bleuel</a>, <a href="/search/physics?searchtype=author&query=Singla%2C+S">Saranshu Singla</a>, <a href="/search/physics?searchtype=author&query=Hu%2C+Z">Ziying Hu</a>, <a href="/search/physics?searchtype=author&query=Gianneschi%2C+N+C">Nathan C. Gianneschi</a>, <a href="/search/physics?searchtype=author&query=Shawkey%2C+M+D">Matthew D. Shawkey</a>, <a href="/search/physics?searchtype=author&query=Sinha%2C+S+K">Sunil K. Sinha</a>, <a href="/search/physics?searchtype=author&query=Jayaraman%2C+A">Arthi Jayaraman</a>, <a href="/search/physics?searchtype=author&query=Dhinojwala%2C+A">Ali Dhinojwala</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="2111.10687v2-abstract-short" style="display: inline;"> Melanin is a ubiquitous natural pigment that exhibits broadband absorption and high refractive index. Despite its widespread use in structural color production, how the absorbing material, melanin, affects the generated color is unknown. Using a combined molecular dynamics and finite-difference time-domain computational approach, this paper investigates structural color generation in one-component… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.10687v2-abstract-full').style.display = 'inline'; document.getElementById('2111.10687v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.10687v2-abstract-full" style="display: none;"> Melanin is a ubiquitous natural pigment that exhibits broadband absorption and high refractive index. Despite its widespread use in structural color production, how the absorbing material, melanin, affects the generated color is unknown. Using a combined molecular dynamics and finite-difference time-domain computational approach, this paper investigates structural color generation in one-component melanin nanoparticle-based supra-assemblies (called supraballs) as well as binary mixtures of melanin and silica (non-absorbing) nanoparticle-based supraballs. Experimentally produced one-component melanin and one-component silica supraballs, with thoroughly characterized primary particle characteristics using neutron scattering, produce reflectance profiles similar to the computational analogues, confirming that the computational approach correctly simulates both absorption and multiple scattering from the self-assembled nanoparticles. These combined approaches demonstrate that melanin's broadband absorption increases the primary reflectance peak wavelength, increases saturation, and decreases lightness factor. In addition, the dispersity of nanoparticle size more strongly influences the optical properties of supraballs than packing fraction, as evidenced by production of a larger range of colors when size dispersity is varied versus packing fraction. For binary melanin and silica supraballs, the chemistry-based stratification allows for more diverse color generation and finer saturation tuning than does the degree of mixing/demixing between the two chemistries. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.10687v2-abstract-full').style.display = 'none'; document.getElementById('2111.10687v2-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 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </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">40 pages, Figure 6</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.00820">arXiv:2009.00820</a> <span> [<a href="https://arxiv.org/pdf/2009.00820">pdf</a>, <a href="https://arxiv.org/format/2009.00820">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/10.1017/jfm.2021.219">10.1017/jfm.2021.219 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Modelling finger propagation in elasto-rigid channels </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fontana%2C+J+V">J. V. Fontana</a>, <a href="/search/physics?searchtype=author&query=Juel%2C+A">A. Juel</a>, <a href="/search/physics?searchtype=author&query=Bergemann%2C+N">N. Bergemann</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+M">M. Heil</a>, <a href="/search/physics?searchtype=author&query=Hazel%2C+A+L">A. L. Hazel</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="2009.00820v1-abstract-short" style="display: inline;"> We conduct a theoretical study of a two-phase-fluid-structure interaction problem in which air is driven at constant volume flux into a liquid-filled Hele-Shaw channel whose upper boundary is an elastic sheet. A depth-averaged model in the frame of reference of the advancing air-liquid interface is used to investigate the steady and unsteady interface propagation modes via numerical simulation. In… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.00820v1-abstract-full').style.display = 'inline'; document.getElementById('2009.00820v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.00820v1-abstract-full" style="display: none;"> We conduct a theoretical study of a two-phase-fluid-structure interaction problem in which air is driven at constant volume flux into a liquid-filled Hele-Shaw channel whose upper boundary is an elastic sheet. A depth-averaged model in the frame of reference of the advancing air-liquid interface is used to investigate the steady and unsteady interface propagation modes via numerical simulation. In slightly collapsed channels, the steadily-propagating interface adopts a shape that is similar to the classic Saffman--Taylor finger in rigid Hele-Shaw cells. As the level of initial collapse increases the induced gradients in channel depth alter the morphology of the propagating finger and promote a variety of instabilities from tip-splitting to small-scale fingering on the curved interface, in qualitative agreement with experiments. The model has a complex solution structure with a wide range of stable and unstable, steady and time-periodic modes, many of which have similar driving pressures. We find good quantitative agreement between our model and the experimental data of Duclou茅 et al. (J. Fluid Mech. vol. 819, 2017, p 121) for the finger width, sheet profile and finger pressure, provided that corrections to account for the presence of liquid films on the upper and lower walls of the channel are included in the model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.00820v1-abstract-full').style.display = 'none'; document.getElementById('2009.00820v1-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 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </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, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">MSC Class:</span> 76T10 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.13695">arXiv:2006.13695</a> <span> [<a href="https://arxiv.org/pdf/2006.13695">pdf</a>, <a href="https://arxiv.org/ps/2006.13695">ps</a>, <a href="https://arxiv.org/format/2006.13695">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/10.1103/PhysRevLett.125.254501">10.1103/PhysRevLett.125.254501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Resonances in pulsatile channel flow with an elastic wall </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Xu%2C+D">Duo Xu</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+M">Matthias Heil</a>, <a href="/search/physics?searchtype=author&query=Seeb%C3%B6ck%2C+T">Thomas Seeb枚ck</a>, <a href="/search/physics?searchtype=author&query=Avila%2C+M">Marc Avila</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="2006.13695v2-abstract-short" style="display: inline;"> Interactions between fluids and elastic solids are ubiquitous in application ranging from aeronautical and civil engineering to physiological flows. Here we study the pulsatile flow through a two-dimensional Starling resistor as a simple model for unsteady flow in elastic vessels. We numerically solve the equations governing the flow and the large-displacement elasticity and show that the system r… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.13695v2-abstract-full').style.display = 'inline'; document.getElementById('2006.13695v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.13695v2-abstract-full" style="display: none;"> Interactions between fluids and elastic solids are ubiquitous in application ranging from aeronautical and civil engineering to physiological flows. Here we study the pulsatile flow through a two-dimensional Starling resistor as a simple model for unsteady flow in elastic vessels. We numerically solve the equations governing the flow and the large-displacement elasticity and show that the system responds as a forced harmonic oscillator with non-conventional damping. We derive an analytical prediction for the amplitude of the oscillatory wall deformation, and thus the conditions under which resonances occur or vanish. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.13695v2-abstract-full').style.display = 'none'; document.getElementById('2006.13695v2-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 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 125, 254501 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.01999">arXiv:2005.01999</a> <span> [<a href="https://arxiv.org/pdf/2005.01999">pdf</a>, <a href="https://arxiv.org/format/2005.01999">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-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/PhysRevA.102.042825">10.1103/PhysRevA.102.042825 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electron capture of Xe$^{54+}$ in collisions with H${_2}$ molecules in the energy range between 5.5 MeV/u and 30.9 MeV/u </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kr%C3%B6ger%2C+F+M">F. M. Kr枚ger</a>, <a href="/search/physics?searchtype=author&query=Weber%2C+G">G. Weber</a>, <a href="/search/physics?searchtype=author&query=Herdrich%2C+M+O">M. O. Herdrich</a>, <a href="/search/physics?searchtype=author&query=Glorius%2C+J">J. Glorius</a>, <a href="/search/physics?searchtype=author&query=Langer%2C+C">C. Langer</a>, <a href="/search/physics?searchtype=author&query=Slavkovsk%C3%A1%2C+Z">Z. Slavkovsk谩</a>, <a href="/search/physics?searchtype=author&query=Bott%2C+L">L. Bott</a>, <a href="/search/physics?searchtype=author&query=Brandau%2C+C">C. Brandau</a>, <a href="/search/physics?searchtype=author&query=Br%C3%BCckner%2C+B">B. Br眉ckner</a>, <a href="/search/physics?searchtype=author&query=Blaum%2C+K">K. Blaum</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+X">X. Chen</a>, <a href="/search/physics?searchtype=author&query=Dababneh%2C+S">S. Dababneh</a>, <a href="/search/physics?searchtype=author&query=Davinson%2C+T">T. Davinson</a>, <a href="/search/physics?searchtype=author&query=Erbacher%2C+P">P. Erbacher</a>, <a href="/search/physics?searchtype=author&query=Fiebiger%2C+S">S. Fiebiger</a>, <a href="/search/physics?searchtype=author&query=Ga%C3%9Fner%2C+T">T. Ga脽ner</a>, <a href="/search/physics?searchtype=author&query=G%C3%B6bel%2C+K">K. G枚bel</a>, <a href="/search/physics?searchtype=author&query=Groothuis%2C+M">M. Groothuis</a>, <a href="/search/physics?searchtype=author&query=Gumberidze%2C+A">A. Gumberidze</a>, <a href="/search/physics?searchtype=author&query=Gy%C3%BCrky%2C+G">Gy. Gy眉rky</a>, <a href="/search/physics?searchtype=author&query=Hagmann%2C+S">S. Hagmann</a>, <a href="/search/physics?searchtype=author&query=Hahn%2C+C">C. Hahn</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+M">M. Heil</a>, <a href="/search/physics?searchtype=author&query=Hess%2C+R">R. Hess</a>, <a href="/search/physics?searchtype=author&query=Hensch%2C+R">R. Hensch</a> , et al. (41 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="2005.01999v2-abstract-short" style="display: inline;"> The electron capture process was studied for Xe$^{54+}$ colliding with H$_2$ molecules at the internal gas target of the ESR storage ring at GSI, Darmstadt. Cross section values for electron capture into excited projectile states were deduced from the observed emission cross section of Lyman radiation, being emitted by the hydrogen-like ions subsequent to the capture of a target electron. The ion… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.01999v2-abstract-full').style.display = 'inline'; document.getElementById('2005.01999v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.01999v2-abstract-full" style="display: none;"> The electron capture process was studied for Xe$^{54+}$ colliding with H$_2$ molecules at the internal gas target of the ESR storage ring at GSI, Darmstadt. Cross section values for electron capture into excited projectile states were deduced from the observed emission cross section of Lyman radiation, being emitted by the hydrogen-like ions subsequent to the capture of a target electron. The ion beam energy range was varied between 5.5 MeV/u and 30.9 MeV/u by applying the deceleration mode of the ESR. Thus, electron capture data was recorded at the intermediate and in particular the low collision energy regime, well below the beam energy necessary to produce bare xenon ions. The obtained data is found to be in reasonable qualitative agreement with theoretical approaches, while a commonly applied empirical formula significantly overestimates the experimental findings. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.01999v2-abstract-full').style.display = 'none'; document.getElementById('2005.01999v2-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 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 102, 042825 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.00047">arXiv:1907.00047</a> <span> [<a href="https://arxiv.org/pdf/1907.00047">pdf</a>, <a href="https://arxiv.org/format/1907.00047">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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="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/10.1017/jfm.2019.979">10.1017/jfm.2019.979 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Deformation and sorting of capsules in a T-junction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=H%C3%A4ner%2C+E">E. H盲ner</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+M">M. Heil</a>, <a href="/search/physics?searchtype=author&query=Juel%2C+A">A. Juel</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="1907.00047v1-abstract-short" style="display: inline;"> We study experimentally the motion and deformation of individual capsules transported by a constant volume-flux flow of low Reynolds number, through the T-junction of a channel with rectangular cross-section. We use millimetric ovalbumin-alginate capsules which we manufacture and characterise independently of the flow experiment. Centred capsules travel at constant velocity down the straight chann… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.00047v1-abstract-full').style.display = 'inline'; document.getElementById('1907.00047v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.00047v1-abstract-full" style="display: none;"> We study experimentally the motion and deformation of individual capsules transported by a constant volume-flux flow of low Reynolds number, through the T-junction of a channel with rectangular cross-section. We use millimetric ovalbumin-alginate capsules which we manufacture and characterise independently of the flow experiment. Centred capsules travel at constant velocity down the straight channel leading to the T-junction where they decelerate and expand in the spanwise direction before turning into one of the two identical daughter channels. There, non-inertial lift forces act to re-centre them and relax their shape until they reach a steady state of propagation. We find that the dynamics of fixed-size capsules within our channel geometry are governed by a capillary number Ca defined as the ratio of viscous shear forces to elastic restoring forces. We quantify the elastic forces by statically compressing the capsule to 50% of its initial diameter between parallel plates rather than by the Young's modulus of the encapsulating membrane, in order to account for different membrane thickness, pre-inflation and non-linear elastic deformation. We show that the maximum extension in the T-junction of capsules of different stiffness collapses onto a master curve in Ca. Thus, it provides a sensitive measure of the relative stiffness of capsules at constant flow rate, particularly for softer capsules. We also find that the T-junction can sort fixed-size capsules according to their stiffness because the position in the T-junction from which capsules are entrained into the daughter channel depends uniquely on Ca. We demonstrate that a T-junction can be used as a sorting device by enhancing this initial capsule separation through a diffuser. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.00047v1-abstract-full').style.display = 'none'; document.getElementById('1907.00047v1-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 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </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">24 pages, 15 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/1903.00903">arXiv:1903.00903</a> <span> [<a href="https://arxiv.org/pdf/1903.00903">pdf</a>, <a href="https://arxiv.org/format/1903.00903">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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"> Self-similar and disordered front propagation in a radial Hele-Shaw channel with time-varying cell depth </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Vaquero-Stainer%2C+C">Christian Vaquero-Stainer</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+M">Matthias Heil</a>, <a href="/search/physics?searchtype=author&query=Juel%2C+A">Anne Juel</a>, <a href="/search/physics?searchtype=author&query=Pihler-Puzovic%2C+D">Draga Pihler-Puzovic</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="1903.00903v1-abstract-short" style="display: inline;"> The displacement of a viscous fluid by an air bubble in the narrow gap between two parallel plates can readily drive complex interfacial pattern formation known as viscous fingering. We focus on a modified system suggested recently by [1], in which the onset of the fingering instability is delayed by introducing a time-dependent (power-law) plate separation. We perform a complete linear stability… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.00903v1-abstract-full').style.display = 'inline'; document.getElementById('1903.00903v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1903.00903v1-abstract-full" style="display: none;"> The displacement of a viscous fluid by an air bubble in the narrow gap between two parallel plates can readily drive complex interfacial pattern formation known as viscous fingering. We focus on a modified system suggested recently by [1], in which the onset of the fingering instability is delayed by introducing a time-dependent (power-law) plate separation. We perform a complete linear stability analysis of a depth-averaged theoretical model to show that the plate separation delays the onset of non-axisymmetric instabilities, in qualitative agreement with the predictions obtained from a simplified analysis by [1]. We then employ direct numerical simulations to show that in the parameter regime where the axisymmetrically expanding air bubble is unstable to nonaxisymmetric perturbations, the interface can evolve in a self-similar fashion such that the interface shape at a given time is simply a rescaled version of the shape at an earlier time. These novel, self-similar solutions are linearly stable but they only develop if the initially circular interface is subjected to unimodal perturbations. Conversely, the application of non-unimodal perturbations (e.g. via the superposition of multiple linearly unstable modes) leads to the development of complex, constantly evolving finger patterns similar to those that are typically observed in constant-width Hele-Shaw cells. [1] Z. Zheng, H. Kim, and H. A. Stone, Controlling viscous fingering using time-dependent strategies, Phys. Rev. Lett. 115, 174501 (2015). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1903.00903v1-abstract-full').style.display = 'none'; document.getElementById('1903.00903v1-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 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2019. </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, 8 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/1406.5830">arXiv:1406.5830</a> <span> [<a href="https://arxiv.org/pdf/1406.5830">pdf</a>, <a href="https://arxiv.org/ps/1406.5830">ps</a>, <a href="https://arxiv.org/format/1406.5830">other</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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</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/10.1140/epja/i2014-14112-0">10.1140/epja/i2014-14112-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Efficiency determination of resistive plate chambers for fast quasi-monoenergetic neutrons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=R%C3%B6der%2C+M">M. R枚der</a>, <a href="/search/physics?searchtype=author&query=Elekes%2C+Z">Z. Elekes</a>, <a href="/search/physics?searchtype=author&query=Aumann%2C+T">T. Aumann</a>, <a href="/search/physics?searchtype=author&query=Bemmerer%2C+D">D. Bemmerer</a>, <a href="/search/physics?searchtype=author&query=Boretzky%2C+K">K. Boretzky</a>, <a href="/search/physics?searchtype=author&query=Caesar%2C+C">C. Caesar</a>, <a href="/search/physics?searchtype=author&query=Cowan%2C+T+E">T. E. Cowan</a>, <a href="/search/physics?searchtype=author&query=Hehner%2C+J">J. Hehner</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+M">M. Heil</a>, <a href="/search/physics?searchtype=author&query=Kempe%2C+M">M. Kempe</a>, <a href="/search/physics?searchtype=author&query=Maroussov%2C+V">V. Maroussov</a>, <a href="/search/physics?searchtype=author&query=Nusair%2C+O">O. Nusair</a>, <a href="/search/physics?searchtype=author&query=Prokofiev%2C+A+V">A. V. Prokofiev</a>, <a href="/search/physics?searchtype=author&query=Reifarth%2C+R">R. Reifarth</a>, <a href="/search/physics?searchtype=author&query=Sobiella%2C+M">M. Sobiella</a>, <a href="/search/physics?searchtype=author&query=Stach%2C+D">D. Stach</a>, <a href="/search/physics?searchtype=author&query=Wagner%2C+A">A. Wagner</a>, <a href="/search/physics?searchtype=author&query=Yakorev%2C+D">D. Yakorev</a>, <a href="/search/physics?searchtype=author&query=Zilges%2C+A">A. Zilges</a>, <a href="/search/physics?searchtype=author&query=Zuber%2C+K">K. Zuber</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="1406.5830v2-abstract-short" style="display: inline;"> Composite detectors made of stainless steel converters and multigap resistive plate chambers have been irradiated with quasi-monoenergetic neutrons with a peak energy of 175MeV. The neutron detection efficiency has been determined using two different methods. The data are in agreement with the output of Monte Carlo simulations. The simulations are then extended to study the response of a hypotheti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.5830v2-abstract-full').style.display = 'inline'; document.getElementById('1406.5830v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1406.5830v2-abstract-full" style="display: none;"> Composite detectors made of stainless steel converters and multigap resistive plate chambers have been irradiated with quasi-monoenergetic neutrons with a peak energy of 175MeV. The neutron detection efficiency has been determined using two different methods. The data are in agreement with the output of Monte Carlo simulations. The simulations are then extended to study the response of a hypothetical array made of these detectors to energetic neutrons from a radioactive ion beam experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.5830v2-abstract-full').style.display = 'none'; document.getElementById('1406.5830v2-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 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 June, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2014. </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 Eur.Phys.J. A; upgraded version correcting some typos and updating ref. 6</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. A (2014) 50: 112 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1310.4487">arXiv:1310.4487</a> <span> [<a href="https://arxiv.org/pdf/1310.4487">pdf</a>, <a href="https://arxiv.org/ps/1310.4487">ps</a>, <a href="https://arxiv.org/format/1310.4487">other</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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</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/S0168-9002(00)00993-1">10.1016/S0168-9002(00)00993-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A 4p BaF2 detector for (n,g) cross section measurements at a spallation neutron source </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Heil%2C+M">M. Heil</a>, <a href="/search/physics?searchtype=author&query=Reifarth%2C+R">R. Reifarth</a>, <a href="/search/physics?searchtype=author&query=Fowler%2C+M+M">M. M. Fowler</a>, <a href="/search/physics?searchtype=author&query=Haight%2C+R+C">R. C. Haight</a>, <a href="/search/physics?searchtype=author&query=K%C3%A4ppeler%2C+F">F. K盲ppeler</a>, <a href="/search/physics?searchtype=author&query=Rundberg%2C+R+S">R. S. Rundberg</a>, <a href="/search/physics?searchtype=author&query=Seabury%2C+E+H">E. H. Seabury</a>, <a href="/search/physics?searchtype=author&query=Ullmann%2C+J+L">J. L. Ullmann</a>, <a href="/search/physics?searchtype=author&query=Wilhelmy%2C+J+B">J. B. Wilhelmy</a>, <a href="/search/physics?searchtype=author&query=Wisshak%2C+K">K. Wisshak</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="1310.4487v1-abstract-short" style="display: inline;"> The quest for improved neutron capture cross sections for advanced reactor concepts, transmutation of radioactive wastes as well as for astrophysical scenarios of neutron capture nucleosynthesis has motivated new experimental efforts based on modern techniques. Recent measurements in the keV region have shown that a 4p BaF2 detector represents an accurate and versatile instrument for such studies.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1310.4487v1-abstract-full').style.display = 'inline'; document.getElementById('1310.4487v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1310.4487v1-abstract-full" style="display: none;"> The quest for improved neutron capture cross sections for advanced reactor concepts, transmutation of radioactive wastes as well as for astrophysical scenarios of neutron capture nucleosynthesis has motivated new experimental efforts based on modern techniques. Recent measurements in the keV region have shown that a 4p BaF2 detector represents an accurate and versatile instrument for such studies. The present work deals with the potential of such a 4p BaF2 detector in combination with spallation neutron sources, which offer large neutron fluxes over a wide energy range. Detailed Monte Carlo simulations with the GEANT package have been performed to investigate the critical backgrounds at a spallation facility, to optimize the detector design, and to discuss alternative solutions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1310.4487v1-abstract-full').style.display = 'none'; document.getElementById('1310.4487v1-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 October, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Instruments and Methods in Physics Research A 459 (2001) 229}246 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1310.3181">arXiv:1310.3181</a> <span> [<a href="https://arxiv.org/pdf/1310.3181">pdf</a>, <a href="https://arxiv.org/format/1310.3181">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"> Wrinkly fingers: the interaction between fluid- and solid-based instabilities in elastic-walled Hele-Shaw cells </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pihler-Puzovi%C4%87%2C+D">Draga Pihler-Puzovi膰</a>, <a href="/search/physics?searchtype=author&query=Juel%2C+A">Anne Juel</a>, <a href="/search/physics?searchtype=author&query=Heil%2C+M">Matthias Heil</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="1310.3181v1-abstract-short" style="display: inline;"> In this fluid dynamics video, we study a two-phase flow in an elastic Hele-Shaw cell that involves two distinct fluid- and solid-based instabilities: viscous fingering and sheet buckling. We show that the relative importance of the two instabilities is controlled by a single non-dimensional parameter, which provides a measure of the elasticity of the flexible wall. We employ numerical simulations… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1310.3181v1-abstract-full').style.display = 'inline'; document.getElementById('1310.3181v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1310.3181v1-abstract-full" style="display: none;"> In this fluid dynamics video, we study a two-phase flow in an elastic Hele-Shaw cell that involves two distinct fluid- and solid-based instabilities: viscous fingering and sheet buckling. We show that the relative importance of the two instabilities is controlled by a single non-dimensional parameter, which provides a measure of the elasticity of the flexible wall. We employ numerical simulations to show that for relatively stiff [soft] walls, the system's behaviour is dominated by viscous fingering [sheet buckling]. Strong interactions between the two instabilities arise in an intermediate regime and lead to the development of extremely complex fingering and buckling patterns. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1310.3181v1-abstract-full').style.display = 'none'; document.getElementById('1310.3181v1-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> 11 October, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2013. </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">3 pages, 2 linked videos</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 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