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super-exchange coupling</title> <meta name="description" content="Search results for: super-exchange coupling"> <meta name="keywords" content="super-exchange coupling"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button 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action="https://publications.waset.org/abstracts/search"> <div id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="super-exchange coupling"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 700</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: super-exchange coupling</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">700</span> Strong Antiferromagnetic Super Exchange in AgF2 </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Wojciech%20Grochala">Wojciech Grochala</a> </p> <p class="card-text"><strong>Abstract:</strong></p> AgF2 is an important two-dimensional antiferromagnet and an analogue of [CuO2]2– sheet. However, the strength of magnetic superexchange as well as magnetic dimensionality have not been explored before . Here we report our recent Raman and neutron scattering experiments which led to better understanding of the magnetic properties of the title compound. It turns out that intra-sheet magnetic superexchange constant reaches 70 meV, thus some 2/3 of the value measured for parent compounds of oxocuprate superconductors which is over 100 meV. The ratio of intra-to-inter-sheet superexchange constants is of the order of 102 rendering AgF2 a quasi-2D material, similar to the said oxocuprates. The quantum mechanical calculations reproduce the abovementioned values quite well and they point out to substantial covalence of the Ag–F bonding. After 3 decades of intense research on layered oxocuprates, AgF2 now stands as a second-to-none analogue of these fascinating systems. It remains to be seen whether this 012 parent compound may be doped in order to achieve superconductivity. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=antiferromagnets" title="antiferromagnets">antiferromagnets</a>, <a href="https://publications.waset.org/abstracts/search?q=superexchange" title=" superexchange"> superexchange</a>, <a href="https://publications.waset.org/abstracts/search?q=silver" title=" silver"> silver</a>, <a href="https://publications.waset.org/abstracts/search?q=fluorine" title=" fluorine"> fluorine</a> </p> <a href="https://publications.waset.org/abstracts/105353/strong-antiferromagnetic-super-exchange-in-agf2" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/105353.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">129</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">699</span> Investigation on the Behavior of Conventional Reinforced Coupling Beams</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Akash%20K.%20Walunj">Akash K. Walunj</a>, <a href="https://publications.waset.org/abstracts/search?q=Dipendu%20Bhunia"> Dipendu Bhunia</a>, <a href="https://publications.waset.org/abstracts/search?q=Samarth%20Gupta"> Samarth Gupta</a>, <a href="https://publications.waset.org/abstracts/search?q=Prabhat%20Gupta"> Prabhat Gupta</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Coupled shear walls consist of two shear walls connected intermittently by beams along the height. The behavior of coupled shear walls is mainly governed by the coupling beams. The coupling beams are designed for ductile inelastic behavior in order to dissipate energy. The base of the shear walls may be designed for elastic or ductile inelastic behavior. The amount of energy dissipation depends on the yield moment capacity and plastic rotation capacity of the coupling beams. In this paper, an analytical model of coupling beam was developed to calculate the rotations and moment capacities of coupling beam with conventional reinforcement. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=design%20studies" title="design studies">design studies</a>, <a href="https://publications.waset.org/abstracts/search?q=computational%20model%28s%29" title=" computational model(s)"> computational model(s)</a>, <a href="https://publications.waset.org/abstracts/search?q=case%20study%2Fstudies" title=" case study/studies"> case study/studies</a>, <a href="https://publications.waset.org/abstracts/search?q=modelling" title=" modelling"> modelling</a>, <a href="https://publications.waset.org/abstracts/search?q=coupling%20beam" title=" coupling beam"> coupling beam</a> </p> <a href="https://publications.waset.org/abstracts/3310/investigation-on-the-behavior-of-conventional-reinforced-coupling-beams" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/3310.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">476</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">698</span> Empirical Investigation for the Correlation between Object-Oriented Class Lack of Cohesion and Coupling</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jehad%20Al%20Dallal">Jehad Al Dallal</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The design of the internal relationships among object-oriented class members (i.e., attributes and methods) and the external relationships among classes affects the overall quality of the object-oriented software. The degree of relatedness among class members is referred to as class cohesion and the degree to which a class is related to other classes is called class coupling. Well designed classes are expected to exhibit high cohesion and low coupling values. In this paper, using classes of three open-source Java systems, we empirically investigate the relation between class cohesion and coupling. In the empirical study, five lack-of-cohesion metrics and eight coupling metrics are considered. The empirical study results show that class cohesion and coupling internal quality attributes are inversely correlated. The strength of the correlation highly depends on the cohesion and coupling measurement approaches. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=class%20cohesion%20measure" title="class cohesion measure">class cohesion measure</a>, <a href="https://publications.waset.org/abstracts/search?q=class%20coupling%20measure" title=" class coupling measure"> class coupling measure</a>, <a href="https://publications.waset.org/abstracts/search?q=object-oriented%20class" title=" object-oriented class"> object-oriented class</a>, <a href="https://publications.waset.org/abstracts/search?q=software%20quality" title=" software quality"> software quality</a> </p> <a href="https://publications.waset.org/abstracts/45455/empirical-investigation-for-the-correlation-between-object-oriented-class-lack-of-cohesion-and-coupling" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/45455.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">236</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">697</span> Empirical Exploration for the Correlation between Class Object-Oriented Connectivity-Based Cohesion and Coupling</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jehad%20Al%20Dallal">Jehad Al Dallal</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Attributes and methods are the basic contents of an object-oriented class. The connectivity among these class members and the relationship between the class and other classes play an important role in determining the quality of an object-oriented system. Class cohesion evaluates the degree of relatedness of class attributes and methods, whereas class coupling refers to the degree to which a class is related to other classes. Researchers have proposed several class cohesion and class coupling measures. However, the correlation between class coupling and class cohesion measures have not been thoroughly studied. In this paper, using classes of three open-source Java systems, we empirically investigate the correlation between several measures of connectivity-based class cohesion and coupling. Four connectivity-based cohesion measures and eight coupling measures are considered in the empirical study. The empirical study results show that class connectivity-based cohesion and coupling internal quality attributes are inversely correlated. The strength of the correlation depends highly on the cohesion and coupling measurement approaches. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=object-oriented%20class" title="object-oriented class">object-oriented class</a>, <a href="https://publications.waset.org/abstracts/search?q=software%20quality" title=" software quality"> software quality</a>, <a href="https://publications.waset.org/abstracts/search?q=class%20cohesion%20measure" title=" class cohesion measure"> class cohesion measure</a>, <a href="https://publications.waset.org/abstracts/search?q=class%20coupling%20measure" title=" class coupling measure"> class coupling measure</a> </p> <a href="https://publications.waset.org/abstracts/18331/empirical-exploration-for-the-correlation-between-class-object-oriented-connectivity-based-cohesion-and-coupling" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/18331.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">321</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">696</span> Capacitive Coupling Wireless Power Transfer System with 6.78 MHz Class D Inverter</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kang%20Hyun%20Yi">Kang Hyun Yi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Wireless power transfer technologies are inductive coupling, magnetic resonance, and capacitive coupling methods, typically. Among them, the capacitive coupling wireless power transfer, also named Capacitive Coupling Wireless Power Transfer (CCWPT), has been researched to overcome the drawbacks of other approaches. The CCWPT has many advantages such as a simple structure, low standing power loss, reduced Electromagnetic Interference (EMI) and the ability to transfer power through metal barriers. In this paper, the CCWPT system with 6.78MHz class D inverter is proposed and analyzed. The proposed system is consisted of the 6.78MHz class D inverter with the LC low pass filter, the capacitor between a transmitter and a receiver and impedance transformers. The system is verified with a prototype for charging mobile devices. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=wireless%20power%20transfer" title="wireless power transfer">wireless power transfer</a>, <a href="https://publications.waset.org/abstracts/search?q=capacitive%20coupling%20power%20transfer" title=" capacitive coupling power transfer"> capacitive coupling power transfer</a>, <a href="https://publications.waset.org/abstracts/search?q=class%20D%20inverter" title=" class D inverter"> class D inverter</a>, <a href="https://publications.waset.org/abstracts/search?q=6.78MHz" title=" 6.78MHz"> 6.78MHz</a> </p> <a href="https://publications.waset.org/abstracts/14367/capacitive-coupling-wireless-power-transfer-system-with-678-mhz-class-d-inverter" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/14367.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">650</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">695</span> Anti-Phase Synchronization of Complex Delayed Networks with Output Coupling via Pinning Control</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Chanyuan%20Gu">Chanyuan Gu</a>, <a href="https://publications.waset.org/abstracts/search?q=Shouming%20Zhong"> Shouming Zhong</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Synchronization is a fundamental phenomenon that enables coherent behavior in networks as a result of interactions. The purpose of this research had been to investigate the problem of anti-phase synchronization for complex delayed dynamical networks with output coupling. The coupling configuration is general, with the coupling matrix not assumed to be symmetric or irreducible. The amount of the coupling variables between two connected nodes is flexible, the nodes in the drive and response systems need not to be identical and there is not any extra constraint on the coupling matrix. Some pinning controllers are designed to make the drive-response system achieve the anti-phase synchronization. For the convenience of description, we applied the matrix Kronecker product. Some new criteria are proposed based on the Lyapunov stability theory, linear matrix inequalities (LMI) and Schur complement. Lastly, some simulation examples are provided to illustrate the effectiveness of our proposed conditions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anti-phase%20synchronization" title="anti-phase synchronization">anti-phase synchronization</a>, <a href="https://publications.waset.org/abstracts/search?q=complex%20networks" title=" complex networks"> complex networks</a>, <a href="https://publications.waset.org/abstracts/search?q=output%20coupling" title=" output coupling"> output coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=pinning%20control" title=" pinning control"> pinning control</a> </p> <a href="https://publications.waset.org/abstracts/38055/anti-phase-synchronization-of-complex-delayed-networks-with-output-coupling-via-pinning-control" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/38055.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">394</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">694</span> Substrate Coupling in Millimeter Wave Frequencies</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Vasileios%20Gerakis">Vasileios Gerakis</a>, <a href="https://publications.waset.org/abstracts/search?q=Fontounasios%20Christos"> Fontounasios Christos</a>, <a href="https://publications.waset.org/abstracts/search?q=Alkis%20Hatzopoulos"> Alkis Hatzopoulos</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A study of the impact of metal guard rings on the coupling between two square metal pads is presented. The structure is designed over a bulk silicon substrate with epitaxial layer, so the coupling through the substrate is also involved. A lightly doped profile is adopted and is simulated by means of an electromagnetic simulator for various pad distances and different metal layers, assuming a 65 nm bulk CMOS technology. The impact of various guard ring design (geometrical) parameters is examined. Furthermore, the increase of isolation (resulting in reduction of the noise coupling) between the pads by cutting the ring, or by using multiple rings, is also analyzed. S parameters are used to compare the various structures. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=guard%20rings" title="guard rings">guard rings</a>, <a href="https://publications.waset.org/abstracts/search?q=metal%20pad%20coupling" title=" metal pad coupling"> metal pad coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=millimeter%20wave%20frequencies" title=" millimeter wave frequencies"> millimeter wave frequencies</a>, <a href="https://publications.waset.org/abstracts/search?q=substrate%20noise" title=" substrate noise"> substrate noise</a>, <a href="https://publications.waset.org/abstracts/search?q=" title=" "> </a> </p> <a href="https://publications.waset.org/abstracts/26875/substrate-coupling-in-millimeter-wave-frequencies" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/26875.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">539</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">693</span> Comparison Analysis of CFD Turbulence Fluid Numerical Study for Quick Coupling</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=JoonHo%20Lee">JoonHo Lee</a>, <a href="https://publications.waset.org/abstracts/search?q=KyoJin%20An"> KyoJin An</a>, <a href="https://publications.waset.org/abstracts/search?q=JunSu%20Kim"> JunSu Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Young-Chul%20Park"> Young-Chul Park</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, the fluid flow characteristics and performance numerical study through CFD model of the Non-split quick coupling for flow control in hydraulic system equipment for the aerospace business group focused to predict. In this study, we considered turbulence models for the application of Computational Fluid Dynamics for the CFD model of the Non-split Quick Coupling for aerospace business. In addition to this, the adequacy of the CFD model were verified by comparing with standard value. Based on this analysis, accurate the fluid flow characteristics can be predicted. It is, therefore, the design of the fluid flow characteristic contribute the reliability for the Quick Coupling which is required in industries on the basis of research results. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=CFD" title="CFD">CFD</a>, <a href="https://publications.waset.org/abstracts/search?q=FEM" title=" FEM"> FEM</a>, <a href="https://publications.waset.org/abstracts/search?q=quick%20coupling" title=" quick coupling"> quick coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=turbulence" title=" turbulence"> turbulence</a> </p> <a href="https://publications.waset.org/abstracts/31538/comparison-analysis-of-cfd-turbulence-fluid-numerical-study-for-quick-coupling" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/31538.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">384</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">692</span> Detection of Coupling Misalignment in a Rotor System Using Wavelet Transforms</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Prabhakar%20Sathujoda">Prabhakar Sathujoda</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Vibration analysis of a misaligned rotor coupling bearing system has been carried out while decelerating through its critical speed. The finite element method (FEM) is used to model the rotor system and simulate flexural vibrations. A flexible coupling with a frictionless joint is considered in the present work. The continuous wavelet transform is used to extract the misalignment features from the simulated time response. Subcritical speeds at one-half, one-third, and one-fourth the critical speed have appeared in the wavelet transformed vibration response of a misaligned rotor coupling bearing system. These features are also verified through a parametric study. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Continuous%20Wavelet%20Transform" title="Continuous Wavelet Transform">Continuous Wavelet Transform</a>, <a href="https://publications.waset.org/abstracts/search?q=Flexible%20Coupling" title=" Flexible Coupling"> Flexible Coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=Rotor%20System" title=" Rotor System"> Rotor System</a>, <a href="https://publications.waset.org/abstracts/search?q=Sub%20Critical%20Speed" title=" Sub Critical Speed"> Sub Critical Speed</a> </p> <a href="https://publications.waset.org/abstracts/123448/detection-of-coupling-misalignment-in-a-rotor-system-using-wavelet-transforms" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/123448.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">162</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">691</span> Understanding the Conflict Between Ecological Environment and Human Activities in the Process of Urbanization</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yazhou%20Zhou">Yazhou Zhou</a>, <a href="https://publications.waset.org/abstracts/search?q=Yong%20Huang"> Yong Huang</a>, <a href="https://publications.waset.org/abstracts/search?q=Guoqin%20Ge"> Guoqin Ge</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In the process of human social development, the coupling and coordinated development among the ecological environment(E), production(P), and living functions(L) is of great significance for sustainable development. This study uses an improved coupling coordination degree model (CCDM) to discover the coordination conflict between E and human settlement environment. The main work of this study is as follows: (1) It is found that in the process of urbanization development of Ya 'an city from 2014 to 2018, the degree of coupling (DOC) value between E, P, and L is high, but the coupling coordination degree (CCD) of the three is low, especially the DOC value of E and the other two has the biggest decline. (2) A more objective weight value is obtained, which can avoid the analysis error caused by subjective judgment weight value. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ecological%20environment" title="ecological environment">ecological environment</a>, <a href="https://publications.waset.org/abstracts/search?q=coupling%20coordination%20degree" title=" coupling coordination degree"> coupling coordination degree</a>, <a href="https://publications.waset.org/abstracts/search?q=neural%20network" title=" neural network"> neural network</a>, <a href="https://publications.waset.org/abstracts/search?q=sustainable%20development" title=" sustainable development"> sustainable development</a> </p> <a href="https://publications.waset.org/abstracts/179164/understanding-the-conflict-between-ecological-environment-and-human-activities-in-the-process-of-urbanization" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/179164.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">82</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">690</span> Introduction of the Fluid-Structure Coupling into the Force Analysis Technique</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Oc%C3%A9ane%20Grosset">Océane Grosset</a>, <a href="https://publications.waset.org/abstracts/search?q=Charles%20P%C3%A9zerat"> Charles Pézerat</a>, <a href="https://publications.waset.org/abstracts/search?q=Jean-Hugh%20Thomas"> Jean-Hugh Thomas</a>, <a href="https://publications.waset.org/abstracts/search?q=Fr%C3%A9d%C3%A9ric%20Ablitzer"> Frédéric Ablitzer</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper presents a method to take into account the fluid-structure coupling into an inverse method, the Force Analysis Technique (FAT). The FAT method, also called RIFF method (Filtered Windowed Inverse Resolution), allows to identify the force distribution from local vibration field. In order to only identify the external force applied on a structure, it is necessary to quantify the fluid-structure coupling, especially in naval application, where the fluid is heavy. This method can be decomposed in two parts, the first one consists in identifying the fluid-structure coupling and the second one to introduced it in the FAT method to reconstruct the external force. Results of simulations on a plate coupled with a cavity filled with water are presented. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aeroacoustics" title="aeroacoustics">aeroacoustics</a>, <a href="https://publications.waset.org/abstracts/search?q=fluid-structure%20coupling" title=" fluid-structure coupling"> fluid-structure coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=inverse%20methods" title=" inverse methods"> inverse methods</a>, <a href="https://publications.waset.org/abstracts/search?q=naval" title=" naval"> naval</a>, <a href="https://publications.waset.org/abstracts/search?q=turbulent%20flow" title=" turbulent flow"> turbulent flow</a> </p> <a href="https://publications.waset.org/abstracts/58380/introduction-of-the-fluid-structure-coupling-into-the-force-analysis-technique" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/58380.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">519</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">689</span> Mutual Coupling Reduction between Patch Antenna Array Elements Using Metamaterial Z Shaped Resonators</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Oossama%20Tabbabi">Oossama Tabbabi</a>, <a href="https://publications.waset.org/abstracts/search?q=Mondher%20Labidi"> Mondher Labidi</a>, <a href="https://publications.waset.org/abstracts/search?q=Fethi%20Choubani"> Fethi Choubani</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20David"> J. David</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Modern wireless communication systems require compact design, low cost and simple structure antennas to insure reliability, agility, and high efficiency characteristics. This paper presents a microstrip antenna array designed for 8 GHz applications. To reduce the mutual coupling effects, a Z shape metamaterial structure was imprinted in the microstrip antenna array composed of two elements. Simulation results show the improvement of mutual coupling by adding Z shape metamaterial structure to the antenna substrate. The proposed structure reduces mutual coupling by 19 dB. The simulation has been performed by using HFSS simulator. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=antenna%20array" title="antenna array">antenna array</a>, <a href="https://publications.waset.org/abstracts/search?q=compact%20design" title=" compact design"> compact design</a>, <a href="https://publications.waset.org/abstracts/search?q=modern%20wireless%20communication" title=" modern wireless communication"> modern wireless communication</a>, <a href="https://publications.waset.org/abstracts/search?q=mutual%20coupling%20effects" title=" mutual coupling effects"> mutual coupling effects</a> </p> <a href="https://publications.waset.org/abstracts/42228/mutual-coupling-reduction-between-patch-antenna-array-elements-using-metamaterial-z-shaped-resonators" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/42228.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">343</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">688</span> Wave Interaction with Defects in Pressurized Composite Structures</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=R.%20K.%20Apalowo">R. K. Apalowo</a>, <a href="https://publications.waset.org/abstracts/search?q=D.%20Chronopoulos"> D. Chronopoulos</a>, <a href="https://publications.waset.org/abstracts/search?q=V.%20Thierry"> V. Thierry</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A wave finite element (WFE) and finite element (FE) based computational method is presented by which the dispersion properties as well as the wave interaction coefficients for one-dimensional structural system can be predicted. The structural system is discretized as a system comprising a number of waveguides connected by a coupling joint. Uniform nodes are ensured at the interfaces of the coupling element with each waveguide. Then, equilibrium and continuity conditions are enforced at the interfaces. Wave propagation properties of each waveguide are calculated using the WFE method and the coupling element is modelled using the FE method. The scattering of waves through the coupling element, on which damage is modelled, is determined by coupling the FE and WFE models. Furthermore, the central aim is to evaluate the effect of pressurization on the wave dispersion and scattering characteristics of the prestressed structural system compared to that which is not prestressed. Numerical case studies are exhibited for two waveguides coupled through a coupling joint. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Finite%20Element" title="Finite Element">Finite Element</a>, <a href="https://publications.waset.org/abstracts/search?q=Prestressed%20Structures" title=" Prestressed Structures"> Prestressed Structures</a>, <a href="https://publications.waset.org/abstracts/search?q=Wave%20Finite%20Element" title="Wave Finite Element">Wave Finite Element</a>, <a href="https://publications.waset.org/abstracts/search?q=Wave%20Propagation%20Properties" title=" Wave Propagation Properties"> Wave Propagation Properties</a>, <a href="https://publications.waset.org/abstracts/search?q=Wave%20Scattering%20Coefficients." title=" Wave Scattering Coefficients."> Wave Scattering Coefficients.</a> </p> <a href="https://publications.waset.org/abstracts/58482/wave-interaction-with-defects-in-pressurized-composite-structures" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/58482.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">295</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">687</span> Improving the Optoacoustic Signal by Monitoring the Changes of Coupling Medium</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=P.%20Prasannakumar">P. Prasannakumar</a>, <a href="https://publications.waset.org/abstracts/search?q=L.%20Myoung%20Young"> L. Myoung Young</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20Seung%20Kye"> G. Seung Kye</a>, <a href="https://publications.waset.org/abstracts/search?q=P.%20Sang%20Hun"> P. Sang Hun</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Chul%20Gyu"> S. Chul Gyu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, we discussed the coupling medium in the optoacoustic imaging. The coupling medium is placed between the scanned object and the ultrasound transducers. Water with varying temperature was used as the coupling medium. The water temperature is gradually varied between 25 to 40 degrees. This heating process is taken with care in order to avoid the bubble formation. Rise in the photoacoustic signal is noted through an unfocused transducer with frequency of 2.25 MHz as the temperature increases. The temperature rise is monitored using a NTC thermistor and the values in degrees are calculated using an embedded evaluation kit. Also the temperature is transmitted to PC through a serial communication. All these processes are synchronized using a trigger signal from the laser source. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=embedded" title="embedded">embedded</a>, <a href="https://publications.waset.org/abstracts/search?q=optoacoustic" title=" optoacoustic"> optoacoustic</a>, <a href="https://publications.waset.org/abstracts/search?q=ultrasound" title=" ultrasound "> ultrasound </a>, <a href="https://publications.waset.org/abstracts/search?q=unfocused%20transducer" title=" unfocused transducer"> unfocused transducer</a> </p> <a href="https://publications.waset.org/abstracts/72669/improving-the-optoacoustic-signal-by-monitoring-the-changes-of-coupling-medium" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/72669.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">349</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">686</span> Carbonylative Cross Coupling of 2-Bromopyridine with Different Boronic Acids under Carbon Monoxide Atmosphere </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=N.%20Touj">N. Touj</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Sauthier"> M. Sauthier</a>, <a href="https://publications.waset.org/abstracts/search?q=L.%20Mansour"> L. Mansour</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Hamdi"> N. Hamdi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The palladium NHC complexes are one of the most interesting and widely investigated complexes in different catalytic transformations, especially C–C bond. Thus, the use of N-heterocyclic carbenes associated with palladium has been reported as efficient catalysts for the carbonyl coupling under mild and varied conditions. Herein, we report the synthesis, characterization, and cytotoxic activities of two new families of benzimidazolium salts. Then we studied the use of this class of benzimidazolium salts as a ligand in the carbonylative cross-coupling of 2-bromopyridine with different boronic acids under CO atmosphere to form unsymmetrical arylpyridine ketones. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=NHC-Pd%28II%29%20catalysts" title="NHC-Pd(II) catalysts">NHC-Pd(II) catalysts</a>, <a href="https://publications.waset.org/abstracts/search?q=carbonylative%20Suzuki%20cross-coupling%20reaction" title=" carbonylative Suzuki cross-coupling reaction"> carbonylative Suzuki cross-coupling reaction</a>, <a href="https://publications.waset.org/abstracts/search?q=arylboronic%20acids" title=" arylboronic acids"> arylboronic acids</a>, <a href="https://publications.waset.org/abstracts/search?q=2-bromopyridine" title=" 2-bromopyridine"> 2-bromopyridine</a>, <a href="https://publications.waset.org/abstracts/search?q=unsymmetrical%20arylpyridine%20ketones" title=" unsymmetrical arylpyridine ketones"> unsymmetrical arylpyridine ketones</a> </p> <a href="https://publications.waset.org/abstracts/131435/carbonylative-cross-coupling-of-2-bromopyridine-with-different-boronic-acids-under-carbon-monoxide-atmosphere" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/131435.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">163</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">685</span> Effect of Coupling Media on Ultrasonic Pulse Velocity in Concrete: A Preliminary Investigation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sura%20Al-Khafaji">Sura Al-Khafaji</a>, <a href="https://publications.waset.org/abstracts/search?q=Phil%20Purnell"> Phil Purnell</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Measurement of the ultrasonic pulse velocity (UPV) is an important tool in diagnostic examination of concrete. In this method piezoelectric transducers are normally held in direct contact with the concrete surface. The current study aims to test the hypothesis that a preferential coupling effect might exist i.e. that the speed of sound measured depends on the couplant used. In this study, different coupling media of varying acoustic impedance were placed between the transducers and concrete samples made with constant aggregate content but with different compressive strengths. The preliminary results show that using coupling materials (both solid and a range of liquid substances) has an effect on the pulse velocity measured in a given concrete. The effect varies depending on the material used. The UPV measurements with solid coupling were higher than these from the liquid coupling at all strength levels. The tests using couplants generally recorded lower UPV values than the conventional test, except when carbon fiber composite was used, which retuned higher values. Analysis of variances (ANOVA) was performed to confirm that there are statistically significant differences between the measurements recorded using a conventional system and a coupled system. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=compressive%20strength" title="compressive strength">compressive strength</a>, <a href="https://publications.waset.org/abstracts/search?q=coupling%20effect" title=" coupling effect"> coupling effect</a>, <a href="https://publications.waset.org/abstracts/search?q=statistical%20analysis" title=" statistical analysis"> statistical analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=ultrasonic" title=" ultrasonic"> ultrasonic</a> </p> <a href="https://publications.waset.org/abstracts/40930/effect-of-coupling-media-on-ultrasonic-pulse-velocity-in-concrete-a-preliminary-investigation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40930.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">321</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">684</span> Cross Coupling Sliding Mode Synchronization Control of Dual-Driving Feed System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hong%20Lu">Hong Lu</a>, <a href="https://publications.waset.org/abstracts/search?q=Wei%20Fan"> Wei Fan</a>, <a href="https://publications.waset.org/abstracts/search?q=Yongquan%20Zhang"> Yongquan Zhang</a>, <a href="https://publications.waset.org/abstracts/search?q=Junbo%20Zhang"> Junbo Zhang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A cross coupling sliding synchronization control strategy is proposed for the dual-driving feed system. This technology will minimize the position error oscillation and achieve the precise synchronization performance in the high speed and high precision drive system, especially some high speed and high precision machine. Moreover, a cross coupling compensation matrix is provided to offset the mismatched disturbance and the disturbance observer is established to eliminate the chattering phenomenon. Performance comparisons of proposed dual-driving cross coupling sliding mode control (CCSMC), normal cross coupling control （CCC） strategy with PID control, and electronic virtual main shaft control (EVMSC) strategy with SMC control are investigated by simulation and a dual-driving control system; the results show the effectiveness of the proposed control scheme. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cross%20coupling%20matrix" title="cross coupling matrix">cross coupling matrix</a>, <a href="https://publications.waset.org/abstracts/search?q=dual%20motors" title=" dual motors"> dual motors</a>, <a href="https://publications.waset.org/abstracts/search?q=synchronization%20control" title=" synchronization control"> synchronization control</a>, <a href="https://publications.waset.org/abstracts/search?q=sliding%20mode%20control" title=" sliding mode control"> sliding mode control</a> </p> <a href="https://publications.waset.org/abstracts/40647/cross-coupling-sliding-mode-synchronization-control-of-dual-driving-feed-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40647.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">365</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">683</span> Structural, Magnetic and Magnetocaloric Properties of Iron-Doped Nd₀.₆Sr₀.₄MnO₃ Perovskite</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ismail%20Al-Yahmadi">Ismail Al-Yahmadi</a>, <a href="https://publications.waset.org/abstracts/search?q=Abbasher%20Gismelseed"> Abbasher Gismelseed</a>, <a href="https://publications.waset.org/abstracts/search?q=Fatma%20Al-Mammari"> Fatma Al-Mammari</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20Al-Rawas"> Ahmed Al-Rawas</a>, <a href="https://publications.waset.org/abstracts/search?q=Ali%20Yousif"> Ali Yousif</a>, <a href="https://publications.waset.org/abstracts/search?q=Imaddin%20Al-Omari"> Imaddin Al-Omari</a>, <a href="https://publications.waset.org/abstracts/search?q=Hisham%20Widatallah"> Hisham Widatallah</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Elzain"> Mohamed Elzain</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The influence of Fe-doping on the structural, magnetic and magnetocaloric properties of Nd₀.₆Sr₀.₄FeₓMn₁₋ₓO₃ (0≤ x ≤0.5) were investigated. The samples were synthesized by auto-combustion Sol-Gel method. The phase purity, crystallinity, and the structural properties for all prepared samples were examined by X-ray diffraction. XRD refinement indicates that the samples are crystallized in the orthorhombic single-phase with Pnma space group. Temperature dependence of magnetization measurements under a magnetic applied field of 0.02 T reveals that the samples with (x=0.0, 0.1, 0.2 and 0.3) exhibit a paramagnetic (PM) to ferromagnetic (FM) transition with decreasing temperature. The Curie temperature decreased with increasing Fe content from 256 K for x =0.0 to 80 K for x =0.3 due to increasing of antiferromagnetic superexchange (SE) interaction coupling. Moreover, the magnetization as a function of applied magnetic field (M-H) curves was measured at 2 K, and 300 K. the results of such measurements confirm the temperature dependence of magnetization measurements. The magnetic entropy change|∆SM | was evaluated using Maxwell's relation. The maximum values of the magnetic entropy change |-∆SMax |for x=0.0, 0.1, 0.2, 0.3 are found to be 15.35, 5.13, 3.36, 1.08 J/kg.K for an applied magnetic field of 9 T. Our result on magnetocaloric properties suggests that the parent sample Nd₀.₆Sr₀.₄MnO₃ could be a good refrigerant for low-temperature magnetic refrigeration. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=manganite%20perovskite" title="manganite perovskite">manganite perovskite</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetocaloric%20effect" title=" magnetocaloric effect"> magnetocaloric effect</a>, <a href="https://publications.waset.org/abstracts/search?q=X-ray%20diffraction" title=" X-ray diffraction"> X-ray diffraction</a>, <a href="https://publications.waset.org/abstracts/search?q=relative%20cooling%20power" title=" relative cooling power"> relative cooling power</a> </p> <a href="https://publications.waset.org/abstracts/109346/structural-magnetic-and-magnetocaloric-properties-of-iron-doped-nd06sr04mno3-perovskite" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/109346.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">159</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">682</span> Spectrophotometric Determination of Phenylephrine Hydrochloride by Coupling with Diazotized 2,4-Dinitroaniline</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sulaiman%20Gafar%20Muhamad">Sulaiman Gafar Muhamad</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A rapid spectrophotometric method for the micro-determination of phenylephrine-HCl (PHE) has been developed. The proposed method involves the coupling of phenylephrine-HCl with diazotized 2,4-dinitroaniline in alkaline medium at λmax 455 nm. Under the present optimum condition, Beer’s law was obeyed in the range of 1.0-20 μg/ml of PHE with molar absorptivity of 1.915 ×104 l. mol-1.cm-1, with a relative error of 0.015 and a relative standard deviation of 0.024%. The current method has been applied successfully to estimate phenylephrine-HCl in pharmaceutical preparations (nose drop and syrup). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=diazo-coupling" title="diazo-coupling">diazo-coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=2" title=" 2"> 2</a>, <a href="https://publications.waset.org/abstracts/search?q=4-dinitroaniline" title="4-dinitroaniline">4-dinitroaniline</a>, <a href="https://publications.waset.org/abstracts/search?q=phenylephrine-HCl" title=" phenylephrine-HCl"> phenylephrine-HCl</a>, <a href="https://publications.waset.org/abstracts/search?q=spectrophotometry" title=" spectrophotometry"> spectrophotometry</a> </p> <a href="https://publications.waset.org/abstracts/53006/spectrophotometric-determination-of-phenylephrine-hydrochloride-by-coupling-with-diazotized-24-dinitroaniline" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/53006.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">257</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">681</span> Effect of Interlayer Coupling in Co/Al2O3/Co</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Niru%20Chowdhury">Niru Chowdhury</a>, <a href="https://publications.waset.org/abstracts/search?q=Subhankar%20Bedanta"> Subhankar Bedanta</a>, <a href="https://publications.waset.org/abstracts/search?q=Alexander%20Weber"> Alexander Weber</a>, <a href="https://publications.waset.org/abstracts/search?q=Thomas%20Brueckel"> Thomas Brueckel</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We show the effect of interlayer coupling on magnetization reversal in purely dipolar coupled magnetic multilayers. Longitudinal magneto-optic Kerr microscopy (LMOKE) has been performed on [Co(10nm)/Al2O3(t)/Co(10nm)] for various thicknesses of Al2O3(t). We will show that inter-layer coupling interactions lead to layer-by-layer reversal in the magnetic multilayers. Also transverse component of magnetization was observed for higher thickness of the spacer layer. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Interlayer%20coupling" title="Interlayer coupling">Interlayer coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=Magnetic%20domains" title=" Magnetic domains"> Magnetic domains</a>, <a href="https://publications.waset.org/abstracts/search?q=Magneto%20%E2%80%93%20Optic%20Kerr%20effect%20microscopy" title=" Magneto – Optic Kerr effect microscopy"> Magneto – Optic Kerr effect microscopy</a>, <a href="https://publications.waset.org/abstracts/search?q=Magnetization%20reversal" title=" Magnetization reversal"> Magnetization reversal</a>, <a href="https://publications.waset.org/abstracts/search?q=Magnetic%20thin%20film" title=" Magnetic thin film"> Magnetic thin film</a> </p> <a href="https://publications.waset.org/abstracts/17304/effect-of-interlayer-coupling-in-coal2o3co" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/17304.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">399</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">680</span> Stability of a Self-Excited Machine Due to the Mechanical Coupling </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Soltan%20Rezaee">M. Soltan Rezaee</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20R.%20Ghazavi"> M. R. Ghazavi</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Najafi"> A. Najafi</a>, <a href="https://publications.waset.org/abstracts/search?q=W.-H.%20Liao"> W.-H. Liao</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Generally, different rods in shaft systems can be misaligned based on the mechanical system usages. These rods can be linked together via U-coupling easily. The system is self-stimulated and may cause instabilities due to the inherent behavior of the coupling. In this study, each rod includes an elastic shaft with an angular stiffness and structural damping. Moreover, the mass of shafts is considered via attached solid disks. The impact of the system architecture and shaft mass on the instability of such mechanism are studied. Stability charts are plotted via a method based on Floquet theory. Eventually, the unstable points have been found and analyzed in detail. The results show that stabilizing the driveline is feasible by changing the system characteristics which include shaft mass and architecture. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=coupling" title="coupling">coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=mechanical%20systems" title=" mechanical systems"> mechanical systems</a>, <a href="https://publications.waset.org/abstracts/search?q=oscillations" title=" oscillations"> oscillations</a>, <a href="https://publications.waset.org/abstracts/search?q=rotating%20shafts" title=" rotating shafts"> rotating shafts</a> </p> <a href="https://publications.waset.org/abstracts/98061/stability-of-a-self-excited-machine-due-to-the-mechanical-coupling" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/98061.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">180</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">679</span> Ultrastrong Coupling of CdZnS/ZnS Quantum Dots and Breathing Plasmons in Aluminum Metal-Insulator-Metal Nanocavities in Near-Ultraviolet Spectrum</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Li%20Li">Li Li</a>, <a href="https://publications.waset.org/abstracts/search?q=Lei%20Wang"> Lei Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=Chenglin%20Du"> Chenglin Du</a>, <a href="https://publications.waset.org/abstracts/search?q=Mengxin%20Ren"> Mengxin Ren</a>, <a href="https://publications.waset.org/abstracts/search?q=Xinzheng%20Zhang"> Xinzheng Zhang</a>, <a href="https://publications.waset.org/abstracts/search?q=Wei%20Cai"> Wei Cai</a>, <a href="https://publications.waset.org/abstracts/search?q=Jingjun%20Xu"> Jingjun Xu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Strong coupling between excitons of quantum dots and plasmons in nanocavites can be realized at room temperature due to the strong confinement of the plasmon fields, which offers building blocks for quantum information systems or ultralow-power switches and lasers. In this work, by using cathodoluminescence, ultrastrong coupling with Rabi splitting above 1 eV between breathing plasmons in Aluminum metal-insulator-metal (MIM) cavity and excited state of CdZnS/ZnS quantum dots was reported in near-UV spectrum. Analytic analysis and full-wave electromagnetic simulations provide the evidence for the strong coupling and confirm the hybridization of the QDs exciton and LSP breathing mode. This study opens the way for new emerging applications based on strongly coupled light-matter states all over the visible region down to ultra-violet frequencies. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=breathing%20mode" title="breathing mode">breathing mode</a>, <a href="https://publications.waset.org/abstracts/search?q=plasmonics" title=" plasmonics"> plasmonics</a>, <a href="https://publications.waset.org/abstracts/search?q=quantum%20dot" title=" quantum dot"> quantum dot</a>, <a href="https://publications.waset.org/abstracts/search?q=strong%20coupling" title=" strong coupling"> strong coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=ultraviolet" title=" ultraviolet"> ultraviolet</a> </p> <a href="https://publications.waset.org/abstracts/105253/ultrastrong-coupling-of-cdznszns-quantum-dots-and-breathing-plasmons-in-aluminum-metal-insulator-metal-nanocavities-in-near-ultraviolet-spectrum" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/105253.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">199</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">678</span> Lattice Dynamics of (ND4Br)x(KBr)1-x Mixed Crystals</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Alpana%20Tiwari">Alpana Tiwari</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20K.%20Gaur"> N. K. Gaur</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We have incorporated the translational rotational (TR) coupling effects in the framework of three body force shell model (TSM) to develop an extended TSM (ETSM). The dynamical matrix of ETSM has been applied to compute the phonon frequencies of orientationally disordered mixed crystal (ND4Br)x(KBr)1-x in (q00), (qq0) and (qqq) symmetry directions for compositions 0.10≤x≤0.50 at T=300K.These frequencies are plotted as a function of wave vector k. An unusual acoustic mode softening is found along symmetry directions (q00) and (qq0) as a result of translation-rotation coupling. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=orientational%20glass" title="orientational glass">orientational glass</a>, <a href="https://publications.waset.org/abstracts/search?q=phonons" title=" phonons"> phonons</a>, <a href="https://publications.waset.org/abstracts/search?q=TR-coupling" title=" TR-coupling"> TR-coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=lattice%20dynamics" title=" lattice dynamics"> lattice dynamics</a> </p> <a href="https://publications.waset.org/abstracts/6479/lattice-dynamics-of-nd4brxkbr1-x-mixed-crystals" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/6479.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">305</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">677</span> QI Wireless Charging a Scope of Magnetic Inductive Coupling </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sreenesh%20Shashidharan">Sreenesh Shashidharan</a>, <a href="https://publications.waset.org/abstracts/search?q=Umesh%20Gaikwad"> Umesh Gaikwad</a> </p> <p class="card-text"><strong>Abstract:</strong></p> QI or 'Chee' which is an interface standard for inductive electrical power transfer over distances of up to 4 cm (1.6 inches). The Qi system comprises a power transmission pad and a compatible receiver in a portable device which is placed on top of the power transmission pad, which charges using the principle of electromagnetic induction. An alternating current is passed through the transmitter coil, generating a magnetic field. This, in turn, induces a voltage in the receiver coil; this can be used to power a mobile device or charge a battery. The efficiency of the power transfer depends on the coupling (k) between the inductors and their quality (Q) The coupling is determined by the distance between the inductors (z) and the relative size (D2 /D). The coupling is further determined by the shape of the coils and the angle between them. If the receiver coil is at a certain distance to the transmitter coil, only a fraction of the magnetic flux, which is generated by the transmitter coil, penetrates the receiver coil and contributes to the power transmission. The more flux reaches the receiver, the better the coils are coupled. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=inductive%20electric%20power" title="inductive electric power">inductive electric power</a>, <a href="https://publications.waset.org/abstracts/search?q=electromagnetic%20induction" title=" electromagnetic induction"> electromagnetic induction</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetic%20flux" title=" magnetic flux"> magnetic flux</a>, <a href="https://publications.waset.org/abstracts/search?q=coupling" title=" coupling"> coupling</a> </p> <a href="https://publications.waset.org/abstracts/20622/qi-wireless-charging-a-scope-of-magnetic-inductive-coupling" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/20622.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">732</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">676</span> Synthesis, Characterization of Pd Nanoparticle Supported on Amine-Functionalized Graphene and Its Catalytic Activity for Suzuki Coupling Reaction</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Surjyakanta%20Rana">Surjyakanta Rana</a>, <a href="https://publications.waset.org/abstracts/search?q=Sreekantha%20B.%20Jonnalagadda"> Sreekantha B. Jonnalagadda</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Synthesis of well distributed Pd nanoparticles (3 – 7 nm) on organo amine-functionalized graphene is reported, which demonstrated excellent catalytic activity towards Suzuki coupling reaction. The active material was characterized by X-ray diffraction (XRD), BET surface area, X-ray photoelectron spectra (XPS), Fourier-transfer infrared spectroscopy (FTIR), Raman spectra, Scanning electron microscope (SEM), Transmittance electron microscopy (TEM) analysis and HRTEM. FT-IR revealed that the organic amine functional group was successfully grafted onto the graphene oxide surface. The formation of palladium nanoparticles was confirmed by XPS, TEM and HRTEM techniques. The catalytic activity in the coupling reaction was superb with 100% conversion and 98 % yield and also activity remained almost unaltered up to six cycles. Typically, an extremely high turnover frequency of 185,078 h-1 is observed in the C-C Suzuki coupling reaction using organo di-amine functionalized graphene as catalyst. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Di-amine" title="Di-amine">Di-amine</a>, <a href="https://publications.waset.org/abstracts/search?q=graphene" title=" graphene"> graphene</a>, <a href="https://publications.waset.org/abstracts/search?q=Pd%20nanoparticle" title=" Pd nanoparticle"> Pd nanoparticle</a>, <a href="https://publications.waset.org/abstracts/search?q=suzuki%20coupling" title=" suzuki coupling"> suzuki coupling</a> </p> <a href="https://publications.waset.org/abstracts/31977/synthesis-characterization-of-pd-nanoparticle-supported-on-amine-functionalized-graphene-and-its-catalytic-activity-for-suzuki-coupling-reaction" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/31977.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">375</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">675</span> Coupling of Two Discretization Schemes for the Lattice Boltzmann Equation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tobias%20Horstmann">Tobias Horstmann</a>, <a href="https://publications.waset.org/abstracts/search?q=Thomas%20Le%20Garrec"> Thomas Le Garrec</a>, <a href="https://publications.waset.org/abstracts/search?q=Daniel-Ciprian%20Mincu"> Daniel-Ciprian Mincu</a>, <a href="https://publications.waset.org/abstracts/search?q=Emmanuel%20L%C3%A9v%C3%AAque"> Emmanuel Lévêque</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Despite the efficiency and low dissipation of the stream-collide formulation of the Lattice Boltzmann (LB) algorithm, which is nowadays implemented in many commercial LBM solvers, there are certain situations, e.g. mesh transition, in which a classical finite-volume or finite-difference formulation of the LB algorithm still bear advantages. In this paper, we present an algorithm that combines the node-based streaming of the distribution functions with a second-order finite volume discretization of the advection term of the BGK-LB equation on a uniform D2Q9 lattice. It is shown that such a coupling is possible for a multi-domain approach as long as the overlap, or buffer zone, between two domains, is achieved on at least 2Δx. This also implies that a direct coupling (without buffer zone) of a stream-collide and finite-volume LB algorithm on a single grid is not stable. The critical parameter in the coupling is the CFL number equal to 1 that is imposed by the stream-collide algorithm. Nevertheless, an explicit filtering step on the finite-volume domain can stabilize the solution. In a further investigation, we demonstrate how such a coupling can be used for mesh transition, resulting in an intrinsic conservation of mass over the interface. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=algorithm%20coupling" title="algorithm coupling">algorithm coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20volume%20formulation" title=" finite volume formulation"> finite volume formulation</a>, <a href="https://publications.waset.org/abstracts/search?q=grid%20refinement" title=" grid refinement"> grid refinement</a>, <a href="https://publications.waset.org/abstracts/search?q=Lattice%20Boltzmann%20method" title=" Lattice Boltzmann method"> Lattice Boltzmann method</a> </p> <a href="https://publications.waset.org/abstracts/61400/coupling-of-two-discretization-schemes-for-the-lattice-boltzmann-equation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/61400.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">378</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">674</span> A Photoredox (C)sp³-(C)sp² Coupling Method Comparison Study</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shasline%20Gedeon">Shasline Gedeon</a>, <a href="https://publications.waset.org/abstracts/search?q=Tiffany%20W.%20Ardley"> Tiffany W. Ardley</a>, <a href="https://publications.waset.org/abstracts/search?q=Ying%20Wang"> Ying Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=Nathan%20J.%20Gesmundo"> Nathan J. Gesmundo</a>, <a href="https://publications.waset.org/abstracts/search?q=Katarina%20A.%20Sarris"> Katarina A. Sarris</a>, <a href="https://publications.waset.org/abstracts/search?q=Ana%20L.%20Aguirre"> Ana L. Aguirre</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Drug discovery and delivery involve drug targeting, an approach that helps find a drug against a chosen target through high throughput screening and other methods by way of identifying the physical properties of the potential lead compound. Physical properties of potential drug candidates have been an imperative focus since the unveiling of Lipinski's Rule of 5 for oral drugs. Throughout a compound's journey from discovery, clinical phase trials, then becoming a classified drug on the market, the desirable properties are optimized while minimizing/eliminating toxicity and undesirable properties. In the pharmaceutical industry, the ability to generate molecules in parallel with maximum efficiency is a substantial factor achieved through sp²-sp² carbon coupling reactions, e.g., Suzuki Coupling reactions. These reaction types allow for the increase of aromatic fragments onto a compound. More recent literature has found benefits to decreasing aromaticity, calling for more sp³-sp² carbon coupling reactions instead. The objective of this project is to provide a comparison between various sp³-sp² carbon coupling methods and reaction conditions, collecting data on production of the desired product. There were four different coupling methods being tested amongst three cores and 4-5 installation groups per method; each method ran under three distinct reaction conditions. The tested methods include the Photoredox Decarboxylative Coupling, the Photoredox Potassium Alkyl Trifluoroborate (BF3K) Coupling, the Photoredox Cross-Electrophile (PCE) Coupling, and the Weix Cross-Electrophile (WCE) Coupling. The results concluded that the Decarboxylative method was very difficult in yielding product despite the several literature conditions chosen. The BF3K and PCE methods produced competitive results. Amongst the two Cross-Electrophile coupling methods, the Photoredox method surpassed the Weix method on numerous accounts. The results will be used to build future libraries. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=drug%20discovery" title="drug discovery">drug discovery</a>, <a href="https://publications.waset.org/abstracts/search?q=high%20throughput%20chemistry" title=" high throughput chemistry"> high throughput chemistry</a>, <a href="https://publications.waset.org/abstracts/search?q=photoredox%20chemistry" title=" photoredox chemistry"> photoredox chemistry</a>, <a href="https://publications.waset.org/abstracts/search?q=sp%C2%B3-sp%C2%B2%20carbon%20coupling%20methods" title=" sp³-sp² carbon coupling methods"> sp³-sp² carbon coupling methods</a> </p> <a href="https://publications.waset.org/abstracts/122791/a-photoredox-csp3-csp2-coupling-method-comparison-study" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/122791.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">144</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">673</span> The Study on Blast Effect of Polymer Gel by Trazul Lead Block Test and Concrete Block Test</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Young-Hun%20Ko">Young-Hun Ko</a>, <a href="https://publications.waset.org/abstracts/search?q=Seung-Jun%20Kim"> Seung-Jun Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Khaqan%20Baluch"> Khaqan Baluch</a>, <a href="https://publications.waset.org/abstracts/search?q=Hyung-%20Sik%20Yang"> Hyung- Sik Yang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, the polymer gel was used as coupling material in a blasting hole and its comparison was made with other coupling materials like sand, water, and air. Trazul lead block test and AUTODYN numerical analysis were conducted to analyze the effects of the coupling materials on the intensity of the explosion, as well as the verification tests were conducted by using concrete block test. The emulsion explosives were used in decoupling conditions, sand, water, and polymer gel were used as the coupling materials. The lead block test and the numerical analysis showed that the expansion of the blast hole in the lead block was similar to that of the water and gelatin and followed by sand and air conditions. The validation of concrete block test result showed the similar result as Trazul lead block test and the explosion strength was measured at 0.8 for polymer gel, 0.7 for sand, and 0.6 for no coupling material, in comparison to the full charge (1.0) case. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Trazul%20lead%20block%20test" title="Trazul lead block test">Trazul lead block test</a>, <a href="https://publications.waset.org/abstracts/search?q=AUTODYN%20numerical%20analysis" title=" AUTODYN numerical analysis"> AUTODYN numerical analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=coupling%20material" title=" coupling material"> coupling material</a>, <a href="https://publications.waset.org/abstracts/search?q=polymer%20gel" title=" polymer gel"> polymer gel</a>, <a href="https://publications.waset.org/abstracts/search?q=soil%20covering%20concrete%20block%20explosion%20test" title=" soil covering concrete block explosion test "> soil covering concrete block explosion test </a> </p> <a href="https://publications.waset.org/abstracts/89043/the-study-on-blast-effect-of-polymer-gel-by-trazul-lead-block-test-and-concrete-block-test" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/89043.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">300</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">672</span> A Detailed Computational Investigation into Copper Catalyzed Sonogashira Coupling Reaction</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=C.%20Rajalakshmi">C. Rajalakshmi</a>, <a href="https://publications.waset.org/abstracts/search?q=Vibin%20Ipe%20Thomas"> Vibin Ipe Thomas</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Sonogashira coupling reactions are widely employed in the synthesis of molecules of biological and pharmaceutical importance. Copper catalyzed Sonogashira coupling reactions are gaining importance owing to the low cost and less toxicity of copper as compared to the palladium catalyst. In the present work, a detailed computational study has been carried out on the Sonogashira coupling reaction between aryl halides and terminal alkynes catalyzed by Copper (I) species with trans-1, 2 Diaminocyclohexane as ligand. All calculations are performed at Density Functional Theory (DFT) level, using the hybrid Becke3LYP functional. Cu and I atoms are described using an effective core potential (LANL2DZ) for the inner electrons and its associated double-ζ basis set for the outer electrons. For all other atoms, 6-311G+* basis set is used. We have identified that the active catalyst species is a neutral 3-coordinate trans-1,2 diaminocyclohexane ligated Cu (I) alkyne complex and found that the oxidative addition and reductive elimination occurs in a single step proceeding through one transition state. This is owing to the ease of reductive elimination involving coupling of Csp2-Csp carbon atoms and the less stable Cu (III) intermediate. This shows the mechanism of copper catalyzed Sonogashira coupling reactions are quite different from those catalyzed by palladium. To gain further insights into the mechanism, substrates containing various functional groups are considered in our study to traverse their effect on the feasibility of the reaction. We have also explored the effect of ligand on the catalytic cycle of the coupling reaction. The theoretical results obtained are in good agreement with the experimental observation. This shows the relevance of a combined theoretical and experimental approach for rationally improving the cross-coupling reaction mechanisms. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=copper%20catalysed" title="copper catalysed">copper catalysed</a>, <a href="https://publications.waset.org/abstracts/search?q=density%20functional%20theory" title=" density functional theory"> density functional theory</a>, <a href="https://publications.waset.org/abstracts/search?q=reaction%20mechanism" title=" reaction mechanism"> reaction mechanism</a>, <a href="https://publications.waset.org/abstracts/search?q=Sonogashira%20coupling" title=" Sonogashira coupling"> Sonogashira coupling</a> </p> <a href="https://publications.waset.org/abstracts/117732/a-detailed-computational-investigation-into-copper-catalyzed-sonogashira-coupling-reaction" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/117732.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">116</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">671</span> An Efficient Green Catalyst for Chemo-Selectiveoxidative Coupling of Thiols</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=E.%20Kolvari">E. Kolvari</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Koukabi"> N. Koukabi</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Sabet"> A. Sabet</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Fakhraee"> A. Fakhraee</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Ramezanpour"> M. Ramezanpour</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A green and efficient method for oxidation of thiols to the corresponding disulfides is reported using free nano-iron oxide in the H2O2 and methanol as solvent at room tempereture. H2O2 is anoxidant for S-S coupling variety aromatic of thiols to corresponding disulfide in the presence of supported iron oxide as recoverable catalyst. This reaction is clean, fast, mild and easy work-up with no side reaction. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=thiol" title="thiol">thiol</a>, <a href="https://publications.waset.org/abstracts/search?q=disulfide" title=" disulfide"> disulfide</a>, <a href="https://publications.waset.org/abstracts/search?q=free%20nano-iron%20oxide" title=" free nano-iron oxide"> free nano-iron oxide</a>, <a href="https://publications.waset.org/abstracts/search?q=H2O2" title=" H2O2"> H2O2</a>, <a href="https://publications.waset.org/abstracts/search?q=oxidation" title=" oxidation"> oxidation</a>, <a href="https://publications.waset.org/abstracts/search?q=coupling" title=" coupling"> coupling</a> </p> <a href="https://publications.waset.org/abstracts/11505/an-efficient-green-catalyst-for-chemo-selectiveoxidative-coupling-of-thiols" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/11505.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">353</span> </span> </div> </div> <ul class="pagination"> <li class="page-item disabled"><span class="page-link">&lsaquo;</span></li> <li class="page-item active"><span class="page-link">1</span></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=super-exchange%20coupling&page=2">2</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=super-exchange%20coupling&page=3">3</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=super-exchange%20coupling&page=4">4</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=super-exchange%20coupling&page=5">5</a></li> <li class="page-item"><a class="page-link" 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