arXiv - PHYS - Classical Physics最新文献_第4页

The treatment of conformable electromagnetic theory of Maxwell as a singular system 将麦克斯韦的符合电磁理论作为奇异系统处理

arXiv - PHYS - Classical Physics Pub Date : 2024-08-03 DOI: arxiv-2408.01881

Eqab. M. Rabei, Mohamed Ghaleb Al-Masaeed, Dumitru Baleanu

引用次数: 0

Through-Thickness Modelling of Metal Rolling using Multiple-Scale Asymptotics 利用多尺度渐近法建立金属轧制的厚度模型

arXiv - PHYS - Classical Physics Pub Date : 2024-08-02 DOI: arxiv-2408.01347

Mozhdeh Erfanian, Edward James Brambley, Francis Flanagan, Doireann O'Kiely, Alison O'Connor

{"title":"Through-Thickness Modelling of Metal Rolling using Multiple-Scale Asymptotics","authors":"Mozhdeh Erfanian, Edward James Brambley, Francis Flanagan, Doireann O'Kiely, Alison O'Connor","doi":"arxiv-2408.01347","DOIUrl":"https://doi.org/arxiv-2408.01347","url":null,"abstract":"A new semi-analytic model of the metal rolling processes is presented and\u0000validated against finite element simulations. The model generalizes the\u0000classical Slab Method of cold rolling, and for the first time is able to\u0000predict the through-thickness stress and strain oscillations present in\u0000long-aspect-ratio roll gaps. The model is based on the asymptotic Method of\u0000Multiple-Scales, with the systematic assumptions of a long thin roll gap and a\u0000comparably small Coulomb friction coefficient. The leading-order solution\u0000varies only on the long length scale of the roll gap length $hat{ell}$, and\u0000matches with Slab Theory. The next-order correction varies on both the long\u0000length scale and the short length scale of the workpiece thickness\u0000$2hat{h}_0$, and reveals rapid stress and strain oscillation both in the\u0000rolling direction and through-thickness. For this initial derivation, the model\u0000assumes a rigid perfectly-plastic material behaviour. Despite these strong\u0000assumptions, the model is shown to compare well with finite element simulations\u0000using realistic elasticity and hardening material models. These assumptions\u0000facilitate the simplest possible model to provide a foundational understanding\u0000of the complex through-thickness behaviour observed in the finite element\u0000simulations, while requiring an order of only seconds to compute. Matlab code\u0000for evaluating the model is provided in the supplementary material.","PeriodicalId":501482,"journal":{"name":"arXiv - PHYS - Classical Physics","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141938543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetodynamics of few-nanoparticle chains 少纳米粒子链的磁动力学

arXiv - PHYS - Classical Physics Pub Date : 2024-08-02 DOI: arxiv-2408.01561

Thinh Q. Bui, Samuel D. Oberdick, Frank M. Abel, Michael J. Donahue, Klaus N. Quelhas, Cindi L. Dennis, Thomas Cleveland, Yanxin Liu, Solomon I. Woods

{"title":"Magnetodynamics of few-nanoparticle chains","authors":"Thinh Q. Bui, Samuel D. Oberdick, Frank M. Abel, Michael J. Donahue, Klaus N. Quelhas, Cindi L. Dennis, Thomas Cleveland, Yanxin Liu, Solomon I. Woods","doi":"arxiv-2408.01561","DOIUrl":"https://doi.org/arxiv-2408.01561","url":null,"abstract":"In recent years, there has been increasing interest in the understanding and\u0000application of nanoparticle assemblies driven by external fields. Although\u0000these systems can exhibit marked transitions in behavior compared to\u0000non-interacting counterparts, it has often proven challenging to connect their\u0000dynamics with underlying physical mechanisms or even to verifiably establish\u0000their structure under realistic experimental conditions. We have studied\u0000colloidal iron oxide nanoparticles that assemble into ordered, few-particle\u0000linear chains under the influence of oscillating and pulsed magnetic fields.\u0000Cryo-EM has been used to flash freeze and image the structures formed by\u0000oscillatory drive fields, and magnetic relaxometry has been used to extract the\u0000multiple time constants associated with magnetic switching of the short chains.\u0000Armed with the physical structure from cryo-EM and the field-dependent\u0000switching times from magnetic measurements, we have conducted extensive\u0000micromagnetic simulations, revealing probable mechanisms for each time constant\u0000regime spanning $10^{9}$ in time and how switching develops from individual\u0000particles to entire chains. These types of magnetic nanomaterials have great\u0000potential for biomedical technologies, particularly magnetic particle imaging\u0000and hyperthermia, and rigorous elucidation of their physics will hasten their\u0000optimization.","PeriodicalId":501482,"journal":{"name":"arXiv - PHYS - Classical Physics","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141938441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurements of Gravitational Attractions at small Accelerations 小加速度下引力吸引力的测量结果

arXiv - PHYS - Classical Physics Pub Date : 2024-07-31 DOI: arxiv-2407.21482

W. BartelDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany, C. W. ElversDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany, L. JönssonLund University, Sweden, G. KempfDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany, H. KrauseUniversität Hamburg, B. LoehrDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany, E. LohrmannUniversität Hamburg, H. MeyerBergische Universität, Wuppertal, P. SteffenDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany, E. WuenschDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany

{"title":"Measurements of Gravitational Attractions at small Accelerations","authors":"W. BartelDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany, C. W. ElversDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany, L. JönssonLund University, Sweden, G. KempfDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany, H. KrauseUniversität Hamburg, B. LoehrDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany, E. LohrmannUniversität Hamburg, H. MeyerBergische Universität, Wuppertal, P. SteffenDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany, E. WuenschDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany","doi":"arxiv-2407.21482","DOIUrl":"https://doi.org/arxiv-2407.21482","url":null,"abstract":"Gravitational interactions were studied by measuring the influence of small\u0000external field masses on a microwave resonator. It consisted of two spherical\u0000mirrors, which acted as independent pendulumsindividually suspended by strings.\u0000Two identical field masses weremoved along the axis of the resonator\u0000symmetrically and periodically betweena near and a far position. Their\u0000gravitational interaction altered the distance between the mirrors, changing\u0000the resonance frequency, which was measured and found consistent with Newton's\u0000law of gravity. The acceleration of a single mirror caused by the two field masses at the\u0000closest position varied from $5.4 10^{-12} m/s^2$ to $259 10^{-12} m/s^2$.","PeriodicalId":501482,"journal":{"name":"arXiv - PHYS - Classical Physics","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

X-Ray microtomography of mercury intruded compacted clay: An insight into the geometry of macropores 汞侵入密实粘土的 X 射线显微层析：洞察宏观孔隙的几何形状

arXiv - PHYS - Classical Physics Pub Date : 2024-07-30 DOI: arxiv-2407.21083

Shengyang YuanNAVIER UMR 8205, Xianfeng LiuNAVIER UMR 8205, Yongxin WangNAVIER UMR 8205, Pierre DelageNAVIER UMR 8205, Patrick Aimedieu, Olivier Buzzi

{"title":"X-Ray microtomography of mercury intruded compacted clay: An insight into the geometry of macropores","authors":"Shengyang YuanNAVIER UMR 8205, Xianfeng LiuNAVIER UMR 8205, Yongxin WangNAVIER UMR 8205, Pierre DelageNAVIER UMR 8205, Patrick Aimedieu, Olivier Buzzi","doi":"arxiv-2407.21083","DOIUrl":"https://doi.org/arxiv-2407.21083","url":null,"abstract":"Soil properties, such as wetting collapse behavior and permeability, are\u0000strongly correlated to the soil microstructure. To date, several techniques\u0000including mercury intrusion porosimetry (MIP), can be used to characterize the\u0000microstructure of soil, but all techniques have their own limitations. In this\u0000study, the features of mercury that penetrated and has been entrapped in the\u0000pore network of the specimens through MIP testing were investigated by X-Ray\u0000microtomography (X-$mu$CT), in order to give an insight into the geometry of\u0000macropores and possible ink-bottle geometry. Two conditions of water content\u0000and density were selected for the compacted Maryland clay. The distribution and\u0000geometry features of mercury entrapped in the microstructure after MIP were\u0000characterized and pore size distributions were also reconstructed. The results\u0000suggest that, for the two conditions studied in this paper, macropores were\u0000evenly distributed within the specimens, and most of them with a non-spherical\u0000shape, and with aspect ratio (ratio between the maximum and minimum thickness\u0000along a given segment) smaller than three. Different dominant entrance pore\u0000size of macropore was obtained from MIP and X-$mu$CT, due to the specific\u0000experimental protocol used in tests and the effect of ink-bottle geometry. Only\u0000the large pore bodies with high aspect ratio were imaged in X-$mu$CT, due to\u0000the extrusion of mercury during the process of depressurization and subsequent\u0000sample preparation for X- $mu$CT. But entire pore space was accessible in MIP.\u0000The difference in dominant entrance pore size was more significant for\u0000specimens with lower void ratio due to a more pronounced aspect ratio.","PeriodicalId":501482,"journal":{"name":"arXiv - PHYS - Classical Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phase transitions in rolling of irregular cylinders and spheres 不规则圆柱体和球体轧制过程中的相变

arXiv - PHYS - Classical Physics Pub Date : 2024-07-29 DOI: arxiv-2407.19861

Daoyuan Qian, Yeonsu Jung, L. Mahadevan

{"title":"Phase transitions in rolling of irregular cylinders and spheres","authors":"Daoyuan Qian, Yeonsu Jung, L. Mahadevan","doi":"arxiv-2407.19861","DOIUrl":"https://doi.org/arxiv-2407.19861","url":null,"abstract":"When placed on an inclined plane, a perfect 2D disk or 3D sphere simply rolls\u0000down in a straight line under gravity. But how is the rolling affected if these\u0000shapes are irregular or random? Treating the terminal rolling speed as an order\u0000parameter, we show that phase transitions arise as a function of the dimension\u0000of the state space and inertia. We calculate the scaling exponents and the\u0000macroscopic lag time associated with the presence of first and second order\u0000transitions, and describe the regimes of co-existence of stable states and the\u0000accompanying hysteresis. Experiments with rolling cylinders corroborate our\u0000theoretical results on the scaling of the lag time. Experiments with spheres\u0000reveal closed orbits and their period-doubling in the overdamped and inertial\u0000limits respectively, providing visible manifestations of the hairy ball theorem\u0000and the doubly-connected nature of SO(3), the space of 3-dimensional rotations.\u0000Going beyond simple curiosity, our study might be relevant in a number of\u0000natural and artificial systems that involve the rolling of irregular objects,\u0000in systems ranging from nanoscale cellular transport to robotics.","PeriodicalId":501482,"journal":{"name":"arXiv - PHYS - Classical Physics","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141873044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hermitian and non-Hermitian topology in active matter 活性物质中的赫米提拓扑学和非赫米提拓扑学

arXiv - PHYS - Classical Physics Pub Date : 2024-07-23 DOI: arxiv-2407.16143

Kazuki Sone, Kazuki Yokomizo, Kyogo Kawaguchi, Yuto Ashida

{"title":"Hermitian and non-Hermitian topology in active matter","authors":"Kazuki Sone, Kazuki Yokomizo, Kyogo Kawaguchi, Yuto Ashida","doi":"arxiv-2407.16143","DOIUrl":"https://doi.org/arxiv-2407.16143","url":null,"abstract":"Self-propulsion is a quintessential aspect of biological systems, which can\u0000induce nonequilibrium phenomena that have no counterparts in passive systems.\u0000Motivated by biophysical interest together with recent advances in experimental\u0000techniques, active matter has been a rapidly developing field in physics.\u0000Meanwhile, over the past few decades, topology has played a crucial role to\u0000understand certain robust properties appearing in condensed matter systems. For\u0000instance, the nontrivial topology of band structures leads to the notion of\u0000topological insulators, where one can find robust gapless edge modes protected\u0000by the bulk band topology. We here review recent progress in an\u0000interdisciplinary area of research at the intersection of these two fields.\u0000Specifically, we give brief introductions to active matter and band topology in\u0000Hermitian systems, and then explain how the notion of band topology can be\u0000extended to nonequilibrium (and thus non-Hermitian) systems including active\u0000matter. We review recent studies that have demonstrated the intimate\u0000connections between active matter and topological materials, where exotic\u0000topological phenomena that are unfeasible in passive systems have been found. A\u0000possible extension of the band topology to nonlinear systems is also briefly\u0000discussed. Active matter can thus provide an ideal playground to explore\u0000topological phenomena in qualitatively new realms beyond conservative linear\u0000systems.","PeriodicalId":501482,"journal":{"name":"arXiv - PHYS - Classical Physics","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141775421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Computation of Characteristic Mode for Regional Structure of Interconnected Metal Bodies 互联金属体区域结构的特征模式计算

arXiv - PHYS - Classical Physics Pub Date : 2024-07-20 DOI: arxiv-2407.14752

Chenbo Shi, Jin Pan, Xin Gu, Shichen Liang, Le Zuo

引用次数: 0

Representation of continuum equations in physical components for arbitrary curved surfaces 任意曲面的连续方程物理成分表示法

arXiv - PHYS - Classical Physics Pub Date : 2024-07-17 DOI: arxiv-2407.13800

Sujit Kumar Nath

引用次数: 0

An explicit solution to the spinning ring problem 旋转环问题的明确解决方案

arXiv - PHYS - Classical Physics Pub Date : 2024-07-16 DOI: arxiv-2407.13794

Aradhya Jain

引用次数: 0