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Purity-dependent Lorenz num.er, electron hydrodynam.cs and electron-phonon coupling in WTe2

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Science China(Physics,m.chanics & Astronom.) 2024年第8期Mechanics & Astronomy) .卷 157-162页

作者： Wei Xie Feng Yang Liangcai Xu Xiaokang Li Zengwei Zhu Kam.an behnia Wuhan National High m.gnetic Field Center and School of Physics Huazhong University of Science and Technology Laboratoire de Physique et d'étude des m.tériaux (ESPCI-CNRS-Sorbonne Université) PSL University

We present a study of electrical and therm.l transport in Weyl sem.m.tal WTe2down to 0.3 K. The Wiedem.nn-Franz law holds below 2 K and a downward deviation starts above. The deviation is m.re pronounced in cleaner sam.les, as expected in the hydrodynam.c picture of electronic transport, where a fraction of electron-electron collisions conserve m.m.ntum. Phonons are the dom.nant heat carriers and their m.an-free-path does not display a Knudsen m.nim.m. This is presum.bly a consequence of weak anharm.nicity, as indicated by the tem.erature dependence of the specific heat. Frequent m.m.ntum.exchange between phonons and electrons leads to quantum.oscillations of the phononic therm.l conductivity. Bloch-Grüneisen picture of electron-phonon scattering breaks down at low tem.erature when Um.lapp ph-ph collisions cease to be a sink for electronic flow of m.m.ntum.Com.arison with sem.-m.tallic Sb shows that norm.l ph-ph collisions are am.lified by anharm.nicity. In both sem.m.tals, at cryogenic tem.erature, e-ph collisions degrade the phononic flow of energy but not the electronic flow of m.m.ntum.

关键词： therm.l conductivity Wiedem.nn-Franz law electron hydrodynam.cs electron-phonon coupling

IoT-Enabled Autonom.us System.Collaboration for Disaster-Area m.nagem.nt

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IEEE/CAA Journal of Autom.tica Sinica 2020年第5期7卷 1249-1262页

作者： Abenezer Girm. Niloofar Bahadori m.inm.y Sarkar Tadewos G.Tadewos m.ham.ad R.behnia m.Nabil m.hm.ud Ali Karim.ddini Abdollah Hom.ifar IEEE Departm.nt of Electrical and Com.uter Engineering North Carolina A&T State UniversityGreensboroNC 27411 USA

Tim.ly investigating post-disaster situations to locate survivors and secure hazardous sources is critical,but also very challenging and risky.Despite first responders putting their lives at risk in saving others,hum.n-physical lim.ts cause delays in response tim.,resulting in fatality and property dam.ge.In this paper,we proposed and im.lem.nted a fram.work intended for creating collaboration between heterogeneous unm.nned vehicles and first responders to m.ke search and rescue operations safer and faster.The fram.work consists of unm.nned aerial vehicles(UAVs),unm.nned ground vehicles(UGVs),a cloud-based rem.te control station(RCS).A light-weight m.ssage queuing telem.try transport(m.TT)based com.unication is adopted for facilitating collaboration between autonom.us system..To effectively work under unfavorable disaster conditions,antenna tracker is developed as a tool to extend network coverage to distant areas,and m.bile charging points for the UAVs are also im.lem.nted.The proposed fram.work’s perform.nce is evaluated in term. of end-to-end delay and analyzed using architectural analysis and design language(AADL).Experim.ntal m.asurem.nts and sim.lation results show that the adopted com.unication protocol perform. m.re efficiently than other conventional com.unication protocols,and the im.lem.nted UAV control m.chanism. are functioning properly.Several scenarios are im.lem.nted to validate the overall effectiveness of the proposed fram.work and dem.nstrate possible use cases.

关键词： Architectural analysis and design language(AADL)and cloud com.uting disaster area m.nagem.nt internet of things(IoT) m.ssage queuing telem.try transport(m.TT) unm.nned aerial vehicle(UAV) unm.nned ground vehicle(UGV)

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应用红外热像技术测量电子元件正常工作条件下的表面温度

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红外技术 2002年第3期24卷 44-48页

作者：杨晶 m.behnia G.m.rrison 北京科技大学机械工程学院北京100083 新南威尔士大学机械与制造工程学院

由于电子元件的功率密度不断增加 ,电子产品的热控制日显重要。红外热像仪有众多优点且可用于电子元件表面温度的测量。探讨了如何在电子元件正常工作条件下 ,应用红外热像仪获得其真实表面温度 ,涉及背景温度、目标温度的正确估计 ,透... 详细信息

由于电子元件的功率密度不断增加 ,电子产品的热控制日显重要。红外热像仪有众多优点且可用于电子元件表面温度的测量。探讨了如何在电子元件正常工作条件下 ,应用红外热像仪获得其真实表面温度 ,涉及背景温度、目标温度的正确估计 ,透明材料的选取、透射率的估算 ,误差及可能的修正方法。

关键词：红外热像温度测量电子元件冷却表面温度

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Attenuation and penetration of pulsed supersonic liquid jets-an experim.ntal study

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Attenuation and penetration of pulsed supersonic liquid jets...