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Particle-in-cell investigation on the resonant absorption of a plasma surface wave

Chinese Physics B 2011年第10期20卷 319-324页

作者：蓝朝晖胡希伟 Institute of Fluid Physics China Academy of Engineering Physics College of Electrical and Electronic Engineering Huazhong University of Science and Technology

The resonant absorption of a plasma surface wave is supposed to be an important and efficient mechanism of power deposition for a surface wave plasma source. In this paper, by using the particle-in-cell method and Monte Carlo simulation, the resonance absorption mechanism is investigated. Simulation results demonstrate the existence of surface wave resonance and show the high efficiency of heating electrons. The positions of resonant points, the resonance width and the spatio-temporal evolution of the resonant electric field are presented, which accord well with the theoretical results. The paper also discusses the effect of pressure on the resonance electric field and the plasma density.

关键词： particle-in-cell simulation plasma surface wave resonant absorption

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Acoustic anechoic layers with singly periodic array of scatterers: Computational methods, absorption mechanisms, and optimal design

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Chinese Physics B 2014年第10期23卷 283-291页

作者：杨海滨李岳赵宏刚温激鸿温熙森 Vibration and Acoustics Research Group Laboratory of Science and Technology on Integrated Logistics SupportCollege of Mechatronics and Automation National University of Defense Technology

The acoustic properties of anechoic layers with a singly periodic array of cylindrical scatterers are investigated. A method combined plane wave expansion and finite element analysis is extended for out-of-plane incidence. The reflection characteristics of the anechoic layers with cavities and locally resonant scatterers are discussed. The backing is a steel plate followed by an air half space. Under this approximate zero transmission backing condition, the reflection reduction is induced by the absorption enhancement. The absorption mechanism is explained by the scattering/absorption cross section of the isolated scatterer. Three types of resonant modes which can induce efficient absorption are revealed. Due to the fact that the frequencies of the resonant modes are related to the size of the scatterers, anechoic layers with scatterers of mixed size can broaden the absorption band. A genetic optimization algorithm is adopted to design the anechoic layer with scatterers of mixed size at a desired frequency band from 2 kHz to l0 kHz for normal incidence, and the influence of the incident angle is also discussed.

关键词： acoustic anechoic layer resonant scattering resonant absorption singly periodic mixed size

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Optical visualization and polarized light absorption of the single-wall carbon nanotube to verify intrinsic thermal applications

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Light(Science & Applications) 2015年第1期4卷 251-258页

作者： Xiao Zhang Li Song Le Cai Xuezeng Tian Qiang Zhang Xiaoying Qi Wenbin Zhou Nan Zhang Feng Yang Qingxia Fan Yanchun Wang Huaping Liu Xuedong Bai Weiya Zhou Sishen Xie Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China National Center for Nanoscience and Technology Beijing 100190China

The predicted extraordinary properties of carbon nanotubes(CNTs)from theoretical calculations have great potential for many ***,reliable experimental determination of intrinsic properties at the single-tube level is currently a matter of concern,and many challenges remain because of the unhandled and nanoscale size of individual ***,we demonstrated a prototype to detect the intrinsic thermal conductivity of the single-wall carbon nanotube(SWCNT)and verify the significant non-resonant optical absorption behavior on tiny nanotubes by integrating the nanotube and ice into a new core-shell *** particular,a reversible optical visualization method based on the individual suspended ultra-long SWCNT was first developed by wrapping a nanotube with ice in the cryogenic air *** light-induced thermal effect on the hybrid core-shell structure was used tomelt the ice shell,which subsequently acted as a temperature sensor to verify the intrinsic thermal conductivity of the core-like *** interestingly,we successfully determined for the first time the thermal response phenomenon of the tiny absorption cross section in SWCNT in the vertical-polarization configuration and the significant non-resonant absorption behavior in the parallel-polarization *** investigations will provide a better understanding for the unique optical behaviors of CNT and enable the detection of intrinsic properties of various one-dimensional nanostructures such as nanotubes,nanowires,and nanoribbons.

关键词： carbon nanotube optical visualization polarized laser resonant absorption

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Numerical Research of Mode Conversion in an Inhomogeneous Plasma

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Plasma Science and Technology 2005年第5期7卷 3037-3040页

作者：谭立伟王舸陈银华 Department of Modern Physics University of Science and Technology of China

The linear mode conversion of electromagnetic waves in the hot, unmagnetized inhomogeneous plasma is studied numerically for different density profiles, and the dependence of the absorption coefficient on the incident angles and the wave frequencies are obtained for different electrons＇ temperature. The results show that the shapes of the density profiles and the electron＇s temperature create a certain effect on the coefficients of absorption, which reaches its peak value （about 50%） for appropriate parameters. Effective absorption occurs in a limited range of parameter q.

关键词： mode conversion absorption coefficient finite difference method resonant absorption

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Theoretical Review of Mossbauer Effect,Hyperfine Interactions Parameters and the Valence Fluctuations in Eu Systems

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Journal of Applied Mathematics and Physics 2019年第1期7卷 254-270页

作者： Mahmoud Abdelrazek Ahmida Electrical Engineering Department The Higher Institute of Sciences and Technology Ajdabiya Libya

In this paper, an overview of the theory of Mössbauer effect is covered, and the main hyperfine interactions parameters which affect the shape of the resultant Mössbauer spectrum are explained and illustrated as well. In principle, Mössbauer effect applies to any and all nuclides, but in practice, certain ideal properties are desirable;that is, the conditions for recoil-free emission and absorption of gamma rays must be optimized. Therefore, briefly discussed in this review, one of the most commonly used for practical and fundamental studies the 151Eu Mössbauer isotope. Also, the intermediate valence phenomena and their theoretical treatments are briefly discussed.

关键词： M?ssbauer Spectroscopy resonant absorption Recoil-Free Fraction 151Eu Mossbauer Isotope Hyperfine Interactions Valence Fluctuations

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