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Adaptive and optimal detection of elastic object scattering with single-channel monostatic iterative time reversal

Chinese Physics B 2011年第5期20卷 300-304页

作者：应英子马力郭圣明 Institute of Acoustics Chinese Academy of Sciences

In active sonar operation, the presence of background reverberation and the low signal-to-noise ratio hinder the detection of targets. This paper investigates the application of single-channel monostatic iterative time reversal to mitigate the difficulties by exploiting the resonances of the target. Theoretical analysis indicates that the iterative process will adaptively lead echoes to converge to a narrowband signal corresponding to a scattering object＇s dominant resonance mode, thus optimising the return level. The experiments in detection of targets in free field and near a planar interface have been performed. The results illustrate the feasibility of the method.

关键词： iterative time reversal resonant scattering echo enhancement

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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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Heteronuclear Efimov resonances in ultracold quantum gases

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National Science Review 2016年第2期3卷 174-188页

作者： Juris Ulmanis Stephan Hfner Eva D.Kuhnle Matthias Weidemller Physikalisches Institut Universitt Heidelberg Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics and CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum PhysicsUniversity of Science and Technology of China

The Efimov scenario is a universal three-body effect addressing many areas of modern quantum *** plays an important role in the transition between few- and many-body physics and has enabled important breakthroughs in the understanding of the universal few-body *** review the basic concepts of the Efimov scenario with specific emphasis on the similarities and differences between homonuclear and heteronuclear *** the latter scenario,the existence of a second,independently tunable interaction parameter enables novel few-body phenomena that are universal and have no counterexamples in the homonuclear *** discuss recent experimental approaches using ultracold atomic gases with magnetically tunable interactions and elucidate the role of short-range interactions in the emergence of universal and non-universal behavior.

关键词： Efimov resonances few-body physics Feshbach resonances ultracold atoms resonant scattering

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