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Phase-Locking Diffusive Skin Effect

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Chinese Physics Letters 2022年第5期39卷 94-99页

作者： Pei-Chao Cao yu-gui peng Ying Li Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and TechnologyWuhan 430074China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationZJU-Hangzhou Global Scientifc and Technological Innovation CenterZhejiang UniversityHangzhou 310027China International Joint Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of ZhejiangThe Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China Jinhua Institute of Zhejiang University Zhejiang UniversityJinhua 321099China

We explore the exceptional point(EP)induced phase transition and amplitude/phase modulation in thermal diffusion *** start from the asymmetric coupling double-channel model,where the temperature field is unbalanced in the amplitude and locked in the symmetric *** extending into the one-dimensional tight-binding non-Hermitian lattice,we study the convection-driven phase locking and the asymmetric-couplinginduced diffusive skin effect with the high-order EPs in static *** convection and asymmetric couplings,we further show the phase-locking diffusive skin *** work reveals the mechanism of controlling both the amplitude and phase of temperature fields in thermal coupling systems and has potential applications in non-Hermitian topology in thermal diffusion.

关键词： effect coupling asymmetric

Acoustic topological adiabatic passage via a level crossing

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Science China(Physics,Mechanics & Astronomy) 2021年第4期64卷 2-9页

作者： Ya-Xi Shen Long-Sheng Zeng Zhi-Guo Geng De-Gang Zhao yu-gui peng Jie Zhu Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and TechnologyWuhan 430074China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHong KongChina Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China

Stimulated adiabatic passage has been extensively studied to achieve robust and selective population transfer in quantum systems. Recently, the quantum-classic analogy has been rapidly developing and can be considered responsible for the implementation of the adiabatic transfer of sound energy in cavity chain systems. In this article, we investigate the adiabatic transfer of sound energy between two topological end states in the Su-Schrieffer-Heeger(SSH) cavity chain, which can be considered to be the acoustic analog of the quantum chirped-pulse excitation. The topological adiabatic passage in SSH cavity chain has two categories. When the single-cavity resonance frequencies on the sublattices A and B in the SSH cavity chain do not switch their spectrum positions, the topologically protected adiabatic evolution results in the returning passage of the sound excited in one end cavity. When a level crossing with single-cavity resonance frequencies on the sublattices A and B exhibits switch in the frequency spectrum, acoustic energy is observed to be topologically pumped between the two end cavities of the SSH chain.

关键词： acoustic adiabatic passage topological end state level crossing

Tunable Double-Band Perfect Absorbers via Acoustic Metasurfaces with Nesting Helical Tracks

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Chinese Physics Letters 2020年第5期37卷 64-68页

作者： Shu-Huan Xie Xinsheng Fang peng-Qi Li Sibo Huang yu-gui peng Ya-Xi Shen Yong Li Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and TechnologyWuhan 430074 Institute of Acoustics School of Physics Science and EngineeringTongji UniversityShanghai 200092

We propose a design of tunable double-band perfect absorbers based on the resonance absorption in acoustic metasurfaces with nesting helical tracks and deep-subwavelength thicknesses(<λ/30 withλbeing the operation wavelength).By rotating the cover cap with an open aperture on the nesting helical tracks,we can tailor the effective lengths of resonant tubular cavities in the absorber at will,while the absorption peak frequency is flexibly shifted in spectrum and the acoustic impedance is roughly matched with *** simulated particle velocity fields at different configurations reveal that sound absorption mainly occurs at the open *** experiment measurements agree well with the theoretical analysis and simulation,demonstrating the wide-spectrum and tunable absorption performance of the designed flat acoustic device.

关键词： tunable absorber absorption

Probability-Density-Based Deep Learning Paradigm for the Fuzzy Design of Functional Metastructures

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Research 2020年第1期2020卷 1637-1647页

作者： Ying-Tao Luo peng-Qi Li Dong-Ting Li yu-gui peng Zhi-Guo Geng Shu-Huan Xie Yong Li Andrea Alù Jie Zhu Xue-Feng Zhu School of Physics and Innovative Institute Huazhong University of Science and TechnologyWuhan 430074China Institute of Acoustics Tongji UniversityShanghai 200092China Photonics Initiative Advanced Science Research CenterCity University of New York85 St.Nicholas TerraceNew YorkNY 10031USA Department of Mechanical Engineering Hong Kong Polytechnic UniversityHong Kong SARChina Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China

In quantum mechanics,a norm-squared wave function can be interpreted as the probability density that describes the likelihood of a particle to be measured in a given position or *** statistical property is at the core of the fuzzy structure of ***,hybrid neural structures raised intense attention,resulting in various intelligent systems with farreaching ***,we propose a probability-density-based deep learning paradigm for the fuzzy design of functional *** contrast to other inverse design methods,our probability-density-based neural network can efficiently evaluate and accurately capture all plausible metastructures in a high-dimensional parameter *** maxima in probability density distribution correspond to the most likely candidates to meet the desired *** verify this universally adaptive approach in but not limited to acoustics by designing multiple metastructures for each targeted transmission spectrum,with experiments unequivocally demonstrating the effectiveness and generalization of the inverse design.

关键词： inverse Probability acoustics

Super-resolution acoustic image montage via a biaxial metamaterial lens

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Science Bulletin 2020年第12期65卷 1022-1029,M0004页

作者： yu-gui peng Ya-Xi Shen Zhi-Guo Geng peng-Qi Li Jie Zhu Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and TechnologyWuhan 430074China Research Center for Fluid-Structure Interactions Department of Mechanical Engineeringthe Hong Kong Polytechnic UniversityHong KongChina The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China Photonics Initiative Advanced Science Research CenterCity University of New YorkNY 10031USA.

Ever since the Victorian era, montage, the process of pictorial composition made by juxtaposing or superimposing photographs, has been a very popular post-editing imaging technique. Despite showing a strong power in demonstrating complex wave field effects, this technique has neither been fully explored in acoustic imaging nor been realized in real-time systems with the capability beyond diffraction *** the other hand, the recent prospect of metamaterials has shown their great potentials in superresolution acoustic imaging. However, the miracle jigsaw of more advanced functional modulation of acoustic wave fields at deep subwavelength scale still remains elusive. Here we report the experimental implementation of super-resolution acoustic image montage through a judiciously designed biaxial metamaterial lens. Based on the non-diffraction birefringence in the biaxial metamaterials, we realized various montage functionalities such as duplication, composition, and decomposition of sound images with distinctive deep subwavelength features. Our work represents an important step in developing versatile functional acoustic metamaterial devices for imaging purposes, as it provides on-demand editing of sound field patterns beyond diffraction limits.

关键词： Acoustic metamaterials Super-resolution imaging Biaxial metamaterials Montage technique

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基于遗传算法设计超薄超声平面透镜

科学通报 2023年第26期68卷 3464-3471页

作者：林梓彬祝少博彭玉桂祝雪丰华中科技大学物理学院武汉430074 武汉大学中南医院创伤与显微骨科武汉430071

本文从目标超声声场分布出发,基于遗传算法和有限元模拟对超声平面透镜进行结构优化设计.通过迭代二进制编码后的声学人工结构单胞参数,得到所需超声平面透镜的结构模型,数值模拟了透射聚焦声场旁瓣抑制效果.利用波束聚焦过程中产生的... 详细信息

本文从目标超声声场分布出发,基于遗传算法和有限元模拟对超声平面透镜进行结构优化设计.通过迭代二进制编码后的声学人工结构单胞参数,得到所需超声平面透镜的结构模型,数值模拟了透射聚焦声场旁瓣抑制效果.利用波束聚焦过程中产生的多点聚焦和旁瓣分布控制,进一步优化设计出一种超声声瓶束.本文提出的逆向优化设计方法可用于实现基于声学人工结构的水下透射声场精准调控.该方法有望简化定制用途的超声平面透镜设计流程,为基于声学人工结构的超声成像、声辐射力操控器件提供了一种简洁、高效的设计思路和方法.

关键词：声学人工结构超声平面透镜遗传算法波束聚焦

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混合式教学在《高分子化学》课程中的应用与实践

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高分子通报 2019年第12期 52-59页

作者：董黎明陈艳喻桂朋宫贵贞王士凡徐州工程学院化学化工学院徐州221111 中南大学化学化工学院长沙410083

随着互联网技术的发展,基于信息化网络教学平台的混合式教学逐渐成为一种发展趋势。以"超星学习通"为平台,采用BOPPPS教学模型及翻转课堂等多种教学手段,成功开展了《高分子化学》课程的混合教学。2017级高分子材料与工程专业两个平行... 详细信息

随着互联网技术的发展,基于信息化网络教学平台的混合式教学逐渐成为一种发展趋势。以"超星学习通"为平台,采用BOPPPS教学模型及翻转课堂等多种教学手段,成功开展了《高分子化学》课程的混合教学。2017级高分子材料与工程专业两个平行班级为研究对象开展应用效果对比实验,结果发现观察组1班课前线上自学能力逐步增强,期末成绩得分率要明显优于对照组2班,说明采用混合式教学有利于学习效率的提升。通过问卷调查也发现学生对混合式教学的满意度和认可度较高。

关键词：混合式教学 BOPPPS 高分子化学实践

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三嗪基共价微孔有机聚合物的研究进展

高分子通报 2018年第6期 72-84页

作者：徐琛付县喻桂朋潘春跃中南大学化学化工学院长沙410083 大连理工大学精细化工国家重点实验室大连116012

共价微孔有机聚合物近年来成为化学、材料和环境等领域的发展前沿和研究热点。其中,三嗪基共价微孔有机聚合物由于高度共面的、π-共轭的1,3,5-三嗪单元的引入,相对于其它多孔吸附剂具有更高的热化学稳定性、独特的光电性质和对客体分... 详细信息

共价微孔有机聚合物近年来成为化学、材料和环境等领域的发展前沿和研究热点。其中,三嗪基共价微孔有机聚合物由于高度共面的、π-共轭的1,3,5-三嗪单元的引入,相对于其它多孔吸附剂具有更高的热化学稳定性、独特的光电性质和对客体分子的高选择性分离能力。三嗪共价微孔有机聚合物已应用于气体吸附分离、废水吸附净化、药物缓释、光电响应、超电容和非均相催化等多个领域。本文重点阐述三嗪共价微孔有机聚合物的设计及合成,综述了其功能化策略,并展望了其在材料化工和环境能源等领域的应用前景。

关键词： 1 3 5-三嗪共价微孔有机聚合物气体分离电化学

Correlation between the rock mass properties and maximum horizontal stress:A case study of overcoring stress measurements

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 39-48页

作者： peng Li Meifeng Cai Shengjun Miao yuan Li yu Wang Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China

Understanding the mechanical properties of the lithologies is crucial to accurately determine the horizontal stress *** investigate the correlation between the rock mass properties and maximum horizontal stress,the three-dimensional(3D)stress tensors at 89 measuring points determined using an improved overcoring technique in nine mines in China were adopted,a newly defined characteristic parameter C_(ERP)was proposed as an indicator for evaluating the structural properties of rock masses,and a fuzzy relation matrix was established using the information distribution *** results indicate that both the vertical stress and horizontal stress exhibit a good linear growth relationship with *** is no remarkable correlation between the elastic modulus,Poisson's ratio and depth,and the distribution of data points is scattered and ***,there is no obvious relationship between the rock quality designation(RQD)and *** maximum horizontal stress σ_(H) is a function of rock properties,showing a certain linear relationship with the C_(ERP)at the same *** addition,the overall change trend of σ_(H) determined by the established fuzzy identification method is to increase with the increase of C_(ERP).The fuzzy identification method also demonstrates a relatively detailed local relationship betweenσ_H and C_(ERP),and the predicted curve rises in a fluctuating way,which is in accord well with the measured stress data.

关键词： overcoring stress measurements elastic modulus Poisson's ratio rock quality designation maximum horizontal stress fuzzy identification