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Formation of topological domain walls and quantum transport properties of zero-line modes in commensurate bilayer graphene systems

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Frontiers of physics 2022年第6期17卷 95-105页

作者： Junjie Zeng Rui Xue Tao Hou Yulei Han Zhenhua Qiao ICQD Hefei National Laboratory for Physical Sciences at MicroscaleCAS Key Laboratory of Strongly-Coupled Quantum Matter PhysicsDepartment of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Department of Physics Fuzhou UniversityFuzhou 350108China

We study theoretically the construction of topological conducting domain walls with a finite width between AB/BA stacking regions via finite element method in bilayer graphene systems with tunable commensurate twisting angles.We find that the smaller is the twisting angle,the more significant the lattice reconstruction would be,so that sharper domain boundaries declare their existence.We subsequently study the quantum transport properties of topological zero-line modes which can exist because of the said domain boundaries via Green’s function method and Landauer–Büttiker formalism,and find that in scattering regions with triintersectional conducting channels,topological zero-line modes both exhibit robust behavior exemplified as the saturated total transmission Gtot≈2e_(2)/h and obey a specific pseudospin-conserving current partition law among the branch transport channels.The former property is unaffected by Aharonov–Bohm effect due to a weak perpendicular magnetic field,but the latter is not.Results from our genuine bilayer hexagonal system suggest a twisting angle aroundθ≈0.1°for those properties to be expected,consistent with the existing experimental reports.

关键词： twistronics lattice reconstruction topological domain wall zero-line mode quantum transport

Target-oriented Passive Localization Techniques Inspired by Terrestrial Arthropods: A Review

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Journal of Bionic Engineering 2022年第3期19卷 571-589页

作者： Fu Liu Yueqiao Wang Yufeng Zhao Meihe Liu Tao Hou Zhiwu Han College of Communication Engineering Jilin UniversityChangchun130022China Key Laboratory of Bionic Engineering Jilin UniversityChangchun130022China

For centuries,researchers have been fascinated by how simple-minded arthropods pick up definite cues and locate a potential target in an instant.Contrary to the active echolocation of classical creatures,arthropods exhibit passive characteristics.They use spatially separated sensilla to cooperatively pinpoint target-generated signal sources such as sound,light,ground vibration,air disturbance,and thermal radiation.The paper introduces the localization mechanisms of typical terrestrial arthropods with diverse survival habits.Focusing on these special mechanisms,a series of theoretical models and advanced bionic equipment have been reviewed,and some key challenges and future directions are proposed.We believe that intensive study on arthropods can promote innovative development of miniaturized,low power-dissipation,and high-performance localization equipment,thereby enhancing and expanding current localization techniques.

关键词： Target-oriented localization Passive techniques Terrestrial arthropods Bioinspiration

Recover the Secret Components in a ForkCipher

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Chinese Journal of Electronics 2023年第3期32卷 597-602页

作者： hou tao ZHANG Jiyan CUI Ting PLA SSF Information Engineering University

Recently, a new cryptographic primitive has been proposed called ForkCiphers. This paper aims at proposing new generic cryptanalysis against such constructions. We give a generic method to apply existing decompositions againt the underlying block cipher εron the forking variant Forkε-(r-1)-r0-(r+1-r0). As application, we consider the security of ForkSPN and ForkFN with secret inner functions. We provide a generic attack against ForkSPN-2-r0-(4-r0) based on the decomposition of SASAS. And also we extend the decomposition of Biryukov et al. against Feistel networks in SAC 2015 to get all the unknown round functions in ForkFN-r-r0-r1for r ≤ 6 and r0+r1≤ 8. Therefore, compared with the original block cipher, the forking version requires more iteration rounds to resist the recovery attack.

关键词： Recovery attack ForkCipher Substitution-permutation network (SPN) Feistel network Secret design criteria

A consecutive joint shear strength model considering the 3D roughness of real contact joint surface

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International Journal of Mining Science and Technology 2023年第5期33卷 617-624页

作者： Liren Ban Zhigang tao Weisheng Du Yuhang hou School of Civil and Transportation Engineering Beijing University of Civil Engineering and ArchitectureBeijing 100044China State Key Laboratory of Deep Geotechnical Mechanics and Deep Underground Engineering Beijing 100083China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing 100083China Deep Mining and Rock Burst Research Branch China Coal Research InstituteBeijing 100013China State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China

A consecutive joint shear strength model for soft rock joints is proposed in this paper,which takes into account the degradation law of the actual contact three-dimensional(3D)roughness.The essence of the degradation of the maximum possible dilation angle is the degradation of the 3D average equivalent dip angle of the actual contact joint asperities.Firstly,models for calculating the maximum possible dilation angle at the initial and residual shear stress stages are proposed by analyzing the 3D joint morphology characteristics of the corresponding shear stages.Secondly,the variation law of the maximum possible dilation angle is quantified by studying the degradation law of the joint micro convex body.Based on the variation law of the maximum possible dilation angle,the maximum possible shear strength model is proposed.Furthermore,a method to calculate the shear stiffness degradation in the plastic stage is proposed.According to the maximum possible shear strength of rock joints,the shear stress-shear displacement prediction model of rock joints is obtained.The new model reveals that there is a close relationship between joint shear strength and actual contact joint roughness,and the degradation of shear strength after the peak is due to the degradation of actual contact joint roughness.

关键词： Shear strength Actual contact area 3D roughness Shear test

Preface to the special issue on“Recent Advances in Functional Fibers”

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Frontiers of Optoelectronics 2022年第4期15卷 157-160页

作者： Lei Wei Guangming tao Chong hou Wei Yan School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore Wuhan National Laboratory for Optoelectronics and Sport and Health Initiative Optical Valley LaboratoryHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

Fiber is one of the most fundamental material forms seen in human life.Beftting from their long and bendable shape,fbers with diferent specialties and diferent dimensions are used in a multitude of applications,ranging from fabrics[1]to telecommunications[2],from generating laser[3]to sensing and actuating,etc.[4-6].In recent years,major breakthroughs were made,demonstrating that fbers have novel optical[7-9],electronic[10],acoustic[11,12]and cell interfacing[13,14]properties that enable new functionalities.Functional fbers and related application research are at the crossroads of many disciplines,including optics,materials science,device physics,nanotechnology,and fuid dynamics.

关键词： Functional breakthrough optics

Research on the MPPT of Photovoltaic Power Generation Based on the CSA-INC Algorithm

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Energy Engineering 2023年第1期120卷 87-106页

作者： Tao Hou Shan Wang School of Automation and Electrical Engineering Lanzhou Jiaotong UniversityLanzhou730070China Rail Transit Electrical Automation Engineering Laboratory of Gansu Province(Lanzhou Jiaotong University) Lanzhou730070China

The existing Maximum Power Point Tracking(MPPT)method has low tracking efficiency and poor stability.It is easy to fall into the Local Maximum Power Point(LMPP)in Partial Shading Condition(PSC),resulting in the degradation of output power quality and efficiency.It was found that various bio-inspired MPPT based optimization algorithms employ different mechanisms,and their performance in tracking the Global Maximum Power Point(GMPP)varies.Thus,a Cuckoo search algorithm(CSA)combined with the Incremental conductance Algorithm(INC)is proposed(CSA-INC)is put forward for the MPPT method of photovoltaic power generation.The method can improve the tracking speed by more than 52%compared with the traditional Cuckoo Search Algorithm(CSA),and the results of the study using this algorithm are compared with the popular Particle Swarm Optimization(PSO)and the Gravitational Search Algorithm(GSA).CSA-INC has an average tracking efficiency of 99.99%and an average tracking time of 0.19 s when tracking the GMPP,which improves PV power generation’s efficiency and power quality.

关键词： Partial shading condition sudden light intensity cuckoo search algorithm maximum power point tracking Incremental conductance Algorithm

Anisotropic Fermat’s principle for controlling hyperbolic van der Waals polaritons

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Photonics Research 2022年第10期10卷 I0023-I0031页

作者： SICEN tao Tao Hou YALI ZENG GUANGWEI HU ZIXUN GE JUNKE LIAO SHAN ZHU TAN ZHANG CHENG-WEI QIU HUANYANG CHEN Department of Physics Institute of Electromagnetics and AcousticsCollege of Physical Science and TechnologyXiamen UniversityXiamen 361005China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore

Transformation optics(TO)facilitates flexible designs of spatial modulation of optical materials via coordinate transformations,thus,enabling on-demand manipulations of electromagnetic waves.However,the application of TO theory in control of hyperbolic waves remains elusive due to the spatial metric signature transition from(+,+)to(−,+)of a two-dimensional hyperbolic geometry.Here,we proposed a distinct Pythagorean theorem,which leads to establishing an anisotropic Fermat’s principle.It helps to construct anisotropic geometries and is a powerful tool for manipulating hyperbolic waves at the nanoscale and polaritons.Making use of absolute instruments,the excellent collimating and focusing behaviors of naturally in-plane hyperbolic polaritons in van der Waals𝛼α–MoO_(3)layers are demonstrated,which opens up a new way for polaritons manipulation.

关键词： hyperbolic polar Fermat

Recent advances in the synthesis and application of N-heterocyclic carbene-based molecular cages

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Science China Chemistry 2024年第5期67卷 1510-1523页

作者： Qiongjie Chai Lixin Duan Yanzhe Ma Tianheng hou tao Tu Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Department of ChemistryFudan UniversityShanghai 200438China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

N-Heterocyclic carbene(NHC)-based cages have emerged as a prominent and dynamic research area within the research field of chemistry. Leveraging the distinctive electronic and steric properties of NHC ligands, the design, synthesis, and application of these corresponding cages have garnered substantial scholarly interest. In recent years, we have witnessed the successful fabrication of diverse NHC-based cages through a range of synthetic methodologies, which hold significant potential for applications in molecular recognition and catalysis. In this review, we delve into the foundational synthetic strategies that underlie the creation of NHC-based cages, employing approaches encompassing metal–NHC chelation, coordination assembly,and covalent bonding. Additionally, we compile the diverse applications of these cages within catalytic processes and molecular recognition. Lastly, we shed light on the current limitations of synthesis and outline future trends in the development of NHCbased cages.

关键词： N-heterocyclic carbene molecular cages supramolecular chemistry synthetic strategies applications

Collaborative representation with background purification and saliency weight for hyperspectral anomaly detection

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Science China(Information Sciences) 2022年第1期65卷 247-258页

作者： Zengfu hou Wei LI Ran tao Pengge MA Weihua SHI School of Information and Electronics Beijing Institute of Technology School of Intelligent Engineering Zhengzhou University of Aeronautics Urban-Rural Planning Administration Center Ministry of Housing and Urban-Rural Development of the People's Republic of China

Collaborative representation-based detection(CRD) has been developed in hyperspectral anomaly detection tasks and testified to be very effective; however, heterogeneous pixels in the background may affect the accuracy of linear representation and make its performance suboptimal. To address this issue, a background purification framework based on linear representation is proposed, in which an automatic outlier removal strategy based on initial coefficients is designed to purify the background. In the proposed method, the classic least squares technique is firstly adopted to obtain preliminary linear representation coefficients, which are positively correlated with its contribution to a central testing pixel. Then, using statistical analysis of the representation coefficients, purified background pixels are obtained. Furthermore, a saliency weight is applied to fully utilize the spatial information of inner window pixels. Extensive experiments with three real hyperspectral datasets show that the proposed method outperforms state-of-the-art CRD and other traditional detectors.

关键词： hyperspectral anomaly detection background purification collaborative representation saliency weight