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Mechanical Characteristics Analysis of 3D-printing Novel Chiral Honeycomb Array Structures Based on Functional Principle and Constitutive Relationship

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Journal of Bionic Engineering 2023年第5期20卷 1917-1929页

作者： Ruiyao Liu Guofeng Yao Zezhou Xu Xue Guo Jianyong Li Zhenglei Yu Ping Liang Zhihui Zhang Chunyang Han Department of Mechanics School of Mechanical and Aerospace EngineeringJilin UniversityChangchun130022China Key Laboratory of Bionic Engineering of Ministry of Education Jilin UniversityChangchun130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun130022China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun130022China

Four novel chiral honeycomb structures inspired by the biological arrangement shape are *** functional principle is raised to solve the large deformation of bio-inspired structures and the structural constitutive model is proposed to explain the quasi-static mechanical properties of chiral honeycomb array structures and honeycomb *** and experiment results verify the accuracy of theoretical analysis results and the errors are all within 15%.In structural mechanical properties,Equidimensional Chiral Honeycomb Array Structure(ECHS)has excellent mechanical *** ECHS,Small-sized Column Chiral Honeycomb Array Structure(SCHCS)has the best *** bearing capacity,specific energy absorption,and specific strength of SCHCS are more than twice as much as the others in this *** chiral honeycomb array structure has the best mechanical properties at a certain *** the structural design,the optimal size model should be obtained first in combination with the optimization algorithm for the protection design.

关键词： Bionic Gradient sizes Function principle Constitutive model The global simulated annealing optimization algorithm

Effective transport network driven by tortuosity gradient enables high-electrochem-active solid-state batteries

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National science Review 2023年第3期10卷 178-188页

作者： Qing-Song Liu Han-Wen An Xu-Feng Wang Fan-Peng Kong Ye-Cai Sun Yu-Xin Gong Shuai-Feng Lou Yi-Fan Shi Nan Sun Biao Deng Jian Wang Jia-Jun Wang Ministry of Industry and Information Technology(MIIT) Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of Technology(HIT) chongqing Research Institute of HIT Shanghai Institute of Applied Physics Chinese Academy of Sciences Canadian Light Source Inc. University of Saskatchewan

Simultaneously achieving high electro chemical activity and high loading for solid-state batteries has been hindered by slow ion transport within solid electrodes,in particular with an increase in electrode *** transport governed by ’point-to-point’ diffusion inside a solid-state electrode is challenging,but still remains ***,synchronized electrochemical analysis using X-ray tomography and ptychography reve als new insights into the nature of slow ion transport in solid-state electrodes.’hickness-dependent delithiation kinetics are spatially probed to identify that low-delithiation kinetics originate from the high tortuous and slow longitudinal transport *** fabricating a tortuosity-gradient electrode to create an effective ion-percolation network,the tortuosity-gradient electrode architecture promotes fast charge transport,migrates the heterogeneous solid-state reaction,enhances electrochemical activity and extends cycle life in thick solid-state ele *** findings establish effective transport pathways as key design principles for realizing the promise of solid-state high-loading cathodes.

关键词： all-solid-state batteries thick electrodes lithiation/delithiation heterogeneity tortuosity gradient synchrotron techniques

Design of a Fused-Silica Subwavelength Polarizing Beam Splitter Grating Based on the Modal Method

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Chinese Physics Letters 2010年第2期27卷 127-130页

作者：赵华君袁代蓉王沛鲁拥华明海 Department of Electronic and Electrical Engineering Chongqing University of Arts and Sciences Chongqing 402160 Anhui Key Lab of Optoelectronic science and Technology Department of Optics and Optical Engineering University of Science and Technology of China Hefei 230026

A polarizing beam splitter （PBS） design based on a fused-silica lamellar subwavelength transmission grating is demonstrated with the modal method, where TE- and TM-polarized waves are mainly diffracted in the -1st and 0th orders, respectively. The physical explanation of the grating diffraction is illustrated by the interference of the corresponding parts of the two propagating modes, which is very similar to a Mach-Zehnder interferometer. It is shown that diffraction efficients over 99% for a TM-polarized wave in the -1st order and 90% for a TE-polarized wave in the 0th order are obtained at the wavelength of 1.053 μm. The polarization transmission extinction ratios are better than 33 dB and 51 dB for the order 0th and the -1st order, respectively. The splitting properties of the PBS grating designed by the modal method are in good agreement with the results simulated by the rigorous coupled wave analysis method.

关键词： Optics quantum optics and lasers

Research progress of voltage delay in magnesium battery

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Chinese science Bulletin 2014年第17期59卷 1936-1941页

作者： Lin Chen Changguo Chen Chaozhong Guo College of Chemistry and Chemical Engineering Chongqing University College of Material and Chemical Engineering Sichuan University of Science and Engineering

Research on magnesium battery has three primary fields as follows:changing the metallurgical factors of the magnesium electrode material to improve discharge performance,identifying inhibitors to form a protective film to reduce self-corrosion of magnesium alloys,and improving the electrochemical properties of the electrolyte to improve discharge *** the research and development of the magnesium battery,the voltage delay that occurs in the discharge process is a critical issue because it limits the application of Mg/*** paper provides an overview of the relationship between the voltage delay of magnesium primary battery and magnesium anode ***,the factors affecting the voltage delay were analyzed,and the existing problems in the study of the voltage delay of magnesium battery were identified.

关键词：电池电压镁电池延迟电化学性能放电性能冶金因素电极材料放电过程

维普期刊数据库

Deep Learning for Secure Transmission in Reconfigurable Intelligent Surface-Assisted Communications

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Journal of Communications and Information Networks 2023年第2期8卷 122-132页

作者： Junhao Fang Xiangyu Zou Chongwen Huang Zhaohui Yang Yongjun Xu Xiao Chen Jianfeng Shi Mohammad Shikh-Bahaei Centre for Telecommunications Research Department of EngineeringKing’s College LondonWC2R 2LSUK National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China College of Information science and Electronic Engineering Zhejiang UniversityHangzhou 310027China chongqing University of Posts and Telecommunications Chongqing 400065China Nanjing University of Information science and Technology Nanjing 210044China

This paper investigates the secure transmission for reconfigurable intelligent surface(RIS)-assisted wireless communication *** the studied model,one user connects to the access point via a RIS while an eavesdropper eavesdrops on the signal sent from the user to the access ***,it is necessary to design an appropriate RIS reflection vector to solve the eavesdropping *** problem is formulated as an optimization problem whose goal is to maximize the secure energy efficiency which is defined as the ratio of the secure rate to the total energy consumption of the system via jointly optimizing the RIS reflection reflector as well as the number of RIS elements,which results in a non-convex optimization problem that is intractable to solve by traditional *** tackle this issue,a new algorithm by leveraging the advance of the established deep learning(DL)technique is proposed so as to find the optimal RIS reflection vector and determine the optimal number of RIS reflection *** results show that the proposed method reaches 96%of the optimal secure energy efficiency of the genie-aided algorithm.

关键词： RISs physical layer security DL secure energy efficiency

Tetracycline removal by a magnetic heterojunction Cu_(2)O/CoFe_(2)O_(4) activating peroxymonosulfate

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Rare Metals 2023年第3期42卷 862-874页

作者： Xiao-Qing Li Shan Feng Jun Yang Tai-Ping Xie Jian-Kang Wang Xiao-Jing Chen De-Shun Kong Hou-Yang Chen Department of Chemical Engineering Chongqing Chemical Industry Vocational CollegeChongqing 401228China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China chongqing Key Laboratory of Environmental Materials and Remediation Technologies College of Chemical and Environmental EngineeringChongqing University of Arts and SciencesYongchuan 402160China School of Materials science and Engineering Yangtze Normal UniversityChongqing 408100China School of Mining and Civil Engineering Liupanshui Normal UniversityLiupanshui 553004China chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China

The electron transfer mechanism in the process of peroxymonosulfate(PMS)activation using heterojunction catalyst was *** this work,magnetic heterojunction Cu_(2)O/CoFe_(2)O_(4)(CC)was first synthesized to activate *** innovative reaction mechanism based on built-in electric field-driven electron migration from Cu2O to CoFe2O4 and effective magnetic moment of CC for enhancing PMS activation was ***,the CC/PMS system was used for efficient removal of antibiotic tetracycline(TC).Under optimal conditions,98.0%TC could be removed using CC/PMS catalytic system after only 30 *** catalytic activity was higher than that of Cu_(2)O/PMS and CoFe_(2)O_(4)/***,the impact of solution pH on TC removal was insignificant,suggesting the pH-insensitive PMS activation ability of ***,the coexisting inorganic ions in the environment,such as HCO_(3)-,H_(2)PO4-,NO_(3)-,Cl-and humic acid(HA)as representative of natural organic matter,did not inhibit TC removal in CC/PMS ***,CC/PMS system exhibited excellent reusability with more than94.0%TC removal after the 5th *** paramagnetic resonance(EPR)tests and quenching experiments showed that O_(2)·-and 1O_(2) played vital roles in TC *** intermediate products and corresponding toxicity assessment revealed that this catalytic system could reduce TC *** work provided new insights into the PMS activation mechanism using heterogeneous magnetic catalysts,including transition metal oxide.

关键词： Peroxymonosulfate(PMS)activation Heterojunction catalyst Electron migration Cu2O CoFe204

维普期刊数据库

Effects of variable-time impulses on global exponential stability of Cohen-Grossberg neural networks

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International Journal of Biomathematics 2017年第8期10卷 241-263页

作者： Xianxiu Zhang Chuandong Li Tingwen Huang Hafiz Gulfam Ahmad College of Electronic and Information EngineeringSouthwest University Chongqing 400715 P. R. China Department of Mathematics Liupanshui Normal University Guizhou Liupanshui 553001 P. R. China Department of MathematicsTexas A&M University at Qatar Doha 23874 Qatar Department of Computer science and ITGhazi University D. G. Khan 32260 Pakistan

We investigate the global exponential stability of Cohen-Grossberg neural networks （CGNNs） with variable moments of impulses using B-equivalence method. Under cer- tain conditions, we show that each solution of the considered system intersects each surface of discontinuity exactly once, and that the variable-time impulsive systems can be reduced to the fixed-time impulsive ones. The obtained results imply that impul- sive CGNN will remain stability property of continuous subsystem even if the impulses are of somewhat destabilizing, and that stabilizing impulses can stabilize the unsta- ble continuous subsystem at its equilibrium points. Moreover, two stability criteria for the considered CGNN by use of proposed comparison system are obtained. Finally, the theoretical results are illustrated by two examples.

关键词： Cohen-Grossberg neural network (CGNN) variable-time impulse B-equiv-alence global exponential stability.

Gender-Specific Multi-Task Micro-Expression Recognition Using Pyramid CGBP-TOP Feature

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Computer Modeling in Engineering & sciences 2019年第3期118卷 547-559页

作者： Chunlong Hu Jianjun Chen Xin Zuo Haitao Zou Xing Deng Yucheng Shu School of Computer science and Engineering Jiangsu University of Science and TechnologyZhenjiang212003Chinal School of Computer science and Technology Chongqing University of Posts and TelecommunicationsChongqing400065China

Micro-expression recognition has attracted growing research interests in the field of compute ***,micro-expression usually lasts a few seconds,thus it is difficult to *** paper presents a new framework to recognize micro-expression using pyramid histogram of Centralized Gabor Binary Pattern from Three Orthogonal Panels(CGBP-TOP)which is an extension of Local Gabor Binary Pattern from Three Orthogonal Panels ***-TOP performs spatial and temporal analysis to capture the local facial characteristics of micro-expression image *** order to keep more local information of the face,CGBP-TOP is extracted based on pyramid subregions of the micro-expression video *** combination of CGBP-TOP and spatial pyramid can represent well and truly the facial movements of the micro-expression image ***,the dimension of our pyramid CGBP-TOP tends to be very high,which may lead to high data redundancy *** addition,it is clear that people of different genders usually have different ways of ***,in this paper,in order to select the relevant features of micro-expression,the gender-specific sparse multi-task learning method with adaptive regularization term is adopted to learn a compact subset of pyramid CGBP-TOP feature for micro-expression classification of different ***,extensive experiments on widely used CASME II and SMIC databases demonstrate that our method can efficiently extract micro-expression motion features in the micro-expression video ***,our proposed approach achieves comparable results with the state-of-the-art methods.

关键词： Micro-expression recognition feature extraction spatial pyramid multi-task learning regularization

Development of Fe-Mn-Si-Cr-Ni shape memory alloy with ultrahigh mechanical properties and large recovery strain by laser powder bed fusion

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Journal of Materials science & Technology 2023年第19期150卷 201-216页

作者： Xiao Yang Lijin Cheng Huabei Peng Bingnan Qian Lei Yang Yunsong Shi Annan Chen Zhengyan Zhang Libin Zhao Ning Hu Chunze Yan Yusheng Shi State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China School of Mechanical Engineering Sichuan UniversityChengdu 610065China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Transportation and Logistics Engineering Wuhan University of TechnologyWuhan 430070China Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China

This work systematically studied the effect of volumetric energy density E on the densification,mi-crostructures,tensile mechanical properties,and shape memory performance of a Fe-Mn-Si-Cr-Ni shape memory alloy(SMA)fabricated by laser powder bed fusion(L-PBF).An E of 90-265 J/mm3 is suggested to fabricate the Fe-Mn-Si-Cr-Ni SMA with minor metallurgical defects and a high relative density of above 99%.The increase in E can promote the formation of the primaryγaustenite and the solid phase trans-formation from the primaryδferrite to theγaustenite,which helps to achieve a nearly complete y austenitic *** increase in E also contributes to fabricating the Fe-Mn-Si-Cr-Ni SMA with superior comprehensive mechanical properties and shape memory performance by *** Fe-Mn-Si-Cr-Ni SMA with a combination of good ductility of around 30%,high yield strength of above 480 MPa,an ultrahigh ultimate tensile strength of above 1 GPa,and large recovery strain of about 6%was manu-factured by L-PBF under a high E of 222-250 J/mm^(3).The good shape memory effect,excellent compre-hensive mechanical properties,and low cost of Fe-Mn-Si-Cr-Ni SMAs,as well as the outstanding ability to fabricate complex structures of L-PBF technology,provide a solid foundation for the design and fabri-cation of novel intelligent structures.

关键词： Shape memory alloys Fe-Mn-Si-based alloys Laser powder bed fusion Mechanical property Microstructure