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Self-shaping of bioinspired chiral composites

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Acta Mechanica Sinica 2014年第4期30卷 533-539页

作者： qing-qing Rong Yu-Hong Cui Takahiro Shimada jian-Shan Wang Takayuki Kitamura Tianjin Key Laboratory of Modern Engineering Mechanics Department of MechanicsTianjin University Department of Mechanical Engineering and Science Kyoto University

Self-shaping materials such as shape memory polymers have recently drawn considerable attention owing to their high shape-changing ability in response to changes in ambient conditions, and thereby have promising applications in the biomedical, biosensing, soft robotics and aerospace fields. Their design is a crucial issue of both theoretical and technological interest. Motivated by the shape-changing ability of Towel Gourd tendril helices during swelling/deswelling, we present a strategy for realizing self-shaping function through the deformation of micro/nanohelices. To guide the design and fabrication of selfshaping materials, the shape equations of bent configurations, twisted belts, and helices of slender chiral composite are developed using the variation method. Furthermore, it is numerically shown that the shape changes of a chiral composite can be tuned by the deformation of micro/nanohelices and the fabricated fiber directions. This work paves a new way to create self-shaping composites.

关键词： Self-shaping · Bioinspired chiral composites ·Micro/nanohelices · Tendrils

Recent advances in efficient computation of deep convolutional neural networks

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Frontiers of Information Technology & Electronic Engineering 2018年第1期19卷 64-77页

作者： jian CHENG Pei-song WANG Gang LI qing-hao HU Han-qing LU National Laboratory of Pattern Recognition Institute of Automation Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

Deep neural networks have evolved remarkably over the past few years and they are currently the fundamental tools of many intelligent *** the same time,the computational complexity and resource consumption of these networks continue to *** poses a significant challenge to the deployment of such networks,especially in real-time applications or on resource-limited ***,network acceleration has become a hot topic within the deep learning *** for hardware implementation of deep neural networks,a batch of accelerators based on a field-programmable gate array(FPGA) or an application-specific integrated circuit(ASIC)have been proposed in recent *** this paper,we provide a comprehensive survey of recent advances in network acceleration,compression,and accelerator design from both algorithm and hardware points of ***,we provide a thorough analysis of each of the following topics:network pruning,low-rank approximation,network quantization,teacher–student networks,compact network design,and hardware ***,we introduce and discuss a few possible future directions.

关键词： Deep neural networks Acceleration Compression Hardware accelerator

DETERMINATION OF DEGREE OF CRYSTALLINITY OF NYLON 1212 BY WIDE-ANGLE X-RAY DIFFRACTION

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Chinese Journal of Polymer Science 2004年第5期22卷 491-496页

作者： jian-binSong Min-qiaoRen qing-yongChen Shu-yunWang qing-xiangZhao Hong-fangZhang 莫志深 StateKeyLaboratoryofPolymerPhysicsandChemistry ChangchunInstituteofAppliedChemistryChineseAcademyofSciencesChangchun130022China CollegeofMaterialsEngineering Zhengzhou-UniversityZhengzhou450052China

Based on the X-ray scattering intensity theory and using the approximate expression for the atomic scattering factor, the correction factors for three crystalline peaks and an amorphous peak of Nylon 1212 were calculated and the formula of degree of crystallinity of Nylon 1212 was derived by a graphic multipeak resolution method. The degree of crystallinity calculated from the WAXD method is compatible with those obtained by density and calorimetry methods.

关键词： Degree of crystallinity WAXD Nylon 1212

New Families of Soliton and Periodic Solutions of Bose-Einstein Condensation in Linear Magnetic Field and Time-Dependent Laser Field

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Communications in Theoretical Physics 2005年第2X期44卷 209-212页

作者： MEI jian-Qin ZHANG Hong-qing Department of Applied Mathematics Dalian University of Technology Dalian 116024 China

By using a new generally projective Riccati equation method and with the help of symbolic computation,we consider a nonlinear Gross-Pitaevskii equation with weak bias magnetic and time-dependent laser fields. As a res... 详细信息

关键词： Bose-Einstein condensation Gross-Pitaevskii equation soliton solution periodic solution

Itinerant Topological Magnons in SU (2) Symmetric Topological Hubbard Models with Nearly Flat Electronic Bands

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Chinese Physics Letters 2021年第5期38卷 132-136页

作者： Zhao-Long gu jian-Xin Li National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

We show that a suitable combination of flat-band ferromagnetism,geometry and nontrivial electronic band topology can give rise to itinerant topological *** SU(2) symmetric topological Hubbard model with nearly flat electronic bands,on a Kagome lattice,is considered as the *** model exhibits ferromagnetic order when the lowest electronic band is *** the numerical exact diagonalization method with a projection onto this nearly flat band,we can obtain the magnonic *** the flat-band limit,the spectra exhibit distinct dispersions with Dirac points,similar to those of free electrons with isotropic hoppings,or a local spin magnet with pure ferromagnetic Heisenberg exchanges on the same ***,the non-flatness of the electronic band may induce a topological gap at the Dirac points,leading to a magnonic band with a nonzero Chern *** intriguingly,this magnonic Chern number changes its sign when the topological index of the electronic band is reversed,suggesting that the nontrivial topology of the magnonic band is related to its underlying electronic *** work suggests interesting directions for the further exploration of,and searches for,itinerant topological magnons.

关键词： Itinerant Topological Magnons in SU Symmetric Topological Hubbard Models with Nearly Flat Electronic Bands

Microstructure and properties of nano-laminated Y_(3)Si_(2)C_(2) ceramics fabricated via in situ reaction by spark plasma sintering

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Journal of Advanced Ceramics 2021年第3期10卷 578-586页

作者： Lin-Kun SHI Xiaobing ZHOU jian-qing DAI Ke CHEN Zhengren HUANG qing HUANG Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

A nano-laminated Y_(3)Si_(2)C_(2) ceramic material was successfully synthesized via an in situ reaction between YH_(2)and SiC using spark plasma sintering technology.A MAX phase-like ternary layered structure of Y_(3)Si_(2)C_(2) was observed at the atomic-scale by high resolution transmission electron *** lattice parameters calculated from both X-ray diffraction and selected area electron diffraction patterns are in good agreement with the reported theoretical *** nano-laminated fracture of kink boundaries,delamination,and slipping were observed at the tip of the Vickers *** elastic modulus and Vickers hardness of Y_(3)Si_(2)C_(2) ceramics(with 5.5 wt%Y_(2)O_(3)) sintered at 1500℃were 156 and 6.4 GPa,*** corresponding values of thermal and electrical conductivity were 13.7 W·m^(-1)·K^(-1) and 6.3×10^(5)S·m^(-1),respectively.

关键词： Y3Si_(2)C_(2) rare earth silicide carbides spark plasma sintering(SPS) ternary layered structure ceramic properties

Effect of pH values on the extracellular polysaccharide secreted by Acidithiobacillus ferrooxidans during chalcopyrite bioleaching

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International Journal of Minerals,Metallurgy and Materials 2014年第4期21卷 311-316页

作者： Run-lan Yu Jing Liu jian-xi Tan Wei-min Zeng Li-juan Shi guo-hua gu Wen-qing Qin guan-zhou Qiu School of Minerals Processing and Bioengineering Central South University Key Laboratory of Biometallurgy Ministry of Education Hunan Entry-Exit Inspection and Quarantine Bureau

The pH value plays an important role in the bioleaching of sulphide minerals. The effect of pH values on the extracellular poly-saccharide secreted by Acidithiobacillus ferrooxidans was investigated in different phases of bacterial growth during chalcopyrite bioleach-ing. It is found that extracellular polysaccharide secretion from the cells attached to chalcopyrite is more efficiently than that of the free cells in the bioleaching solution. Three factors, pH values, the concentration of soluble metal ions, and the bacterial growth and metabolism, affect extracellular polysaccharide secretion in the free cells, and are related to the bacterial growth phase. Extracellular polysaccharide secretion from the attached cells is mainly dependent on the pH value of the bacterial culture.

关键词： chalcopyrite bioleaching polysaccharides acidity Acidithiobacillusferrooxidans

Identifying file-sharing P2P traffic based on traffic characteristics

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The Journal of China Universities of Posts and Telecommunications 2008年第4期15卷 112-120页

作者： CHENG Wei-qing GONG jian DING Wei College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China School of Computer Science and Engineering Southeast University Nanjing 210096 China

This article focuses on identifying file-sharing peer-to-peer （P2P）（such as BitTorrent （BT）） traffic at the borders of a stub network. By analyzing protocols and traffic of applications, it is found that file-sharing P2P traffic of a single user differs greatly from traditional and other P2P （such as QQ） applications＇ traffic in the distribution of involved remote hosts and remote ports. Therefore, a method based on discreteness of remote hosts （RHD） and discreteness of remote ports （RPD） is proposed to identify BT-like traffic. This method only relies on flow information of each user host in a stub network, and no packet payload needs to be monitored. At intervals, instant RHD for concurrent transmission control protocol and user datagram protocol flows for each host are calculated respectively through grouping flows by the stub network that the remote host of each flow belongs to. On given conditions, instant RPD are calculated through grouping flows by the remote port to amend instant RHD. Whether a host has been using a BT-like application or not can be deduced from instant RHD or average RHD for a period of time. The proposed method based on traffic characteristics is more suitable for identifying protean file-sharing P2P traffic than content-based methods Experimental results show that this method is effective with high accuracy.

关键词： traffic identification concurrent flows P2P discreteness of remote hosts discreteness of remote ports

Unleashing the Power of Bio-based Thermotropic Liquid Crystal Modifiers:Toughening and Reinforcing Petroleum-based Epoxy Resin without Compromising Other Properties

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Chinese Journal of Polymer Science 2024年第8期42卷 1093-1102页

作者： qing-Yun Lu Hong-Wei gu Jia-Hui Li Qian-Qian Fan Bei-Tao Liu Yan Kou Xi-Gao jian Zhi-Huan Weng State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart MaterialsLiaoning Technology Innovation Center of High Performance Resin MaterialsDepartment of Polymer Science&EngineeringDalian University of TechnologyDalian 116024China Thermochemistry Laboratory Liaoning Province Key Laboratory of Thermochemistry for Energy and MaterialsDalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Toughening the petroleum-based epoxy resin blends with bio-based modifiers without compromising their modulus,mechanical strength,and other properties is still a big challenge in view of the *** this study,a bio-based liquid crystal epoxy resin(THMT-E P)with an s-triazine ring structure was utilized to modify a petroleum-based bisphenol A epoxy resin(E51)with 4,4'-diaminodiphenylsulfone(DDS)as a curing agent,and the blended systems were evaluated for their thermal stability,mechanical properties,and flame *** results showed that the impact strength of the blended system initially increased and then decreased with the increase in THMT-EP content,and it reached the a maximum value of 26.5 kJ/m^(2)when the THMT-EP content was 5%,which was 31.2%higher than that of E51/***,the flexural strength,modulus,and glass transition tem perature of the blended system were all simultaneously improved with the addition of *** the same time,the addition of THMT-EP enhanced the flame retardancy of the system by increasing the char yield at 700℃and decreasing the peak heat release rate and total heat release *** work paves the way for a more sustainable improvement in the comprehensive performance of epoxy resin.

关键词： Epoxy resin Toughening Bio-based Thermotropic liquid crystal