检索结果-南通市图书馆

Frontiers of physics 2021年第4期16卷 229-237页

作者： Hao cheng Jin-cheng zheng Department of Physics and the Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices Xiamen UniversityXiamen 361005China Department of Physics Xiamen University Malaysia439000 SepangSelangorMalaysia

Due to the noticeable structural similarity and being neighborhood in periodic table of group-IV and-V elemental monolayers,whether the combination of group-IV and-V elements could have stable nanosheet structures with optimistic properties has attracted great research *** this work,we performed first-principles simulations to investigate the elastic,vibrational and electronic properties of the carbon nitride(CN)nanosheet in the puckered honeycomb structure with covalent interlayer *** has been demonstrated that the structural stability of CN nanosheet is essentially maintained by the strong interlayerσbonding between adjacent carbon atoms in the opposite atomic layers.A negative Poisson’s ratio in the out-of-plane direction under biaxial deformation,and the extreme in-plane stiffness of CN nanosheet,only slightly inferior to the monolayer graphene,are ***,the highly anisotropic mechanical and electronic response of CN nanosheet to tensile strain have been explored.

关键词： carbon-nitride anisotropy Poisson’s ratio strain engineering in-plane strength interlayer bonding

INTEGRAL EQUATION METHOD'S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2008年第6期21卷 115-118页

作者： LI cheng zheng Yanping School of Mechanical Engineering Zhengzhou University Zhengzhou 450001 China

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.

关键词： Off-axis loads Conformal mapping Aperture question Complex hole-shape Analysis Stress function of multiple complex variables

Recent progress in functional modification and crosslinking of bioprosthetic heart valves

在线全文

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2024年第1期3卷 1-16页

作者： cheng zheng Li Yang Yunbing Wang National Engineering Research Center for Biomaterials Sichuan UniversityChengdu 610064China

Valvular heart disease(VHD),clinically manifested as stenosis and regurgitation of native heart valve,is one of the most prevalent cardiovascular diseases with high *** valve replacement surgery has been recognized as golden standard for the treatment of *** to the clinical application of transcatheter heart valve replacement technic and the excellent hemodynamic performance of bioprosthetic heart valves(BHVs),implantation of BHVs has been increasing over recent years and gradually became the preferred choice for the treatment of ***,BHVs might fail within 10-15 years due to structural valvular degeneration(SVD),which was greatly associated with drawbacks of glutaraldehyde crosslinked BHVs,including cytotoxicity,calcification,component degradation,mechanical failure,thrombosis and immune *** prolong the service life of BHVs,much effort has been devoted to overcoming the drawbacks of BHVs and reducing the risk of *** this review,we summarized and analyzed the research and progress on:(i)modification strategies based on glutaraldehyde crosslinked BHVs and(ii)nonglutaraldehyde crosslinking strategies for BHVs.

关键词： bioprosthetic heart valves modification crosslinking anticalcification antithrombosis

Asymmetrical Transport Distribution Function: Skewness as a Key to Enhance Thermoelectric Performance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research 2022年第4期2022卷 397-410页

作者： Jin-cheng Zhen Department of Physics Xiamen UniversityXiamen 361005China Department of Physics and Department of New Energy Science and Engineering Xiamen University MalaysiaSepang 43900Malaysia

How to achieve high thermoelectric figure of merit is still a scientific *** solving the Boltzmann transport equation,thermoelectric properties can be written as integrals of a single function,the transport distribution function(TDF).In this work,the shape effects of transport distribution function in various typical functional forms on thermoelectric properties of materials are systematically *** is found that the asymmetry of TDE,characterized by skewness,can be used to describe universally the trend of thermoelectric *** defining symmetric and asymmetric TDF functions,a novel skewness is then constructed for thermoelectric *** is demonstrated,by comparison with ab initio calculations and experiments,that the proposed thermoelectric skewness not only perfectly captures the main feature of conventional skewness but also is able to predict the thermoelectric power *** comparison confirms the unique feature of our proposed thermoelectric skewness,as well as its special role of connection between the statistics of TDF and thermoelectric properties of *** is also found that the thermoelectric performance can be enhanced by increasing the asymmetry of ***,it is also interesting to find that the thermoelectric transport properties based on typical quantum statistics(Fermi-Dirac distributions)can be well described by typical shape parameter(skewness)for classical statistics.

关键词： properties materials Fermi

Stochastic stability of fuzzy Markovian jump neural networks by multiple integral approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Intelligent Computing and Cybernetics 2018年第1期11卷 81-105页

作者： cheng-De zheng School of Science Dalian Jiaotong UniversityDalianChina

Purpose–The purpose of this paper is to develop a methodology for the stochastically asymptotic stability of fuzzy Markovian jumping neural networks with time-varying delay and continuously distributed delay in mean ***/methodology/approach–The authors perform Briat Lemma,multiple integral approach and linear convex combination technique to investigate a class of fuzzy Markovian jumping neural networks with time-varying delay and continuously distributed *** sufficient criterion is established by linear matrix inequalities ***–It turns out that the obtained methods are easy to be verified and result in less conservative conditions than the existing *** examples show the effectiveness of the proposed ***/value–The novelty of the proposed approach lies in establishing a new Wirtinger-based integral inequality and the use of the Lyapunov functional method,Briat Lemma,multiple integral approach and linear convex combination technique for stochastically asymptotic stability of fuzzy Markovian jumping neural networks with time-varying delay and continuously distributed delay in mean square.

关键词： Briat lemma Fuzzy neural networks Markovian jump Wirtinger-based integral inequality

Preparation and properties of silane coupling agent modified steel slag as functional filler for anti-corrosion coating

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第4期30卷 708-716页

作者： Wei-cheng zheng Wei-cheng Xu Hao Zhang Hao-xuan zheng Lin Wang zheng-ming cheng Yan-fei Ye Jun Lin Hong-ming Long School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling(Anhui University of Technology) Ministry of EducationMa’anshan 243002AnhuiChina School of Civil Engineering and Architecture Anhui University of TechnologyMa’anshan 243032AnhuiChina Department of Chemical and Biochemical Engineering Western UniversityLondonON N6A 3K7Canada Shanghai Baosteel New Building Materials Technology Co. Ltd.Shanghai 201900China Shougang Jingtang United Iron&Steel Co. Ltd.Tangshan 063200HebeiChina Zhanjiang Baosteel New Building Materials Technology Co. Ltd.Zhenjiang 524047GuangdongChina Guilin Hongcheng Mining Equipment Manufacture Co. Ltd.Guilin 541000GuangxiChina

The chemical composition and high wear resistance of steel slag(SS)make it a potential alternative to traditional inorganic fillers.3-Aminopropyltriethoxysilane(KH550)modified steel slag(MSS)was successfully prepared,and its application in epoxy(EP)anti-corrosion coating was *** to the grafting of silane coupling agent functional groups onto the surface of SS,MSS exhibited improved solubility in xylene organic solvent and reduced *** the MSS content was 15 wt.%,the contact angle of the MSS/EP composite coating was 101°,and the abrasion was only 0.07 g,compared with 56.2°and 0.13 g,respectively,for the pure EP *** corrosion resistance of coatings was investigated by performing the electrochemical test(impedance)after immersion in a 3.5 wt.%NaCl *** electrochemical test results showed that the impedance modulus of the 15 wt.%MSS/EP composite coating at low frequency(Z_(f)=0.01 Hz)was approximately 1.08×10^(7)Ωcm^(2),which was two orders of magnitude higher than that of the pure EP coating.

关键词： Steel slag Silane coupling agent Modification Epoxy coating Inorganic filler

Optical Properties of Filled Skutterudite ThFe_4P_(12)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第4期49卷 1049-1051页

作者： cheng zheng-Ze XU Bin cheng Ze Department of Physics Huazhong University of Science and Technology Wuhan 430074 China North China Institute of Water Conservancy and Hydroelectric Power Zhengzhou 450011 China Department of Physics Xianning College Xianning 437005 China

Full-PotentiaJ Linearized Augmented Plane Wave plus locaJ orbital method （FPLAPW ＋10） calculations are performed for ThFe4P12 in the filled skutterudite in order to investigate the optical properties and to show the origin of the different optical transitions. It is found that the band gap is indirect for ThFe4P12. Then the contributions of the different transition peaks are analyzed from the imaginary part of the dielectric function. In contrast to recent experimental expectations, our calculations are in good agreement with experimental reflection spectra and ε1 （ω） spectrum.

关键词： first-principle calculation filled skutterudite optical properties

Efficient oneM2M Protocol Conversion Platform Based on NB-IoT Access

在线全文

学校读者我要写书评

暂无评论

China Communications 2019年第11期16卷 56-69页

作者： Yonghua Li cheng zheng Siye Wang Key Laboratory of Universal Wireless Communications for Ministry of Education Beijing University of Posts and Telecommunications

The protocol is the foundation of IoT technology, which plays an important role in the IoT device interworking and interoperability. The 5 G wireless communication system provides large-scale NB-IoT terminals access with F-RAN, and the vertical industry applications need support for the device management. As one of the most influential protocol in the IoT application, the oneM2M protocol not only has a complete architecture, but also has an interface with other IoT protocols. Therefore, to bridge the gap between the operator and industrial enterprises, the main contributions of this paper are as follows: Firstly, a general multi-protocol conversion method is proposed based on oneM2M platform where the protocol classification is used in different scenarios. Secondly, the F-RAN architecture of oneM2M platform is designed and implemented with NB-IoT device access. Thirdly, a multiplexing scheme to process the device information is proposed for interworking proxy entity(IPE), which improves the conversion efficiency for different protocols. Finally, the feasibility and efficiency of the scheme are verified.

关键词： F-RAN oneM2M NB-IoT multi-protocol conversion

Quantum Stackelberg Duopoly with Continuous Distributed Incomplete Information

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第12期29卷 17-20页

作者： WANG Xia HU cheng-zheng Huazhong University of Science and Technology Wenhua College Wuhan 430074 Department of Physics Wuhan UniversityWuhan 430072

A general model of the quantum Stackelberg duopoly is constructed by introducing the"minimal"quantum structure into the Stackelberg duopoly with continuous distributed incomplete information,where both players only know the continuous distribution of the competitor's unit *** this model,the cases with complete information,discrete distributed incomplete information,and continuous distributed asymmetric information are all *** of different roles played by the total information uncertainty and the information asymmetry,the game exhibits some new interesting features,such as the total information uncertainty can counteract or improve the first-mover advantage according to the value of the quantum ***'s more,this general model will be helpful for the government to reduce the abuses of oligopolistic competition and to improve the economic efficiency.

关键词： incomplete Stackelberg Quantum

A Multi-phase Field Model for Static Recrystallization of Hot Deformed Austenite in a C–Mn Steel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2018年第2期31卷 208-215页

作者： Jun Zhang cheng-Wu zheng Dian-Zhong Li School of Chemistry and Materials Science University of Science and Technology of China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

A multi-phase-field model has been developed to simulate the microstructure evolution and kinetics of the austenite static recrystallization（SRX） in a C–Mn steel. In this model, the bulk free energy that coupling the deformation stored energy with a special interpolation function is incorporated. Both the deformed grain topology and the deformation stored energy have been included in order to investigate the influence of pre-deformation on the subsequent austenite SRX at different hot deformation levels. Diverse scenarios of microstructure evolution show different deformation-dependent recrystallized grain sizes. The transformation kinetics is then discussed by analyzing the overall SRX fraction and the average interface velocity on the recrystallization front.

关键词： Phase-field Static recrystallization Microstructure evolution Hot deformation Mesoscopic modeling