检索结果-南通市图书馆

线状李超代数L_(n,m)上的yang-Baxter方方程

在线全文

学校读者我要写书评

暂无评论

纯粹数学与应用数学 2016年第5期32卷 536-545页

作者：杨勇刘文德哈尔滨师范大学数学科学学院黑龙江哈尔滨150025

在特征零的代数闭域上,首先做出L_(n,m)的一个空间的直和分解,从而将L_(n,m)上的yang-Baxter方程的解分为若干情形.然后分别在每种情形下对yang-Baxter方程进行求解,进而得到了L_(n,m)上的所有的yang-Baxter方程的解的矩阵形式.

关键词： yang-Baxter方程幂零李超代数线状李超代数

A FINITE-ELEmENT ANALYSIS OF ELECTROmAGNETIC SHEET mETAL-EXPANSION PROCESS

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1998年第3期8卷 135-140页

作者： Huang, SY Chang, ZH Wang, ZR Wang, LF yang, m Wuhan Automot Polytech Univ Sch Mat Engn Wuhan 430070 Peoples R China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150006 Peoples R China

１ＩＮＴＲＯＤＵＣＴＩＯＮＥｌｅｃｔｒｏｍａｇｎｅｔｉｃｆｏｒｍｉｎｇ，ｅｓｅｎｔｉａｌｙｂｅｉｎｇａｋｉｎｄｏｆａｐｐｌｉｃａｔｉｏｎｏｆｉｍｐｕｌｓｅｉｎｔｅｎｓｉｖｅｃｕｒｅｎｔｔｅｃｈｎｉｑｕｅｉｎｍｅｔａｌ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＥｌｅｃｔｒｏｍａｇｎｅｔｉｃｆｏｒｍｉｎｇ，ｅｓｅｎｔｉａｌｙｂｅｉｎｇａｋｉｎｄｏｆａｐｐｌｉｃａｔｉｏｎｏｆｉｍｐｕｌｓｅｉｎｔｅｎｓｉｖｅｃｕｒｅｎｔｔｅｃｈｎｉｑｕｅｉｎｍｅｔａｌｗｏｒｋｉｎｇ，ｄｅａｌｓｗｉｔｈ...

关键词： finite element analysis electromagnetic forming magnetic pressure

Eutectic-reaction brazing of Al_(0.3)CoCrFeNi high-entropy alloys using Ni/Nb/Ni interlayers

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2022年第26期121卷 245-255页

作者： Y.Lei J.Sun X.G.Song m.X.yang T.L.yang J.Yin State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Beijing Power machinery Institute Beijing 100074China Sichuan Aerospace Changzheng Equipment manufacturing Co. Ltd.Chengdu 610100China

In this study,a novel eutectic-reaction brazing of Al_(0.3)CoCrFeNi high-entropy alloys(HEAs)^(1)was investigated with a design of laminated Ni/Nb/Ni *** typical Al_(0.3)CoCrFeNi brazing seam consisted of proeutecticγ,the lamellar eutectic structure composed of face-centered cubic(FCC)phase(eutecticγ)and C14 Laves,as well as a few amounts of Nb based solid solution.A high density of nanoscale ordered L1_(2)(γ)phase was precipitated withinγphase *** the brazing temperature raised from 1200 to 1320℃,the dissolution volume of Al_(0.3)CoCrFeNi alloy into Ni-Nb liquid was *** microstructure of the brazing seam changed from hypereutectic(blocky Laves+γphase)to eutectic(Laves+eutecticγ)to hypoeutectic structures(proeutecticγ+Laves/γeutectic structure).The shear strength of joints was increased gradually due to the formation of eutectic lamellae and the cellular growth of proeutecticγ*** maximum shear strength of the joint brazed at 1320℃for 10 min was up to 592 mPa,reaching 95%of the base *** joint mainly ruptured in the soft proeutecticγphase in a ductile fracture mode.

关键词： High-entropy alloys Brazing Eutectic structure Shear strength

Transfer or blockage:Unraveling the interaction between deformation twinning and grain boundary in tantalum under shock loading with molecular dynamics

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2023年第25期156卷 118-128页

作者： Z.C.meng m.m.yang A.H.Feng S.J.Qu F.Zhao L.yang J.H.Yao Y.yang Q.B.Fan H.Wang Interdisciplinary Centre for Additive manufacturing (ICAm) School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai 200093China Institute of metal Research Chinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of materials Science and Engineering Tongji UniversityShanghai 201804China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China National Key Laboratory of Science and Technology on materials Under Shock and Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401135China

The interaction between{112}deformation twinning and grain boundary in coaxial polycrystalline tantalum under shock compression was studied with molecular dynamics simulation under different grain pair misorientation angles(mA)and geometric compatibility factor(m’).Generally,in the coaxial polycrystal,the value of mA determines the occurrence of twin transfer(TT)or twin blockage(TB),i.e.,twin transfer occurs at mA≤29°with twin blockage *** TT,the value of m’affects the selection of twin variants.,i.e.,the twin system with a larger m’is easier to *** morphology of twin pairs is ruler-shaped and lenticular under TT and TB,respectively,with different thickening mechanisms,including grain boundary dislocation emission.

关键词： Plasticity Grain boundary Twin Atomistic simulation Tantalum

Topological Knots in Quantum Spin Systems

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第6期38卷 7-12页

作者： X.m.yang L.Jin Z.Song School of Physics Nankai UniversityTianjin 300071China

Knot theory provides a powerful tool for understanding topological matters in biology,chemistry,and *** knot theory is introduced to describe topological phases in a quantum spin *** solvable models with long-range interactions are investigated,and majorana modes of the quantum spin system are mapped into different knots and *** topological properties of ground states of the spin system are visualized and characterized using crossing and linking numbers,which capture the geometric topologies of knots and *** interactivity of energy bands is *** gapped phases,eigenstate curves are tangled and braided around each other,forming *** gapless phases,the tangled eigenstate curves may form *** findings provide an alternative understanding of phases in the quantum spin system,and provide insights into one-dimension topological phases of matter.

关键词： topological quantum system

Coherent Acoustic Phonon and Its Chirping in Dirac Semimetal Cd_3As_2

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2018年第11期35卷 56-60页

作者： Fei Sun m.yang m W yang Q.Wu H.Zhao X.Ye Youguo Shi Jimin Zhao Beijing National Laboratory for Condensed matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190 School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049

Ultrafast optical spectroscopy of a single crystal of a Dirac semimetal Cd_3As_（2 ）is carried *** acoustic phonon（AP）mode with central frequency f=0.037 THz（i.e.,1.23 cm^（-1）or 0.153 meV）is unambiguously generated and detected,which we attribute to laser-induced thermal *** AP chirping（i.e.,variation of the phonon frequency）is clearly detected,which is ascribed to heat capacity variation with *** comparing our experimental results and the theoretical model,we obtain a chirping time constant,which is 31.2 ps at 6 K and 19.8 ps at 300 K,***,we identify an asymmetry in the AP frequency domain peak and find that it is caused by the chirping,instead of a Fano ***,we experimentally demonstrate that the central frequency of AP is extremely stable with varying laser fluence,as well as temperature,which endows Cd_3As_2application potentials in thermoelectric devices.

关键词： As Cd AP Coherent Acoustic Phonon and Its Chirping in Dirac Semimetal Cd3As2

A Hybrid Lattice Boltzmann Flux Solver for Simulation of Viscous Compressible Flows

在线全文

学校读者我要写书评

暂无评论

Advances in Applied mathematics and mechanics 2016年第6期8卷 887-910页

作者： L.m.yang C.Shu J.Wu State Key Laboratory of Aerodynamics China Aerodynamics Research and Development CenterMianyang 621000China Department of Aerodynamics College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsYudao StreetNanjing 210016China Department of mechanical Engineering National University of Singapore10 Kent Ridge CrescentSingapore 119260Singapore

In this paper,a hybrid lattice Boltzmann flux solver(LBFS)is proposed for simulation of viscous compressible *** the solver,the finite volume method is applied to solve the Navier-Stokes *** from conventional Navier-Stokes solvers,in this work,the inviscid flux across the cell interface is evaluated by local reconstruction of solution using one-dimensional lattice Boltzmann model,while the viscous flux is still approximated by conventional smooth function *** present work overcomes the two major drawbacks of existing LBFS[28–31],which is used for simulation of inviscid *** first one is its ability to simulate viscous flows by including evaluation of viscous *** second one is its ability to effectively capture both strong shock waves and thin boundary layers through introduction of a switch function for evaluation of inviscid flux,which takes a value close to zero in the boundary layer and one around the strong shock *** experiments demonstrate that the present solver can accurately and effectively simulate hypersonic viscous flows.

关键词： Lattice Boltzmann flux solver hybrid 1D lattice Boltzmann model switch function

Finite Element Analysis of Push-Out Test of SiC Fiber Reinforced Titanium matrix Composites

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

稀有金属材料与工程 2009年第A03期38卷 50-53页

作者： Yuan m N yang Y Q Huang B Zhang R J School of materials Northwestern Polytechnical University Xi＇an 710072 China

Based on the interphase layer model and the spring layer model, an improved interface model was developed to evaluate the interfacial shear strength of Titanium matrix composites(TmCs) and to analyze the effects of various parameters on the interfacial properties. The results showed that the improved interface model is more suitable for calculating the interfacial properties of SiC fiber reinforced titanium matrix composites. The interfacial shear strength of SiC/Timetal-834 predicted is 500 mPa. In addition, in order to better understand the interfacial properties of composites, some push out phenomenon were analyzed.

关键词：复合材料剪切强度碳化硅纤维物理性能

Development and Comparative Studies of Three Non-free Parameter Lattice Boltzmann models for Simulation of Compressible Flows

在线全文

学校读者我要写书评

暂无评论

Advances in Applied mathematics and mechanics 2012年第4期4卷 454-472页

作者： L.m.yang C.Shu J.Wu Department of Aerodynamics College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsYudao StreetNanjing 210016JiangsuChina Department of mechanical Engineering National University of Singapore10 Kent Ridge CrescentSingapore 119260Singapore

This paper at first shows the details of finite volume-based lattice Boltzmann method(FV-LBm)for simulation of compressible flows with shock *** the FV-LBm,the normal convective flux at the interface of a cell is evaluated by using one-dimensional compressible lattice Boltzmann model,while the tangential flux is calculated using the same way as used in the conventional Euler *** paper then presents a platform to construct one-dimensional compressible lattice Boltzmann model for its use in *** platform is formed from the conservation forms of *** the platform,both the equilibrium distribution functions and lattice velocities can be determined,and therefore,non-free parameter model can be *** paper particularly presents three typical non-free parameter models,D1Q3,D1Q4 and *** performances of these three models for simulation of compressible flows are investigated by a brief analysis and their application to solve some one-dimensional and two-dimensional test *** results showed that D1Q3 model costs the least computation time and D1Q4 and D1Q5 models have the wider application range of mach *** the results,it seems that D1Q4 model could be the best choice for the FVLBm simulation of hypersonic flows.

关键词： FV-LBm non-free parameter models compressible inviscid flows