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Simulation of kinematic and workspace analysis of 3-PRS parallel manipulator

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International Journal of Modeling, Simulation, and Scientific Computing 2015年第1期6卷 111-122页

作者： y.d.Patel P.M.George department of Mechanical Engineering A.d.Patel Institute of Technology New Vallabh Vidyanagar GujaratIndia department of Mechanical Engineering Birla Vishvakarma Mahavidyalaya Engineering College Vallabh Vidyanagar India

In the present era,the competitive producers are forced to use maximally newer advanced technology and its effective fast implementation using various available tools for synthesis of new product *** of current state of art computer aided technology supports the creation of flexible assemblies and their built up though unified modular *** design of robotic mechanism is a complex process involving geometric,kinematic,singularity analyses during its synthesis *** present work is aimed at the effective utilization of CAx system Pro/Engineer tools for creation,ease in modifi-cation and analysis of spatial parallel *** degrees of freedom of 3-PRS parallel manipulator is obtained using mobility *** manipulator with 3-dOF with 3-PRS configuration is *** kinematics simulation of the robot is carried out using mechanism simulation and compared with closed form *** concept of reachable,orientation and dexterous workspace is *** tip coordinates obtained through simulation are plotted for workspace *** and outer workspace boundaries are developed and analyzed for four different cases to understand the problem of interior singularity within workspace.

关键词： Parallel manipulator mobility constraints workspace

Role of Biologics in the development of Autoimmune Hepatitis: A Review

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Journal of Clinical and Translational Hepatology 2018年第4期6卷 402-409页

作者： Leon d.Averbukh George y.Wu department of Medicine Division of Gastroenterology-HepatologyUniversity of Connecticut Health CenterFarmingtonCTUSA

Autoimmune hepatitis(AIH)is a cause of chronic,immunemediated liver injury which without treatment may progress to end-stage liver *** disease state,characterized by elevations in liver enzymes,autoantibodies,and interface hepatitis on histology,has been noted to be induced by a wide range of ***,most commonly minocycline and nitrofurantoin,have long been established as potential inducers of ***,biologics,powerful immune-modulators,have also been reported to induce *** conclude that there is an association between administration of biologics in the development of AIH,and whether the relationship is causal will require appropriate studies in the future.

关键词： Autoimmune hepatitis TNF alpha inhibitors Biologics Hepatitis Infliximab Adalimumab Etanercept

Evidence for Viral Induction of Biliary Atresia: A Review

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Journal of Clinical and Translational Hepatology 2018年第4期6卷 410-419页

作者： Leon d.Averbukh George y.Wu department of Medicine Division of Gastroenterology-HepatologyUniversity of Connecticut Health CenterFarmingtonCTUSA

Biliary atresia(BA)is a childhood disease which manifests with abnormal narrowing,blockage or complete absence of bile ducts within the *** possible etiologies have been reported for the development of BA,including congenital,perinatal and acquired *** the 1970's,there has been increasing evidence linking BA development to viral perinatal *** viral vectors most commonly implicated include members of the herpesviridae family(cytomegalovirus and Epstein-Barr virus)as well as those of the reoviridae family(reovirus and rotavirus).While extensive work has been done on a murine model of disease,the current review focuses primarily on evidence from human studies of viral vectors in children afflicted with BA.

关键词： Biliary atresia Cytomegalovirus Epstein-Barr virus Reovirus Rotavirus

Application of Exp-function Method to Wave Solutions of the Sine-Gordon and Ostrovsky Equations

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Acta Mathematicae Applicatae Sinica 2016年第3期32卷 571-578页

作者： R.A.TALARPOSHTI S.E.GHASEMI y.RAHMANI d.d.GANJI department of Mathematics Faculty of Mathematical SciencesMazandaran University young Reseachers and Elite Club Sari BranchIslamic Azad University department of Mechanical Engineering Babol University of Technology

In this work, the Exp-function method is employed to find new wave solutions for the Sine-Gordon and Ostrovsky equation. The equations are simplified to the nonlinear partial differential equations and then different types of exact solutions are extracted by this method. It is shown that the Exp-function method is a powerful analytical method for solving other nonlinear equations occurring in nonlinear physical phenomena. Results are presented in contour plots that show the different values of effective parameters on the velocity profiles.

关键词： exp-function method nonlinear equation wave solutions Sine-Gordon equation Ostrovsky equation

^(199)Sn ANd ^(57)Fe MOSSBAUER SPECTROSCOPIC STUdy OF THE MECHANICALLy ALLOyEd Fe-Sn ALLOyS

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Acta Metallurgica Sinica(English Letters) 1998年第5期11卷 335-341页

作者： y.Z.yang y.L.Zhu Q.S.Li X.M.Ma y.d.dong y.Z.Chuang Guangdong Univ of Technology Guangzhou China

Nanocrystalline supersaturated solid solutions (Sa in Fe) with Sn content less than 50 at. %,and FeSn2 and Fe1.3Sn intermetallic compounds have been prepared by mechanical alloying of Fe and Sn mixture powders with composition of Fe1-xSnx (x≤0.5).The atomic alloying the formation and microstructure, especially the coordination environments, of the resultant alloys have been studied by X-ray diffraction, 57Fe and 119Sn Mossbauer Spectroscopy and diffrrential scanning calorimetry. The Fe and Sn coordination environments and the composition dependence of the hyperfine parameters on the Fe and Sn content have been fully discussed with respect to the solid dissolution alloying, grain refinement, and distortion caused or induced by mechanical alloying.

关键词： mechanical alloying Mossbauer effect nanocrystalline Fe-Sn alloy

Anisotropic Electroplastic Effects on the Mechanical Properties of a Nano-Lamellar Austenitic Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2021年第4期34卷 534-542页

作者： y.R.Ma H.J.yang d.d.Ben X.H.Shao y.Z.Tian Q.Wang Z.F.Zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Sciences and Technology of ChinaHefei230026China Shenyang National Laboratory of Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang110016China

Effects of electropulsing treatment(EPT)on the microstructural evolution and mechanical properties of a cold-rolled 316 L austenitic stainless steel with nano-lamellar structure were *** EPT experiments were carried out with the electric current direction along the rolling direction(Rd)and the transverse direction(Td)of the samples,*** anisotropic electroplastic effects for the Rd and Td specimens,i.e.,reduced hardness/strength and enhanced ductility,were obtained owing to the different recrystallization behaviors of the Rd and Td specimens during *** Rd specimens after EPT with larger recrystallized grain size and higher volume fraction of recrystallization show lower strength and higher elongation than that of the Td *** main reason might be attributed to the change of the current direction in the two kinds of samples,which results in the different sensitivity of the microstructures to thermal and athermal effects during EPT.

关键词： Stainless steel Electroplastic effect Electropulsing Recrystallization Anisotropy Strength Plasticity

Multi-channel retarding field analyzer for EAST

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Plasma Science and Technology 2018年第5期20卷 1-5页

作者： M HENKEL d HOSCHEN y LIANG y LI S C LIU d NICOLAI N SANdRI G SATHEESWARAN N yAN H X ZHANG the EAST team Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung–PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)D-52425 JulichGermany Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China

A multi-channel retarding field analyzer（MC-RFA） including two RFA modules and two Langmuir probes to measure the ion and electron temperature profiles within the scrape-off layer was developed for investigations of the interplay between magnetic topology and plasma transport at the plasma *** MC-RFA probe for the stellarator W7-X and first measurements at the tokamak EAST was *** probe head allows simultaneous multichannel ion temperature as well as for electron temperature *** usability for radial correlation measurements of the measured ion currents is also given.

关键词： retarding field analyzer multi-channel EAST ion temperature diagnostic

Bio-amelioration of alkali soils through agroforestry systems in central Indo-Gangetic plains of India

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Journal of Forestry Research 2014年第4期25卷 887-896页

作者： y.P.Singh Gurbachan Singh d.K.Sharma Central Soil Salinity Research Institute Regional Research StationLucknow (U.P.) 226005 India Indian Council of Agricultural Research New Delhi 110001 India Central Soil Salinity Research Institute Karnal Haryana 132001 India

A long-term field study was initiated during 1995 at Central Soil Salinity Research Institute, Regional Research Station, Lucknow （26047＇58＂ N and 80°46＇24＂ E） to analyze the effect of agroforestry systems on amelioration of alkali soils. Three agroforestry systems （pas- toral, silvipastoral and silvicultural） were compared with the control where no agroforestry system was introduced. Tree-based silvicultural and silvipastoral systems were characterized by tree species Prosopis juliflora and Acacia nilotica along with grass species Leptochloafusca, Panicum maximum, Trifolium alexandrium and Chloris gayana. Growth of ten-year-old Prosopis juliflora and Acacia nilotica planted in combi- nation with grasses was significantly higher over the silviculture system with the same species. Tree biomass yields of P. juliflora （77.20 t·ha-1） and A. nilotica （63.20 t·ha-1） planted under silvipastoral system were significantly higher than the sole plantation of （64.50 t·ha-1 and 52.75 t·ha-1）. Fodder yield under the pastoral system was significantly higher than the silvipastoral system during initial years but it was at par with that of silvipastoral systems after eight years of plantation. The microbial biomass carbon in the soils of silvipastoral systems was significantly higher than in soils under sole plantation of trees and control systems. The Prosopis-based silvipastoral system proved more effective in reduc- ing soil pH, displacing Na＋ from the exchange complex, increasing or- ganic carbon and available N, P and K. Improvement in soil physical properties such as bulk density, porosity, soil moisture and infiltration rate was higher in the Prosopis-based silvipastoral system than in the silviculture system or control On the basis of biomass production and improvement in soil health due to tree ＋ grass systems, silvipastoral agroforestry system could be adopted for sustainable reclamation ofhighly alkali soils.

关键词： agroforcstry systems alkali soils biomass production mi-crobial biomass soil amelioration

Random-Gate-Voltage Induced Al'tshuler–Aronov–Spivak Effect in Topological Edge States

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Chinese Physics Letters 2021年第11期38卷 7-12页

作者： Kun Luo Wei Chen Li Sheng d.y.Xing National Laboratory of Solid State Microstructures and School of Physics Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Helical edge states are the hallmark of the quantum spin Hall insulator. Recently, several experiments have observed transport signatures contributed by trivial edge states, making it difficult to distinguish between the topologically trivial and nontrivial phases. Here, we show that helical edge states can be identified by the randomgate-voltage induced Φ_(0)/2-period oscillation of the averaged electron return probability in the interferometer constructed by the edge states. The random gate voltage can highlight the Φ_(0)/2-period Al'tshuler–Aronov–Spivak oscillation proportional to sin^(2)(2πΦ/Φ_(0)) by quenching the Φ_(0)-period Aharonov–Bohm oscillation. It is found that the helical spin texture induced π Berry phase is key to such weak antilocalization behavior with zero return probability at Φ = 0. In contrast, the oscillation for the trivial edge states may exhibit either weak localization or antilocalization depending on the strength of the spin-orbit coupling, which has finite return probability at Φ = 0. Our results provide an effective way for the identification of the helical edge states. The predicted signature is stabilized by the time-reversal symmetry so that it is robust against disorder and does not require any fine adjustment of system.

关键词： AAS Spivak Effect in Topological Edge States Aronov Random-Gate-Voltage Induced Al'tshuler