检索结果-南通市图书馆

Electromagnetic effects on anisotropic expansion-free fluid content

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2023年第10期75卷 79-89页

作者： z Yousaf h Asad Bander Almutairi Adnan Malik Department of Mathematics University of the PunjabQuaid-i-Azam CampusLahore-54590Pakistan Department of Mathematics College of ScienceKing Saud UniversityP.O.Box 2455 Riyadh 11451Saudi Arabia School of Mathematical Sciences Zhejiang Normal UniversityJinhuaZhejiangChina

The major goal of this work is to find solutions of Einstein–Maxwell field equations for anisotropic,expansion-free,non-static,spherically distributed matter *** analytical models that highlight the major benefit of simplicity are shown and this makes it possible to use them as a toy model to illustrate how cavities ***,the transport equations,quasi-homologous constraints and the junction conditions are also evaluated along with their useful ***,the consequences of electric force on this system are summed up in the last section.

关键词： gravitation neutron stars modified gravity hydrodynamics voids

FINITE ELEMENT ANALYSIS FOR MICROSTRUCTURE EVOLUTION IN hOT FINIShING ROLLING OF STEEL STRIPS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2007年第2期20卷 79-86页

作者： z.D. Qu S.h. zhang D.z. Li z.T. Wang Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China College of Material Science and Engineering Taiyuan University of Science andTechnology Taiyuan 030024 China Shenyang Ligong University Shenyang 110168 China

A computer model that describes the evolution of microstructures during the hot finishing rolling of SS400 steel has been proposed. It has been found that the microstructure strongly depends on processing of materials and on their parameters, which affected the history of the thermomechanical variables, such as temperature, strain, and strain rate. To investigate the microstructural evolutions during the hot finishing rolling process, the rigid-thermoviscoplastic finite element method （FEM） has been combined with dynamic recrystallization, static recrystallization, and grain growth models. The simulation results show a good agreement with those from the prediction software online.

关键词： finite element method (FEM) finishing rolling microstructure evolution recrystallization

Optical Anisotropy of InAs Monolayer in (311)-Oriented GaAs Matrix

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1997年第12期14卷 932-935页

作者： Y.h.Chen z.yang XU Bo WANG zhan-guo LIANG Ji-ben Department of Physics Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong Laboratory of Semiconductor Materials Science lnstitute of SemiconductorsChinese Academy of SciencesBeijing 100083 On leave from Laboratory of Semiconductor Materials Science Institute of SemiconductorsChineseAcademy of SciencesBeijing 100083

In-plane optical anisotropy which comes from the heavy hole and the light hole transitions in an InAs monolayer inserted in(311)-oriented GaAs matrix is observed by reflectance difference *** observed steplike density of states demonstrates that the InAs layer behaves like a two-dimensional quantum well rather than isolated quantum *** magnitude of the anisotropy is in good agreement with the intrinsic anisotropy of(311)orientation quantum wells,indicating that there is little structural or strain anisotropy of the InAs layer grown on(311)-oriented GaAs surface.

关键词： anisotropy quantum reflectance

An efficient method for computing excess free energy of liquid

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

Science China Chemistry 2018年第1期61卷 135-140页

作者： Jianing Song Linqiong Qiu John z.h. zhang School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China NYU-ECNU Center for Computational Chemistry at NYU ShanghaL Shanghai 200062 China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062 China Department of Chemistry New York University NY NY 10003 USA

We present a new theoretical method for efficient calculation of free energy of liquid. This interaction entropy method allows one to compute entropy and free energy of liquid from standard single step MD(molecular dynamics) simulation directly in liquid state without the need to perform MD simulations at many intermediate states as required in thermodynamic integration or free energy perturbation methods. In this new approach, one only needs to evaluate the interaction energy of a single(fixed) liquid molecule with the rest of liquid molecules as a function of time from a standard MD simulation of liquid and the fluctuation of distribution of this interaction energy is then used to calculate the interaction entropy of the liquid. Explicit theoretical derivation of this interaction entropy approach is provided and numerical calculations for the benchmark liquid water system were carried out using three different water models. Numerical analysis of the result was performed and comparison of the computational result with experimental data and other theoretical results were provided. Excellent agreement of calculated free energies with the experimental data using TIP4 P model is obtained for liquid water.

关键词： excess free energy liquid MD simulation interaction entropy

VOLUMETRIC MASS TRANSFER COEFFICIENT BETWEEN SLAG AND METAL IN COMBINED BLOWING CONVERTER

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2005年第2期18卷 91-95页

作者： z.h.Wu z.S.zou W.Wu SchoolofMaterialsandMetallurgy NortheasternUniversityShenyang110004China CentralIron＆SteelResearchInstitute Beijing100081China

The effects of operation parameters of combined blowing converter on the volumetric mass transfer coefficient between slag and steel are studied with a cold model with water simulating steel, oil simulating slag and benzoic acid as the transferred substance between water and oil. The results show that, with lance level of 2.1m and the top blowing rate of 25000Nm3/h, the volumetric mass transfer coefficient changes most significantly when the bottom blowing rate ranges from 384 to 540Nm3/h. The volumetric mass transfer coefficient reaches its maximum when the lance level is 2.1m, the top blowing rates is 30000Nm3/h, and the bottom blowing rate is 384Nm3/h with tuyeres located symmetrically at 0.66D of the converter bottom.

关键词： combined blowing converter cold modeling volumetric mass transfer coefficient operational parameter

Microstructural Evolution and Mechanical Properties of Laminated CuAl Composites Processed by Accumulative Roll-Bonding and Annealing

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2021年第7期34卷 925-931页

作者： h.R.Lin Y.z.Tian S.J.Sun z.F.zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China

Nano structured Cu-/Al-laminated composites were processed by accumulative roll-bonding(ARB)technique for four *** evolutions inside the Cu and Al layers and the interfacial reactions were revealed after annealing at different *** and recrystallization occurred in the Cu and Al layers at low annealing temperatures,and three kinds of intermetallic compounds formed near the *** mechanical properties of these composites after annealing were investigated by tensile tests,and the variation of strength-ductility synergy was comprehensively discussed by considering the roles of constituent and the intermetallic compounds.

关键词： CuAl composites Accumulative roll-bonding(ARB) Annealing Intermetallic compounds Ductility

Microstructure and Mechanical Properties of X80 Pipeline Steel Joints by Friction Stir Welding Under Various Cooling Conditions

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2020年第1期33卷 88-102页

作者： G.M.Xie R.h.Duan P.Xue z.Y.Ma h.L.Liu z.A.Luo State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

X80 pipeline steel plates were friction stir welded(FSW)under air,water,liquid CO2+water,and liquid CO2 cooling conditions,producing defect-free *** microstructural evolution and mechanical properties of these FSW joints were *** granular bainite was observed in the nugget zone(Nz)under air cooling,and lath bainite and lath martensite increased signifi cantly as the cooling medium temperature *** particular,under the liquid CO2 cooling condition,a dual phase structure of lath martensite and fi ne ferrite appeared in the *** to the case under air cooling,a strong shear texture was identifi ed in the Nzs under other rapid cooling conditions,because the partial deformation at elevated temperature was retained through higher cooling *** liquid CO2 cooling,the highest transverse tensile strength and elongation of the joint reached 92%and 82%of those of the basal metal(BM),respectively,due to the weak tempering softening.A maximum impact energy of up to 93%of that of the BM was obtained in the Nz under liquid CO2 cooling,which was attributed to the operation of the dual phase of lath martensite and fi ne ferrite.

关键词： Friction stir welding Pipeline steel Microstructure Mechanical properties Cooling

SOLIDIFICATION OF NICKEL-BASED SINGLE CRYSTAL SUPERALLOY BY ELECTRIC FIELD

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2005年第6期18卷 679-685页

作者： Y.S. yang X.h. Feng G.F. Cheng Y.J. Li z.Q. hu Institute of Metal Research The Chinese Academy of Sciences Shenyang 110016China

The crystal growth of a nickel-based single crystal superalloy DD3 was researched via controlled directional solidification under the action of a DC electric field. The cellular or dendrite spacing of the single crystal superalloy is refined and microsegregation of alloying elements Al, Ti, Mo and W, is reduced by the electric field. The electric field decreases the interface stability and reduces the critical growth rate of the ceUular-dendritic translation because of Thomson effect and Joule heating. The precipitation of the γ＇ phase is more uniform and the size of the γ＇ phase is smaller with the electric field than that without the electric field.

关键词： single crystal superalloy DC electric field crystal growth segregation,γ' phase

RhEOLOGY FEATURE OF SIMPLE METAL MELT

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2007年第3期20卷 181-186页

作者： C.J. Sun h.R. Geng Y.S. Shen X.Y. Teng z.X. yang Key Laboratory of Liquid Structure and heredity of Materials Ministry of Education Shandong University Jinan 250061 China School of Material Science and Engineering Jinan University Jinan 250022 China

The rheology feature of Sb, Bi melt and alloys was studied using coaxial cylinder high-temperature viscometer. The results showed that the curve of torsion-rotational speed for Sb melt presents a linear relation in all measured temperature ranges, whereas for the Bi melt, the curve presents obvious non-Newtonian feature within the low temperature range and at relative high shear stress. The rheology feature of Sb80Bi20 and Sb20Bi80 alloy melts was well correlated with that of Sb and Bi, respectively. It is considered that the rheology behavior of Sb melt plays a crucial role in Sb80Bi20 alloy and that of Bi melt plays a crucial role in Sb20Bi80 alloy.

关键词： Newtonian liquid rheology melt Bi Sb