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检索条件"机构=Univ.Porto"
18900 条 记 录,以下是4991-5000 订阅
排序:
Equilibrium Phase Constituents and Discontinuous Precipitation Behavior of Al-Zn-Cu Alloy with Symmetrical Composition
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Journal of Materials Science & Technology 2003年 第5期19卷 419-421页
作者: Shiming HAO, Yuping REN, Hua DING, Dapeng WANG, Gang ZHAO and Hongxiao LISchool of Materials and Metallurgy, Northeastern university, Shenyang 110004, China Sch. of Mat. and Metall. Northeastern Univ. Shenyang 110004 China
Through microstructure observation and X-ray diffraction analysis, the equilibrium phase constituents of Al-Zn alloy that contains 2 at. pct Cu at room temperature have been determined as Al-based solid solution (α),... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
MOTIONS OF ALLOYING ADDITIONS IN GAS STIRRED LADLES
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Acta Metallurgica Sinica(English Letters) 2001年 第5期14卷 359-367页
作者: S.C. Fan, B.K. Li and J.C. He Department of Thermal Engineering, Northeastern university, Shenyang 110004, China Dept. of Thermal Eng. Northeastern Univ. Shenyang 110004 China
A mathematical model has been developed to analyze the flow patterns and subsurface trajectories of spherical shaped particles (alloy additions) in gas stirring ladles. First, a numerical method to solve fluid flow ... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Phase formation regularities in Fe-based nanometer powders prepared by gas evaporation process
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中国有色金属学会会刊:英文版 2001年 第5期11卷 725-728页
作者: 陈振华 严红革 陈刚 康智涛 黄培云 Cent S univ Dept Mat Sci & Engn Changsha 410083 Peoples R China
A serials of Fe based nanometer powders were fabricated by reduced pressure gas evaporation process with induction current as the heating source. The formation regularities of the phases in as prepared powders and the... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Surface acoustic wave sensor system applied to the kinetic study of urease in plant seeds
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Chinese Journal of Chemistry 1995年 第3期13卷 231-240页
作者: LIU, DZ CHEN, K GE, K NIE, LH YAO, SZ HUNAN univ NEW MAT RES INSTCHANGSHA 410082PEOPLES R CHINA
A new type of the surface acoustic wave (SAW) sensor system was delivered. Urease from several kinds of plant seeds was extracted with different extracting solvents. The urease activity, Michaelis constant and other k... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Characteristics on Cerium Promoted Iron Based Catalyst forDehydrogenation Ethylbenzene to Styrene
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Journal of Rare Earths 1996年 第2期14卷 81-87页
作者: 祝以湘 胡云行 XIAMEN univ COLL CHEM & CHEM ENGNXIAMEN 361005PEOPLES R CHINA
it was found by XPS and XRD that cerium existed as CeO_2 in iron based catalyst for dehydrogenation of ethylbenzene to styrene. and CeO_2 can be partly reduced under the reaction conditions to create Ce(3+)/Ce(4+) red... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
ADSORPTION AND ACTIVATION OF METAL IONS ON KYANITE
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中国有色金属学会会刊:英文版 1996年 第3期6卷 22-24页
作者: Dong Hongjun Chen Jin(Department of Mineral Engineering,Central South university of Technology, Changsha 410083) CENT S univ TECHNOL DEPT MINERAL ENGNCHANGSHA 410083PEOPLES R CHINA
ADSORPTIONANDACTIVATIONOFMETALIONSONKYANITE¥DongHongjun;ChenJin(DepartmentofMineralEngineering,CentralSouthU... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Synthesis and Structure Determination of Yttrium Alkoxides and Alkoxy Yttrium Monomers with Double Bond
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Journal of Rare Earths 1996年 第1期14卷 1-7页
作者: 生瑜 陈利永 章文贡 FUJIAN NORMAL univ INST POLYMER SCIFUZHOU 350007PEOPLES R CHINA
Ten alkoxy yttrium monomers with double bond,Y(OR) 3-n(OCOCH=CHCOOR).(n=1 or 2,R=alkyl),are *** molecular structures are determined by analysis of yttrium content,infrared spectra and nuclear magnetic resonance spectra
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Measurement of Infinite Diluted Activity Coefficient of Solvents in Polymer by Inverse Gas Chromatography Method
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Chinese Journal of Chemical Engineering 2000年 第2期8卷 167-170页
作者: 冯媛媛 叶汝强 刘洪来 E China univ Sci & Technol Dept Chem Shanghai 200237 Peoples R China
The infinite diluted activity coefficients of solvents in polyisopropyl methylacrylate was measured using inverse gas chromatography. The solvents used were benzene, toluene, ethyl benzene, methyl acetate, ethyl aceta... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
1,3-Dipolar Cycloaddition Reaction between Vinyl Acetate and N-Alkyl Hydroxypyridinium Halide
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Chinese Chemical Letters 2001年 第12期12卷 1053-1054页
作者: Zhou, SF Su, JY Zeng, LM Zhongshan univ Sch Chem & Engn Guangzhou 510275 Peoples R China
1, 3 Dipolar cycloaddition reaction between vinyl acetate and 3-hydroxypyridiniun betaine was performed under solid-liquid phase transfer catalytic condition, This reaction has been successfully used on the synthesis ... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
A NEW HIGH ORDER SCHEME FOR CONVECTION EQUATION AND ITS APPLICATION
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Journal of Hydrodynamics 2002年 第1期14卷 81-86页
作者: Zhang Xiao-feng (Department of River Engineering, Wuhan university, Wuhan 430072, China) Zhang Hong-wu (Department of Hydraulic Engineering, Tsinghua university, Beijing 100084, China) Tamotsu Takahashi, Hajime Nakagawa (Disaster Prevention Research Dept. of River Eng. Wuhan Univ. Wuhan 430072 China
With the undetermined coefficient method, a new high order scheme for convection equation named as HAUC was worke d out. The accuracy of the new scheme was analyzed by comparing the computed res ults with the exact s... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论