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Journal of Materials Science & Technology 1996年第5期12卷 347-352页

作者： Sun, DQ Zhou, ZF Cao, hc JILIN UNIV TECHNOL DEPT MAT SCI ENGNCHANGCHUN 130022PEOPLES R CHINA

Effect of Si, Al and Bi on the microstructure and mechanical properties of as-welded and austempered ductile iron weld metals has been studied with SEM, TEM, X-ray diffraction, image analysing system, tension and other test methods. Results show that increasing weld Si, Al and Bi content favours improving the chilling tendency of as-welded ductile iron weld and mechanical properties of austempered ductile iron weld and the mechanism is also discussed. On this basis the optimum chemical composition of weld is determined. The mechanical properties of weld and welded joint after austempering can match those of austempered ductile iron.

关键词： Filler metals

QUADRILATERAL FINITE ELEMENTS FOR PLANAR LINEAR ELASTICITY PROBLEM WITH LARGE LAME CONSTANT

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Journal of Computational Mathematics 1998年第4期16卷 357-366页

作者： Cheng, XL Huang, hc Zou, J Hangzhou Univ Dept Math Hangzhou Peoples R China Hong Kong Baptist Univ Dept Math Hong Kong Hong Kong Chinese Univ Hong Kong Dept Math Hong Kong Hong Kong

In this paper, we discuss the quadrilateral, finite element approximation to the two-dimensional linear elasticity problem associated with a homogeneous isotropic elastic material. The optimal convergence of the finite element method is proved for both the L-2-norm and energy-norm, and in particular, the convergence is uniform with respect to the Lame constant lambda. Also the performance of the scheme does not deteriorate as the material becomes nearly incompressible, Numerical experiments are given which are consistent with our theory.

关键词： planar linear elasticity optimal error estimates large Lame constant locking phenomenon

Two New Isopimarane Diterpenes from theRoots of Acorus Tatarinowii Schott

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Chinese Chemical Letters 1997年第1期8卷 37-38页

作者： Wang, MF Lao, AN Wang, hc CHINESE ACAD SCI SHANGHAI INST MAT MED SHANGHAI 200031 PEOPLES R CHINA NIHON UNIV COLL PHARM FUNABASHI CHIBA 274 JAPAN

Two new isoprimarane diterpenes, tatarol (1) and tataroside (2) were isolated from the roots of Acorus tatarinowii Schott. Their structures were identified by spectral methods.

关键词： Two New Isopimarane Diterpenes from theRoots of Acorus Tatarinowii Schott

Two New Amides from the Roots of Acorus Tatarinowii Schott

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Chinese Chemical Letters 1997年第1期8卷 35-36页

作者： Wang, MF Lao, AN Wang, hc ACAD SINICA SHANGHAI INST MAT MEDSHANGHAI 200031PEOPLES R CHINA

Two new amides, tataramide A (1) and tataramide B (2), were isolated from the roots of Acorus tatarinowii Schott. Their structures were determined by spectroscopic methods.

关键词： Two New Amides from the Roots of Acorus Tatarinowii Schott

A Numerical Model for Typhoon Surges

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China Ocean Engineering 1998年第2期13卷 191-202页

作者： Pan, JN Wang, hc Yao, GQ Nanjing Hydraul Res Inst River Harbour Dept Nanjing 210024 Peoples R China

In this paper a simple and efficient implicit finite-difference scheme is used for depth-averaged two-dimensional storm surge model. This finite-difference scheme is simpler and more efficient than the widely-used ADI scheme. Accuracy analysis and stability analysis indicate that the scheme has two-order accuracy and is unconditionally stable when the grid size is constant. The present analysis results show that the scheme is of higher numerical accuracy than that introduced by Maa (1990). After tested by ideal models, a calculation example of a real typhoon surge is carried out, the results of the numerical simulation coincide well with the observed data and the accuracy is sufficient for engineering applications.

关键词： storm surge numerical simulation finite-difference scheme accuracy stability

Synthesis　and　Characterization　of　Tri(organotin)Substituted　Heteropolytungstates

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Chemical Research in Chinese Universities 1998年第1期14卷 6-11页

作者： Yang, QH Dai, hc Liu, JF NE Normal Univ Dept Chem Changchun 130024 Peoples R China

ＳｙｎｔｈｅｓｉｓａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＴｒｉ（ｏｒｇａｎｏｔｉｎ）ＳｕｂｓｔｉｔｕｔｅｄＨｅｔｅｒｏｐｏｌｙｔｕｎｇｓｔａｔｅｓＹＡＮＧＱｉ－ｈｕａ，ＤＡＩＨｕｉ－ｃｏｎｇ，ＬＩＵＪｉｎｇ－ｆｕ... 详细信息

ＳｙｎｔｈｅｓｉｓａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＴｒｉ（ｏｒｇａｎｏｔｉｎ）ＳｕｂｓｔｉｔｕｔｅｄＨｅｔｅｒｏｐｏｌｙｔｕｎｇｓｔａｔｅｓＹＡＮＧＱｉ－ｈｕａ，ＤＡＩＨｕｉ－ｃｏｎｇ，ＬＩＵＪｉｎｇ－ｆｕ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍ...

关键词： organotin)Substituted Heteropolytungstates Synthesis Tri Characterization

Dynamic Behaviour of a Caisson Quaywall Under Strong Earthquake

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China Ocean Engineering 1999年第1期14卷 47-62页

作者： Liu, HL Dai, hc Iai, S Hohai Univ Geotech Engn Res Inst Nanjing 210098 Peoples R China China Yangtze Three Gorges Project Dev Corp Yichang 443002 Peoples R China Minist Transport Port & Harbour Res Inst Nagase 239 Japan

Effective stress analysis is performed to evaluate the residual displacement of a caisson quaywall during 1994 Hokkaido- Toho- Oki Earthquake and 1993 Kushiro- Oki Earthquake. The constitutive model used in this study is a multiple shear mechanism type defined in strain space and can take into account the effect of rotation of principal stress axis. The earthquake accelerations recorded at the outcropping rock during the earthquake are used as input bedrock motion. The results of finite element analysis are in good agreement with the observed behaviour of the quaywall. The analysis also indicates that liquefaction and high excess porewater pressure have a significant effect on the deformation of the caisson. Soil improvement is speculated as the most reliable measures against liquefaction. The influence of soil improvement and the reasonable improved area are discussed in the paper.

关键词： caisson quaywall effective stress analysis lique faction residual deformation

Design of Hybrid Composites with Zero Coefficient of Thermal Expansion

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Journal of Materials Science & Technology 1996年第4期12卷 241-248页

作者： Zhang, ZG Zhong, WH Song, hc BEIJING UNIV AERONAUT & ASTRONAUT DEPT MAT SCI & ENGNBEIJING 100083PEOPLES R CHINA

Structures used in aerospace are influenced by temperature. So coefficient-of thermal expansion (CTE) is not only an important parameter of materials, but also a significant parameter of structural design of spacecrafts with high dimensional stability. In this paper, based on the analysis of the data from tests, theoretical formulae for predicting CTE and mechanical properties of hybrid composites are presented, and the calculation program is compiled. All the equations are verified by experiments. Optimization is conducted by computer. The results and methods presented in this paper can be used both in optimal design of hybrid composites with zero CTE and in design of hybrid composites with any certain CTE value.

关键词： Design of Hybrid Composites with Zero Coefficient of Thermal Expansion CTE

IN-SITU OBSERVATION OF FATIGUE CRACK GROWTH IN CENTRIFUGAL SPRAY DEPOSITION (CSD)Ti-48Al-2Mn-2Nb ALLOY

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中国有色金属学会会刊：英文版 1998年第4期8卷 82-85页

作者： Song, XP Cai, HP Chen, WZ Gu, hc Xian Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China Fuzhou Univ Dept Mat Fuzhou 350002 Peoples R China

ＩＮＴＲＯＤＵＣＴＩＯＮＴｉＡｌｉｎｔｅｒｍｅｔａｌｉｃｃｏｍｐｏｕｎｄｓａｒｅｃｕｒｅｎｔｌｙｓｅｅｎａｓｃａｎｄｉｄａｔｅｍａｔｅｒｉａｌｓｆｏｒｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｓｔｒｕｃｔｕｒａｌａｐｐｌｉｃａｔ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＴｉＡｌｉｎｔｅｒｍｅｔａｌｉｃｃｏｍｐｏｕｎｄｓａｒｅｃｕｒｅｎｔｌｙｓｅｅｎａｓｃａｎｄｉｄａｔｅｍａｔｅｒｉａｌｓｆｏｒｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｓｔｒｕｃｔｕｒａｌａｐｐｌｉｃａｔｉｏｎｉｎａｅｒｏｎａｕｔｉｃａｌ...

关键词： centrifugal spray deposition (CSD) Ti 48Al 2Mn 2Nb alloy fatigue crack

Electrochemical Studies of Effect of Eu^(3+) on Adenosine-5′-Diphosphate at Mercury Electrode

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Journal of Rare Earths 1999年第2期17卷 76-78页

作者： Liu, H Zhuang, QK Ye, XZ Dai, hc Peking Univ Dept Chem Beijing 100871 Peoples R China

The electrochemical behavior of the adenosine5diphosphate(ADP) was studied in 005 molL-1 MES buffer solution(pH 585) at mercury electrode. There are no reduction and oxidation waves for the adenosine5diphosphate in the range of -04-14 V(vs. Ag/AgCl). In a mixture solution of Eu3+ and ADP(Eu3+ADP=14), a reduction peak is obtained at -078 V. Comparing with the cyclic voltammograms of Eu3+ ions under the same experimental conditions, it is found that the complex of Eu3+ADP can be produced in above solutions between Eu3+ion and ADP. The complex is strongly adsorbed at mercury electrode and has the following electrode reaction mechanism: Eu3++ADPEu3+ADP+e-Eu2+-ADP.

关键词： Rare earths Europium Adenosine5diphosphate Electrochemistry