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HIGH ACCURACY FOR MIXES FINITE ELEMENT METHODS IN RAVIART-THOMAS ELEMENT

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Journal of Computational Mathematics 1996年第2期14卷 175-182页

作者： Lin, Q Pan, jh CHINESE ACAD SCI INST SYST SCIBEIJINGPEOPLES R CHINA UNIV PETR DEPT BASIC SCIBEIJINGPEOPLES R CHINA

This paper deals with Raviart-Thomas element (Q(2,1) x Q(1,2) - Q(1) element). Apart from its global superconvergence property of fourth order, we prove that a postprocessed extrapolation can globally increased the ac... 详细信息

关键词： Math Wang HIGH ACCURACY FOR MIXES FINITE ELEMENT METHODS IN RAVIART-THOMAS ELEMENT

A Linear Programming Model for Seabed Oil-Gas Pipe Network

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China Ocean Engineering 1998年第4期13卷 477-482页

作者： Li, HW Tan, jh Shanghai Jiao Tong Univ Sch Naval Architecture & Ocean Engn Shanghai 200030 Peoples R China

This paper analyzes the pipe network system of oil-gas collection and transportation for offshore oilfield development. A '0-1' integer linear programming model is constructed to optimize the investment of seabed pipe network. The mathematical model is solved by the spanning tree method of graph theory and network analysis. All spanning trees of a network graph compose all the feasible solutions of the mathematical model. The optimal solution of the model is the spanning tree with the minimum cost among all spanning trees. This method can be used to optimize the seabed pipe network system and give a minimum cost plan for the development of offshore marginal oilfield groups.

关键词： seabed pipe network offshore oilfield linear programming network analysis

The silt stalactite——a peculiar kind of sedimentary structures

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Chinese Science Bulletin 1997年第23期42卷 1974-1977,2025页

作者： Zhong, jh Ma, ZP Univ Petr China Dongying 257062 Peoples R China

THE Yellow River, with its huge amount of silt charge from the Loess Plateau, is the secondlargest river in China. Its lower reach has become a famous hanging river because of serioussilting up, and the magnitude of discharge changes much from season to season. As a result ofsilting, migration of the stream channel happens frequently. Lateral erosion of channel or pointbars, and scarp slopes forming during the erosion may be often observed. The silt stalactite,hitherto not reported, usually forms on surfaces of the slope. As a newly found kind of sedirnen-tary structure, the silt stalactite may have some significance to the study of sedimentary envi-ronments and paleoclimate.

关键词： silt stalactite sedimentary structure the Yellow River Delta.

EFFECT　OF　TRANSITION　METAL　Ni　ON　WELDING　PROPERTIES　OF　TITANIUM　ALLOY　STAINLESS　STEEL

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中国有色金属学会会刊：英文版 1997年第1期7卷 71-75页

作者： Sun, RL Meng, XC Zhang, jh HARBIN INST TECHNOL SCH MAT SCI & ENGNHARBIN 150001PEOPLES R CHINA

ＥＦＦＥＣＴＯＦＴＲＡＮＳＩＴＩＯＮＭＥＴＡＬＮｉＯＮＷＥＬＤＩＮＧＰＲＯＰＥＲＴＩＥＳＯＦＴＩＴＡＮＩＵＭＡＬＬＯＹＳＴＡＩＮＬＥＳＳＳＴＥＥＬ①ＳｕｎＲｏｎｇｌｕ，ＭｅｎｇＸｉａｎｇｃａｉＳｅｃｏｎｄＤｅｐａｒｔ... 详细信息

ＥＦＦＥＣＴＯＦＴＲＡＮＳＩＴＩＯＮＭＥＴＡＬＮｉＯＮＷＥＬＤＩＮＧＰＲＯＰＥＲＴＩＥＳＯＦＴＩＴＡＮＩＵＭＡＬＬＯＹＳＴＡＩＮＬＥＳＳＳＴＥＥＬ①ＳｕｎＲｏｎｇｌｕ，ＭｅｎｇＸｉａｎｇｃａｉＳｅｃｏｎｄＤｅｐａｒｔｍｅｎｔ，ＪｉａｍｕｓｉＩｎｓｔｉ...

关键词： Ti alloy stainless steel transition metal Ni diffusion welding

Conditions for origin to be a center and the bifurcation of limit cycles in a class of cubic systems

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Chinese Science Bulletin 1997年第14期42卷 1157-1161页

作者： Zhu, jh Zhu, SM Department of Mathematics Zhongshan University Guangzhou China

FOR a class of differential systems of center and focus

关键词： center fine focus focal value limit cycle symbolic computation.

Investigation of the Surface State of Zeolite HZSM-5 Pretreated with Toluene by Using Fast Atom Bombardment Mass Spectrometry (FABMS)

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Chinese Chemical Letters 1998年第7期9卷 671-674页

作者： Zhu, jh Xu, QH Nanjing Univ Dept Chem Nanjing 210093 Peoples R China

Toluene pretreatment caused many activated toluene species existing on the surface of zeolite HZSM-5, by which the activity of sample was increased. Moreover, variation in the surface Si+/Al+ ratio of HZSM-5 was sensi... 详细信息

关键词： zeolite HZSM-5 surface state FABMS toluene ethylation

SYNTHESIS AND CHARACTERIZATION OF HETEROBIMETALLIC COMPLEXES:(Cp_2LnOCH_2C_6H_5)Cr(CO)_3(Ln=Gd,Dy,Yb,Y)

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Chinese Chemical Letters 1995年第3期6卷 261-262页

作者： Qian, CT Guo, jh Acad Sinica Shanghai Inst Organ Chem Organomet Chem Lab Shanghai 200032 Peoples R China

Heterobimetallic complexes in which chromium and lanthanide metals were bridged with difunctional benzyloxide group (Cp2LnOCH2C6H5)Cr(CO)3 (Ln=Gd. Dy. Yb. Y). were synthesized The complexes were characterized by eleme... 详细信息

关键词： Dy AND SYNTHESIS CHARACTERIZATION HETEROBIMETALLIC OF Gd COMPLEXES Yb Cr

Non-invasive prediction of oesophageal varices in cirrhosis

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World Journal of Gastroenterology 2008年第15期14卷 2454-2455页

作者： Sambit Sen William jh Griffiths Department of Hepatology Cambridge University Hospitals NHS Foundation Trust Cambridge CB2 0QQ United Kingdom

Non-invasive predictors of varices in cirrhosis would reduce the need for screening endoscopies. Platelet count and spleen size have been shown to be useful parameters, in mixed groups of cirrhotics with different aetiologies. We evaluated this in two homogeneous groups with cirrhosis due to hepatitis C and alcohol. Non-invasive predictors appear promising in the former group, but less so in the latter group.

关键词： Varices Cirrhosis Endoscopy Platelet Spleen

The　Electrochemistry　of　Cytochrome　c　at　a　Viologen-thiol　Self-Assembled　Monolayer

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Chemical Research in Chinese Universities 1998年第1期14卷 17-24页

作者： Li, jh Cheng, GJ Dong, SJ Chinese Acad Sci Changchun Inst Appl Chem Electroanalyt Chem Lab Changchun 130022 Peoples R China

ＴｈｅＥｌｅｃｔｒｏｃｈｅｍｉｓｔｒｙｏｆＣｙｔｏｃｈｒｏｍｅｃａｔａＶｉｏｌｏｇｅｎ－ｔｈｉｏｌＳｅｌｆ－ＡｓｓｅｍｂｌｅｄＭｏｎｏｌａｙｅｒＬＩＪｉｎｇ－ｈｏｎｇ，ＣＨＥＮＧＧｕａｎｇ－ｊｉｎ，ＤＯＮＧＳｈａｏ－... 详细信息

ＴｈｅＥｌｅｃｔｒｏｃｈｅｍｉｓｔｒｙｏｆＣｙｔｏｃｈｒｏｍｅｃａｔａＶｉｏｌｏｇｅｎ－ｔｈｉｏｌＳｅｌｆ－ＡｓｓｅｍｂｌｅｄＭｏｎｏｌａｙｅｒＬＩＪｉｎｇ－ｈｏｎｇ，ＣＨＥＮＧＧｕａｎｇ－ｊｉｎ，ＤＯＮＧＳｈａｏ－ｊｕｎ（ＬａｂｏｒａｔｏｒｙｏｆＥ...

关键词： at Viologen-thiol Monolayer Self-Assembled The Cytochrome Electrochemistry