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Aseismic Reliability Analysis Approach for Offshore Jacket Platform Structures

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China Ocean Engineering 1998年第4期13卷 375-382页

作者： Zhuang, YZ Jin, wl Zhejiang Univ Dept Civil Engn Hangzhou 310027 Peoples R China

By means of nonlinear pushover collapse analysis approach, the aseismic reliability analyses of two offshore jacket platforms in the Bohai Gulf in China are studied according to their ocean location and environmental loadings there. On the basis of those analyses, an aseismic reliability analysis approach is presented. The results show that the aseismic reliability of those platforms is high. Also it is proved that this aseismic reliability analysis approach is simple, practical and reliable.

关键词： offshore jacket platform aseismic reliability nonlinear pushover collapse analysis

SYNTHESIS AND PROPERTIES OF SOME NEW POLYIMIDES CONTAINIng BITHIAZOLE RIngS

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Chinese Chemical Letters 1996年第4期7卷 313-316页

作者： Sun, wl Lu, FC ACAD SINICA INST CHEMBEIJING 100080PEOPLES R CHINA

Some new polyimides containing bithiazole rings were prepared by reacting 2,2'-diamino-4,4'-bisthiazole with different aromatic dianhydrides. The polyimides obtained had inherent viscosities of 0.37-0.82 dL/g. Thermogravimetric analysis of the polyimides showed good thermal stability, the temperature at 5% weight loss being from 450 degrees C to 560 degrees C. The permeability of two polymer membranes to H-2, O-2 and N-2 was determined.

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Nucleation and Oriented Textured Growth of Diamond Films on Si(100) via Electron Emission in Hot Filament Chemical Vapor Deposition

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Journal of Materials Science & Technology 2000年第1期16卷 19-22页

作者： Wang, wl Liao, KJ Wang, BB Chongqing Univ Dept Appl Phys Chongqing 400044 Peoples R China

Oriented textured diamond films were obtained on Si(100) substrate via electron emission in hot filament chemical vapor deposition (HFCVD). A de bias voltage relative to the filament was applied to the tungsten electrode between the substrate and the filament. The nucleation and subsequent growth of diamond films were characterized by scanning electron microscopy and Raman spectroscopy. The experimental results showed that the electron emission from the diamond coating on the electrode played a critical role during the nucleation. The maximum value of nucleation density was up to 10(11) cm(-2) on pristine Si surface at emission current of 250 mA. The effect of the electron emission on the reactive gas composition was analyzed by in situ infrared absorption, indicating that the concentration of CH3 and C2H2 near the substrate surface was extremely increased. This may be responsible for the enhanced nucleation by electron emission.

关键词： Diamond films

Solid and liquid phase equilibria in mixtures of N, N-dimethylacetamide with chlorinated hydrocarbons

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Chinese Science Bulletin 1997年第11期42卷 918-921页

作者： Che, GQ Peng, wl Che, B Department of Chemistry Zhongshan University Guangzhou China

IN refs.[1,2],we studied the solid and liquid phase equilibria in mixtures of tetra-chloromethane with oxygen and nitrogen-containing compounds,intermolecular interactionswith the formation of solid molecular addition... 详细信息

关键词： phase diagram solid and liquid equilibrium N N-dimethylacetamide.

A New Triterpenoid Glycoside from Dichotomanthes tristaniaecarpa

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Chinese Chemical Letters 2000年第11期11卷 1013-1014页

作者： Mei, wl Luo, XD Chen, CX Acad Sinica Kunming Inst Bot Lab Phytochem Kunming 650204 Peoples R China

A new triterpenoid glycoside 1, 1 beta, 2 alpha, 3 alpha, 19 alpha -tetrahydroxyurs-12-en-28-oic acid beta -D glucopyranosyl ester was isolated from Dichotomanthes tristaniaecarpa. The structure was elucidated on the ... 详细信息

关键词： triterpenoid glucoside Dichotomanthes tristaniaecarp Rosaceae

Ab initio molecular orbital study of structure on aluminium borides AlB_n (n = 1- 5) series

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Chinese Science Bulletin 1997年第11期42卷 907-910页

作者： Wu, HS Xu, XH Zhou, wl Department of Chemistry Shanxi Normal University Linfen 041004 China

RECENTLY,great attention has been paid to the physical and chemical properties of atomic andsemiconductor *** the properties of AlB_n atomic cluster,experimental studieshave been reported,yet theoretical studies have not been *** borides(AlB_n)have been widely used to change the fiber strength in mechanical engineering and to adjust

关键词： aluminium boride ab initio molecular orbital binding energy.

Synthesis of Chitosan Quaternary Ammonium Salts

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Chinese Chemical Letters 2001年第12期12卷 1081-1084页

作者： Xu, wl Wu, J Fu, CL Zhejiang Univ Dept Chem Hua Jia Chi Sect Hangzhou 310029 Peoples R China

A series of N-alkyl or N-aryl chitosan quaternary ammonium salts were prepared via Schiffs base intermediates. Quaternization of N-substituted chitosan derivatives was carried out using methyl iodide to produce water-soluble cationic chitosan quaternary ammonium salt. The products were characterized by IR, (HNMR)-H-1 and elemental analysis. The degree of substitution of chitosan quaternary ammonium salt was calculated by elemental analysis.

关键词： synthesis quaternization chitosan quaternary ammonium salts

Expression of gap junction genes connexin 32,connexin 43 and their proteins in hepatocellular carcinoma and normal liver tissues

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World Journal of Gastroenterology 2000年第1期6卷 66-69页

作者： Ma XD Sui YF Wang wl Department of Pathology the Fourth Military Medical University17 Changle XiluXi'an 710033Shaanxi ProvinceChina

AIM To investigate the significance andmechanism of cx32 mRNA,cx43 mRNA and theirproteins in *** Sixty-one cases of HCC and 14cases of normal liver tissues were detected byimmunohistochemical and in situ hybridization(ISH)*** In HCC grades Ⅰ,Ⅱ,Ⅲ and normalliver tissues,the positive rates of Cx32 proteinwere 55.6%,42.1%,18.2% and 92.9%,*** detection rates of Cx43 proteinwere 44.4%,26.3%,12.1% and 78.6%,*** was significant difference inCx32 and Cx43 protein between HCC and normalliver tissues(P0.05).CONCLUSION The aberrant location of Cx32and Cx43 proteins could be responsible forprogression of hepatocarcinogenesis,and thedefect of cx genes in post-translationalprocessing might be the possible mechanism.

关键词： Subject headings connexin gap junction liver neoplasm immunohistochemistry in situ hybridization carcinoma hepatocellular gene expression

Design and Site Experiment of Groyne in Bore Surging Area of Qiantang River

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China Ocean Engineering 1997年第4期12卷 467-476页

作者： Xuan, wl Xu, XJ Zhao, YQ Bur Qiantang River Zhejiang Prov Adm Hangzhou 310016 Peoples R China Zhejiang Univ Dept Civil Engn Hangzhou 310027 Peoples R China

The groyne has been used widely in bank protection and river regulation. The plane layout and structural style of groyne are closely related to the stability of the groyne itself and the effect of bank protection. In this paper, based on the preliminary summary of the design of bank protection in the bore surging area of Qiantang River, some problems regarding the structure of groyne are pointed out and an improved plan is put forward. Site experiment was carried out combined with an emergency repair. The results of the experiment indicate that the improved project is reliable and successful.

关键词： Qiantang River groyne bank protection bore area site experiment