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Pyrohyperforin, A New Prenylated Phloroglucinol from Hypericum perforatum

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Chinese Chemical Letters 2000年第8期11卷 701-704页

作者： Shan, MD Hu, lh Chen, ZL Chinese Acad Sci Shanghai Inst Mat Med Shanghai 200031 Peoples R China

Pyrohyperforin, a new prenylated phloroglucinol was isolated from Hypericum perforatum, its structure was established on the basis of spectral data.

关键词： Hypericum perforatum new prenylated phloroglucinol pyrohyperforin

DIFFUSION WELDING FOR 6061 Al REINFORCED WITH SiCw WHISKER

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Journal of Wuhan University of Technology(Materials Science) 1999年第1期14卷 1-5页

作者： Niu, JT Liu, LM Han, lh Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The weldability of SiCw/6061Al -was investigated. From the results of experiments, it is found that the strength of joint is mainly influenced by welding temperature, and high strength of joint is obtained under melding temperature between liquidus and solidus of matrix alloy. Diffusion welding of SiCw/6061Al was successfully realized with appropriate ivelding parameters.

关键词： SiCw/6061Al composite diffusion welding welding temperature

Molecular Weight Characterization of Partially Hydrolyzed Polyacrylamide in the Complex Salts Solution

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Chinese Chemical Letters 1997年第1期8卷 73-74页

作者： Ye, ML Han, D Shi, lh ACAD SINICA INST CHEMPOLYMER PHYS LABBEIJING 100080PEOPLES R CHINA

The effects of the nature of salts, salt concentration, pH value, degree of hydrolysis as well as surfactant on molecular size of HPAM were studied. It is found that [eta] of HPAM changes with all the above variables, and the molecular weight of HPAM can be obtained through [eta] measurement at a specific salts environment in which the [eta] is independent of above factors.

关键词： Molecular Weight Characterization of Partially Hydrolyzed Polyacrylamide in the Complex Salts Solution

A new type numerical model for action balance equation in simulating nearshore waves

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Chinese Science Bulletin 2001年第11期46卷 963-968页

作者： Yan, YX Xu, FM Mao, lh Hohai Univ Res Inst Coastal & Ocean Engn Nanjing 210098 Peoples R China

Several current used wave numerical models are briefly described, the computing techniques of the source terms, numerical wave generation and boundary conditions in the action balance equation model are discussed. Not only the quadruplet wave-wave interactions, but also the triad wave-wave interactions are included in the model, so that nearshore waves could be simulated reasonably. The model is compared with the Boussinesq equation and the mild slope equation. The model is applied to calculating the distributions of wave height and wave period field in the Haian Bay area and to simulating the influences of the unsteady current and water level variation on the wave field. Finally, the developing tendency of the model is discussed.

关键词： action balance equation numerical generating waves quadruplet wave-wave interactions triad wave-wave interactions Boussinesq equation mild slope equation.

Experimental Study of Wave Pressure on a Breakwater Pier

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China Ocean Engineering 1999年第2期14卷 209-216页

作者： Pan, SH Xia, QY Lin, SQ Xu, lh Hohai Univ Coll Harbour Waterway & Coastal Engn Dept Coastal Engn Nanjing 210098 Peoples R China Fujian Prov Ports & Shipping Adm Bur Fuzhou 350009 Peoples R China

Test studies on the wave pressure on a breakwater pier show that the influence of transmissive wave pressure on the outside wall of the breakwater pier is considerable, when the width of the pier is not very large. The variations of transmissive wave pressure on the breakwater pier with different widths are compared and the relationship is obtained between relative transmitting distance b/L and wave pressure reduction factor K, which may be used in the design of similar breakwater piers.

关键词： wave pressure breakwater pier

O－（1－BENZOTRIAZOLYL）－SULFATE　AS　ALEAVING　GROUP　IN　SUBSTITUTION　OF　NUCLEOSIDE

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Chinese Chemical Letters 1995年第7期6卷 549-552页

作者： Zhang, YS Wang, LX Zhang, lh Beijing Med Univ Sch Pharmaceut Sci Beijing 100083 Peoples R China Tainjin Med Univ Dept Pharm Tianjin 300070 Peoples R China

Amino adenosines were synthesized by substitution of 5'-O-(1-benzoiriazolyl)-sulfonyl adenosine with various amines in very good yields.

关键词： AS SULFATE GROUP SUBSTITUTION BENZOTRIAZOLYL ALEAVING

STUDIES ON THE SYNTHESIS OF NOVEL ISONUCLEOSIDE FROM D-GLUCOSE

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Chinese Chemical Letters 1995年第8期6卷 655-656页

作者： Yu, HW Ma, LT Zhang, lh Beijing Med Univ Sch Pharmaceut Sci Beijing 100083 Peoples R China

A novel isonucleoside, 2,5-anhydro-4-(adenine-9-yl-)-L-iditol was synthesized from D-glucose through 9 steps.

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Short term effect of Salvia miltiorrhiza in treating rat acetic acid chronic gastric ulcer and long term effect in preventing recurrence

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World Journal of Gastroenterology 1998年第2期4卷 77-78页

作者： Wang, GZ Ru, X Ding, lh Li, HQ First Affiliated Hosp Qiqihaer Med Coll Dept Pathophysiol Qiqihaer 161042 Heilongjiang Peoples R China First Affiliated Hosp Qiqihaer Med Coll Dept Surg Qiqihaer 161042 Heilongjiang Peoples R China China Med Univ Dept Pathophysiol Shenyang 110001 Liaoning Peoples R China

AIM To study the short term effect of Danshen ( Salvia miltiorrhiza ) on acetic acid induced chronic gastric ulcer in rats and its long term effect in preventing recurrence. METHODS Rats with acetic acid induced gastric ulcer were treated with Danshen and cimetidine for 30 days. Traditional gastric mucosal auto radiography and 3H TdR incorporation into gastric mucosa in vitro were employed to study the effects of Danshen in rat acetic acid induced chronic gastric ulcer, including ulcer index (UI), ulcer inhibitory rate (IR) and label rate (LR). RESULTS On the day 5, 30 and 126 of ulcer making, the UI in the Danshen group was obviously lower than that in the cimetidine group and the control group (42 3±3 9, 3 6±1 2, 4 4±2 3; 49 1±3 6, 5 9±1 4, 9 2±1 3; 61 0±3 8, 8 9±2 5, 12 4±2 4, respectively, P ration along the edge of the ulcer.

关键词： Danshen disease models, animal Salvia miltiorrhiza stomach ulcer acetic acid cimitidine gastric mucosa recurrence rats , Wistar chronic diseases

Application of Nanopowder to High Temperature Single Crystal Fiber Sensor

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Journal of Materials Science & Technology 1997年第4期13卷 364-366页

作者： Wang, YQ Wu, XJ Ye, lh Tong, LM Shen, YH ZHEJIANG UNIV DEPT PHYSHANGZHOU 310027PEOPLES R CHINA

ZrO2, CuO, Al2O3 and SiO2 mixed nanopowder was used to coat the head of sapphire single crystal fiber for improving the properties of high-temperature single crystal fiber sensor. The result indicates that the head coated with above mixed nanopowder shows better optical stability, shorter response time and higher thermal shock resistance, in comparison with the head coated with coarse-grained particles with the same chemical compositions.

关键词： Nanostructured materials