检索结果-南通市图书馆

Science China Chemistry 2010年第5期53卷 1141-1147页

作者： SANG Qian,FENG Ying ,DONG XiuCai & ZHAO JiRuo Key Laboratory of Rubber-Plastics,Ministry of Education qingdao university of Science and Technology,qingdao 266042,China Key Laboratory of Rubber-Plastics Ministry of Education Qingdao University of Science and Technology Qingdao China

The radical polymerization of methyl methacrylate(MMA) was carried out in the presence of combined Lewis acids of the AlCl3-FeCl2 *** with the polymerization produced in the presence of single Lewis acids,AlCl3 or FeCl2,the MMA polymerization in the presence of AlCl3-FeCl2 composite in CHCl3 or 1-butanol produced a polymer with a higher isotacticity and in toluene produced a polymer with a much higher isotacticity(mm=50%) .The molecular weight and polydispersity of PMMA in the presence of Lewis acids were similar with those in the absence of Lewis acids,although Lewis acids decelerate the polymerization of *** effects of the Lewis acids were greater in a solvent with a lower polarity.A possible stereocontrol mechanism of the polymerization was *** Lewis acid composite of AlCl3-FeCl2 readily formed a complex with growing *** complexes possessed apparent bulkiness that changes the direction of monomer addition to the growing radical center.

关键词： MMA radical polymerization tacticity Lewis acid stereocontrol polymerization

A three-dimensional numerical calculation of the wind-driven thermohaline and tide-induced Lagrangian residual current in the Bohai Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 1993年第2期12卷 169-182页

作者： Wang Hui, Su Zhiqing, Feng Shizuo and Sun Wenxin Ocean university of qingdao, qingdao 266003, China

On the basis of a three-dimensional weakly nonliear theory of Lagrangian residual current in the Baroclinic shallow seas, a diagnostic numerical calculation of wind-driven, thermohaline and tide-induced Lagrangian residual current in the Bohai Sea is made. The model involves the Richardson number in the eddy viscosity coefficient, wind, thcrmolialine and tidal effects in the focing terms. The runoff of the Huanghe River and a part of the Huanghai Warm Water coming from the Huanghai Sea through the Bohai Sea Strait is also considered. The velocity-splitting method is adopted. The wind-driven circu lation, thermohaline circulation and the tide-induced Lagrangian residual circulation are also obtained individually and analysed. The dynamics of the three main eddies in the Lagrangian mean circulation is discussed. Finally, the numerical result is partly verified with the observed data.

关键词： A three-dimensional numerical calculation of the wind-driven thermohaline and tide-induced Lagrangian residual current in the Bohai Sea

Study on short-range numerical forecasting of ocean current in the East China Sea——Ⅰ Basic problems of ocean current forecasting and structure of the models

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 1993年第3期12卷 335-345页

作者： Zhao Jinping, Chen Zhongyong and Shi Maochong Institute of Oceanology, Academia Sinica, qingdao 266071, China Ocean university of qingdao, qingdao 266003, China

Ocean current forecasting is still in explorative stage of study. In the study, we face some problems that have not been met before. The solving of these problems has become fundamental premise for realizing the ocean current forecasting. In the present paper are discussed in depth the physical essence for such basic problems as the predictability of ocean current, the predictable currents, the dynamical basis for studying respectively the tidal current and circulation, the necessity of boundary model, the models on regions with different scales and their link. The foundations and plans to solve the problems are demonstrated. Finally a set of operational numerical forecasting system for ocean current is proposed.

关键词： Current forecasting ocean circulation operational numerical forecasting numerical model the East China Sea

在线全文

学校读者我要写书评

暂无评论

FOREWORD

中国海洋大学学报（自然科学版） 1989年第S1期27卷 3-4页

作者： Shi ZhengkengPresidentOcean university of qingdao

The concept of water mass was carried within the early development ofoceanography and the analysis of water mass has so far become one of theimportant subjects of physical oceanography. The formation and charactersof ocean water mass are described and discussed at length in many famousbooks and classical textbooks on physical oceanography, such as "The Oceans"

关键词： ocean length FOREWORD qingdao shallow Shandong Marine season regularity NSFC

Polypeptide from Chlamys farreri attenuates murine thymocytes damage induced by ultraviolet B

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2007年第10期28卷 1665-1670页

作者： Hai-ying CHEN~(2,3),Xiao CHU~4,Chun-ling YAN~5,Xue-hong CHEN~5,Mi SUN~6,Yue-jun WANG~6,Chun-bo WANG~(3,7),Wen-gong YU~(2,7)~2 Department of Pharmacochemistry,Ocean university of China,qingdao 266003,China ~3 Department of Pharmacology,Medical College,qingdaouniversity,qingdao 266021,China ~4 qingdao Municipal Hospital,qingdao 266010,China ~5 Department of Pathophysiology,MedicalCollege,qingdao university,qingdao 266021,China ~6 Yellow Sea Fishery Research Institute,qingdao 266071,China Department of Pharmacochemistry Ocean University of China Qingdao China Department of Pharmacology Medical College Qingdao University Qingdao China qingdao Municipal Hospital Qingdao China Department of Pathophysiology Medical College Qingdao University Qingdao China Yellow Sea Fishery Research Institute Qingdao China

Aim:Polypeptide from Chlamys farreri (PCF,molecular mass is 879) is a newmarine polypeptide compound isolated from Chlamys *** study investi-gates the possible protective roles and the mechanism of PCF against ultravioletB (UVB)-induced apoptosis in murine ***:The rate of apoptosisand caspase-3 activation was measured by flow *** expression ofstress-response genes c-fos and c-jun was observed by *** blotanalysis was performed to determine the release of cytochrome ***:It wasfound that UVB induced murine thymocyte *** cells treated with UVBshowed an increase in cytochrome c release,caspase-3 activity,as well as in theexpression of c-fos and *** addition,all were involved in UVB-induced ***:Our present observations pointed to the ability of PCF toavert UVB-induced apoptosis in thymocytes by modulating c-fos and c-junexpression,cytochrome c release,and the consequent activation of caspase-3,which were essential components of the UV-induced cell apoptotic *** suggested that PCF is a promising protective substance against UVradiation.

关键词： polypeptide from Chlamys farreri (PCF) ultraviolet B apoptosis cytochrome c caspase-3

Classification of (2, 2)-Stable Unfoldings of Map Germs with Codimensions (?) 4

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 1996年第4期12卷 415-432页

作者： Xiong Jianfei Institute of Applied Mathematics qingdao university, 266071 China Institute of Applied Mathematics Qingdao University China

In this paper we classify (2,2)-stable unfoldings of map germs with codimensions ≤4 by means of the algorithm given in [4] by Wassermann.

关键词： Classification of Stable Unfoldings of Map Germs with Codimensions Map

INTERNAL FLOW MECHANISM AND EXPERIMENTAL RESEARCH OF LOW PRESSURE AXIAL FAN WITH FORWARD-SKEWED BLADES

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2008年第3期20卷 299-305页

作者： LI Yang LIU Jie OUYANG Hua DU Zhao-Hui College of Electromechanical Engineering Qingdao University of Science and Technology Qingdao 266061China School of Environmental and Municipal Engineering Qingdao Technological University Qingdao 266033 China School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 China

This article presents the flow mechanism analysis and experimental study of a forward-skewed impeller and a radial impeller in low pressure axial fan. The forward-skewed blade was obtained by the optimization design of the radial blade and CFD technique. Measurement of the two blades was carried out in aerodynamic and aeroacoustic performance. Compared to the radial blade, the forward-skewed blade has demonstrated the improvements in efficiency, total pressure ratio, Stable Operating Range （SOR） and less aerodynamic noise. Detailed flow measurement and computation were performed for outlet flow field for investigating the responsible flow mechanisms. The results show the forward-skewed blade can cause a spanwise redistribution of flow toward the blade mid-span and reduce tip loading. This results in reduced significantly total pressure loss near hub and shroud endwall region, despite the slight increase of total pressure loss at mid-span.

关键词： low pressure axial fan forward-skewed blade aerodynamic performance flow mechanism

Application of sequency spectral method toocean and atmosphere data analysis

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2000年第4期19卷 47-52页

作者： Zhang Shuwen, Sun Fu, Tian Jiwei, Zhou Faxiu (Key Laboratory of Marine Science and Numerical Modelling, State Oceanic Administration, qingdao 266003 and qingdao university, qingdao 266071, China Marine Environmental College, Ocean university of qingdao, Q Key Lab. Marine Sci./Numerical State Oceanic Administration Qingdao University Qingdao 266071 China

The chaotic systems of average monthly air temperature of qingdao (SATQ) and the day SST of equatorial local area (DSSELA) are firstly studied by means of the sequency spectral method. It is shown that SATQ contains one-a period of predominant oscillation, two-a periods lower frepqency oscillation and 90-d, 63-d, 50-d, 40-d and 29-d lower frequency periods oscillation in DSSELA. Further more, the discrepancies between sequency spectrum and frequency spectrum are compared in this paper.

关键词： Sequency spectrum frequency spectrum ocean and atmosphere time series analysis

Nano Au/TiO_2 hollow microsphere membranes for the improved sensitivity of detecting specific DNA sequences related to transgenes in transgenic plants

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2008年第11期51卷 1066-1073页

作者： ZHANG YongChun, YANG Tao, ZHOU Na, ZHANG Wei & JIAO Kui College of Chemistry and Molecular Engineering, qingdao university of Science and Technology, qingdao 266042, China College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao China

Gold nanoparticles (nano Au)/titanium dioxide (TiO2) hollow microsphere membranes were prepared on the carbon paste electrode (CPE) for enhancing the sensitivity of DNA hybridization detection. The immobilization of nano Au and TiO2 microsphere was investigated with cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The hybridization events were monitored with EIS us-ing [Fe(CN)6]3-/4- as indicator. The sequence-specific DNA of the 35S promoter from cauliflower mosaic virus (CaMV35S) gene was detected with this DNA electrochemical sensor. The dynamic detection range was from 1.0×10-12 to 1.0×10-8 mol/L DNA and a detection limit of 2.3×10-13 mol/L could be ob-tained. The polymerase chain reaction (PCR) amplification of the terminator of nopaline synthase (NOS) gene from the real sample of a kind of transgenic soybean was also satisfactorily detected.

关键词： Au nanoparticle TiO_2 hollow microsphere DNA electrochemical biosensor CaMV35S gene NOS gene

Cross thermocline mixing effect due to tide in the shallow sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 1992年第1期11卷 1-11页

作者： Yang Dianrong, Zhou Dejian Zhang Yulin Institute of Physical Oceanography, Ocean university of qingdao, qingdao 266003, China

Using the data specially observed on the Bohai Sea oil platform by the authors for studying thermocline for two weeks, the thermocline depth, the temperature and the salinity of the layers below and above the thermocline were numerically modelled. The model is based on the Stigebrandt model and some important supplements are made in this paper in accordance with the local condition of the sea. The modelling results fit well in the observations. It is proved that the entrainmem due to both the tide and the wind can give rise to rather intense mixing cross the thermocline. This process makes the temperature rising below the thermocline,and causes the nutrient increasing above it,which has important significance for the marine physical environment and the marine organism.

关键词： shallow mixing salinity Bohai accordance intense nutrient numerically turbulent modelling