检索结果-南通市图书馆

Acta Oceanologica Sinica 2003年第4期22卷 491-502页

作者： Xu Jianping 1,2.Chai Fei 2.3,Liu Zenghong 1,2.Zhu Bokang 1,2.1.Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012.china. 2.Key Laboratory of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration, Hangzhou 310012. china 3.{2. of Marine Science, university of Maine, Orono, ME 04469-5741,USA Second Institute of Oceanography State Oceanic Administration Hangzhou 310012 China Key Lab. of Ocean Dynamic Processes Hangzhou 310012 China school of Marine Science University of Maine Orono ME 04469-5741 United States

dOn the basis of the CTD data obtained by the two cruises before and after summer monsoon burst (2.th May, 1998), several significant hydrographic characteristics, their variation and formation mechanism in the South china Sea (SCS) are analyzed. The results show that the Kuroshio water intrudes into the SCS in the form of loop current, and its main part is limited to the east of 118degreesE near the Luzon Strait. Then it continuously extends westwards under the influence of the large-scale circulation, and has a distinct impact on the area north of 16degreesN. There are two high temperature and low salinity regions: west off Luzon and east off Vietnam respectively. One region west off Luzon strengthens obviously after summer monsoon burst, the other east off Vietnam shows a tendency of weakening in the north and strengthening in the south. The formation of these two high temperature and low salinity regions is related to the anti-cyclonic eddies existing in this area, besides, it is also related to the high temperature feature west of Luzon, the influx of Sulu Sea water and the influence of the large-scale air circulation. There is a cold region below the depth of 50 m in the south of Zhongsha Islands, and it strengthens after monsoon burst. The formation of cold water is related to the upwelling there.

关键词： monsoon burst hydrographic characteristics Kuroshio Luzon Strait South china Sea

Sol-gel preparation and spectroscopic study of the pyrophanite MnTiO_3 nanoparticles

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2005年第3期48卷 210-215页

作者： ZHOU Guowei1, KANG Youngsoo2. LI Tianduo1 & XU Guiying3 1. school of Light Chemicals and Environmental Engineering, Shandong Institute of Light Industry, Jinan 2.0100, china 2. Department of Chemistry, Pukyong National {2., Daeyeon-3-dong, Nam-gu, Pusan 608-737, Korea 3. Key Laboratory for Colloid and Interface of Ministry of Education of china, Shandong {2., Jinan 2.0100, china school of Light Chemicals and Environmental Engineering Shandong Institute of Light Industry Jinan China Department of Chemistry Pukyong National University Pusan Korea Key Laboratory for Colloid and Interface of Ministry of Education of china Shandong University Jinan China

The nanosized xerogel of titanium dioxide (TiO2. and manganese oxides (MnO2. Mn2.3, Mn3O4) was prepared by the sol-gel method using manganese chloride (MnCl2.4H2.) and titanium isopropoxide (Ti(O-iPr)4) as precursors in cetyltrimethylammonium bromide (CTAB)/ ethanol/H2./HCl micelle solutions, following the calcinations of the produced powders at differ-ence temperatures. The nanostructure and phase composition of these nanoparticles were characterized with X-ray powder diffraction (XRD), transmission electron microscopy (TEM), en-ergy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). The spectroscopic characterizations of these nanoparticles were also done with UV-Vis spectroscopy and laser Raman spectroscopy (LRS). XRD patterns show that the pyrophanite MnTiO3 phase was formed at the calcinations temperature of 900℃. The TEM images show that the nanoparti-cles are almost spherical or slight ellipose and the sizes are 50 nm on average. The UV-Vis spectra show that the nanosized MnTiO3 have significant absorption bands in the visible region. There are new absorption peaks of MnTiO3 nanoparticles in LRS compared with the pure TiO2.powder.

关键词： pyrophanite MnTiO3, nanoparticles, spectroscopy, CTAB micelle, sol-gel.

Analytical criteria for local activity of CNN with five state variables and application to Hyper-chaos synchronization Chua's circuit

在线全文

学校读者我要写书评

暂无评论

Journal of university of Science and technology Beijing 2002年第4期9卷 311-318页

作者： Lequan Min and Xisong DongApplied Science school, university of Science and {2. Beijing, Beijing 100083, china Univ Sci & Technol Beijing Appl Sci Sch Beijing 100083 Peoples R China

The analytic criteria for the local activity theory in one-port cellularneural network (CNN) with five local state variables are presented. The application to a Hyper-chaossynchronization Chua's circuit (HCSCC) CNN with 112. variables is studied. The bifurcation diagramsof the HCSCC CNN show that they are slightly different from the smoothed CNN with one or two portsand four state variables calculated earlier. The evolution of the patterns of the state variables ofthe HCSCC CNN is stimulated. Oscillatory patterns, chaotic patterns, convergent or divergentpatterns may emerge if the selected cell parameters are located in the locally active domains butnearby or in the edge of chaos domain.

关键词： cellular neural network local activity Hyper-Chaos Synchronization Chua's circuit five state variables chaos

Effect of Dachengqi Decoction on NF-κB p65 Expression in Lung of Rats with Partial Intestinal Obstruction and the Underlying Mechanism

在线全文

学校读者我要写书评

暂无评论

Journal of Huazhong university of Science and technology(Medical Sciences) 2010年第2期30卷 217-221页

作者：杨胜兰沈霖金阳刘建国高洁嫦李道本 Department of Traditional Chinese Medicine Union HospitalTongji Medical CollegeHuazhong University of Science and Technology Department of Respiratory Diseases Union HospitalTongji Medical CollegeHuazhong University of Science and Technology

To investigate the effect of Dachengqi decoction on NF-κB p65 expression in lung of rats with partial intestinal obstruction and the underlying mechanism, 30 SD rats were randomly divided into three groups： sham-operation group, model group and Dachengqi decoction treatment group （Dachengqi group）, with 10 animals in each group. The models were made by partially ligating their large intestines outside the body. The pathological changes were analyzed by HE staining. The expression of NF-κB p65 in rats lung were measured by using real-time polymerase chain reaction and immunohistochemistry respectively. Moreover, the expression of caveolin-1 in rats lung was also measured to. Increased edema, interstitial thickening, hemorrhage, and infiltration of inflammatory cells were found in the model group. In contrast, this change was significantly reduced in Dachengqi group as compared with model group. In addition, the up-regulated caveolin-1 and NF-κB p65 were also suppressed by Dachengqi decoction in lung of rats with partial intestinal obstruction. We are led to concluded that the caveolin-l-NF-κB pathway plays an important role in the development of lung injury of rats with partial intestinal obstruction and Dachengqi decoction could down-regulate the expression of caveolin-1 and NF-κB p65 in lung of rats with partial intestinal obstruction.

关键词： Dachengqi decoction partial intestinal obstruction lung injury NF-κB p65 caveolin-1

在线全文

学校读者我要写书评

暂无评论

企业制度反应策略模式研究:中国经验

经济管理 2009年第10期35卷 67-74页

作者：邓新明田志龙武汉大学经济与管理学院湖北武汉430072 华中科技大学管理学院湖北武汉430074

本文对转型时期我国企业的制度反应策略模式及其资源基础与绩效表现进行了实证研究。结果表明:(1)在我国的转型制度背景下,企业的制度反应策略可分为基于合作动机的遵守行为、参与行为、关联行为、游说行为与代言行为,以及基于对抗动机... 详细信息

本文对转型时期我国企业的制度反应策略模式及其资源基础与绩效表现进行了实证研究。结果表明:(1)在我国的转型制度背景下,企业的制度反应策略可分为基于合作动机的遵守行为、参与行为、关联行为、游说行为与代言行为,以及基于对抗动机的挑战行为、质疑行为与影响行为;(2.企业制度反应策略与资源具有显著的相关性,其中,制度资源对于企业所采取的合作性制度反应策略具有更强的解释力,而市场资源与企业抵制或挑战现存规则的制度反应行为相关性更显著;(3)企业制度反应策略与绩效也具有显著的关联性,而且基于合作动机的制度反应行为可以使企业获得更显著的绩效,尤其是制度绩效。

关键词：制度理论制度反应行为企业资源企业绩效我国企业

Detection and parameter estimation of multicomponent LFM signal based on the fractional Fourier transform

在线全文

学校读者我要写书评

暂无评论

Science in china(Series F) 2004年第2期47卷 184-198页

作者： QI Lin1, 2. TAO Ran1, ZHOU Siyong1 & WANG Yue1 1. Department of Electronic Engineering, Beijing Institute of technology, Beijing 100081, china 2. {2. of Information Engineering, Zhengzhou university, Zhengzhou 450052. china Correspondence should be addressed to QI Lin (email: qilin@***) Department of Electronic Engineering Beijing Institute of Technology Beijing China school of Information Engineering Zhengzhou University Zhengzhou China

This paper presents a new method for the detection and parameter estimation of multicomponent LFM signals based on the fractional Fourier transform. For the optimization in the fractional Fourier domain, an algorithm based on Quasi-Newton method is proposed which consists of two steps of searching, leading to a reduction in computation without loss of accuracy. And for multicomponent signals, we further propose a signal separation technique in the fractional Fourier domain which can effectively suppress the interferences on the detection of the weak components brought by the stronger components. The statistical analysis of the estimate errors is also performed which perfects the method theoretically, and finally, simulation results are provided to show the validity of our method.

关键词： LFM signal parameter estimation fractional Fourier transform.

Semi-solid Casting of High Speed Steel Ingots Using Inclined Slope Pre-crystallization Method

在线全文

学校读者我要写书评

暂无评论

Journal of wuhan university of technology(Materials Science) 2009年第5期24卷 750-752页

作者：和优锋 State Key Laboratory for Fabrication and Process of Nonferrous Metals General Research Institute for Nonferrous Metals

Semi-solid casting of M2.high speed steel ingots was investigated by inclined slope pre-crystallization method. Effects of casting temperature and slope length on the microstructure of M2.HSS ingots were investigated. M2.cast ingots of non-dendritic primary austenite and fine eutectic ledeburite network carbide structure were obtained, with the casting temperature, slope length and angle of 1480 ℃, 500 mm and 60° respectively. Meanwhile, the microstructure of cast samples was quantitatively assessed by Image tool software. Results show that optimum mean equivalent diameter of primary austenite crystal grain is 50.8 μm, shape factor is 0.83, and mean thickness of network carbide is 5.2. μm.

关键词： M2.high speed steel semi-solid pre-crystallization inclined slope

Effects of deformation parameters on microstructure and mechanical properties of magnesium alloy AZ31B

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2006年第Z2期25卷 105-110页

作者： ZHANG Shaoming YANG Bicheng XU Jun SHI Likai CHEN Guoliang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China General Research Institute for Non-Ferrous Metals Beijing 100088 China General Research Institute for Non-Ferrous Metals Beijing 100088 China General Research Institute for Non-Ferrous Metals Beijing 100088 China General Research Institute for Non-Ferrous Metals Beijing 100088 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

Plastic deformation and dynamic recrystallization (DRX) behaviors of magnesium alloy AZ31B during thermal compression and extrusion processes were studied. In addition, effects of deformation temperature and rates on the microstructure and mechanical properties were investigated. The results show that the DRX grains nucleate initially at the primary grain boundaries and the twin boundaries, and the twinning plays an important role in the grain refinement. The DRX grain size depends on the deformation temperature and strain rate The average grain size is only 1 μm when the strain rate is 5 s-1 and temperature is 2.0 ℃. It is also found that the DRX grain can grow up quickly at the elevated temperature. The microstructure of extruded rods was consisted of tiny equal-axis DRX grains and some elongated grains. The rods extruded slowly have tiny grains and exhibit good mechanical properties.

关键词： magnesium alloy thermal simulation extrusion dynamic recystallization

Autoantibody against Cardiac β1-Adrenoceptor Induces Apoptosis in Cultured Neonatal Rat Cardiomyocytes

在线全文

学校读者我要写书评

暂无评论

Acta Biochimica et Biophysica Sinica 2006年第7期38卷 443-449页

作者： Yan GAO~1 Hui-Rong LIU~1 Rong-Rui ZHAO~1 Jian-Ming ZHI~(2.) 1 Department of Cardiovascular Physiology Shanxi Medical university,Taiyuan 030001,china 2.Department of Physiology,Shanghai Jiaotong university,College of Basic Medicine,Shanghai 2.002.,china Department of Cardiovascular Physiology Shanxi Medical UniversityTaiyuan 030001 China Department of Physiology Shanghai Jiaotong University College of Basic MedicineShanghai 200025 China

To clarify whether apoptosis is involved in the injury processes induced by autoantibodyagainst cardiac β1-adrenoceptor,we investigated the biological and apoptotic effects of antibodies on culturedneonatal rat *** rats were immunized with peptides corresponding to the second extra-cellular loop of the β1-adrenoceptor to induce the production of anti-β1-adrenoceptor antibodies in the ***（Ig）G in the sera was detected using synthetic antigen enzyme-linked immunosorbentassay and purified using the diethylaminoethyl cellulose ion exchange *** of cardiomyo-cytes was evaluated using agarose gel electrophoresis and flow *** results showed that thepositive serum IgG greatly increased the beating rates of cardiomyocytes and showed an"agonist-like"***,positive serum IgG induced cardiomyocyte apoptosis after treatment with β1-adrenoceptor overstimulation for *** effects of monoclonal antibody against β-adrenoceptor werealso found to be similar to those of positive serum *** was suggested that the autoantibody could inducecardiomyocyte apoptosis by excessive stimulation of β1-adrenoceptor.

关键词： β1-adrenoceptor rat cardiomyocyte autoantibody apoptosis