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A lumped mass finite element method for vibration analysis of elastic plate-plate structures

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Science china Mathematics 2010年第6期53卷 1453-1474页

作者： LAI JunJiang1,HUANG JianGuo2,3,& SHI ZhongCi4.1Department of Mathematics,Minjiang University,Fuzhou 350108,china 2Department of Mathematics,shanghai Jiao Tong University,shanghai 20024.,china 3Division of Computational Science,E-{4. of shanghai Universities,shanghai Normal University,shanghai 200234.china 4.4. of Computational Mathematics,Academy of Mathematics and Systems Science,Chinese Academy of Sciences,Beijing 100190,china 1. Department of Mathematics Minjiang University Fuzhou 350108 China2. Department of Mathematics Shanghai Jiao Tong University Shanghai 200240 China3. Division of Computational Science E-Institute of Shanghai Universities Shanghai Normal University Shanghai 200234 China4. Institute of Computational Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

The fully discrete lumped mass finite element method is proposed for vibration analysis of elastic plate-plate *** the space directions,the longitudinal displacements on plates are discretized by conforming linear elements,and the transverse displacements are discretized by the Morley *** means of the second order central difference for discretizing the time derivative and the technique of lumped masses,a fully discrete lumped mass finite element method is obtained,and two approaches to choosing the initial functions are also *** error analysis for the method in the energy norm is established,and some numerical examples are included to validate the theoretical analysis.

关键词： vibration analysis plate-plate structures lumped mass FEM error analysis

Microstructure and Properties of Plasma Spraying Boron Carbide Coating

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Journal of Materials Science & Technology 2000年第1期16卷 63-66页

作者： Yi ZENG, Jingwei FENG and Chuanxian DING (shanghai institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, shanghai 200050, china) shanghai institute of Ceramics Chinese Academy of Sciences 1295 Dingxi Road Shanghai 200050 China

Microstructure of plasma spray boron carbide coating was studied by SEM and TEM. Its physical, mechanical and electrical properties were measured. The results showed that high microhardness, modulus and low porosity of B4. coating were manufactured by plasma spray. It was lamellar packing and dense. The B4. coating examined here contained two principal structures and two impurity phase besides major phase. The relatively small value of Young's modulus, comparing with that of the bulk materials, is explained by porosity . The Fe impurity phase could account for the relatively high electrical conductivity of boron carbide coating by comparing with the general boron carbide materials.

关键词： Microstructure and Properties of Plasma Spraying Boron Carbide Coating

EVALUATION OF PERMEABILITY STABILITY OF SEVERAL AMORPHOUS FERROMAGNETIC ALLOYS

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Acta Metallurgica Sinica(English Letters) 1990年第9期3卷 181-184页

作者： ZHANG Yanzhong shanghai Iron and Steel research institute,shanghai,{4. ZHANG Yanzhong Senior Engineer,Measuring and Testing Centre,shanghai Iron and Steel research institute,shanghai 20094.,{4.

The evaluation of the relative stability of initial permeability has been made of the pre-an- nealed amorphous ferromagnetic alloys Fe_(76)Si_(10)B_(14.,Fe_(4.)Ni_(38)Mo_4._(18) and (Fe_(0.1)Ni_(0.35)Co_(0.55))_78Si_8B_(14. by the experimental values of average activation energy and fre- quency factors on the basis of the empirical expression deduced by experimental data of the kinetics of their permeability *** results show that the relative stability of permeability is sufficient for practical uses in the temperature range within 100℃,although the permeability instability can not be substantially *** other words,the permeability decay is considerably small within a period of considerable length.

关键词： permeability decay activation energy frequency factor

Insulin-sensitizing effects of a novel α-methyl-α-phenoxylpropionate derivative in vitro

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Acta Pharmacologica Sinica 2007年第3期28卷 417-422页

作者： Hao-shu WU~(2,4. Juan-hong YU~(3,4. Ying-yin LI~2 Yu-she YANG~3 Qiao-jun HE~2 Yi-jia LOU~(2,5) Ru-yun JI~3 ~2Department of Pharmacology and Toxicology,College of Pharmaceutical Sciences,Zhejiang University,Hangzhou 310058,china ~3State Key Laboratory of Drug research,shanghai institute of Materia Medica,shanghai institutes for Biological Sciences,Graduate School of the Chinese Academy of Sciences,shanghai 201203,china Department of Pharmacology and Toxicology College of Pharmaceutical Sciences Zhejiang University Hangzhou 310058 China Department of State Key Laboratory of Drug research Shanghai Institute of Materia Medica Shanghai Institutes for Biological Sciences Graduate School of the Chinese Academy of Sciences Shanghai 201203 China

Aim:To examine the insulin sensitizing effects of a novel α-methyl-α-phenoxylpropionate derivative YY20 in insulin-sensitive cell ***:Theperoxisome proliferator-activated receptor γ（PPARγ）agonist bioactivities of YY20were detected by a preadipocyte differentiation ***-PCR and Westernblotting analysis were used to detect the expression of the target gene or *** effects of YY20 on insulin-mediated glucose consumption were determined inthe HepG2 human hepatocellular carcinoma ***:YY20 could enhancethe differentiation of preadipocytes to adipocytes and upregulate the gene ex-pression of PPARγ2,as well as the protein expression of insulin receptor sub-strate-1（IRS-1）,glucose transporter-4.GLUT4.,and adiponectin（ACRP30）.Theeffects on GLUT4.and ACRP30 could be reversed by the PPARγ inhibitor ***,YY20 efficiently reduced glucose consumptions in HepG2 cells after24.h culture,and the effects were related to insulin and YY20 ***:YY20,a potential insulin-sensitizing agent like rosiglitazone,couldenhance glucose consumption in HepG2 cells in a concentration-and insulin-dependent *** may improve the insulin resistance associated with type 2diabetes.

关键词： YY20 peroxisome proliferator-activated receptor y insulin sensitivity glucose consumption

How random are matrix elements of the nuclear shell model Hamiltonian?

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Science china(Physics,Mechanics & Astronomy) 2009年第10期52卷 1477-1481页

作者： SHEN JiaJie1 & ZHAO YuMing1,2,3,4.1 Department of Physics,shanghai Jiao Tong University,shanghai 20024.,china 2 Center of Theoretical nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,china 3 Nishina Center,institute of Physical Chemical research(RIKEN),Hirosawa 2-1,Wako-shi,Saitama 351-0198,Japan 4.CCAST,World Laboratory,Beijing 100080,china Department of Physics Shanghai Jiao Tong University Shanghai 200240 China Center of Theoretical nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China Nishina Center Institute of Physical Chemical Research (RIKEN) Hirosawa 2-1 Wako-shi Saitama 351-0198 Japan World Laboratory CCAST Beijing 100080 China

In this paper we study the general behavior of matrix elements of the nuclear shell model *** find that nonzero off-diagonal elements exhibit a regular pattern,if one sorts the diagonal matrix elements from smaller to larger *** correlation between eigenvalues and diagonal matrix elements for the shell model Hamiltonian is more remarkable than that for random matrices with the same distribution unless the dimension is small.

关键词： nuclear shell model geometry property linear correlation randomize

Dominant climate factors influencing the Arctic runoff and association between the Arctic runoff and sea ice

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Acta Oceanologica Sinica 2010年第5期29卷 10-20页

作者： LI Pixue ZHANG Zhanhai LIU Jiping Ocean University of china Qingdao 266100 China Polar research institute of china Shanghai 200136 China State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China shanghai Marine Environmental Monitoring and Forecasting Center Shanghai 200232 China

By using the Arctic runoff data from R-ArcticNET V4.0 and ArcticRIMS,trends of four major rivers flowing into the Arctic Ocean,whose climate factor plays an important role in determining the variability of the Arctic runoff,are *** results show that for the past 30 years,the trend of the Arctic runoff is seasonally *** is a significant trend in spring and winter and a significant decreasing trend in summer,leading to the reduced seasonal *** spring,surface air temperature is the dominant factor influencing the four *** summer,precipitation is the most important factor for Lena and Mackenzie,while snow cover is the most important factor for Yenisei and *** Mackenzie,atmospheric circulation does play an important role for all the seasons,which is not the case for the Eurasian *** authors further discuss the relationships between the Arctic runoff and sea *** negative correlation is found at the mouth of the rivers into the Arctic Ocean in spring,while significant positive correlation is observed just at the north of the mouths of the rivers into the Arctic in *** addition,each river has different relationship with sea ice in the eastern Greenland Sea.

关键词： Arctic runoff multiple linear regressions sea ice

Microstructure and Mechanical Properties of Dy-α-sialon/Nano-size SiC Composites

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Journal of Materials Science & Technology 1997年第4期13卷 336-338页

作者： Danyu JIANG Chen ZHANG Jianlin SHI Tingrong LAI and Dongsheng YAN(shanghai institute of Ceramics, Chinese Academy of Sciences, shanghai 200050, china) shanghai institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

The composite of Dy-α-sialon/10 wt pct nano-size SiC particles has been prepared from precursor powders of Si3N4. AIN, Al2O3, Dy2O3 and nano-size β-SiC. The hardness, toughness and bending strength of the composite at ambient temperature are a little higher than those of Dy-α-*** the bending strength is maintained up to 1000℃ and about 2 times more than that of Dy-α-sialon at the same temperature. The fracture surfaces show that the grain size of the composite is smaller than that of Dy-α-sialon, and both Of them have predominately transgranular mode of fracture. It is believed that the decrease of the bending strength of Dy-α-sialon at elevated temperature is caused by the viscous flow of the grain boundary phase, while the addition of nanosize SiC particles effectively increases the viscosity of the grain boundary phase and therefore prevents the strength loss of Dy-α-sialon/nano-size SiC composites at elevated temperature

关键词： Microstructure and Mechanical Properties of Dy sialon/Nano-size SiC Composites SiC Nano

Identification and Characterization of glnA Promoter and its Corresponding Trans-regulatory Protein GlnR in the Rifamycin SV Producing Actinomycete,Amycolatopsis mediterranei U32

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Acta Biochimica et Biophysica Sinica 2006年第12期38卷 831-843页

作者： Hao YU~(1&) Wen-Tao PENG~1 Yang LIU~1 Ting WU~2 Yu-Feng YAO~1 Ming-Xue CUI~1 Wei-Hong JIANG~1 Guo-Ping ZHAO~(1,3,4.) 1 Laboratory of Molecular Microbiology,institute of Plant Physiology and Ecology,shanghai institutes for Biological Sciences,Chinese Academy of Sciences,shanghai 200032,{4. 2 Department of Medicinal Chemistry,School of Pharmacy,Fudan University,shanghai 200032,{4. 3 State Key Laboratory of Genetic Engineering & Department of Microbiology,School of Life Science,Fudan University,shanghai 2004.3,{4. 4.Laboratory of Disease and Health Genomics,Chinese National Human Genome Center at shanghai,shanghai 201203,{4. Laboratory of Molecular Microbiology Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200032 China Department of Medicinal Chemistry School of Pharmacy Fudan University Shanghai 200032 China State Key Laboratory of Genetic Engineering & Department of Microbiology School of Life Science Fudan University Shanghai 200433 China Laboratory of Disease and Health Genomics Chinese National Human Genome Center at Shanghai Shanghai 201203 China

The genetic requirements for the transcription of glnA,encoding the major glutaminesynthetase in a rifamycin SV-producing Amycolatopsis mediterranei strain,U32,were *** experiments showed that the promoter of U32 glnA （pglnA） was likely to have two transcriptioninitiation sites:P1and P2,located 157 and 4. nucleotides （nt） upstream of the translational start codon,*** mobility shift and DNase I footprinting analyses revealed a 30 bp cis-element locatedat 4. to 75 nt downstream of P1,or 38 to 68 nt upstream of *** sequence of the cis-element displayedhigh similarity to the corresponding regions of pglnA from Streptomyces coelicolor and *** as a reporter gene,the expression levels of U32 pglnA and its deletion derivatives under differentnitrogen-source conditions were analyzed by detecting the catechol dioxygenase activities in ***54.*** J508 and *** FS10 （glnR mutant）.These in vivo studies showed that theactivation of U32 pglnA in *** required GlnR,and its binding to the U32 pglnA was furtherconfirmed by the gel mobility shift *** and heterologous expression of the U32 glnR allowed usto detect the in vitro interaction between the U32 GlnR and the corresponding pglnA *** shown by in vivo glnR inactivation and complementation indicated that GlnR is essential for theactive transcription of glnA in U32.

关键词： glnA promoter cis-element glnR Amycolatopsis mediterranei

The in vitro reconstitution of nucleosome and its binding patterns with HMG1/2 and HMG14.17 proteins

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Cell research 2003年第5期13卷 351-359页

作者： SHU BING ZHANG, JIAN HUANG, HUI ZHAO, YI ZHANG, CHUN HuI HOU, XIAO DONG CHENG, CHU JIANG, MIN QIAN LI, JUN HU, RUO LAN QIAN 1 Group of Globin Gene Expression and Regulation, State Key Laboratory of Molecular Biology, institute of Biochemistry and Cell Biology, shanghai institutes for Biological Sciences, Chinese Academy of Sciences, shanghai 200031,{4.. 2 shanghai institute of nuclear research, Chinese Academy of Sciences, shanghai 201.00,{4. Group of Globin Gene Expression and Regulation State Key Laboratory of Molecular Biology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China

Using atomic force microscopy (AFM), the dynamic process of the in vitro nucleosome reconstitution followed by slow dilution from high salt to low salt was visualized. Data showed that the histone octamers were dissociated from DNA at 1M NaCl. When the salt concentration was slowly reduced to 650 mM and 300 mM, the core histones bound to the naked DNA gradually. Once the salt concentration was reduced to 50 mM the classic 'beads-on-astring' structure was clearly visualized. Furthermore, using the technique of the in vitro reconstitution of nucleosome, the mono- and di- nucleosomes were assembled in vitro with both HS2core (-10681 to -10970 bp) and NCR2 (-372 to -194.bp) DNA sequences in the 5’flanking sequence of human b-globin gene. Data revealed that HMG 1/2 and HMG 14.17 proteins binding to both DNA sequences are changeable following the assembly and disassembly of nucleosomes. We suggest that the changeable binding patterns of HMG 14.17 and HMG1/2 proteins with these regulatory elements may be criti

关键词： atomic force microscopy HMG proteins (HMG1/2 and HMG14.17) human β-globin gene in vitro reconstitution nucleosome.