检索结果-南通市图书馆

Shape Optimization in Two-Dimensional Viscous Compressible Fluids

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2010年第9期26卷 1793-1806页

作者： Zhong TAN ying hui zhang School of Mathematical Sciences Xiamen University Xiamen 361005 P. R. China Department of Mathematics Hu'nan Institute of Science and Technology Yueyang 414006 P. R. China

We present a method for solving the optimal shape problems for profiles surrounded by viscous compressible fluids in two space dimensions. The class of admissible profiles is quite general including the minimal volume condition and a constraint on the thickness of the boundary. The fluid flow is modelled by the Navier-Stokes system for a general viscous barotropic fluid with the pressure satisfying p（o） = aQlog^d（o） for large Q. Here d 〉 1 and a 〉 0.

关键词： Optimization shape Orlicz spaces Navier-Stokes equations

Asymptotic Behaviour of Solutions to the Navier-stokes Equations of a Two-dimensional Compressible Flow

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2011年第4期27卷 697-712页

作者： ying-hui zhang Zhong TAN Department of Mathematics Hunan Institute of Science and Technology Yueyang 414006 China School of Mathematical Sciences Xiamen University Fujian 361005 China

In this paper, we are concerned with the asymptotic behaviour of a weak solution to the Navier-Stokes equations for compressible barotropic flow in two space dimensions with the pressure function satisfying p（g） = aglog^d（g） for large g. Here d 〉 2, a 〉 0. We introduce useful tools from the theory of Orlicz spaces and construct a suitable function which approximates the density for time going to infinity. Using properties of this function, we can prove the strong convergence of the density to its limit state. The behaviour of the velocity field and kinetic energy is also briefly discussed.

关键词： asymptotic behaviour Navier-stokes equations compressible barotropic flow Orlicz spaces

Houttuynia cordata Thunb rescues retinal ganglion cells through inhibiting microglia activation in a rat model of retinal ischemia-reperfusion

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2020年第12期13卷 1880-1886页

作者： Le-Meng Ren ying-hui zhang The First Clinical Medical College Lanzhou UniversityLanzhou 730000Gansu ProvinceChina Medical Record Room the Second Hospital of Shandong UniversityShandong UniversityJinan 250033Shandong ProvinceChina

AIM:To determine whether Houttuynia cordata Thunb(HCT)can increase the survival of the retinal ganglion cells(RGCs)and inhibit microglia activation following retinal ischemia-reperfusion(RIR)***:Rat model of RIR was induced by transient elevation of the intraocular pressure(IOP).HCT was orally administered for 2 d before the performance of retinal RIR model and once a day for the next 14 *** 14 d of RIR injury,the rats were sacrificed for further *** RGCs were stained with haematoxylin and eosin(H&E).Apoptosis of RGCs was detected by TUNEL *** function was examined by flash-electroretinography(F-ERG).Retinal microglia were labeled using Iba-1,one specific marker for *** m RNA expression levels of inducible nitric oxide synthase(i NOS),tumor necrosis factor alpha(TNF-α),and interleukin 1 beta(IL-1β)were assessed by quantitative real time reverse transcription polymerase chain reaction(q RT-PCR).RESULTS:Systemic HCT treatment significantly reduced RGCs death by H&E staining and exhibited an anti-apoptotic effect as assessed by TUNEL staining at day 14 after RIR *** greatly improved the retinal function as examined by *** number of activated microglia significantly increased after RIR injury,which was significantly attenuated by HCT ***,RIR injury induced a strong upregulation of pro-inflammatory genes TNF-α,i NOS and IL-1βm RNAs at day 14 post injury,which was suppressed by ***:Neuroprotective effects of HCT encourage the survival of RGCs through inhibiting microglia activation due to RIR *** these results support the use of HCT as promising therapy for the ischemic events of the retina diseases.

关键词： Houttuynia cordata Thunb retinal ganglion cell microglia activation retinal ischemia-reperfusion

Syntheses,structures,luminescent and magnetic properties of two coordination polymers based on a flexible multidentate carboxylate ligand

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2015年第5期26卷 499-503页

作者： Dan Tian Xiao-Jing Liu Rong-ying Chen ying-hui zhang Department of Chemistry and TKL of Metal-and Molecule-Based Material Chemistry Key Laboratory of Advanced Energy Materials Chemistry(MOE)and Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Nankai University

Two coordination polymers, {[Cu3（tci）2（DMAc）3].6DMAc-2H2O}n （1[） and {[Cu3（tci）2（tpt）2（H2O）2]- 2DMAc-2H2O}n （2）（H3tci = tris（2-carboxyethyl）isocyanurate, tpt = 2,4,6-tris（4-pyridyl）-l,3,5-triazine, DMAc = N,N-dimethylacetamide）, have been constructed under solvothermal conditions. Both polymers were structurally characterized by single crystal X-ray diffraction, elemental analyses, IR spectra, thermogravimetric （TG） analyses and powder X-ray diffraction （RXPD）. 1 shows a （3,4）-connected 2D layer structure comprising Cu2（CO2）4 paddle-wheel units, which are further bridged by C-H.--O interactions to give a 3D supramolecular network. The introduction oftpt produces different framework for 2 that comprises a dinuclear and a mononuclear Cu（II） building units, which are further bridged together by tci3- and tpt ligands to give a 4-connected 2D topological net. Adjacent 2D layers are packed together via C-H...O interactions and π...π stacking interactions to form a 3D supramolecular structure. In addition, the luminescent properties and the solid-state UV-vis spectra of I and 2 were explored. Furthermore, antiferromagnetic exchange interactions were unveiled in the Cu2（COO）4 units of 1. ~ 2015 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

关键词： Coordination polymers X-ray crystallography Copper Magnetic properties Luminescence

A μ_3-OH^-bridged two-dimensional zinc(Ⅱ) coordination polymer based on an anthryl ligand:Synthesis,characterization and luminescent properties

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2013年第4期24卷 270-272页

作者： Jun-Jie Wang You-Juan zhang Ze Chang ying-hui zhang School of Chemistry and Chemical Engineering Anyang Normol University Department of Chemistry and Tianjin Key Lab of Metal and Molecule-based Material ChemistryNankai University

A two-dimensional （2D） 3,3,3,4,5,5,6-connected ZnII coordination compound [Zns（L）2（OH）6｜∞ （L = 9,10- dioxo-9,10-dihydroanthracene-l,8-dicarboxylate） has been synthesized and characterized by IR, elemental analysis, X-ray powder diffraction and single crystal X-ray diffraction analysis. Moreover, the luminescent properties of the ligand and corresponding compound have been briefly investigated.

关键词： Metal-organic frameworkZinc(ll) compoundCoordination networkLuminescence property

An effective method for the preparation of chlorolactones

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第4期22卷 431-434页

作者： Min Zhu Li Li Jiang ying Tong hui zhang College of Biological and Environmental Sciences Zhejiang Shuren University Hangzhou 310015 China

The effective chlorolactonization of alkenoic acids with（diacetoxyiodo）benzene and lithium chloride under mild conditions have been *** show that various 4-pentenoic acids react with（diacetoxyiodo）benzene and lithium chloride fluently in CH_3OH at room temperature,obtaining five-membered chlorolactones in good yields in short *** alkenoic acids,such as 3-butenoic acid and trans 3-hexenoic acid give some more complicated results,and 4-pentynoic acid provides a chloroenol lactone with Z configuration in 40%of yield.

关键词： Chlorolactone (Diacetoxyiodo)benzene Alkenoic acid Preparation

Inhibitory effect of Houttuynia cordata Thunb on LPS-induced retinal microglial activation

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2019年第7期12卷 1095-1100页

作者： ying-hui zhang Le-Meng Ren Xiao-Yun Wang The Second Hospital of Shandong University Shandong UniversityJinan 250033 Shandong ProvinceChina The First Clinical Medical College Lanzhou UniversityLanzhou 730000 Gansu ProvinceChina

AIM: To identify the effect of Houttuynia cordata Thunb(HCT) on lipopolysaccharide(LPS)-induced microglial activation and investigate its possible molecular mechanisms. METHODS: The primary retinal microglial cells were cultured from the retinas of newborn Sprague-Dawley rats and exposed to LPS, and/or HCT with different concentrations. The survival ability of retinal microglia cells was tested by standard MTT method. BrdU cell proliferation assay was used to evaluate the proliferation of retinal microglia. Inflammatory factors in the culture supernatants, including TNF-α, iNOS and IL-1β, were measured using ELISA. Microglia cells’ migration was determined with Transwell migration assay. The total p38-MAPK and phosphorylation of p38-MAPK(p-p38-MAPK) were detected with Western ***: Primary retinal microglia in culture exposed to LPS to induce microglia activation. Pretreatment with HCT significantly inhibited the LPS-induced cell proliferation, but not the cell viability. LPS induced inflammatory reaction in microglia and cell migration. HCT significantly reduced LPS-stimulated release of pro-inflammatory factors and decreased the number of migrating cells substantially in a concentration-dependent manner. Moreover, the protein levels of p-p38 MAPK were identified as the up regulation and co-treatment with HCT obviously inhibited the upregulation of p-p38 MAPK, but had no effect on the levels of total ***: The data suggest that HCT inhibits LPSinduced retinal microglial activation via suppression of the p-p38-MAPK. HCT may be used for the treatment of ocular diseases characterized by over-activated microglia.

关键词： Houttuynia cordata Thunb microglia activation retina inhibitory effect

Synthesis,structure and magnetic properties of manganese(Ⅱ)coordination polymer with azido and zwitterionic dicarboxylate ligand

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第6期25卷 854-858页

作者： Rong-Mei Wen Song-De Han Hao Wang ying-hui zhang Department of Chemistry Tianjin Key Laboratory of Metal and Molecule-based Material Chemistryand Key Laboratory of Advanced Energy Materials Chemistry(MOE)Nankai University

A coordination polymer formulated as {[Mn2L（N3）4]·2H2O）n（1） [L = 1,4-bis（pyridinil-3-carboxylato）-1,4- dimethylbenzene] was synthesized and structurally and magnetically characterized. The uniform Mn（Ⅱ） chains with mixed （μ-EO-N3）2（μ-COO） triple bridges （EO = end-on） are linked by L ligands to generate a 2-fold interpenetrating 3D framework. Meanwhile, magnetism analysis reveals antiferromagnetic coupling for 1.

关键词： Manganese(Ⅱ) Azido anion Magnetism 1,4-Bis(pyridinil-3-carboxylato)-1,4-dimethylbenzene

Impact of the flexibility of pillar linkers on the structure and CO_2 adsorption property of ‘‘pillar-layered'' MOFs

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2017年第1期28卷 55-59页

作者： Yue-Ling Xu Qiang Gao Meng Zhao Huan-Jun zhang ying-hui zhang Ze Chang School of Materials Science and Engineering National Institute for Advanced Materials TKL of Metal and Molecule-Based Material ChemistryNankai University Tianjin 300350 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University Tianjin 300071 China

A new metal–organic framework {[Zn2（bpta）（bpy-ee）（H2O）2]·x solve}n（1）（H4bpta = biphenyl-2,20,6,60-tetracarboxylic acid and bpy-ee = 1,2-bis（4-pyridyl）ethylene） has been obtained under hydrothermal condition, and structurally characterized by single-crystal X-ray diffraction. Complex 1 reveals a threedimensional（3D） “pillar-layered” framework with non-flexible linker, in which some different structure characters can be found compared to that of some related other “pillar-layered” MOFs based on flexible pillar linkers. It demonstrates the impact of the flexibility of pillar linker on the final structure in this system. In addition, the selective CO2 adsorption performance of 1 was also investigated.

关键词： Metal-organic framework Pillar-layer structure Flexibility CO2 Adsorption Selectivity