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Design and Analysis of Microstrip Multi-Channeled Filter Using Photonic Crystal Branchy Defect

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Journal of Rare Earths 2006年第z1期24卷 136-139页

作者： li Yunhui Jiang Haitao He li li Hongqiang zhang Yewen chen Hong Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China Pohl Institute of Solid State Physics Tongji University Shanghai 200092 China

A multi-channeled filter based on branchy defect in a microstrip photonic crystal was proposed. By introducing a branchy structure across the defect region, multiple defect modes will appear inside the photonic gap, leading to the multi-channeled filtering phenomenon. In comparison with the conventional multi-channeled filters, the proposed structure is more compact and tunable as far as the device volume and fabrication are concerned. The microwave experiment results are found in agreement with simulation results.

关键词： photonic crystals defect mode multi-channeled filter

Re:''Laparoscopic vs open approach to resection of hepatocellular carcinoma in patients with known cirrhosis:Systematic review and meta-analysis''

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World Journal of Gastroenterology 2015年第1期21卷 377-378页

作者： Zhan-Zhan li li-zhang chen Department of Epidemiology and Health Statistics School of Public HealthCentral South University

Twaij and colleagues have carried out a meta-analysis of cohort studies to review the currently available literature comparing laparoscopic to open resection of hepatocellular carcinoma in patients with known liver **... 详细信息

关键词： Meta-analysis Standardized mean difference Heterog

Novel Macrocycles Bearing Dithienylethene Units and Urea Functional Groups Synthesis, Structure and Photochromic Property

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Chinese Journal of Chemistry 2013年第5期31卷 627-634页

作者： Tangxin Xiao Shaolu li Xiaoning zhang chen lin LeyongWang Key Laboratory of Mesoscopic Chemistry of Ministry of Education Center for Multimolecular Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing Jiangsu 210093 China

Two novel photochromic macrocycles 1 and 2 bearing dithienylethene units and urea building blocks have been synthesized, and their photochromic properties are described. Macrocycle 2 shows good photochromic properties, while the relatively smaller size of macrocycle 8h exhibits photochemically inactive properties due to the unfa- vourable ring conformational constraint. Moreover, the crystal structures of the urea-protected precursor macrocyles 3a, 3h, and 8b are presented.

关键词： photochromism macrocycles dithienylethene urea derivatives supramolecular chemistry

High performance liquid chromatography with immobilized Ru(bpy)_3^(2+)-KMnO_4 chemiluminescence detection and its application in metabolism of repaglinide in pig liver microsomes

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Chinese Chemical Letters 2011年第10期22卷 1245-1248页

作者： Ai Hua Fu Zhu Jun zhang li li chen Xiao Ming zhang Pan Xue Key Laboratory of Analytical Chemistry for life Science of Shaanxi Province School of Chemistry and Materials Science Shaanxi Normal University Xi＇ an 710062 China

A novel high performance liquid chromatography-chemiluminescence（HPLC-CL） method for investigation of in vitro metabolism of repaglinide in pig liver microsomes with microdialysis sampling technique was *** chromatographic separation was performed on a Hypersil BDS-C18 column with an isocratic mobile phase consisting of methanol and 0.01 mol/L KH_2PO_4（pH 3.0）（volume ratio 75：25） at a flow rate of 1.0 mL/*** detection was based on the chemiluminescence reaction of repaglinide with acidic potassium permanganate（KMnO_4） and tris（2,2＇-bipyridyl）ruthenium（Ⅲ）（Ru（bpy）_3^（3＋））,which was immobilized on the cationic ion-exchange resin for obtaining high sensitivity and reducing consumption of expensive reagent.

关键词： High performance liquid chromatography Chemiluminescence Microdialysis Repaglinide Immobilized Ru(bpy)_3^(2+)

Effect of rare-earth element Sm on the corrosion behavior of Mg-6Al-1.2Y-0.9Nd alloy

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Rare Metals 2010年第6期29卷 557-560页

作者： li Quan’an,li Xiaofeng,zhang Qing,and chen Jun School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471003,China School of Materials Science and Engineering Henan University of Science and Technology Luoyang China

The effect of Sm（0 wt.%-2 wt.%） addition on the corrosion behavior of Mg-6Al-1.2Y-0.9Nd alloy in 3.5 wt.% NaCl solution has been studied by static corrosion tests,corrosion morphology observation,corrosion scale and microstructure *** results show that,with the increasing of Sm content,the corrosion rate of the alloy decreases at first,then increases and reaches the valley at 0.5 wt.% *** reason is that the proper content of Sm addition can refine the precipitates and make the component and microstructure uniform,and therefore,it remarkably improves the corrosion resistance of the alloy.

关键词： magnesium alloys samarium corrosion behavior microstructure

Drag reduction and shear resistance properties of ionomer and hydrogen bond systems based on lauryl methacrylate

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Petroleum Science 2011年第3期8卷 357-364页

作者： Yu Ping li Changyu zhang Changqiao chen Shiwei Fang Shu Sun Hui School of Chemistry and Chemical Engineering Shandong University Jinan 250061 China

Based on molecular dynamics simulation results, a lauryl methacrylate polymer with drag reduction and shear resistance properties was designed, and synthesized by emulsion polymerization using 2-vinyl pyridine and methyl methacrylate as the polar polymerization monomer. After ionization of lauryl methacrylate polymer, an ion-dipole interaction based drag reduction agent （DRA） was obtained. The existence of ion-dipole interaction was proven through characterization of the drag-reducing agent from its infrared （IR） spectrum. The pilot-scale reaction yield of the DRA under optimum conditions was investigated, and the drag reduction and shear resistance properties were measured. The results show that： l） The ion-dipole or hydrogen bonding interaction can form ladder-shaped chains, therefore the synthesized DRA has shear resistance properties; 2） The larger the molecular weight （MW） and more concentrated the distribution of MW, the better the drag reduction efficiency and the performance of the ionomer system was superior to that of the hydrogen bonding system; 3） With increasing shear frequency, the drag-reduction rates of both the DRAs decreased, and the drag reduction rate of the ionomer system decreased more slowly than of the corresponding hydrogen bonding system. From the point of view of drag reduction rate and shear resistance property, the ionomer system is more promising than the hydrogen bonding system

关键词： Molecular design ion-dipole interaction hydrogen bonding drag reduction rate shearresistance property

Cerium enrichment on sinter skin of mischmetal doped WC-Co cemented carbide

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Journal of Central South University of Technology 2005年第z1期12卷 5-8页

作者： zhang li chen Shu XIONG Xiang-jun HUANG Bai-yun zhang Chuan-fu State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China Changsha Mining and Metallurgy Research Institute Changsha 410012 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China School of Metallurgical Science and Engineering Central South University Changsha 410083 China

Rare earth-doped WC-Co cemented carbides with low carbon-containing level were prepared by adding mischmetal (mainly containing lanthanum and cerium) in the form of cobalt pre-alloyed powder during *** sintering, the sinter skin (exterior) was observed and analyzed by scanning electron microscopy(SEM)and energy disperse X-ray spectroscopy(EDXS). The results show that during the sintering process lanthanum and cerium are separated and cerium predominantly migrates towards the surface forming precipitates containing *** analysis and polarization of cerium atom caused by the strong interaction between cerium atoms and high energy carbon atoms were used in explaining the observed phenomenon.

关键词： hardmetal lanthanum cerium atom polarization thermoldynamics enrichment

Application of High Performance liquid Chromatography to Separation of Novel Chiral Tetrahedral Heterometal Clusters

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Chinese Chemical Letters 2003年第9期14卷 942-945页

作者： Xin Yi ZHU, Wei Qiang zhang, Yu Hua zhang, li Ren chen, Yong Min li Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000 Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000

A series of novel chiral tetrahedral heterometal clusters have firstly been separated on cellulose tris-(3,5-dimethylphenylcarbamate) stationary phase by high performance liquid chrom-atography, using hexane as the mo... 详细信息

关键词： Chiral stationary phase cellulose tris-(3 5-dimethylphenylcarbamate) mobile-phase composition chiral tetrahedral clusters enantioseparation.

Influence of O_2/Ar ratio on the properties of transparent conductive niobium-doped ZnO films

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Chinese Science Bulletin 2009年第13期54卷 2217-2220页

作者： CAO Feng WANG YiDing liU KuiXue YIN JingZhi LONG BeiHong li li zhang Yu chen XiaMei State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun130012 China

Niobium-doped ZnO transparent conductive films are deposited on glass substrates by radio frequency sputtering at 300℃.The influence of O2/Ar ratio on the structural,electrical and optical properties of the as-deposited films is investigated by X-ray diffraction,Hall measurement and optical transmission *** lowest resistivity of 4.0×10-4Ω·cm is obtained from the film deposited at the O2/Ar ratio of 1/*** average optical transmittance of the films is over 90%.

关键词： ZnO薄膜透明导电光学性能铌掺杂 Hall测量射频溅射玻璃基板薄膜沉积