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Online diagnosis of electron excitation temperature in CH_4+H_2.discharge plasma at atmospheric pressure by optical emission spectra

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Science china(Physics,Mechanics & Astronomy) 2008年第12期51卷 1892-1896页

作者： CUI JinHua1, XU ZhenFeng2. ZHANG JiaLiang3↑, NIE QiuYue3, XU GenHui4 & REN LongLiang5 1 Faculty of Chemistry and chemical Engineering, Liaoning Normal univer.ity, Dalian 11602., {2. 2.Technique Center for Modern Education, Liaodong college, Dandong 12.709, {2. 3 State Key Laboratory for Materials Modification by Laser, Ion and Electron Beams, Dalian univer.ity of Technology, Dalian 11602., {2. 4 college of chemical Engineering, tianjin univer.ity, tianjin 300072. china 5 Department of Physics, Science college, tianjin univer.ity, tianjin 300072. china Faculty of Chemistry and chemical Engineering Liaoning Normal University Dalian China Technique Center for Modern Education Liaodong College Dandong China State Key Laboratory for Materials Modification by Laser Ion and Electron Beams Dalian University of Technology Dalian China college of chemical Engineering Tianjin University Tianjin China Department of Physics Science College Tianjin University Tianjin China

Methane coupling under low temperature plasmas at atmospheric pressure is a green process by use of renewable sources of energy. In this study, CH4+H2.dis- charge plasma was on-line diagnosed by optical emission spectra so as to char- acterize the discharge system and to do spade work for the optimization of the technical parameters for future commercial production of methane coupling under plasmas. The study was focused on a calculation method for the online diagnosis of the electron excitation temperature in CH4+H2.discharge plasma at atmospheric pressure. The diagnostic method is easy, efficient and fairly precise. A serious er- ror in a literature was corrected during the reasoning of its series of equations formerly used to calculate electron temperatures in plasmas.

关键词： low temperature plasma electron excitation temperature optical emission spectrum online diagnosis

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Ceramics Grinding Under the Condition of Constant Pressure

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厦门大学学报（自然科学版） 2002年第S1期41卷 124-125页

作者： SHEN Jian-yun 1,2. LUO Can-bin 1, XU Xi-peng 1, XU Yan-sheng 2.(1. college of Mechanical Engineering and Automation, Huaqiao univers {2., Quanzhou 362.11, china 2. college of Mechanical Engineering, tianjin univer.ity, tianjin 300072. china )

To meet the increasing demand on the quality and co st of precision components for the semiconductor industries, extensive studies on high efficiency and precision machining of ceramic materials have been conducted over the past several years. It is found that the effects of grinding pressure and rotational speed of spindle in the machining for the ceramic materials are v ery significant on the quality of the grinding process. In order to achieve stab le grinding conditions for improved performance, a new grinding control scheme i n which the grinding pressure is maintained constant throughout the grinding pro cess was carried out in the present study. The surface quality of ground ceramics depends on the mechanism of material remo val in the vertical grinding process. For grinding of Si 3N 4 and glass under the condition of constant pressure, increasing pressure enhances material remova l rate, and at the same time causes more machining-induced microcracks on the g round surfaces. Along with the analysis of tangential forces, specific grinding energy, and the micro observations on ground surfaces, it can be found that low pressure and high wheel speed should be selected to high efficiently remove cera mics in ductile mode in the vertical grinding. From the theoretically analytical and measured grinding temperatures in the vert ical grinding of ceramics, it is found that the analytical temperature profile w ithε= 55% has the same trend with the measured one. The measured temperature is higher that the analytical one at the beginning stage of grinding process, whic h might be contributed to the unstable grinding condition of this stage. The gri nding temperatures in the vertical grinding of ceramics under a constant are not high enough for glassy phase formation, and may not reduce surface fracture as expected. However, the temperature in dry grinding may cause thermal damage to t he resin bond diamond wheel, thereby resulting in low quality workpiece surface.

关键词： ceramic vertical grinding grinding force gr inding energy grinding temperature

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RuCl_3·3H_2. Mediated Olefin Isomerizations in Ionic Liquids: A Highly Recyclable System for Olefin Isomerizations

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chemical Research in Chinese universities 2012年第1期28卷 67-69页

作者： SHAO Ming-bo1, LIU Gui-yan2. ZHAO Jing-jing1, WANG Xiao-yu1 and WANG Jian-hui1 1. Department of Chemistry, college of Science, tianjin univer.ity, {2. 300072. P. R. china 2. {2. Key Laboratory of Structure and Performance for Functional Molecule, college of Chemistry, {2. Normal univer.ity, {2. 300387, P. R. china Department of Chemistry College of Science Tianjin University Tianjin 300072 college of Chemistry Tianjin Normal University Tianjin Key Laboratory of Structure and Performance for Functional Molecule Tianjin 300387

Herein lies a convenient and highly efficient method of olefin isomerization in the presence of RuCl3？3H2. in ionic liquid（IL）. More importantly, RuCl3？3H2. is a robust and recyclable catalyst. Nine cycles of RuCl... 详细信息

关键词： Ruthenium trichloride Ionic liquid Olefin isomerization

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Electrodeposition and Characterization of Polyaniline Film

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chemical Research in Chinese universities 2012年第1期28卷 133-136页

作者： WANG Hong-zhi, ZHANG Peng, ZHANG Wei-guo and YAO Su-wei Shanshan Research Office of Surface Technology, college of chemical Engineering,{2., tianjin 300072. P. R. china Shanshan Research Office of Surface Technology College of Chemical Engineering Tianjin University Tianjin 300072

Abstract Polyaniline film was prepared by electrochemical method in an acidic solution of aniline. The micromor- phology of the polyaniline film was transformed to three-dimensional network structure instead of little particles while the deposition time was extended. The peak wavelength of the photoluminescence spectrum was 491 nm. The luminous intensity increased with the extension of deposition time, and so did the electrochemical activity.

关键词： Polyaniline Electrodeposition Photoluminescence Electrochemical activity

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Two-photon spectroscopic behaviors and photodynamic effect on the BEL-7402.cancer cells of the new chlorophyll photosensitizer

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Science china Chemistry 2008年第6期51卷 529-538页

作者： ZHAO PeiDe1,2.CHEN Ping1,TANG GuoQing1,LIU JinWei2.LIN Lie1,GUO Peng1,YU Qing2. YAO JianZhong3,MA DongMing4,ZHANG GuiLan1 & CHEN WenJu1 1 Key Laboratory of Optoelectronic Information Science and Technology,Ministry of Education,Institute of Modern Optics,Nankai univer.ity,tianjin 300071,{2. 2.Department of Physics,Hebei univer.ity of Technology,tianjin 300130,{2. 3 college of Pharmacy,Second Military Medical univer.ity,Shanghai 2.0433,{2. 4 tianjin college of the Traditional Chinese Medicine,tianjin 300193,{2. Key Laboratory of Optoelectronic Information Science and Technology Ministry of Education Institute of Modern Optics Nankai University Tianjin China Department of Physics Hebei University of Technology Tianjin China college of Pharmacy Second Military Medical University Shanghai China tianjin college of the Traditional Chinese Medicine Tianjin China

The spectroscopic properties of a new chlorophyll derivate photosensitizer (CDP) are studied under the excitation wavelengths at 800 and 400 nm using femtosecond pulses from a Ti: sapphire laser. The damaging effect of CDP on the BEL-7402.cancer cells is also investigated upon two-photon illumination at 800 nm. The normalized fluorescence spectra of CDP in tetrahydrofuran (THF) show that two-photon and one-photon spectra have the same distributions and the same emission bands (675 nm). The lifetimes of two- and one-photon induced fluorescence of this molecule are of the order of 5.0 ns. By comparing the data it is shown that there is some difference between the two lifetimes, but the difference is less than one nanosecond. The two-photon absorption cross section of the molecule is also measured at 800 nm and estimated as about σ'_2.≈ 31.5x10^(-50)cm^4·s·photon^(-1). The results of two-photon photodynamic therapy (TPPDT) tests show that CDP can kill all of the tested cancer cells according to the usual Eosine assessment. Our results indicate that the two-photon-induced photophysical, photochemical and photosensitizing processes of CDP may be basically similar to those of one-photon excitation. These behaviors of the sample suggest that one may find other possible methods to estimate some photosensitizers' effects in details such as their distribution in cells and the reactive targets of the sub-cellular parts of some tumor cells via two-photon excitation techniques.

关键词： photosensitizer chlorophyll derivate two-photon fluorescence two-photon absorption cross-section TPPDT BEL-7402 cell

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Influence of p-layer on the performance of n-i-p μc-Si:H thin film solar cells

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Science china(Physics,Mechanics & Astronomy) 2010年第11期53卷 2042-2046页

作者： YUAN YuJie 1,2.ZHANG KaiLiang 1,2.WEI Zhen 1,2.& GENG XinHua 3 1 college of Electronics Information Engineering,tianjin {2. of Technology,tianjin 300384,china 2.tianjin Key Laboratory of Film Electronic and Communication Devices,tianjin {2. of Technology,tianjin 300384,china 3 Institute of Photo-Electronics Thin Film Devices and Technique,Nankai {2.,tianjin 300071,china tianjin univer.ity of Technology College of Electronics Information Engineering Tianjin China (GRID:grid.265025.6) tianjin univer.ity of Technology Tianjin Key Laboratory of Film Electronic and Communication Devices Tianjin China (GRID:grid.265025.6) Nankai univer.ity Institute of Photo-Electronics Thin Film Devices and Technique Tianjin China (GRID:grid.216938.7) (ISNI:***)

The high pressure radio frequency plasma enhanced chemical vapor deposition (RF-PECVD) process was adopted to prepare the n-i-p microcrystalline silicon solar cells,the influence of p-type layers on the performance of the solar cells was investigated,and the optimum p layer suited to the n-i-p microcrystalline silicon solar cells was *** experimental results demonstrate that the performance of the solar cells can be highly affected by the structural and optical properties of the p-layers,and the performance of solar cells can be greatly improved by optimizing p *** have achieved an initial active-area efficiency of 8.17% (V oc =0.49 V,J sc =2..9 mA/cm 2.,FF=67%) for the μc-Si:H single-junction n-i-p solar cells and an initial active-area efficiency of 10.93% (V oc =1.31 V,J sc =13.09 mA/cm 2.,FF=64%) for the a-Si:H/μc-Si:H tandem n-i-p solar cells.

关键词： microcrystalline silicon solar cells quantum confinement effect p-type layers

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Solid-Liquid Equilibria of Succinic Acid in Cyclohexanone,Cyclohexanol and Their Mixed Solvents

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Transactions of tianjin univer.ity 2007年第1期13卷 42-47页

作者：樊丽华马沛生宋微微 School of chemical Engineering and Technology Tianjin University

Solubilities were measured for succinic acid dissolved in cyclohexanone, cyclohexanol and 5 of their mixed solvents at the temperature range from 2.1. 85 K to 358.37 K using a dynamic method. The solubility data were regressed by λh equation, with,the average absolute relative deviation 3.47%. The binary interaction parameter is 0.306 7 for the mixed solvent of oyolohexanone and cyclohexanol was determined by correlating the experimental solubilities with the modified λh equation. When the binary interaction parameter was determined it can be used to extrapolate the solubilities of succinic acid in mixed solvents of cyclohexanone and cyclohexanol at any *** average absolute relative deviation was 7. 69% by using the modified λh equation to correlate the solubility data, however, the average absolute relative deviation was 8.89% by using NRTL equation to correlate the solubility data. The results show that the accuracy of the modified λh equation is better than that of the NRTL equation for the solubility of succinic acid in the 5 mixed solvents of cyclohexanone and cyclohexanol.

关键词： solid-liquid equilibrium solubility correlation succinic acid cyclohexanone cyclohexanol mixed solvents

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Catalytic Oxidation of Cyclohexene to Adipic Acid with a Reaction-Controlled Phase-Transfer Catalyst

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催化学报 2003年第7期24卷 483-484页

作者： GUO Minglin (college of Materials and chemical Engineering, {2. Polytechnic univer.ity, {2. 300160, china) college of Materials and chemical Engineering Tianjin Polytechnic University 天津 300160

The goal of modern organic synthesis is to develop efficient catalytic methods to produce desired compounds in a cost-effective and environmentally benign manner. Hydrogen peroxide is a highly attractive oxidant because it is a cheap, mild and environmentally friendly reagent with a high content of active oxygen, and water is the only by-product. However, oxygen transfer from hydrogen peroxide to the substrate normally requires catalysts. The development of a process for the selective oxidation of cyclohexene to adipic acid with hydrogen peroxide has attracted the attention of many chemists. In 1998, Sato and coworkers reported the oxidation of cyclohexene to adipic acid using sodium tungstate and methyltrioctylammonium hydrogensulfate as catalysts. In 1999, Deng and co-workers reported the synthesis of adipic acid from cyclohexene with 30% hydrogen peroxide in the presence of a novel peroxytungstateorgnaic complex catalyst.

关键词：催化氧化反应环己烯脂肪酸反应控制相转移催化剂癸钨酸盐十二钨磷酸盐有机合成

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锰铈混和氧化物气凝胶催化剂的研究

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燃料化学学报 2004年第1期32卷 93-97页

作者：孙海龙刘源刘少文天津大学材料科学与工程学院天津300072 天津大学化工学院天津300072

采用溶胶凝胶法和超临界干燥技术制备出CeO2.Ce1 xMnxO2.x分别为0 05,0 10,0 15,0 2.)气凝胶。以硝酸锰浸渍制得的氧化铈气凝胶Mn/CeO2.用TEM、BET、一氧化碳催化氧化活性评价和H2.TPR对所制备的催化剂进行了研究。TEM、BET的结果表明... 详细信息

采用溶胶凝胶法和超临界干燥技术制备出CeO2.Ce1 xMnxO2.x分别为0 05,0 10,0 15,0 2.)气凝胶。以硝酸锰浸渍制得的氧化铈气凝胶Mn/CeO2.用TEM、BET、一氧化碳催化氧化活性评价和H2.TPR对所制备的催化剂进行了研究。TEM、BET的结果表明,随着锰含量的增加,氧化铈气凝胶的粒度减小,表面积增大。一氧化碳催化氧化活性评价显示,氧化铈中添加锰制得的催化剂的一氧化碳低温催化氧化的活性比未添加锰的氧化铈提高。且锰加入量为15mol%时,气凝胶的催化活性最高。锰的引入方式不同,气凝胶的催化活性不同。浸渍方式负载锰所制备的Mn/CeO2.凝胶的一氧化碳催化氧化活性低于Ce1 xMnxO2.x分别为0,0 05,0 10,0 15,0 2.)气凝胶。TPR实验发现,与氧化锰相同,氧化铈上负载的锰的还原也分三步进行。

关键词：氧化铈气凝胶氧化锰一氧化碳氧化 TPR

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Preparation and Selectivity of Molecularly Imprinted Polymer Coating on the Micro Pore Membrane of Polytetrafluoroethylene

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Chinese chemical Letters 2003年第9期14卷 979-982页

作者： Hong Sheng GUO, Yu Mei JIA, Xi Wen HEState Key Laboratory of Functional Polymer Materials for Adsorption and Separation,Department of Chemistry, Nankai univer.ity, tianjin 300071 The {2. of Pharmaceuticals and Biotechnology, tianjin univer.ity, tianjin 300072 State Laboratory of Functional Polymer Materials for Adsorption and Separation Department of Chemistry Nankai University The college of Pharmaceuticals and Biotechnology Tianjin University

In order to obtain mechanically stable membrane for practical application, the imprinted polymer was synthesized in the pores of polyfluoromembrane, the binding and transport ability of the membrane were studied.

关键词： Molecular imprinting trimethoprim membrane of polytetrafluoroethylene.

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