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Effects of cosolvent on formation and morphology of microspheres in precipitation polymerization of divinylbenzene in supercritical carbon dioxide

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Chinese Chemical Letters 2011年第4期22卷 489-492页

作者： Chun Sheng LiJing Cui Liang Xiao Li Zhu xiang zheng Kong Key Laboratory of Fluorine Chemistry and Chemical Materials of Shandong Province College of Chemistry and Chemical Engineering University of Jinan Jinan 250022 China

Precipitation polymerizations of divinylbenzene（DVB） in pure supercritical carbon dioxide,and parallel runs with presence of a cosolvent were carried *** results showed that use of acetone as the cosolvent contributed greatly to the formation of the monodisperse *** microspheres,with obviously higher uniformity than reported up to date,were achieved using 6-7 mL of acetone in a reactor of 50 mL with DVB concentration of 0.4 mol/L under 16 MPa,a much lower pressure than previously reported without use of cosolvent.

关键词： Polydivinylbenzene microspheres Precipitation polymerization Supercritical carbon dioxide Cosolvent

A novel associative latex thickener using ethoxylated behenyl methacrylate as functional monomer

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Chinese Chemical Letters 2010年第5期21卷 616-619页

作者： xiang zheng Kong Chen Wang Xu Bao Jiang Xiao Li Zhu College of Chemistry and Chemical Engineering University of JinanJinan 250022China

Alkali-soluble associative latex thickeners modified with hydrophobic long chain alkyl groups were prepared using common acrylics and varying amount of a functional monomer,ethoxylated behenyl methacrylate(BEM),through emulsion *** was found that the size of the emulsion particle became larger with addition of *** light transmittance of the thickener latex sharply increased with pH varied from 6 to *** associative latex thickener manifested a higher viscosity when solids in the latex thickeners were kept at 0.5 wt%or higher,and the optimal amount of BEM was found to be around 2.5 wt%,or 0.16 mol%.All thickener latexes modified with BEM have better shearing resistance than the BEM-free thickener.

关键词： Associative thickener Functional monomer Ethoxylated behenyl methacrylate Viscosity

Study on Hydrogen Environment Fatigue Test System and Correlative Fatigue Test of Hydrogen Storage Vessel

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Journal of Harbin Institute of Technology(New Series) 2013年第1期20卷 81-86页

作者： Wei-Wei Zhou Chuan-xiang zheng Rong Li Liang Wang Institute of Chemical Machinery and Process Equipment Zhejiang University

A 70 MPa hydrogen environment fatigue test system has been designed and applied in the manufacture of a hydrogen storage vessel. The key equipment is a 80 MPa flat steel ribbon wound high pressure hydrogen storage vessel. A reasonable stress distribution has been realized, which is low stress on the liner of the pressure vessel and even stress on the flat ribbon layers. This optimal stress distribution is achieved through the adjustment of the prestress in flat steel ribbons. A control system for the fatigue test system has also been designed. It consists of a double control model, manual control and automatic control, to satisfy different experiment requirements. The system is the only one which can be used in the real hydrogen environmental fatigue test system in China. An experiment for a 70 MPa onboard composite material hydrogen vessel has been carried out on the system. The experimental results from this test are in close agreement with the practical operating conditions.

关键词： hydrogen storage vessel fatigue hydrogen environment experiment

Applications of F-expansion to Periodic Wave Solutions for Variant Boussinesq Equations

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Communications in Theoretical Physics 2005年第3X期44卷 396-400页

作者： WANG Yue-Ming LI xiang-zheng YANG Sen WANG Ming-Liang Department of Mathematics and Physics Henan University of Science and Technology Luoyang 471003 China Department of Mathematics Lanzhou University Lanzhou 730000 China

We present an F-expansion method for finding periodic wave solutions of nonlinear evolution equations in mathematical physics, which can be thought of as a concentration of extended Jacobi elliptic function expansion method proposed recently. By using the F-expansion, without calculating Jacobi elliptic functions, we obtain simultaneously many periodic wave solutions expressed by various Jacobi elliptic functions for the variant Boussinesq equations. When the modulus m approaches 1 and O, the hyperbolic function solutions （including the solitary wave solutions） and trigonometric solutions are also given respectively.

关键词： F-expansion variant Boussinesq equations periodic wave solutions Jacobi elliptic functions solitary wave solutions

Scoring systems for prediction of mortality in decompensated liver cirrhosis: A meta-analysis of test accuracy

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World Journal of Clinical Cases 2018年第15期6卷 995-1006页

作者： Shi-Lan Wu Yi-xiang zheng zheng-Wen Tian Meng-Shi Chen Hong-Zhuan Tan Department of Epidemiology and Health Statistics Xiangya School of Public Health Central South University Department of Infectious Diseases Xiangya Hospital Central South University

AIM To compare the accuracy of the scoring systems ChildTurcotte-Pugh(CTP), Model for End-stage Liver Disease score(MELD), MELD-Na, and MELD to Serum Sodium ratio(MESO) to predict the mortality in decompensated liver *** The PubMed, Web of Science, Cochrane Library, EMBASE, and Ovid databases were systematically searched from inception to September 2018 for relevant articles, and we evaluated the quality of the included studies. The accuracy of scoring systems was analyzed with Stata 12 and MetaDiSc *** Sixteen studies involving 2337 patients were included. The pooled areas under the summary receiver operating characteristic curves(AUROCs) of CTP, MELD, MELD-Na, and MESO to predict mortality were 0.81,0.78, 0.85, and 0.86, respectively. Within 3 mo, the AUROCs of CTP, MELD, and MELD-Na in predicting mortality were 0.78, 0.76, and 0.89, respectively. The AUROCs of CTP, MELD, and MELD-Na at 3 mo were 0.86, 0.78, and 0.86, respectively. The AUROCs of CTP, MELD, and MELD-Na at 6 mo were 0.91, 0.83, and 0.90, respectively. The AUROCs of CTP, MELD, and MELDNa at 12 mo were 0.72, 0.75 and 0.84, respectively. In cirrhotic patients with bleeding, the AUROCs of CTP and MELD were 0.76 and 0.88, *** MESO has the highest AUROC in all assessed scoring systems. Considering the different time points, MELDNa has good accuracy in predicting the mortality of decompensated liver cirrhosis. Compared to CTP, MELD is better in predicting variceal bleeding.

关键词： Liver cirrhosis Decompensated Mortality Accuracy Meta-analysis

N,N-Di-isopropyl-O,O-Di-p-methoxybenzylphosphoramidite——A New Phosphorylating Reagent

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Chinese Chemical Letters 1999年第9期10卷 719-722页

作者： Shoichirol OZAKI Ai You HAO xiang zheng KONG Da Xing zheng(Department of Chemistry, Shandong University, Jinan 250100) Shandong Univ Dept Chem Jinan 250100 Peoples R China

A new phosphorylating reagent, N,N-di-isopropyl-O,O-di-p-methoxybenzylphosphoramidite was synthesized from diisopropylamino dichlorophosphine and p-methoxybenzyl alcohol for preparing phosphatydyl inositol polyphospha... 详细信息

关键词： N,N-di-isopropyl-O,O-di-p-methoxybenzylphosphoramidite phophorylating reagent unsaturated component

Squamous Cell Carcinoma of Small Intestine: a Case Report

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Chinese Medical Sciences Journal 2014年第4期29卷 239-241页

作者： Yi Bao zheng-xiang Zhong Ya-wei Yu Department of Oncology The Second Hospital of Jiaxing Department of Surgery The Second Hospital of Jiaxing Department of Pathology The Second Hospital of Jiaxing

NEOPLASMS derive from small intestine are rareand most cases are adenocarcinomas andcarcinoid.1 Squamous cell carcinoma of smallintestine is even rarer and only few casesreported in literature.1 In this article, we report a case of a68-year-old male who underwent a laparotomy due toperforation of the small intestine and was diagnosed withsquamous cell carcinoma of the small intestine.

关键词： squamous cell carcinoma small intestine perforation

Characterization and photocatalytic properties of silver and silver chloride doped TiO_2 hollow nanoparticles

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Chinese Chemical Letters 2012年第12期23卷 1399-1402页

作者： Ping Li Ji xiang zheng Kong Jin Gang Wang Xiao Li Zhu College of Chemistry and Chemical Engineering University of Jinan

Using polystyrene （PSt） particles as template, PSt/TiO2 composite particles with AgCl incorporation were prepared through hydrolysis of tetrabutyl titanate in the presence of AgNO3 and NaCl. AgCl doped TiO2 hollow particles were successfully prepared with the PSt/TiO2 composite microspheres pretreated at 180 ℃ followed by calcination. The morphology of PSt/TiO2 particles and the crystal structures of the AgCl doped TiO2 hollow particles were characterized. The photocatalytic activity of the doped TiO2 hollow particles in degradation of Rhodamine B was tested under UV and visible lights and compared to that with Ag doped TiO2 particles. The results showed that TiO2 hollow particles, either doped with Ag or AgCl, demonstrated higher photocatalytic activity than the pure TiO2 particles. This enhancement in photocatalytic activity was more significant with AgCl doped TiO2 than that with Ag doped, and more distinct when the degradation was done under visible light than that under UV light.

关键词： TiO2 hollow particles AgCl doping Photocatalysis Light absorption shifting Rhodamine B degradation

Effect of Sulfonation Degree on Performance of Proton Exchange Membranes for Direct Methanol Fuel Cells

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Chemical Research in Chinese Universities 2016年第2期32卷 291-295页

作者： xiang zheng ZHAO Xueping GE Junjie MA Shuhua ZHANG Yuwei NA Hui Alan G. MaeDiarmid Institute College of Chemistry Jilin University Changchun 130012 P. R. China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials School of Chemistry and Chemical Engineering University of Jinan Jinan 250022 P. R. China

A series of proton exchange membranes based on sulfonated polyarylene ether ketones（SPAEKs） was used to study the effect of sulfonation degree on proton conductivity, methanol permeation and performance of direct methanol fuel cells（DMFCs）. Dependences of physical characteristics of the membranes, i. e., proton conductivity, water uptake, swelling ratio, methanol permeability and ion exchange capacity（IEC） were systematically studied. Both methanol permeability and proton conductivity of the SPAEK membrane grow rapidly as the increase in sulfonation degree since methanol molecules and protons share the same transfer channel. However, the methanol permeability plays more important role comparing to proton conductivity. As a result, the SPAEK membrane with a medium sulfonation degree（60%） was found to yield the best performance in a DMFC due to the acquirement of balanced conductivity and methanol permeability.

关键词： Fuel cell Sulfonation degree Proton exchange membrane Methanol permeability