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Synthesis and in vitro-Anti-hepatitis B Virus Activities of Several Ethyl 5-Hydroxy-1H-indole-3-carboxylates

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Chemical Research in Chinese Universities 2006年第5期22卷 577-583页

作者： ZHAO chun-shen ZHAO Yan-fang CHAI Hui-fang GONG Ping Liaoning Province Key Laboratory of Innovative Medicine Research and Design Shenyang Pharmaceutical University Shenyang 110016 P. R. China

A series of ethyl 5-hydroxyindole-3-earboxylates 6a-10r was designed and synthesized. The structures of all the compounds were confirmed by IR, ^1H NMR, and MS and their anti-hepatitis B virus （HBV） activities were evaluated in 2.2.15 cells. Among them, compound 7g { ethyl 5-hydroxy-2- [ （ 3-methoxyphenylsulfinyl ） methyl ] -1-methyl-4- [ （4-methylpiperazin-1-yl） methyl ]-1H-indole-3-carboxylate} displays a significant anti-HBV activity, which is more potent than the positive control lamivudine.

关键词： Ethyl 5-hydroxy-1H-indole-3-carboxylates Synthesis Anti-hepatitis B virus activity

2-Ethyl-9,10-anthraquinone assisted sol–gel synthesis of Pd/γ-Al2O3 nanorods with enhanced catalytic performance in 2-ethyl-9,10-anthraquinone hydrogenation

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Chinese Journal of Chemical Engineering 2019年第8期27卷 1863-1869页

作者： Weiquan cai Junlin Zhuo Jimin fang Zhichao Yang School of Chemistry and Chemical Engineering Guangzhou University230 Guangzhou University City Outer Ring RoadGuangzhou 510006China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China

A series of nanorod-like porous Pd/γ-Al2 O3 catalysts with controllable textural properties and enhanced catalytic performance in 2-ethyl-9,10-anthraquinone(eAQ) hydrogenation for H2 O2 preparation were successfully prepared via a facile sol-gel method using aluminum isopropoxide as aluminum precursor and eAQ as structure directing agent,sequential calcination and impregnation process with Na2 PdCl4 *** physicochemical properties of the catalysts obtained with different addition amounts of *** comparatively characterized by XRD,TG-DSC,BET,TEM,CO-TPR,H2-TPR and H2-O2 *** results show that addition of eAQ can not only effectively control the textural properties(surface area,pore volume and average pore size) of the catalysts,but also lower their reduction temperature of active ***,the catalyst obtained with an addition amount of 4 wt% eAQ shows the highest hydrogenation efficiency of 10.28 g·L^-1,which is 37.3% higher than 7.49 g·L^-1 of the catalyst obtained without eAQ.

关键词： Catalyst Hydrogenation Alumina 2-Ethyl-9,10-anthraquinone Structure directing agent H2O2

Global Stability for a Heroin Model with Age-Dependent Susceptibility

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Journal of Systems Science & Complexity 2015年第6期28卷 1243-1257页

作者： fang Bin LI Xuezhi MARTCHEVA Maia cai Liming Department of Mathematics Xinyang Normal University Beijing Institute of Information and Control Department of Mathematics University of Florida

This paper considers global asymptotic properties for an age-structured model of heroin use based on the principles of mathematical epidemiology where the incidence rate depends on the age of susceptible individuals. The basic reproduction number of the heroin spread is obtained. It completely determines the stability of equilibria. By using the direct Lyapunov method with Volterra type Lyapunov function, the authors show that the drug-free equilibrium is globally asymptotically stable if the basic reproduction number is less than one, and the unique drug spread equilibrium is globally asymptotically stable if the basic reproduction number is greater than one.

关键词： Age-structured basic reproduction number equilibrium global stability heroin model

Partial Isometries and an Invariant of C＊-algebras

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Acta Mathematica Sinica,English Series 2011年第4期27卷 799-806页

作者： Hong Liang YAO Xiao chun fang School of Science Nanjing University of Science and Technology Nanjing 210014 P. R. China Department of Mathematics Tongji University Shanghai 200092 P. R. China

In this paper, we will discuss some properties of biprojection-commutative elements which are relevant to the classification of certain infinite C＊-algebras,, and define an important invariant s（A） of C＊-algebra A as well as give some basic properties with regard to s（A）. Moreover we prove that the invariant s（A） has continuity.

关键词： Partial isometry C*-algebra K1-group

Lifting Unitary Elements with Application to Approximately Inner Automorphisms

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Acta Mathematica Sinica,English Series 2007年第10期23卷 1745-1750页

作者： Xiao chun fang Shu Dong LIU Department of Mathematics Tongji University Shanghai 200092 P. R. China Department of Mathematics Qufu Normal University Qufu 273165 P. R. CHina

Let A be a separable unital nuclear simple C＊-algebra with torsion K0 （A）, free K1 （A） and with the UCT. Let T ： A→M（K）/K be a unital homomorphism. We prove that every unitary element in the commutant of T（A） is an exponent, thus it is liftable. We also prove that each automorphism α on E with α ∈ Aut0（A） is approximately inner, where E is a unital essential extension of A by K and α is the automorphism on A induced by α.

关键词： C*-algebra extension automorphism

The α-comparison Property and Finite Nuclear Dimension of Generalized Inductive Limits for C~*-algebras

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Acta Mathematica Sinica,English Series 2018年第9期34卷 1417-1428页

作者： Yue Liang LIANG Xiao chun fang School of Science North University of China Taiyuan 030051 P. R. China Department of Mathematics Tongji University Shanghai 200092 P. R. China

The paper is devoted to the study of generalized inductive limit of C＊-algebras with coherent maps being completely positive contractions of order zero： the nuclear dimension of generalized inductive limit of C＊-algebras with finite nuclear dimension is finite; the generalized inductive limits of C＊-algebras with the α-comparison property also have the s-comparison property.

关键词： Finite nuclear dimension α-comparison property generalized inductive limit of C*-algebras

On Principal Invariant Subspaces

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Acta Mathematica Sinica,English Series 2015年第10期31卷 1621-1628页

作者： Xiao Ming XU Xiao chun fang School of Science Shanghai Institute of Technology Department of Mathematics Tongji University

Let F and G be closed subspaces of the complex Hilbert spaceH, and U and V be closed subspaces of F- and G, respectively. In this paper, using the technique of operator block, we present the necessary and sufficient conditions under which （U, V） is a pair of （strictly, non-degenerate） principal invariant subspaces for （F, G）.

关键词： Hilbert space operator matrix invariant subspace principal invariant subspace

A Class of C^(*)-Algebras with Non-stable K_1-Group Property

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Acta Mathematica Sinica,English Series 2012年第5期28卷 983-988页

作者： Qing Zhai FAN Xiao chun fang Department of Mathematics Shanghai Maritime University Department of Mathematics Tongji University

In this paper, we give a class of C＊-algebras with non-stable K1-group property which include the example non-simple tracial topological rank zero and stable rank two C＊-algebra given by Lin and Osaka.

关键词： C*-Algebras stable rank non-stable

Microstructure and Precipitation Behavior in HAZ of V and Ti Microalloyed Steel

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Journal of Iron and Steel Research International 2009年第3期16卷 68-72,77页

作者： fang fang YONG Qi-long YANG cai-fu SU Hang China Iron and Steel Research Institute Group Beijing 100081 China

Three steels containing 0.05%C-0.1%V-0.01%N （steel V-LN）,0.05%C-0.1%V-0.02%N （steel V-HN）,and 0.05%C-0.1%V-0.02%N-0.01%Ti （steel V-HN-Ti）,which were all essentially vanadium microalloyed steels,were subjected to simulating the microstructure of a coarse grained heat affected zone （CGHAZ）. The process involved reheating to 1 350 ℃,rapid cooling to room temperature,and varying the welding heat input from 15 kJ/cm to 54 kJ/cm,including four cooling rates of t8/5 equal to 7.5 s,20 s,40 s,100 s,and the relationship of heat input to t8/5 was calculated by Quiksim software. The microstructure and precipitation of vanadium and titanium carbon nitrides are studied. The results indicate that the microstructure consists of granular bainite and some side plate ferrite in the grain boundary when the steels are produced with the highest heat input. As the heat input decreased,numerous polygonal ferrites and grain boundary ferrites appeared,and the size apparently increased. When the steel contained high nitrogen,it was considerably easier to form martensite-austenite island,which was even worse for the toughness and other properties of the steel. For the limitation of cooling time,vanadium carbon nitrides could not precipitate sufficiently,but as titanium was added,the unmelted or precipitated TiN on cooling absorbed some fraction of nitrogen in the matrix and made more precipitate positions for the round V（C,N）,and thus several useful round particles could be seen in titanium-contained steel,and most of them were around TiN. By this experiment,we can conclude that with the help of titanium,nitrogen-enhanced steel had a better prior austenite grain size,was considerably easier to precipitate,reduced free nitrogen in the matrix effectively,and provided a very effective mechanism for restriction grain growth in the HAZ.

关键词： precipitate weld input toughness nitrogen