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A　CRYO－HYDROGEL　IMMOBILIZED　PROTEIN　ELECTRODE　FOR　DIRECT　ELECTRON　TRANSFER　OF　MYOGLOBIN

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Chinese Chemical Letters 1995年第5期6卷 421-424页

作者： niu, jj Guo, YZ Dong, SJ Chinese Acad Sci Changchun Inst Appl Chem Electroanalyt Chem Lab Changchun 130022 Peoples R China

The direct electron transfer process of horse heart myoglobin, which was immobilized into a new type of cryo-hydrogel membrane on a glassy carbon electrode surface, was studied and the characteristics of this cryo-hyd...

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Novel nanoporous palladium catalyst for electroreduction of hydrogen peroxide

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Rare Metals 2011年第4期30卷 332-336页

作者： YI Qingfeng niu Fengjuan School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 411201 China Key Laboratory of Theoretical Chemistry and Molecular Simulation （Ministry of Education of China） Hunan University of Science and Technology Xiangtan 411201 China

Titanium-supported nanoporous palladium catalyst （Pd/Ti） was prepared by a hydrothermal method using PdC12 as a precursor, ethylenediamine tetraacetic acid （EDTA） as a ligand, and formaldehyde as a reduction agent. Complex Pd-EDTA^2- is favorable for the formation of Pd particles with nanoscale sizes. The electroactivity of the Pd/Ti catalyst towards the electroreduction of hydrogen peroxide in 1 mol/L NaOH solution was evaluated by voltammetric techniques. Both linear scan voltammetric and chronoamperometric data present significantly large steady-state reduction current density of the hydrogen peroxide electroreduction on the prepared Pd/Ti catalyst. The results show that the prepared Pd/Ti catalyst is an effective electrocatalyst for the electroreduction of hydrogen peroxide in alkaline media.

关键词： electrocatalysis nanoporous materials palladium hydrogen peroxide fuel cells

Time-Free Solution to 3-Coloring Problem Using Tissue P Systems

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Chinese Journal of Electronics 2016年第3期25卷 407-412页

作者： niu Yunyun XIAO Jianhua JIANG Yun School of Information Engineering China University of Geosciences in Beijing The Research Center of Logistics Nankai University School of Computer Science and Information Engineering Chongqing Technology and Business University

In most of traditional P systems, each rule has the same execution time. That way of using the rules is not quite realistic from a biological point of view, because external conditions always change in an unpredicted manner such that different reaction may take different time to execute. In this work, we investigate the computation efficiency of tissue P systems by removing the restriction that each rule should complete in one time unit. The timed tissue P system is constructed by adding a time mapping to the rules to specify the execution time for each rule.A uniform and time-free solution to 3-coloring problem is proposed, where the execution time of the computational processes involved can vary arbitrarily and the output produced is always the same.

关键词： Membrane computing Tissue P system Time-free solution 3-Coloring problem

An Enzyme Electrode Based on the Covalently Binding of Horseradish Peroxidase to a Self-assembling Monolayer Modified Gold Electrode

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Chinese Chemical Letters 1998年第2期9卷 157-160页

作者： Sun, jj Xu, jj Fang, HQ Chen, HY Nanjing Univ State Key Lab Coordinat Chem Dept Chem Nanjing 210093 Peoples R China

A new procedure for developing high performance enzyme electrode is described. The procedure is based on the covalently binding of horseradish peroxidase to a self-assembling monolayer on a gold electrode. An enhanced catalytic current is observed with addition of hydrogen peroxide into phosphate buffer solution (PBS) in the presence of mediators. The electrode exhibits high sensitivity and a wide linear range to hydrogen peroxide.

关键词： high performance enzyme electrode high sensitivity wide linear range

Spacecraft rendezvous trajectory safety quantitative performance index eliminating probability dilution

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Science China(Technological Sciences) 2014年第6期57卷 1219-1228页

作者： SUN ZhenJiang LUO YaZhong niu ZhiYong College of Aerospace Science and Engineering National University of Defense Technology

In view of the probability dilution problem of the existing quantitative indexes of rendezvous trajectory safety performance using collision probability,this paper proposes a new quantitative index of rendezvous trajectory safety performance by well combining collision probability with warning *** proposed new index increases monotonously as the position errors of the chaser spacecraft increase,therefore it can effectively overcome the problems of the reduction in the largest performance value and the advancement in the most dangerous time induced by the probability *** proposed new index is applied to the safety design of close range rendezvous *** mission’s safety requirements for initial navigation precision and the safe region of initial and final keeping points’positions with a certain navigation precision are analyzed,and several valuable conclusions about the relation between position navigation precision and velocity navigation precision as well as the relation between keeping points’positions and navigation precision are obtained.

关键词： rendezvous and docking safety performance probability dilution missing alarm probability

Persistent Currents in Toroidal Single-wall Carbon Nanotubes

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Journal of Materials Science & Technology 1999年第4期15卷 342-344页

作者： Liu, jj Zhang, G Gu, BL Tsing Hua Univ Dept Phys Beijing 100084 Peoples R China

In this paper the persistent currents of ideal toroidal single-wall carbon nanotubes (TSWNTs) are calculated from the tight-binding model and the periodic boundary conditions. The electronic structure and persistent current of a TSWNT strongly depend on its helicity and longitudinal circumference, making the TSWNTs a geometry-sensitive kind of materials. The interatomic carbonic interactions other than pp pi-type are also studied and are found to introduce more steps to the persistent current. The diamagnetic-paramagnetic transitions occur more frequently, and the persistent current depends on the interaction energy values, while the periodicity of magnetic flux preserves.

关键词： Nanotubes

Effects of Charge Inheritance on High Zn-Al Based Alloy

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Journal of Materials Science & Technology 1995年第2期11卷 153-156页

作者： GENG, H MA, jj YANG, SH Shandong Polytechnic Univ Jinan China

The effects of several kinds of charges on microstructure and mechanical properties of ZA27 zinc alloy have been studied. Experimental results show that a certain amount of the mechining charge, granular charge and remelting charge treated in suitable way can increase greatly the mechanical properties of ZA27 alloy. It is thought that the charges possess microstructure inheritance to ZA27 alloy, so cause the property changes according to the viewpoints of casting alloy inheritance.

关键词： Zinc alloys

Indications for 5-aminosalicylate in inflammatory bowel disease:Is the body of evidence complete?

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World Journal of Gastroenterology 2006年第38期12卷 6115-6123页

作者： Ad A van Bodegraven Chris jj Mulder Section of Inflammatory Bowel Diseases VU University medical centre Amsterdam The Netherlands Department of Gastroenterology VU University medical centre Amsterdam The Netherlands

Mesalazine is a safe drug, although adverse events may be seen in a minority of patients. This applies also to pregnant women and children. The role of mesalazine in combination therapy to improve efficacy and con- comitant drug pharmacokinetics, or in chemoprevention against inflammatory bowel disease (IBD)-related co- lonic carcinoma has not yet been completely elucidated. Therapeutic success of mesalazine may be optimized by a combination of high dose and low frequency of dos- age to improve compliance. Therefore, due to its supe- rior safety profile and pharmacokinetic characteristics, mesalazine is preferable to sulphasalazine. This paper reviews the literature concerning mechanisms of action, indications and off-label use, pharmacokinetic properties and formulations, therapeutic efficacy, compliance, pae- diatric indications, chemoprevention, and safety issues and adverse event profile of mesalazine treatment versus sulphasalazine. It also highlights these controversies in order to clarify the potential benefits of mesalazines in IBD therapy and evidence for its use.

关键词： Mesalazine Sulphasalazine Review Ulcerative colitis Crohn's disease Treatment Chemoprevention Pregnancy Adverse events

Existence of periodic solutions for Lienard equations with finite delay

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Chinese Science Bulletin 1997年第14期42卷 1145-1149页

作者： Wei, jj Huang, QC Department of Mathematics Northeast Normal University Changchun China

THE existence of periodic solutions of Lienard equation with finite delay x(t) + f(x(t))x(t) + g(x(t-r))=0 (1)has been studied extensively. However, most works we have so far require the assumption thatx·g(x)>0 for a... 详细信息

关键词： delay Lienard equations bifurcations periodic solutions.