检索结果-南通市图书馆

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可持续发展的“关系”内涵透视

社会科学家 2000年第4期15卷 62-65页

作者：朱传耿南京大学城市与资源学系江苏南京210093

可持续发展是一个全新的概念 ,是当今世界的主流思想。我国党和政府已明确指出 ,在现代化建设中必须实施可持续发展战略。文章从宏观角度概括了可持续发展的人地、区际、国际、代际、和人际等五大关系内涵。

关键词：可持续发展人地关系区际关系国际关系

面向21世纪信息管理专业教育改革的认识与实践

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图书情报工作 2001年第9期45卷 84-87页

作者：罗辉陈雅南京大学信息管理系南京210093

分析传统图书馆学、情报学、档案学教育在信息时代面临的挑战和新形势下信息管理人才的培养模式、教学体系、课程设置,提出进一步深化改革的若干措施。

关键词： 21世纪信息管理专业教育教学改革培养模式教学体系课程设置

The Enhancement of Band Edge Emission from ZnS/Zn（OH）2 Quantum Dots

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The Enhancement of Band Edge Emission from ZnS/Zn（OH）2 Qua...

Design of Multiobjective Satisfactory PI Controllers for Second-Order Systems with Time Delay

第一届全国纳米技术与应用学术会议

作者： Hatim Mohamed El-Khair, Ling XU, Xinfan HUANG, Minghai LI and Kunji CHENNational Laboratory of Solid State Microstructures and department of physicsnanjing university, nanjing 210093, china

＜正＞ Wurtzite structure monodisperse ZnS quantum dots （QDs） of 1 to 5 nm diameters were synthesized by colloidal chemical method. The strong enhancement of the blue shifted band edge emission from Zn（OH）2 capped ZnS QDs has been observed which indicates the role of surface passivation and supports the quantum size effect. The mismatching of the solvent polarities for stabilizer and QDs precursors lead to detectable far red shifted emission from ZnS core QDs. This emission is attributed to the surface trap states of different energies.

关键词： ZnS QDs Surface passivation band-edge luminescence solvent polarity

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Design of Multiobjective Satisfactory PI Controllers for Sec...

On the Auslander-Reiten Quiver with OrientedCyclesof Representation-finite Algebras

第二十三届中国控制会议

作者： Li Yinya, Sheng Andong, Wang Yuangang (department of Automation, nanjing university of Science and Technology, Jiangsu nanjing, 210094, P. R, china)

A method on the design of multiobjective satisfactory PI controllers for second-order systems with time delay is proposed in this paper. The method is based on plotting stability boundary locus in the kp-ki plane. All stabilizing PI controllers parameters, which achieve the desired gain and phase margins, can be determined in the kp-ki plane. Performing a search on the entire compact closed stability region, PI controllers which satisfy the desired time-domain performance specifications can be fast calculated. More over, the necessary condition for the existence of a PI controller to simultaneously stabilize the open-loop unstable second-order time-delay systems is also derived. Examples are given to show the effectiveness of the method presented.

关键词： time delay system stabilization PI control multiobjective control gain and phase margins

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Chinese Quarterly Journal of mathematics 1998年第3期13卷 43-47,页

作者： Yao Hailou (department of mathematics,Beijing Polytechnic university,Beijing,100022)

Let A be a basic,connected finite dimensional algebra over an algebraically closed field with finite representation type, α(A) be the maximum of set consisting of numbers of indecomposable summands in the middle term of Auslander Reiten sequences in mod A. In this paper we show that if α(A)=1, then Γ A contains oriented cycles if and only if Γ A contains DT r periodic modules. When α(A)2 we give counterexamples to the assertion.

关键词： Auslander Reiten quiver Auslander Reiten sequences oriented cycles DT r periodic molules

STRONG CONVERSE INEQUALITY FOR SZASZ-DURRMEYER OPERATORS

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Applied mathematics(A Journal of Chinese Universities) 1996年第3期11卷 361-368页

作者： LI SONG(department of Applied mathematics,Zhejiang university, Hangzhou 310027.)

For Szasz-Durrmeyer operators L.(f,x),10,is Ditzian-Totik modulus of smoothness.

For Szasz-Durrmeyer operators L.(f,x),12=x,M>0,is Ditzian-Totik modulus of smoothness.

关键词： Szasz-Durrmeyer operators,strong converse inequality Ditzian-Totik modulus of smoothness.

Separation and Characterization of Chlorogenic Acids in Tobacco Materials using Liquid Chromatography and Negtive Electrospary Ionization Tandem Mass Spectrometry

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Separation and Characterization of Chlorogenic Acids in Toba...

Application of polynomial chaos on numerical simulation of stochastic cavity flow

2011 World Congress on Engineering and Technology(CET 2011)

作者： Shaofeng Li 1 1.Jiangsu Engineering and Technology Research Center for Microbiology Resource Jiangsu Key Laboratory for Biodiversity and Biotechnology College of Life Science nanjing Normal university nanjing china Yuru Chen 1 2 2.department of Biotechnology Taizhou College nanjing Normal university Taizhou china Kewei Dai 3 3.School of Geography Science nanjing Normal university nanjing china Shijie Yang 4 4.School of Life Science and Environment College of Yichun Yichun china

Methods for separation of chlorogenic acid in tobacco materials *** liquid chromatography-mass spectrometry （LC-MS） method for identification and analysis of chlorogenic acids from tobacco material has been *** acid （CQA） were isolated by polyamide column chromatography and further purified by silica gel column *** revealed that polyamide is suitable for separation chlorogenic acid from tobacco *** eluant was collected for two-step column chromatography of *** content of chlorogenic acid of the purified product was 40.3%.After further purification by silica gel column chromatography,the content of total chlorogenic acids was 92.2%.The LC-MS results showed that total chlorogenic acids were made up of four components: 5-CQA,3-CQA,4-CQA and *** content of 5-CQA was the most （78.2%） and other three chlorogenic acid derivatives were 1.9%,10.1% and 2.0% respectively.

关键词： tobacco chlorogenic acid polyamide separation liquid chromatography-mass spectrometry (LC-MS)

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Science china(Technological Sciences) 2010年第10期53卷 2853-2861页

作者： WANG XiaoDong1,2 & KANG Shun1 1 Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, School of Energy Power and Mechanical Engineering, North china Electric Power university, Beijing 102206, china 2 department of Mechanical Engineering, Vrije Universiteit Brussel, Brussels 1050, Belgium 1. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment Ministry of Education School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China2. Department of Mechanical Engineering Vrije Universiteit Brussel Brussels 1050 Belgium

In present paper,the mathematic background of intrusive polynomial chaos (IPC) method and coupling process with one dimension Euler equation were introduced. The IPC method was implemented for the 2D compressible stochastic Navier-Stokes equations to simulate the non-deterministic behavior of a lid driven cavity flow under the influence of uncertainties. The driven velocity and fluid viscosity were supposed respectively to be the uncertain variable which has Gaussian probability distribution. Based on the validation with benchmark results,discussions were mainly focused on the statistic properties of velocity distribution. The results indicated the effect of IPC method on the simulation of propagation of uncertainty in the flow field. For the simulated results of 2D cavity flow,influence of the driven velocity uncertainty is larger than that of viscosity.

关键词： non-deterministic polynomial chaos numerical simulation lid driven cavity flow

Existence and Uniquenes of Limit Cycles for a Polynomial System

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Communications in Mathematical Research 1999年第2期 57-61页

作者： Liu Deming (department of mathematics, Shenyang Normal university, Shenyang, 110031)

§１．ＩｎｔｒｏｄｕｃｔｉｏｎＦｏｒｔｈｅｆｏｌｏｗｉｎｇｐｏｌｙｎｏｍｉａｌｓｙｓｔｅｍｏｆｄｅｇｒｅｅｍ：ｄｘｄｔ＝ｆ１（ｘ，ｙ），ｄｙｄｔ＝ｆ２（ｘ，ｙ），（Ｅ）ｗｈｅｒｅｆ１（ｘ，ｙ）ａｎｄｆ２（ｘ，ｙ）ａｒ... 详细信息

§１．ＩｎｔｒｏｄｕｃｔｉｏｎＦｏｒｔｈｅｆｏｌｏｗｉｎｇｐｏｌｙｎｏｍｉａｌｓｙｓｔｅｍｏｆｄｅｇｒｅｅｍ：ｄｘｄｔ＝ｆ１（ｘ，ｙ），ｄｙｄｔ＝ｆ２（ｘ，ｙ），（Ｅ）ｗｈｅｒｅｆ１（ｘ，ｙ）ａｎｄｆ２（ｘ，ｙ）ａｒｅｐｏｌｙｎｏｍｉａｌｓｉｎｘａｎ...

关键词： Polynomial System Limit Cycle Existence and Uniqueness