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Design of policy mechanism to promote cleaner production in china

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Journal of Environmental Sciences 2001年第3期13卷 346-350页

作者： ZHANG Tian zhu(dep.r.ment of Environmental Science and Engineering, tsinghua university, beijing 100084, china. dep.r.ment of Environmental Science and Engineering Tsinghua University Beijing 100084 China. zhangtz@***

In order to promote cleaner production in china, a package of policy options was presented based on the identification of the barriers encountered in the CP demonstration project and the effectiveness and feasibility of policy options for the CP implementation were analyzed. Furthermore, the policy mechanism framework was given, which composes of compulsory, economic incentive, social pressure and supportive function. Finally, the implementation strategy of the policy mechanism, in which the emphasis will be changed from compulsory policy options towards economic and social pressure policy options, was proposed.

关键词： cleaner production barrier identification policy mechanism china

ENTrOPY,INFOrMATION,NOISE-STUDIES ON SYSTEM EVOLUTION

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Systems Science and Systems Engineering 2003年第1期12卷 2-12页

作者： Weimin ZHENGSchool of Economics and Management tsinghua university. beijing 100084, china School of Economics and Management Tsinghua University

Universe, ecosystem, social system, etc. are evolving systems. The evolving processes of these systems have gradual small changes and rapid drastic changes with uncertainties under the constraints of environment. Systems, as a whole, are evolving toward complexity, diversity and variety with fluctuations and jumps. New order emerges from 'mutations'. The evolution is both chance-dependent and path-dependent. In this paper three basics: entropy, information and noise are emphasized with regard to system evolution which is a field that can give people wisdom to solve system problems with domain knowledge.

关键词： Entropy information noise

Electronic properties of multi-defected zigzag carbon nanotubes

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Science china(Physics,Mechanics & Astronomy) 2010年第1期53卷 11-15页

作者： QIAN HaiYun& ZHOU Taodep.r.ment of Physics, tsinghua university, beijing 100084, china 1. dep.r.ment of Physics Tsinghua University Beijing 100084 China

Electronic properties of multi-defected zigzag single-walled carbon nanotubes are investigated by use of the tight-binding Green's function method. The Stone-Wales defects and the vacancies are considered. We find that the conductance sensitively depends on the realistic defect configurations for the metallic zigzag carbon nanotubes. Interestingly, the electronic transport properties of the nanotubes with three vacancies can be considered as the sum effect of two double-vacancies, while those with Stone-Wales defects can not. The electron interference along the longitudinal axis and the transport blocking are observed, which may be useful for understanding the electron transport behavior of carbon nanotube in experiments.

关键词： electronic transport multi-defected carbon nanotube defect configuration electron interference transport blocking

|m| Partial wave treatment for two-dimensional Coulomb-scattering and regge pole

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Science china(Physics,Mechanics & Astronomy) 2004年第6期47卷 676-684页

作者： WANG Jing & ZENG Jinyan dep.r.ment of Physics,tsinghua university,beijing 100084,china School of Physics,Peking university,beijing 100871,china dep.r.ment of Physics Tsinghua University Beijing 100084 China School of Physics Peking University Beijing 100871 China

The symmetry and |m| partial-wave analysis for two-dimensional (2D) Coulomb-scattering is investigated. As a function of energyE, the |m| partial-wave scattering amplitudef |m|(θ) is analytically continuated to the, negativeE (complexk) plane, and it is found that the bound state energy eigenvalues (Ere just located at the poles off |m|(θ) on the positive imaginaryk axis as is expected. In addition, as a function of |m|,f |m|(θ) is analytically continuated to the complex |m| plane, the bound state energy eigenvalues are just located at the poles off |m|(θ) on the positive real |m| axis.

关键词： two-dimensional Coulomb scattering, |m| partial-wave, regge pole.

Application　of　a　Double－Wollaston－prism　Laser　Differential　Interferometer　in　Plasma　Focus

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Chinese Journal of Lasers 1996年第5期B5卷 461-466页

作者： LU Mingfang YANG Tsinchi HAN Min (tsinghua university, beijing 100084, china) tsinghua Univ Beijing China

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ＡｐｐｌｉｃａｔｉｏｎｏｆａＤｏｕｂｌｅ－Ｗｏｌｌａｓｔｏｎ－ｐｒｉｓｍＬａｓｅｒＤｉｆｆｅｒｅｎｔｉａｌＩｎｔｅｒｆｅｒｏｍｅｔｅｒｉｎＰｌａｓｍａＦｏｃｕｓＬＵＭｉｎｇｆａｎｇ；ＹＡＮＧＴｓｉｎｃｈｉ；ＨＡＮＭｉｎ（ＴｓｉｎｇｈｕａＵｎｉｖｅｒｓ...

关键词： laser differential interferometry plasma focus

On mean curvatures in submanifolds geometry

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Science china Mathematics 2008年第6期51卷 1127-1134页

作者： GE JianQuan dep.r.ment of Mathematical Sciences,tsinghua university,beijing 100084,china dep.r.ment of Mathematical Sciences Tsinghua University Beijing 100084 China

By using moving frame theory,first we introduce 2p-th mean curvatures and(2p+1)-th mean curvature vector fields for a *** then give an integral expression of them that characterizes them as mean values of symmetric functions of principle *** we apply it to derive directly the celebrated Weyl-Gray tube formula in terms of integrals of the 2p-th mean curvatures and some Minkowski-type integral formulas.

关键词： moving frame mean curvature tube 53A07 53C42

On fixed-points and singular values of transcendental meromorphic functions

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Science china Mathematics 2010年第3期53卷 887-894页

作者： ZHENG JianHua dep.r.ment of Mathematical Sciences, tsinghua university, beijing 100084, china 1. dep.r.ment of Mathematical Sciences Tsinghua University Beijing 100084 China

In this paper we make a further discussion of a relationship between the number of fixed-points and distribution of singular values along the round annuli centered at the origin of a transcendental meromorphic function. To attain our purpose we first establish a fundamental inequality for the modulus of derivative of a holomorphic covering mapping whose image is an annulus by virtue of the hyperbolic metric. The inequality is of independent significance. We make a simple survey on some domain constants for hyperbolic domains.

关键词： meromorphic functions fixed points singular points hyperbolic metric covering mapping

Fabrication of Grain-oriented (Bi,Pb)_2Sr_2Ca_2Cu_3O_x Superconducting Tapes Using Magnetic Field and Vibration Technique

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Journal of Materials Science & Technology 1998年第1期14卷 86-88页

作者： Yanwei MA and Xianjin WANG (dept. of Metal Forming, university of Science and Technology beijing, beijing 100083, china)Zutang WANG (tsinghua university, beijing 100084, china) Univ Sci & Technol beijing Dept Met Forming Beijing 100083 Peoples R China Tsing Hua Univ Beijing 100084 Peoples R China

Highly textured (Bi,Pb)2Sr2Ca2Cu3Ox superconducting tapes have been fabricated by means of magnetic-field and vibration technique. This method is an effective way of improving the degree of grain alignment and density of oxide core in tapes after heat treatment and pressing *** of above 20% was increased than that without treatment.

关键词： Bi,Pb Pb Sr Fabrication of Grain-oriented x Superconducting Tapes Using Magnetic Field and Vibration Technique Ca Cu

FL-FN-MOGA Based Traffic Signal Control

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Journal of Systems Engineering and Electronics 2003年第3期14卷 14-23页

作者： Wei Wu & Zhang Yi dep.r.ment of Automation, tsinghua university, beijing 100084, P. r. china dep.r.ment of Automation Tsinghua University Beijing 100084 P. R. China

In this paper, a traffic signal control method based on fuzzy logic (FL), fuzzy-neuro (FN) and multi-objective genetic algorithms (MOGA) for an isolated four-approach intersection with through and left-turning movements is presented. This method has an adaptive signal timing ability, and can make adjustments to signal timing in response to observed *** 'urgency degree' term, which can describe the different user's demand for green time is used in decision-making by which strategy of signal timing can be determined. Using a fuzzy logic controller, we can determine whether to extend or terminate the current signal phase and select the sequences of phases. In this paper, a method based on fuzzy-neuro can be used to predict traffic parameters used in fuzzy logic controller. The feasibility of using a multi-objective genetic algorithm ( MOGA) to find a group of optimizing sets of parameters for fuzzy logic controller depending on different objects is also demonstrated. Simulation results show that the proposed methed is effecfive to adjust the signal timing in response to changing traffic conditions on a real-time basis, and the controller can produce lower vehicle delays and percentage of stopped vehicles than a traffic-actuated controller.

关键词： Traffic signal control Fuzzy logic Fuzzy-neuro Multi-objective genetic algorithms.