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Search Results: 1 - 10 of 54587 matches for " SI Wei "
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Estimate on Performance Evaluation of China’s Central Enterprise Listed Company Based on the EVA  [PDF]
Si Zhang, Jianwei Deng, Wei Du
American Journal of Industrial and Business Management (AJIBM) , 2014, DOI: 10.4236/ajibm.2014.48048
Abstract:

Since China joined the WTO, the enterprises, especially central enterprises, have actively participated in the international competition. Assessing the results of the operations and the asset utilization has become a top priority. To provide new investment ideas for investors, this paper introduces the EVA to assess the results of operation.

Empirical Research on Scientific and Technical Innovation and Economic Growth in Shanghai  [PDF]
Lei Weng, Wei Song, Si-Bei Sheng
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.21009
Abstract: With the explosive growth of knowledge and the further improvement of economic globalization, technology gradually represents its greater significance as the core factor of the strategic resources and competence for national and regional development, which becomes a greater support to the construction of the innovative country and also a key to take the initiative to develop. Under this tendency, technological improvements should play a more important role in pushing the economy forwards, which brings higher requirements for technical development in Shanghai. Thus Shanghai must integrate and utilize the resources of new technology in a more comprehensive way. During the process of building up a well-off society as well as innovative regions in an all-around way, the demand for technological innovation is continuously increasing and its content, as to Shanghai, is undergoing further fulfillment. The study on the inner connection between Shanghai technological development and economic growth, thus under such background, means much to get a knowledge about the dynamic equilibrium relationship between technical progress and economic growth, which can be taken as an important reference for the government to draw up the plan for future technological development.
The Development of PCB Enterprise Sewage Monitoring and Management and Controlling Systems  [PDF]
Yue-xin Li, Ling Zhang, Si-wei Zhou
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.38093
Abstract: With the development of science and technology, more and more cities are confronted with the water pollution of various degrees. The article is devoted to the introduction of a secondary sewage monitoring and management system which can automatically check the content of different components in the sewage discharged by enterprises and supply data reports with the help of probes, SBCs, PCs, etc. The article includes five parts. The first part introduces the research background, main research work and innovations of this system. The second part introduces the system architecture and system process. The third presents the fundamental working principles of SBCs and the relevant algorithms of PCs. The fourth expounds the problems and deficiencies which may exist in the algorithms. And the last part consists of summary and prospect, providing the possible solution to the deficiencies and looking forward to the future direction of research.
An Approach to the Developing Ways of Tribology in China
关于我国摩擦学发展方向的探讨

ZHANG Si,wei,
张嗣伟

摩擦学学报 , 2001,
Abstract: The current developing situation of Tribology is summarized based on an outlined analysis of the coverage, classification, and amounts of the academic papers presented in the three important international conferences on Tribology held since the new millennium. It is pointed out that the research subjects in the international tribological circles today are still friction, wear and lubrication, while most of the research work is closely combined with the industrial application background. Surface engineering, Micro and Nano tribology, Tribology in magnetic recording systems, Biotribology, and Ecological/Environmental Tribology have aroused more concern. Based on the above analyses, three developing ways of tribology in China in the coming years are put forward.
A New Kind of Deformed Hermite Polynomials and Its Applications
Si Cong Jing,Wei Min Yang
Physics , 2002,
Abstract: A new kind of deformed calculus was introduced recently in studying of parabosonic coordinate representation. Based on this deformed calculus, a new deformation of Hermite polynomials is proposed, its some properties such as generating function, orthonormality, differential and integral representaions, and recursion relations are also discussed in this paper. As its applications, we calculate explicit forms of parabose squeezed number states, derive a particularly simple subset of minimum uncertainty states for parabose amplitude-squared squeezing, and discuss their basic squeezing behaviours.
A New Kind of Graded Lie Algebra and Parastatistical Supersymmetry
Wei Min Yang,Si Cong Jing
Physics , 2002, DOI: 10.1007/BF02872276
Abstract: In this paper the usual $Z_2$ graded Lie algebra is generalized to a new form, which may be called $Z_{2,2}$ graded Lie algebra. It is shown that there exists close connections between the $Z_{2,2}$ graded Lie algebra and parastatistics, so the $Z_{2,2}$ can be used to study and analyse various symmetries and supersymmetries of the paraparticle systems.
Graded Lie Algebra Generating of Parastatistical Algebraic Structure
Wei Min Yang,Si Cong Jing
Physics , 2002,
Abstract: A new kind of graded Lie algebra (we call it $Z_{2,2}$ graded Lie algebra) is introduced as a framework for formulating parasupersymmetric theories. By choosing suitable bose subspace of the $Z_{2,2}$ graded Lie algebra and using relevant generalized Jacobi identities, we generate the whole algebraic structure of parastatistics.
Parabose Squeezed Operator and Its Applications
Wei Min Yang,Si Cong Jing
Physics , 2002,
Abstract: By virtue of the parabose squeezed operator, propagator of a parabose parametric amplifier, explicit form of parabose squeezed number states and normalization factors of excitation states on a parabose squeezed vacuum atate are calculated in this letter, which generalize the relevant results from ordinary Bose statistics to parabose case.
Space Structure for the Simplest Parasupersymmetric System
Wei Min Yang,Si Cong Jing
Physics , 2002,
Abstract: Structure of the state-vector space for a system consisting of one mode parabose and one mode parafermi degree of freedom with the same parastatistics order $p$ is studied and a complete, orthonormal set of basis vectors in this space is constructed. There is an intrinsic double degeneracy for state vectors with $m$ parabosons and $n$ parafermions, where $m \not= 0$, $n \not= 0$, and $n \not= p$. It is also shown that the degeneracy plays a key role in realization of exact supersymmetry for such a system.
Decoherence and Energy Relaxation in the Quantum-Classical Dynamics for Charge Transport in Organic Semiconducting Crystals: an Instantaneous Decoherence Correction Approach
Wei Si,Chang-Qin Wu
Physics , 2015, DOI: 10.1063/1.4926534
Abstract: We explore an instantaneous decoherence correction (IDC) approach for the decoherence and energy relaxation in the quantum-classical dynamics of charge transport in organic semiconducting crystals. These effects, originating from environmental fluctuations, are essential ingredients of the carrier dynamics. The IDC is carried out by measurement-like operations in the adiabatic representation. While decoherence is inherent in the IDC, energy relaxation is taken into account by considering the detailed balance through the introduction of energy-dependent reweighing factors, which could be either Boltzmann (IDC-BM) or Miller-Abrahams (IDC-MA) type. For a non-diagonal electron-phonon coupling model, it is shown that the IDC tends to enhance diffusion while energy relaxation weakens this enhancement. As expected, both the IDC-BM and IDC-MA achieve a near-equilibrium distribution at finite temperatures in the diffusion process, while the Ehrenfest dynamics renders system tending to infinite temperature limit. The resulting energy relaxation times with the two kinds of factors lie in different regimes and exhibit different dependence on temperature, decoherence time and electron-phonon coupling strength, due to different dominant relaxation process.
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