检索结果-南通市图书馆

A DIFFERENTIAL GAME MODEL FOR A DEVELOPING AND A DEVELOPED COUNTRY

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2009年第2期22卷 171-185页

作者： rong zhang Xuexiang HUANG College of Economics and Business Administration Chongqing University Chongqing 400030 China. Xuexiang HUANG School of Management Fudan University Shanghai 200433 China.

A differential game (DG) model for a developing and a developed country is *** player makes decisions about how much resource to be used to restrict the opponent's developmentso as to maximize his weighted sum of current consumption and final *** consumption isassumed to be preferred to final output for both *** developing country is assumed to havea higher economic growth rate and a higher preference to final output,whereas the developed countryis assumed to have a higher initial income and a higher efficiency in restricting his *** is investigated under three kinds of information structures,i.e.,a zerosum,a nonzero-sum,anda Stackelberg ***-loop equilibrium solutions are obtained for all the three *** of the result are provided.

关键词： Developed country developing country differential game Nash equilibrium.

Complex SAR Image Compression Using Entropy-Constrained Dictionary Learning and Universal Trellis Coded Quantization

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2016年第4期25卷 686-691页

作者： ZHAN Xin zhang rong Department of Electronic Engineering and Information Science University of Science and Technology of China Key Laboratory of Electromagnetic Space Information Chinese Academy of Sciences

In this paper,an Entropy-constrained dictionary learning algorithm(ECDLA) is introduced for efficient compression of Synthetic aperture radar(SAR) complex *** RI encodes the Real and imaginary parts of the images using ECDLA and sparse representation,and ECDLA AP encodes the Amplitude and phase parts *** compared with the compression method based on the traditional Dictionary learning algorithm(DLA),ECDLA RI improves the Signal-to-noise ratio(SNR) up to 0.66 dB and reduces the Mean phase error(MPE) up to 0.0735 than DLA *** the same MPE,ECDLA AP outperforms DLA AP by up to 0.87 dB in ***,the proposed method is also suitable for real-time applications.

关键词： Synthetic aperture radar image compression Dictionary learning Sparse representation

Practice for Extending Blast Furnace Campaign Life at Wuhan Iron and Steel Corporation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2006年第6期13卷 1-7,20页

作者： zhang Shou rong Wuhan Iron and Steel Corporation Wuhan 430083 Hubei China

One of the problems encountered in 60＇s to 80＇s of 20th century in China＇s steel industry was short life of blast furnace shaft as well as the excessive erosion of blast furnace hearth. A series of research work was carried out in order to extend blast furnace campaign life. The concept of research and development was integrated in the construction of BF （blast furnace） No. 5 at WISCO （Wuhan Iron and Steel Corporation）, and in October, 1991, the BF No. 5 was blown in. The blast furnace has worked smoothly for more than 15 years without any medium repair even guniting. It is expected that the campaign life of BF No. 5 would be longer than 16 years with a production over 11 000 t per unit inner volume （m^2）. A new blast furnace with an inner volume of 3 400 m^3 is under construction, and is designed with a campaign life of 20 years without any medium repair. The campaign life of blast furnaces in China has been extended in recent years.

关键词： blast furnace campaign life erosion

A Hybrid Coupled Model for the Pacific Ocean–Atmosphere *** I: Description and Basic Performance

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2015年第3期32卷 301-318页

作者： zhang rong-Hua Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences

A hybrid coupled model （HCM） is constructed for El Nifio-Southern Oscillation （ENSO）-related modeling studies over almost the entire Pacific *** ocean general circulation model is coupled to a statistical atmospheric model for interannual wind stress anomalies to represent their dominant coupling with sea surface *** addition,various relevant forcing and feedback processes exist in the region and can affect ENSO in a significant way; their effects are simply represented using historical data and are incorporated into the HCM,including stochastic forcing of atmospheric winds,and feedbacks associated with freshwater flux,ocean biology-induced heating （OBH）,and tropical instability waves （TIWs）.In addition to its computational efficiency,the advantages of making use of such an HCM enable these related forcing and feedback processes to be represented individually or collectively,allowing their modulating effects on ENSO to be examined in a clean and clear *** this paper,examples are given to illustrate the ability of the HCM to depict the mean ocean state,the circulation pathways connecting the subtropics and tropics in the western Pacific,and interannual variability associated with *** satellite data are taken to parameterize processes that are not explicitly represented in the HCM,this work also demonstrates an innovative method of using remotely sensed data for climate *** model applications related with ENSO modulations by extratropical influences and by various forcings and feedbacks will be presented in Part Ⅱ of this study.

关键词： hybrid coupled model ocean-atmosphere coupling ENSO forcing feedback satellite data

A DISCRETIZING LEVENBERG-MARQUARDT SCHEME FOR SOLVING NONLIEAR ILL-POSED INTEGRAL EQUATIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2022年第5期40卷 686-710页

作者： rong zhang Hongqi Yang School of Mathematics and Computer Science Gannan Normal UniversityGanzhou 341004China Guangdong Province Key Laboratory of Computational Science School of Computer Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China

To reduce the computational cost,we propose a regularizing modified LevenbergMarquardt scheme via multiscale Galerkin method for solving nonlinear ill-posed *** results for the regularizing modified Levenberg-Marquardt scheme for the solution of nonlinear ill-posed problems have been *** on these results,we propose a modified heuristic parameter choice rule to terminate the regularizing modified Levenberg-Marquardt *** imposing certain conditions on the noise,we derive optimal convergence rates on the approximate solution under special source *** results are presented to illustrate the performance of the regularizing modified Levenberg-Marquardt scheme under the modified heuristic parameter choice.

关键词： The regularizing Levenberg-Marquardt scheme Multiscale Galerkin methods Nonlinear ill-posed problems Heuristic parameter choice rule Optimal convergence rate.

Phase-field simulation of dendritic growth in a forced liquid metal flow coupling with boundary heat flux

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2013年第10期56卷 2586-2593页

作者： DU LiFei zhang rong zhang LiMin School of Science Key Laboratory of Space Applied Physics and Chemistry Ministry of EducationNorthwestern Polytechnical University

A phase-field model with forced liquid metal flow was employed to study the effect of boundary heat flux on the dendritic structure forming of a Ni-40.8%Cu alloy with liquid flow during *** effect of the flow field coupling with boundary heat extractions on the morphology change and distributions of concentration and temperature fields was analyzed and *** forced liquid flow could significantly affect the dendrite morphology,concentration and temperature distributions in the solidifying *** coupling with boundary heat extraction,the solute segregation and concentration diffusion were changed with different heat *** morphology,concentration and temperature distributions were significantly influenced by increasing the heat extraction,which could relatively make the effect of liquid flow *** increasing the initial velocity of liquid flow,the lopsided rate of the primary dendrite arm was enlarged and the transition of developing manner of the secondary arms moved to the large heat extraction *** was the competition between heat flux and forced liquid flow that finally determined microstructure forming during solidification.

关键词： phase-field simulation liquid flow heat flux solidification

Modeling and Analysis of a Micromotor with an Electrostatically Levitated Rotor

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2009年第1期22卷 1-8页

作者： HAN Fengtian WU Qiuping zhang rong Department of Precision Instruments and Mechanology Tsinghua University Beijing 100084 China

The modeling and evaluation of a prototype rotary micromotor where the annular rotor is supported electrostatically in five degrees of freedom is presented in order to study the behavior of this levitated micromotor and further optimize the device geometry. The analytical torque model is obtained based on the principle of a planar variable-capacitance electrostatic motor while the viscous damping caused by air film between the stator and rotor is derived using laminar Couette flow model. Simulation results of the closed-loop drive motor, based on the developed dynamic model after eliminating mechanical friction torque via electrostatic suspension, are presented. The effects of the high-voltage drive, required for rotation of the rotor, on overload capacity and suspension stiffness of the electrostatic bearing system are also analytically evaluated in an effort to determine allowable drive voltage and attainable rotor speed in operation. The analytical results show that maximum speed of the micromotor is limited mainly by viscous drag torque and stiffness of the bearing system. Therefore, it is expected to operate the device in vacuum so as to increase the rotor speed significantly, especially for those electrostatically levitated micromotors to be used as an angular rate micro-gyroscope.

关键词： electrostatic levitation electrostatic micromotor variable-capacitance motor micro-gyroscope

All-atom Molecular Dynamic Simulations and NMR Spectra Study on Intermolecular Interactions of N,N-dimethylacetamide-Water System

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第3期21卷 221-226页

作者： rong zhang Zai-you Tan San-lai Luo Lab of Physical Chemistry College of Pharmacy Guangdong Pharmaceutical University Guangzhou510006 China

N,N-dimethylacetamide （DMA） has been investigated extensively in studying models of peptide bonds. An all-atom MD simulation and the NMR spectra were performed to investigate the interactions in the DMA- water system. The radial distribution functions （RDFs） and the hydrogen-bonding network were used in MD simulations. There are strong hydrogen bonds and weak C-H…O contacts in the mixtures, as shown by the analysis of the RDFs. The insight structures in the DMA-water mixtures can be classified into different regions by the analysis of the hydrogen-bonding network. Chemical shifts of the hydrogen atom of water molecule with concentration and temperatures are adopted to study the interactions in the mixtures. The results of NMR spectra show good agreement with the statistical results of hydrogen bonds in MD simulations.

关键词： All-atom simulation NMR spectrum DMA-water system Hydrogen bond

Continuity in Weak Topology: First Order Linear Systems of ODE

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2010年第7期26卷 1287-1298页

作者： Gang MENG Mei rong zhang Department of Mathematical Sciences Tsinghua University Beijing 100084 P. R. China

In this paper we study important quantities defined from solutions of first order linear systems of ordinary differential equations. It will be proved that many quantities, such as solutions, eigenvalues of one-dimensional Dirac operators, Lyapunov exponents and rotation numbers, depend on the coefficients in a very strong way. That is, they are not only continuous in coefficients with respect to the usual L^p topologies, but also with respect to the weak topologies of the Lp spaces. The continuity results of this paper are a basis to study these quantities in a quantitative way.

关键词： eigenvalue Dirac operator Lyapunov exponent rotation number continuity weak topology