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检索结果：检索 返回 139 结果。
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 期刊 
关注和发展摩擦学,推动经济可持续发展
  • 作者：王国彪，雷源忠
  • 关键词：经济可持续发展；摩擦学；资源利用率；能源消耗；节约能源；节约材料；保护环境；科学问题；循环经济；磨损；社会；工业
  • 摘要： 由摩擦引起的磨损、润滑、材料与能源消耗等一系列摩擦学问题普遍存在并对社会、经济的发展产生了巨大影响.由于摩擦学科学所涉及的问题,与节约能源、节约材料、减少磨损、提高资源利用率和保护环境等密切相关,成为我国走新型化工业道路和发展循环经济必须面对的科学问题,已受到科技界的高度重视. 据估计,人类一次能源大约1/3是消耗于摩擦损失,约有70%的设备损坏是由于各种形式的磨损而引

  • 被引量：16

 期刊 
Stability of the Distribution in a Money Exchange Model
  • 作者：杨纯斌 （ Institute of Particle Physics, Huazhong Normal University, Wuhan ）
  • 关键词：非线性货币兑换模型；发行稳定性；货币发行量估计；国家经济稳定性
  • 摘要： A nonlinear money exchange model is revised and a correct master equation is derived. The evolution of the distribution is studied from direct numerical and analytical calculations. The stability of the final steady state of the system is investigated. It is argued that the final distribution is valid for a group of conservative money exchange models.
 期刊 
Evolvement Complexity in an Artificial Stock Market
  • 作者：YANG Chun-Xia，ZHOU Tao，ZHOU Pei-Ling，LIU Jun，TANG Zi-Nan （ Department of Electronic Science and Technology, University of Science and Technology of China, Hefei ）
  • 关键词：多介质模型；人造股票市场；相位演化；勒维分布
  • 摘要： An artificial stock market is established based on the multi-agent model.Each agent has a limited memory of the history of stock price, and will choose an action according to its memory and trading strategy.The trading strategy of each agent evolves ceaselessly as a result of a self-teaching mechanism.The simulation results exhibit that large events are frequent in the fluctuation of the stock pri...
 期刊 
Crossover Phenomena in Detrended Fluctuation Analysis Used in Financial Markets
  • 作者：MA Shi-Hao （ College of Physical Science and Technology, Huazhong Normal University, Wuhan 430079, China ）
  • 关键词：financial market；crossover phenomena；detrended fluctuation analysis
  • 摘要： A systematic analysis of Shanghai and Japan stock indices for the period of Jan.1984 to Dec.2005 is performed.After stationarity is verified by ADF (Augmented Dickey-Fuller) test, the power spectrum of the data exhibits a power law decay as a whole characterized by 1/fβ processes with possible long range correlations.Subsequently, by using the method of detrended fluctuation analysis (DFA) of the ...
 期刊 
Ruin probabilities with insurance and financial risks having an FGM dependence structure
  • 作者：CHEN Yu1，YANG YingYing2 （ 1Department of Statistics and Finance,School of Management,University of Science and Technology of China；2School of Mathematical Science,Anhui University ）
  • 关键词：asymptotics；Farlie-Gumbel-Morgenstern distribution；quasi-asymptotic independence；regular variation；ruin probabilities
  • 摘要： We consider a discrete-time risk model,in which insurance risks and financial risks jointly follow a multivariate Farlie-Gumbel-Morgenstern distribution,and the insurance risks are regularly varying tailed.Explicit asymptotic formulae are obtained for finite-time and infinite-time ruin probabilities.Some numerical results are also presented to illustrate the accuracy of our asymptotic formulae.

  • 被引量：5

 期刊 
Tail asymptotic expansions for L-statistics
  • 作者：HASHORVA Enkelejd1，LING ChengXiu1，PENG ZuoXiang2 （ 1Department of Actuarial Science,Faculty of Business and Economics,University of Lausanne；2School of Mathematics and Statistics,Southwest University ）
  • 关键词：渐近展开；统计；风险度量；L型；蒙特卡罗模拟；分布函数；正规变化；关键词
  • 摘要： We derive higher-order expansions of L-statistics of independent risks X1,...,Xn under conditions on the underlying distribution function F.The new results are applied to derive the asymptotic expansions of ratios of two kinds of risk measures,stop-loss premium and excess return on capital,respectively.Several examples and a Monte Carlo simulation study show the efficiency of...

  • 被引量：1

 期刊 
A CASE STUDY ON CONCENTRATION AND DECENTRALIZATION: BEHAVIOR AND DYNAMIC MECHANISM OF SPATIAL EVOLUTION IN METROPOLITAN AREA, NANJING, CHINA
  • 作者：ZHU Xi-gang，ZHANG Jing-xiang，CHEN Hu （ Department of Urbanand Resources Sciences， Nanjing University， Nanjing 210093， P. R. China ）
  • 关键词：concentration；decentralization；dynamic mechanism；Nanjing Metropolis
  • 摘要： In rapid socio-economic development, the process of concentration and dispersal of various elements tendsto be more dramatic, tremendously influencing the shaping and transformation of the space in metropolitan area. Surveyof spatial concentration and decentralization has thus become a basic method in examining metropolitan spatial evolution.In this research, three elements were selected as the es...
 期刊 
Health Safety of Main Water Pipe Materials Supplied in China Market
  • 作者：KAI LU，LIANG DING，HONG-WEI WANG，HAI-NING JING，XIAO-NING ZHAO，SHAO-BIN LIN，YA-DONG LI，YIN-LONG JIN，FENG-MAO LIU，SHU-REN JIANG （ College of Science, China Agricultural University, Beijing 100094, China；Institute of Environment and Health Related Product Safety, Chinese Center for Disease Control and Prevention, Beijing 100021, ... ）
  • 关键词：Copper；Steel；Plastic；Water pipes；Health safety
  • 摘要： Objective To assess the health safety of copper, steel and plastic water pipes by field water quality investigations. Methods Four consumers were randomly selected for each type of water pipes. Two consumers of every type of the water pipes had used the water pipes for more than 1 year and the other 2 consumers had used the water pipes for less than 3 months. The terminal volume of tap water in co...
 期刊 
Empirical Study on the Volatility of the Hang-Seng Index
  • 作者：蔡世民，周佩玲，杨会杰，杨春霞，汪秉宏，周涛 （ Department of Electronic Science and Technology, University of Science and Technology of China, Hefei；Department of Modern Physics and Nonlinear Science Center, University of Science and Technology of... ）
  • 关键词：统计特性；挥发性；香港；股票市场；数学经济学
  • 摘要： We study the statistical properties of volatility of price fluctuation for the Hang-Seng index in the Hong Kong stock market, they are measured by locally averaging over a time window T, the absolute value of price change over a short time interval △t. The data include minute-by-minute records of the Hang-Seng index from 3 January 1994 to 28 May 1997. We find that the cumulative distribution of th...
 期刊 
Note on Two-Phase Phenomena in Financial Markets
  • 作者：JIANG Shi-Mei，CAI Shi-Min，ZHOU Wao，ZHOU Pei-Ling （ Department of Electronic Science and Technology, University of Science and Technology of China, Hefei；Department of Electronic Science and Technology, University of Science and Technology of China, He... ）
  • 关键词：金融市场；两相现象；复杂系统；市场信息
  • 摘要： The two-phase behaviour in financial markets actually means the bifurcation phenomenon, which represents the change of the conditional probability from an unimodal to a bimodal distribution. We investigate the bifurcation phenomenon in Hang-Seng index. It is observed that the bifurcation phenomenon in financial index is not universal, but specific under certain conditions. For Hang-Seng index and ...