首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   213篇
  免费   7篇
  国内免费   1篇
  2021年   2篇
  2019年   10篇
  2018年   7篇
  2017年   5篇
  2016年   4篇
  2014年   6篇
  2013年   42篇
  2012年   3篇
  2011年   1篇
  2010年   6篇
  2007年   6篇
  2006年   2篇
  2005年   6篇
  2004年   4篇
  2003年   1篇
  2002年   7篇
  2001年   1篇
  2000年   2篇
  1999年   4篇
  1998年   7篇
  1997年   7篇
  1996年   1篇
  1995年   1篇
  1994年   1篇
  1993年   6篇
  1991年   3篇
  1990年   3篇
  1989年   2篇
  1986年   4篇
  1985年   6篇
  1984年   1篇
  1983年   2篇
  1982年   5篇
  1981年   5篇
  1980年   3篇
  1979年   4篇
  1978年   4篇
  1977年   3篇
  1976年   3篇
  1975年   3篇
  1974年   3篇
  1973年   4篇
  1972年   3篇
  1971年   1篇
  1969年   2篇
  1968年   5篇
  1967年   2篇
  1966年   3篇
  1949年   1篇
  1948年   2篇
排序方式: 共有221条查询结果,搜索用时 343 毫秒
131.
132.
133.
134.
The USA's role in fomenting and responding to military coups remains an understudied and politically contentious subject despite it being a recurring foreign policy problem exemplified most recently in both Egypt and Mali. To the extent this topic has been addressed in any depth by scholars, it is mainly limited to an examination of a small number of coups that occurred during the Cold War that the CIA was accused of sponsoring. However, this emphasis on well-known cases to the exclusion of lesser-known cases has resulted in a biased view of omnipotent US power. This limitation is reflected in the case of South Vietnam, in which the focus has been placed on the 1963 coup that overthrew President Ngo Dinh Diem, whereas the numerous other coups that occurred have received little or no attention. In this article, a more inclusive approach will be taken in which US policy will be examined with respect to all of the main coups and coup attempts that occurred during the period 1954–1975.  相似文献   
135.
Capacity expansion models are typically formulated in the context of some finite horizon. Because the firm lasts longer than the horizon, a bias can enter into the optimal solution from the model horizon chosen. Recently, Grinold [8] has proposed a “dual-equilibrium method” for ameliorating possible distortions. Although the dual-equilibrium method has superior analytical properties to other methods, it is conceptually more complex. In this paper it is shown that there are situations where the “primal-equilibrium” approach of Manne [15] provides equivalent results and that the use of annualized capital costs in the objective function, although somewhat less efficient, results in a similar model.  相似文献   
136.
Book reviews     
Soviet Nuclear Strategy from Stalin to Gorbachev: a Revolution in Soviet Military and Political Thinking. By Honore M. Catudal. Mansell, London (1988), ISBN 0–7201–2000–4, £25.00

The Military: More Than Just a Job? Edited by Charles C. Moskos and Frank R. Wood. Pergamon‐Brassey's, London (1988), ISBN 0–08–034321‐X, £17.00 ($30.00)

Douglas Haig, 1861–1928. By Gerard J. de Groot. Unwin Hyman, London (1988), ISBN 004 4401922, £20.00

Defence Policy Making. A Comparative Analysis. Edited by G. M. Dillon. Leicester University Press, Leicester (1988), ISBN 0–715–1268–5, £10.95

The Future of U.K. Air Power. Edited by P. Sabin. Brassey's, London (1988), ISBN 0–08–035825‐X (hardcover), 0–08–036256–7 (flexicover), hardcover £18.95 ($34.00), flexicover £9.95 ($17.95)  相似文献   

137.
The present analysis deals with very high-dimensional data sets, each one containing close to 900 binary variables. Each data set corresponds to an evaluation of one complex system. These data sets are characterized by large portions of missing data where, moreover, the unobserved variables are not the same in different evaluations. Thus, the problems which confront the statistical analysis are those of multivariate binary data analysis, where the number of variables is much larger than the sample size and in which missing data varies with the sample elements. The variables, however, are hierarchically structured and the problem of clustering variables to groups does not exist in the present study. In order to motivate the statistical problem under consideration, the Marine Corps Combat Readiness Evaluation System (MCCRES) is described for infantry battalions and then used for exposition. The present article provides a statistical model for data from MCCRES and develops estimation and prediction procedures which utilize the dependence structure. The E-M algorithm is applied to obtain maximum-likelihood estimates of the parameters of interest. Numerical examples illustrate the proposed methods.  相似文献   
138.
139.
We consider the problem of allotting locations in the geostationary orbit to communication satellites, subject to angle of elevation and electromagnetic interference constraints. An optimization framework is used as a means of finding feasible allotment plans. Specifically, we present a two-phase solution procedure for the satellite location problem (SLP). The objective in SLP is to allot geostationary orbital locations to satellites so as to minimize the sum of the absolute differences between the locations prescribed for the satellites and corresponding specified desired locations. We describe two heuristics, an ordering procedure and a k-permutation algorithm, that are used in tandem to find solutions to SLP. Solutions to a worldwide example problem with 183 satellites serving 208 service areas are summarized.  相似文献   
140.
Achtung-Panzer! By Major General Heinz Guderian, Translated by Christopher Duffy with Introduction and Notes by Paul Harris. (Arms & Armour Press £16.99. ISBN 1-85409-138-7, 220 pages)  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号