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   287篇
  免费   8篇
  295篇
  2021年   2篇
  2020年   3篇
  2019年   5篇
  2018年   4篇
  2017年   7篇
  2016年   7篇
  2015年   6篇
  2013年   59篇
  2011年   4篇
  2009年   6篇
  2008年   4篇
  2007年   2篇
  2006年   3篇
  2005年   7篇
  2004年   7篇
  2003年   4篇
  2002年   2篇
  2000年   3篇
  1999年   4篇
  1998年   2篇
  1997年   2篇
  1996年   8篇
  1995年   3篇
  1994年   7篇
  1993年   3篇
  1992年   5篇
  1991年   12篇
  1989年   5篇
  1988年   3篇
  1987年   7篇
  1986年   9篇
  1985年   12篇
  1984年   3篇
  1983年   3篇
  1980年   3篇
  1979年   3篇
  1978年   3篇
  1977年   5篇
  1976年   4篇
  1974年   5篇
  1973年   2篇
  1972年   8篇
  1971年   5篇
  1970年   8篇
  1969年   4篇
  1968年   4篇
  1967年   5篇
  1966年   3篇
  1949年   1篇
  1948年   1篇
排序方式: 共有295条查询结果,搜索用时 31 毫秒
21.
22.
23.
Given Kinsella's (1990, 1991) appeal for analysis to be pursued using sub‐annual level of data, we pursue such an endeavor in this paper. We examime the effect of defence spending on real output, the unemployment rate, price level, and interest rate covering a quarterly time frame 1960:1 to 1988:1 using an unrestricted vector autoregression framework. Our results parallel the findings of Kinsella in that there appears no causal relationship in either direction between defence spending and economic performance.  相似文献   
24.
25.
The threat posed by the proliferation of weapons of mass destruction is real and urgent. Combating this threat requires a new and comprehensive approach by the federal government. It requires sustained leadership at the top and an organizational structure that can set policies and objectives for combating proliferation; develop integrated, government‐wide plans to implement those policies and objectives, including plans for acquiring necessary technology; make appropriate decisions regarding how resources should be allocated to carry out those plans; and regularly evaluate the effectiveness of our policies, programs, and operations. There is no such comprehensive approach today.  相似文献   
26.
27.
28.
The problem is to protect a set of t targets by n perfect interceptors against an attack by m perfect weapons. If the defender solves for an optimal preallocated preferential defense and associated game value assuming m1 attackers, and the attacker knows the assumption of the defender and utilizes m2 attackers, he may be able to achieve significantly more damage than had the defender assumed that there would be m2 attackers. The article treats the robustness of preallocated preferential defense to assumptions about the size of the attack and presents results of an alternative approach.  相似文献   
29.
We study a stochastic outpatient appointment scheduling problem (SOASP) in which we need to design a schedule and an adaptive rescheduling (i.e., resequencing or declining) policy for a set of patients. Each patient has a known type and associated probability distributions of random service duration and random arrival time. Finding a provably optimal solution to this problem requires solving a multistage stochastic mixed‐integer program (MSMIP) with a schedule optimization problem solved at each stage, determining the optimal rescheduling policy over the various random service durations and arrival times. In recognition that this MSMIP is intractable, we first consider a two‐stage model (TSM) that relaxes the nonanticipativity constraints of MSMIP and so yields a lower bound. Second, we derive a set of valid inequalities to strengthen and improve the solvability of the TSM formulation. Third, we obtain an upper bound for the MSMIP by solving the TSM under the feasible (and easily implementable) appointment order (AO) policy, which requires that patients are served in the order of their scheduled appointments, independent of their actual arrival times. Fourth, we propose a Monte Carlo approach to evaluate the relative gap between the MSMIP upper and lower bounds. Finally, in a series of numerical experiments, we show that these two bounds are very close in a wide range of SOASP instances, demonstrating the near‐optimality of the AO policy. We also identify parameter settings that result in a large gap in between these two bounds. Accordingly, we propose an alternative policy based on neighbor‐swapping. We demonstrate that this alternative policy leads to a much tighter upper bound and significantly shrinks the gap.  相似文献   
30.
The human visual system is still an important factor in military warfare; military personnel receive training on effective search strategies, and camouflage that can effectively conceal objects and personnel is a key component of a successful integrated survivability strategy. Previous methods of camouflage assessment have, amongst others, used psychophysics to generate distinctiveness metrics. However, the population from which the human observers are drawn is often not well defined, or necessarily appropriate. In this experiment we designed a new platform for testing multiple patterns based on a camouflaged object detection task, and investigate whether trained military observers perform better than civilians. We use a two-alternative forced choice paradigm, with participants searching images of woodland for a replica military helmet displaying Olive Green, Multi Terrain Pattern, US Marine Pattern or, as a conspicuous control, UN Peacekeeper Blue. Our data show that there is no difference in detection performance between the two observer groups but that there are clear differences in the effectiveness of the different helmet colour patterns in a temperate woodland environment. We conclude that when tasks involve very short stimulus presentation times, task-specific training has little effect on the success of target detection and thus this paradigm is particularly suitable for robust estimates of camouflage efficacy.  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