全文获取类型
| 收费全文 | 851篇 |
| 免费 | 0篇 |
专业分类
| 851篇 |
出版年
| 2019年 | 17篇 |
| 2018年 | 8篇 |
| 2017年 | 23篇 |
| 2016年 | 16篇 |
| 2015年 | 20篇 |
| 2014年 | 16篇 |
| 2013年 | 166篇 |
| 2011年 | 9篇 |
| 2010年 | 8篇 |
| 2009年 | 16篇 |
| 2008年 | 8篇 |
| 2007年 | 8篇 |
| 2006年 | 11篇 |
| 2005年 | 15篇 |
| 2004年 | 17篇 |
| 2003年 | 9篇 |
| 2002年 | 12篇 |
| 2000年 | 10篇 |
| 1999年 | 10篇 |
| 1998年 | 14篇 |
| 1997年 | 8篇 |
| 1996年 | 14篇 |
| 1994年 | 21篇 |
| 1993年 | 17篇 |
| 1992年 | 12篇 |
| 1991年 | 25篇 |
| 1990年 | 9篇 |
| 1989年 | 19篇 |
| 1988年 | 17篇 |
| 1987年 | 21篇 |
| 1986年 | 23篇 |
| 1985年 | 24篇 |
| 1984年 | 11篇 |
| 1983年 | 9篇 |
| 1982年 | 8篇 |
| 1981年 | 10篇 |
| 1980年 | 7篇 |
| 1979年 | 11篇 |
| 1978年 | 14篇 |
| 1977年 | 7篇 |
| 1976年 | 11篇 |
| 1975年 | 7篇 |
| 1974年 | 12篇 |
| 1973年 | 9篇 |
| 1972年 | 16篇 |
| 1971年 | 9篇 |
| 1970年 | 16篇 |
| 1969年 | 10篇 |
| 1968年 | 7篇 |
| 1967年 | 11篇 |
排序方式： 共有851条查询结果，搜索用时 0 毫秒
171.
In a rendezvous search problem, two players are placed in a network and must try to meet each other in the least possible expected time. We look at rendezvous search on a discrete interval in which the players are initially placed using independent draws (usually assumed to be from the same distribution). Some optimal solutions are known if this distribution is uniform, and also for certain other special types of distribution. In this article, we present two new results. First, we characterize the complete set of solutions for the uniform case, showing that all optimal strategies must have two specific properties (namely, of being swept and strictly geodesic). Second, we relate search strategies on the interval to proper binary trees, and use this correspondence to derive a recurrence relation for solutions to the symmetric rendezvous problem for any initial distribution. This relation allows us to solve any such problem computationally by dynamic programming. Finally, some ideas for future research are discussed. © Wiley Periodicals, Inc. Naval Research Logistics 60: 454–467, 2013 相似文献
172.
Ronald J Kurth Former President of the U.S. Naval War College 《战略研究杂志》2013,36(2):261-280
This article is a portrait of Admiral Sergei Gorshkov, commander of the Soviet Navy for almost three decades, from 1956–85. The author, a retired US Navy admiral with a Harvard PhD in Russian studies who served as both defense and naval attaché in Moscow, draws on numerous face-to-face interactions with Gorshkov. He also explores Gorshkov's memoirs that were published recently in Russia but have not appeared in an English translation. The paper is not only a first-hand account of an important historical figure, but also a window into the world of military-to-military diplomacy and intelligence during the Cold War. 相似文献
173.
Gary E Weir 《战略研究杂志》2013,36(2):411-427
The Cold War at sea expanded in many realms, including the frigid and treacherous waters of the Arctic Ocean. The US Navy pioneered these efforts with the visit of USS Nautilus to the North Pole in 1958. During the latter stages of the Cold War, however, Soviet naval strategists began to conceptualize the polar ice cap as a strategic asset for cloaking the operations of its nuclear missile submarines. As under-ice operations afforded the Soviet submarine fleet advantages of stealth, proximity to target and tighter lines of communications, both navies were forced to try to develop tactics for combat under these extremely complex and arduous conditions. 相似文献
174.
Andrew J. Dowdle 《Small Wars & Insurgencies》2013,24(2):161-174
Previous research on African military spending suggests the existence of civil strife as the best predictor of high levels of military spending. However, little is known about why some African nations maintain strong ‘auxiliary’ or paramilitary organizations while others do not. This study finds that the presence of civil or interstate war does not strengthen reserve or irregular forces. Civilian governments promote strong paramilitary organizations to counter any threat the regular military might pose to regime survivability as a form of clientelist politics. 相似文献
175.
Matthew J. Thomas 《Small Wars & Insurgencies》2013,24(3):413-435
On 9 February 2012 the Somali terrorist organization al-Shabaab officially merged with al-Qaeda. While the significance of the merger is highly contested, it does expose internal weaknesses within the two organizations along ideological, clan, and sectarian lines. The article identifies three key weaknesses of the merger and concludes with a discussion of al-Qaeda's growing presence in trans-Saharan Africa. 相似文献
176.
Franz J. Gayl 《Defence and Peace Economics》2013,24(5):465-484
This comment addresses the Rohlfs–Sullivan analysis titled: ‘The Cost-Effectiveness of Armored Tactical Wheeled Vehicles [TWVs] for Overseas US Army Operations.’ The analysis evaluated policies to replace Type 1 and 2 TWVs with Type 3s. There is no evidence the analysis factored in fatality causes, fatality relationships to vehicles, or compared survivability of vehicles. Furthermore, it did not note when Type 3 TWVs were requested, when they impacted fatalities, or TWV use policies. It also assumed Type 3 TWVs prompted negative unit behaviors while discounting evidence of positive behaviors. In summary, the analysis is incomplete and should be revised. 相似文献
177.
J. M. Quinn 《Defence and Peace Economics》2013,24(5):536-554
This study models the structural sources of variation in the use of selective (discriminate) repression within 89 civil wars fought between 1981 and 2005. The severity of repressive violence is modeled as a function of the amount of territory being contested by the insurgents. This idea is operationalized using measures of the location, size, and density of insurgency violence. The analysis finds evidence that the repressive behavior of both governments and rebel groups is linked to conflict geography. Governments violate physical integrity rights more frequently and kill more civilians the greater the overall amount of territory under contestation. Rebels kill more civilians in highly dispersed insurgencies that lack a clear epicenter. 相似文献
178.
We explore the impact of strategic assessment efforts on military organizations at war. To do so, we construct a model to explore the impact of a principal’s choice among imperfect performance metrics for a military operation. In doing so, the principal must consider both the incentivizing and informational properties of the metric. We show the conditions under which uncertainty regarding the nature of the agent, as well as uncertainty regarding the operational environment, drives a metric choice that induces pathological behavior from the agent. More specifically, a poor metric choice can create an overly optimistic assessment and end up prolonging the conflict. We illustrate the model’s insights in the cases of World War II and the Vietnam War. 相似文献
179.
This study uses the Feder-Ram model in conjunction with the military Keynesian model to examine the nexus between defence spending and economic growth in Sri Lanka. We find that the Keynesian aggregate demand model is better suited to analyse the link than the Feder-Ram model for the case of Sri Lanka. Based upon our results we expect a higher economic growth rate in Sri Lanka if more public resources are diverted from the defence to civilian sectors of the economy, now that the war between the government and separatist guerrillas has come to an end. However, recent post war events cast doubt upon whether a diversion of sources from military to non-military spending will actually occur. We conclude that the sanguine predictions of our economic analysis are entirely dependent upon the political decisions of the Sri Lankan government for their realization. 相似文献
180.
AbstractThis paper examines the impact of civil war on military expenditure. We employ two measures of military expenditure: the share of military expenditure in general government expenditure and the logarithm of military expenditures. We would reasonably expect a priori that military expenditure as a share of general government expenditure increases during a civil war and that such increases would taper off over the duration of a civil war. We also explore whether the termination of a civil war induces a decline in the share of military expenditure as a share of the general government expenditure in the short-run. We find evidence the of share of military expenditure increases during a civil war and falls in the year succeeding the end of a civil war, and, in particular, if a war ends in a peace treaty. The level of military expenditures, however, rises during civil wars and does not appear to decline in the short-term after the end of a civil war. 相似文献