全文获取类型
收费全文 | 452篇 |
免费 | 89篇 |
国内免费 | 75篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 10篇 |
2021年 | 18篇 |
2020年 | 6篇 |
2019年 | 15篇 |
2018年 | 26篇 |
2017年 | 47篇 |
2016年 | 33篇 |
2015年 | 25篇 |
2014年 | 44篇 |
2013年 | 58篇 |
2012年 | 38篇 |
2011年 | 38篇 |
2010年 | 16篇 |
2009年 | 27篇 |
2008年 | 18篇 |
2007年 | 32篇 |
2006年 | 49篇 |
2005年 | 39篇 |
2004年 | 20篇 |
2003年 | 14篇 |
2002年 | 4篇 |
2001年 | 13篇 |
2000年 | 8篇 |
1999年 | 5篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1994年 | 3篇 |
1993年 | 2篇 |
排序方式: 共有616条查询结果,搜索用时 15 毫秒
611.
612.
613.
614.
Anna Jackman 《Defense & Security Analysis》2019,35(4):362-383
ABSTRACTWhile the drone has become synonymous with the War on Terror, the asymmetric iconography of the battlefield is shifting. Commercially available off-the-shelf (COTS) drones are increasingly prevalent features of global battlefields, employed by non-state actors in both visualising such spaces, and the directing and inflicting of harm. As such usage increases, so too do concerns around their evolving adoption, adaptation, and potential portability into homeland spheres. While cognizant of the range of positive drone applications, it is asserted that drones nonetheless remain simultaneously bound to an inverse potential for exploitation. In examining drone risk, this article approaches the consumer drone through a series of sites and spaces through which it is technically and socially constructed. Reflecting upon industry innovation, community-driven experimentation, and evolving airspace – it calls for greater attention to the drone’s malleability, arguing that understandings of COTS drones must remain attentive to both drone potential and potential drone threat. 相似文献
615.
ABSTRACTThis article analyses findings from an original survey of 187 private military contractors on their incentives for working in the industry. Perceptions of contractors as “greedy, ruthless, and unscrupulous mercenaries” shape both public and military opinions of outsourcing and may impact U.S. military effectiveness, civil–military relations, and contractor identity. We find that contractors are motivated by a range of factors and that their financial experiences are not clearly more positive than that of state military troops. We recommend broad education of military and defense officials and the public in the U.S. and other relevant nations, regarding the true incentives of modern-day, Western contractors, in an effort to dispel misperceptions, increase effective utilisation of contractors, and beneficially shape PMC-military coordination. DoD may consider integrating such training into its current efforts to improve outsourcing, including its Joint OCS Planning and Execution Course, pre-deployment fora, and curricula of advanced military studies schools. 相似文献
616.
对地目标检测与识别是无人机系统典型任务之一,但受限于任务特殊性,往往难以获取足够的目标样本数据以实现高可靠的目标识别.为此,结合人的认知特性,提出一种基于部件模型的小样本车辆目标识别方法,可有效提高无人机感知能力.采用视觉显著性检测与物体性检测相结合的检测方法,提取目标可能区域;采用基于图论的GrabCut方法与最大类... 相似文献