全文获取类型
收费全文 | 2410篇 |
免费 | 336篇 |
国内免费 | 153篇 |
出版年
2024年 | 3篇 |
2023年 | 7篇 |
2022年 | 21篇 |
2021年 | 34篇 |
2020年 | 27篇 |
2019年 | 63篇 |
2018年 | 52篇 |
2017年 | 90篇 |
2016年 | 92篇 |
2015年 | 63篇 |
2014年 | 205篇 |
2013年 | 268篇 |
2012年 | 145篇 |
2011年 | 196篇 |
2010年 | 165篇 |
2009年 | 185篇 |
2008年 | 143篇 |
2007年 | 170篇 |
2006年 | 144篇 |
2005年 | 141篇 |
2004年 | 132篇 |
2003年 | 102篇 |
2002年 | 68篇 |
2001年 | 72篇 |
2000年 | 38篇 |
1999年 | 38篇 |
1998年 | 26篇 |
1997年 | 27篇 |
1996年 | 29篇 |
1995年 | 23篇 |
1994年 | 29篇 |
1993年 | 17篇 |
1992年 | 19篇 |
1991年 | 16篇 |
1990年 | 24篇 |
1989年 | 12篇 |
1988年 | 10篇 |
1987年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有2899条查询结果,搜索用时 15 毫秒
771.
772.
大规模MIMO系统时分双工模式中分配的物理时隙长度是固定的,不能根据不同时长的信道相干时间灵活地调整长度,二者长度的不匹配导致部分时频资源的浪费,因此,系统的总体容量不能达到最优。针对此问题提出一种用户分层变长时隙分配方法,即根据不同终端的移动性对终端进行分层,并为不同层中的移动终端灵活地分配不同时长的物理时隙,使物理时隙长度与移动终端所对应信道的相干时长相匹配,从而减少时频资源的浪费,提高资源利用率。同时,避免了低速移动终端过频繁的信道估计,降低了信道训练序列开销,使系统的总体数据容量得到很大的提升。实验仿真结果验证了所提方法的有效性。 相似文献
773.
774.
775.
图像修复是指对图像破损区域进行填充或者将图像中多余物体进行移除。在Criminisi算法的基础上进行改进,在待修复块优先权的计算过程中,由于等照度线的曲率可以反映图像的局部特征,块与块之间的方差值可以反映图像的边缘信息,因此,将二者考虑进来,确保修复过程能够准确有序地进行。在寻找最佳匹配块时,将等照度线的曲率也作为一个因素增加进来,有效地提高了最佳匹配块搜索的精确性。经过仿真实验证明,改进后的算法不仅在PSNR值上比原算法有所提高,而且修复结果也比原算法更加准确可靠。 相似文献
776.
777.
778.
779.
Cornelia Vikan 《Journal of Military Ethics》2017,16(3-4):239-255
This paper discusses soldiers’ moral responsibility in today’s complex conflicts. The point of departure is the increased focus on soldiers as moral decision-makers in war, illustrated by the introduction of core values in the Norwegian Armed Forces. Responsibility is one of these core values, but it is not clear exactly how we should understand responsibility. I use a case where a group of Norwegian soldiers in the International Security Assistance Force (ISAF) sought the cooperation of a group of mujahedeen to solve the military mission of establishing security. As confidence between the parties grew, the soldiers became horrified witnesses to a practice of bacha bazi, where a young boy is dressed up for entertainment and sexual abuse. This situation gives reason to question the limits of role responsibility, the status of soldiers’ legitimacy, and the challenges of making morally sound judgments in a multicultural context. The discussion demonstrates that, even if there are restrictions on the soldiers’ freedom to act, a responsibility reaching beyond or extending their role should be recognized as part of the moral reality of modern soldiers. 相似文献
780.
Walter Dorn 《Journal of Military Ethics》2017,16(3-4):272-285
Central to the mainstream Sikh identity is the concept of ethically-justified force, used as a last resort. There is no place for absolute pacifism in this conception of ethical living. Fighters and martyrs occupy an important place in the Khalsa narrative, and Sikhs are constantly reminded of the sacrifices and heroism of their co-religionists of the past. This article explores how the Sikh warrior identity is manifested in the contemporary world. It examines the Sikhs who, in the 1980s and 1990s, were involved on both sides of the Punjab crisis: those militants who fought for a Sikh homeland (“Khalistan”) and those Sikhs in the Indian army who suppressed the insurgency. The article also looks beyond the militants and soldiers to Sikhs employed in modern security-related professions, the broader issue of Sikh symbols relating to the use of force, and violence within the Sikh diaspora. An examination of the Sikhs in various parts of the world reveals additional uses and consequences of ideology, whether in enlistment in the armed forces of the states in which they live, or in the support of the militancy in India, particularly in the 1980s. The conclusion is that the modern Sikh warrior is a nuanced actor behaving in various ways, some overt and some subtle: the warrior is willing to physically fight those perceived to be tyrannous, but most initiatives have shifted to pursuing justice through non-violent means, such as legal struggles for civil rights. Although armed Sikh militancy against the Indian government is in the past, there are strong residual resentments still requiring redress. All of this is of great relevance to understanding the ethics of armed force within modern Sikhism. 相似文献