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   279篇
  免费   16篇
各国政治   12篇
工人农民   12篇
世界政治   56篇
外交国际关系   18篇
法律   87篇
中国政治   3篇
政治理论   107篇
  2023年   5篇
  2022年   2篇
  2021年   2篇
  2020年   11篇
  2019年   7篇
  2018年   11篇
  2017年   19篇
  2016年   12篇
  2015年   4篇
  2014年   9篇
  2013年   33篇
  2012年   8篇
  2011年   7篇
  2010年   10篇
  2009年   6篇
  2008年   13篇
  2007年   14篇
  2006年   7篇
  2005年   17篇
  2004年   13篇
  2003年   9篇
  2002年   8篇
  2001年   9篇
  2000年   8篇
  1999年   2篇
  1998年   3篇
  1997年   2篇
  1995年   1篇
  1994年   1篇
  1993年   3篇
  1992年   3篇
  1990年   2篇
  1988年   2篇
  1987年   2篇
  1986年   1篇
  1985年   4篇
  1984年   2篇
  1983年   4篇
  1982年   2篇
  1981年   3篇
  1979年   2篇
  1977年   2篇
  1976年   1篇
  1975年   1篇
  1974年   1篇
  1973年   1篇
  1970年   1篇
  1969年   1篇
  1968年   1篇
  1967年   2篇
排序方式: 共有295条查询结果,搜索用时 359 毫秒
221.
This paper examines the growth of transnational networks of innovation and proposes a preliminary classificatory system of four distinct kinds of forces which give rise to social networks that facilitate knowledge flows, relationship building, and collaborative activities important to accessing global markets. The networks may form around a technology sector, be identity based, emerge from a government-led initiative, or be stimulated by a civic or philanthropic organization. Each has a different mode of organizing, financing, and meeting its objectives, as shown by examples presented in the paper. The proposed classification of these characteristics is intended to open a conversation within the social sciences and among policy makers about how better to understand the ways in which transnational networks get formed, operate and produce desired results.  相似文献   
222.
Nathan Fiala 《发展研究杂志》2013,49(10):1275-1293
Over 42 million people worldwide have been forcibly displaced from their communities, though little is known about the impact of this movement on livelihoods. I use a panel data set and exploit a geographic discontinuity to explore the effects of displacement in Uganda. I find that displaced households experience a significant initial decrease in consumption. Two years after households returned home, displaced households still lag behind. However, households in the top quartiles of pre-displacement assets have recovered some of their consumption, though with significantly reduced education and wealth levels. There is likely little or no recovery for the poorest households.  相似文献   
223.
Abstract

Two experiments examined the efficacy of an optional deadline lineup procedure for distinguishing correct from incorrect eyewitness identification decisions. The procedure involved briefly presenting the lineup, removing the lineup from view, then giving participants the option of either making an identification decision or viewing the lineup again. When compared with participants operating under a forced deadline (i.e. forced to respond after the brief presentation) or standard lineup instructions, the optional deadline procedure identified participants with an impressive probability of having made a correct identification when used with target-present lineups and biased instructions. With unbiased instructions, the optional deadline produced clear discrimination between correct and incorrect identification decisions for choosers and, importantly, also for non-choosers. Possible strategies for improving the efficacy of the procedure are suggested.  相似文献   
224.
This article explores the intelligence requirement of international mediation, a topic that is ignored in both the literature on conflict resolution and the literature on intelligence. A mediator's strategies and tactics ought to be informed by a deep understanding of the parties' internal calculations about the conflict and its resolution. Intelligence is needed to gain this understanding because the parties typically do not reveal their sensitive deliberations to outsiders. United Nations mediation teams should have a monitoring and analysis unit that endeavours to meet this need and reduce the ignorance that commonly afflicts international mediation.  相似文献   
225.
The PowerPlex 16 BIO multiplex short tandem repeat (STR) system contains the 13 CODIS loci (FGA, TPOX, D8S1179, vWA, D18S51, D21S11, TH01, D3S1358, CSF1PO, D16S539, D7S820, D13S317, and DS5S818), plus two pentanucleotide repeat loci (Penta D and Penta E) and the sex-identifying locus. Amelogenin. The PowerPlex 16 BIO System is optimized for use with the Hitachi FMBIO gel imaging systems. A consortium of seven independent laboratories collaborated to perform the studies defined by the FBI standards for performing a developmental validation, including the evaluation of sample concordance, percent stutter determination, nonprobative casework, precision, sensitivity, mixture determination, effect of substrates, the impact of environmental insults, and species specificity. All samples tested for concordance were consistent except for one sample from the Virginia Division of Forensic Science database that displayed discordance at D13S317, a locus whose primer sequence was altered. Stutter values were comparable to those of other STR multiplex systems, the precision was comparable to other multiplexes analyzed by gel electrophoresis, the DNA profiles were unchanged by the substrate upon which the blood samples were placed, and the nonprobative casework samples re-typed for the PowerPlex 16 BIO System were consistent with previous typing results. When greater than 0.125 ng of DNA was placed into the PowerPlex 16 BIO System amplification reaction, a full profile was generated by all laboratories. The mixture study results were comparable to those reported for other multiplex systems, the environmental study demonstrated a loss of larger molecular weight loci when samples were incubated at elevated temperatures for a prolonged period of time, and the only notable cross species hybridization was observed with primate DNA samples. This extensive validation work performed demonstrates that the PowerPlex 16 BIO System provides STR data of a quality comparable with other PowerPlex STR multiplex kits as well as other widely used STR multiplexes and is thus suitable for evidentiary casework analysis as well as database sample profiling.  相似文献   
226.
Thornburgh N 《Time》2006,167(22):58-59
  相似文献   
227.
228.
229.
230.
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