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   2047篇
  免费   118篇
各国政治   130篇
工人农民   90篇
世界政治   162篇
外交国际关系   138篇
法律   930篇
中国政治   12篇
政治理论   666篇
综合类   37篇
  2023年   16篇
  2022年   18篇
  2021年   21篇
  2020年   69篇
  2019年   71篇
  2018年   79篇
  2017年   114篇
  2016年   98篇
  2015年   68篇
  2014年   73篇
  2013年   250篇
  2012年   91篇
  2011年   83篇
  2010年   75篇
  2009年   77篇
  2008年   88篇
  2007年   77篇
  2006年   69篇
  2005年   66篇
  2004年   66篇
  2003年   50篇
  2002年   56篇
  2001年   41篇
  2000年   33篇
  1999年   29篇
  1998年   32篇
  1997年   16篇
  1996年   23篇
  1995年   26篇
  1994年   20篇
  1993年   14篇
  1992年   17篇
  1991年   24篇
  1990年   20篇
  1989年   14篇
  1988年   13篇
  1987年   15篇
  1986年   17篇
  1985年   18篇
  1984年   16篇
  1983年   7篇
  1982年   16篇
  1981年   7篇
  1980年   16篇
  1979年   9篇
  1977年   6篇
  1973年   4篇
  1972年   4篇
  1967年   5篇
  1966年   4篇
排序方式: 共有2165条查询结果,搜索用时 0 毫秒
911.
912.
913.
914.
915.
There is abundant evidence that research collaboration has become the norm in every field of scientific and technical research. We provide a critical overview of the literature on research collaboration, focusing particularly on individual-level collaborations among university researchers, but we also give attention to university researchers’ collaborations with researchers in other sectors, including industry. We consider collaborations aimed chiefly at expanding the base of knowledge (knowledge-focused collaborations) as well as ones focused on production of economic value and wealth (property-focused collaborations), the latter including most academic entrepreneurship research collaborations. To help organize our review we develop a framework for analysis, one that considers attributes of collaborators, collaborative process and organization characteristics as the affect collaboration choices and outcomes. In addition, we develop and use a “Propositional Table for Research Collaboration Literature,” presented as an “Appendix” to this study. We conclude with some suggestions for possible improvement in research on collaboration including: (1) more attention to multiple levels of analysis and the interactions among them; (2) more careful measurement of impacts as opposed to outputs; (3) more studies on ‘malpractice’ in collaboration, including exploitation; (4) increased attention to collaborators’ motives and the social psychology of collaborative teams.  相似文献   
916.
Abstract

Several laboratory studies have shown that eyewitness discussions can negatively affect memory recall. The current study looked at the prevalence of multiple witnesses using real witnesses at a UK identification suite. We investigated the frequency of co-witness discussion, what the co-witnesses tended to discuss and whether there was an association between this information, and the outcome of the identification. Sixty witnesses at the Force Identification Unit in Brighton (UK) filled out a questionnaire following the identification procedure. Co-witnesses were reported by 88% of the sample, with the average number of co-witnesses being 4.02 (SD=6.52). In addition, 58% of the multiple witnesses had discussed the criminal event with at least one co-witness. The most common areas of discussion were ‘general crime details’ (52%) and ‘suspect details’ (39%). The implications of these findings are discussed.  相似文献   
917.
Abstract

The principal aim of this study was to investigate whether attitudes towards judicial competency, legal liability, voluntariness of offence and judicial disposal options were influenced by known classification of an offender as learning disabled compared to an offender with a suggested intellectual disability, but not formally classified. Subsidiary aims were to explore participant attitudes based upon group membership and parental status. The sample consisted of 101 participants (69 undergraduate nursing students and 32 from the general population). Participants were requested to complete a questionnaire assessing their attitudes within the aforementioned domains and towards ascribed levels of victim parental responsibility. Fifty participants completed a questionnaire designed for the purpose of the study where the offence scenario depicted made reference to the offender having a formal classification of learning disability. Fifty-one participants completed the same questionnaire where an intellectual disability was suggested but not formally stated in the form of classification. Results indicated that classification did significantly influence attitudes in most domains irrespective of group. The nursing group attributed greater levels of competency to the offenders depicted. No interactions between variables were observed. The reasons for and implications of these findings, limitations and recommendations for future research are explored.  相似文献   
918.
Adoption of modern agricultural inputs in Africa remains low, restraining agricultural productivity and poverty reduction. Low quality agricultural inputs may in part explain low adoption rates, but only if farmers are aware that some inputs are low quality. We report the results of laboratory tests of the quality of glyphosate herbicide in Uganda and investigate whether farmers’ beliefs about the prevalence of counterfeiting and adulteration are consistent with the prevalence of low quality in their local market. We find that the average bottle in our sample is missing 15 per cent of the active ingredient and 31 per cent of samples contain less than 75 per cent of the ingredient advertised. Farmers believe 41 per cent of herbicide is counterfeit or adulterated. Beliefs are significantly correlated with quality at the local market level, but beliefs remain inaccurate, adjusting for only a fraction of actual differences in quality. Price is also significantly correlated with quality in local markets, but prices also adjust for only a fraction of quality differences. Although, like fertiliser and hybrid maize seed, herbicide in Uganda is low quality, herbicide use is substantially higher.  相似文献   
919.
The Union of South American Nations, unasur, has, since its beginnings, stood out as an effective player in international conflict resolution and mediation. In order to achieve said resolution and mediation, this multilateral organization has appealed to different political configurations which allow for a channeling of conflicts which do not conform to institutional patterns and traditional resolutions. Despite its preference for alternate forms of resolution, presidential summits have worked as its main resource in the search for innovative solutions that are respectful of South American countries’ democratic and constitutional order. This article specifically analyzes two cases of profound institutional problems: the failed coup d’état in Ecuador (which occurred on the 30th of September 2010) and the overthrow of Paraguayan president Fernando Lugo in June 2012. After studying these two extreme cases, and their political reverberations, a comprehensive view is laid out regarding unasur’s successes and failures as a player in international conflict resolutions.  相似文献   
920.
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