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   880篇
  免费   21篇
各国政治   71篇
工人农民   29篇
世界政治   80篇
外交国际关系   60篇
法律   359篇
中国政治   9篇
政治理论   288篇
综合类   5篇
  2023年   5篇
  2022年   3篇
  2021年   4篇
  2020年   6篇
  2019年   24篇
  2018年   21篇
  2017年   25篇
  2016年   28篇
  2015年   16篇
  2014年   20篇
  2013年   175篇
  2012年   21篇
  2011年   22篇
  2010年   23篇
  2009年   25篇
  2008年   33篇
  2007年   18篇
  2006年   29篇
  2005年   26篇
  2004年   33篇
  2003年   30篇
  2002年   22篇
  2001年   24篇
  2000年   17篇
  1999年   16篇
  1998年   17篇
  1997年   16篇
  1996年   13篇
  1995年   15篇
  1994年   13篇
  1993年   18篇
  1992年   11篇
  1991年   10篇
  1990年   9篇
  1989年   13篇
  1988年   12篇
  1987年   11篇
  1986年   9篇
  1985年   9篇
  1984年   10篇
  1983年   6篇
  1982年   5篇
  1981年   6篇
  1979年   3篇
  1978年   5篇
  1976年   2篇
  1975年   3篇
  1974年   2篇
  1972年   3篇
  1969年   4篇
排序方式: 共有901条查询结果,搜索用时 8 毫秒
781.
782.
783.
784.
This paper focuses on interactive innovation. It starts by operationalising Regional Innovation in the context of multi-level governance. It shows how regional and external innovation interaction among firms and other innovation organizations is important for regional innovation potential. The ability to access and use funding for innovation support for regional firms and organizations is crucial for regional innovation promotion. Equity investment funding is more important than public funding, which tends to be cautious and otherwise risk avoiding, except in circumstances of market arrest or failure to develop. Regional systems of innovation are broader than single sectors or clusters but some of these will be strategically privileged recipients of policy support because of their growth performance or potential, rather than, as in the past, their uncompetitiveness. The paper devotes space to exploring biotechnology clustering from a regional innovation systems viewpoint, as an instance of rather strong sectoral, regional innovation systems capabilities, though integrated also to global knowledge supply and markets. Illustration is provided of the way such sectoral innovation systems work at local regional level by reference to cases from Cambridge, Massachusetts and Cambridge, England.  相似文献   
785.
There were 13,176 roadside drug tests performed in the first year of the random drug-testing program conducted in the state of Victoria. Drugs targeted in the testing were methamphetamines and Δ9-tetrahydrocannabinol (THC). On-site screening was conducted by the police using DrugWipe®, while the driver was still in the vehicle and if positive, a second test on collected oral fluid, using the Rapiscan®, was performed in a specially outfitted “drug bus” located adjacent to the testing area. Oral fluid on presumptive positive cases was sent to the laboratory for confirmation with limits of quantification of 5, 5, and 2 ng/mL for methamphetamine (MA), methylenedioxy-methamphetamine (MDMA), and THC, respectively. Recovery experiments conducted in the laboratory showed quantitative recovery of analytes from the collector. When oral fluid could not be collected, blood was taken from the driver and sent to the laboratory for confirmation. These roadside tests gave 313 positive cases following GC–MS confirmation. These comprised 269, 118, and 87 cases positive to MA, MDMA, and THC, respectively. The median oral concentrations (undiluted) of MA, MDMA, and THC was 1136, 2724, and 81 ng/mL. The overall drug positive rate was 2.4% of the screened population. This rate was highest in drivers of cars (2.8%). The average age of drivers detected with a positive drug reading was 28 years. Large vehicle (trucks over 4.5 t) drivers were older; on average at 38 years. Females accounted for 19% of all positives, although none of the positive truck drivers were female. There was one false positive to cannabis when the results of both on-site devices were considered and four to methamphetamines.  相似文献   
786.
Wahlen in Europa     
Ohne Zusammenfassung
Wahlen in Europa
  相似文献   
787.
A long-running debate about how voters use issues to evaluate candidates pits the proximity theory of voting against directional theory. Using surveys, both sides of the debate have found support for their preferred theory, but disagreement remains because of differing ways of analyzing the data. Lewis and King (2000) point out that these researchers make assumptions that bias results in favor of their theory. To avoid these difficulties, our approach creates fictitious candidates with controlled positions, presents these candidates to randomly-assigned subjects, and examines the relationship between subjects’ evaluations of these candidates and their ideological beliefs as a neutral test of proximity and directional theory. Our results provide reasonably strong support for proximity theory but little for directional theory.  相似文献   
788.
789.
This article reviews proposals regarding the recent food crisis in the context of a broader, threshold debate on the future of agriculture and food security. While the MDGs have focused on eradicating extreme poverty and hunger, the food crisis pushed the hungry over the one billion mark. There is thus a renewed focus on agricultural development, which pivots on the salience of industrial agriculture (as a supply source) in addressing food security. The World Bank's new 'agriculture for development' initiative seeks to improve small-farmer productivity with new inputs, and their incorporation into global markets via value-chains originating in industrial agriculture. An alternative claim, originating in 'food sovereignty' politics, demanding small-farmer rights to develop bio-regionally specific agro-ecological methods and provision for local, rather than global, markets, resonates in the IAASTD report, which implies agribusiness as usual 'is no longer an option'. The basic divide is over whether agriculture is a servant of economic growth, or should be developed as a foundational source of social and ecological sustainability. We review and compare these different paradigmatic approaches to food security, and their political and ecological implications.  相似文献   
790.
Much of the extant literature regarding women in policing focuses on job stress, perceptions of job performance, and inherent difficulties associated with their immersion in a traditionally male-dominated profession. Little attention, however, has been given to perceptions regarding gender and backup preferences among police officers. This study sought to examine the impact of professional and demographic characteristics of municipal police officers in a southern state on preferences for male police officers as backup. Multivariate analysis indicated that gender, partner status, race, and marital status significantly impacted officer preferences for male backup. However, further examination of the interaction effect between gender and partner status revealed a gap in the preferences for officers with no partners. Although officers with no partners reported lower overall preferences for male backup than officers with female or male partners, the disparity of preference between male and female officers with no partners was sizeable.  相似文献   
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