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   797篇
  免费   52篇
各国政治   66篇
工人农民   35篇
世界政治   80篇
外交国际关系   70篇
法律   365篇
中国政治   1篇
政治理论   223篇
综合类   9篇
  2023年   3篇
  2022年   4篇
  2021年   9篇
  2020年   16篇
  2019年   25篇
  2018年   33篇
  2017年   41篇
  2016年   36篇
  2015年   39篇
  2014年   27篇
  2013年   119篇
  2012年   31篇
  2011年   35篇
  2010年   18篇
  2009年   39篇
  2008年   41篇
  2007年   39篇
  2006年   41篇
  2005年   33篇
  2004年   29篇
  2003年   23篇
  2002年   21篇
  2001年   17篇
  2000年   17篇
  1999年   7篇
  1998年   7篇
  1997年   15篇
  1996年   6篇
  1995年   4篇
  1994年   6篇
  1993年   2篇
  1992年   8篇
  1991年   5篇
  1990年   3篇
  1989年   5篇
  1988年   4篇
  1987年   3篇
  1986年   2篇
  1985年   3篇
  1984年   3篇
  1983年   3篇
  1982年   4篇
  1981年   2篇
  1979年   2篇
  1978年   2篇
  1977年   4篇
  1973年   4篇
  1968年   1篇
  1967年   1篇
  1966年   1篇
排序方式: 共有849条查询结果,搜索用时 31 毫秒
841.
The rise of India and the EU as global actors has sparked growing interest in their peace-building approaches. This paper compares the objectives and effects of the EU's and India's engagement in different conflict contexts within and alongside their borders. It examines whether their practices of conflict resolution or peace-building strive for more than conflict management or ‘governmentality’. This article asks whether there is sufficient consistency across either actors' governance interventions to even speak of a distinct ‘strategy’ or ‘governance culture’. It illustrates the close relationship between governance and conflict response initiatives but finds that the relationship is often dysfunctional.  相似文献   
842.
Electronic control devices (ECDs) deliver high‐voltage, low‐current energy pulses temporarily paralyzing a person. For the ECD–human interaction, we have developed a computer model using the SEMCAD program within which to simulate the electrical effects throughout the body resulting from the imposition of an ECD pulse at a particular point on the body surface. Our human body models were based on cross‐sectional MRIs and CT scans, with the dielectric properties of the various tissues assigned based on previously published values. We simulated the application of a single ECD pulse and calculated the resulting electric field strength and current and charge densities at different body locations. The results were compared with corresponding values obtained by other researchers in similar simulations. Furthermore, we simulated an application of a pulse of 20‐millisecond duration equal to the European household current of 50 Hz and to the ventricular fibrillation threshold. The resulting current level indicated at the heart muscle was 1/5 the level considered the threshold for triggering ventricular fibrillation.  相似文献   
843.
Between 1998 and 2001 the deaths of 16 Surinamese children were recorded along the Maroni River, which forms the border between Suriname and French Guyana. After a metabolic origin was eliminated, ethnobotanical research in the field led to a hypothesis of intoxication through the ingestion of ackee. Ackee (Blighia sapida) is a large green leafy tree of West African origin. Its unripe fruit contains large quantities of two toxic molecules: hypoglycin-A and hypoglycin-B, the former being the more toxic. We have developed a GC-MS procedure allowing us to demonstrate the presence of hypoglycin-A in the gastric fluid of one of the deceased children, and to compare the content of hypoglycin-A in fruit collected on the road to Paramaribo in Suriname (5.1mg/g) with samples from Burkina Faso (8.1mg/g) and Jamaica (9.2mg/g). Field research showed the misuse of this little-known plant by Maroon witch doctors. The Bushinengue witch doctors were informed about the dangers of ackee, and no new cases have been reported to date.  相似文献   
844.
Segmental analysis of hair for drugs, metabolites, and poisons has been widely reported in the scientific literature over the past two decades. Two fundamental assumptions in interpreting results of such analyses are (1) an average linear growth rate of head hair of 1cm/month and (2) that sample collections occur with the hair being cut directly next to the scalp. The purpose of this study was to evaluate the variability associated with growth rate of human head hair, as well as the ability to uniformly collect hair next to the scalp. The results were used to determine how these factors affect the interpretation of results generated in segmental analysis of hair. A thorough literature review was conducted to assess the range of linear growth of human head hair from the vertex posterior and occipital regions. The results were compiled to establish the average (1.06cm/month), as well as the range of possible growth rates of head hair. The range was remarkable and suggests that conclusions based on the 1-cm/month growth rate could be significantly skewed. A separate study was undertaken to evaluate collection of hair next to the scalp. Fourteen individuals were provided oral instructions, as well as a written standard collection procedure for head hair. The experience levels among the collectors varied from novice to expert. Each individual collected hair from dolls with short- and long-hair. Immediately following each collection, the sampling area was evaluated to determine how close to the scalp the cuts were made, as well as the variability in the lengths of hair remaining at the sampled area. From our collection study, we determined that 0.8±0.1cm of hair was left on the scalp after cutting. When taking into account the amount of hair left on the scalp after collecting, the use of a growth rate of 1.06cm/month, and the assumption that it takes two weeks for newly formed hair in the follicle to reach the scalp, we find that the first 1-cm segment of hair typically corresponds to hair formed 1.3±0.2 to 2.2±0.4 months (95% confidence) earlier. The impact of these findings as it relates to the corresponding time for each additional segment is demonstrated. As a result, we recommend that hair collection be delayed 8 weeks after a suspected ingestion to ensure that the sample fully represents the exposure period. The results of this study suggest that the variability in the growth rate of human head hair, as well as the inconsistent collection of hair, significantly affect the interpretation of results from segmental analysis of hair.  相似文献   
845.
846.
Settlement and trial expenditures are crucially interrelated. The literature on settlement, however, takes no account of models of trial. In this paper, we develop a unified model of settlement and trial expenditures. We do this by discarding the usual assumption of settlement models that trial costs are constant across cases. Instead, we follow the literature on trial by permitting trial costs to vary with the legal merit of the plaintiff's case. Our approach can be used to extend standard models of settlement such as the well-known Priest–Klein model as well as models based on asymmetric information. As a demonstration, we extend the Priest–Klein model and generally overturn that model's canonical results. In particular, we show that even in a fully symmetric model, predicted win rates at trial can deviate substantially from 50 percent. Furthermore, win rates will vary in response to legal reforms that shift the decision standard.  相似文献   
847.
848.
849.
The reorganization of governments is crucial for parties to express their policy preferences once they reach office. Yet these activities are not confined to the direct aftermath of general elections or to wide-ranging structural reforms. Instead, governments reorganize and adjust their machinery of government all the time. This paper aims to assess these structural choices with a particular focus at the core of the state, comparing four Western European democracies (Germany, France, the Netherlands, and United Kingdom) from 1980 to 2013. Our empirical analysis shows that stronger shifts in cabinets' ideological profiles in the short- and long-term as well as the units' proximity to political executives yield significant effects. In contrast, Conservative governments, commonly regarded as key promoters of reorganizing governments, are not significant for the likelihood of structural change. We discuss the effects of this politics of government reorganization for different research debates assessing the inner workings of governments.  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