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   277篇
  免费   8篇
各国政治   25篇
工人农民   34篇
世界政治   21篇
外交国际关系   29篇
法律   102篇
中国政治   2篇
政治理论   72篇
  2023年   1篇
  2022年   4篇
  2021年   2篇
  2020年   5篇
  2019年   11篇
  2018年   15篇
  2017年   14篇
  2016年   10篇
  2015年   9篇
  2014年   14篇
  2013年   50篇
  2012年   9篇
  2011年   11篇
  2010年   9篇
  2009年   10篇
  2008年   5篇
  2007年   8篇
  2006年   13篇
  2005年   3篇
  2004年   7篇
  2003年   12篇
  2002年   5篇
  2001年   2篇
  2000年   1篇
  1998年   2篇
  1997年   1篇
  1996年   2篇
  1995年   3篇
  1994年   2篇
  1993年   3篇
  1992年   4篇
  1991年   4篇
  1989年   2篇
  1988年   2篇
  1987年   1篇
  1986年   1篇
  1985年   3篇
  1984年   4篇
  1983年   6篇
  1982年   2篇
  1981年   2篇
  1980年   1篇
  1979年   4篇
  1978年   2篇
  1977年   1篇
  1976年   1篇
  1974年   2篇
排序方式: 共有285条查询结果,搜索用时 31 毫秒
41.
42.
43.
Brain, liver, rectal and environmental temperatures were continuously monitored under controlled conditions, in 117 forensic fatalities, for up to 60 h after death. Cases were studied either naked (63%) or covered with two blankets (37%). Bodies were classified into fat and thin groups. Statistical analysis and curve-fitting of the data yielded the average triple-exponential formulae for each body site and each body group. The effects of covering of the torso and body parameters such as weight, height, surface area and 'cooling size factor' (Z) on postmortem cooling are assessed and discussed. Results show that covering of the torso has a significant influence on the rate of postmortem cooling, however, there is no good correlation between the body variables and the cooling rate.  相似文献   
44.
The temperatures of three body sites, namely, the brain, liver and the rectum as well as the temperature of the environment were continuously monitored, every 5-10 min, in 117 forensic cases commencing soon after death and in most cases, within 45 min postmortem. The body temperature at the moment of death was empirically determined by a computer-based extrapolation method. Thus, temperature data for the first 3h of each body site were fitted to single-exponential equations and the fitted curve was extrapolated backwards to obtain the intercept on the Y-axis (the temperature axis). The effect of body temperature at the moment of death on postmortem cooling rate is examined and factors influencing body temperature at death are discussed. Forensic fatalities associated with hyper and hypothermia are reviewed briefly.  相似文献   
45.
Ammonium nitrate fuel oil is an explosive mixture found in most antipersonnel landmines (APL) buried throughout the Colombian territory. During more than 50 years of internal conflict, the Colombian government has found that trained dogs are the most effective method to detect APL. However, the olfactive signature in ANFO is unknown and also if there are differences in detection related to the explosive manufacturing origin. Therefore, this work begins with the analytical validation of the method used to determine ammonia, in its derivatized form as carbamate, released by home-made ANFO using HS-SPME-GC-FID. Once validated, the method was used to identify ammonia and other organic volatile compounds present in ANFO, under laboratory and simulated field conditions. The validation process includes the evaluation of the optimum conditions for the derivation and extraction of butylcarbamate, the determination of the working ranges with linear response in FID, the limits of detection and quantification, the sensitivity, and the precision. The results of the validation established linearity and sensitivity in a concentration between 20 and 120 mg/L, as well as low limits of detection and quantification of 6.4 and 21.4 mg/L, respectively. Also, an intermediate precision of 11% for butylcarbamate with a repeatability of 8%. The validated method showed in real samples of home-made ANFO besides ammonia, the presence of low molecular methylamines, and also exhibited differences in volatile compositions according to the origin. The objective of this work is to offer a reliable analytical methodology for the extraction and analysis of volatile compounds from ANFO.  相似文献   
46.
Thomas  Diana W.  Thomas  Michael D. 《Public Choice》2020,182(3-4):443-457

The Olsonian distinction between roving and stationary bandits outlines the rationale behind the transition from anarchy to the emergence of the predatory state. This two-bandit model may, however, be expanded to include more bandit types. In the case of Viking Age England, local English kings were unable to monopolize violence and defend their realms against competing Viking raiders. As the Vikings’ time horizon grew, so did the accumulated value of more formal taxation, and bandit types evolved in four steps. The first step is the Olsonian roving bandit, who executed Viking hit-and-run attacks and plunders during the second half of the tenth century. The second step is the gafol bandit; gafol is payment for leaving, paid to, among others, Swein Forkbeard. The third step is the heregeld bandit; heregeld is a tax to support an army for hire; most notably Thorkell the Tall’s. The fourth step is the Olsonian stationary bandit, i.e. the strongest military leader among the Vikings, Cnut the Great, settled down as the new king. Overall, the Olsonian two-bandit model can be expanded to a four-bandit staircase model, in which the new gafol and heregeld bandit types explain the steps from anarchy and short-run raiding to long-run formal taxation in a predatory state.

  相似文献   
47.
The review essay takes stock of the last decade of decentralisation and regionalisation research in Central and South Eastern Europe. Classifying the existing scholarship with regard to its focus of analysis, its explanatory programme, and methodological predilections, we suggest to distinguish three different agendas: system transformation, EU conditionality and subnational governance. We argue that scholarly interest in regionalisation and decentralisation issues from the perspective of state transformation or Europeanisation is vanishing. Instead, we witness the emergence of a subnational governance approach which is rooted in comparative politics and policy analysis. The debate about decentralisation and regionalisation in CEEC is thus in a process of “normalising” and converging with the Western European subnational political discourse.  相似文献   
48.
In this article my principal aims are to explain why the concept of social capital has proven so popular among policy makers and to develop a critical response to it. In order to do so I bring together macro- and micro-level analyses that focus, on the one hand, on broad structural changes associated with globalisation and, on the other, on specific attempts at increasing social capital within the everyday lives of communities. To develop my macro-level analysis I suggest that the conjunction of economic volatility and demographic mobility that has affected the West since the 1970s has made building social capital an attractive option within a more general experiment with new forms of power. My claim here is that building social capital is among a clutch of recent policy initiatives designed to repair the ideological resources of contemporary liberal states, where it is the tearing as well as the weakening of the social fabric that is at stake. I focus on the British case because building social capital has been explicitly highlighted by the UK government as a vehicle for civic renewal. The micro-analysis proceeds by analysing recent surveys and policies undertaken by Camden Council. Micro refers here to local symptoms of global change; to the micro-powers being developed in response and to the local authorities where social capital policies are being operationalised. I associate these with biopolitical and ideological interventions into the very building blocks of the social. Overall, the genealogy of social capital explores how the concept's discursive significance has shifted as it moves from the democratisation literature into the policy arena and becomes entangled in relations of power. In the latter context it examines the impact of concerns about segregation that justify intrusive policies associated with social capital building.  相似文献   
49.
There is limited research that has examined experimentally the effects of muscular images on adolescent boys’ body image, with no research specifically examining the effects of music television. The aim of the current study was to examine the effects of viewing muscular and attractive singers in music video clips on early, mid, and late adolescent boys’ body image, mood, and schema activation. Participants were 180 boys in grade 7 (mean age = 12.73 years), grade 9 (mean age = 14.40 years) or grade 11 (mean age = 16.15 years) who completed pre- and post-test measures of mood and body satisfaction after viewing music videos containing male singers of muscular or average appearance. They also completed measures of schema activation and social comparison after viewing the clips. The results showed that the boys who viewed the muscular clips reported poorer upper body satisfaction, lower appearance satisfaction, lower happiness, and more depressive feelings compared to boys who viewed the clips depicting singers of average appearance. There was no evidence of increased appearance schema activation but the boys who viewed the muscular clips did report higher levels of social comparison to the singers. The results suggest that music video clips are a powerful form of media in conveying information about the male ideal body shape and that negative effects are found in boys as young as 12 years.  相似文献   
50.
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