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   461篇
  免费   21篇
各国政治   26篇
工人农民   44篇
世界政治   39篇
外交国际关系   27篇
法律   218篇
中国政治   6篇
政治理论   115篇
综合类   7篇
  2023年   7篇
  2022年   2篇
  2021年   3篇
  2020年   13篇
  2019年   15篇
  2018年   21篇
  2017年   17篇
  2016年   25篇
  2015年   12篇
  2014年   16篇
  2013年   64篇
  2012年   12篇
  2011年   7篇
  2010年   13篇
  2009年   13篇
  2008年   16篇
  2007年   19篇
  2006年   14篇
  2005年   9篇
  2004年   12篇
  2003年   11篇
  2002年   16篇
  2001年   10篇
  2000年   10篇
  1999年   8篇
  1998年   9篇
  1997年   7篇
  1996年   6篇
  1995年   7篇
  1994年   3篇
  1993年   3篇
  1992年   4篇
  1991年   5篇
  1990年   5篇
  1989年   4篇
  1988年   4篇
  1987年   7篇
  1986年   5篇
  1985年   2篇
  1984年   6篇
  1983年   6篇
  1982年   2篇
  1981年   5篇
  1980年   2篇
  1979年   4篇
  1973年   2篇
  1971年   2篇
  1969年   2篇
  1968年   6篇
  1966年   3篇
排序方式: 共有482条查询结果,搜索用时 15 毫秒
81.
The Trade and Tariff Act of 1984 includes a new measure, country graduation, designed to shift a greater share of the benefits of the US Generalized System of Preferences (GSP) from the more advanced developing countries to poorer beneficiary countries. This note presents estimates of the effects of graduating Hong Kong, South Korea, Singapore and Taiwan on the poorest countries of Africa. Our results show that the removal of these four countries will do little to increase the GSP benefits of the African beneficiary countries.  相似文献   
82.
This study investigated and evaluated the safety margins of the continuous long duration (up to 30 min) effect of the TASER X26 waveform, using a Sus scrofa model. Long duration continuous stimulus has not been evaluated on humans or human surrogates prior to this study. Swine were used as models due to similarities with humans in their skin and cardiovascular systems. Very long duration was used to determine both exposure dose and possible adverse physiological effects of dose. The trial began with an application of 10 min, and subsequent animals received increasing exposure time up to a survived maximum duration of 30 min. At the onset of this work, it was hypothesized that there would be a time limit after which most animals would not survive consistent with increased dose response. However, this hypothesis was not supported by the experimental results. All animals (10 of 10) survived up to 3 min. Seven of the 10 animals survived up to a 10‐min exposure and 3 of 5 animals with a 30‐min target exposure survived the full exposure. Surviving animals were recovered and observed for 24 h, with no postrecovery deaths. This suggests that swine (based on physiology) will not experience a fatal event when exposed to the TASER X26 for a continuous 3 min. Conclusions regarding longer duration (10–30 min) are not as certain due to the small sample sizes at these time intervals.  相似文献   
83.
The study of referendum voting follows much the same format as for general election voting. Influences on vote, however, are likely to differ significantly. Referendums decide issues, while general elections determine which party or parties will form the government. Parties are often divided on referendum issues and these issues tend to be of low salience. General elections, however, are contested by long-established parties on highly salient issues. Using panel data from the British Election Study and the 2011 Alternative Vote Referendum Study, we find that voters place different weights on party identification, issue positions, government and leader evaluations when voting in general elections and referendums, but the evidence for differential campaign effects is limited.  相似文献   
84.
85.
According to biomechanics of fracture production during blunt impact, tubular bones are subject to compressive (impact site) and tensile (opposite impact site) forces; this causes bones to break in tension before compression, producing Y-shaped fracture patterns with breakaway (butterfly) fragments. In current forensic models, the side of the bone exhibiting the breakaway fragment is designated the impact side, with initial breakage occurring opposite. Fracture production and patterning of blunt impacts to 255 sheep femora were analyzed. Contra the existing model, only 60% of complete butterfly fractures exhibited impact side breakaway fragments. Although fractures initiated on the tension, nonimpact side, butterfly fragments formed on either compression or tension sides. Using newly defined breakaway fragment shape criteria, impact side was estimated with 98% accuracy for both complete and partial butterfly fractures. Furthermore, the results suggest that the impact site is the located on one of the Y-fracture's arms, not the butterfly fragment's center, as previously modeled.  相似文献   
86.
Puerperal insanity has attracted significant academic attention in cases of Victorian child killing when mothers killed their young children. This article expands the focus of the puerperal insanity narratives in order to address how, or whether these discourses influenced the wider realm of female insanity. By using the Constance Kent case as an exemplar the article explores how medical and legal ‘tests’ translated into a social conception of female insanity. The preponderance of press reports and the decisions reached suggest insanity came to be a ready social answer when women killed children.  相似文献   
87.
Geographic location, time of reporting and need for rapid evaluation contributed to a lack of intelligence concerning a suspect burial site in scrub woodland (~15 km from the last known location of a missing person) in Northern Ireland. Police received reports of a subsiding ‘grave’, which was evaluated positively using GPR and victim recovery dogs (VRD). After 24 h work, archaeological excavation showed a vertical-sided, stepped excavation on undisturbed clay with no inhumation. Subsequent research showed the feature to be an engineering trial pit. The GPR response was a water table and rocks, VRD were possibly reacting to disturbed ground. The work serves as a demonstration of good archaeological practice in suspect burial excavation, following a lack of landscape evaluation and poor overall intelligence.  相似文献   
88.
Current standards for age at death estimation from the pelvis are based on Americans of European and African ancestry. Our limited understanding of population variability hampers our efforts to apply these techniques to the various skeletal populations around the world, especially in global forensic contexts. However, documented skeletal samples are rare, limiting our ability to test our techniques. This study tested the Suchey-Brooks pubic symphysis aging method and the auricular surface method originally developed by Lovejoy et al. on a large sample (n = 404) of known sex and age from the Sassari Collection, housed at the Museum of Anthropology at the University of Bologna, Italy. The results indicate that for both methods, bias and inaccuracy increased with age and actual age tended to be underestimated over the age of 40. The auricular surface method performed slightly better, exhibiting slightly lower levels of bias and inaccuracy, especially for males.  相似文献   
89.
90.
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