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   503篇
  免费   10篇
各国政治   22篇
工人农民   2篇
世界政治   23篇
外交国际关系   14篇
法律   409篇
中国政治   5篇
政治理论   36篇
综合类   2篇
  2019年   5篇
  2018年   7篇
  2017年   9篇
  2016年   6篇
  2015年   4篇
  2014年   9篇
  2013年   22篇
  2012年   6篇
  2011年   9篇
  2010年   6篇
  2009年   11篇
  2008年   9篇
  2007年   15篇
  2006年   15篇
  2005年   18篇
  2004年   8篇
  2003年   14篇
  2002年   10篇
  2001年   31篇
  2000年   20篇
  1999年   21篇
  1998年   5篇
  1997年   12篇
  1996年   3篇
  1995年   8篇
  1994年   3篇
  1992年   8篇
  1991年   11篇
  1990年   12篇
  1989年   16篇
  1988年   16篇
  1987年   9篇
  1986年   16篇
  1985年   16篇
  1984年   12篇
  1983年   4篇
  1982年   3篇
  1981年   15篇
  1980年   4篇
  1979年   7篇
  1978年   7篇
  1977年   8篇
  1976年   4篇
  1975年   10篇
  1974年   12篇
  1973年   11篇
  1972年   3篇
  1971年   4篇
  1970年   3篇
  1964年   2篇
排序方式: 共有513条查询结果,搜索用时 15 毫秒
191.
The files of 874 fatal traumatic accident victims, aged 12-25 years, examined at the Wayne County Medical Examiner's Office during the period 1978-1988 were reviewed. Postmortem blood alcohol results of individuals who died after less than 15 min of hospitalization were utilized to approximate alcohol levels at the time of the fatal injury. Relationships between types of accidents, sex, age, race, and time of accident were examined. White victims were far more likely to have been drinking than blacks, and the data indicated that underaged drinkers were involved in fatal accidents at lower levels of blood alcohol than their counterparts of legal drinking age. Consistent racial differences in average alcohol levels were not observed, however. Unlike female and black victims, who much less frequently tested positive for alcohol when underage, white male victims 16-21 years of age were just as likely to have been drinking as those aged 21-25. The results of the study show that postmortem blood alcohol level can be used to identify differences in alcohol consumption among groups of accident victims in a major metropolitan area.  相似文献   
192.
193.
194.
195.
This study investigated the effect of soft tissue and different exposure times on the prediction of burning temperatures of bone when using Fourier transform infrared spectroscopy (FTIR). Ovis aries rib bones were burnt at different temperatures and for varying time intervals. Results of a linear regression analysis indicated that burn temperatures can be predicted with a standard error of ±70°C from defleshed bone spectra. Exposure time does not have a significant impact on prediction accuracy. The presence of soft tissue has a significant impact on heat‐induced changes of the bone matrix in low (<300°C) as well as high temperatures (>800°C), slowing down combustion in the former and accelerating it in the latter (p < 0.05). At medium temperatures, no significant difference was noted. These results provide forensic investigators a new perspective with which to interpret the results of crystallinity measures derived from burnt bone.  相似文献   
196.
Allele distributions for the nine STR loci included in the AmpFlSTR Profiler Plus kit were evaluated in a Thai population of 300 unrelated individuals.  相似文献   
197.
Economic Change and Restructuring - In this study, we examine the behaviour of unemployment in Nigeria using fractional integration &amp; fractional cointegration techniques. Based on the...  相似文献   
198.
This article examines the displacement of the majority of Crete's Muslim population after an upheaval led to the establishment of an autonomous regime on the island in 1898, following the military intervention by a coalition of European powers (Britain, France, Italy and Russia). By drawing a connection between Cretan topography and the type of intervention, I argue that the coalition's policies played a central role in Muslim emigration from the greatest Ottoman island. The article highlights the sectarian lens through which the European decision-makers regarded relations between the island's Christian and Muslim populations. In so doing, it makes a contribution to the history of European intervention in the Ottoman Empire. The final section offers a glimpse into the diminished Muslim minority under the autonomous regime, which was established after Abdülhamid II withdrew his soldiers from Crete, signifying de facto termination of Ottoman sovereignty on the island.  相似文献   
199.
As environmental regulations increase, industry associations play a growing role in representing their respective members. This role has been documented in many industrialized countries but less so in emerging economies. In this study, we investigate the level of corporate environmentalism exhibited by member firms of two industry associations operating in Trinidad and Tobago. Using a two-stage Heckman regression that corrects for the endogeneity introduced by self-selection bias in the evaluation of voluntary choices, our findings indicate that firms that are members of the foreign-originated American Chamber of Commerce of Trinidad and Tobago appear to show stronger corporate environmentalism than those belonging to the locally formed Chamber of Commerce. Enhanced institutional pressures from these respective industry associations, peers and competitors within associations, access and exposure to best practices, networking opportunities and service bundling may explain these differences. These results suggest that environmental policy makers in emerging economies may be able to leverage foreign-originated industry associations to promote stronger corporate environmentalism. Policy makers may need to consider how to encourage local chambers to emulate the some of the institutional conditions of foreign-originated ones.  相似文献   
200.
This article examines gender differences in the incidence of rural to urban migration in developing countries, particularly those of Sub‐Saharan Africa. The study distinguishes itself from current migration literature by suggesting that the gain in returns to observable attributes, as a result of migration, may differ by gender and could provide an explanation for gender differences in migration. Using data from Kenya, we estimate the urban‐to‐rural wage gap, separately for each gender, and decompose the gap into the components due to urban to rural differences in observable attributes and differences in returns to observable attributes. We find that the portion of the wage gap that is due to the gain in returns to observable attributes is larger for males, suggesting that males receive larger monetary returns as a result of migration and, consequently, have greater incentive to migrate to urban areas.  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