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   274篇
  免费   11篇
各国政治   9篇
工人农民   18篇
世界政治   28篇
外交国际关系   8篇
法律   173篇
政治理论   49篇
  2022年   3篇
  2020年   3篇
  2019年   8篇
  2018年   7篇
  2017年   5篇
  2016年   8篇
  2015年   3篇
  2013年   25篇
  2012年   7篇
  2011年   11篇
  2010年   9篇
  2009年   13篇
  2008年   17篇
  2007年   9篇
  2006年   6篇
  2005年   6篇
  2004年   9篇
  2003年   5篇
  2002年   3篇
  2001年   6篇
  2000年   4篇
  1999年   5篇
  1998年   4篇
  1996年   4篇
  1993年   3篇
  1992年   5篇
  1991年   4篇
  1990年   2篇
  1989年   4篇
  1988年   3篇
  1987年   4篇
  1986年   4篇
  1985年   6篇
  1984年   5篇
  1983年   3篇
  1982年   2篇
  1981年   3篇
  1980年   4篇
  1979年   4篇
  1977年   5篇
  1976年   5篇
  1975年   4篇
  1974年   2篇
  1973年   3篇
  1972年   4篇
  1971年   3篇
  1970年   2篇
  1968年   2篇
  1967年   3篇
  1966年   3篇
排序方式: 共有285条查询结果,搜索用时 15 毫秒
131.
132.
In the autumn of 1962, two weeks before U-2 aerial photographs confirmed Soviet deployments of nuclear missiles in Cuba, the US intelligence community attempted to image the island with the spy satellite Corona. Insufficient image resolution and extensive cloud cover, however, prevented this photography from providing solid evidence confirming or denying the presence of offensive missiles. This event – previously unaddressed either by Missile Crisis or Corona scholars – illustrates both the promise and the limits of early satellite imagery intelligence. It further provides insight into the early imagery tasking and coordination process and demonstrates needs that drove further development of national satellite reconnaissance in the years that followed.  相似文献   
133.
Trends in the rate of victimizations of juveniles in three settings-schools, homes, and streets/parks-are examined monthly during the period 1974–1981. The relationship between in-school victimization rates and those occurring outside of school are analyzed with multivariate ARMA models informed by previous research on school victimization (Gottfredson and Gottfredson, 1985) and an importation perspective on the source of crime and victimization in institutions such as schools. Results indicate that the overall in-school victimization rate remained relatively stable during this period but that victimization rates of juveniles in other settings had significant effects on in-school victimizations. This suggests that underlying causes of victimization in general are important determinants of victimization in schools. These results are limited, however, as we examine these sources of victimization only indirectly via relationships among the different victimization rates in dynamic models and by the aggregate nature of the monthly data from the National Crime Survey.  相似文献   
134.
135.
136.
137.
The increase in both automation and precision in the analysis of geological materials has had significant impact upon forensic investigations in the last 10 years. There is however, a fundamental philosophical difference between forensic and geological enquiry. This paper presents the results of forensic geoscientific investigations of three cases of wildlife crime. Two cases involve the analysis of soils recovered after incidents of illegal badger baiting in the United Kingdom. The third case involves the illegal importation of Eleonora's Falcon (Falco eleonorae) into the United Kingdom from the Mediterranean. All three cases utilise the analysis of soils by a variety of physical, chemical and biological techniques. These involve mineral and grain size analyses, cation and anion compositions, pH, organic content and pollen analysis. The independent analysis undertaken by specialists in each of these three main fields conclude firstly, that there is a significant similarity between sediments taken at the crime site at both badger setts and with sediments recovered from various spades, shovels and clothing belonging to suspects and secondly, that the soils analysed associated with the removal of the falcon eggs in the Mediterranean contained characteristics similar in many respects to the soils of the breeding areas of F. eleonorae on the cliffs of Mallorca. The use of these independent techniques in wildlife crime detection has great potential given the ubiquitous nature of soils and sediments found in association with wildlife sites.  相似文献   
138.
139.
This paper argues that groups have traditionally been conceptualized in two major ways—subjective and objective—which correspond to the different conceptions found within the disciplines of psychology and sociology. We argue that the term group is frequently used too carelessly since rarely are readers informed of the conception of group to which the findings are relevant. Findings generated from studies involving one conception of group may not allow valid inferences to groups conceptualized differently. We suggest that a more sociological conception of group is needed to balance the current emphasis based in the psychological tradition. We believe that such a difference in conceptualizing groups could well lead to very different speculations about the nature of intergroup justice relations.  相似文献   
140.
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