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   2441篇
  免费   81篇
各国政治   136篇
工人农民   71篇
世界政治   226篇
外交国际关系   549篇
法律   954篇
中国政治   5篇
政治理论   567篇
综合类   14篇
  2023年   10篇
  2022年   13篇
  2021年   15篇
  2020年   28篇
  2019年   41篇
  2018年   49篇
  2017年   58篇
  2016年   72篇
  2015年   54篇
  2014年   89篇
  2013年   411篇
  2012年   111篇
  2011年   141篇
  2010年   125篇
  2009年   119篇
  2008年   100篇
  2007年   118篇
  2006年   103篇
  2005年   98篇
  2004年   111篇
  2003年   92篇
  2002年   78篇
  2001年   27篇
  2000年   38篇
  1999年   28篇
  1998年   22篇
  1997年   26篇
  1996年   22篇
  1995年   21篇
  1994年   23篇
  1993年   14篇
  1992年   14篇
  1991年   16篇
  1990年   20篇
  1989年   12篇
  1988年   16篇
  1987年   18篇
  1986年   14篇
  1985年   11篇
  1984年   9篇
  1983年   10篇
  1982年   20篇
  1981年   12篇
  1979年   12篇
  1978年   11篇
  1975年   6篇
  1974年   6篇
  1971年   6篇
  1970年   8篇
  1969年   9篇
排序方式: 共有2522条查询结果,搜索用时 15 毫秒
51.
This paper shows that since the beginning of the reform period in 1986 the regime in Hanoi has taken great pains to create the image of the state having legitimate and, indeed, heroic security organs that acted as the ‘saviors of the Vietnamese revolution’ and still serve as the ‘shield and sword’ of the Vietnamese Communist Party. I argue that while previously the socialist state used to regard the history of its security organs as top secret, over the last few years, a huge amount of resources have been mobilized to actively propagate a sacred and romanticized image of the security apparatus.  相似文献   
52.
53.
54.
55.
56.
57.
To analyze how Japan's competing objectives and specific policies have been evolving and how they trade off in today's regional security situation, this article argues that shifting Japanese foreign and security policies in Northeast Asia can be understood as ongoing responses to tensions along three key axes. First Japan confronts a tension between bilateralism and multilateralism; second Japan's economic and security interests are often at odds, and third, Japan still struggles with the competing pulls exerted by Asia on the one hand and the West (most particularly the United States) on the other.  相似文献   
58.
59.
This study focuses on the role of public capital stock in contributing to interstate differences in productive efficiency in manufacturing. Our motivation is to assess the role of public capital as a source of persistent regional variations in efficiency, and thus determine if public infrastructure policies might reasonably be expected to alter the competitive environment of a state's manufacturing sector. We use a stochastic frontier production function model, explicitly incorporating infrastructure capital, to examine the relative performance of the aggregate manufacturing sector across states and over time. We calculate an index of productive efficiency and estimate the determinants of statewide variations in it. These results show that variations in per capita infrastructure stocks significantly affect manufacturing efficiency. Considering the behavior of public capital as both a direct and an indirect input furthers our understanding of the role of infrastructure and its implications for regional economic development policies.  相似文献   
60.
Accurate age estimates of immature necrophagous insects associated with a human or animal body can provide evidence of how long the body has been dead. These estimates are based on species-specific details of the insects’ aging processes, and therefore require accurate species identification and developmental stage estimation. Many professionals who produce or use identified organisms as forensic evidence have little training in taxonomy or metrology, and appreciate the availability of formalized principles and standards for biological identification. Taxonomic identifications are usually most readily and economically made using categorical and qualitative morphological characters, but it may be necessary to use less convenient and potentially more ambiguous characters that are continuous and quantitative if two candidate species are closely related, or if identifying developmental stages within a species. Characters should be selected by criteria such as taxonomic specificity and metrological repeatability and relative error. We propose such a hierarchical framework, critique various measurements of immature insects, and suggest some standard approaches to determine the reliability of organismal identifications and measurements in estimating postmortem intervals. Relevant criteria for good characters include high repeatability (including low scope for ambiguity or parallax effects), pronounced discreteness, and small relative error in measurements. These same principles apply to individuation of unique objects in general.

Key points

  • Metrological rigour can increase in forensic entomology by selecting measurements based on their metrological qualities.
  • Selection of high-quality features for morphological identification of organisms should consider these criteria: (1) pronounced discreteness of features (minimising group overlap or maximizing interval); (2) high repeatability of assessment (such as symmetrical width rather than asymmetrical length); (3) small relative error in measurement (selecting the physically largest continuous rigid feature for measurement).
  • These metrological principles also apply to individuation of unique objects in general.
  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