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   1929篇
  免费   61篇
各国政治   156篇
工人农民   61篇
世界政治   94篇
外交国际关系   68篇
法律   1308篇
中国政治   14篇
政治理论   274篇
综合类   15篇
  2021年   12篇
  2020年   37篇
  2019年   38篇
  2018年   50篇
  2017年   69篇
  2016年   62篇
  2015年   32篇
  2014年   44篇
  2013年   224篇
  2012年   45篇
  2011年   66篇
  2010年   47篇
  2009年   47篇
  2008年   54篇
  2007年   60篇
  2006年   51篇
  2005年   66篇
  2004年   54篇
  2003年   60篇
  2002年   45篇
  2001年   65篇
  2000年   50篇
  1999年   48篇
  1998年   17篇
  1997年   15篇
  1996年   21篇
  1995年   13篇
  1994年   14篇
  1993年   13篇
  1992年   30篇
  1991年   35篇
  1990年   38篇
  1989年   38篇
  1988年   35篇
  1987年   25篇
  1986年   35篇
  1985年   26篇
  1984年   21篇
  1983年   16篇
  1982年   15篇
  1981年   18篇
  1980年   12篇
  1979年   19篇
  1978年   21篇
  1977年   16篇
  1971年   21篇
  1970年   19篇
  1969年   11篇
  1968年   17篇
  1967年   12篇
排序方式: 共有1990条查询结果,搜索用时 31 毫秒
961.
In proportional representation systems, an important issue is whether a given apportionment method favors larger parties at the expense of smaller parties. For an arbitrary number of parties, ordered from largest to smallest by their vote counts, we calculate (apparently for the first time) the expected differences between the seat allocation and the ideal share of seats, separately for each party, as a function of district magnitude, with a particular emphasis on three traditional apportionment methods. These are (i) the quota method with residual fit by greatest remainders, associated with the names of Hamilton and Hare, (ii) the divisor method with standard rounding (Webster, Sainte-Laguë), and (iii) the divisor method with rounding down (Jefferson, Hondt). For the first two methods the seat bias of each party turns out to be practically zero, whence on average no party is advantaged or disadvantaged. On the contrary, the third method exhibits noticeable seat biases in favor of larger parties. The theoretical findings are confirmed via empirical data from the German State of Bavaria, the Swiss Canton Solothurn, and the US House of Representatives.  相似文献   
962.
963.
The universality of human nature determines the universality of values and its particularity determines the diversity and plurality of values that is the fundamental determinant of security problems among different value systems. In a narrow sense, value security refers to a situation in which value concepts of a state, region, or a nation, social class are not under threat from the external adversaries, which is called conceptual value security. In a broad sense, value security refers to the consistency between the system of realistic value security and that of conceptual value security. National value security encompasses both value security in a nation-state and security of national values, in which the former is featured by the recognition and acceptance of a prevailing value in a nation-state, and the latter is characterized by the sovereignty of national values. Due to the fact that the issue of value system is a meta-theoretical one and the security of conceptual value system is part of cultural security, value security holds a core position in cultural security and is an important component of overall national security system. Additionally, value security embodies the security of value pursuits and value criteria in different spheres of the overall national security system and therefore, it is also an indispensable and flexible support to the overall national security.  相似文献   
964.
This study tests a model of physical aggression in a sample of 194 men being treated for physical or psychological aggression in the greater Madrid area of Spain. The prevalence of aggression in this sample was lower than in a US batterer sample. In the path model highlighted here, borderline personality traits and alcohol problems were identified as risk factors for physical aggression perpetration and the role of borderline traits was mediated by psychological aggression. A reciprocal relationship was found between psychological perpetration and victimization but not physical perpetration and victimization. These findings are discussed within a cross-cultural context; conceptual and treatment implications are also addressed.  相似文献   
965.
We have studied the degradation of sebaceous fingerprints on brass surfaces using silver electroless deposition (SED) as a visualization technique. We have stored fingerprints on brass squares either (i) in a locked dark cupboard or (ii) in glass‐filtered natural daylight for periods of 3 h, 24 h, 1 week, 3 weeks, and 6 weeks. We find that fingerprints on brass surfaces degrade much more rapidly when kept in the light than they do under dark conditions with a much higher proportion of high‐quality prints found after 3 or 6 weeks of aging when stored in the dark. This process is more marked than for similar fingerprints on black PVC surfaces. Identifiable prints can be achieved on brass surfaces using both SED and cyanoacrylate fuming (CFM). SED is quick and straightforward to perform. CFM is more time‐consuming but is versatile and can be applied to a wider range of metal surfaces than SED, for example brass surfaces which have been coated by a lacquer.  相似文献   
966.
967.
Bullying perpetration at school is a long-term predictor of aggression, delinquency, and violence. Most research concentrates on risk factors for such developments, whereas protective factors have been rarely addressed. Therefore, the present study investigates potentially protective effects of family and child characteristics in a prospective longitudinal design. The sample contained 519 youngsters (253 boys and 266 girls) from the Erlangen-Nuremberg Development and Prevention Study. Bullying perpetration was measured at age 9.0 years, mothers’ and children's reports on family and individual characteristics were collected at age 10.6, and outcomes in self-reported aggressive/violent offending and mother-reported aggressive and delinquent behavior were collected at age 13.7. Hierarchical regression analyses revealed main effects and interactions. The latter suggest buffering protective effects of consistent discipline in parenting and children's intelligence, positive attitude to school, prosocial behavior skills, low hyperactivity/inattention, and an anxious/depressive mood. The findings varied across the two outcome measures and with regard to gender. Implications for further research and prevention practice are discussed.  相似文献   
968.
969.
970.
ABSTRACT

As is true for most legislation, the Fair Housing Act (FHA) was a product of its time; the legislation’s content, and even passage, was formed by dominant issues in housing markets and the country at that time. The context shaped the goals of the FHA and the strategies and tools employed under its auspices. Fifty years after the passage of the FHA, much of that context has changed. This commentary argues that changes in the context not only raise new fair housing challenges and create new gaps in our knowledge, but also may necessitate a fresh look at fair housing strategies and tools if they are to be effective at achieving the goals of the act. This commentary begins with a brief background on the FHA itself, the social context at the time of its writing, and its main goals. Next it lays out a few key changes in housing markets relevant for fair housing, highlighting challenges they may create and where research could be of greatest value. It then considers challenges arising from threats to two specific U.S. Department of Housing and Urban Development (HUD) fair housing rules seen by many as critical fair housing tools. The commentary ends with two examples of a “refresh,” where current context has shaped, or reshaped, a strategy to address today’s fair housing challenges.  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