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   20093篇
  免费   544篇
各国政治   789篇
工人农民   748篇
世界政治   1552篇
外交国际关系   674篇
法律   12594篇
中国共产党   2篇
中国政治   91篇
政治理论   3981篇
综合类   206篇
  2020年   243篇
  2019年   278篇
  2018年   367篇
  2017年   428篇
  2016年   472篇
  2015年   316篇
  2014年   377篇
  2013年   1872篇
  2012年   484篇
  2011年   551篇
  2010年   413篇
  2009年   426篇
  2008年   540篇
  2007年   570篇
  2006年   533篇
  2005年   467篇
  2004年   504篇
  2003年   523篇
  2002年   477篇
  2001年   800篇
  2000年   726篇
  1999年   601篇
  1998年   302篇
  1997年   251篇
  1996年   218篇
  1995年   219篇
  1994年   259篇
  1993年   244篇
  1992年   389篇
  1991年   442篇
  1990年   402篇
  1989年   425篇
  1988年   402篇
  1987年   414篇
  1986年   404篇
  1985年   399篇
  1984年   342篇
  1983年   369篇
  1982年   273篇
  1981年   256篇
  1980年   190篇
  1979年   275篇
  1978年   193篇
  1977年   161篇
  1976年   155篇
  1975年   146篇
  1974年   172篇
  1973年   152篇
  1972年   144篇
  1971年   129篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
951.
952.
The purpose of this paper is to measure and explain variations in productive efficiency of municipal governments in Belgium. Technical efficiency is evaluated using a non-parametric method based on the Free Disposal Hull (FDH) reference technology. We first calculate input, output, and graph Farrell efficiency measures for a cross-section of all 589 Belgian municipalities. In a second stage of the analysis we explain the calculated differences in efficiency in terms of variables related to the structural characteristics of municipalities and to the institutional environment.  相似文献   
953.
954.
955.
The purpose of this study was to test hypotheses regarding (1) relations among negative affect and hormones of gonadal and adrenal origin in young adolescents, at three times of measurement, over a one-year period; and (2) stability of negative affect. The sample consisted of 10- to 14-year-old boys (N=56) and 9- to 14-year-old girls (N=52). The adolescents were assessed three times at 6-month intervals over one year. Serum levels of gonadotropins, gonadal steroids, adrenal androgens, and cortisol were assessed, as well as stage of pubertal development (Tanner criteria). The negative affect assessments consisted of self-report questionnaire and interview measures of anxiety and depressive affect, as well as mother reports of internalizing behavior problems. In the concurrent (cross-sectional) analyses, boys reporting higher levels of negative affect tended to be those at higher genital stage or older age, with lower testosterone and cortisol levels and lower dehydroepian-drosterone sulphate levels. In the longitudinal analyses, negative affect, and to a lesser extent hormone levels at the first time of measurement predicted negative affect 12 months later. The findings suggest that puberty-related hormone levels should be considered along with psychological characteristics in examining the processes involved in the development of negative affect during the pubertal years.Received Ph.D. from The Pennsylvania State University. Research interests include hormone-behavior interactions and emotional development.Received Ph.D. from The Pennsylvania State University. Research interests include neuroendocrinology and adolescent depression.Recieved M.D. from Athens University. Research interests include hypothalamic releasing factors and stress.  相似文献   
956.
Body image and weight loss beliefs and behaviors were assessed in 341 female and 221 male high school students. Estimates of body dissatisfaction varied depending on the measurement strategy used. Despite having similar weight distributions around the expected norm, girls were significantly more dissatisfied with their bodies than boys. Body Mass Index was positively related to body dissatisfaction in girls and boys, while higher exercise levels were related to higher body satisfaction in boys. Nearly two-thirds of girls and boys believed being thinner would have an impact on their lives, but the majority of girls believed this would be positive while the majority of boys believed this would be negative. Thirteen percent of female subjects reported using one or more extreme weight loss behavior at least weekly. Beliefs regarding the effectiveness of different weight loss measures were assessed. Weight loss behaviors in this Australian sample appear similar to comparable U.S. samples.Received Ph.D. from University of Tasmania. Main research interest in body image, weight loss behaviors, and eating disorders.Received Ph.D. from University of Connecticut. Main research interest in body image, eating disorders and weight loss behaviors.Dietitian degree from Melbourne University, Melbourne. Main research interest in eating practices and clinical outcome.M.D. from University of Melbourne, D.P.M. from U.K. FRC Psych. Main research interests in eating disorders.B.B.Sc.(Hons.) received from La Trobe University, Melbourne, B.A. received from University of Minnesota, Duluth. Main research interest in attitudes and attributions.B.A. Received from University of Minnesota, Duluth. Main research interest in adolescence and eating disorders.  相似文献   
957.
958.
959.
Abstract: This article focuses on competition for votes between parties, as it existed in Western Europe in the period of the direct election to the European Parliament in 1989. Following earlier research by Van der Eijk and Niemöller, an instrument is introduced to measure the probability of party choice of EC citizens which establishes the likelihood of respondents to vote for any of the nationally relevant options/parties. A number of substantive conclusions about political parties'competitive performance result from this research. First, a single mechanism seems to structure electoral competition in all EC member-countries. Second, the competitive performance of political parties is not affected by their governmental status, their ideological position, and the degree of politicisation of the electoral environment. And third, parties'competitive performance is strongly affected by the degree of uniqueness of their electoral potential, their mobilising capacities, their ideological extremity and their sheer size.  相似文献   
960.
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