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   91529篇
  免费   2011篇
  国内免费   3篇
管理学   12482篇
民族学   554篇
人才学   26篇
人口学   6891篇
丛书文集   527篇
教育普及   1篇
理论方法论   9657篇
综合类   2131篇
社会学   42247篇
统计学   19027篇
  2023年   520篇
  2021年   583篇
  2020年   1543篇
  2019年   2276篇
  2018年   2133篇
  2017年   3199篇
  2016年   2463篇
  2015年   2113篇
  2014年   2693篇
  2013年   19096篇
  2012年   2374篇
  2011年   2159篇
  2010年   2005篇
  2009年   2238篇
  2008年   2063篇
  2007年   1866篇
  2006年   2094篇
  2005年   2291篇
  2004年   2172篇
  2003年   1908篇
  2002年   1997篇
  2001年   1985篇
  2000年   1761篇
  1999年   1670篇
  1998年   1506篇
  1997年   1362篇
  1996年   1309篇
  1995年   1326篇
  1994年   1280篇
  1993年   1289篇
  1992年   1251篇
  1991年   1194篇
  1990年   1166篇
  1989年   997篇
  1988年   1084篇
  1987年   965篇
  1986年   860篇
  1985年   1048篇
  1984年   1110篇
  1983年   992篇
  1982年   917篇
  1981年   853篇
  1980年   801篇
  1979年   859篇
  1978年   766篇
  1977年   689篇
  1976年   651篇
  1975年   618篇
  1974年   517篇
  1973年   430篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Conflict over water resources is a major problem throughout the world. This essay describes the long-standing and often successful effort to insulate decisions on how to allot water among contending users, and how to reduce water pollution along a 5000-mile international border. The effort has been fraught with political and scientific complexity. Yet, after more than 90 years of experience, it provides a model that other nations are beginning to examine as relevant to their own efforts to find solutions.  相似文献   
22.
The historical relationship between the electoral college and controversial U.S. presidential elections, specifically with respect to conflict, is examined. The elections of 1800, 1824, 1860, 1876, 1888, 1968, and 2000 are examined. Aside from the 2000 election, there has been essentially no conflict in American history due to the electoral college. The constitutional structure and thinking behind the form of the electoral college is given, with emphasis on the federal aspects of the structure. The current movement to abolish the electoral college in favor of direct popular vote is depicted, along with the arguments against making that change. The conclusion is that we as a nation are far better off to retain the status quo than to make the called-for change.  相似文献   
23.
A study sample of 162 six‐month‐old children was selected from a larger sample of 346 infants on the basis of parents' report of their infants' temperament and a laboratory assessment of temperament. Infants were classified as easily frustrated and less easily frustrated and compared on a number of emotion regulation, physiology, and temperament measures. Results indicated that male and female infants were equally likely to be classified as frustrated and less easily frustrated; however, male infants were less able to regulate physiologically. Easily frustrated infants used different emotion regulation strategies and were observed to be less attentive and more active than less easily frustrated infants when observed in the laboratory. These infants were also characterized by their parents as more active, less attentive, and more distressed to novelty. Infants classified as easily frustrated were more reactive physiologically and less able to regulate physiological reactivity than their less easily frustrated counterparts. It is hypothesized that this cluster of characteristics may constitute a unique temperamental type that may have implications for other types of behavioral functioning. Limitations of the study are that observations are based on a single brief assessment of the infant, modest effect sizes were found, and the study is cross‐sectional.  相似文献   
24.
The product of two independent or dependent scalar normal variables, sums of products, sample covariances, and general bilinear forms are considered. Their distributions are shown to belong to a class called generalized Laplacian. A growth-decay mechanism is also shown to produce such a generalized Laplacian. Sets of necessary and sufficient conditions are derived for bilinear forms to belong to this class. As a generalization, the distributions of rectangular matrices associated with multivariate normal random vectors are also discussed.  相似文献   
25.
26.
27.
28.
29.
30.
The authors examined the impact of sense of coherence on the career thought processes of a sample of college students. A. Antonovsky (1987) defined sense of coherence as the global orientation that the world is comprehensible, manageable, and meaningful. Study participants completed the Sense of Coherence Scale (A. Antonovsky, 1987) and the Career Thoughts Inventory (CTI; J. P. Sampson, G. W. Peterson, J. G. Lenz, R. C. Reardon, & D. E. Saunders, 1996). Multivariate tests indicated a medium relationship between sense of coherence and CTI Total and subscale scores; sense of coherence accounted for 14% of the variance. Univariate tests also indicated a medium relationship between sense of coherence and each subscale.  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