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   7119篇
  免费   177篇
各国政治   424篇
工人农民   308篇
世界政治   434篇
外交国际关系   267篇
法律   4416篇
中国政治   40篇
政治理论   1358篇
综合类   49篇
  2020年   72篇
  2019年   88篇
  2018年   116篇
  2017年   139篇
  2016年   146篇
  2015年   106篇
  2014年   136篇
  2013年   760篇
  2012年   144篇
  2011年   155篇
  2010年   151篇
  2009年   144篇
  2008年   177篇
  2007年   186篇
  2006年   191篇
  2005年   150篇
  2004年   142篇
  2003年   162篇
  2002年   131篇
  2001年   274篇
  2000年   232篇
  1999年   223篇
  1998年   95篇
  1997年   78篇
  1996年   71篇
  1995年   64篇
  1994年   74篇
  1993年   67篇
  1992年   121篇
  1991年   159篇
  1990年   154篇
  1989年   142篇
  1988年   148篇
  1987年   165篇
  1986年   159篇
  1985年   148篇
  1984年   131篇
  1983年   120篇
  1982年   81篇
  1981年   91篇
  1980年   68篇
  1979年   126篇
  1978年   86篇
  1977年   72篇
  1976年   56篇
  1975年   81篇
  1974年   86篇
  1973年   82篇
  1972年   56篇
  1971年   57篇
排序方式: 共有7296条查询结果,搜索用时 15 毫秒
311.
312.
Conflicts between favorites and underdogs are everyday phenomena. We examine their strategic behavior in an experimental contest, and find behavior partially consistent with predictions. Favorites given a first-mover advantage do overcommit effort relative to Nash. Underdogs often select the best response effort level given the favorite's move. Overall dissipation of the prize was significantly higher with the strategic commitment relative to Nash. qu]Life is not so mathematically idiotic that it allows only the big to eat the small, for it happens just as often that the bee kills the lion, or at least drives it mad.  相似文献   
313.
Explored the influence of life stress as mediated or moderated by locus of control, family environment, social support, and coping style on psychological adjustment and school performance in 164 ninth graders from Baltimore. Gender differences in findings were shown. For boys, family cohesion was the only variable found to protect against the effects of stress. Family cohesion did not serve protective functions for girls, and along with overall social support, was associated with increased vulnerability to school problems. The report of problem-focused coping strategies exerted a number of protective functions for girls only. External locus of control was found to increase boys' and girls' vulnerability to the effects of life stress. Empirical development of interventions to improve the psychosocial adjustment of inner-city adolescents is discussed.Received Ph.D. from Virginia Polytechnic Institute and State University in 1991. Research interests include evaluation of school mental health services, empirical development of interventions for children, and the impact of violence on urban youth.Received B.A. from Cornell University. Interests include stress and coping in children, identification of resilience factors, and evaluation of child mental health systems of care.Received Ph.D. from the University of Oklahoma in 1967. Research interests include psychophysiology, sleep disorders, and biofeedback and instrumentation.Received B.A. from Loyola College. Interested in applied work with adolescents and adults.Received M.D. from Duke University in 1968. Research interests include training in child and adolescent psychiatry, adolescent psychopathology, and the development of school mental health programs.  相似文献   
314.
315.
316.
317.
Political influence by a professional association, like the influence of any special interest group, is a collective good for the members of the profession. This paper investigates the variables affecting the ability of state optometric associations to overcome the free rider problem and induce optometrists to join the association. Although the empirical results show little evidence that organization costs are reduced by concentration in urban areas, the results do strongly support the hypothesis that there will be less free riding in smaller groups. The results also support the hypothesis that selective incentives enable latent groups to overcome the free rider problem. By providing continuing education at reduced fees to members of the association, optometric associations have increased the percentage of optometrists who are association members in those states with statutory continuing education requirements.  相似文献   
318.
In principle, reporting by state and local governments to thefederal government is essential to the design and implementationof national policy. In practice, reporting often engenders resentmentof federal intrusion and is often dismissed as a waste of stateand local resources. Is reporting useless? Does it strengthenthe federal government at the expense of state and local governments?We asked federal, state, local, and site officials about thevalue and burden of five specific reporting systems in elementaryand secondary education. Common assumptions about reportingdid not correspond to respondent reactions. Both value and burdencascade through the intergovernmental system, reaching policymakersin all governments. Although critics seldom discriminate betweentypes of reporting, we found that reporting designed to improvecompliance with federal standards evoked different judgmentsof value and burden than reporting designed for assistance.These results suggest some new approaches to federal policygoverning the collection of information and to the design ofindividual reporting systems.  相似文献   
319.
320.
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