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   28343篇
  免费   201篇
  国内免费   13篇
教育   20049篇
科学研究   2934篇
各国文化   203篇
体育   2090篇
综合类   28篇
文化理论   248篇
信息传播   3005篇
  2021年   263篇
  2020年   408篇
  2019年   558篇
  2018年   764篇
  2017年   804篇
  2016年   742篇
  2015年   489篇
  2014年   665篇
  2013年   4937篇
  2012年   642篇
  2011年   695篇
  2010年   541篇
  2009年   479篇
  2008年   612篇
  2007年   527篇
  2006年   576篇
  2005年   428篇
  2004年   457篇
  2003年   409篇
  2002年   457篇
  2001年   604篇
  2000年   598篇
  1999年   510篇
  1998年   268篇
  1997年   333篇
  1996年   350篇
  1995年   291篇
  1994年   261篇
  1993年   276篇
  1992年   417篇
  1991年   393篇
  1990年   424篇
  1989年   443篇
  1988年   418篇
  1987年   387篇
  1986年   375篇
  1985年   424篇
  1984年   346篇
  1983年   365篇
  1982年   303篇
  1981年   272篇
  1980年   273篇
  1979年   403篇
  1978年   317篇
  1977年   275篇
  1976年   244篇
  1975年   222篇
  1974年   223篇
  1973年   208篇
  1971年   195篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
171.
    
Nuclear fusion potentially offers a clean,environmentally friendly and intrinsically safe energy source with an abundant fuel supply.Magnetic fusion energy rese...  相似文献   
172.
173.
174.
    
The main purpose of the present research was to check the possibility of measuring the feeling of “intuitive acceptance”, experienced by a subject when he offers an intuitive solution to a problem. It was postulated that two dimensions have to be considered and combined: The level of confidence and the degree of obviousness. Almost all the questions asked referred to the notion of infinity. The subjects were pupils belonging to grades 8 and 9. Three main categories of problematic situations have been identified:
  1. Problems which got high percentages of correct solutions and high levels of intuitive acceptance.
  2. Problems which got two types of contradictory solutions, each of them being accepted with moderate intuitiveness.
  3. Problems which got low frequencies of correct solutions and high frequencies of typical incorrect solutions, the second category presenting higher levels of intuitive acceptance than the first (counter-intuitive problematic situations).
  相似文献   
175.
176.
  总被引:2,自引:0,他引:2  
Researchers often ask subjects to commit considerable time and effort to completing tasks that are not especially enjoyable. In a multistage investigation of sixth-grade boys and their families, we hypothesized that boys who were prone to high levels of distress (i.e., anxiety, depression, low self-esteem, and low well-being) but only low or moderate levels of self-restraint (i.e., consideration of others, impulse control, suppression of aggression, and responsibility) would be particularly unlikely to agree to participate. Consistent with this hypothesis, boys from 33 classrooms who were nominated by their peers as high in distress and moderate or low in self-restraint were significantly less likely than other boys to take part in an in-class survey. In addition, the families of boys who scored high in distress and moderate or low in self-restraint on the Weinberger Adjustment Inventory (WAI) were less likely than other families to agree to an observation session in their homes and to a series of telephone interviews about daily events in the boys' lives. Across the 3 phases of the research, the cumulative attrition rate of these at-risk boys was approximately 80%, compared to only 50% for those low in distress and/or high in self-restraint. These results suggest that the children of greatest interest in studies of social competence and family interaction may often be among those least adequately represented.  相似文献   
177.
178.
The present study examines the effects of early emotional experiences on children's regulation or strategic control of attention in the presence of interpersonal hostility. Abused children's reactions to the unfolding of a realistic interpersonal emotional situation were measured through multiple methods including autonomic nervous system changes and overt behavioral performance. Although physically abused and non-physically abused 4-year-old children did not differ in terms of their baseline levels of arousal, marked differences in physically abused children's regulatory responses to background anger emerged. These data suggest that the emergence of anger leads to increases in anticipatory monitoring of the environment among children with histories of abuse. Results are discussed in terms of risk factors in the development of psychopathology.  相似文献   
179.
This is a study of the costs of instruction in a large public research university. It departs from other work on instructional costs in its attempt to draw inferences about the economic costs of incremental or marginal enrollments. Focusing on graduate education, we examine how the costs directly facing faculty differ from those incurred by the institution's administration and legislature as reflected in the budgetary rewards for instruction. These cost differences provide the wherewithal for a university to carry out basic research and other important functions that lack a paying clientele. The study also explores the roles of economic costs in the institution's pricing of graduate education.  相似文献   
180.
Dutch boys 8 and 12 years old read brief stories about a harm doer whose intentions were either good or bad and whose actions resulted in either minor or serious injury to a victim. The harm doer had previously been either strongly provoked or not provoked by the victim. The older boys differentiated their evaluations of the harm doer's naughtiness on the basis of provocation and intentions, while the younger boys failed to differentiate their evaluations of the provoked harm doer on the basis of intentions. Both age groups strongly differentiated their judgments of the victim's naughtiness on the basis of his role as provoker, except when the victim was seriously injured by a bad-intentioned aggressor.  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