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   23267篇
  免费   790篇
  国内免费   11篇
  2020年   222篇
  2019年   218篇
  2018年   335篇
  2017年   399篇
  2016年   386篇
  2015年   241篇
  2014年   321篇
  2013年   1742篇
  2012年   648篇
  2011年   695篇
  2010年   441篇
  2009年   408篇
  2008年   585篇
  2007年   588篇
  2006年   532篇
  2005年   493篇
  2004年   456篇
  2003年   427篇
  2002年   496篇
  2001年   737篇
  2000年   747篇
  1999年   560篇
  1998年   265篇
  1997年   218篇
  1992年   457篇
  1991年   416篇
  1990年   449篇
  1989年   422篇
  1988年   404篇
  1987年   413篇
  1986年   418篇
  1985年   431篇
  1984年   349篇
  1983年   304篇
  1982年   241篇
  1981年   219篇
  1979年   394篇
  1978年   284篇
  1977年   269篇
  1976年   232篇
  1975年   350篇
  1974年   387篇
  1973年   357篇
  1972年   338篇
  1971年   292篇
  1970年   261篇
  1969年   326篇
  1968年   362篇
  1967年   329篇
  1966年   334篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Previous research has revealed that individuals have expectations for the development of romance based on personal experience and cultural images. A series of research questions and hypotheses was generated and a sequence of hierarchical log-linear analysis models axis developed to test (a) the effect of gender and knowledge of relational stage and relationship type on prediction of next-occurring actions in the development of a romance, (b) the use of compliance-gaining strategies intended to advance a relationship to the next stage, and (c) justification of secondary goals in which participants reported why they chose the strategies they did as opposed to other alternatives. The data revealed effects for relational stage progression on prediction of ensuing actions. Ingratiation, explanation, and direct requests were popular strategies for developing intimacy. Gender differences in terms of secondary goals were reported. Results are discussed in terms of relational memory structures for the development of intimacy.  相似文献   
52.
53.
54.
Three experiments used a discriminated operant procedure to study conditional discrimination learning in rats. The first experiment showed that rats were capable of learning a biconditional discrimination in which two contexts served as conditional cues signalling the reinforcement contingencies associated with two discriminative stimuli. The discrimination was learned equally well when one discriminative stimulus signalled food, the other its absence, and when one stimulus signalled food, the other extinction plus mild footshock.

In Experiment 2 it was shown that prior training on such a conditional discrimination enhanced the subsequent context specificity of simple conditioning relative to control groups of animals for whom the prior training had not been conditional. Experiment 3 showed that a reversal of the significance of one pair of discriminative stimuli produced no spontaneous reversal in performance to a second, target, pair.

The pattern of results is best accounted for by an analysis of contextual conditional discrimination learning in terms of stimulus configurations and offers no support for the notion that rats may learn a general conditional rule or set.  相似文献   
55.
We examined the effects of acute psychological stress on lymphocyte proliferation and circulating levels of interleukin-1 and -2. Healthy men were exposed to two viewings of a gruesome surgery film and were asked to recall details of the film twice during a 30-min period. These subjects were compared to a nonstress control group. Lymphocyte proliferation to the mitogen concanavalin A (Con A; 5 micrograms/ml) was decreased during and after exposure to the stressor when compared to the control group. This decrease was more pronounced in subjects exhibiting greater blood pressure reactivity while viewing the film than in subjects showing smaller blood pressure responses. None of the other immunological measures was significantly affected by the stressor. Cortisol was not correlated with lymphocyte responsiveness. Possible explanations for these results and implications for further research are discussed.  相似文献   
56.
57.
58.
59.
60.
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