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   57183篇
  免费   2354篇
  国内免费   21篇
  59558篇
  2020年   526篇
  2019年   642篇
  2018年   908篇
  2017年   942篇
  2016年   1021篇
  2015年   773篇
  2014年   871篇
  2013年   4173篇
  2012年   1637篇
  2011年   1613篇
  2010年   1005篇
  2009年   962篇
  2008年   1397篇
  2007年   1443篇
  2006年   1228篇
  2005年   1178篇
  2004年   1101篇
  2003年   1040篇
  2002年   1076篇
  2001年   1849篇
  2000年   1775篇
  1999年   1327篇
  1998年   585篇
  1996年   537篇
  1992年   1214篇
  1991年   1146篇
  1990年   1175篇
  1989年   1027篇
  1988年   1036篇
  1987年   977篇
  1986年   1030篇
  1985年   1103篇
  1984年   845篇
  1983年   773篇
  1982年   543篇
  1981年   534篇
  1979年   966篇
  1978年   662篇
  1977年   606篇
  1976年   585篇
  1975年   821篇
  1974年   961篇
  1973年   1014篇
  1972年   847篇
  1971年   802篇
  1970年   796篇
  1969年   758篇
  1968年   1013篇
  1967年   884篇
  1966年   789篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Two cognitive approaches, introduced by Schachter and Singer (1962) and by Valins (1966), have dominated the experimental study of emotion attributions. However, subsequent results using these approaches have not appeared to be very consistent, and this view is not consistent with more physiologically oriented theory. Research significant in the development of theory from these approaches was examined. Inconsistent findings using the Schachter and Singer paradigm were attributed to the difficulty of producting completely ambiguous physiological cues. The existence of active search in determining the cause of arousal was established and found central to production of Valins's false feedback effect. Postulated mediation by self-persuasion was found to provide the best fit to the existing data. The generality of these studies was described in terms of a more comprehensive theory based on the finding that the relative ambiguity of situational and physiological cues seems to provide the fundamental control over the emotion attribution process. This synthesis eliminates the deficiencies in previous hypotheses by more completely encompassing potential cue combinations.  相似文献   
992.
Learned helplessness theory predicts that animals exposed to inescapable shock acquire an expectancy of response-reinforcer independence, which proactively interferes with learning of response-reinforcer dependence. The theory also predicts that this expectancy can increase sensitivity to subsequent instances of response-reinforcer independence. These experiments test the latter prediction in a paradigm that minimizes the confounding effects of shock-induced activity deficits. Rats were trained to respond for food, then given either escapable, inescapable, or no shock. Subsequently, they received two sessions of response-contingent food followed by sessions of noncontingent food deliveries. During this phase, inescapably shocked animals decreased responding faster than did controls. Experiment 2 replicated this finding with a different schedule of food delivery and a procedure that more directly minimized the possibility that the outcome is due to either direct or indirect shock-induced activity changes. These results support the prediction that uncontrollable aversive events can increase an animal's sensitivity to noncontingent response-reinforcer relationships.  相似文献   
993.
Although the use of merit pay, incentive pay, bonus pay, and job promotion are well-established measures in the private or corporate sector of American society, few examples of successful teacher merit pay systems exist. In 1983, the Eastern Washington University Department of Education surveyed six major private corporations to determine whether corporate merit pay programs could be applied to teachers and educational institutions. Survey findings suggest several reasons why merit pay programs for teachers will probably fail: (a) lack of monetary goals; (b) the necessity for subjective evaluation, which requires multiple measurement devices, extensive supervision, and time; (c) the absence of a many-tiered corporate structure in most educational institutions; and (d) increased supervisory direction that could stifle creativity and flexibility.  相似文献   
994.
Vasopressin prolongs bradycardiac response during orientation   总被引:1,自引:0,他引:1  
Adult male rats were implanted with transcutaneous ECG electrodes and habituated to a dark chamber with elevated background noise levels. ECG was recorded prior to, immediately after, and 3 min after sudden elimination of background noise. The orienting response to the stimulus offset was accompanied by transient bradycardia. Neither AVP (1 microgram/rat) nor oxytocin (1 microgram/rat) injected subcutaneously 1 hr prior to testing altered baseline heart rate or the immediate bradycardiac response to stimulus offset. However, AVP, and to a lesser extent oxytocin, prolonged the bradycardia induced by stimulus offset. The results show that neurohypophyseal peptide hormones enhance the cardiovascular component of orienting to stimulus change.  相似文献   
995.
To compare the predictive value of "cognitive map" and "working memory" theories of hippocampal function, the performance of rats with dorsal hippocampal lesions was compared to that of control rats in a series of experiments. In Experiment I, experimental rats learned a spatial alternation task with normal ease, but in Experiment II, they were significantly impaired on an elevated 8-arm radial maze. In Experiment III, the performance of the same experimental and control rats was compared on two versions of a 16-arm enclosed radial maze. In the first version, carpet inserts served as cues to mark eight unbaited arms and each of the remaining arms contained one food pellet. While both experimental and control rats successfully avoided the set of cued arms, experimental rats reentered uncued baited arms more frequently than did control rats. In the second version no intramaze cues were provided, but the spatial distribution of baited and unbaited arms remained the same as that used in the first version. In this uncued version, experimental rats both entered unbaited arms and reentered baited arms more frequently than did control rats, i.e., they were impaired in both "reference" and "working" memory. These findings are compatible with the hypothesis that hippocampal lesions result in an impaired capacity to form cognitive maps but they are not compatible with the working memory hypothesis. Furthermore, twelve separate evaluators classed experimental rats as using fewer mapping and more orientation strategies than control rats in the 8-arm maze.  相似文献   
996.
997.
The Family Adaptability and Cohesion Evaluation Scales (FACES), a measure of family functioning, contains three scales: cohesion, adaptability, and social desirability. These were slightly modified (FACES- R) on the basis of pilot data and were administered to 42 clinic families (families seeking or receiving psychological services) and 206 nonclinic families. Support for the scales was found in high coefficient alpha reliabilities and similarity of the sample means and standard deviations to those of the standardization sample. However, there was little agreement among family members' scale scores. Therapists' ratings of cohesion and adaptability did not correlate with scale scores among clinic families. There was no difference between clinic and nonclinic samples on the cohesion or adaptability scales, although the social desirability scale did discriminate between groups. Factor analysis suggested that cohesion, adaptability, and social desirability cannot be clearly differentiated using this measure.This work was supported by the American Association of University Women and by Grant R01HD13820 from the National Institute of Child Health and Human Development.  相似文献   
998.
999.
1000.
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