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   35156篇
  免费   1404篇
  国内免费   10篇
  36570篇
  2019年   473篇
  2018年   624篇
  2017年   639篇
  2016年   642篇
  2015年   460篇
  2014年   579篇
  2013年   2694篇
  2012年   1060篇
  2011年   1120篇
  2010年   675篇
  2009年   663篇
  2008年   965篇
  2007年   960篇
  2006年   909篇
  2005年   831篇
  2004年   822篇
  2003年   730篇
  2002年   766篇
  2001年   1053篇
  2000年   965篇
  1999年   754篇
  1998年   427篇
  1997年   339篇
  1996年   353篇
  1992年   592篇
  1991年   571篇
  1990年   562篇
  1989年   576篇
  1988年   561篇
  1987年   529篇
  1986年   551篇
  1985年   615篇
  1984年   476篇
  1983年   469篇
  1982年   389篇
  1981年   365篇
  1979年   538篇
  1978年   402篇
  1977年   331篇
  1976年   375篇
  1975年   447篇
  1974年   507篇
  1973年   522篇
  1972年   418篇
  1971年   391篇
  1970年   386篇
  1969年   412篇
  1968年   493篇
  1967年   427篇
  1966年   424篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
In two experiments, water-deprived rats were exposed to tone-footshock pairings in a particular conditioning context. In Experiment 1, the training parameters were selected on the basis of parametric pilot data so as not to produce direct associations between the conditioning context and footshock. Despite independent evidence of no appreciable direct association between the conditioning context and footshock, animals tested in the conditioning context exhibited more lick suppression to the tone than other animals tested with the tone outside of the conditioning context. Thus, the conditioning context potentiated suppression to the tone in the absence of appreciable fear of the conditioning context. In Experiment 2, training parameters were used that permitted the formation of direct associations between the conditioning context and footshock; however, for half the animals, these associations to the context were then extinguished. With the tone absent, a comparison of extinguished animals tested either in the conditioning context or outside the conditioning context detected no differences in suppression, demonstrating the effectiveness of the extinction manipulation. However, other animals also subjected to extinction of direct context-footshock associations displayed greater suppression to the tone within the conditioning context than comparable animals tested outside the context. Collectively the data indicate that the superior retention-test performance seen within the training context can arise both from the commonly assumed direct associations between the training context and the unconditioned stimulus and from the potentiation by the training context of the associations between the nominal conditioned stimulus and unconditioned stimulus.  相似文献   
992.
Delay or rate of food delivery as determiners of response rate   总被引:16,自引:16,他引:0       下载免费PDF全文
Pigeons were confronted with two keys: a green food key and a white changeover key. Food became available for a peck to the green key after variable intervals of time (mean = 113 seconds). A single peck on the changeover key changed the color of the food key to red for a fixed period of time during which the timing of the variable-interval schedule in green was suspended and the switching option eliminated and after which the conditions associated with green were reinstated. In Experiment 1 a single food presentation was obtainable during each red-key period after a minimum delay timed from the switch. This delay and the duration of the red-key period were held constant during a condition but varied between conditions (delay = 2.5, 7.5, 15, or 30 seconds; red-period duration = 30, 60, 120, 240, or 480 seconds). In Experiment 2 additional food presentations were scheduled during a 240-second red-key period with the delay to the first food delivery held constant at 30 seconds, and the delays to later food deliveries varied over conditions. Considering the data from both experiments, the rate of switching to red was a decreasing function of the delay to the first food, the delay to the second food, and perhaps the delay to the third food after a switch. There was no clear evidence that the rate of food in the red-key period made an independent contribution. The ordering of response rates among conditions was consistent with the view that each food presentation after a response adds an incremental effect to the rate of the response and that each food presentation's contribution is a decreasing function of its delay timed from the response.  相似文献   
993.
Separate factor analyses of responses to the Tennessee Self-concept Scale using item and scale data are reported for a sample of 255 disabled veterans. A global self-satisfaction factor and several subsidiary factors roughly approximate the external dimension of the scale. The internal dimension interacts with the external one in defining several factors but does not emerge as an independent dimension. Scale data yield a self-esteem factor incorporating both external and internal scales and a self-concept conflict-integration factor. The evidence supports the external dimension more than the internal dimension. The findings are consistent with previous studies that have not validated the two-dimensional design of the scale.  相似文献   
994.
Two experimental studies were run to test the effects of subordinate impression management on the appraisals and responses of a manager, following an incident of poor performance. Two common impression management tactics, accounts and apologies, were manipulated in each of the studies. Subjects in both studies were experienced nursing supervisors. On the basis of the "discounting effect" reported in the attributional literature it was hypothesized that accounts of external causes for poor performance, i.e., excuses, would lead subjects to (1) attribute less responsibility to the subordinate, (2) be less personal in their responses, and (3) be less punitive in their responses. Apologies, because of their "equity restoration" effects, were expected to influence subjects' disciplinary responses to the poor performance, without necessarily affecting their attributions of responsibility. Experiment 1. which employed written stimulus materials and a repeated-measures design, provided strong support for all hypotheses. Experiment 2. which employed a film stimulus and between-subjects design, provided strong support for the accounts hypotheses but only minimal support for the apology hypotheses. The results highlight the importance of social information cues in the appraisal of performance.  相似文献   
995.
The definitional responses on standardized tests of 49 children, ages 3–15, give evidence of a transitional stage in defining which is called hypothetical. Definitions of this stage are indicated by hypothetical markers. Five hypothetical markers are described briefly and one,like, in greater detail. The relationship oflike to taxonomic conceptual structure and to synonymy is stressed. The roles oflike in language development, logical inference, and communication are discussed.  相似文献   
996.
Directional judgments are typically slower when relative location is described by the words “east” and “west” or “right” and “left” than when described by the words “north” and “south” or “up” and “down.” A series of experiments are reported that disentangle verbal from perceptual encoding explanations for right-left difficulty. Overall, our results support a verbal encoding explanation for right-left confusion in the adult. Experiments 1-3 demonstrate that in a response-differentiation task, it is response to the labels “north,” “east,” “south,” and “west” that is responsible for right-left confusion. In addition, Experiments 4-6 demonstrate that right-left difficulty in a mirror image discrimination task is contingent on the use of directional labels. (The data also suggest that it may be more difficult to deal with “up,” “down,” “left,” and “right” than with “north,” “south,” “east,” and “west”) The data are interpreted as inconsistent with a bilateral symmetry explanation for right-left confusion.  相似文献   
997.
It is argued that researchers and therapists could benefit from a detailed comparison of marital observation coding systems. The five chosen for comparison are Weiss' Marital Interaction Coding System, Gottman's Couples Interaction Scoring System, Filsinger's Dyadic Interaction Scoring Code, Olson and Ryder's Marital and Family Interaction Coding System, and Raush's Coding Scheme for Interpersonal Conflict. The strengths and weaknesses of each are noted, along with recommendations for their use in clinical situations.  相似文献   
998.
C E Sluzki 《Family process》1983,22(4):469-476
Therapeutic modalities centered in interpersonal processes, in structural phenomena, and in reality constructions--the three care orientations in the field of family therapy--are here defined as mutually nonexclusive "translations" of the systemic paradigm into clinical practice. This definition does not attempt to blur the distinctions among these models but seeks to show their common denominator and thus expands the conceptual and clinical repertoire of the systems-oriented family therapist.  相似文献   
999.
The science of family systems has begun to develop concepts and methods for objectively assessing important characteristics of families. Thus we now have ways of measuring differences among families with respect to cohesiveness, flexibility, clarity of communication, and shared views of social reality. We know practically nothing, however, about the origins of these differences among families. One possibility is that the skills or personal attributes of one or more individual members influences the characteristics of the family as a whole. This paper explores the hypothesis that the perceptual styles of individual members--the ways they organize their experience of their personal stimulus world--influence the shared perceptions the family develops of the social world in which it lives. We explored relationships between nine measures of perceptual style and problem-solving measures of the family's shared perception of its social world. The findings showed many similarities among members of the same family on several measures of perceptual style. However, perceptual style had only a few relationships with family performance in the problem-solving task.  相似文献   
1000.
A psycholinguistically based conception of the relation among context, categorization, and memory is tested by examining what happens to people's memory of an object when the object is initially categorized in terms of the context in which it appears, but, when the object is later recalled, this context is no longer salient. Subjects read about the sentencing decisions of a target trial judge in the context of other trial judges who consistently gave either higher sentences or lower sentences than the target judge. As predicted, subjects tended to categorize the target judge as “lenient” in the former, harsh context condition, and as “harsh” in the latter, lenient context condition. A week later, subjects read about the sentencing decisions of some additional judges, and then recalled the sentencing decisions of the target judge they had read about the week before. Across the two sessions, either a harsh, moderate, or lenient category norm for judges' sentencing decisions was established by having subjects read about decisions that involved either high, medium, or low sentences, respectively. The results indicated that subjects recalled the target judge's decisions by interpreting their prior categorization of his behavior in terms of the category norm established across the two sessions rather than the original context. Thus, subjects who were exposed to the same target in the same circumstances, and initially categorized the target in the same way, nevertheless remembered his behavior differently if their category norm was different at the moment of recall. Other types of “change of standard” and their implications for human judgment and memory are discussed.  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