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   1736篇
  免费   41篇
  国内免费   2篇
  1779篇
  2020年   13篇
  2019年   21篇
  2018年   27篇
  2017年   22篇
  2016年   33篇
  2015年   19篇
  2014年   22篇
  2013年   162篇
  2012年   65篇
  2011年   63篇
  2010年   39篇
  2009年   26篇
  2008年   41篇
  2007年   64篇
  2006年   51篇
  2005年   51篇
  2004年   68篇
  2003年   53篇
  2002年   73篇
  2001年   42篇
  2000年   51篇
  1999年   30篇
  1998年   58篇
  1997年   37篇
  1996年   19篇
  1995年   28篇
  1994年   25篇
  1993年   26篇
  1992年   40篇
  1991年   32篇
  1990年   20篇
  1989年   24篇
  1988年   23篇
  1987年   20篇
  1986年   25篇
  1985年   26篇
  1984年   19篇
  1983年   16篇
  1982年   31篇
  1981年   27篇
  1980年   25篇
  1979年   16篇
  1978年   22篇
  1977年   14篇
  1976年   13篇
  1975年   19篇
  1974年   27篇
  1972年   13篇
  1969年   13篇
  1968年   11篇
排序方式: 共有1779条查询结果,搜索用时 18 毫秒
811.
To date little attention has been paid to forensic mental health assessments in immigration cases. This article briefly reviews the law relevant to assessments in these cases, and then examines some of the individual, family, community and cultural issues that impact upon forensic evaluations in immigration cases.  相似文献   
812.
Both metric and nonmetric multidimensional scaling methods were used to analyze similarity estimates when random polygons were used as stimulus patterns. Three dimensions, dispersion, jaggedness, and elongation were obtained with both analyses and were related to physical measures of the patterns.  相似文献   
813.
Thirty six simple patterns were judged as “random” or “patterned” by adult Ss. Category judgments were consistent whether Ss were told that 1/4, 1/2, or 3/4 of the patterns were random or if no proportion was specified. In a second experiment, Ss viewed a series of slides previously judged patterned followed by a recognition series with two additional patterned slides inserted in a series of otherwise random slides. Although slides were never labeled random or patterned, Ss made the most false recognitions for the two patterned slides. In another condition where random and patterned slides were reversed, most false recognitions were made for the two random slides. Both Gamer’s notion of hypothetical set size and an analysis of balanced elements fit the results, but the adequacy of both hypotheses can be questioned when applied to previous results with more complex patterns.  相似文献   
814.
The effects of an existing token reinforcement program upon the acquisition and maintenance of independent living skills of 12 disabled adults in two halfway houses were investigated. Tokens (points) were used to purchase advancement up a step/level system, pay daily “rent,” and purchase curfew extensions. Tokens were effective in maintaining independent living skill behaviors. However, hearing clients showed a decrease in independent living skill behaviors over the course of the program, while hearing impaired clients showed no change. This paradoxical finding appeared to be the result of inadvertant program contingencies that allowed a decrease in desired behaviors as subjects advanced to higher steps. The authors discuss how the program would be modified to increase behaviors associated with independent living skills.  相似文献   
815.
Examined the roles of gender, instrumentality, and expressivity as moderator of the relations between stressful events and psychological symptoms in samples of junior high (n = 93), senior high (n = 140), and college students (n = 145). Female adolescents in all three samples reported more overall negative events than did males. Females in the junior and senior high samples reported more negative interpersonal stresses than did males. However, there were no indications in any of the samples of a stronger relation between negative events and psychological symptoms for adolescent females than males. Further, there was little evidence that instrumentality or expressivity moderated the relations between negative events and psychological symptoms. In each sample, certain stresses were most strongly related to psychological symptoms: family stresses in the junior high, peer stresses in the senior high, and academic stresses in the college sample. Implications of the findings for developmental changes in stress during adolescence are discussed.  相似文献   
816.
Cluster analysis in community research: Epistemology and practice   总被引:2,自引:0,他引:2  
Cluster analysis refers to a family of methods for identifying cases with distinctive characteristics in heterogeneous samples and combining them into homogeneous groups. This approach provides a great deal of information about the types of cases and the distributions of variables in a sample. This paper considers cluster analysis as a quantitative complement to the traditional linear statistics that often characterize community psychology research. Cluster analysis emphasizes diversity rather than central tendency. This makes it a valuable tool for a wide range of familiar problems in community research. A number of these applications are considered here, including the assessment of change over time, network composition, network density, person-setting relationships, and community diversity. A User's Guide section is included, which outlines the major decisions involved in a basic cluster analyses. Despite difficulties associated with the identification of optimal cluster solutions, carefully planned, theoretically informed application of cluster analysis has much to offer community researchers. Editor's note: Dr. Edward Seidman served as action editor for this article while serving as Associate Editor for Methodology.  相似文献   
817.
In this study the authors explored the relationship between counselor trainee anger-proneness and anger discomfort and trainees' reactions to an angry client. A total of 38 of trainees viewed and gave their reactions to a videotape of an angry client-actress. There were two dependent variables in the study: discomfort with and anger toward the client. Trainee anger-proneness and anger discomfort scores were positively and significantly related to discomfort with and anger toward the client. Implications for future research and training are discussed.  相似文献   
818.
Monkeys performed a visual search task for food reward. Green square targets were embedded in 3 × 3 arrays of colored forms. In distinct-feature arrays, all nontarget stimuli were red diamonds, whereas in shared-feature arrays, some nontarget stimuli shared either form (red square) or color (green diamond) with the target. Reaction time was slower for shared-feature arrays and linearly related to the number of shared-feature distractors. Errors were more common in shared-feature arrays, and shared-feature distractors were mistaken for targets more frequently than distinct-feature distractors. Event-related local field potentials were recorded from implanted transcortical electrodes. Significant task-related differences were obtained from association cortex, but not from projection cortex. Results are discussed in terms of the relative contribution of inferotem-poral,  相似文献   
819.
Mark and Todd (1983) reported an experiment in which the cardioidal strain transformation was extended to three dimensions and applied to a three-dimensional (3-D) representation of the head of a 15-year-old girl in a direction that made the transformed head appear younger to the vast majority of their subjects. The experiments reported here extend this research in order to examine whether subjects are indeed detecting cardioidal strain in three dimensions, rather than detecting changes in head slant or making 2-D comparisons of the shape of the occluding contour. Three-dimensional surfaces were obtained by measuring a real head manually (Experiment 1) and with a laser scanner (Experiment 2), and transformed to different age levels using the 3-D strain transformation described by Mark and Todd (1983). There were no statistically significant differences in the accuracy with which relative age judgments could be made in response to pairs of profiles, pairs of 3/4 views, or pairs of mixed views (profile plus 3/4 view), suggesting that subjects can indeed extract the cardioidal strain level of the head in three dimensions. However, an additional effect that emerged in these studies was that judgments were crucially affected by the instructions given to subjects, which suggests that factors other than cardioidal strain are important in making judgments about rich data structures.  相似文献   
820.
Summary In the awake, behaving cat, we have compared response of striate cortex neurons to informative and to noninformative stimuli. A cat pressed a pedal in response to a flashed pattern repeated every 10 s, receiving a reward if the press was within a 0.5–1.5-s post-stimulus window. There were three trial types: 50% of the trials had only the initial informative flash, 25% had an additional physically identical, but unrewarded, flash 500 ms after the first, and 25% had an unrewarded flash 3–5 s after the informative flash. Cats learned to respond only to the rewarded flashes. Neurons were divided into two categories: 27 neurons defined as primary showed an early burst of firing 30–70 ms after stimulus onset, and 17 did not. The distinction was arbitrary, since all cells were exposed to the same stimulus. For stimuli preceding a pedal press, stimulus-synchronized histograms of primary neurons had a smaller early burst and more firing before and after it. Response-synchronized histograms showed an abrupt decrease in firing shortly before the pedal press. The effects were stronger for primary cells in the stimulus-synchronized data and stronger for non-primary cells in the response-synchronized data.  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