全文获取类型
收费全文 | 1051篇 |
免费 | 36篇 |
国内免费 | 1篇 |
专业分类
1088篇 |
出版年
2020年 | 15篇 |
2019年 | 11篇 |
2018年 | 15篇 |
2017年 | 12篇 |
2016年 | 17篇 |
2015年 | 13篇 |
2013年 | 106篇 |
2012年 | 24篇 |
2011年 | 36篇 |
2010年 | 22篇 |
2009年 | 20篇 |
2008年 | 35篇 |
2007年 | 33篇 |
2006年 | 38篇 |
2005年 | 30篇 |
2004年 | 32篇 |
2003年 | 27篇 |
2002年 | 49篇 |
2001年 | 26篇 |
2000年 | 19篇 |
1999年 | 11篇 |
1997年 | 16篇 |
1996年 | 13篇 |
1995年 | 15篇 |
1994年 | 10篇 |
1993年 | 14篇 |
1992年 | 13篇 |
1991年 | 13篇 |
1990年 | 10篇 |
1989年 | 18篇 |
1987年 | 9篇 |
1986年 | 13篇 |
1985年 | 17篇 |
1982年 | 13篇 |
1981年 | 11篇 |
1980年 | 12篇 |
1979年 | 11篇 |
1978年 | 18篇 |
1977年 | 16篇 |
1976年 | 19篇 |
1975年 | 18篇 |
1974年 | 12篇 |
1973年 | 22篇 |
1972年 | 12篇 |
1971年 | 10篇 |
1970年 | 10篇 |
1969年 | 14篇 |
1968年 | 19篇 |
1967年 | 10篇 |
1966年 | 14篇 |
排序方式: 共有1088条查询结果,搜索用时 0 毫秒
221.
Signal frequency and shock probability as determinants of prolonged vigilance performance in rhesus monkeys 下载免费PDF全文
Norman A. Krasnegor Joseph V. Brady 《Journal of the experimental analysis of behavior》1972,17(1):113-118
The effects of changing signal frequency on a prolonged vigilance task were investigated by systematically increasing the average inter-trial interval between successive signals. During a 6-hr watch, vigilance performance remained constant when the rate of signal presentation was 40, 20, and 10 per hour. When the rate of signal presentation was reduced to 7 or 4 per hour, marked decrements in detection performance were observed. Similar vigilance decrements occurred when the average rate of signals per hour was kept constant (10 per hour) and the probability of receiving a shock for missing a signal was systematically varied. The results of this study indicate the importance of reinforcement factors in the control and maintenance of vigilance performance. 相似文献
222.
A collection of 220 paragraphs of graded value about U.S. presidents is given. The collection includes 16 paragraphs about each of nine presidents and 8 paragraphs about each of eight presidents. For each president, the paragraphs have one of four rough values for judgments of statesmanship, H, M+, M-, and L. These paragraphs have proved useful in experimental applications of integration theory to attitude change. Other advantages of U.S. history as a source of issues and material for research on attitudes are also pointed out. 相似文献
223.
A theoretical model was given for the size-weight illusion based on a principle of information integration. Judged heaviness of lifted weights was assumed to be an average of two pieces of information, weight and size, with the latter receiving negative weighting in the model formulation. Two experiments based on a Weight by Size design gave fair support to the parallelism prediction of the integration model. The hypothesis that Ss were really judging density was shown to imply a divergence prediction, contrary to the data. The theoretical analysis was generalized to include negative, positive, and comparative illusions; these were differentiated according to whether the contextual information was integrated with negative weighting, positive weighting, or served as a yardstick of judgment. 相似文献
224.
Norman Cliff 《Psychometrika》1970,35(2):163-178
Data are reported which show the statistical relation between the sample and population characteristic vectors of correlation matrices with squared multiple correlations as communality estimates. Sampling fluctuations were found to relate only to differences in the square roots of characteristic roots and to sample size. A principle for determining the number of factors to rotate and interpret after rotation is suggested.This study was supported by the National Science Foundation, Grant GB 4230. The author wishes to express his appreciation for the use of Western Data Processing Center and the Health Sciences Computing Facility, UCLA. He also thanks Dr. Roger Pennell for extremely valuable assistance in a number of phases of the study. 相似文献
225.
226.
The effectiveness of a one-shot intervention on the social, medical or medical/social consequences of smoking in deterring adolescent smoking was evaluated. Four hundred twenty adolescents completed surveys which measured attitudes, subjective norms, stereotypes, self-presentational beliefs regarding smoking, intentions to smoke, and smoking status at three points in time. The predictive ability of a Theory of Reasoned Behavior and of Impression Management Theory in determining adolescent smoking decisions was also assessed. 相似文献
227.
228.
Interrelationships among measures of intelligence and spontaneous flexibility were examined at two age levels using a multitrait-multimethod matrix design and other multivariate procedures. Measures of intelligence were Ravens Matrices and WAIS Vocabulary, WAIS Digit Symbol, and WAIS Similarities. Blots, Hidden Pictures, Brick Uses, and Impossibilities were used as measures of spontaneous flexibility. Subjects were 100 younger (X¯= 19.54,S.D.= 1.23) and 100 older (X¯= 63.99,S.D.= 2.94) men and women tested at two occasions. Adult age differences in factor structure were explored using a maximum likelihood analysis; common variances among the measures were greater for the elderly compared to the younger adults. Findings supported a dedifferentiation hypothesis with regard to both intelligence and spontaneous flexibility. 相似文献
229.
230.
Adjective-noun combinations in person perception are analyzed from an integration-theoretical view, with special reference to judgments of likableness, occupational proficiency, and social value. Different theoretical considerations are shown to apply to these three judgment dimensions, but all can be conceptualized in terms of the valuation and integration operations of integration theory. Experimental support for this conceptual analysis is given for likableness and occupational proficiency. Advantages of the integration-theoretical analysis over congruity formulations are pointed out. 相似文献