全文获取类型
收费全文 | 6902篇 |
免费 | 409篇 |
国内免费 | 3篇 |
出版年
2021年 | 64篇 |
2020年 | 113篇 |
2019年 | 142篇 |
2018年 | 180篇 |
2017年 | 225篇 |
2016年 | 231篇 |
2015年 | 164篇 |
2014年 | 191篇 |
2013年 | 801篇 |
2012年 | 324篇 |
2011年 | 339篇 |
2010年 | 210篇 |
2009年 | 224篇 |
2008年 | 275篇 |
2007年 | 301篇 |
2006年 | 252篇 |
2005年 | 246篇 |
2004年 | 246篇 |
2003年 | 218篇 |
2002年 | 227篇 |
2001年 | 108篇 |
2000年 | 118篇 |
1999年 | 116篇 |
1998年 | 98篇 |
1997年 | 90篇 |
1996年 | 103篇 |
1995年 | 91篇 |
1994年 | 82篇 |
1993年 | 64篇 |
1992年 | 88篇 |
1991年 | 66篇 |
1990年 | 54篇 |
1989年 | 60篇 |
1988年 | 55篇 |
1987年 | 46篇 |
1986年 | 49篇 |
1985年 | 70篇 |
1984年 | 68篇 |
1983年 | 57篇 |
1982年 | 79篇 |
1981年 | 78篇 |
1980年 | 66篇 |
1979年 | 61篇 |
1978年 | 48篇 |
1977年 | 75篇 |
1976年 | 46篇 |
1975年 | 55篇 |
1974年 | 46篇 |
1973年 | 52篇 |
1972年 | 42篇 |
排序方式: 共有7314条查询结果,搜索用时 15 毫秒
91.
Murray Sidman Peter B. Rosenberger 《Journal of the experimental analysis of behavior》1967,10(5):467-478
Three keys were available for monkeys to press. The objective was to teach the animals to press the keys in sequences up to 10 members in length. With fading procedures, a light that cued the correct key at a given serial member of the sequence faded out slightly each time the animal selected it, and became slightly brighter after the animal made an error at that sequence member. The correct keys were faded out, starting from the end of the sequence and proceeding toward the beginning. With control procedures, the cue lights were turned off suddenly, rather than being faded gradually. In almost every instance, the animals learned a longer series of unlighted key positions with the fading procedures than they did when each key-light was turned off suddenly. Also, requiring the animals to press a series of keys cued by lights before they could reach the sequence members they were to learn hampered them in learning the later serial members. By using several different sequences, it was possible to replicate these findings within the individual animal. 相似文献
92.
The ability of young children to make kinaesthetic judgements of direction of line has been studied under recognition and detection conditions. Some children were not more accurate than chance when they were required to indicate the same one of a pair of mirror image obliques lines over a series of trials; these children could, however, detect whether two obliques were oriented in the same direction or in different directions. These latter data suggest that the poor recognition of mirror image obliques arises from deficiencies in spatial categorizing and not in input coding. This conclusion is supported by the finding that children who performed poorly on the kinaesthetic recognition of obliques performed poorly on the visual recognition of these figures. 相似文献
93.
94.
This paper presents the results from an investigation of the true probability distributions of the range of rank totals. A procedure for generating an approximation to the true distributions is also given. A comparison of the results of this approximation with an extensive criterion of generated true and sample distributions, and with other approximations is indicated. Accurate estimates of the critical ranges necessary to reach significance at three commonly used alpha levels, where the number of judges and items is less than or equal to sixteen, are presented in tabular form. 相似文献
95.
96.
INFANTS' PERCEPTION OF PHRASE STRUCTURE IN MUSIC 总被引:1,自引:0,他引:1
97.
Forced-choice scales were developed to measure the compatibility between worker preferences for job characteristics and actual characteristics of the job for purposes of predicting turnover and performance. The data confirmed the construct and criterion-related validity of the compatibility scores, but also indicated that the relationship between compatibility and voluntary termination was moderated by employee characteristics. Discussion centers on the implications of these findings for future job compatibility scale development and the application of this methodology to work settings where relatively homogeneous subgroups of employees differ with respect to personal and work circumstances.The authors thank the Public Opinion Laboratory of Northern Illinois University for supporting this research and Paula Howard, Robin Bebel, Alan Nordwall, and Barbara Zaitzow for their administrative assistance on this project. We also thank Gregory Sekowski and T.R. Biddle for their assistance on various aspects of the project. Finally, we thank all of the participants of the study without whom this research would not have been possible. 相似文献
98.
99.
This paper presents the ways in which psychology departments are using microcomputers for instruction, the types of facilities that they are using, and the varieties of hardware that they employ. These data are related to other data reported over the past 10 years. In addition, a summary of the types of software currently available in all areas of psychology is presented, and areas in which there is a need for further software development are identified. The information reviewed in this paper was compiled from the current software listings available through COMPSYCH, as well as the results of a survey distributed to registered users of COMPSYCH who hold academic positions. 相似文献
100.
Peter D. Mott 《Theoretical medicine and bioethics》1990,11(2):95-102
The issues involved in decision making about the aggressiveness of future medical care for older persons are explored. They are related to population trends, the heterogeneity of older persons and a variety of factors involved in individual preferences. Case studies are presented to illustrate these points, as well as a review of pertinent literature. The argument is offered that, considering these many factors, a system of flexible, individualized care by informed patient preference, is more rational than the rationing of technological services by age. 相似文献