全文获取类型
收费全文 | 5196篇 |
免费 | 289篇 |
国内免费 | 10篇 |
专业分类
5495篇 |
出版年
2023年 | 53篇 |
2022年 | 53篇 |
2021年 | 65篇 |
2020年 | 133篇 |
2019年 | 149篇 |
2018年 | 196篇 |
2017年 | 180篇 |
2016年 | 227篇 |
2015年 | 131篇 |
2014年 | 165篇 |
2013年 | 585篇 |
2012年 | 244篇 |
2011年 | 293篇 |
2010年 | 181篇 |
2009年 | 184篇 |
2008年 | 267篇 |
2007年 | 264篇 |
2006年 | 222篇 |
2005年 | 197篇 |
2004年 | 185篇 |
2003年 | 189篇 |
2002年 | 169篇 |
2001年 | 85篇 |
2000年 | 72篇 |
1999年 | 63篇 |
1998年 | 58篇 |
1997年 | 43篇 |
1996年 | 45篇 |
1995年 | 50篇 |
1994年 | 51篇 |
1993年 | 40篇 |
1992年 | 42篇 |
1991年 | 32篇 |
1990年 | 34篇 |
1989年 | 32篇 |
1988年 | 32篇 |
1987年 | 24篇 |
1986年 | 30篇 |
1985年 | 33篇 |
1984年 | 32篇 |
1983年 | 30篇 |
1982年 | 25篇 |
1980年 | 27篇 |
1979年 | 25篇 |
1978年 | 36篇 |
1977年 | 23篇 |
1976年 | 21篇 |
1975年 | 19篇 |
1974年 | 21篇 |
1973年 | 20篇 |
排序方式: 共有5495条查询结果,搜索用时 0 毫秒
41.
Eric W. Holman 《Psychometrika》1972,37(4):417-423
In one well-known model for psychological distances, objects such as stimuli are placed in a hierarchy of clusters like a phylogenetic tree; in another common model, objects are represented as points in a multidimensional Euclidean space. These models are shown theoretically to be mutually exclusive and exhaustive in the following sense. The distances among a set ofn objects will be strictly monotonically related either to the distances in a hierarchical clustering system, or else to the distances in a Euclidean space of less thann — 1 dimensions, but not to both. Consequently, a lower bound on the number of Euclidean dimensions necessary to represent a set of objects is one less than the size of the largest subset of objects whose distances satisfy the ultrametric inequality, which characterizes the hierarchical model.This work was supported in part by Grant GB-13588X from the National Science Foundation. I would like to thank L. M. Kelly and A. A. J. Marley for their helpful comments and suggestions. 相似文献
42.
The plastic barrel suit provides complete protection of chronically implanted fistulas and electrical connectors. The lost time, expense, and the frustrations of having these devices damaged was avoided. 相似文献
43.
George A. Gescheider John H. Wright Barry J. Weber Bruce M. Kirchner Eric A. Milligan 《Attention, perception & psychophysics》1969,5(1):18-20
Three Ss made judgments of the presence or absence of a burst of 60-cps vibration onthe index fingertip.The probability of S’s reporting the presence of a signal was found to be influenced by signal probability and signal intensity. Mean reaction time for reporting the presence of a signal decreased as a function of signal intensity and signal probability whereas mean reaction time for reporting the absence of a signal increased as a function of signal intensity and signal probability. On trials where no signal was presented mean R T for reporting a signal decreased with increases in the signal probability whereas mean RT for reporting the absence of a signal increased with increases in signal probability. The results were interpreted as support for the hypothesis that S’s decision time was longer the closer on the sensory continuum a particular observation was to his criterion. 相似文献
44.
Wayne Lee 《Psychometrika》1966,31(3):397-412
A method of design symbolization (DS) is given for a class of designs in which all factors are related by complete crossing or by nesting. Characterization of acceptable DS's, and logical relational properties are given. It is shown how the design model can be obtained from the DS.The preparation of this article was supported by NIH Grant GM-11128, and by grants to the Institute of Human Learning by NSF and NIH. 相似文献
45.
46.
Evelyn Lee Teng 《Behavior research methods》1990,22(4):389-392
The 3RT Test consists of a simple, a choice, and a conditional reaction time (RT) task. The three tasks involve comparable visual stimuli and require identical manual responses, but they differ in the complexity of cognitive processing required. The nonverbal stimuli convey commonly known meanings. Responses can be made either on the keyboard or on response keys connected to the computer’s serial port. The computer’s internal timer/counter is used for millisecond timing. The test administration program allows flexible setting of the test conditions. The data analysis program provides summary data not only for each RT task as a whole, but also for separate trial types within each task. Summary statistics include measures of variation and central value that are not affected by extreme scores. In addition to laboratory studies with normal adults, the 3RT Test is suitable for life-span developmental studies, cross-cultural comparisons, and other uses in various clinical settings. 相似文献
47.
In this paper, we describe software that turns a Macintosh computer into an off-the-shelf tool for experiments on visual search. Our design goals included portability (between members of the Macintosh computer family and between various research settings), user-friendliness (equivalent to Macintosh programming standards), flexibility (to allow replication and extension of important experiments on visual search), and adaptability (very short design-to-data and data-to-analysis turnaround times). We describe how the software meets these goals in three major phases of an experiment: stimulus construction, experimental control, and statistical analysis. We then list several landmark studies of visual search that can be easily designed and extended with the software. Finally, we outline plans for expanding the experimental variations that will be supported in future versions of the software. 相似文献
48.
49.
50.
Eric P. Ochs Marta Meana Kenneth Mah Yitzchak M. Binik 《Behavior research methods》1993,25(2):189-194
Sexpert, an expert computer program designed to counsel couples on their sexual relationships, was evaluated. Eighty-one heterosexual couples were assigned to one of three experimental manipulations (Sexpert, video, and self-help book) or a control condition. Daily sexual behavior monitoring forms and structured retrospective reports served as measures of baseline and post-manipulation behavior. Daily monitoring of sexual behavior failed to show significant changes occurring after the manipulations. However, retrospective data concerning the postmanipulation period show that compared with the control, the Sexpert, video, and book manipulations had a significant positive impact on couples’ sexual behavior, communication, and learning about sexuality. Sexpert, video, and book were similarly evaluated, except that Sexpert was evaluated as more engaging. In addition, subjects retrospectively reported positive changes in communication, relationship satisfaction, and sexual behavior during the baseline period. This suggests that daily behavioral monitoring is intrusive and may confound the variables measured by it. 相似文献