全文获取类型
收费全文 | 6598篇 |
免费 | 282篇 |
国内免费 | 1篇 |
专业分类
6881篇 |
出版年
2023年 | 43篇 |
2022年 | 29篇 |
2021年 | 50篇 |
2020年 | 121篇 |
2019年 | 120篇 |
2018年 | 164篇 |
2017年 | 157篇 |
2016年 | 216篇 |
2015年 | 152篇 |
2014年 | 131篇 |
2013年 | 711篇 |
2012年 | 275篇 |
2011年 | 350篇 |
2010年 | 208篇 |
2009年 | 238篇 |
2008年 | 274篇 |
2007年 | 317篇 |
2006年 | 258篇 |
2005年 | 247篇 |
2004年 | 259篇 |
2003年 | 256篇 |
2002年 | 248篇 |
2001年 | 135篇 |
2000年 | 115篇 |
1999年 | 110篇 |
1998年 | 113篇 |
1997年 | 94篇 |
1996年 | 90篇 |
1995年 | 90篇 |
1994年 | 95篇 |
1993年 | 69篇 |
1992年 | 84篇 |
1991年 | 55篇 |
1990年 | 61篇 |
1989年 | 49篇 |
1988年 | 30篇 |
1987年 | 45篇 |
1986年 | 48篇 |
1985年 | 54篇 |
1984年 | 38篇 |
1983年 | 59篇 |
1982年 | 54篇 |
1981年 | 43篇 |
1980年 | 41篇 |
1979年 | 50篇 |
1978年 | 62篇 |
1977年 | 43篇 |
1976年 | 47篇 |
1975年 | 29篇 |
1973年 | 35篇 |
排序方式: 共有6881条查询结果,搜索用时 0 毫秒
161.
Using either a gas chromatography or an infrared absorption technique, series of blood alcohol concentrations (BACs) determined by breath tests were obtained from human subjects immediately subsequent to their having only oral contact with beverages ranging in ethyl alcohol concentration from 4% to 95% +. Times for total dissipation of mouth alcohol residuals to a level of practical nonsignificance ranged from 10 to 19 min. Dissipation rates were an inverse and approximately exponential function of the ethyl alcohol concentration of the beverage and were greatly shortened by rinsing the mouth with warm (34°C) water prior to testing. The results are discussed in terms of their relevance to the methodology of a number of research studies employing BAC breath-testing equipment. 相似文献
162.
163.
In a pilot study, a multielement design was used to assess the effectiveness of a response cost procedure on a 7-year-old child's hyperactive behavior and academic performance across days. The procedure was effective in reducing off-task behavior and in increasing academic assignment completion. In Experiment 2, three strategies were compared to a no-treatment baseline in treating an 8-year-old hyperactive child: drug (Ritalin) alone, response cost alone, and drug plus response cost. The cost program alone and the cost program combined with medication were effective in reducing off-task behavior and in increasing academic performance. In both studies, the procedure was viewed by the teachers as practical and effective for use in a classroom setting. The subjects liked the cost system and believed that they completed more academic work when it was operative. 相似文献
164.
Paul L. Harris Arne Kruithof Mark Meerum Terwogt Ton Visser 《Journal of experimental child psychology》1981,31(2):212-230
Children of 8 and 11 years were assessed in two experiments for their sensitivity to textual anomaly. In Experiment 1, subjects read stories containing two target lines, one appropriate and the other anomalous in relation to previously given information. Both age groups read the anomalous line more slowly than the appropriate line, but in a subsequent test of comprehension monitoring, the older group was more likely than the younger group to pick out the anomalous line as not fitting in with the rest of the story. Experiment 2 produced similar results: both 8- and 11-year-old children read an anomalous line more slowly, but 11-year-olds were more likely than 8-year-olds to cite the anomalous line or part of it when questioned about the possible presence of a line that did not fit in with the rest of the story. The results indicate that an age change in comprehension monitoring as indexed by citation or selection of a textual anomaly need not be contingent upon a parallel age change in constructive processing as indexed by modulation of reading rate. 相似文献
165.
166.
The way in which the apparent magnitude of numbers grows with their absolute magnitude was measured with a modified version of the direct technique Marks and Slawson (1966) used to determine the psychophysical exponent for loudness. This modified technique required subjects to estimate how evenly and randomly a sequence of integers appeared to sample the numerical continuum. The results indicate that the apparent magnitude of numbers increases with a decelerated power function of their arithmetic magnitude when a series samples from an open-ended range. However, when an upper boundary of the range is specified, the subjective scale seems to be linear. Random productions of numbers parallel the results found with judgments of presented sequences. The two scales of number provide the basis for an interpretation of the difference between magnitude and category scales: that subjects use numbers differently when the response scale is open-ended Imagnitude estimation than when it has a fixed upper limit tcategory scale. Given the assumption that subjects use numbers in this way in the two tasks, the qualitative relation between magnitude and category scales is predicted. 相似文献
167.
The perception of control may be established if an individual is provided with an opportunity to choose and if the outcome of the choice is moderately uncertain. In turn, perceived control has been shown to enhance motivation and performance. In the present experiment, the effects of uncertainty about environmental control were examined by measuring the speed with which choices were made. When control was implicitly provided, decision latencies were shorter than when control was either explicitly available or not available at all. Paradoxically, providing information about control may reduce uncertainty and thereby diminish the perception of control. The contribution of control and choice to the development of perceived control is discussed.This research is based on a thesis by the first author submitted in partial fulfillment of the master of science degree at Virginia Polytechnic Institute and State University and was supported by a grant from the U.S. Army Research Office to the second author. 相似文献
168.
Current research has suggested that musical stimuli are processed in the right hemisphere except in musicians, in whom there is an increased involvement of the left hemisphere. The present study hypothesized that the more musical training persons receive, the more they will rely on an analytic/left-hemispheric processing strategy. The subjects were 10 faculty and 10 student musicians, and 10 faculty and 10 student nonmusicians. All subjects listened to a series of melodies (some recurring and some not) and excerpts (some actual and some not) in one ear and, after a rest, to a different series of melodies in the other ear. The task was to identify recurring vs. nonrecurring melodies and actual vs. nonactual excerpts. For student musicians, there was a right-ear/left-hemispheric advantage for melody recognition, while for student nonmusicians, the situation was the reverse. Neither faculty group showed any ear preference. There were no significant differences for excerpt recognition. Two possible explanations of the faculty performance were discussed in terms of physical maturation and a functionally more integrated hemispheric approach to the task. 相似文献
169.
Contrast and undermatching as a function of reinforcer duration and quality during multiple schedules 总被引:1,自引:1,他引:0 下载免费PDF全文
Ettinger RH McSweeney FK Norman WD 《Journal of the experimental analysis of behavior》1981,35(3):271-282
Eight pigeons pecked keys under multiple variable-interval two-minute variable-interval two-minute schedules. In Experiment 1, the reinforcers were 2, 4, or 8 seconds access to a food magazine. In Experiments 2 and 3, the reinforcers were grains that had been determined to be most-, moderately-, or non-preferred. Both positive and negative behavioral contrast occurred when the reinforcers in one component were held constant and the duration or type of reinforcer obtained in the other component varied. Undermatching occurred when the relative rate of responding during a component was plotted as a function of the relative duration of the reinforcers in that component. 相似文献
170.
The influence of individuals on situations: Implications for understanding the links between personality and social behavior 总被引:2,自引:0,他引:2
Mark Snyder 《Journal of personality》1983,51(3):497-516
In an analysis of the nature and origins of predictability in social behavior, two propositions are considered: (1) There exist categories of individuals whose social behavior is readily predictable from measures of personal attributes such as attitudes, traits, and dispositions as well as categories of individuals whose social behavior is readily predictable from situational and interpersonal specifications of behavioral appropriateness; (2) underlying these differences in predictability are systematic choices to enter and to spend time in social settings and interpersonal contexts that promote and facilitate one or other of these characteristic behavioral orientations. The implications of these propositions for the study of personality and social behavior are considered in the specific case of the psychological construct of self-monitoring and in the general case of understanding the reciprocal influences of individuals and their social worlds. 相似文献