全文获取类型
收费全文 | 30273篇 |
免费 | 1155篇 |
国内免费 | 11篇 |
专业分类
31439篇 |
出版年
2019年 | 306篇 |
2018年 | 435篇 |
2017年 | 459篇 |
2016年 | 475篇 |
2015年 | 360篇 |
2014年 | 440篇 |
2013年 | 2271篇 |
2012年 | 785篇 |
2011年 | 833篇 |
2010年 | 558篇 |
2009年 | 515篇 |
2008年 | 754篇 |
2007年 | 690篇 |
2006年 | 668篇 |
2005年 | 559篇 |
2004年 | 564篇 |
2003年 | 567篇 |
2002年 | 592篇 |
2001年 | 819篇 |
2000年 | 817篇 |
1999年 | 643篇 |
1998年 | 306篇 |
1997年 | 319篇 |
1996年 | 315篇 |
1992年 | 586篇 |
1991年 | 548篇 |
1990年 | 541篇 |
1989年 | 502篇 |
1988年 | 514篇 |
1987年 | 487篇 |
1986年 | 539篇 |
1985年 | 517篇 |
1984年 | 457篇 |
1983年 | 400篇 |
1982年 | 292篇 |
1981年 | 314篇 |
1979年 | 495篇 |
1978年 | 372篇 |
1977年 | 325篇 |
1976年 | 347篇 |
1975年 | 407篇 |
1974年 | 519篇 |
1973年 | 544篇 |
1972年 | 413篇 |
1971年 | 435篇 |
1970年 | 397篇 |
1969年 | 434篇 |
1968年 | 501篇 |
1967年 | 477篇 |
1966年 | 463篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
171.
V Phares 《The American psychologist》1992,47(5):656-664
Compared with mothers, fathers are dramatically underrepresented in clinical child and adolescent research. The author reviewed empirical and theoretical clinical child and adolescent literature to ascertain the reasons for this underrepresentation. Four somewhat interrelated factors are discussed: practical issues in participant recruitment, differential base rates of paternal vs. maternal psychopathology, theory-driven research based on sexist theories, and research assumptions based on outdated societal norms. Suggestions for future research are discussed, including parallel investigations of paternal characteristics whenever maternal characteristics are investigated, assessment of both similarities and differences in the role of fathers and mothers in child and adolescent psychopathology, and investigation of parenting factors for both fathers and mothers (e.g., time spent in actual caretaking, career vs. family orientation) in relation to child and adolescent psychopathology. 相似文献
172.
173.
174.
175.
S Streufert R M Pogash J Roache D Gingrich R Landis W Severs L Lonardi A Kantner 《The Journal of applied psychology》1992,77(4):515-524
Adult men (N = 44) participated for 2 days (alcohol vs. placebo treatment) in a double-blind, crossover experiment. Performance on the Digit Symbol Substitution Task (DSST) and a visuomotor (VM) task was measured 4 times each day. On the alcohol-treatment day, data were obtained once during ascending breath alcohol levels (BALs), once during maximal BALs (0.05 or 0.10), and twice during descending BALs. Data were collected at the same time points on the placebo-treatment day. Limited evidence for acute tolerance was obtained with the DSST, but error rates on the VM task were higher during maximal and descending BALs. Error rates remained near placebo values, and participants displayed slightly greater caution, while BALs were ascending. Strategy scores on the VM task exceeded placebo scores during maximal intoxication. Data interpretation is focused on individuals in higher level (e.g., professional) positions. 相似文献
176.
The multiple and long-term effects of functional communication training relative to a common reductive procedure (time-out from positive reinforcement) were evaluated. Twelve children participated in a functional analysis of their challenging behaviors (Study 1), which implicated adult attention as a maintaining variable. The children were then matched for chronological age, mental age, and language age and assigned to two groups. One group received functional communication training as an intervention for their challenging behavior, and the second group received time-out as a contrast. Both interventions were initially successful (Study 2), but durable results were achieved only with the group that received functional communication training across different stimulus conditions (Study 3). Students whose challenging behaviors were previously reduced with time-out resumed these behaviors in the presence of naive teachers unaware of the children's intervention history. The value of teaching communicative responses to promote maintenance is discussed as it relates to the concept of functional equivalence. 相似文献
177.
178.
A variant of Ponzo's pattern was devised by drawing converging oblique lines at the ends of each of two horizontal lines that were located directly one above the other. Pairs of converging or diverging fins (either between or outside the horizontal shafts) were systematically removed. The results showed that, as predicted by integrative field theory, oblique lines between the shafts produced more distortion than did oblique lines outside the shafts. Also, it was shown that the attentive field construct in integrative field theory was crucial for predicting patterns of means and variances in this experiment. The modified Ponzo effect was shown to have much in common with the classical Müller-Lyer illusion. The subtle differences between the two were explained by proposing that the size of the optimum attentive field was larger in the Ponzo tasks than in the Müller-Lyer tasks because expansion fins are found on both shafts in the Ponzo-like figure. 相似文献
179.
D W Grantham 《Perception & psychophysics》1992,52(2):144-150
Thresholds for auditory motion detectability were measured in a darkened anechoic chamber while subjects were adapted to horizontally moving sound sources of various velocities. All stimuli were 500-Hz lowpass noises presented at a level of 55 dBA. The threshold measure employed was the minimum audible movement angle (MAMA)--that is, the minimum angle a horizontally moving sound must traverse to be just discriminable from a stationary sound. In an adaptive, two-interval forced-choice procedure, trials occurred every 2-5 sec (Experiment 1) or every 10-12 sec (Experiment 2). Intertrial time was "filled" with exposure to the adaptor--a stimulus that repeatedly traversed the subject's front hemifield at ear level (distance: 1.7 m) at a constant velocity (-150 degrees/sec to +150 degrees/sec) during a run. Average MAMAs in the control condition, in which the adaptor was stationary (0 degrees/sec,) were 2.4 degrees (Experiment 1) and 3.0 degrees (Experiment 2). Three out of 4 subjects in each experiment showed significantly elevated MAMAs (by up to 60%), with some adaptors relative to the control condition. However, there were large intersubject differences in the shape of the MAMA versus adaptor velocity functions. This loss of sensitivity to motion that most subjects show after exposure to moving signals is probably one component underlying the auditory motion aftereffect (Grantham, 1989), in which judgments of the direction of moving sounds are biased in the direction opposite to that of a previously presented adaptor. 相似文献
180.
Subjects presented with sets of three samples, two of distilled water and one of tap water, were significantly more consistent in choosing the tap water as preferable than they were in identifying it as the odd sample in the set. The result is opposite to the prediction of high-threshold models of sensory discrimination, which say that if a difference is not noticed, preferences will be random, whereas if a difference is noticed, preferences may still be in either direction. The result can be quantitatively explained by a model advanced by Frijters to explain an analogous anomaly found with the triangle test used in the food industry. Applying his model to the observed proportions yields essentially equivalent estimates of sensory difference (d' = 1.5, approximately) from the two tasks, and a direction of preference almost unanimously in favor of the tap water that was used. Since the model predicts that the proportion of subjects choosing the odd item will depart further from chance in the preference task than in the oddity task, the former has greater power to reject the null hypothesis of no sensory difference if one exists and if preference is overwhelmingly in one direction. 相似文献