全文获取类型
收费全文 | 105842篇 |
免费 | 3983篇 |
国内免费 | 44篇 |
专业分类
109869篇 |
出版年
2020年 | 1033篇 |
2019年 | 1320篇 |
2018年 | 2762篇 |
2017年 | 2652篇 |
2016年 | 2562篇 |
2015年 | 1403篇 |
2014年 | 1665篇 |
2013年 | 8072篇 |
2012年 | 3213篇 |
2011年 | 4003篇 |
2010年 | 2772篇 |
2009年 | 2436篇 |
2008年 | 3472篇 |
2007年 | 3612篇 |
2006年 | 2692篇 |
2005年 | 2460篇 |
2004年 | 2332篇 |
2003年 | 2158篇 |
2002年 | 2269篇 |
2001年 | 3194篇 |
2000年 | 3081篇 |
1999年 | 2351篇 |
1998年 | 1223篇 |
1997年 | 1080篇 |
1996年 | 1027篇 |
1995年 | 958篇 |
1993年 | 975篇 |
1992年 | 1961篇 |
1991年 | 1857篇 |
1990年 | 1810篇 |
1989年 | 1646篇 |
1988年 | 1620篇 |
1987年 | 1561篇 |
1986年 | 1641篇 |
1985年 | 1686篇 |
1984年 | 1408篇 |
1983年 | 1227篇 |
1982年 | 948篇 |
1979年 | 1432篇 |
1978年 | 1059篇 |
1975年 | 1221篇 |
1974年 | 1291篇 |
1973年 | 1378篇 |
1972年 | 1198篇 |
1971年 | 1077篇 |
1970年 | 964篇 |
1969年 | 999篇 |
1968年 | 1272篇 |
1967年 | 1178篇 |
1966年 | 1019篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
The present study presents a new, unit-weight scoring system for the Depressive Experiences Questionnaire (DEQ). One hundred thirty-one college students completed the DEQ, the Bem Sex-Role Inventory (BSRI), and the Beck Depression Inventory (BDI). The revised DEQ scales were shown to have substantial levels of internal consistency. The three subscales of the revised DEQ were significantly correlated with the BSRI masculinity and femininity scales but not with gender. Significant correlations were also obtained between DEQ anaclitic, DEQ introjective scales and the BDI. 相似文献
992.
The influence of perceived somatotype on stereotypes of behavior associated with body build was investigated among 160 male and 140 female Nigerian children in secondary school. In both groups, the perception of subjects' own physiques and discrepancy between their perceived and preferred physiques significantly explained the variance in the character trait scores attributed to body types. In general, the subjects attributed positive character traits to their perceived somatotypes and undesirable traits to the physiques with which they were dissatisfied. Thus, the perception of somatotype and discrepancy between perceived and preferred physique could significantly differentiate the character traits attributed to body build among male and female children. 相似文献
993.
In this study of the way 32 men and women between the ages of 60 to 90 coped with stressful situations, two instruments were used: the Life Experiences Survey and the Ways of Coping Checklist. Overall, health-related concerns were more frequently reported by older adults than any other stressful event. When coping responses were categorized according to four modes--intrapsychic, inaction, direct action, and information seeking--the Appalachian group was found to use the information-seeking mode; the Cherokee group, the intrapsychic mode. Significant differences were found between males and females in coping modes and life-stress categories. When groups were combined, significant correlations were noted between life stress, particularly health-related stress, and the coping modes of intrapsychic and information seeking. 相似文献
994.
Thirty-eight chronically mentally disabled patients who were invited to join a newly established, vocationally oriented, day treatment program in Raleigh, North Carolina, served as subjects. We attempted to determine whether demographic and psychosocial characteristics significantly differed among groups of clients who dropped out of, remained in, or refused membership in this community-support program. A variety of demographic, expectancy, psychological, and psychosocial measures were administered to each subject. Most significant was the finding that the subjects' perceived level of help and support from friends was a significant determinant of the level of program participation. Those subjects who refused to participate (refusers) perceived themselves as receiving proportionately less support than did members of the other two groups (dropouts and remainers). 相似文献
995.
Many counselors are currently undergoing a Kuhnian paradigm shift from linear models of behavioral problem conceptualization to systemic conceptual models. As a result, it has become incumbent on counselor-educators to introduce the systems concept of family therapy to their students within a framework that renders it meaningful not only intellectually but also practically. This paper presents one way of doing this successfully with master's level counselors-in-training who have no live families on which to practice. An overview of systems approaches to family therapy is presented along with a seven-stage supervision approach for teaching structural/strategic therapy in limited situations where the supervision of live families is not practical or possible. 相似文献
996.
997.
998.
999.
J A Dinsmoor 《Journal of the experimental analysis of behavior》1985,43(3):365-381
Early theorists (Skinner, Spence) interpreted discrimination learning in terms of the strengthening of the response to one stimulus and its weakening to the other. But this analysis does not account for the increasing independence of the two performances as training continues or for increases in control by dimensions of a stimulus other than the one used in training. Correlation of stimuli with different densities of reinforcement produces an increase in the behavior necessary to observe them, and greater observing of and attending to the relevant stimuli may account for the increase in control by these stimuli. The observing analysis also encompasses errorless training, and the selective nature of observing explains the feature-positive effect and the relatively shallow gradients of generalization generated by negative discriminative stimuli. The effectiveness of the observing analysis in handling these special cases adds to the converging lines of evidence supporting its integrative power and thus its validity. 相似文献
1000.
An infrared system for the detection of a pigeon''s pecks at alphanumeric characters on a TV screen: the dependency of letter detection on the predictability of one letter by another. 下载免费PDF全文
H D Clauson E J Izatt C P Shimp 《Journal of the experimental analysis of behavior》1985,43(2):257-264
Three pigeons pecked at letters of the alphabet and at the symbol "?" displayed on a computer-driven cathode ray screen. A 4 by 4 matrix of infrared emitting and detecting diodes and associated circuitry identified the location of a pigeon''s responses to the screen. Responses at the target letter T were probabilistically reinforced with food whenever T appeared in a string of three letters in the middle of the screen. Responses at the symbol "?" appearing below this string were probabilistically reinforced whenever T did not appear. The letter F anywhere in the three-character string either strongly predicted the occurrence of the target letter T, in two conditions, or predicted its nonoccurrence, in a third. This manipulation of the frequency with which the familiar letter F predicted T was shown to change the function relating probability of a correct peck at the symbol "?" to the number of Fs in the string. This effect may be interpreted as an instance of the phenomenon where an organism''s acquired knowledge changes what it sees. 相似文献