全文获取类型
收费全文 | 9580篇 |
免费 | 174篇 |
国内免费 | 31篇 |
专业分类
9785篇 |
出版年
2012年 | 1076篇 |
2011年 | 1216篇 |
2010年 | 278篇 |
2009年 | 111篇 |
2008年 | 878篇 |
2007年 | 956篇 |
2006年 | 792篇 |
2005年 | 667篇 |
2004年 | 632篇 |
2003年 | 586篇 |
2002年 | 517篇 |
2001年 | 360篇 |
2000年 | 460篇 |
1999年 | 193篇 |
1998年 | 33篇 |
1997年 | 36篇 |
1996年 | 24篇 |
1995年 | 25篇 |
1994年 | 28篇 |
1993年 | 32篇 |
1992年 | 31篇 |
1991年 | 35篇 |
1990年 | 26篇 |
1989年 | 16篇 |
1988年 | 36篇 |
1987年 | 26篇 |
1986年 | 23篇 |
1985年 | 30篇 |
1984年 | 17篇 |
1983年 | 23篇 |
1982年 | 15篇 |
1981年 | 30篇 |
1980年 | 18篇 |
1979年 | 17篇 |
1978年 | 20篇 |
1976年 | 16篇 |
1965年 | 13篇 |
1963年 | 19篇 |
1959年 | 18篇 |
1958年 | 52篇 |
1957年 | 51篇 |
1956年 | 47篇 |
1955年 | 31篇 |
1954年 | 26篇 |
1953年 | 33篇 |
1952年 | 31篇 |
1951年 | 23篇 |
1950年 | 22篇 |
1949年 | 18篇 |
1948年 | 15篇 |
排序方式: 共有9785条查询结果,搜索用时 0 毫秒
21.
22.
23.
Although the Bender-Gestalt Visual Motor Test has been a popular and influential clinical assessment instrument for the last half century, authoritative opinion and a substantial research literature are often inconsistent or contradictory. This paper documents variations in designs, administration procedures, forms, and applications to particular populations. A careful review of scoring systems indicates the current status of objective approaches as contrasted with interpretation that is global, intuitive, and subjective. Some implications of these variations and interpretive procedures for training and assessment practice are discussed. The major conclusions of the review are summarized in seven points. 相似文献
24.
25.
26.
Interval and ratio reinforcement of a complex sequential operant in pigeons 总被引:2,自引:2,他引:0
下载免费PDF全文

Schwartz B 《Journal of the experimental analysis of behavior》1982,37(3):349-357
Pigeons were required to produce exactly four pecks on each of two keys in any order for reinforcement. Correct response sequences were reinforced on either fixed-interval two-minute or fixed-ratio four schedules, with each correct sequence treated as a single response. Each pigeon developed a particular dominant sequence that accounted for more than 80% of all sequences. Sequence stereotypy was relatively unaffected by the temporal properties of the fixed-interval and fixed-ratio schedules. Response time (time from the first response in each sequence to the last) was also relatively unaffected by the temporal properties of the schedules. In contrast, response latency (time from end of one sequence to the beginning of the next) was markedly affected by the schedules. Latencies were long early in the interreinforcement interval and got shorter as the interreinforcement interval progressed. These data suggest that stereotyped response sequences become functional behavioral units, resistant to disruption or alteration by reinforcement variables that ordinarily influence the temporal spacing of individual responses. 相似文献
27.
Data from a clinic sample of pregnant adolescents are analyzed for differences in fertility related variables between Mexican American and non Mexican. The independent variables are birthplace, ethnicity, and exposure to United States culture of Mexican and non Mexican adolescents. The dependent variables are talking about sex, pregnancy, birth control, hearing about birth control, and use of birth control. The data support the hypothesis that in the process of acculturation the fertility related behavior of immigrant Mexican adolescent females is affected by the indigenous United States Mexican culture rather than by United States Anglo culture. Implications for delivery of services are discussed. The delivery of fertility related services should take into account the cultural preferences of Mexican women, and should not involve coercion from legal or medical authorities. While liberation of Mexican American women, and accompanying changes in childbearing patterns may be desirable, these efforts should originate within the Mexican American community. Data is presented in tables on selected sample and subsample characteristics and compares fertility behaviors across ethnic groups, including Anglo, Black, US non-Mexican, and US Mexican. 相似文献
28.
在苏联,由于经济和社会关系的伟大革命改造,建成了发达的社会主义社会。苏联的生活方式决定了社会意识的普遍无神论化,因此,在苏联社会生活中,科学无神论的社会功能和文化功能得以充实和扩大,科学无神论同物质和精神实践的各方面、各领域的联系得以巩固和完善。在信教者中间,虔诚狂热的信徒逐渐减少,这类现象证明,宗教在我国社会中的影响正在减退。 相似文献
29.
Simultaneous observational recordings were made in vivo, via an observation mirror, and via closed circuit television. Three of nine observers had extensive experience recording behavior in vivo; three had extensive experience recording behavior via mirror; and three had extensive experience recording via television. Observers recorded nine categories of disruptive behavior for children in a special class setting. Frequencies of behavior recorded in vivo, via mirror, and via television differed significantly for only one category, vocalization. There were no significant main effects or interactions involving the observers' previous experience. Occurrence reliability coefficients computed within and between media demonstrated the similarity of observer agreement in all three media. Data collection procedures using an observational mirror or closed circuit television appear to be reasonable alternatives to in vivo observation in circumstances similar to those in the present study. 相似文献
30.
In this article, the authors present two laboratory experiments testing a group-level perspective on the role of empathy in helping. Experiment 1 tested the authors' predictions in an intercultural context of helping. Confirming their specific Empathy x Group Membership moderation hypothesis, empathy had a stronger effect on helping intentions when the helper and the target belonged to the same cultural group than when they belonged to different groups. Experiment 2 replicated these findings in a modified minimal group paradigm using laboratory-created groups. Moreover, this second experiment also provides evidence for the hypothesized psychological mechanisms underlying the empathy-(ingroup) helping relationship. Specifically, analyses in the ingroup condition confirmed that the strength of the empathy-(ingroup) helping relationship systematically varied as a function of perceived similarities among ingroup members. The general implications of these findings for empathy-motivated helping are discussed. 相似文献