全文获取类型
收费全文 | 1735篇 |
免费 | 241篇 |
出版年
2024年 | 2篇 |
2023年 | 38篇 |
2022年 | 7篇 |
2021年 | 8篇 |
2020年 | 100篇 |
2019年 | 24篇 |
2018年 | 23篇 |
2017年 | 83篇 |
2016年 | 99篇 |
2015年 | 82篇 |
2014年 | 92篇 |
2013年 | 357篇 |
2012年 | 72篇 |
2011年 | 47篇 |
2010年 | 53篇 |
2009年 | 83篇 |
2008年 | 61篇 |
2007年 | 47篇 |
2006年 | 60篇 |
2005年 | 31篇 |
2004年 | 31篇 |
2003年 | 21篇 |
2002年 | 24篇 |
2001年 | 8篇 |
2000年 | 11篇 |
1999年 | 16篇 |
1998年 | 17篇 |
1997年 | 9篇 |
1996年 | 50篇 |
1995年 | 32篇 |
1994年 | 26篇 |
1993年 | 34篇 |
1992年 | 36篇 |
1991年 | 39篇 |
1990年 | 35篇 |
1989年 | 26篇 |
1988年 | 19篇 |
1987年 | 15篇 |
1986年 | 17篇 |
1985年 | 7篇 |
1984年 | 10篇 |
1983年 | 2篇 |
1982年 | 14篇 |
1981年 | 17篇 |
1980年 | 19篇 |
1979年 | 16篇 |
1978年 | 25篇 |
1977年 | 23篇 |
1974年 | 3篇 |
1971年 | 2篇 |
排序方式: 共有1976条查询结果,搜索用时 62 毫秒
81.
Most adults of average and superior intelligence incorrectly assume that in a two dimensional figure two attributes, area, and perimeter, are locked in a fixed relationship such that if one remains unchanged so does the other. Consequently, when they correctly conserve one attribute during shape transformation, they incorrectly conserve the other. Mentally retarded individuals assume no such fixed relationship but depend exclusively on perceptual information. Although this dependence adversely effects their judgment of conservation, it allows them to correctly judge the changed state of the nonconserved attribute. 相似文献
82.
Stanley Kaye PhD 《Journal of Contemporary Psychotherapy》1982,13(2):175-181
Adoption of a child is an event in which a number of crises have converged. Both the biologic and adoptive families have contributed their failures and crises, and the subsequent interpretations of these by the adopted child can lead to polarized themes of goodness and badness. The absence of the biologic parents and of a coherent history reinforces the tendency to splitting. This paper explores these operations and raises questions about prevailing adoption practices.Paper presented at Spence-Chapin Symposium on Identity Problems of Children in Non-Nuclear Families, April 11, 1981. 相似文献
83.
Suzanne V Borys Herman H Spitz Barbara A Dorans 《Journal of experimental child psychology》1982,33(1):87-110
Three experiments were conducted with the Tower of Hanoi task to assess problem solving ability in 6-, 7-, 8-, and 10-year-old nonretarded children and mentally retarded young adults of varying maturational ages. In Experiment 1 we gradually reduced the number of moves required for solution until subjects could solve the 3-disk tower-ending problem. Although all groups experienced difficulty with the standard 7-move problem, all but the trainable retarded group readily solved the 6-move problem. The trainable group did not reach a comparable level of success until the 4-move problem. On the 7-move problem the retarded groups performed at the level of nonretarded groups that were maturationally to 3 years younger. An analysis of first moves indicated that subject groups differed in the strategies they used to solve the problems. In Experiment 2, practice effects were ruled out as a source of the superior performance on the 6- than on the 7-move problem. In Experiment 3, 7- and 10-year-old nonretarded children and mentally retarded young adults did not differ on 5-move problems in which configuration of the goal states was varied. A comparison of all 5-move problems judged to have the same depth of search requirements indicated that the tower-ending problems were significantly easier to solve than the partial-tower-ending problems, which in turn were easier than the flat-ending problems. A limited depth of search capacity sets boundaries on the use of sophisticated strategies and, to a large extent, accounts for the retarded groups' maturational lag. 相似文献
84.
Emory L. Cowen PhD Ellis L. Gesten Alice B. Wilson 《American journal of community psychology》1979,7(3):293-303
This study evaluated the effectiveness of the Primary Mental Project (PMHP), a program for early detection and prevention of school adjustment problems. Pre- and postprogram assessments were done with 215 primary-grade children seen in PMHP, usig teacher ratings of problem behaviors and competencies, and child-aide ratings of problems. School mental health professionals judged educational and behavioral changes in project children during the year. Significant across-the board improvements were found on all criterion measures. Modest intercorrelations among criterion change estimates suggested that the observed changes were due to program, rather than halo, effects. PMHP children also improved significantly more than matched, retrospective controls. 相似文献
85.
A microprocessor system can be used both to control aversive conditioning (classical, signaled and Sidman avoidance, and conflict) experiments and to acquire behavioral data in multiple subjects at a fraction of the cost of solid state systems. The software described in this paper can be used to program tones and shocks and count responses, independently, in up to 12 animals simultaneously. 相似文献
86.
87.
88.
Carmen Knudson-Martin PhD 《Contemporary Family Therapy》1992,14(3):241-258
This study uses an interpretive interview method to examine the micro-processes of generational continuity and change among a group of social activists. Boszormenyi-Nagy's theory of responsibility between generations, alternative models outside the family, and choice are used to explain the instances of change. Implications for research and practice are addressed. 相似文献
89.
Nancy L. Segal PhD 《Suicide & life-threatening behavior》2009,39(6):569-575
Genetically informative samples can address hereditary and experiential influences on suicide‐related behaviors. The frequency of suicide‐related behaviors was compared in twins from two survivor groups: (1) those whose co‐twins' deaths were suicides (monozygotic [MZ]: n = 47; dizygotic [DZ]: n = 31), and (2) those whose co‐twins' deaths were nonsuicides (MZ: n = 347; DZ: n = 170). The frequency of suicide attempts among suicide survivors was significantly higher in MZ than DZ twins, while the frequency of suicide attempts among nonsuicide twin survivors did not differ between MZ and DZ twins. Twin concordance for suicide attempts more likely reflects a genetic predisposition than a behavioral reaction to the loss. 相似文献
90.