全文获取类型
收费全文 | 989篇 |
免费 | 22篇 |
国内免费 | 2篇 |
专业分类
教育 | 771篇 |
科学研究 | 43篇 |
各国文化 | 11篇 |
体育 | 42篇 |
文化理论 | 13篇 |
信息传播 | 133篇 |
出版年
2022年 | 7篇 |
2020年 | 13篇 |
2019年 | 24篇 |
2018年 | 28篇 |
2017年 | 38篇 |
2016年 | 32篇 |
2015年 | 21篇 |
2014年 | 26篇 |
2013年 | 216篇 |
2012年 | 25篇 |
2011年 | 24篇 |
2010年 | 23篇 |
2009年 | 22篇 |
2008年 | 34篇 |
2007年 | 14篇 |
2006年 | 21篇 |
2005年 | 12篇 |
2004年 | 13篇 |
2003年 | 16篇 |
2002年 | 15篇 |
2001年 | 30篇 |
2000年 | 21篇 |
1999年 | 18篇 |
1998年 | 10篇 |
1997年 | 11篇 |
1995年 | 9篇 |
1994年 | 10篇 |
1993年 | 11篇 |
1992年 | 14篇 |
1991年 | 12篇 |
1990年 | 9篇 |
1989年 | 10篇 |
1987年 | 14篇 |
1986年 | 21篇 |
1985年 | 14篇 |
1984年 | 7篇 |
1983年 | 13篇 |
1982年 | 8篇 |
1980年 | 7篇 |
1979年 | 13篇 |
1978年 | 9篇 |
1977年 | 6篇 |
1976年 | 6篇 |
1975年 | 6篇 |
1974年 | 6篇 |
1973年 | 6篇 |
1972年 | 8篇 |
1970年 | 6篇 |
1969年 | 7篇 |
1966年 | 7篇 |
排序方式: 共有1013条查询结果,搜索用时 562 毫秒
21.
In five conditioned taste aversion experiments with rats, summation, retardation, and preference tests were used to assess the effects of extinguishing a conditioned saccharin aversion for three or nine trials. In Experiment 1, a summation test showed that saccharin aversion extinguished over nine trials reduced the aversion to a merely conditioned flavor (vinegar), whereas three saccharin extinction trials did not subsequently influence the vinegar aversion. Experiment 2 clarified that result, with unpaired controls equated on flavor exposure prior to testing; the results with those controls suggested that the flavor extinguished for nine trials produced generalization decrement during testing. In Experiment 3, the saccharin aversion reconditioned slowly after nine extinction trials, but not after three. Those results suggested the development of latent inhibition after more than three extinction trials. Preference tests comparing saccharin consumption with a concurrently available fluid (water in Experiment 4, saline in Experiment 5) showed that the preference for saccharin was greater after nine extinction trials than after three. However, saccharin preference after nine extinction trials was not greater, as compared with that for either latent inhibition controls (Experiments 4 and 5) or a control given equated exposures to saccharin and trained to drink saline at a high rate prior to testing (Experiment 5). Concerns about whether conditioned inhibition has been demonstrated in any flavor aversion procedure are discussed. Our findings help explain both successes and failures in demonstrating postextinction conditioned response recovery effects reported in the conditioned taste aversion literature, and they can be explained using a memory interference account. 相似文献
22.
Johnston Anderson 《Educational Studies in Mathematics》1989,20(2):165-177
Objective tests, such as multiple-choice and relationship analysis questions, are often used in mathematics to assess certain ranges of skills and abilities. This article examines the performance of men and women students in mathematics at university level and shows that there are significant differences between the sexes. 相似文献
23.
James R. Anderson 《Learning & behavior》1983,11(1):139-143
Two experiments examined the responses of infant stumptail macaques (Macaco arctoides) to mirror-image stimulation (MIS) during short social separations. Overall, infants living in pairs showed agitation when separated from their partners, but were calmer when the partner, an unfamiliar peer, or their own mirror image was visible. MIS elicited more facial expressions than the familiar peer, and more affiliative contact than an unfamiliar peer. In contrast, infants reared in a group were not calmed during separations either by an unfamiliar peer or by MIS, and they exhibited some negative reactions to the mirror. Social responsiveness to MIS varies with the social background of the subjects. 相似文献
24.
This longitudinal study explores the relationship of postpartum depression (PPD) and marital dysfunction on infant outcomes from birth to 2 1/2 years of age among middle-class, postpartum women. Participants were recruited during the prenatal period. Twelve mothers completed the study throughout a 2 1/2-year period. Questionnaires, semistructured interviews, and observations were used to collect data. Content analysis of the interviews (Morse & Field, 1995) was conducted and thematic patterns were identified. Clinical PPD and marital dysfunction (defined as little or no support or closeness, or verbal, emotional or physical abuse) characterized nearly one in three mothers. Four themes describing the women's postpartum progression were identified: stress, isolation, resentment, and eventual adjustment by creating a new normal. No major developmental delays or behavioral problems were found among the infants. Eight of the 12 mothers who were initially identified as breastfeeding nursed their infants for 6-18 months. Regardless of financial and educational advantages, mothers in the study experienced depression and marital dysfunction. These findings support other studies that confirm the lack of association of PPD with social class or marital status. Childbirth educators and other health care professionals are encouraged to continue providing expectant families with anticipatory education and community resources in order to increase awareness of mental health and marital risks during the postpartum transition. 相似文献
25.
26.
27.
28.
Shane R. Jimerson Gabrielle E. Anderson Angela D. Whipple 《Psychology in the schools》2002,39(4):441-457
The aim of this investigation is to provide a comprehensive review of dropout research that examines grade retention within both associative and predictive models. A systematic review of seventeen studies examining dropping out of high school prior to graduation demonstrates that grade retention is one of the most powerful predictors of dropout status. The discussion addresses the discrepancies among the perspectives of many educational professionals regarding the effectiveness of grade retention and deleterious long‐term correlates. The transactional model of development is presented, which emphasizes developmental trajectories over time, in order to facilitate the interpretation of the association between grade retention and school withdrawal. Educational professionals, teachers, researchers, parents, and policymakers considering the efficacy of grade retention are encouraged to consider the implications of these findings. © 2002 Wiley Periodicals, Inc. 相似文献
29.
Prenatal depression, violence, substance use, and perception of support in pregnant middle-class women 下载免费PDF全文
The purpose of this study was to explore the vulnerability for postpartum depression among financially, educationally, and socially advantaged middle-class women (n = 31). Twenty-nine percent reported prenatal depression, 13% reported intimate partner violence, and 22% reported concerns with partner relationships and support expectations after delivery. No illegal substances were reported; however, a past history of smoking and excessive use of caffeine was disclosed. Implications for practice focus on the need to screen and implement intervention programs for these social problems and to adopt measures as a universal standard of care for all women, regardless of demographic advantages. 相似文献
30.