全文获取类型
收费全文 | 8914篇 |
免费 | 137篇 |
国内免费 | 7篇 |
专业分类
教育 | 6568篇 |
科学研究 | 527篇 |
各国文化 | 167篇 |
体育 | 718篇 |
综合类 | 3篇 |
文化理论 | 131篇 |
信息传播 | 944篇 |
出版年
2022年 | 53篇 |
2021年 | 83篇 |
2020年 | 153篇 |
2019年 | 231篇 |
2018年 | 304篇 |
2017年 | 330篇 |
2016年 | 309篇 |
2015年 | 232篇 |
2014年 | 252篇 |
2013年 | 1954篇 |
2012年 | 241篇 |
2011年 | 240篇 |
2010年 | 221篇 |
2009年 | 189篇 |
2008年 | 288篇 |
2007年 | 223篇 |
2006年 | 219篇 |
2005年 | 203篇 |
2004年 | 157篇 |
2003年 | 192篇 |
2002年 | 172篇 |
2001年 | 140篇 |
2000年 | 124篇 |
1999年 | 122篇 |
1998年 | 112篇 |
1997年 | 109篇 |
1996年 | 119篇 |
1995年 | 130篇 |
1994年 | 123篇 |
1993年 | 99篇 |
1992年 | 119篇 |
1991年 | 108篇 |
1990年 | 104篇 |
1989年 | 93篇 |
1988年 | 88篇 |
1987年 | 75篇 |
1986年 | 66篇 |
1985年 | 77篇 |
1984年 | 62篇 |
1983年 | 79篇 |
1982年 | 76篇 |
1981年 | 80篇 |
1980年 | 86篇 |
1979年 | 81篇 |
1978年 | 59篇 |
1977年 | 50篇 |
1976年 | 56篇 |
1975年 | 44篇 |
1974年 | 44篇 |
1971年 | 37篇 |
排序方式: 共有9058条查询结果,搜索用时 15 毫秒
971.
This paper compares the results of NCES and Carnegie surveys of postsecondary faculty to identify points of agreement and disagreement between them, and to contrast the respective survey results to other recent research on faculty. The two surveys utilized differently constructed samples, experienced different response rates, and employed different weighting schemes for purposes of analyzing and interpreting the results. Certain important inconsistencies in the results of the two surveys were observed and the paper provides a critical analysis of methodological and interpretive issues raised in a comparison of the surveys' results. 相似文献
972.
973.
974.
975.
976.
Adolescent adjustment measures may be related to each other and to the social environment in various ways. Are these relationships similar in genetic and environmental sources of covariation, or different? A multivariate behavior-genetic analysis was made of 6 adjustment and 3 treatment composites from the study Nonshared Environment in Adolescent Development, using 674 same-sex adolescent sibling pairs aged 9-11. Cholesky decompositions of the total covariance matrix yielded additive and nonadditive genetic, and shared and nonshared environmental matrices. Factor analyses led to 3 factors for all but shared environment. The first 2 factors resembled Neuroticism and Extraversion factors typically found for personality; the third factor, parental monitoring and control, appeared to have different associations in different matrices. 相似文献
977.
David F. Bjorklund Wolfgang Schneider Katherine Kipp Harnishfeger William S. Cassel Barbara R. Bjorklund Jean E. Bernholtz 《Contemporary educational psychology》1992,17(4)
High- and low-IQ children in the first, third, and fifth grades performed two free-recall tasks: a sort-recall task with sets of categorically related pictures, and a class-recall task, with children recalling the current members of their school class. All children were deemed to be experts concerning the composition of their school class, but, unlike experts in other domains, had no special motivation associated with their expertise. Recall and clustering on both tasks were high. The high-IQ children performed better than low-IQ children only on the sort-recall task. IQ was significantly correlated with measures of performance on the sort-recall task but not on the class-recall task. The results reflect the fact that the memory benefits associated with being an expert (here, elimination of IQ effects) are related to the greater knowledge the expert possesses and not to factors of motivation. 相似文献
978.
Robert D. Fitzgerald David L. Francisco James Metcalfe Maralee S. Lawson 《Learning & behavior》1984,12(2):217-222
Classical discrimination conditioning of heart rate (HR) and respiratory-motor (RM) activity was examined in 16 newborn (average age = 1 day) and 8 neonatal (average age = 2 weeks) pygmy goats over 4 days of conditioning involving an electric shock US and auditory CSs. On the 4th day, one-half of the animals in each group received a low to moderate dose of ethanol to test the resistance of the CRs to drug effects. Discriminated conditioning of RM activity but not HR occurred in the newborn group, indicating an absence of close coupling between skeletal-motor activity and HR at this early age. While the newborn group failed to show recognizable HR reactions to the CSs during the 4 days of testing, it did show a long-latency brady-cardia UR beginning at 2 days of age that may have been secondary to baroreceptor reflex actions. The neonatal group displayed conditioning of both HR and RM activity. The similar latencies of the two types of CRs during the CS suggested that they may have been related to each other. However, the fact that the RM CR developed a day before the HR CR, combined with the observation that ethanol modified the HR CR but not the RM CR, supports the view that there was considerable independence between the two types of CRs. 相似文献
979.
David F. Machell Ed.D. 《Innovative Higher Education》1991,16(2):173-185
This clinical treatise discusses this author's concept of “professorial melancholia,” a progressive emotional process characterized by the negating of a university professor's professional motivation, positive attitudinal focus, and adequate personal self-esteem. 相似文献
980.