全文获取类型
收费全文 | 4950篇 |
免费 | 70篇 |
国内免费 | 20篇 |
专业分类
教育 | 3341篇 |
科学研究 | 634篇 |
各国文化 | 29篇 |
体育 | 380篇 |
综合类 | 6篇 |
文化理论 | 33篇 |
信息传播 | 617篇 |
出版年
2022年 | 37篇 |
2021年 | 45篇 |
2020年 | 85篇 |
2019年 | 121篇 |
2018年 | 155篇 |
2017年 | 192篇 |
2016年 | 154篇 |
2015年 | 116篇 |
2014年 | 157篇 |
2013年 | 781篇 |
2012年 | 131篇 |
2011年 | 137篇 |
2010年 | 121篇 |
2009年 | 102篇 |
2008年 | 113篇 |
2007年 | 134篇 |
2006年 | 103篇 |
2005年 | 72篇 |
2004年 | 86篇 |
2003年 | 79篇 |
2002年 | 62篇 |
2001年 | 104篇 |
2000年 | 130篇 |
1999年 | 89篇 |
1998年 | 72篇 |
1997年 | 63篇 |
1996年 | 62篇 |
1995年 | 42篇 |
1994年 | 45篇 |
1993年 | 33篇 |
1992年 | 75篇 |
1991年 | 68篇 |
1990年 | 60篇 |
1989年 | 62篇 |
1988年 | 74篇 |
1987年 | 58篇 |
1986年 | 78篇 |
1985年 | 70篇 |
1984年 | 55篇 |
1983年 | 69篇 |
1982年 | 53篇 |
1981年 | 40篇 |
1980年 | 29篇 |
1979年 | 52篇 |
1978年 | 49篇 |
1977年 | 37篇 |
1976年 | 41篇 |
1975年 | 31篇 |
1974年 | 33篇 |
1973年 | 33篇 |
排序方式: 共有5040条查询结果,搜索用时 0 毫秒
901.
This paper investigates the conditions when a research joint venture (RJV) will involve a university as a research partner. We hypothesize that larger RJVs are more likely to invite a university to join the venture as a research partner than smaller RJVs because larger ventures are less likely to expect substantial additional appropriability problems to result because of the addition of a university partner and because the larger ventures have both a lower marginal cost and a higher marginal value from university R&D contributions to the ventures’ innovative output. We test this hypothesis using data from the COoperative REsearch (CORE) database, and those data confirm the hypothesis. 相似文献
902.
903.
Janice M. Hinson Kimberely N. LaPrairie 《Community College Journal of Research & Practice》2013,37(6):483-484
ABSTRACT The study reported in this paper examined the types of professional-development activities, support systems, and organizational structures necessary for community college faculty to make transitions from traditional teaching to Web-based teaching. Results indicate that (a) instructional change can by initiated through sustained professional development; (b) change is more meaningful and effective when it occurs in context over a sustained period of time; (c) faculty can embrace innovations when supported by knowledgeable professionals and their peers; and (d) students welcome the use of Web-based components in course work. The implications for practice may be useful to those wishing to increase faculty's online instructional competence. 相似文献
904.
George N. Shava 《Africa Education Review》2019,16(2):50-68
This article reports on a study of which the purpose was to understand the role of principals in changing underperforming schools towards sustainable improvement in one circuit area of North-West, South Africa. School principals play a crucial role in guiding schools towards sustainable improvement by shaping a vision of academic success for all learners. Managing teaching is one of the core modules in South Africa’s new national qualification for school principals, and that being the case, principals should play a central role in effecting the educational transformation of all learners. The quality of principals’ leadership is the key factor driving the transformational turnaround and improvement required in schools. They perform a highly complex and dynamic role in enhancing and sustaining school improvement. It was the goal of this qualitative study to explore cultural, structural, and agential challenges faced by principals in their effort to provide for change and improvement in their schools. Six schools were purposefully selected to participate in the study and semi-structured interviews were used to gather data from the principals. The study established that paying attention to cultural, structural and agential factors in schools increases their ability to sustain learner improvement. 相似文献
905.
An early admission procedure is the first step in adjusting formal educational programming to meet the educational, social, and emotional needs of intellectually advanced children. In view of the benefits to the child and potential benefits to society of meeting the intellectually advanced child's needs, it is important that school systems establish early admission policies. This article presents 12 guidelines for processing an early admission applicant. 相似文献
906.
907.
Behavior was studied in 15 rhesus monkeys mother-infant pairs, 5 of whom were exposed to delta-9-tetrahydrocannabinol continuously throughout gestation and the nursing period via drug treatment of mother (2.4 mg/kg/day). The drug-exposed mother-infant pairs were similar to nontreated controls in the amount and types displayed at 10 and 90 days of age, and adequate maternal care was demonstrated by all mothers. Drug-exposed pairs, however, showed no increase in interaction patterns that signal the onset of mother-infant independence at about 3 months of age. This finding suggests that mother-infant attachment may be a behavioral system that is particularly sensitive to modification by perinatal exposure to psychoactive drugs. 相似文献
908.
909.
910.
Next generation crosscutting themes: Factors that contribute to students' understandings of size and scale 下载免费PDF全文
Katherine Chesnutt Melissa Gail Jones Rebecca Hite Emily Cayton Megan Ennes Elysa N. Corin Gina Childers 《科学教学研究杂志》2018,55(6):876-900
This study examined the degree to which individual differences in students' (N = 232) concepts of size and scale are explained by factors such as students' innate sense of number, out‐of‐school science experiences, exposure to size and scale instruction, gender identities, and racial/ethnic identities. There is increasing emphasis being placed on the use of crosscutting concepts to promote deep learning in science. A multiple linear regression indicated students' racial/ethnic identities, experiences with scale outside of school, and exposure to size and scale instruction significantly added to the prediction model. Results from this study can both inform the movement toward incorporating crosscutting concepts into pedagogy as well as inform educators, administrators, and other stakeholders of the factors that may shape students' understanding of the cross‐cutting concept of scale, proportion, and quantity. 相似文献