全文获取类型
收费全文 | 972篇 |
免费 | 8篇 |
国内免费 | 2篇 |
专业分类
教育 | 714篇 |
科学研究 | 51篇 |
各国文化 | 9篇 |
体育 | 67篇 |
综合类 | 2篇 |
文化理论 | 30篇 |
信息传播 | 109篇 |
出版年
2023年 | 7篇 |
2021年 | 7篇 |
2020年 | 12篇 |
2019年 | 19篇 |
2018年 | 33篇 |
2017年 | 29篇 |
2016年 | 26篇 |
2015年 | 18篇 |
2014年 | 17篇 |
2013年 | 249篇 |
2012年 | 12篇 |
2011年 | 21篇 |
2010年 | 14篇 |
2009年 | 18篇 |
2008年 | 17篇 |
2007年 | 18篇 |
2006年 | 16篇 |
2005年 | 20篇 |
2004年 | 16篇 |
2003年 | 27篇 |
2002年 | 28篇 |
2001年 | 18篇 |
2000年 | 22篇 |
1999年 | 16篇 |
1998年 | 14篇 |
1997年 | 15篇 |
1996年 | 10篇 |
1995年 | 10篇 |
1994年 | 13篇 |
1993年 | 8篇 |
1992年 | 15篇 |
1991年 | 12篇 |
1990年 | 11篇 |
1989年 | 11篇 |
1987年 | 13篇 |
1986年 | 7篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1983年 | 14篇 |
1982年 | 10篇 |
1981年 | 11篇 |
1980年 | 12篇 |
1979年 | 9篇 |
1977年 | 11篇 |
1976年 | 6篇 |
1974年 | 6篇 |
1973年 | 6篇 |
1971年 | 5篇 |
1967年 | 5篇 |
1966年 | 6篇 |
排序方式: 共有982条查询结果,搜索用时 15 毫秒
11.
12.
Pavlo D. Antonenko Craig A. Ogilvie Dale S. Niederhauser John Jackman Piyamart Kumsaikaew Rahul R. Marathe Sarah M. Ryan 《Education and Information Technologies》2011,16(4):323-342
This paper describes the ways that students’ problem-solving behaviors evolve when solving multi-faceted, context-rich problems
within a web-based learning environment. During the semester, groups of two or three students worked on five physics problems
that required drawing on more than one concept and, hence, could not be readily solved with simple “plug-and-chug” strategies.
The problems were presented to students in a data-rich, online problem-based learning environment that tracked which information
items were selected by students as they attempted to solve the problem. The students also completed a variety of tasks, like
entering an initial qualitative analysis of the problem into an online form. Students were not constrained to complete these
tasks in any specific order. As they gained more experience in solving context-rich physics problems, student groups showed
some progression towards expert-like behavior as they completed qualitative analysis earlier and were more selective in their
perusal of informational resources. However, there was room for more improvement as approximately half of the groups still
completed the qualitative analysis task towards the end of the problem-solving process rather than at the beginning of the
task when it would have been most useful to their work. 相似文献
13.
The genetic and environmental etiologies of diverse aspects of language ability and disability, including articulation, phonology, grammar, vocabulary, and verbal memory, were investigated in a U.K. sample of 787 pairs of 4.5-year-old same-sex and opposite-sex twins. Moderate genetic influence was found for all aspects of language in the normal range. A similar pattern was found at the low end of the distribution with the exception of two receptive measures. Environmental influence was mainly due to nonshared factors, unique to the individual, with little influence from shared environment for most measures. Genetic and environmental influences on language ability and disability are quantitatively and qualitatively similar for males and females. 相似文献
14.
Photoresist technology, which is used for micro-patterning exploits changes in properties of polymeric materials, such as their solubility or volatility, upon photo-irradiation. This process has greatly benefitted from the knowledge base of organic chemistry and photo-induced organic transformations. The role of chemistry in the development of photoresists is described in this article. 相似文献
15.
Stephen J. Bagnato Hoi K. Suen Dale Brickley Janell Smith-Jones Ernie Dettore 《Early childhood research quarterly》2002,17(4):117
The national debate surrounding the issue of school failure has renewed interest in the quality, efficacy, and outcomes of early childhood intervention programs that can promote early school success for children at developmental risk. Moreover, researchers and policymakers report the need to document developmentally-appropriate models for assessing and evaluating early childhood outcomes. We report on the first-phase results of Pittsburgh’s early childhood initiative (ECI). ECI is a privately-funded effort by a consortium composed of the business, corporate, foundation, and community sectors to implement high-quality early care and education options for children in high-risk neighborhoods. The overarching objective of ECI is to ensure early school success for high-risk children. Our Scaling Progress in Early Childhood Settings (SPECS) Evaluation Team implemented an authentic assessment and program evaluation strategy and an enhanced “constructed comparison group” statistical model to conduct longitudinal research on the child developmental impact of the ECI model. First-phase results on 155 high-risk children indicate that those who participated in high-quality ECI programs for the longest periods of time demonstrated patterns of progress that exceeded maturational expectations. Weekly collaborative consultation to teachers and caregivers by consultants about program quality using the National Association for the Education of Young Children (NAEYC) standards as “best practice” benchmarks seemed to be associated with initial enhanced child outcomes and the particular impact of the ECI model. 相似文献
16.
17.
Regressing adjusted grade-point averages on freshman SAT scores and high school grade-point averages results in large increases
in the incremental predictive validity of the SAT. Even so, the SAT still changes no more than a small proportion of admissions
decisions and does not result in substantively important increases in freshman grades. The test does, however, change the
composition of the freshman class by altering acceptances to some major areas of study and by limiting the access of women
and blacks. 相似文献
18.
The purpose of this critical analysis was to investigate the young children’s sense of numerical magnitudes and the important attributes of classrooms where children in kindergarten and first grade are exposed to mathematics. This study aimed to offer guidelines that will assist teachers as they teach mathematics to children between the ages of five and seven. 相似文献
19.
Fourteen behavioral measures were ranked according to their ability to differentiate performances of a wild population of mice from three domestic inbred strains. These “wildness” rankings were then analyzed for their ability to predict genetic and Genotype by Environment interactions. Genetic parameters were derived from analysis of three inbred domestic strains and their three hybrid crosses via the diallel technique of genetic analysis. Genotype by Environment interactions were assessed both as mean differences in stock performances resulting from rearing in a laboratory vs naturalistic environment and as differences in environmental variability within stock genotypes. Behavioral characters ranking high on “wildness” failed to demonstrate any unitary pattern of Genotype by Environment interactions. The diallel genetic analysis revealed many examples of additive variation but relatively few examples of dominant variation. An extremely wide range of interactions occurred between genotype and rearing environments, with “wildness” and “developmental homeostasis” concepts both failing to account for all the observed interactions. 相似文献
20.