全文获取类型
收费全文 | 2006篇 |
免费 | 27篇 |
国内免费 | 2篇 |
专业分类
教育 | 1455篇 |
科学研究 | 199篇 |
各国文化 | 35篇 |
体育 | 119篇 |
综合类 | 1篇 |
文化理论 | 24篇 |
信息传播 | 202篇 |
出版年
2023年 | 15篇 |
2021年 | 27篇 |
2020年 | 42篇 |
2019年 | 55篇 |
2018年 | 50篇 |
2017年 | 77篇 |
2016年 | 71篇 |
2015年 | 42篇 |
2014年 | 42篇 |
2013年 | 436篇 |
2012年 | 31篇 |
2011年 | 40篇 |
2010年 | 42篇 |
2009年 | 48篇 |
2008年 | 61篇 |
2007年 | 24篇 |
2006年 | 39篇 |
2005年 | 35篇 |
2004年 | 32篇 |
2003年 | 29篇 |
2002年 | 28篇 |
2001年 | 34篇 |
2000年 | 26篇 |
1999年 | 21篇 |
1998年 | 18篇 |
1997年 | 13篇 |
1996年 | 19篇 |
1995年 | 22篇 |
1994年 | 24篇 |
1993年 | 13篇 |
1992年 | 21篇 |
1991年 | 18篇 |
1990年 | 31篇 |
1989年 | 18篇 |
1988年 | 15篇 |
1987年 | 16篇 |
1986年 | 22篇 |
1985年 | 31篇 |
1984年 | 14篇 |
1983年 | 14篇 |
1981年 | 25篇 |
1980年 | 13篇 |
1979年 | 14篇 |
1977年 | 19篇 |
1976年 | 14篇 |
1975年 | 13篇 |
1974年 | 15篇 |
1973年 | 14篇 |
1972年 | 13篇 |
1968年 | 13篇 |
排序方式: 共有2035条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
95.
We describe a microfluidic device for on-chip chemical processing, such as staining, and subsequent washing of cells. The paper introduces “separator walls” to increase the on-chip incubation time and to improve the quality of washing. Cells of interest are concentrated into a treatment stream of chemical reagents at the first separator wall for extended on-chip incubation without causing excess contamination at the output due to diffusion of the unreacted treatment chemicals, and then are directed to the washing stream before final collections. The second separator wall further reduces the output contamination from diffusion to the washing stream. With this approach, we demonstrate on-chip leukocyte staining with Rhodamine 6G and washing. The results suggest that other conventional biological and analytical processes could be replaced by the proposed device. 相似文献
96.
Hyunjin Seo Joseph Erba Darcey Altschwager Mugur Geana 《Journal of Applied Communication Research》2019,47(2):130-152
Based on our community engagement project involving 47 older, low-income African-American adults from a senior community center, this study analyzes how an underserved population acquires knowledge and skills related to digital technologies. We discuss the conceptualization, implementation, and evaluation of a weekly, four-month long computer class for members of the senior community center. Our mixed-method research shows the importance of taking into account both the multidimensional nature of adult learning and the social and cultural contexts in which learning occurs when working with underserved adult populations. Findings from our formative and evaluative research offer insights into changes in the computer class participants’ attitudes toward and perspectives on key digital literacy issues including security and privacy online and online information verification. Scholarly and policy implications are discussed in the context of digital competency and adult learning for marginalized populations. 相似文献
97.
98.
Perceptions of adolescent–parent and adolescent–peer relationship qualities, and adolescents’ attachment states of mind were examined as predictors of adult social and romantic relationship quality, depressive symptoms, and work performance. Adolescents (86 male, 98 female; 58% White, 29% African American, 8% mixed race/ethnicity, 5% other groups) were followed from age 13 to 24 via observational, self-, parent-, and close friend-reports. Adolescent close friendship quality was a significantly better predictor of adult peer and romantic outcomes, work performance, and depressive symptoms than parental reports of the parent–teen relationship; attachment security was also a strong predictor of numerous outcomes. Results are interpreted as reflecting the difficulty for parents judging parent–teen relationship quality and as reflecting the growing importance of close friendships during this period. 相似文献
99.
In both the literature on inclusive education and in international policy development, there has been considerable interest in the use of sets of indicators for the implementation of inclusive education at national and local levels. Drawing on sets of indicators developed in Europe and the Pacific Islands, this study proposes a set of such indicators for Kuwait. These indicators are then presented in a survey of 161 special education teachers working in public elementary mainstream schools across Kuwait. Analysis of the results is used to explore how such indicators could play a role in promoting policy implementation for inclusive education in Kuwait and more widely in Gulf Cooperation Council (GCC) countries. 相似文献
100.