全文获取类型
收费全文 | 7207篇 |
免费 | 113篇 |
国内免费 | 76篇 |
专业分类
教育 | 4883篇 |
科学研究 | 680篇 |
各国文化 | 51篇 |
体育 | 710篇 |
综合类 | 219篇 |
文化理论 | 73篇 |
信息传播 | 780篇 |
出版年
2022年 | 52篇 |
2021年 | 114篇 |
2020年 | 115篇 |
2019年 | 157篇 |
2018年 | 167篇 |
2017年 | 188篇 |
2016年 | 182篇 |
2015年 | 195篇 |
2014年 | 273篇 |
2013年 | 1154篇 |
2012年 | 325篇 |
2011年 | 335篇 |
2010年 | 354篇 |
2009年 | 333篇 |
2008年 | 317篇 |
2007年 | 319篇 |
2006年 | 298篇 |
2005年 | 224篇 |
2004年 | 195篇 |
2003年 | 146篇 |
2002年 | 181篇 |
2001年 | 132篇 |
2000年 | 153篇 |
1999年 | 100篇 |
1998年 | 82篇 |
1997年 | 84篇 |
1996年 | 88篇 |
1995年 | 73篇 |
1994年 | 78篇 |
1993年 | 67篇 |
1992年 | 54篇 |
1991年 | 77篇 |
1990年 | 56篇 |
1989年 | 50篇 |
1988年 | 42篇 |
1987年 | 49篇 |
1986年 | 48篇 |
1985年 | 48篇 |
1984年 | 49篇 |
1983年 | 43篇 |
1982年 | 33篇 |
1981年 | 37篇 |
1980年 | 31篇 |
1979年 | 25篇 |
1978年 | 34篇 |
1977年 | 43篇 |
1976年 | 29篇 |
1975年 | 23篇 |
1974年 | 24篇 |
1972年 | 14篇 |
排序方式: 共有7396条查询结果,搜索用时 15 毫秒
31.
32.
Peter Banks 《Learned Publishing》2004,17(2):135-142
The benefits claimed for open access publishing in the medical area are subjected to evaluation and question. It is represented that these benefits are, in many cases, illusory or doubtful. 相似文献
33.
Analyzing 219 blog posts from 52 self-employed women lifestyle bloggers in North America, this study shows how these digital professionals navigate tensions and communicatively constitute work flexibility. In their narratives, women bloggers employed tension management approaches such as reframing, continual connections, and reflective practice in response to tensions in enacting temporal–spatial, identity, and financial flexibility. Specifically, women followed oxymoronic constructions – disciplined freedom, branded authenticity, and dependable independence – to embrace and transform competing poles of fluidity?structure, authenticity?marketability, and independence?interconnection. Expanding work–life research to the self-employed digital labor context, this study responds to recent calls to uncover more-than tension management strategies in empirical settings and contributes to a tension-centered, contextual, and processual analysis of workplace flexibility construction. 相似文献
34.
The purpose of this study is to find a theoretically grounded, practically applicable and useful granularity level of an algorithmically constructed publication-level classification of research publications (ACPLC). The level addressed is the level of research topics. The methodology we propose uses synthesis papers and their reference articles to construct a baseline classification. A dataset of about 31 million publications, and their mutual citations relations, is used to obtain several ACPLCs of different granularity. Each ACPLC is compared to the baseline classification and the best performing ACPLC is identified. The results of two case studies show that the topics of the cases are closely associated with different classes of the identified ACPLC, and that these classes tend to treat only one topic. Further, the class size variation is moderate, and only a small proportion of the publications belong to very small classes. For these reasons, we conclude that the proposed methodology is suitable to determine the topic granularity level of an ACPLC and that the ACPLC identified by this methodology is useful for bibliometric analyses. 相似文献
35.
Many studies demonstrate differences in the coverage of citing publications in Google Scholar (GS) and Web of Science (WoS). Here, we examine to what extent citation data from the two databases reflect the scholarly impact of women and men differently. Our conjecture is that WoS carries an indirect gender bias in its selection criteria for citation sources that GS avoids due to criteria that are more inclusive. Using a sample of 1250 U.S. researchers in Sociology, Political Science, Economics, Cardiology and Chemistry, we examine gender differences in the average citation coverage of the two databases. We also calculate database-specific h-indices for all authors in the sample. In repeated simulations of hiring scenarios, we use these indices to examine whether women's appointment rates increase if hiring decisions rely on data from GS in lieu of WoS. We find no systematic gender differences in the citation coverage of the two databases. Further, our results indicate marginal to non-existing effects of database selection on women's success-rates in the simulations. In line with the existing literature, we find the citation coverage in WoS to be largest in Cardiology and Chemistry and smallest in Political Science and Sociology. The concordance between author-based h-indices measured by GS and WoS is largest for Chemistry followed by Cardiology, Political Science, Sociology and Economics. 相似文献
36.
37.
38.
39.
Within the school of thought known as Critical Thinking, identifying or finding missing assumptions is viewed as one of the principal thinking skills. Within the new subject in schools and colleges, usually called Critical Thinking, the skill of finding missing assumptions is similarly prominent, as it is in that subject's public examinations. In this article we examine how school‐ and college‐focused texts explain and teach ‘this very important skill’. The same texts also deal with the nature of assumptions, validity and the role of stated reasons in arguments, and the way these matters are tackled will also be examined in our inquiry. In addition we explore what respected contributors to the critical thinking movement have had to say about some of these issues. 相似文献
40.