全文获取类型
收费全文 | 13827篇 |
免费 | 211篇 |
国内免费 | 153篇 |
专业分类
教育 | 9753篇 |
科学研究 | 1295篇 |
各国文化 | 147篇 |
体育 | 1080篇 |
综合类 | 279篇 |
文化理论 | 137篇 |
信息传播 | 1500篇 |
出版年
2023年 | 35篇 |
2022年 | 119篇 |
2021年 | 265篇 |
2020年 | 344篇 |
2019年 | 379篇 |
2018年 | 408篇 |
2017年 | 487篇 |
2016年 | 429篇 |
2015年 | 429篇 |
2014年 | 567篇 |
2013年 | 2430篇 |
2012年 | 689篇 |
2011年 | 671篇 |
2010年 | 620篇 |
2009年 | 567篇 |
2008年 | 638篇 |
2007年 | 560篇 |
2006年 | 491篇 |
2005年 | 456篇 |
2004年 | 343篇 |
2003年 | 281篇 |
2002年 | 278篇 |
2001年 | 206篇 |
2000年 | 184篇 |
1999年 | 130篇 |
1998年 | 115篇 |
1997年 | 141篇 |
1996年 | 146篇 |
1995年 | 114篇 |
1994年 | 123篇 |
1993年 | 103篇 |
1992年 | 106篇 |
1991年 | 87篇 |
1990年 | 94篇 |
1989年 | 65篇 |
1988年 | 71篇 |
1987年 | 53篇 |
1986年 | 79篇 |
1985年 | 79篇 |
1984年 | 80篇 |
1983年 | 78篇 |
1982年 | 64篇 |
1981年 | 53篇 |
1980年 | 56篇 |
1979年 | 53篇 |
1978年 | 58篇 |
1977年 | 50篇 |
1976年 | 41篇 |
1975年 | 35篇 |
1974年 | 29篇 |
排序方式: 共有10000条查询结果,搜索用时 126 毫秒
71.
In this essay, we respond to the narratives and essays in this issue by examining organizational power issues related to researchers and institutional research boards (IRBs). Rather than taking a singular perspective on power, we use multiple perspectives and suggest that the cumulative analyses provide the best understanding of IRBs and organizational power. 相似文献
72.
73.
Inverted Index Compression Using Word-Aligned Binary Codes 总被引:3,自引:1,他引:3
We examine index representation techniques for document-based inverted files, and present a mechanism for compressing them using word-aligned binary codes. The new approach allows extremely fast decoding of inverted lists during query processing, while providing compression rates better than other high-throughput representations. Results are given for several large text collections in support of these claims, both for compression effectiveness and query efficiency. 相似文献
74.
75.
Brian Jackson 《The Journal of Academic Librarianship》2018,44(5):603-612
Academic libraries have to a large extent taken the lead in facilitating new approaches to research data management, but changes to the research data landscape have had an impact on numerous areas of academic work, including ethics review. Using interpretive phenomenological analysis of interviews with chairs of Canadian research ethics boards, this study explores how ethics review boards have experienced changes to data policy and related technologies in order to describe the ethical implications of new approaches to data management and to explore ways in which the library, ethics review boards, and other campus partners might harmonize efforts to support emerging data practices. While ethics review boards in Canada are keenly aware of open data policies, data publishing in practice is still nascent. There is uncertainty about the adoption of changing technologies for research and their impacts on privacy protection. Where responsibility lies for addressing these uncertainties is often unclear. Academic libraries and research ethics boards are well-suited to engage in mutual knowledge transfer and to integrate data management planning and ethics review processes. Institutional-level oversight that includes all campus departments impacted by changes to the research data landscape may facilitate improved communication and reduce role ambiguity. 相似文献
76.
Michael M. Widdersheim 《Library & information science research》2018,40(2):144-152
History and case study are two diachronic research strategies commonly used to study political discourse as it relates to public libraries. Though suitable for some studies, these strategies are inexhaustive. A new, blended research strategy is therefore needed to accomplish what history and case study alone cannot. This hybrid strategy, historical case study, must analyze cases from the distant past to the present, using eclectic data sources, in order to produce both idiographic and nomothetic knowledge. To develop historical case study, the universal components of diachronic analysis are first identified. A general research design for historical case study is then introduced. Finally, historical case study is tested in an actual research project. Findings from this project reveal that historical case study is a successful diachronic research strategy. Historical case study is a new and valuable research design suitable for addressing questions related to change, continuity, development, and evolution. 相似文献
77.
John A. Velez David R. Ewoldsen Michael D. Hanus Hyunjin Song Jonathan A. Villarreal 《Communication Research Reports》2018,35(5):424-433
This study examines how social comparison information provided by video game leaderboards may influence players’ retrospective judgments of autonomy, competence, and relatedness need fulfillment. Participants played a video game and were randomly assigned to receive no postgame feedback or were shown a leaderboard that placed them in the top or bottom quartile of players. Results indicate downward social comparisons increase enjoyment by increasing competence and relatedness perceptions. However, upward comparisons did not have an opposite effect, nor did either type of social comparison influence players’ autonomy perceptions. Implications for applying Self-Determination Theory to video game enjoyment in the context of social comparison feedback is discussed. 相似文献
78.
This paper examines the persistence of Americans’ misunderstanding of the function of privacy policies. We also identify groups that have misplaced confidence in the privacy policy label and address whether the groups’ patterns of misperception have changed over time. The findings add a new dimension to the argument that the usefulness of privacy policies needs to be reassessed. As a remedy, we call for media literacy programs to address structural features of media systems that lead to broadly held misperceptions such as the one examined here. 相似文献
79.
Elena Rudkowsky Martin Haselmayer Matthias Wastian Marcelo Jenny Štefan Emrich Michael Sedlmair 《Communication methods and measures》2018,12(2-3):140-157
ABSTRACTMoving beyond the dominant bag-of-words approach to sentiment analysis we introduce an alternative procedure based on distributed word embeddings. The strength of word embeddings is the ability to capture similarities in word meaning. We use word embeddings as part of a supervised machine learning procedure which estimates levels of negativity in parliamentary speeches. The procedure’s accuracy is evaluated with crowdcoded training sentences; its external validity through a study of patterns of negativity in Austrian parliamentary speeches. The results show the potential of the word embeddings approach for sentiment analysis in the social sciences. 相似文献
80.