全文获取类型
收费全文 | 13129篇 |
免费 | 126篇 |
国内免费 | 11篇 |
专业分类
教育 | 8695篇 |
科学研究 | 2165篇 |
各国文化 | 86篇 |
体育 | 1009篇 |
综合类 | 5篇 |
文化理论 | 120篇 |
信息传播 | 1186篇 |
出版年
2021年 | 137篇 |
2020年 | 200篇 |
2019年 | 345篇 |
2018年 | 452篇 |
2017年 | 401篇 |
2016年 | 353篇 |
2015年 | 221篇 |
2014年 | 304篇 |
2013年 | 2342篇 |
2012年 | 264篇 |
2011年 | 242篇 |
2010年 | 246篇 |
2009年 | 214篇 |
2008年 | 207篇 |
2007年 | 212篇 |
2006年 | 176篇 |
2005年 | 160篇 |
2004年 | 156篇 |
2003年 | 156篇 |
2002年 | 143篇 |
2001年 | 191篇 |
2000年 | 198篇 |
1999年 | 171篇 |
1998年 | 95篇 |
1997年 | 101篇 |
1996年 | 123篇 |
1995年 | 91篇 |
1994年 | 108篇 |
1993年 | 102篇 |
1992年 | 140篇 |
1991年 | 149篇 |
1990年 | 151篇 |
1989年 | 172篇 |
1988年 | 125篇 |
1987年 | 121篇 |
1986年 | 161篇 |
1985年 | 165篇 |
1984年 | 138篇 |
1983年 | 131篇 |
1982年 | 123篇 |
1981年 | 96篇 |
1980年 | 109篇 |
1979年 | 146篇 |
1978年 | 126篇 |
1977年 | 107篇 |
1976年 | 103篇 |
1974年 | 114篇 |
1973年 | 100篇 |
1972年 | 91篇 |
1971年 | 108篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
This study examined two levels of media agenda effects on aggregatepublic opinion from different news sources. The effects wereinvestigated immediately and cumulatively. Content analysisdata from the 2000 U.S. presidential election coverage by fournational news organizations were related to the Gallup pre-electionpoll standings of each candidate. Regression analyses foundthat both the salience of a candidate and the salience of theattributes of a candidate cumulatively, but not immediately,influenced his standing in the polls. An analysis of news sourcessupported the finding that the two levels of agenda-settingeffects seemed mostly cumulative rather than immediate. Newsfrom different sources, however, tended to have effects of differentdegrees and sometimes different directions on candidate pollstandings. Cumulative effects of candidate salience on aggregateopinion change were found for non-partisan and neutral newssourcesreporters, poll reporting and public documentswhereasthe effects of candidate attribute salience mostly came frompartisan sourcesthe candidate himself and members ofthe competing political party. Possible political implicationsof these findings are discussed. 相似文献
32.
Steve H. Ching 《The Journal of Academic Librarianship》2018,44(2):196-206
The digital shift has provided easy access to academic library users, and yet, the usage of archival collections continues to be low. At the same time, the need for innovation in library services for cultural heritage scholarship and its advancement is emerging. This paper outlines a library-led service-learning program that connects students with lighthouse artifacts, archival collections, scholars in global academia, and wider communities. Student engagement cases are provided to illustrate the way in which the librarian utilizes the Framework of Information Literacy for Higher Education by ACRL to work closely with students. These cases also demonstrate how students can contribute to knowledge creation and preservation efforts for a specific cultural heritage topic that is not static, but which keeps receiving new contributions or additions to the depository. Thus, this paper is an answer to the ACRL's call for pilot projects to be assessed and shared with the wider community of academic librarians and support staff. It also builds on emerging roles for academic libraries like engaged learning. Librarians must move beyond simply seeing themselves as partners. Instead, librarians should see themselves as prime facilitators that co-create and co-develop cultural heritage research and historical projects by connecting actors and resources more effectively than any single actor can do alone. 相似文献
33.
Lotta Haglund Annikki Roos Petra Wallgren‐Björk 《Health information and libraries journal》2018,35(3):251-255
Librarians in Sweden are facing huge challenges in meeting the demands of their organisations and users. This article looks at four key areas: coping with open science/open access initiatives; increasing demands from researchers for support doing systematic reviews; understanding user experiences in Swedish health science libraries; and the consequences of expanding roles for recruitment and continuing professional development. With regard to changing roles, there is an increasing shift from the generalist towards the expert role. The authors raise the issue as to how to prepare those new to the profession to the changing environment of health science libraries. 相似文献
34.
Around 1960, the politics of the emerging media society in Sweden tended to fixate the formative functions of mass communication. The monopoly of public service broadcast media, press subsidies and new tendencies in film policy were some of the issues around which uncertainty prevailed. New methods to provide reliable data were sought by politicians, since empirical facts were required as arguments for an updated media policy. This article examines the different ways that the field of media studies was introduced in Sweden between 1960 and 1980. We argue that Swedish academic media studies departed from, and emerged within, a rather diffuse borderland between industry, politics and academia. The formation of national media research in Sweden can partly be seen as an effect of politicians and the media industry wanting to be better informed on issues such as media influence, media ownership and the habits and composition of the media audience. 相似文献
35.
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
36.
37.
38.
39.
40.