全文获取类型
收费全文 | 127812篇 |
免费 | 1883篇 |
国内免费 | 249篇 |
专业分类
教育 | 88978篇 |
科学研究 | 13654篇 |
各国文化 | 2002篇 |
体育 | 9845篇 |
综合类 | 180篇 |
文化理论 | 1115篇 |
信息传播 | 14170篇 |
出版年
2021年 | 982篇 |
2020年 | 1673篇 |
2019年 | 2626篇 |
2018年 | 3182篇 |
2017年 | 3465篇 |
2016年 | 3486篇 |
2015年 | 2377篇 |
2014年 | 3254篇 |
2013年 | 27775篇 |
2012年 | 2527篇 |
2011年 | 2938篇 |
2010年 | 2479篇 |
2009年 | 2753篇 |
2008年 | 2557篇 |
2007年 | 2273篇 |
2006年 | 2472篇 |
2005年 | 2460篇 |
2004年 | 3136篇 |
2003年 | 2448篇 |
2002年 | 2264篇 |
2001年 | 2158篇 |
2000年 | 1874篇 |
1999年 | 1700篇 |
1998年 | 1505篇 |
1997年 | 1553篇 |
1996年 | 1733篇 |
1995年 | 1498篇 |
1994年 | 1499篇 |
1993年 | 1492篇 |
1992年 | 1577篇 |
1991年 | 1508篇 |
1990年 | 1497篇 |
1989年 | 1440篇 |
1988年 | 1287篇 |
1987年 | 1237篇 |
1986年 | 1240篇 |
1985年 | 1504篇 |
1984年 | 1357篇 |
1983年 | 1348篇 |
1982年 | 1289篇 |
1981年 | 1208篇 |
1980年 | 1191篇 |
1979年 | 1321篇 |
1978年 | 1261篇 |
1977年 | 1150篇 |
1976年 | 1039篇 |
1975年 | 838篇 |
1974年 | 857篇 |
1973年 | 814篇 |
1971年 | 677篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
811.
Elodie A. Roy 《Media History》2018,24(1):26-45
Drawing from visual, material and written archival sources, this article critically explores some of the functions, uses and perceived values of recorded sound during the First World War and in its aftermath. An instrument of communication as well as commemoration, the gramophone helped bridge geographical (and, in some cases, cultural) distances between the home front and the rear, providing civilians with the fleeting illusion of presence, proximity, or even sentimental communion with the front. The article analyses (a) the affective and connective, but also propagandist, values of commercial wartime recordings as they circulated between the home and the front, (b) the popular notion of gramophones as regulatory instruments of civilisation, (c) the commemorative exploitations of recorded sound in the interwar period. The article focuses on the British experience, contrasting it with examples drawn from French and German experiences. 相似文献
812.
Daniel Maier A. Waldherr P. Miltner G. Wiedemann A. Niekler A. Keinert 《Communication methods and measures》2018,12(2-3):93-118
ABSTRACTLatent Dirichlet allocation (LDA) topic models are increasingly being used in communication research. Yet, questions regarding reliability and validity of the approach have received little attention thus far. In applying LDA to textual data, researchers need to tackle at least four major challenges that affect these criteria: (a) appropriate pre-processing of the text collection; (b) adequate selection of model parameters, including the number of topics to be generated; (c) evaluation of the model’s reliability; and (d) the process of validly interpreting the resulting topics. We review the research literature dealing with these questions and propose a methodology that approaches these challenges. Our overall goal is to make LDA topic modeling more accessible to communication researchers and to ensure compliance with disciplinary standards. Consequently, we develop a brief hands-on user guide for applying LDA topic modeling. We demonstrate the value of our approach with empirical data from an ongoing research project. 相似文献
813.
ABSTRACTEmploying a number of different standalone programs is a prevalent approach among communication scholars who use computational methods to analyze media content. For instance, a researcher might use a specific program or a paid service to scrape some content from the Web, then use another program to process the resulting data, and finally conduct statistical analysis or produce some visualizations in yet another program. This makes it hard to build reproducible workflows, and even harder to build on the work of earlier studies. To improve this situation, we propose and discuss four criteria that a framework for automated content analysis should fulfill: scalability, free and open source, adaptability, and accessibility via multiple interfaces. We also describe how to put these considerations into practice, discuss their feasibility, and point toward future developments. 相似文献
814.
Wondwossen M. Beyene 《Journal of Web Librarianship》2018,12(2):121-140
Digital inclusion is a strategy pursued to foster social inclusion of those who have been sidelined from the mainstream of information society due to lack of access to digital technologies and the skills to use them. Libraries have been working to close the gap by providing access to computers, the Internet, digital content, and digital literacy programs. However, research reveals a new type of divide where digitally competent people could be digitally excluded. This shows the need for a better conceptualization of access and literacy. This paper commits to exploring the concept of access to digital content from the perspective of people with print disability. It involved in-depth interviews with ten participants with print disability where the International Classification of Functioning, Disability, and Health was used as a framework for data analysis. The overall analysis shows that digital inclusion would be more meaningful if it involved providing content in alternative formats and empowering users to make informed choices. Issues such as flexibility and adaptability in content presentation and design of content discovery tools are among those discussed. 相似文献
815.
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
816.
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
817.
818.
Andrew S. Pyle 《Communication Teacher》2018,32(4):209-214
Courses: This unit activity is intended for public relations (PR), crisis communication, or journalism courses.
Objectives: The purpose is to equip future PR professionals with critical thinking skills and experience to manage crises. Students demonstrate mastery in two ways: by crafting clear crisis response messages and materials in a narrow time frame, and by applying a crisis communication heuristic to manage a simulated crisis event. 相似文献
819.
Critical communication pedagogy and service learning in a mixed-method communication research course
ABSTRACTCourse: Mixed-Method Communication Research MethodsObjective: The purpose of this semester-long activity is to provide students with opportunities to cultivate mixed-method communication research skills through a social justice-informed service-learning format. Completing this course, students will be able to: recognize the unique strengths of quantitative and qualitative research methods; locate, evaluate, and utilize scholarly literature for a literature review; conduct an original research project using quantitative and qualitative research methods to gather and analyze data; and raise self and community awareness about a social issue through collaboration with a community organization. 相似文献
820.
This study explores science communication on Twitter by investigating a sample of tweets referring to academic papers in five different scientific fields. The specifications of science communicators on Twitter, the characteristics of those who initiate actions (by tweeting), the extent and quality of reactions (retweeting), individual and group interactions, and the distribution of tweets across types of engagement in the process of science communication (i.e., dissemination, consultation, and evaluation) were explored. A broad array of actors is involved in the communication of science on Twitter, with individual citizens and individual researchers playing an important role. In principle, this is promising for creating direct interaction, which can be difficult through more traditional mass media. The vast majority of communication activities regarding academic papers is undigested dissemination with almost no sign of debate, contestation, or collective reflection. Another general finding of this study is that bot accounts play a major role in the science communication landscape on Twitter. 相似文献