全文获取类型
收费全文 | 24188篇 |
免费 | 426篇 |
国内免费 | 15篇 |
专业分类
教育 | 17272篇 |
科学研究 | 2140篇 |
各国文化 | 227篇 |
体育 | 2035篇 |
综合类 | 13篇 |
文化理论 | 182篇 |
信息传播 | 2760篇 |
出版年
2022年 | 181篇 |
2021年 | 271篇 |
2020年 | 410篇 |
2019年 | 658篇 |
2018年 | 893篇 |
2017年 | 862篇 |
2016年 | 740篇 |
2015年 | 451篇 |
2014年 | 698篇 |
2013年 | 4713篇 |
2012年 | 665篇 |
2011年 | 670篇 |
2010年 | 488篇 |
2009年 | 511篇 |
2008年 | 565篇 |
2007年 | 497篇 |
2006年 | 458篇 |
2005年 | 426篇 |
2004年 | 394篇 |
2003年 | 377篇 |
2002年 | 358篇 |
2001年 | 497篇 |
2000年 | 424篇 |
1999年 | 376篇 |
1998年 | 213篇 |
1997年 | 225篇 |
1996年 | 247篇 |
1995年 | 240篇 |
1994年 | 197篇 |
1993年 | 212篇 |
1992年 | 333篇 |
1991年 | 311篇 |
1990年 | 306篇 |
1989年 | 312篇 |
1988年 | 267篇 |
1987年 | 310篇 |
1986年 | 275篇 |
1985年 | 315篇 |
1984年 | 261篇 |
1983年 | 222篇 |
1982年 | 196篇 |
1981年 | 173篇 |
1980年 | 160篇 |
1979年 | 271篇 |
1978年 | 188篇 |
1977年 | 173篇 |
1976年 | 155篇 |
1975年 | 143篇 |
1974年 | 154篇 |
1971年 | 148篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
122.
This paper identifies individuals’ accumulated history with Information and Communication Technologies (ICTs) as a replacement for the contested and outdated term ‘digital divide.’ We propose that an individual’s ability to benefit from their technological history consists of four factors: awareness, knowledge, access, and technological capacity of the user’s social collective. Together, these factors make up the individual’s level or amount of Technological Capital. The development of this construct was based on empirical research conducted in Soweto, South Africa, and through an analysis of the literature on assessing individuals’ accumulated histories. The concept of technological capital has the potential for application in fields in which ICTs are used for communication, capacity building, and identifying barriers to adoption of new technologies. The use of the concept may have implications for policy decisions, resource allocation, and future research into differences among individuals’ and communities’ ability to benefit from the introduction of new technologies. 相似文献
123.
124.
Jennifer L. Jones 《图书馆管理杂志》2018,58(1):54-64
As academic libraries' budgets remain flat while their expenditures rise, library leaders must seek out alternative sources of funding. One option is a mandatory student fee dedicated to the library. This article presents the results of a survey of 152 deans and directors of public R1 and R2 research universities that were asked whether their libraries benefit from mandatory student fees. While a library-specific fee is unusual, nearly half of responding libraries are eligible to receive some portion of another mandatory student fee. Study results can serve as evidence for libraries preparing to make a case for the significant, positive impact possible through even a modest library fee. 相似文献
125.
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
126.
Elizabeth Behm-Morawitz Brandon M. Miller Jennifer Lewallen 《Communication Research Reports》2018,35(3):210-221
Content analyses of prime-time television provide a picture of predominant cultural stereotypes and social trends. The present research is a quantitative content analysis of social class in popular broadcast and cable television in the United States. This research advances scholarship by systematically analyzing character class in addition to more commonly examined variables such as race and gender. A model for the operationalization of class for quantitative content analyses of mediated texts is offered. This proof of concept study demonstrates the viability of studying media representations of class quantitatively to systematically document patterns of portrayal. 相似文献
127.
Bringing the Law to the Library: The Importance of Librarian Mediation in Access to Justice Services
Yolanda Patrice Jones 《Legal Reference Services Quarterly》2018,37(1):11-37
Library access to justice programs and services help people who need legal information and who cannot afford an attorney. Librarian mediation is a critical component in the provision of access to justice services. However, the value of library mediation, or assistance with using library resources, is often unrecognized, particularly where members of the public are trying to access electronic legal information sources, online legal forms, and other law technologies. This article will explore the role of librarians in providing access to justice services from the perspective of the work of Richard Susskind, which emphasizes technological approaches to providing legal services. While there is a place for technology in access to justice services, there is also a valuable role that librarians play in contributing to access to justice. 相似文献
128.
Tamara M. Nelson 《Medical reference services quarterly》2018,37(3):312-318
This column describes the development and implementation of a responsive library course designed to train third-year medical students as they begin their clerkships. The course design consisted of a brief face-to-face introduction during third-year orientation and an online course developed in Canvas, an online learning management system. The objective of the course was to not only introduce students to the resources but also to teach them how to effectively use those resources at the point-of-care. Students evaluated the course to assess the overall effectiveness of the instruction. Course development and content, feedback provided by students, as well as suggestions for improvement are discussed. 相似文献
129.
Debasis?GangulyEmail authorView authors OrcID profile Gareth?J.?F.?Jones Aarón?Ramírez-de-la-Cruz Gabriela?Ramírez-de-la-Rosa Esaú?Villatoro-Tello 《Information Retrieval》2018,21(1):1-23
Automatic detection of source code plagiarism is an important research field for both the commercial software industry and within the research community. Existing methods of plagiarism detection primarily involve exhaustive pairwise document comparison, which does not scale well for large software collections. To achieve scalability, we approach the problem from an information retrieval (IR) perspective. We retrieve a ranked list of candidate documents in response to a pseudo-query representation constructed from each source code document in the collection. The challenge in source code document retrieval is that the standard bag-of-words (BoW) representation model for such documents is likely to result in many false positives being retrieved, because of the use of identical programming language specific constructs and keywords. To address this problem, we make use of an abstract syntax tree (AST) representation of the source code documents. While the IR approach is efficient, it is essentially unsupervised in nature. To further improve its effectiveness, we apply a supervised classifier (pre-trained with features extracted from sample plagiarized source code pairs) on the top ranked retrieved documents. We report experiments on the SOCO-2014 dataset comprising 12K Java source files with almost 1M lines of code. Our experiments confirm that the AST based approach produces significantly better retrieval effectiveness than a standard BoW representation, i.e., the AST based approach is able to identify a higher number of plagiarized source code documents at top ranks in response to a query source code document. The supervised classifier, trained on features extracted from sample plagiarized source code pairs, is shown to effectively filter and thus further improve the ranked list of retrieved candidate plagiarized documents. 相似文献
130.
Silas M. Oliveira 《New Review of Academic Librarianship》2018,24(1):35-47
Academic libraries have always strived to be purposively involved in the university's mission attainment efforts. Today, the increase of retention levels is paramount, and, in many cases, it is at the center of higher education institution's strategic plans. For Andrews University, for example, the goal is to reach 80% in the next five years. In the United States, student retention efforts become even more critical due, in part, to declining enrollment numbers set off by soaring higher education costs. Academic librarians are aware of the library's role in the university's overall efforts to increase persistence rates and curtail attrition. Through a literature review, this article highlights how academic libraries are participating in this process. This study focuses on how academic libraries can be leaders in their Institutions by adopting a user-centered philosophy and services that will promote life-long learning, enhance students’ academic experience, and promote engagement, leading to retention. 相似文献