首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   5412篇
  免费   116篇
  国内免费   338篇
教育   2474篇
科学研究   1749篇
各国文化   5篇
体育   121篇
综合类   87篇
文化理论   17篇
信息传播   1413篇
  2024年   5篇
  2023年   39篇
  2022年   95篇
  2021年   173篇
  2020年   227篇
  2019年   218篇
  2018年   199篇
  2017年   195篇
  2016年   110篇
  2015年   173篇
  2014年   338篇
  2013年   561篇
  2012年   340篇
  2011年   373篇
  2010年   276篇
  2009年   397篇
  2008年   392篇
  2007年   375篇
  2006年   293篇
  2005年   269篇
  2004年   209篇
  2003年   150篇
  2002年   136篇
  2001年   101篇
  2000年   47篇
  1999年   36篇
  1998年   31篇
  1997年   27篇
  1996年   22篇
  1995年   7篇
  1994年   13篇
  1993年   10篇
  1992年   11篇
  1990年   4篇
  1989年   2篇
  1988年   1篇
  1987年   1篇
  1986年   2篇
  1985年   4篇
  1984年   1篇
  1982年   1篇
  1978年   1篇
  1957年   1篇
排序方式: 共有5866条查询结果,搜索用时 15 毫秒
991.
New York University's (NYU) Data Service Studio has recently launched the NYU Survey Service, whose ultimate aim is to support the development and administration of surveys of all types. For the Web-based component, the service utilizes a product called Qualtrics, which allows university affiliates to develop and administer Web-based surveys. This article describes the process by which NYU came to offer the service during a time when concerns abound about the ability of libraries to support and expand offerings while still meeting institutional imperatives such as robust data services. While many considerations went into the evaluation and ultimate conclusion to pilot the service, this article considers those most related to library collaborations, undergraduate instruction, data and information literacy, learning and research, and application administration and support.  相似文献   
992.
Abstract

The paper analyses the trends of information delivery at the Knust library. It reviews the history of cooperation, conventional practices in information delivery, and current trends in Ghana. CD-ROM and online facilities, which are the two main tools for electronic information delivery, are highlighted.

The paper reveals that there is a general acceptance among members of the academic community that electronic information delivery services have had considerable impact on their work. The paper looks into the future of document delivery and proposed possible ways of enhancing and sustaining the existing facilities.  相似文献   
993.
This paper demonstrates the divergent requestor privacy policies of professional librarians and the administration of the Freedom of Information Act (FOIA), and urges the federal government to adhere to librarian ethics in order to protect FOIA requestors. Section 1 of the paper provides information about the origins and purpose of the FOIA. Section 2 offers an overview of the philosophical and historical origins of library patron privacy ethics, discussing both the ethical basis for patron privacy and actual instances where library records have been sought for government surveillance of private citizens. Section 3 describes the state library laws that protect library requestors, as well as federal laws that protect non-FOIA requestor privacy rights, including the Video Privacy Protection Act (VPPA), which protects video rental records. Section 4 of the paper warns that, in the digital era, it is more important than ever to safeguard personal information like that contained in FOIA requests to prevent the stifling of information seeking activities in the United States. By modifying laws tomeet the needs of the “information age,” the United States government can embrace and utilize the ethical standards that are at the foundation of librarianship, and protect the principle that information should be free and available to the American populace.  相似文献   
994.
This article presents the results of a comparative study of Web of Science (WoS), Scopus, and Google Scholar (GS) for a set of 15 business and economics journals. Citations from the three sources were analyzed to determine whether one source is better than another, or whether a new database such as Scopus, or a free database such as GS could replace WoS. The authors concluded that scholars might want to use alternative tools collectively to get a more complete picture of the scholarly impact of an article.  相似文献   
995.
This study analyzes the coverage of black studies journals as compared to women's studies journals in Web of Science, Academic Search Complete, and ArticleFirst. This study also examines black studies bibliographies and directories to identify journals that are suitable for inclusion in Journal Citation Reports and consequently Web of Science and evaluates seven black studies journals using the Thomson Reuters journal selection process.  相似文献   
996.
In communication science, the distinction between applied and basic research is often accompanied by a discussion of the relative value of each. However, the idea that there is a value distinction to be made between applied and basic research is fundamentally inconsistent with scientific epistemology. Rather than different modes of inquiry with different relative value, communication science is a whole, constituted by applied and basic researchers who focus on different goals of science: to explain, to predict, and to control. An example is provided of a highly successful communication intervention created via the cooperation between applied and basic scholars.  相似文献   
997.
Scopus and Web of Science are the two major citation databases that collect and disseminate bibliometric statistics about research articles, journals, institutions, and individual authors. Liaison librarians are now regularly called upon to utilize these databases to assist faculty in finding citation activity on their published works for tenure and promotion, grant applications, and more. But questions about the accuracy, scope, and coverage of these tools deserve closer scrutiny. Discrepancies in citation capture led to a systematic study on how Scopus and Web of Science compared in a real-life situation encountered by liaisons: comparing three different disciplines at a medical school and nursing program. How many articles would each database retrieve for each faculty member using the author-searching tools provided? How many cited references for each faculty member would each tool generate? Results demonstrated troubling differences in publication and citation activity capture between Scopus and Web of Science. Implications for librarians are discussed.  相似文献   
998.
黄志红 《编辑学报》2013,25(6):598-600
以新创办期刊《有色金属科学与工程》为例,阐述其为打造成精品专业期刊的办刊思路与具体举措:依托区域和学科优势,积极为行业服务;紧跟形势,学习先进办刊经验,大力推进期刊数字化;开拓创新,广开渠道,利用各种形式组稿。对刊物今后发展作了展望。  相似文献   
999.
面向LOD的关联发现过程的定位、目标与复杂性分析   总被引:1,自引:1,他引:0  
本文以关联数据应用过程中的关联发现过程为研究对象,分析了面向关联开放数据(LOD)的关联发现过程的定位、目标与复杂性。本文认为,关联发现过程处于关联数据应用过程三阶段(数据发布、数据互联与数据消费)中的第二阶段。关联发现过程的整体目标是构建多类资源之间的关联数据网络,该过程的本质就是关联数据网络不断演变的过程。关联发现的过程具有多任务、多路径、多步骤等复杂性特征。目前流行的关联发现框架还存在缺乏对整个网络演变过程的支持、任务类型单一、缺乏流水线机制等不足。因此,关联发现技术的研究急需新的面向整个关联数据网络的、支持完整演变过程的、支持多任务集成的理论、方法与框架。图5。表1。参考文献17。  相似文献   
1000.
The purpose of this research was to build and test a conceptual model of the complex interrelationships between students' learning in science (learning approaches and self-regulation), their reading comprehension, question-asking in class and science achievement. These variables were measured by means of a test and a series of questionnaires administered to 604 ninth-grade students, and the data collected were analysed using a correlational, cross-sectional design. Results of a path analysis indicated that (a) students’ self-regulated and intentional knowledge-constructing activity (self-regulated strategy use, deep approach and knowledge-building) were what chiefly accounted for their question-asking in class; (b) question-asking (high and low levels) was related directly to reading comprehension and indirectly, through its contribution to the this, to academic achievement; (c) reading comprehension was directly and negatively associated with surface approach and indirectly and positively related to deep approach and knowledge-building; and (d) some of these variables, particularly reading comprehension, accounted for academic achievement in science. This model explained nearly 30% of the variance in academic achievement and provided a substantial and distinctive insight into the web of interrelationships among these variables. Implications for future research and science teaching and learning are discussed (e.g. the importance of supporting students' efforts to learn science in a meaningful, active and self-regulated way and of improving their reading comprehension).  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号