全文获取类型
收费全文 | 37528篇 |
免费 | 430篇 |
国内免费 | 15篇 |
专业分类
教育 | 27333篇 |
科学研究 | 3476篇 |
各国文化 | 271篇 |
体育 | 2498篇 |
综合类 | 13篇 |
文化理论 | 598篇 |
信息传播 | 3784篇 |
出版年
2022年 | 198篇 |
2021年 | 291篇 |
2020年 | 450篇 |
2019年 | 713篇 |
2018年 | 2985篇 |
2017年 | 2897篇 |
2016年 | 2321篇 |
2015年 | 613篇 |
2014年 | 868篇 |
2013年 | 5276篇 |
2012年 | 943篇 |
2011年 | 1442篇 |
2010年 | 1374篇 |
2009年 | 966篇 |
2008年 | 1240篇 |
2007年 | 1686篇 |
2006年 | 559篇 |
2005年 | 858篇 |
2004年 | 880篇 |
2003年 | 770篇 |
2002年 | 528篇 |
2001年 | 524篇 |
2000年 | 466篇 |
1999年 | 401篇 |
1998年 | 253篇 |
1997年 | 261篇 |
1996年 | 277篇 |
1995年 | 266篇 |
1994年 | 213篇 |
1993年 | 235篇 |
1992年 | 345篇 |
1991年 | 341篇 |
1990年 | 335篇 |
1989年 | 329篇 |
1988年 | 296篇 |
1987年 | 342篇 |
1986年 | 296篇 |
1985年 | 332篇 |
1984年 | 282篇 |
1983年 | 249篇 |
1982年 | 218篇 |
1981年 | 184篇 |
1980年 | 178篇 |
1979年 | 296篇 |
1978年 | 212篇 |
1977年 | 194篇 |
1976年 | 180篇 |
1975年 | 158篇 |
1974年 | 167篇 |
1971年 | 155篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
Christina Heady Megan M. Morrison Joshua Vossler 《The Journal of Academic Librarianship》2018,44(5):642-649
The purpose of this ecological study was to examine the impact of a library credit course on graduation rates and GPA using pre-existing records. Over 20?years of aggregate institutional data were analyzed to evaluate the course's impact on first-time-full-time, white, and black students. Results were mixed: students who took the course were less likely to graduate than their peers who did not take the course but enjoyed slightly higher GPAs at graduation. It was discovered that students taking the course are not representative of the overall student body and struggle academically. Implications for revisions to the library credit course are discussed. 相似文献
152.
153.
154.
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accumulated history with Information and Communication Technologies (ICTs) as a replacement for the contested and outdated term ‘digital divide.’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
155.
156.
Yu. N. Schuko 《Scientific and Technical Information Processing》2018,45(3):163-167
Although the USSR and the United States had a comparable number of employees in the field of scientific information, there was a substantial difference in funding, which resulted in a lack of information support for Soviet scientists. While 90% of the publications in the United States were available almost immediately after their release, in the USSR they were delayed by 1.5 to 2 years. Since the publication of the Abstracts Journal by VINITI (AJ), its content was consistently expanding and reached its peak in 1990 (1.5 million documents per year). The next quarter of a century was characterized by a decline in both the composition of the AJ and the time required for its document coverage. The steps for restructuring VINITI activities are discussed. The focus is made on improving the limited coverage of the Russian-language part of the global flow of scientific information by Western information systems. 相似文献
157.
P. A. Kalachikhin 《Scientific and Technical Information Processing》2018,45(1):28-34
The issues related to funding of public research organizations are explored. The history of scientometric information systems is outlined. The advantages and disadvantages of a bibliometric approach to financing of research organizations are analyzed. The link between the assessment of the scientific and technological potential of an institution and the optimal allocation of funds is investigated. Recommendations on how to improve the efficiency of public resources allocated for scientific research are presented. 相似文献
158.
I. I. Potapov 《Scientific and Technical Information Processing》2018,45(2):63-69
Modern global eco-dynamics problems are discussed. It is noted that global changes are mostly characterized by several key features, such as their multicomponent nature, as well as interactivity and nonlinearity. These features challenge various forecast estimates in such a way that the concept of forecasting has been replaced over the last few years by a much more ambiguous concept of scenarios. The vagueness of scenarios is due to the problem of global climate change. A global climate–nature–society system model is outlined. 相似文献
159.
I. V. Zibareva L. Yu. Ilina B. L. Alperin 《Scientific and Technical Information Processing》2018,45(2):106-109
The current state of the Russian Science Citation Index is analyzed. Several areas for its further development identified by long-standing active users, such as data searching, refinement, and storage; current user alerts; data input with the Science Index license; patent information; and the application programming interface (API) are investigated. 相似文献
160.
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