全文获取类型
收费全文 | 30912篇 |
免费 | 482篇 |
国内免费 | 22篇 |
专业分类
教育 | 22294篇 |
科学研究 | 2707篇 |
各国文化 | 361篇 |
体育 | 2371篇 |
综合类 | 18篇 |
文化理论 | 277篇 |
信息传播 | 3388篇 |
出版年
2022年 | 211篇 |
2021年 | 308篇 |
2020年 | 459篇 |
2019年 | 739篇 |
2018年 | 1018篇 |
2017年 | 1025篇 |
2016年 | 907篇 |
2015年 | 582篇 |
2014年 | 853篇 |
2013年 | 6290篇 |
2012年 | 791篇 |
2011年 | 815篇 |
2010年 | 636篇 |
2009年 | 631篇 |
2008年 | 717篇 |
2007年 | 666篇 |
2006年 | 596篇 |
2005年 | 579篇 |
2004年 | 528篇 |
2003年 | 496篇 |
2002年 | 480篇 |
2001年 | 593篇 |
2000年 | 511篇 |
1999年 | 487篇 |
1998年 | 310篇 |
1997年 | 318篇 |
1996年 | 352篇 |
1995年 | 369篇 |
1994年 | 296篇 |
1993年 | 299篇 |
1992年 | 424篇 |
1991年 | 394篇 |
1990年 | 390篇 |
1989年 | 395篇 |
1988年 | 345篇 |
1987年 | 395篇 |
1986年 | 347篇 |
1985年 | 401篇 |
1984年 | 344篇 |
1983年 | 299篇 |
1982年 | 293篇 |
1981年 | 239篇 |
1980年 | 202篇 |
1979年 | 323篇 |
1978年 | 249篇 |
1977年 | 243篇 |
1976年 | 216篇 |
1975年 | 195篇 |
1974年 | 203篇 |
1973年 | 183篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Wendy M. Yen 《Educational Measurement》1997,16(3):5-15
How accurate is the reported percent of students’reaching standards at the school level? How are standard errors for these statistics computed? How do estimates vary with choice of generalizability model? 相似文献
32.
John R. Garrett 《Publishing Research Quarterly》1991,7(4):13-20
This article focuses on several conceptual and structural issues that are central to copyright compliance in the electronic
age. It presumes the development of a national electronic network for storing, organizing, accessing, managing, and charging
for information. The article first discusses the implications of constructing a comprehensive electronic “highway,” or Digital
Library System (DLS), which would link information to the widespread community of users. It then presents the ramifications
of a highly decentralized set of subsystems serving rights holders and users, linked by protocols established by the DLS.
A discussion of the implications of digital interchangeability for copyright follows. The article ends with an analysis of
alternatives to existing intellectual property rights conveyance systems, and concludes that current ownership structures,
and systems for conveying rights and royalties, will remain the foundation for copyright in the electronic world.
This article appeared in a slightly different form in theProceedings of the Twelfth National Online Meeting—1991, and is published here with the permission of Learned Information, Inc., Medford, N.J. 相似文献
33.
John M. Budd 《Publishing Research Quarterly》1991,7(2):27-37
In recent years university presses have undergone some significant changes, such as expansion of their scope to include materials
that may have appeal beyond the scholarly market. This article investigates, through the use of a survey of university libraries,
the acquisition of university press products by libraries. In general, recent years have been changes in the relationship
between university presses and libraries that have resulted in fewer items being purchased by the libraries. 相似文献
34.
35.
36.
37.
38.
John Pratt 《Higher Education Quarterly》1993,47(2):142-162
In 1993, the Government of Austria passed legislation establishing a 'binary policy' in higher education. A new accrediting body the Fachhochschulrat was created, empowered to accredit vocationally oriented courses in any institution seeking to offer them. Institutions meeting certain conditions will be entitled to seek designation as Fachhochschulen. The policy marks an important departure from the traditionally highly regulated and centralized system of policymaking in Austria. The article offers an analysis of the factors leading to the policy and analyses the implications for the future. It draws on the author's experience as a member of a team of examiners from the Organization for Economic Co-operation and Development (OECD) undertaking a policy review of Austrian higher education, and points to lessons for Austria from the United Kingdom's experience over the last 25 years. 相似文献
39.
This article discusses the changing relationships of authors and publishers, the current trends and challenges they face, and the direction of these relationships in the future. As the STM publishing industry finds itself in the midst of significant technological and economic changes, this article provides background to these changes and looks at the key elements, including open access business development, institutional repository trends, and emerging public financing policies in the future. 相似文献
40.