全文获取类型
收费全文 | 1688篇 |
免费 | 25篇 |
专业分类
教育 | 1251篇 |
科学研究 | 124篇 |
各国文化 | 20篇 |
体育 | 76篇 |
综合类 | 2篇 |
文化理论 | 24篇 |
信息传播 | 216篇 |
出版年
2021年 | 17篇 |
2020年 | 29篇 |
2019年 | 46篇 |
2018年 | 53篇 |
2017年 | 66篇 |
2016年 | 62篇 |
2015年 | 32篇 |
2014年 | 56篇 |
2013年 | 448篇 |
2012年 | 42篇 |
2011年 | 49篇 |
2010年 | 42篇 |
2009年 | 43篇 |
2008年 | 34篇 |
2007年 | 37篇 |
2006年 | 29篇 |
2005年 | 29篇 |
2004年 | 24篇 |
2003年 | 24篇 |
2002年 | 24篇 |
2001年 | 18篇 |
2000年 | 28篇 |
1999年 | 25篇 |
1998年 | 19篇 |
1997年 | 16篇 |
1996年 | 16篇 |
1995年 | 10篇 |
1994年 | 14篇 |
1993年 | 19篇 |
1992年 | 14篇 |
1991年 | 17篇 |
1990年 | 14篇 |
1989年 | 11篇 |
1988年 | 14篇 |
1987年 | 14篇 |
1986年 | 10篇 |
1985年 | 19篇 |
1983年 | 12篇 |
1982年 | 13篇 |
1981年 | 9篇 |
1980年 | 14篇 |
1979年 | 15篇 |
1978年 | 15篇 |
1977年 | 8篇 |
1975年 | 10篇 |
1973年 | 8篇 |
1972年 | 7篇 |
1968年 | 8篇 |
1940年 | 8篇 |
1933年 | 9篇 |
排序方式: 共有1713条查询结果,搜索用时 15 毫秒
91.
The aim of this study was to determine the level of awareness of methodological search filters among health and academic librarians in the UK and Ireland, their use of filters and views on the perceived benefits, limitations and ways to increase usage of search filters. A random proportional sample of health and academic librarians were surveyed by telephone and fax. Overall, 88% (196/224) completed the telephone survey to establish awareness and use of filters. Eighty-four per cent (51/61) completed a fax survey focusing in more depth on usability issues surrounding filters. Results indicate a high level of awareness of methodological filters, but low level of usage. Furthermore, a high level of awareness did not necessarily correlate with a high level of knowledge or understanding. Examination of responses revealed limitations and recommendations beyond those reported in the literature and highlights the relationship between understanding and effective use of filters. Improved dissemination and publication of filters is required to better inform librarians on the concept of filters and how to use them effectively. 相似文献
92.
In May 2002, the Denison Memorial Library at the University of Colorado Health Sciences Center and the J. Otto Lottes Health Sciences Library at the University of Missouri-Columbia, with funding from the National Network of Libraries of Medicine-Midcontinental Region, embarked on a collaborative, real-time reference project using the 24/7 Reference, Inc., software package. This paper describes how the project was conceived, and includes details on the service hours, staffing, training, marketing, lessons learned, and future plans for the service. 相似文献
93.
Johnson MH 《Child development》2000,71(1):75-81
One future direction for cognitive development research involves a closer integration with our knowledge about the developing brain. I present a framework for analyzing and interpreting postnatal functional brain development in human infants. Three specific hypotheses contribute to this framework, within which a variety of phenomena associated with the neural basis of perception and cognition in normal and abnormal development can be characterized. 相似文献
94.
95.
96.
97.
98.
In 1938 Hadley Cantril was able to study the effect of Orson Welles’ “Invasion from Mars”; program in the period immediately following the broadcast. This broadcast was perhaps the greatest hoax—or deception—of its time. Although not nearly so dramatic in its impact, it cannot be denied that the disclosure of the rigging of quiz shows had its effect upon the American public. 相似文献
99.
100.