全文获取类型
收费全文 | 19638篇 |
免费 | 176篇 |
国内免费 | 14篇 |
专业分类
教育 | 13329篇 |
科学研究 | 2560篇 |
各国文化 | 169篇 |
体育 | 1305篇 |
综合类 | 5篇 |
文化理论 | 220篇 |
信息传播 | 2240篇 |
出版年
2021年 | 116篇 |
2020年 | 198篇 |
2019年 | 307篇 |
2018年 | 993篇 |
2017年 | 1059篇 |
2016年 | 815篇 |
2015年 | 281篇 |
2014年 | 346篇 |
2013年 | 3057篇 |
2012年 | 379篇 |
2011年 | 593篇 |
2010年 | 531篇 |
2009年 | 414篇 |
2008年 | 516篇 |
2007年 | 603篇 |
2006年 | 280篇 |
2005年 | 317篇 |
2004年 | 347篇 |
2003年 | 285篇 |
2002年 | 224篇 |
2001年 | 236篇 |
2000年 | 295篇 |
1999年 | 244篇 |
1998年 | 139篇 |
1997年 | 142篇 |
1996年 | 155篇 |
1995年 | 136篇 |
1994年 | 156篇 |
1993年 | 159篇 |
1992年 | 244篇 |
1991年 | 235篇 |
1990年 | 226篇 |
1989年 | 259篇 |
1988年 | 196篇 |
1987年 | 207篇 |
1986年 | 216篇 |
1985年 | 246篇 |
1984年 | 222篇 |
1983年 | 215篇 |
1982年 | 190篇 |
1981年 | 176篇 |
1980年 | 166篇 |
1979年 | 212篇 |
1978年 | 222篇 |
1977年 | 162篇 |
1976年 | 165篇 |
1975年 | 129篇 |
1974年 | 127篇 |
1973年 | 141篇 |
1972年 | 112篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
Fee WW 《Harvard library bulletin》1975,23(3):271-288
92.
93.
A brief commentary from the Museum Association of New York (MANY) on the unprecedented gap posed by baby-boomer retirement. Based, in part, on MANY's white paper, “Who's Next? Questioning the Future of Museum Leadership in New York State,” this essay deals with questions of succession, leadership and general differences in New York's museum community. 相似文献
94.
Donsbach Wolfgang; Noelle-Neumann Elisabeth; Traugott Michael W.; Worcester Robert 《Int. Journal of Public Opinion Research》2006,18(3):273-274
This issue of the Journal contains three interesting articlesabout central aspects of public opinion research, as well asan equal number of research notes that reflect the range oftopics that interest all public opinion researchers. Toshio Takeshita takes a turn at reconceptualizing agenda-settingstudies, using a taxonomy 相似文献
95.
Chinese Studies Librarianship in North America 总被引:1,自引:0,他引:1
KarenT.Wei 《图书情报工作》2004,48(12):31-34
Although American libraries had begun collecting Chinese language materials in the 19th century, notably the United States Library of Congress in 1869, Yale in 1878, Harvard in 1879, and Berkeley in 1896, East Asian studies librarianship in North America, including China studies librarianship, was not fully developed until the 1960s. There was no formal organization that represented the interest of Chinese studies librarians because there were few of them and most of them were China scholars rather than trained librarians. More than 100 years later, the number of Chinese studies librarians in North America has increased considerably, primarily in response to the demand in the field of China studies and more recently to the needs of immigrant population and the general public who has an interest in China.This paper traces the history and growth of Chinese studies librarianship in North America, documents the development of the professional organization that represents Chinese studies librarians, and exami. 相似文献
96.
97.
Grace Y T Cheng 《Journal of the Medical Library Association》2004,92(4):445-458
OBJECTIVE: This article presents the results of complementary research studies on the behaviors of hospital clinicians in asking clinical questions and the relationship between asking of questions, outcome of information searches, and success in problem solving. METHODS: Triangulation in research methods--a combination of mailed questionnaires, interviews, and a randomized controlled study--was employed to provide complementary views of the research problems under study. RESULTS: The survey and interviews found that clinical problems (concerned mainly with therapy and equipment or technology) were expressed as statements rather than questions (average number of concepts = 1.7), that only slightly more than half (higher for doctors) of problems could be solved, and that the majority of clinical questions were not well formed. An educational workshop however improved clinicians' formulation of questions, but the use of structured prompting was found to improve building of hypotheses in the doctors' group without training. The workshop also improved satisfaction with the obtained information and success in problem solving. Nonetheless, for both the experimental and control groups, more structured and complete questions or statements did not mean higher success rates in problem solving or higher satisfaction with obtained information. CONCLUSION: The triangulation methods have gathered complementary evidence to reject the hypothesis that building well-structured clinical questions would mean higher satisfaction with obtained information and higher success in problem solving. 相似文献
98.
In this essay, we respond to the narratives and essays in this issue by examining organizational power issues related to researchers and institutional research boards (IRBs). Rather than taking a singular perspective on power, we use multiple perspectives and suggest that the cumulative analyses provide the best understanding of IRBs and organizational power. 相似文献
99.
Question classification systems play an important role in question answering systems and can be used in a wide range of other domains. The goal of question classification is to accurately assign labels to questions based on expected answer type. Most approaches in the past have relied on matching questions against hand-crafted rules. However, rules require laborious effort to create and often suffer from being too specific. Statistical question classification methods overcome these issues by employing machine learning techniques. We empirically show that a statistical approach is robust and achieves good performance on three diverse data sets with little or no hand tuning. Furthermore, we examine the role different syntactic and semantic features have on performance. We find that semantic features tend to increase performance more than purely syntactic features. Finally, we analyze common causes of misclassification error and provide insight into ways they may be overcome. 相似文献
100.