全文获取类型
收费全文 | 30455篇 |
免费 | 432篇 |
国内免费 | 173篇 |
专业分类
教育 | 21716篇 |
科学研究 | 3091篇 |
各国文化 | 274篇 |
体育 | 2354篇 |
综合类 | 53篇 |
文化理论 | 187篇 |
信息传播 | 3385篇 |
出版年
2021年 | 277篇 |
2020年 | 409篇 |
2019年 | 622篇 |
2018年 | 867篇 |
2017年 | 856篇 |
2016年 | 836篇 |
2015年 | 531篇 |
2014年 | 734篇 |
2013年 | 5704篇 |
2012年 | 711篇 |
2011年 | 755篇 |
2010年 | 616篇 |
2009年 | 607篇 |
2008年 | 626篇 |
2007年 | 649篇 |
2006年 | 659篇 |
2005年 | 603篇 |
2004年 | 486篇 |
2003年 | 476篇 |
2002年 | 439篇 |
2001年 | 572篇 |
2000年 | 514篇 |
1999年 | 478篇 |
1998年 | 286篇 |
1997年 | 290篇 |
1996年 | 332篇 |
1995年 | 295篇 |
1994年 | 270篇 |
1993年 | 268篇 |
1992年 | 405篇 |
1991年 | 405篇 |
1990年 | 436篇 |
1989年 | 443篇 |
1988年 | 360篇 |
1987年 | 377篇 |
1986年 | 370篇 |
1985年 | 400篇 |
1984年 | 375篇 |
1983年 | 365篇 |
1982年 | 303篇 |
1981年 | 292篇 |
1980年 | 278篇 |
1979年 | 404篇 |
1978年 | 331篇 |
1977年 | 275篇 |
1976年 | 253篇 |
1975年 | 229篇 |
1974年 | 239篇 |
1973年 | 222篇 |
1971年 | 220篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
Twelve Chinese academic journals, indexed by SCI and financed by the National Natural Science Foundation (NNSF), were analysed using the 2000–2003 Total Citations and Impact Factor data from JCR. It is concluded that the quality of Chinese journals is generally low and has remained so despite recent government measures aimed at improvement. Several factors are influential – particularly the Chinese government's policy of encouraging submission to foreign journals. Finance, management, and the academic degree policy are also obstacles. It is suggested that the Chinese government should reconsider its current policies so as to encourage higher quality in domestic periodicals and thus a greater recognition of Chinese journals by the international academic community. 相似文献
132.
Jennifer R. Warren Michael L. Hecht David A. Wagstaff Elvira Elek Khadidiatou Ndiaye Patricia Dustman Flavio F. Marsiglia 《Journal of Applied Communication Research》2006,34(2):209-227
This study sought to determine if exposure to two communication-oriented activities, videotapes and public service announcements, accounts for changes in substance use among adolescents participating in the Drug Resistance Strategies Project's keepin' it REAL adolescent substance use prevention curriculum. Middle-school students (4,734, 72% Latino) responded to questionnaires related to these analyses. An analysis of covariance (ANCOVA) model was fit separately to six substance use outcomes. The results suggested that intervention students who saw four or five videos engaged in less substance use in the past month than did students who saw fewer videos. Having seen the PSAs one or more times did not predict the reported change in substance use. 相似文献
133.
134.
Creating Access to Invisible Special Collections: Using Participatory Management to Reduce a Backlog
The University of Colorado at Boulder Libraries used participatory management to reduce a special collections backlog. Without an increase in budget or staffing, technical and public services departments designed a pilot project to redeploy internal human resources in a collaborative manner. The process of backlog management is discussed. 相似文献
135.
Subjective Social Location: Data From 21 Nations 总被引:1,自引:0,他引:1
136.
137.
Sandra L De Groote Marceline Doranski 《Journal of the Medical Library Association》2004,92(3):341-348
OBJECTIVES: The purpose of this study is to determine how personal digital assistants (PDAs) are used on an academic health sciences campus to define the level of training and support the library can provide to the students and faculty. METHOD: A Web-based questionnaire was developed. A total of 1,538 health sciences faculty and residents were sent an email message requesting participation. Data from the returned surveys were analyzed with SPSS. RESULTS: Sixty-one percent of survey respondents used PDAs. The address book, date book, and calculator were the most common uses reported for PDAs. Residents also reported a high use of drug databases on their PDAs. Most survey respondents indicated they would like to learn more about clinical resources for PDAs. CONCLUSIONS: Many opportunities exist for librarians to provide training and support for PDAs, in addition to evaluation and promotion of clinical software for PDAs. 相似文献
138.
139.
Techtarget Todd R. Weiss 《信息系统工程》2005,(3):16
keystone公司长期停滞的ERP项目终于宣告成功, 系统将 130 个厂房,全美国2000 多员工连接在一起。回首keystone 信息化历程,其经验教训值得我们深思。 相似文献
140.
Barbara L. Craig 《Archival Science》2005,5(2-4):391-402
The author, a professor at the University of Toronto, touches briefly on the extensive and rich archival literature that supports
the teaching of macroappraisal, but notes that this is not the only educational material she offers her students when teaching
appraisal theory. She discusses the usefulness to archivists of literature from the fields of ethnography, organizational
knowing, records in history, personal documentary behaviour, memory, and communications, noting that the use of texts from
these fields can encourage students to reflect on their own presumptions and to develop a taste for the wide reading and research
that must support appraisal. 相似文献