全文获取类型
收费全文 | 22444篇 |
免费 | 397篇 |
国内免费 | 31篇 |
专业分类
教育 | 16192篇 |
科学研究 | 1978篇 |
各国文化 | 203篇 |
体育 | 1718篇 |
综合类 | 34篇 |
文化理论 | 189篇 |
信息传播 | 2558篇 |
出版年
2022年 | 127篇 |
2021年 | 227篇 |
2020年 | 363篇 |
2019年 | 491篇 |
2018年 | 700篇 |
2017年 | 772篇 |
2016年 | 716篇 |
2015年 | 429篇 |
2014年 | 578篇 |
2013年 | 4234篇 |
2012年 | 563篇 |
2011年 | 631篇 |
2010年 | 482篇 |
2009年 | 457篇 |
2008年 | 520篇 |
2007年 | 500篇 |
2006年 | 441篇 |
2005年 | 387篇 |
2004年 | 364篇 |
2003年 | 327篇 |
2002年 | 378篇 |
2001年 | 424篇 |
2000年 | 396篇 |
1999年 | 402篇 |
1998年 | 210篇 |
1997年 | 230篇 |
1996年 | 254篇 |
1995年 | 213篇 |
1994年 | 210篇 |
1993年 | 193篇 |
1992年 | 302篇 |
1991年 | 300篇 |
1990年 | 329篇 |
1989年 | 311篇 |
1988年 | 295篇 |
1987年 | 248篇 |
1986年 | 256篇 |
1985年 | 322篇 |
1984年 | 266篇 |
1983年 | 255篇 |
1982年 | 196篇 |
1981年 | 206篇 |
1980年 | 176篇 |
1979年 | 240篇 |
1978年 | 214篇 |
1977年 | 194篇 |
1976年 | 160篇 |
1975年 | 128篇 |
1974年 | 120篇 |
1973年 | 147篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
91.
92.
93.
94.
95.
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
96.
Danuta A. Nitecki 《Archival Science》2004,4(1-2):17-44
Evaluators of library programs have different perspectives on why to conduct an evaluation and also how to do so. The author
suggests that a minimal approach to conducting a library program evaluation is to prove that the program exists. But this
perspective has expanded to include different degrees of interest in the client and operations, culminating in a combined
focus that leads evaluators to conduct outcome assessments. The chapter includes speculation on what motivates managers to
undertake an evaluation, a review of some ways that library evaluations are conducted, and a discussion of several examples
of program evaluations. Though there are not single directives for undertaking a library program evaluation, there are a variety
of tools and advice to entice librarians to do more of them as a way to improve understanding the value of a library to its
clientele and in society. 相似文献
97.
E Diane Johnson Paul E Pancoast Joyce A Mitchell Chi-Ren Shyu 《Journal of the Medical Library Association》2004,92(4):438-444
PURPOSE: This study describes the system architecture and user acceptance of a suite of programs that deliver information about newly updated library resources to clinicians' personal digital assistants (PDAs). DESCRIPTION: Participants received headlines delivered to their PDAs alerting them to new books, National Guideline Clearinghouse guidelines, Cochrane Reviews, and National Institutes of Health (NIH) Clinical Alerts, as well as updated content in UpToDate, Harrison's Online, Scientific American Medicine, and Clinical Evidence. Participants could request additional information for any of the headlines, and the information was delivered via e-mail during their next synchronization. Participants completed a survey at the conclusion of the study to gauge their opinions about the service. RESULTS/OUTCOME: Of the 816 headlines delivered to the 16 study participants' PDAs during the project, Scientific American Medicine generated the highest proportion of headline requests at 35%. Most users of the PDA Alerts software reported that they learned about new medical developments sooner than they otherwise would have, and half reported that they learned about developments that they would not have heard about at all. While some users liked the PDA platform for receiving headlines, it seemed that a Web database that allowed tailored searches and alerts could be configured to satisfy both PDA-oriented and e-mail-oriented users. 相似文献
98.
99.
Brigitte Mathiak Andreas Kupfer und Karl Neumann 《Informatik - Forschung und Entwicklung》2005,20(1-2):24-32
Zusammenfassung Mit den XML-basierten Sprachen GML, XSLT und SVG lassen sich Geodaten nicht nur anwendungsorientiert modellieren, sondern
auch karten?hnlich visualisieren. In dieser Fallstudie zeigen wir das, indem wir realistische Geodatenbest?nde der Landesvermessungs?mter
zun?chst mit der Geography Markup Language (GML) nachmodellieren. So mit GML strukturierte Daten werden dann mit der Extensible
Stylesheet Language for Transformation (XSLT) auf Elemente der Sprache Scalable Vector Graphics (SVG) abgebildet. Dabei wird
der Prozess der kartografischen Visualisierung durch XSLT-Konstrukte modelliert und auch gleichzeitig implementiert. Als Ergebnis
erhalten wir Grafiken, die den entsprechenden Karten der Landes?mter zumindest nicht un?hnlich sind.
Using the XML-based languages GML, XSLT and SVG, we modeled German geo data and also visualized it in map-like graphics. This case study shows the feasibility of that approach, by modelling the data with the Geography Markup Language (GML). Then, the GML-structured data is mapped with the Extensible Stylesheet Language for Transformation (XSLT) to elements of the language Scalable Vector Graphics (SVG). The process of cartographical visualization is thus modelled through XSLT-constructs and at same time also implemented. The results are graphics, which share close ressemblance to the corresponding maps of the official offices.
CR Subject Classification I.3.3,I.3.5,I.6.5,I.7.2,J.2 相似文献
100.
Sarah Anne Murphy Martha A Bedard Jill Crawley-Low Diane Fagen Jean-Paul Jette 《Journal of the Medical Library Association》2005,93(1):130-132
The Standards Committee of the Veterinary Medical Libraries Section was appointed in May 2000 and charged to create standards for the ideal academic veterinary medical library, written from the perspective of veterinary medical librarians. The resulting Standards for the Academic Veterinary Medical Library were approved by members of the Veterinary Medical Libraries Section during MLA '03 in San Diego, California. The standards were approved by Section Council in April 2005 and received final approval from the Board of Directors of the Medical Library Association during MLA '04 in Washington, DC. 相似文献