全文获取类型
收费全文 | 9097篇 |
免费 | 142篇 |
国内免费 | 3篇 |
专业分类
教育 | 6286篇 |
科学研究 | 1047篇 |
各国文化 | 82篇 |
体育 | 773篇 |
综合类 | 3篇 |
文化理论 | 99篇 |
信息传播 | 952篇 |
出版年
2022年 | 67篇 |
2021年 | 111篇 |
2020年 | 149篇 |
2019年 | 276篇 |
2018年 | 364篇 |
2017年 | 322篇 |
2016年 | 319篇 |
2015年 | 175篇 |
2014年 | 222篇 |
2013年 | 1713篇 |
2012年 | 203篇 |
2011年 | 192篇 |
2010年 | 188篇 |
2009年 | 161篇 |
2008年 | 184篇 |
2007年 | 145篇 |
2006年 | 144篇 |
2005年 | 121篇 |
2004年 | 142篇 |
2003年 | 108篇 |
2002年 | 112篇 |
2001年 | 142篇 |
2000年 | 133篇 |
1999年 | 113篇 |
1998年 | 83篇 |
1997年 | 86篇 |
1996年 | 81篇 |
1995年 | 64篇 |
1994年 | 60篇 |
1993年 | 87篇 |
1992年 | 108篇 |
1991年 | 113篇 |
1990年 | 108篇 |
1989年 | 99篇 |
1988年 | 86篇 |
1987年 | 102篇 |
1986年 | 86篇 |
1985年 | 112篇 |
1984年 | 97篇 |
1983年 | 90篇 |
1982年 | 85篇 |
1981年 | 72篇 |
1980年 | 66篇 |
1979年 | 98篇 |
1978年 | 93篇 |
1977年 | 74篇 |
1976年 | 63篇 |
1974年 | 66篇 |
1973年 | 64篇 |
1972年 | 60篇 |
排序方式: 共有9242条查询结果,搜索用时 31 毫秒
31.
Susan J. Gardner John Eric Juricek F. Grace Xu 《The Journal of Academic Librarianship》2008,34(1):16-24
Web sites are increasingly used by academic libraries to promote key services and collections to teaching faculty. This study analyzes the content, location, language, and technological features of fifty-four academic library Web pages designed especially for faculty to expose patterns in the development of these pages. 相似文献
32.
Zusammenfassung Diese Arbeit stellt ein Modell und ein System zur Steuerung von Exoskeletten mit Hilfe von elektrischen
Signalen vor, die an den Muskeln des Benutzers gemessen werden. Anhand dieser Signale wird der eigene Drehmomentbeitrag
des Benutzer zur gewünschten Bewegung abgesch?tzt, und ein einstellbarer Faktor bestimmt das vom
Exoskelett hinzugefügte Drehmoment in Bezug auf den Beitrag des Benutzers. Die Signale werden durch
ein komplexes biomechanisches Modell ausgewertet.
CR subject classification J.3 ; J.7 ; I.6.5 相似文献
33.
György Péteri 《Minerva》1996,34(4):367-380
Conclusions On the basis of these findings, I suggest that the structure and organisation of the field of Hungarian economics under state socialism should be described as a case of partitioned bureaucracy.9 The compromise between research economists and the political elite in the New Course era between 1953 and 195510 survived the post-1956 reaction in so far as political economy, with its predominantly legitimatory and ideological functions, remained partitioned from the other sectors in the field through the remainder of the state-socialist period. This secured considerable protection both for Marxist-Leninist political economy—which faced the destabilising effects of exposure to the findings of serious empirical research—and for the other sectors, which were professionally oriented and earnestly interested in the pursuit of unbiased empirical research, free from stifling agitprop interference. Our data concerning the reputational control of the field reflects only one, although very important, aspect of this partitioning. Another and much plainer aspect is that, from the early 1960s, the Agitation and Propaganda Department of the Central Committee no longer exercised control over the field, except in the political economy sector.The proposition about the mechanism paradigm should not be taken seriously as a statement of a Kuhnian type of intellectual organisation of Hungarian economics, with reform economics at its hard theoretical core. But it should certainly be taken seriously as a reflection of the sociopolitical structure which emerged and developed from the mid-1950s onwards. Neither the politicians nor the economists saw as necessary or even contemplated the integration of Hungarian economic research with Western mainstream economic thought. In exchange for the professional expertise and socio-economic intelligence necessary for the exercise of power, Hungary's state-socialist political class offered their economists relative autonomy and freedom from interference. The price the economists had to pay was partly to refrain from openly and systematically challenging the beliefs perpetuated by the political economy of socialism, and partly to accept in their research the paramountcy of policy orientation. But this burden they assumed willingly since it made them the only group within Hungary's academic intelligentsia—indeed, the only group in Hungarian society outside the political class—with the privilege of being coopted to the institutions with power over some restricted domains of policymaking. After 1989, especially under the conservative Antall government, this proved less than advantageous.11 Although the benevolence of many critics is open to question, it could greatly benefit the field if the economists' expulsion from contemporary politics went hand in hand with provision of the material, intellectual and institutional conditions for a new approach where a fundamentally scientific orientation is paramount. 相似文献
34.
35.
Among the huge maze of resources available on the Internet, UnCoverWeb stands out as a valuable tool for medical libraries. This up-to-date, free-access, multidisciplinary database of periodical references is searched through an easy-to-learn graphical user interface that is a welcome improvement over the telnet version. This article reviews the basic and advanced search techniques for UnCoverWeb, as well as providing information on the document delivery functions and table of contents alerting service called Reveal. UnCover's currency is evaluated and compared with other current awareness resources. System deficiencies are discussed, with the conclusion that although UnCoverWeb lacks the sophisticated features of many commercial database search services, it is nonetheless a useful addition to the repertoire of information sources available in a library. 相似文献
36.
37.
相似文献
38.
39.
F W Roper 《Bulletin of the Medical Library Association》1979,67(4):359-364
This paper reviews the current situation in library school education for medical librarianship in the United States and Canada based on information from a questionnaire sent to teachers of courses in medical librarianship in accredited library schools. Since 1939, when the first course devoted entirely to medical librarianship was offered at Columbia University, courses have been introduced into the curricula of at least forty-seven of the ALA-accredited library schools. In 1978 there were seventy courses available through forty-seven library schools. Possibilities for specialization in medical librarianship are examined. Course content is reviewed. Implications of the MLA certification examination for library school courses are explored. 相似文献
40.
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