首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   14298篇
  免费   148篇
  国内免费   15篇
教育   10043篇
科学研究   1564篇
各国文化   200篇
体育   975篇
综合类   6篇
文化理论   154篇
信息传播   1519篇
  2020年   151篇
  2019年   229篇
  2018年   263篇
  2017年   330篇
  2016年   269篇
  2015年   205篇
  2014年   287篇
  2013年   3071篇
  2012年   234篇
  2011年   256篇
  2010年   208篇
  2009年   251篇
  2008年   287篇
  2007年   272篇
  2006年   267篇
  2005年   225篇
  2004年   211篇
  2003年   217篇
  2002年   190篇
  2001年   192篇
  2000年   217篇
  1999年   188篇
  1998年   137篇
  1997年   141篇
  1996年   153篇
  1995年   137篇
  1994年   149篇
  1993年   161篇
  1992年   192篇
  1991年   209篇
  1990年   197篇
  1989年   206篇
  1988年   167篇
  1987年   175篇
  1986年   190篇
  1985年   213篇
  1984年   183篇
  1983年   194篇
  1982年   159篇
  1981年   172篇
  1980年   135篇
  1979年   211篇
  1978年   183篇
  1977年   151篇
  1976年   137篇
  1975年   130篇
  1974年   121篇
  1973年   124篇
  1972年   108篇
  1971年   97篇
排序方式: 共有10000条查询结果,搜索用时 796 毫秒
51.
52.
53.
54.
55.
This Basic Journal List of forty-eight journal titles is intended as a selection guide for the librarian of the small hospital. It is based on a survey of physicians in Virginia who were asked to review journal titles contained in the 1967 edition of a list compiled by Mr. Alfred N. Brandon. The List is designed for the library in a hospital of from 100 to 300 beds and for the active clinician.  相似文献   
56.
Time series analysis was used to investigate the hypothesis that during acquisition of a motor skill, knowledge of results (KR) information is used to generate a stable internal referent about which response errors are randomly distributed. Sixteen subjects completed 50 acquisition trials of each of three movements whose spatial-temporal characteristics differed. Acquisition trials were either blocked, with each movement being presented in series, or randomized, with the presentation of movements occurring in random order. Analysis of movement time data indicated the contextual interference effect reported in previous studies was replicated in the present experiment. Time series analysis of the acquisition trial data revealed the majority of individual subject response patterns during blocked trials were best described by a model with a temporarily stationary, internal reference of the criterion and systematic, trial-to-trial variation of response errors. During random trial conditions, response patterns were usually best described by a "White-noise" model. This model predicts a permanently stationary, internal reference associated with randomly distributed response errors that are unaffected by KR information. These results are not consistent with previous work using time series analysis to describe motor behavior (Spray & Newell, 1986).  相似文献   
57.
EPIC is a service that provides keyword or subject access to the OCLC Online Union Catalog (OLUC). This capability increases the success rate for title location as well as the potential uses of the OLUC. The features of the EPIC system, application of these features to the OLUC, and specific uses in health sciences libraries are described in this article.  相似文献   
58.
59.
As a gatekeeper to medical literature and a critical link in the delivery of information to physicians, the librarian's role raises the issue of the librarian's professional liability. The paper suggests several ways in which liability may attach to the librarian or the librarian's employers. Although the librarian's personal risk is negligible, the physician's exposure due to ineffective library work is substantial since the courts have held that a physician must keep abreast of progress in his field. Librarians can also become associated with professional liability actions as part of a case against a physician or hospital through the legal doctrine of vicarious liability. The paper concludes by suggesting several proactive steps for health sciences librarians to pursue to insulate themselves from professional liability and to insulate physicians and institutions from vicarious liability.  相似文献   
60.
Governments worldwide are increasingly using Web-based business models to enhance their service delivery. Yet the concept of the business model is unexplored within the context of e-government. Drawing upon the literature on e-commerce, we develop a taxonomy for analyzing Web-based business models for e-government. Based on a systematic survey of 59 e-government Web sites in the Netherlands, our findings indicate that most of the Web sites use the content provider or direct-to-customer business models, while only a few are using novel business models. Overall, the concept of business model is appealing and useful in the public sector. Specifically it compliments research on Web site quality by analyzing and describing Web sites using atomic e-government business models and suggesting improvements by using combinations of business models.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号