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   28090篇
  免费   431篇
  国内免费   65篇
教育   20105篇
科学研究   2709篇
各国文化   290篇
体育   2017篇
综合类   57篇
文化理论   234篇
信息传播   3174篇
  2021年   294篇
  2020年   405篇
  2019年   600篇
  2018年   848篇
  2017年   899篇
  2016年   828篇
  2015年   547篇
  2014年   776篇
  2013年   5300篇
  2012年   723篇
  2011年   737篇
  2010年   669篇
  2009年   625篇
  2008年   658篇
  2007年   646篇
  2006年   652篇
  2005年   574篇
  2004年   483篇
  2003年   448篇
  2002年   441篇
  2001年   633篇
  2000年   574篇
  1999年   459篇
  1998年   282篇
  1997年   316篇
  1996年   327篇
  1995年   249篇
  1994年   267篇
  1993年   244篇
  1992年   382篇
  1991年   364篇
  1990年   423篇
  1989年   390篇
  1988年   331篇
  1987年   350篇
  1986年   329篇
  1985年   336篇
  1984年   293篇
  1983年   253篇
  1982年   227篇
  1981年   210篇
  1980年   203篇
  1979年   323篇
  1978年   238篇
  1977年   187篇
  1976年   176篇
  1975年   178篇
  1974年   172篇
  1973年   174篇
  1971年   171篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Chaos theory, informational needs, and natural disasters   总被引:2,自引:0,他引:2  
This study applies chaos theory to a system-wide analysis of crisis communication in a natural disaster. Specifically, we analyze crisis communication during the 1997 Red River Valley flood in Minnesota and North Dakota. This flood, among the worst in modern American history, consumed entire metropolitan areas, displacing thousands of people. The conditions and decisions leading to the disaster, and the subsequent reactions are retraced. Communication related to river crest predictions (fractals), the shock at the magnitude of the crisis (cosmology episode), novel forms of reorganizing (self-organization), and agencies that aided in establishing a renewed order (strange attractors) are evaluated. Ultimately, we argue that preexisting sensemaking structures favoring rationalized, traditional views of a complex system led officials to make inappropriately unequivocal predictions and ultimately diminished the effectiveness of the region's crisis communication and planning.  相似文献   
52.
53.
The roles of academic health sciences librarians are continually evolving as librarians initiate new programs and services in response to developments in computer technology and user demands. However, statistics currently collected by libraries do not accurately reflect or measure these new roles. It is essential for librarians to document, measure, and evaluate these new activities to continue to meet the needs of users and to ensure the viability of their professional role. To determine what new measures should be compiled, the authors examined current statistics, user demands, professional literature, and current activities of librarians as reported in abstracts of poster sessions at Medical Library Association annual meetings. Three new categories of services to be measured are proposed. The first, consultation, groups activities such as quality filtering and individual point-of-need instruction. The second, outreach, includes activities such as working as liaisons, participating in grand rounds or morning report, and providing continuing education. The third area, Web authoring, encompasses activities such as designing Web pages, creating online tutorials, and developing new products. Adding these three measures to those already being collected will provide a more accurate and complete depiction of the services offered by academic health sciences librarians.  相似文献   
54.
55.
冰上课教学方法与难点教学实践初探   总被引:1,自引:1,他引:0  
在教学实践中感到冰上课的难点有2个:站立和弯道技术.就冰上站立和弯道技术进行了技术和教学方法的初步探讨.在冰上首先要解决站立问题,能站立后滑行就比较容易;另一个难点就是弯道滑行,这点若也解决,冰上课就成功了.  相似文献   
56.
Executives recognize the value of maintaining access to information. More managers filter their own e-mail rather than have assistants do this task. Organizing and storing data for future use are left to the personal preference of the individual manager. Is this in the best interest of the organization? Are data being stored in a manner causing them to be irretrievable in the future? Are irrelevant data being stored? This study investigates the strategies used to store and retrieve e-mail. The results revealed that the primary search strategy was a reliance on memory. The labels assigned to the e-mail folders triggered the user's memory. Although, in the short term, memory is sufficient for organizing and retrieving information, the lack of transferability and preservation of this information poses a danger. The association between the electronic file label and the stored information is unique to the manager and may lead to inaccessibility of relevant corporate knowledge in the future.  相似文献   
57.
This article reviews the literature pertaining to the written composing ability of students with learning disabilities that was published primarily in the decade from 1980 to 1990. The papers included are either reports of research or discussions of instructional procedures that are based on research. The topics addressed include story composition, expository writing, training/intervention research, and rationales/procedures for instruction.  相似文献   
58.
Book reviews     
Association of Research Libraries  相似文献   
59.
What is the typical amount of student answer‐changing that takes place in a low‐stakes test environment? Can we use this information to look for evidence of improper answer‐changing (cheating) on high‐stakes test?  相似文献   
60.
The many challenges faced by health sciences libraries of all types and sizes often require innovative solutions. When an innovative solution involves calculated risk taking, the approach is called intrapreneurial. At the University of Miami School of Medicine, an intrapreneurial approach solved the fiscal problems of the biomedical communications unit. The Louis Calder Memorial Library inherited these problems when the Department of the Library and Biomedical Communications was created in the early 1980s. In this paper, two intrapreneurial programs are described, and the benefit and suitability of this management style to information services are demonstrated.  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