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   997篇
  免费   14篇
教育   789篇
科学研究   43篇
各国文化   5篇
体育   33篇
文化理论   4篇
信息传播   137篇
  2022年   6篇
  2021年   20篇
  2020年   16篇
  2019年   22篇
  2018年   39篇
  2017年   37篇
  2016年   28篇
  2015年   24篇
  2014年   34篇
  2013年   223篇
  2012年   32篇
  2011年   35篇
  2010年   22篇
  2009年   28篇
  2008年   37篇
  2007年   22篇
  2006年   23篇
  2005年   16篇
  2004年   26篇
  2003年   27篇
  2002年   19篇
  2001年   17篇
  2000年   24篇
  1999年   13篇
  1998年   13篇
  1997年   12篇
  1996年   15篇
  1995年   19篇
  1994年   16篇
  1993年   15篇
  1992年   14篇
  1991年   9篇
  1990年   10篇
  1989年   5篇
  1988年   7篇
  1987年   5篇
  1986年   5篇
  1985年   10篇
  1984年   11篇
  1983年   6篇
  1982年   7篇
  1981年   9篇
  1980年   8篇
  1979年   2篇
  1978年   5篇
  1977年   4篇
  1976年   2篇
  1975年   3篇
  1974年   2篇
  1844年   1篇
排序方式: 共有1011条查询结果,搜索用时 31 毫秒
71.
72.
We develop and propose a new counting method at the aggregate level for contributions to scientific publications called modified fractional counting (MFC). We show that, compared to traditional complete-normalized fractional counting, it eliminates the extreme differences in contributions over time that otherwise occur between scientists that mainly publish alone or in small groups and those that publish with large groups of co-authors. As an extra benefit we find that scientists in different areas of research turn out to have comparable average contributions to scientific articles. We test the method on scientists at Norway’s largest universities and find that, at an aggregate level, it indeed supports comparability across different co-authorship practices as well as between areas of research. MFC is thereby useful whenever the research output from institutions with different research profiles are compared, as e.g., in the Leiden Ranking. Finally, as MFC is actually a family of indicators, depending on a sensitivity parameter, it can be adapted to the circumstances.  相似文献   
73.
74.
75.
Heart failure (HF) is a frequent chronic disease in elderly people and represents a major health and economic burden. The accurate diagnosis of HF and the identification of high risk patients is mandatory to select the appropriate therapy and care. HF is associated to cardiac remodeling and inflammation and to the release of neurohormones. If natriuretic peptides remain the biomarkers of choice for the diagnosis and the prognosis of HF, several biomarkers related to cardiac remodeling and inflammation are available for testing and may add valuable information for the risk estimation of HF patients and for the selection of the most appropriated therapy. Furthermore, the quest for new efficient biomarkers of cardiac remodeling and inflammation is still ongoing and new candidates have been identified for a potential use in daily clinical practices. However, before their potential translation to routine parameters several challenges ranging form the analytical validation to the cost-effectiveness estimation should be considered.  相似文献   
76.
77.
Objective:The primary objective of this study was to determine how community college health sciences librarians perceive their proficiencies in the essential skills, knowledge, and abilities necessary for the practice of a health information professional as defined by the Medical Library Association (MLA) Competencies for Lifelong Learning and Professional Success. A secondary objective was to determine their current level of engagement with the professional community and identify barriers to further professional development.Methods:A survey was posted to various email discussion lists, and volunteer follow-up interviews were conducted.Results:The survey was completed by seventy-five community college health sciences librarians, and seven follow-up interviews were performed. Survey results indicated that community college health sciences librarians perceived themselves as having intermediate or advanced intermediate proficiency in the six MLA competencies. Survey and interview results indicated that community college health sciences librarians were engaged with the profession and faced the same barriers to continued professional development and continued education as other academic librarians.Conclusion:The results affirm that community college librarians who are responsible for collections and services in the health sciences meet the MLA competencies, which fills a gap in the literature regarding how these librarians develop professional competencies and are involved in professional associations. The results suggest that community college librarians can improve their skill levels by continuing their education and following trends in the literature.  相似文献   
78.
To understand the experiences and views of childbearing women in the United States and trends over time, Childbirth Connection carried out the third national Listening to Mothers survey among 2,400 women who gave birth in U.S. hospitals to a single baby from mid-2011 to mid-2012 and could participate in English. A follow-up survey directed to the same participants explored postpartum experiences, in depth and well into the second year after birth; views about maternity care; and some additional pregnancy and birth items. Harris Interactive conducted the surveys using a validated methodology that includes data weighting to ensure that results closely reflect the target population. The follow-up survey was reported in Listening to Mothers III: New Mothers Speak Out.  相似文献   
79.
British universities have always been the market leader in recruiting Hong Kong students to study overseas or to take part in learning programmes. As the transfer of Hong Kong's sovereignty to the People's Republic of China (PRC) in 1997 approaches, some changes in market demands and incoming competitors have complicated the external environment of the market for higher education in Hong Kong. A major impetus for the incoming rivalry of the PRC is the recognition of qualifications obtained in PRC by the Hong Kong Government and continuing economic growth which in turn creates a tremendous demand for professional and managerial personnel in PRC. With the current sophisticated marketing practices and quality services to potential customers, this article attempts to provide information that may help British universities to discover their competitive edge in capitalizing on the experience and strengths of their higher education tradition and system.  相似文献   
80.
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