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   10132篇
  免费   174篇
  国内免费   7篇
教育   7434篇
科学研究   623篇
各国文化   198篇
体育   784篇
综合类   5篇
文化理论   152篇
信息传播   1117篇
  2022年   55篇
  2021年   95篇
  2020年   187篇
  2019年   267篇
  2018年   345篇
  2017年   383篇
  2016年   356篇
  2015年   265篇
  2014年   294篇
  2013年   2296篇
  2012年   268篇
  2011年   285篇
  2010年   260篇
  2009年   229篇
  2008年   325篇
  2007年   248篇
  2006年   240篇
  2005年   220篇
  2004年   180篇
  2003年   208篇
  2002年   187篇
  2001年   150篇
  2000年   140篇
  1999年   138篇
  1998年   121篇
  1997年   120篇
  1996年   133篇
  1995年   139篇
  1994年   131篇
  1993年   114篇
  1992年   128篇
  1991年   123篇
  1990年   114篇
  1989年   103篇
  1988年   96篇
  1987年   83篇
  1986年   77篇
  1985年   83篇
  1984年   65篇
  1983年   85篇
  1982年   84篇
  1981年   83篇
  1980年   97篇
  1979年   86篇
  1978年   64篇
  1977年   53篇
  1976年   58篇
  1975年   52篇
  1974年   43篇
  1971年   34篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Jenny Morris, freelance researcher, David Abbott, research associate at the Norah Fry Research Centre at the University of Bristol, and Linda Ward, Director of the Norah Fry Research Centre at the University of Bristol, carried out research to look at whether the current system of legislation and regulation is adequately protecting and promoting the interests of disabled children placed at residential schools. This article summarises some findings from the research which investigated the decision-making processes leading to residential special school placements and explored the involvement of education and social services authorities after placements have been made. The research found that the needs of individual children are not central to these decision-making processes; and that the local authorities who make such placements do not pay sufficient attention to protecting and promoting children's educational or care needs once they have gone away to school. Jenny Morris, David Abbott and Linda Ward indicate some of the ways in which current practice could be improved; make recommendations for future developments; and call for further research into the role of special residential schools in the context of policy on educational and social inclusion.  相似文献   
32.
33.
This paper is an overview of the issues and concerns in the last decade of electronic records research. It highlights some achievement and identifies areas in which there remains a need for work, but mostly it examines the changing perception of what constituted the important questions in a field which was evolving quickly.  相似文献   
34.
35.
36.
Working Graphs     
  相似文献   
37.
An investigation has been undertaken at St Andrew’s church, Walpole St Andrew, Norfolk, to establish the underlying causes of the observed stone decay to the upper parts of the six stone piers. The stone decay was first recorded in the early 1930s. The salt-contaminated masonry within the church has been shown to undergo severe salt decay during the summer, with little damage occurring over the winter months. The south aisle piers have been shown to decay 2.5 times faster than the north aisle piers. Although crystallization–hydration cycles have been identified, the rate of decay is at its greatest when the cycling is relatively infrequent. This was not the expected trend. Furthermore, it has been shown that during extended periods where the ambient relative humidity is less than 75%, the rate of decay reaches a maximum. It is the length of this ‘drying’ period that apparently has the greatest influence on the rate of decay and could explain the significant difference in the rate of decay between the south and north aisle piers. The results have serious implications for passive conservation, where it is often recommended to lower the ambient relative humidity to well below the equilibrium relative humidity of the salt contaminant, to avoid crystallization–hydration cycles. Since, at the time of building, the church was situated on the coast, it is possible that the sodium chloride contamination occurred during the building process (1440–1520), particularly since the area was prone to sea-flooding at this time. Alternatively, the salt could have been applied as a treatment during the general restoration of 1897. Whatever the source of the salt, it seems likely that the ambient environment was changed by the insertion of a sealed floor in 1897, which could account for the onset of the salt decay.  相似文献   
38.
39.
40.
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