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   22159篇
  免费   298篇
  国内免费   60篇
教育   16399篇
科学研究   1518篇
各国文化   286篇
体育   1541篇
综合类   47篇
文化理论   138篇
信息传播   2588篇
  2021年   213篇
  2020年   281篇
  2019年   457篇
  2018年   604篇
  2017年   689篇
  2016年   619篇
  2015年   420篇
  2014年   561篇
  2013年   4686篇
  2012年   560篇
  2011年   566篇
  2010年   507篇
  2009年   513篇
  2008年   536篇
  2007年   505篇
  2006年   516篇
  2005年   468篇
  2004年   361篇
  2003年   347篇
  2002年   312篇
  2001年   420篇
  2000年   358篇
  1999年   313篇
  1998年   215篇
  1997年   223篇
  1996年   242篇
  1995年   209篇
  1994年   221篇
  1993年   204篇
  1992年   274篇
  1991年   280篇
  1990年   306篇
  1989年   289篇
  1988年   233篇
  1987年   240篇
  1986年   253篇
  1985年   227篇
  1984年   236篇
  1983年   245篇
  1982年   189篇
  1981年   195篇
  1980年   193篇
  1979年   244篇
  1978年   230篇
  1977年   164篇
  1976年   165篇
  1975年   153篇
  1974年   132篇
  1973年   141篇
  1971年   148篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
The aim was to examine cross-cultural variation in linguistic responsiveness to young children in 10 English-speaking mother–child dyads and 10 Italian-speaking mother– child dyads. All 20 children were late talkers who possessed delays in expressive vocabulary development but age-appropriate cognitive and receptive language skills. Dyads were filmed in 15 minute free play contexts, which were transcribed and coded for measures of maternal linguistic input (e.g. rate, MLU, labels, expansions) and child language productivity (e.g. utterances, different words used). The results revealed that the Italian mothers used more utterances, spoke more quickly and used a more diverse vocabulary than the Canadian mothers. The Italian children mirrored their mothers and also used more utterances and a more diverse vocabulary than the Canadian children. Mothers in both groups used similar percentages of responsive labels and expansions. However, Italian mothers responded to fewer of their children's vocalisations, using a smaller percentage of imitations and interpretations than the Canadian mothers. Correlations between maternal input and children's language productivity revealed that contingent language measures (e.g. imitations, interpretations, expansions) were related to high levels of productivity in children in both cultural groups. The results support the use of language interventions based on increasing maternal responsiveness for these children at the one-word stage of language development. They also point to differences that may be culturally based. For example, Italian mothers use faster rates of interaction and appear to have higher expectations for their children's verbal participation in interaction. This is reflected in higher rates of language production from their children, even though children in both cultural groups have similar vocabulary sizes.  相似文献   
52.
Williamson & Carrington argued, in a recent edition of Educational Studies, the need for a major investigation of the effectiveness of an apprenticeship approach to reading. This paper considers some of the problems associated with such investigations. It also seeks to clarify some of the terminology in the whole language repertoire before looking in detail at shared reading as an important part of such approaches. The article concludes by suggesting that ethnographic studies are the means by which issues in the teaching and learning of reading may best be clarified, and teachers and children assisted.  相似文献   
53.
54.
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   
55.
56.
57.
58.
Fielding H. Garrison's paper "The medical periodical and the scientific society" cited the Buffalo Medical Journal in the company of eminent periodicals published in Berlin, Boston, and Edinburgh. This article provides an overview of the Journal and places it in context of 19th-century medical journalism. The Journal is assessed in terms of original scientific contributions and as a source of social and local history.  相似文献   
59.
60.
This paper supplements information given in earlier papers on the UCLA MEDLARS Search Station. Four major machine problem areas in the operation of a decentralized station are identified: adjustments required to run a large information retrieval type program in an academic computing facility serving many users; handicap in running time for COBOL programs; advent of the third generation of computers with attendant preparation; and need for constant current communication among all members of a decentralized network system. Statistics are given for the initial operating period, January-May 1966: 119 search requests received, 109 formulated, and 60 fully processed. Parallel searches with other MEDLARS installations, comparisons of MEDLARS and manual Index Medicus searches, and other search activities are reported.  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