全文获取类型
收费全文 | 718篇 |
免费 | 7篇 |
国内免费 | 1篇 |
专业分类
教育 | 605篇 |
科学研究 | 21篇 |
各国文化 | 3篇 |
体育 | 34篇 |
综合类 | 2篇 |
文化理论 | 8篇 |
信息传播 | 53篇 |
出版年
2023年 | 5篇 |
2020年 | 6篇 |
2019年 | 11篇 |
2018年 | 16篇 |
2017年 | 15篇 |
2016年 | 21篇 |
2015年 | 18篇 |
2014年 | 16篇 |
2013年 | 171篇 |
2012年 | 18篇 |
2011年 | 7篇 |
2010年 | 12篇 |
2009年 | 9篇 |
2008年 | 13篇 |
2007年 | 14篇 |
2006年 | 10篇 |
2005年 | 16篇 |
2004年 | 15篇 |
2003年 | 12篇 |
2002年 | 7篇 |
2001年 | 7篇 |
2000年 | 14篇 |
1999年 | 9篇 |
1998年 | 12篇 |
1997年 | 13篇 |
1996年 | 5篇 |
1995年 | 14篇 |
1994年 | 7篇 |
1993年 | 7篇 |
1992年 | 18篇 |
1991年 | 7篇 |
1990年 | 18篇 |
1989年 | 8篇 |
1988年 | 11篇 |
1986年 | 6篇 |
1985年 | 12篇 |
1984年 | 8篇 |
1983年 | 7篇 |
1982年 | 11篇 |
1981年 | 6篇 |
1980年 | 7篇 |
1979年 | 10篇 |
1978年 | 9篇 |
1975年 | 7篇 |
1974年 | 5篇 |
1973年 | 7篇 |
1972年 | 7篇 |
1971年 | 7篇 |
1970年 | 11篇 |
1968年 | 6篇 |
排序方式: 共有726条查询结果,搜索用时 718 毫秒
1.
2.
3.
4.
Nigel Lees 《Learned Publishing》2004,17(3):189-194
An account is given of the effects of the EU Copyright Directive on the working of the library of a learned society and the changes in practices required to conform with it. 相似文献
5.
ABSTRACTControl of relative humidity (RH) for collections care is challenging in U.K. historic houses because they are often highly ventilated with poor heat retention, a porous building fabric and naturally tend to high (60–80%) RH if unheated. The significance of the building means that large-scale modifications and installation of air handling systems may be unfeasible and undesirable for the conservation of the building. In the late 1980s the National Trust, for English, Wales and Northern Ireland, investigated conservation heating as an RH control method that works with the natural environment of historic buildings, mimicking historic heating and requiring only modification of existing heating services or a light touch installation of new heating systems. The National Trust adopted conservation heating as its preferred method for environmental control in historic buildings from the 1990s. This method was presented at the IIC 1994 Ottawa congress on preventive conservation. Conservation heating has since been adopted by many historic house management organisations, particularly across north-west Europe, where it is well suited to the climate. This paper reviews conservation heating developments implemented by the National Trust since 1994, in response to a changing external context, new knowledge and developments in operational practice. 相似文献
6.
A comparison of 1,096 professional journalists in China and the United States on attitudes toward attribution and plagiarism reveals Chinese journalists were more likely to see attribution as a practice to be embraced regardless of career longevity and culture, suggesting journalistic norms are more important than a collectivist orientation. Attribution was more likely to be embraced by those who see principles as more important than expediency, affirming research that plagiarism is hardly a monolithic concept. Overall, journalists in the two nations did not vary significantly in their attitudes toward plagiarism, despite vast differences in culture and politics as well as evidence that in some other fields China is more accepting of reusing material without attribution. The data show that among journalists, attitudes toward plagiarism are shared across national boundaries, reinforcing related research showing that a journalism culture exists and is shared at least in part across national boundaries. 相似文献
7.
8.
9.
Animals were presented with (1) one solution which differed from that of the test solution, (2) a series of distinctly flavored solutions whose flavors differed from that of the test solution, or (3) with a flavored solution whose flavor was the same as that of the test solution. When animals received the solution whose flavor was the same as that of the test solution prior to a test for neophobia and prior to a conditioning trial, neophobia was reduced and aversions were weakened. However, when animals received a solution or a series of solutions whose flavors differed from that of the test solution, neophobia was reduced but conditioned aversions were unaffected. Presentations of solutions that differed from the test solution following aversion formation left the association between the taste of the test solution and the effects of the aversion-inducing treatment intact. In a final experiment it was discovered that neophobia was reduced as much when animals drank solutions whose flavors changed every third day as when they drank the same solution throughout testing. 相似文献
10.