全文获取类型
收费全文 | 3533篇 |
免费 | 37篇 |
国内免费 | 6篇 |
专业分类
教育 | 2211篇 |
科学研究 | 487篇 |
各国文化 | 17篇 |
体育 | 274篇 |
综合类 | 8篇 |
文化理论 | 43篇 |
信息传播 | 536篇 |
出版年
2022年 | 19篇 |
2021年 | 23篇 |
2020年 | 46篇 |
2019年 | 60篇 |
2018年 | 113篇 |
2017年 | 159篇 |
2016年 | 139篇 |
2015年 | 88篇 |
2014年 | 106篇 |
2013年 | 534篇 |
2012年 | 120篇 |
2011年 | 143篇 |
2010年 | 116篇 |
2009年 | 87篇 |
2008年 | 79篇 |
2007年 | 114篇 |
2006年 | 62篇 |
2005年 | 77篇 |
2004年 | 66篇 |
2003年 | 61篇 |
2002年 | 54篇 |
2001年 | 87篇 |
2000年 | 72篇 |
1999年 | 62篇 |
1998年 | 54篇 |
1997年 | 43篇 |
1996年 | 51篇 |
1995年 | 25篇 |
1994年 | 33篇 |
1993年 | 20篇 |
1992年 | 45篇 |
1991年 | 44篇 |
1990年 | 29篇 |
1989年 | 38篇 |
1988年 | 34篇 |
1987年 | 31篇 |
1986年 | 35篇 |
1985年 | 39篇 |
1984年 | 38篇 |
1983年 | 22篇 |
1982年 | 33篇 |
1981年 | 25篇 |
1980年 | 16篇 |
1979年 | 35篇 |
1978年 | 30篇 |
1977年 | 21篇 |
1975年 | 15篇 |
1974年 | 21篇 |
1972年 | 24篇 |
1971年 | 18篇 |
排序方式: 共有3576条查询结果,搜索用时 171 毫秒
1.
2.
ABSTRACTThe preservation of artefacts in museum collections is profoundly affected by fluctuations in temperature and, especially, relative humidity (RH). Since the late nineteenth century, many studies have been carried out on the best way to control hygrothermal conditions. In old buildings located in maritime temperate climate zones (such as Portugal) with strong thermal inertia, and which have low ventilation rate (relative to the volume and number of visitors), daily and seasonal hygroscopic inertia may help to assure the maintenance of RH stabilization conditions. The use of expensive active systems may be minimized through the passive behaviour of internal finishing building materials. This work presents the results of an experimental laboratory study conducted in a flow chamber to demonstrate the enormous potential of hygroscopic materials in stabilizing interior relative humidity. Based in these results and in-situ monitoring in a museum housed in a building, located in Porto, with a typical construction of the 1950s (granite masonry and reinforced concrete slabs), a numerical analysis was done to quantify the influence of hygroscopic materials in stabilizing the interior relative humidity. 相似文献
3.
4.
5.
6.
V. J. Hinton D. C. De Vivo R. Fee E. Goldstein Y. Stern 《Learning disabilities research & practice》2004,19(3):146-154
Duchenne Muscular Dystrophy (DMD) is a neurogenetic developmental disorder that presents with progressive muscular weakness. It is caused by a mutation in a gene that results in the absence of specific products that normally localize to muscle cells and the central nervous system (CNS). The majority of affected individuals have IQs within the normal range, generally with lower verbal than performance IQ scores. Prior work has demonstrated selective deficits on tests of verbal span and immediate memory. For the current study, 26 boys with DMD (and normal intellectual function) and their unaffected siblings were evaluated. Paired comparisons demonstrated that the children with DMD had significantly poorer academic achievement scores than their siblings, even though their vocabulary levels and home and educational environments were comparable. Children with DMD also had more behavioral concerns, physical disabilities, and poorer verbal memory spans. Linear regression indicated that behavioral concerns, executive function, and physical disability did not contribute substantially to academic performance, whereas performance on verbal span did. DMD presents with a selective developmental aberration in verbal span that has wide‐ranging consequences on learning skills. 相似文献
7.
MICHAEL V. ELLIS 《Counselor Education & Supervision》1991,30(3):238-251
The purpose of this article was to revitalize and disentangle common misconceptions about a scientific agenda for clinical supervision. 相似文献
8.
9.
Portugal, as a small and increasingly integrated European economy, has been influenced by some of the major trends that defined the agenda of higher education policy in recent decades. Its backwardness – notably in terms of skills, education, and training – has frequently prompted a focus of attention on its international counterparts, particularly those in Europe, in search of affinities, solutions and errors to avoid. The search for guidance has also created an opportunity for the intervention of international organisations. Until Portugal joined the European Union (EU) in 1986, the Organisation for Economic Cooperation and Development (OECD) and the World Bank were the main agencies playing this role. Henceforth, those institutions lost some influence, and the European dimension gained increasing prominence. This article discusses the role of those international organisations in the definition of priorities for Portuguese higher education policy in recent decades, and provides a general overview of the outside perceptions of the Portuguese situation as understood by these international organisations. In particular, the article focuses on those interventions that promoted the influence of market mechanisms in the Portuguese higher education system by emphasising the need for higher education institutions (HEIs) to strive for increased economic responsiveness. 相似文献
10.