全文获取类型
收费全文 | 2938篇 |
免费 | 7篇 |
专业分类
教育 | 2029篇 |
科学研究 | 528篇 |
体育 | 86篇 |
综合类 | 7篇 |
文化理论 | 62篇 |
信息传播 | 233篇 |
出版年
2023年 | 1篇 |
2022年 | 6篇 |
2021年 | 15篇 |
2020年 | 4篇 |
2019年 | 9篇 |
2018年 | 58篇 |
2017年 | 102篇 |
2016年 | 169篇 |
2015年 | 116篇 |
2014年 | 52篇 |
2013年 | 66篇 |
2012年 | 150篇 |
2011年 | 169篇 |
2010年 | 81篇 |
2009年 | 30篇 |
2008年 | 67篇 |
2007年 | 58篇 |
2006年 | 47篇 |
2005年 | 686篇 |
2004年 | 471篇 |
2003年 | 300篇 |
2002年 | 133篇 |
2001年 | 65篇 |
2000年 | 31篇 |
1999年 | 25篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 5篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
排序方式: 共有2945条查询结果,搜索用时 15 毫秒
91.
Andreas Bauer Jan Romberg Bernhard Sch?tz 《Informatik - Forschung und Entwicklung》2005,49(3):194-205
Zur Beherrschung der komplexen vernetzten und verteilten Funktionen von Automotive-Software ist eine Beschreibung des zu erstellenden
Systems auf verschiedenen Abstraktionsebenen und schrittweise überg?nge zwischen diesen Ebenen notwendig. Neben der Definition
geeigneter Ebenen werden zur Unterstützung echtzeitkritischer Systemanteile ein einheitliches Berechnungsmodell, ebenenspezifische
Beschreibungstechniken, sowie methodische Regeln für diese Abstraktionsebenen eingeführt und in den Werkzeugprototypen AutoFocus integriert. 相似文献
92.
Wolfgang Schr?der-Preikschat Daniel Lohmann Fabian Scheler Olaf Spinczyk 《Informatik - Forschung und Entwicklung》2007,22(1):5-22
Design, implementation, and re-engineering of operating systems are still an ambitious undertaking.
Despite, or even because, of the long history of theory and practice in this field, adapting existing systems
to environments of different conditions and requirements as originally specified or assumed, in terms of
functional and/or non-functional respects, is anything but simple. Especially this is true for the embedded
systems domain which, on the one hand, calls for highly specialized and application-aware system abstractions
and, on the other hand, cares a great deal for easily reusable implementations of these abstractions.
The latter aspect becomes more and more important as embedded systems technology is faced with an innovation
cycle decreasing in length. Software for embedded systems needs to be designed for variability, and this
is in particular true for the operating systems of this domain. The paper discusses dimensions of variability
that need to be considered in the development of embedded operating systems and presents approaches that
aid construction and maintenance of evolutionary operating systems.
CR subject classification C.3; D.2.11; D.2.13; D.4.7 相似文献
93.
Elke Achtert Christian B?hm Peer Kr?ger Peter Kunath Alexey Pryakhin Matthias Renz 《Informatik - Forschung und Entwicklung》2007,15(3):179-195
The reverse k-nearest neighbor (RkNN) problem, i.e. finding all objects in a data set the k-nearest
neighbors of which include a specified query object, has received increasing attention recently. Many
industrial and scientific applications call for solutions of the RkNN problem in arbitrary metric spaces
where the data objects are not Euclidean and only a metric distance function is given for specifying
object similarity. Usually, these applications need a solution for the generalized problem where the
value of k is not known in advance and may change from query to query. In addition, many applications
require a fast approximate answer of RkNN-queries. For these scenarios, it is important to generate
a fast answer with high recall. In this paper, we propose the first approach for efficient approximative
RkNN search in arbitrary metric spaces where the value of k is specified at query time. Our approach
uses the advantages of existing metric index structures but proposes to use an approximation of the
nearest-neighbor-distances in order to prune the search space. We show that our method scales significantly
better than existing non-approximative approaches while producing an approximation of the true query
result with a high recall. 相似文献
94.
95.
96.
Edith?MukudiEmail author 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2004,50(5-6):447-461
What happens when a government cannot meet its obligation to provide universal primary education and enhance the quality of education for all of its citizens? The present study examines the interactions among stakeholders in the user-fee policy in primary education in Kenya. It seeks to show how this policy has affected attendance rates and drop-out rates among elementary schoolchildren. It reveals that, in addition to limiting access and contributing to attrition, user-fees significantly contribute to absenteeism. The study also exposes the dire situation of economically vulnerable citizens who do not have the resources which they need to ensure private education for their children. It concludes that together the government and household-level economic weaknesses have made it virtually impossible to attain the goal of education for all in Kenya. 相似文献
97.
98.
99.
100.
Nicol CJ 《Learning & behavior》2004,32(1):72-81
This review highlights two areas of particular interest in the study of social learning in fowl. First, the role of social
learning in the development of feeding and foraging behavior in young chicks and older birds is described. The role of the
hen as a demonstrator and possible teacher is considered, and the subsequent social influence of brood mates and other companions
on food avoidance and food preference learning is discussed. Second, the way in which work on domestic fowl has contributed
to an understanding of the importance of directed social learning is examined. The well-characterized hierarchical social
organization of small chicken flocks has been used to design studies which demonstrate that the probability of social transmission
is strongly influenced by social relationships between birds. The practical implications of understanding the role of social
learning in the spread of injurious behaviors in this economically important species are briefly considered. 相似文献