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   12019篇
  免费   6篇
教育   9246篇
科学研究   1251篇
各国文化   7篇
体育   370篇
文化理论   406篇
信息传播   745篇
  2021年   5篇
  2020年   13篇
  2019年   15篇
  2018年   2184篇
  2017年   2092篇
  2016年   1575篇
  2015年   118篇
  2014年   124篇
  2013年   209篇
  2012年   224篇
  2011年   700篇
  2010年   836篇
  2009年   438篇
  2008年   640篇
  2007年   1155篇
  2006年   77篇
  2005年   401篇
  2004年   455篇
  2003年   369篇
  2002年   145篇
  2001年   18篇
  2000年   29篇
  1999年   14篇
  1998年   9篇
  1997年   22篇
  1996年   9篇
  1994年   7篇
  1993年   3篇
  1992年   4篇
  1991年   13篇
  1990年   3篇
  1989年   8篇
  1987年   4篇
  1985年   5篇
  1984年   7篇
  1983年   8篇
  1982年   5篇
  1981年   6篇
  1980年   7篇
  1979年   5篇
  1978年   2篇
  1977年   10篇
  1976年   4篇
  1975年   2篇
  1974年   5篇
  1973年   5篇
  1971年   4篇
  1967年   4篇
  1966年   4篇
  1943年   2篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Collaborative Filtering (CF) Systems have been studied extensively for more than a decade to confront the “information overload” problem. Nearest-neighbor CF is based either on similarities between users or between items, to form a neighborhood of users or items, respectively. Recent research has tried to combine the two aforementioned approaches to improve effectiveness. Traditional clustering approaches (k-means or hierarchical clustering) has been also used to speed up the recommendation process. In this paper, we use biclustering to disclose this duality between users and items, by grouping them in both dimensions simultaneously. We propose a novel nearest-biclusters algorithm, which uses a new similarity measure that achieves partial matching of users’ preferences. We apply nearest-biclusters in combination with two different types of biclustering algorithms—Bimax and xMotif—for constant and coherent biclustering, respectively. Extensive performance evaluation results in three real-life data sets are provided, which show that the proposed method improves substantially the performance of the CF process.
Yannis ManolopoulosEmail:
  相似文献   
992.
This article addresses the trajectory of Archival Science in Brazil, its extracurricular characteristics and its particular relationship with Information Science within academics, its institutional associations, and some considerations regarding current training for archivists in Brazil. The methodological procedures used included analyzing documents from the National Archive Fonds of Brazil, reviewing archive literature, and interviewing people involved in consolidating Archival Science. This study concludes that Archival Science research is taking place in graduate programs throughout public Brazilian universities and points out that people working with archives now have more advanced training, such as undergraduate degrees in Archival Science or other. This study also focuses on archives as information units, while presenting and reflecting on the demands of training archivists who are faced with the challenges of the working world and the era of information and knowledge—challenges that go beyond merely technical procedures and encompass dynamic planning and orientation activities.  相似文献   
993.
A compressed full-text self-index for a text T, of size u, is a data structure used to search for patterns P, of size m, in T, that requires reduced space, i.e. space that depends on the empirical entropy (H k or H 0) of T, and is, furthermore, able to reproduce any substring of T. In this paper we present a new compressed self-index able to locate the occurrences of P in O((m + occ)log u) time, where occ is the number of occurrences. The fundamental improvement over previous LZ78 based indexes is the reduction of the search time dependency on m from O(m 2) to O(m). To achieve this result we point out the main obstacle to linear time algorithms based on LZ78 data compression and expose and explore the nature of a recurrent structure in LZ-indexes, the suffix tree. We show that our method is very competitive in practice by comparing it against other state of the art compressed indexes.
Arlindo L. OliveiraEmail:
  相似文献   
994.
Play is an important activity in young children’s lives. It is how children explore their world and build knowledge. Although free play, which is play that is totally child directed, contributes to children’s learning, self-regulation and motivation, adults’ participation in children’s play is critical in their development, especially their language development. Guided by children, adults can help scaffold children’s language, and especially their learning. We suggest that adults scaffold children’s language during play by using research based strategies such as asking questions that invite extended responses and new inquiry, provide meaningful feedback and effectively use wait time, which provides children with the opportunity to respond to adults’ comments and questions. The goal is to provide adults with strategies to scaffold children’s language development during play while allowing children to direct their own play activities.  相似文献   
995.
During the last two decades counselling in a multicultural context has been on the increase with more and more training programmes now including issues of race, culture and ethnicity. This has led to numerous approaches, for example transcultural, inter-cultural, cross-cultural, multicultural, Afro-centric, anti-racist and black feminist, which define counselling with minority groups. Although many of these approaches have a sound theoretical base, they nevertheless remain marginal in terms of convincing the minority communities of their value and effectiveness. This is clearly seen in the pre-mature termination and lack of participation by minorities in counselling and therapy. The chief criticism against counselling throughout this period is that, it has remained essentially, Eurocentric, ethnocentric and individualistic. Culture-sensitive counsellors and counselling within a "culture fit" model have been suggested as a way of making the process more appropriate to a diversity of cultures. Furthermore, this has led to some practitioners strongly advocating the inclusion of socio-economic and political constructs as part of a broader definition of multicultural counselling. For example, the issues of power and influence, cultural hegemony, racism and masculinities are becoming key schemas in cross cultural counselling practices. The challenge for multicultural counselling, in the next decade, would be to include traditional healing practices as part of its discourse, if it is to encourage the active participation of ethnicminorities. This paper is an attempt to explore some of these challenges and highlight some of the transformations that are taking place within multicultural counselling. Finally, through a discussion of a case vignette, the paper illustrates the need to accommodate traditional healing methods in counselling the culturally diverse client.  相似文献   
996.
Despite the importance of early writing development to children’s school success, research documents that early childhood teachers spend little time actively supporting children’s writing development in preschool classrooms. This article provides a framework for integrating writing experiences across the early childhood curriculum. Practical examples are given regarding how writing opportunities can be incorporated into existing activities and play settings. The metaphor of backgrounding and foregrounding writing experiences is used to illustrate ways that teachers can set writing rich environments and activities in a manner that makes it easier for teachers to bring these experiences into everyday learning opportunities. Attention is given to how teachers can bring writing to the foreground of the curriculum by drawing attention to writing materials, making natural connections with children’s interest and play, and scaffolding children’s early writing attempts and experiences.  相似文献   
997.
998.
999.
Gary Ruvkun is a winner of the 2015 Breakthrough Prize in Life Sciences. He is a co-discoverer of microRNAs (with Victor Ambros, University of Massachusetts), regarded as one of the seminal discoveries of 21st century molecular biology. In addition to the Breakthrough Prize, Ruvkun and Ambros have received the Warren Triennial Prize, the Laskar Foundation Award, and numerous other awards and prizes. Professor Ruvkun obtained his PhD from Harvard University, did his postdoctoral research at MIT, and subsequently accepted a faculty position at Harvard, where he is currently Professor of Genetics. His laboratory conducts research on basic cellular processes, using the worm C. elegans as a model system.  相似文献   
1000.
V Rajaraman 《Resonance》2017,22(12):1175-1192
Multi-core microprocessor is an interconnected set of independent processors called cores integrated on a single silicon chip. These processing cores communicate and cooperate with one another to execute one or more programs faster than a single core processor. In this article we describe how and why these types of processors evolved. We also describe the basics of how multi-core microprocessors are programmed.  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