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   2037篇
  免费   21篇
  国内免费   4篇
教育   1497篇
科学研究   186篇
各国文化   21篇
体育   165篇
综合类   12篇
文化理论   38篇
信息传播   143篇
  2023年   5篇
  2022年   25篇
  2021年   45篇
  2020年   53篇
  2019年   94篇
  2018年   121篇
  2017年   119篇
  2016年   86篇
  2015年   61篇
  2014年   72篇
  2013年   321篇
  2012年   69篇
  2011年   58篇
  2010年   68篇
  2009年   45篇
  2008年   49篇
  2007年   49篇
  2006年   43篇
  2005年   72篇
  2004年   74篇
  2003年   96篇
  2002年   72篇
  2001年   65篇
  2000年   37篇
  1999年   22篇
  1998年   8篇
  1997年   6篇
  1996年   9篇
  1995年   16篇
  1994年   10篇
  1993年   6篇
  1992年   6篇
  1991年   12篇
  1990年   7篇
  1989年   13篇
  1986年   5篇
  1985年   7篇
  1984年   4篇
  1983年   4篇
  1982年   8篇
  1981年   6篇
  1980年   7篇
  1978年   6篇
  1977年   7篇
  1975年   4篇
  1974年   8篇
  1973年   6篇
  1967年   4篇
  1966年   6篇
  1963年   6篇
排序方式: 共有2062条查询结果,搜索用时 906 毫秒
151.
152.
153.
During the Cold War, Franco’s dictatorship attempted to use technological transfer and nuclear technology to strengthen the geopolitical influence of his Government in Spain. This paper studies this process, with particular reference to the role played by German scientists as advisers to the Spanish nuclear project.  相似文献   
154.
This special issue contains articles describing XML retrieval approaches developed and evaluated during the second year of INEX, the evaluation initiative for XML retrieval.  相似文献   
155.
156.
Abstract In soccer, critical match events like goal attempts can be preceded by periods of instability in the balance between the two teams' behaviours. Therefore, we determined periods of high variability in the distance between the teams' centroid positions longitudinally and laterally in an international-standard soccer match and evaluated corresponding match events. Position data were collected with AMISCO Pro?. Inter-team distance variability was calculated over a 3-s moving window. Out of the 242 match periods that exceeded the variability criterion, 51 were dead-ball situations. Match events identified through longitudinal inter-team distance primarily related to defending players moving forward-backward after a longitudinal pass. Match events identified through lateral inter-team distance mainly corresponded with defending players moving laterally following sideways passing. One of two goals and two of fourteen goal-attempts were preceded by a period of high variability. Together, periods of highly variable inter-team distance were associated with collective defensive actions and team reorganisation in dead-ball moments rather than goals or goal attempts. Inter-team dynamics quantified (mutual) reorganisation of the teams and marked teams' collective defensive ability to respond to attacking explorations.  相似文献   
157.
Different techniques and tools currently exist to generate three-dimensional models of small elements, buildings and cities. Apart from being easier to interpret than two-dimensional drawings, these models facilitate data necessary for reconstruction projects, preservation or rehabilitation of the architectural or archaeological heritage. Traditional surveying only enables us to obtain discrete information of the characteristic lines that define each surface, edge, slope change etc. whereas work with massive capture techniques allows us to obtain continuous points of the surfaces. Photogrammetry or laser scanning combined with conventional photography provides information of the building in addition to its geometry. We carried out a review of the different techniques showing the advantages and disadvantages of each technique as well as the information that can be obtained by applying these techniques to the survey of the great Gate of Antioch in the town of Aleppo, declared a World Heritage Site by UNESCO in 1986, in Syria.  相似文献   
158.
159.
160.
This article presents an overview of the recent literature on gendered patterns of academic choice in mathematics, science, and technology. It distinguishes in this literature micro-level, macro-level, and institutional explanations. Micro-level explanations focus primarily on psychological constructs, that is, variables at the level of the individual students. Macro-level explanations focus primarily on socioeconomic conditions and cultural understandings of gender roles. Institutional explanations focus on design characteristics of (national) education systems. After a presentation of these perspectives and of recent research progress that has been made, the authors critically discuss the lacunae that still exist in explaining cross-national variety, and provide suggestions for designing future research in this field.  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