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   293篇
  免费   6篇
  国内免费   2篇
教育   178篇
科学研究   41篇
各国文化   4篇
体育   38篇
文化理论   5篇
信息传播   35篇
  2024年   1篇
  2022年   3篇
  2021年   8篇
  2020年   2篇
  2019年   8篇
  2018年   9篇
  2017年   6篇
  2016年   9篇
  2015年   8篇
  2014年   7篇
  2013年   56篇
  2012年   12篇
  2011年   10篇
  2010年   8篇
  2009年   12篇
  2008年   17篇
  2007年   10篇
  2006年   4篇
  2005年   7篇
  2004年   3篇
  2003年   8篇
  2002年   6篇
  2001年   5篇
  2000年   3篇
  1999年   3篇
  1998年   4篇
  1997年   4篇
  1996年   3篇
  1995年   2篇
  1994年   8篇
  1993年   5篇
  1992年   4篇
  1991年   5篇
  1990年   7篇
  1989年   1篇
  1988年   5篇
  1987年   2篇
  1986年   3篇
  1985年   6篇
  1983年   2篇
  1982年   1篇
  1981年   4篇
  1979年   1篇
  1977年   1篇
  1974年   1篇
  1973年   2篇
  1960年   1篇
  1943年   2篇
  1847年   2篇
排序方式: 共有301条查询结果,搜索用时 609 毫秒
11.
12.
Who borrows laptop computers in an academic health sciences library? Why do they choose to check out laptops? In a survey, laptop computer users responded that the laptops were used most frequently to do class-related work. Laptops were most often checked out because they could be taken to a quiet area of the library or to where the user had more room to work. The majority of such borrowers were satisfied or very satisfied with the laptops and the service from the library. The majority of those completing the survey were medical school students and graduate students. The circulation of laptop computers at this academic health sciences library is a very successful and popular program.  相似文献   
13.
Abstract

This article discusses the application of digital video to multimedia, and looks at the pros and cons of two different approaches. It also considers the standards of equipment for various uses.  相似文献   
14.
15.
16.

Unlike some pivotal ideas in the history of science, the basic notion of natural selection is remarkably simple and so one might expect most students to easily grasp the basic principles of the Darwinian theory; yet many students nevertheless have difficulty understanding Darwinian evolution. We suggest that misconceptions about natural selection arise from mistaken categorization. Our thesis for explaining students’ failure to understand this concept or evolution in general is not that they necessarily fail to understand individual Darwinian principles; rather, they often fail to understand the ontological features of equilibration processes, of which evolution is one instance. They thus attribute the evolutionary process in general, and natural selection in particular, with event‐like properties. For example, naive students appear to focus on the idea of survival of the fittest, but embed this idea within an event ontology that involves actors struggling to overcome obstacles and achieve goals. Results showed that most naive subjects’ evolutionary explanations reflected an event ontology. Furthermore, event ontology attributes were positively correlated with non‐Darwinian explanations; by contrast, equilibration attributes, when present, were positively correlated with key Darwinian principles. These findings suggest that students would greatly benefit from science instruction that emphasized the underlying ontology of modern evolutionary theory.  相似文献   
17.
18.
Presentation     
  相似文献   
19.
20.
Heart failure (HF) is a frequent chronic disease in elderly people and represents a major health and economic burden. The accurate diagnosis of HF and the identification of high risk patients is mandatory to select the appropriate therapy and care. HF is associated to cardiac remodeling and inflammation and to the release of neurohormones. If natriuretic peptides remain the biomarkers of choice for the diagnosis and the prognosis of HF, several biomarkers related to cardiac remodeling and inflammation are available for testing and may add valuable information for the risk estimation of HF patients and for the selection of the most appropriated therapy. Furthermore, the quest for new efficient biomarkers of cardiac remodeling and inflammation is still ongoing and new candidates have been identified for a potential use in daily clinical practices. However, before their potential translation to routine parameters several challenges ranging form the analytical validation to the cost-effectiveness estimation should be considered.  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