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   2836篇
  免费   41篇
  国内免费   1篇
教育   2127篇
科学研究   137篇
各国文化   40篇
体育   355篇
综合类   1篇
文化理论   63篇
信息传播   155篇
  2023年   32篇
  2022年   46篇
  2021年   73篇
  2020年   124篇
  2019年   199篇
  2018年   254篇
  2017年   231篇
  2016年   222篇
  2015年   142篇
  2014年   144篇
  2013年   671篇
  2012年   107篇
  2011年   81篇
  2010年   55篇
  2009年   54篇
  2008年   45篇
  2007年   44篇
  2006年   36篇
  2005年   25篇
  2004年   29篇
  2003年   28篇
  2002年   26篇
  2001年   22篇
  2000年   16篇
  1999年   9篇
  1998年   15篇
  1997年   7篇
  1996年   20篇
  1995年   14篇
  1994年   11篇
  1993年   7篇
  1992年   7篇
  1991年   7篇
  1990年   9篇
  1989年   10篇
  1988年   4篇
  1987年   2篇
  1986年   2篇
  1985年   5篇
  1983年   2篇
  1981年   2篇
  1979年   2篇
  1977年   4篇
  1976年   6篇
  1975年   2篇
  1974年   2篇
  1970年   3篇
  1963年   2篇
  1960年   3篇
  1959年   2篇
排序方式: 共有2878条查询结果,搜索用时 15 毫秒
91.
92.
Abstract

Since 1947, distance education in Mexico has had an important role for nonconventional populations. Considering that distance education is a heterogeneous and dynamic field, it is important to reflect on the need to improve quality as measured by our own standards. With that perspective in mind, a national meeting was organized to start a self‐diagnosis in which quality and access were the main concerns. Five hundred and twenty specialists from fifty‐one institutions participated in a national interactive synchronous meeting held in four regions. As a result of the meeting, thirty‐five criteria and 230 parameters of quality were established. The main conclusion of the meeting refers to the need for the elaboration of our own indicators for open and distance education.  相似文献   
93.
94.
95.
96.
This study examined the effect of (a) high- and low-level questions and (b) reading the text before the questions asked on performance, delayed text recall, and deep text comprehension, as well as on specific text-inspection patterns. Participants were 37 undergraduate students who answered either high- or low-level questions using the software Read&Answer to read and answer questions on the computer screen. Additionally, half of the sample read first a text and then answered the questions (reading-first condition), whereas the other half answered the questions without having read the text in advance (no-reading-first condition). All participants had the text available to search for the answer. Results indicated that high-level questions facilitated deep comprehension but not immediate performance or delayed recall of text, independently of the reading condition, and that high- and low-level questions differentially affected text-inspection patterns.  相似文献   
97.
Using the case of FC Barcelona and Catalonia, this paper examines the relationship between national identity, social institutions and political values. Through different methods of qualitative research, we present an intergenerational comparison between age cohorts to capture continuities and discontinuities in the discursive linkage between FC Barcelona and national feelings of belonging. As the context has changed, the identity construction process should have changed in conjunction with it. The results point to how the old cohort tended to use Barça, as an escape valve, intertwined with Catalan nationalism and political freedom. In contrast, the young ones reproduce the old discourse leaving aside those political values formerly attached to the idea of Barça.  相似文献   
98.
The discovery of protein biomarkers that reflect the biological state of the body is of vital importance to disease management. Urine is an ideal source of biomarkers that provides a non-invasive approach to diagnosis, prognosis and prediction of diseases. Consequently, the study of the human urinary proteome has increased dramatically over the last 10 years, with many studies being published. This review focuses on urinary protein biomarkers that have shown potential, in initial studies, for diseases affecting the urogenital tract, specifically chronic kidney disease and prostate cancer, as well as other non-urogenital pathologies such as breast cancer, diabetes, atherosclerosis and osteoarthritis. PubMed was searched for peer-reviewed literature on the subject, published in the last 10 years. The keywords used were “urine, biomarker, protein, and/or prostate cancer/breast cancer/chronic kidney disease/diabetes/atherosclerosis/osteoarthritis”. Original studies on the subject, as well as a small number of reviews, were analysed including the strengths and weaknesses, and we summarized the performance of biomarkers that demonstrated potential. One of the biggest challenges found is that biomarkers are often shared by several pathologies so are not specific to one disease. Therefore, the trend is shifting towards implementing a panel of biomarkers, which may increase specificity. Although there have been many advances in urinary proteomics, these have not resulted in similar advancements in clinical practice due to high costs and the lack of large data sets. In order to translate these potential biomarkers to clinical practice, vigorous validation is needed, with input from industry or large collaborative studies.Key words: urine, protein, biomarker  相似文献   
99.
100.
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