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   38060篇
  免费   447篇
  国内免费   42篇
教育   27982篇
科学研究   3538篇
各国文化   293篇
体育   2363篇
综合类   35篇
文化理论   613篇
信息传播   3725篇
  2022年   141篇
  2021年   260篇
  2020年   419篇
  2019年   599篇
  2018年   2893篇
  2017年   2890篇
  2016年   2366篇
  2015年   629篇
  2014年   776篇
  2013年   5402篇
  2012年   860篇
  2011年   1456篇
  2010年   1399篇
  2009年   963篇
  2008年   1255篇
  2007年   1716篇
  2006年   579篇
  2005年   850篇
  2004年   895篇
  2003年   758篇
  2002年   580篇
  2001年   485篇
  2000年   472篇
  1999年   464篇
  1998年   246篇
  1997年   296篇
  1996年   298篇
  1995年   264篇
  1994年   260篇
  1993年   235篇
  1992年   348篇
  1991年   372篇
  1990年   379篇
  1989年   356篇
  1988年   326篇
  1987年   298篇
  1986年   300篇
  1985年   375篇
  1984年   314篇
  1983年   309篇
  1982年   239篇
  1981年   245篇
  1980年   207篇
  1979年   285篇
  1978年   264篇
  1977年   234篇
  1976年   190篇
  1975年   160篇
  1974年   143篇
  1973年   174篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Letters     
  相似文献   
3.
Editorial     
B. Sury 《Resonance》2018,23(7):723-725
  相似文献   
4.
Genetic variation in the angiotensin II type 1 receptor (AT1R) has an important effect on the outcome of acute coronary syndrome (ACS) initiated treatment with captopril. This study aims to investigate the impact of genetic polymorphism of AT1R (rs5186 and rs275651) on the ACS outcome in Iraqi patients treated with captopril. A total of 250 Iraqi individuals with ACS were included in this case—control study and they were divided into two study groups; Study group 1 included 125 participants who were prescribed captopril, 25 mg twice daily and study group 2 included 125 participants who received no captopril as part of their ACS treatment (control study). The AT1R gene (rs5186) CC genotype was found to be associated with ST-elevation myocardial infarction (STEMI) (Odd’s ratio (O.R) = 1.2, P = 0.7), while AC was associated with Non-ST-elevation myocardial infarction (NSTEMI) and unstable angina (UA) (O.R = 1.2, P = 0.8). AC genotype is more prone to have Percutaneous coronary intervention (PCI) after ACS attack (O.R = 1.2, P = 0.6). CC genotype had a risk to get less improvement (O.R = 1.6, P = 0.5), so might require higher doses of captopril during acute coronary insult. The AT1R gene (rs275651) AA genotype was associated with UA (O.R = 1.3, P = 0.9). AA and AT genotypes were more prone to have PCI after ACS attack (O.R = 3.9 P = 0.2, O.R = 3.5, P = 0.3 respectively) and thus requiring higher doses of captopril. We conclude that the AT1R rs5186, rs275651 genetic polymorphisms might partially affect the clinical outcome of ACS patients treated with captopril and might have captopril resistance which requires higher doses.  相似文献   
5.
ABSTRACT

For many forcefully displaced people worldwide, notions around one’s sense of “home” and “place” in the world are perpetually unsettled. This article explores how digital technologies interact with embodied, material experiences within the geographical location refugees are residing in. Empirical examples from ethnographic research conducted among Iraqi urban refugees, living in prolonged uncertainty in Jordan, shows how situated experiences of legal, material, and social uncertainty reinforce particular mediated socialities. Pivotal studies have shown how digital connections engender virtual home-making practices and a wide variety of connected presences. This study points to the other side of the same coin: the cultivation of “absent presence.” “Absent presence” refers to feelings—the ambivalence that experiences of prolonged displacement bring about—but also to active disengagement and affective tactics in response. These engender a further separation from the physical world where forced migrants are not deemed welcome.  相似文献   
6.
7.
8.
9.
10.
The emerging creative practices of digital collections are increasing in prominence thanks to the access to, and appeal of, data visualizations. Interactive data visualizations, such as a map, timeline, chart, graph, or artist’s rendering of data, enable users to pursue their own research interests within a collection and participate in new areas of research. Use of these data visualizations enhances the scope of the collection and enables a modern and diverse thematic collection to emerge. This article considers the question: Does the addition of data visualizations affect how users participate with a research collection? Impacts on collection development, application of user-centered design, and analysis of users’ exploratory strategies are discussed. Examples of data visualizations used in digital humanities projects and digital collections are presented as case studies.  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