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   24821篇
  免费   1390篇
  国内免费   178篇
耳鼻咽喉   343篇
儿科学   461篇
妇产科学   564篇
基础医学   2949篇
口腔科学   848篇
临床医学   1938篇
内科学   6705篇
皮肤病学   454篇
神经病学   2413篇
特种医学   771篇
外科学   3599篇
综合类   95篇
一般理论   9篇
预防医学   1422篇
眼科学   345篇
药学   1613篇
  1篇
中国医学   51篇
肿瘤学   1808篇
  2024年   22篇
  2023年   182篇
  2022年   377篇
  2021年   724篇
  2020年   427篇
  2019年   611篇
  2018年   704篇
  2017年   508篇
  2016年   613篇
  2015年   648篇
  2014年   994篇
  2013年   1254篇
  2012年   1934篇
  2011年   1944篇
  2010年   1131篇
  2009年   998篇
  2008年   1748篇
  2007年   1653篇
  2006年   1549篇
  2005年   1553篇
  2004年   1424篇
  2003年   1311篇
  2002年   1188篇
  2001年   194篇
  2000年   181篇
  1999年   185篇
  1998年   194篇
  1997年   190篇
  1996年   184篇
  1995年   164篇
  1994年   139篇
  1993年   127篇
  1992年   109篇
  1991年   77篇
  1990年   85篇
  1989年   73篇
  1988年   76篇
  1987年   82篇
  1986年   64篇
  1985年   67篇
  1984年   81篇
  1983年   73篇
  1982年   69篇
  1981年   62篇
  1980年   59篇
  1979年   33篇
  1978年   39篇
  1977年   27篇
  1976年   21篇
  1971年   20篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
4.
5.
ObjectiveTo present, the process of development and evaluation of an educational software on the Child Health Handbook proposed for the continuing education of primary care nurses and physicians.MethodsQuantitative study of methodological development. For software development, the following steps were followed: definition of objectives; determination of the target audience; choice of pedagogical and theoretical reference for content; content selection and structuring; software development and evaluation by experts (five nurses and four physicians). All responded to an instrument that included four domains: pedagogical; content; functionality; system presentation and usability. The evaluation criteria were arranged on a Likert-type scale. The percentage of agreement and Content Validity Index were used for the quantitative analysis of the degree of agreement, considering a Content Validity Index cutoff point equal to 0.80.ResultsThe overall agreement index, calculated by the arithmetic mean of the Contents Validity Index of the evaluated domains, was 0.96, with scores ranging from 0.90 to 1.00. The average percentage of agreement of the experts per domain was 92.86%, with lower agreement in the content (80.95%), presentation, and usability (90.48%) domains. 100% of percentage of agreement was observed in the pedagogical and functionality domains among the evaluated specialists.ConclusionThe percentage of agreement, Content Validity Index and overall agreement index of the Child Health Handbook educational software in the context of primary care disclosed the software adequacy as an educational resource for continuing education of primary care nurses and physicians. Considering the assessed dimensions, it can also be used by other health professionals and undergraduate students.  相似文献   
6.
7.
8.
9.
10.
We prospectively evaluated the effectiveness of contrast-enhanced ultrasonography (CEUS) for differentiation of benign versus malignant portal vein thrombosis (PVT). We studied a total of 43 patients with chronic liver disease, hepatocellular carcinoma-suggestive nodules and confirmed PVT, in whom the nature of the PVT was confirmed by follow-up imaging (US, computed tomography and/or magnetic resonance imaging) performed up to 6 mo after CEUS. PVT was assessed by US, Doppler US and CEUS with respect to vessel wall disruption and/or invasion, color Doppler vascularization, pulsed Doppler vascularization pattern and CEUS enhancement and vascularization pattern, and thrombi were classified as benign or malignant based on these findings. Follow-up studies revealed malignant PVT in 22 of the 43 patients (51%) and benign PVT in 21 patients (49%). CEUS findings were consistent with follow-up studies in 41 of the 43 patients (95%), with κ?=?0.903 (p < 0.0001), sensitivity?=?91% and specificity?=?100%, indicating that CEUS can be confidently used to differentiate benign from malignant portal vein thrombosis in the setting of chronic liver disease.  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