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   314057篇
  免费   15200篇
  国内免费   669篇
耳鼻咽喉   4006篇
儿科学   9934篇
妇产科学   6870篇
基础医学   44395篇
口腔科学   7784篇
临床医学   24566篇
内科学   70296篇
皮肤病学   8849篇
神经病学   27884篇
特种医学   8935篇
外国民族医学   129篇
外科学   39875篇
综合类   1490篇
一般理论   86篇
预防医学   28268篇
眼科学   6055篇
药学   21791篇
中国医学   984篇
肿瘤学   17729篇
  2023年   1699篇
  2022年   2177篇
  2021年   5793篇
  2020年   3312篇
  2019年   6006篇
  2018年   9434篇
  2017年   6271篇
  2016年   6329篇
  2015年   7005篇
  2014年   8339篇
  2013年   12791篇
  2012年   20684篇
  2011年   20888篇
  2010年   10859篇
  2009年   8983篇
  2008年   17688篇
  2007年   18832篇
  2006年   17552篇
  2005年   17508篇
  2004年   16281篇
  2003年   15066篇
  2002年   14282篇
  2001年   8407篇
  2000年   8490篇
  1999年   7520篇
  1998年   1885篇
  1997年   1519篇
  1996年   1363篇
  1995年   1222篇
  1994年   1049篇
  1992年   4116篇
  1991年   3776篇
  1990年   3547篇
  1989年   3182篇
  1988年   2950篇
  1987年   2808篇
  1986年   2678篇
  1985年   2473篇
  1984年   1834篇
  1983年   1543篇
  1979年   1570篇
  1978年   1096篇
  1977年   1008篇
  1975年   1058篇
  1974年   1258篇
  1973年   1267篇
  1972年   1189篇
  1971年   1174篇
  1970年   1119篇
  1969年   1142篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
1.
2.
3.
4.
5.
6.
Objective: To assess the quality of images and video clips of fetal central nervous (CNS) structures obtained by ultrasound and transmitted via tele-ultrasound from Brazil to Australia.

Methods: In this cross-sectional study, 15 normal singleton pregnant women between 20 and 26 weeks were selected. Fetal CNS structures were obtained by images and video clips. The exams were transmitted in real-time using a broadband internet and an inexpensive video streaming device. Four blinded examiners evaluated the quality of the exams using the Likert scale. We calculated the mean, standard deviation, mean difference, and p values were obtained from paired t tests.

Results: The quality of the original video clips was slightly better than that observed by the transmitted video clips; mean difference considering all observers = 0.23 points. In 47/60 comparisons (78.3%; 95% CI?=?66.4–86.9%) the quality of the video clips were judged to be the same. In 182/240 still images (75.8%; 95% CI?=?70.0–80.8%) the scores of transmitted image were considered the same as the original.

Conclusion: We demonstrated that long distance tele-ultrasound transmission of fetal CNS structures using an inexpensive video streaming device provided images of subjective good quality.  相似文献   
7.
8.
9.
10.

Objective

To explore from a gender perspective the association with subjective health of the interaction between education and household arrangements within the framework of social determinants of health placed at the micro and mezzo levels.

Methods

The data comes from the Spanish sample of the European Union Statistics on Income and Living Conditions for 2014. Independent logistic regression models for men and women were run to analyze the association with subjective health of the interaction between education and household arrangements. An additive model was run to assess possible advantages over the interaction approach.

Results

The interaction models show a lower or even no significant effect on health of household arrangements usually negatively associated with health among individuals with high education, displaying specific patterns according to sex.

Conclusions

Health profiles of women and men are more precisely drawn if both social determinants of health are combined. Among the women, the important role was confirmed of both social determinants of health in understanding their health inequalities. Among the men, mainly those with low educational achievement, the interaction revealed that the household was a more meaningful social determinant of health. This could enable the definition of more efficient public policies to reduce health and gender inequalities.  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