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   733980篇
  免费   43792篇
  国内免费   992篇
耳鼻咽喉   9786篇
儿科学   23452篇
妇产科学   18033篇
基础医学   116624篇
口腔科学   19618篇
临床医学   61972篇
内科学   142192篇
皮肤病学   17944篇
神经病学   56002篇
特种医学   25061篇
外国民族医学   164篇
外科学   104288篇
综合类   9401篇
一般理论   180篇
预防医学   58709篇
眼科学   16445篇
药学   55924篇
中国医学   1670篇
肿瘤学   41299篇
  2021年   6362篇
  2019年   7126篇
  2018年   12000篇
  2017年   8296篇
  2016年   8713篇
  2015年   9729篇
  2014年   11498篇
  2013年   18308篇
  2012年   28249篇
  2011年   29574篇
  2010年   15860篇
  2009年   13407篇
  2008年   26757篇
  2007年   28767篇
  2006年   27807篇
  2005年   27117篇
  2004年   25973篇
  2003年   24318篇
  2002年   23591篇
  2001年   29391篇
  2000年   30477篇
  1999年   25387篇
  1998年   6243篇
  1997年   5379篇
  1996年   5692篇
  1995年   5212篇
  1992年   18581篇
  1991年   18894篇
  1990年   18875篇
  1989年   18044篇
  1988年   16733篇
  1987年   16398篇
  1986年   15469篇
  1985年   14673篇
  1984年   10909篇
  1983年   9311篇
  1982年   5181篇
  1979年   10490篇
  1978年   7628篇
  1977年   6493篇
  1976年   6185篇
  1975年   7131篇
  1974年   8539篇
  1973年   8047篇
  1972年   7805篇
  1971年   7526篇
  1970年   6969篇
  1969年   6712篇
  1968年   6260篇
  1967年   5616篇
排序方式: 共有10000条查询结果,搜索用时 0 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.
Abstract

This study is a single-center, retrospective analysis of postmenopausal women presenting with dyspareunia and vulvar pain, aiming to evaluate relative effectiveness of vestibular CO2 laser therapy as a treatment. Three monthly sessions of laser were performed to each patient and thereafter a three-months follow-up was stablished. A total number of 72 patients undergoing vestibular laser treatment were recruited from patient files in the period between 2016 and 2018. Among these, 39 women also received a concomitant treatment with ospemifene (60?mg/day) during the study period. There was a statistically significant reduction of all the symptoms in both groups up to the three month follow-up. Regarding dryness and dyspareunia, the relief tent to be more prominent in the ospemifene?+?laser group at all follow-ups and remained statistically significant at three-month follow-up. Specifically, vestibular dryness was significantly lower in the ospemifene?+?laser group compared with the laser treatment group (?87% vs???34%, respectively), and the vestibular health score started declining faster in the ospemifene?+?laser group. Although, additional research is needed to understand the mechanism of action, our data shows that a combination regimen of laser and ospemifene may improve clinical effectiveness for long-term treatment of symptoms associated with the under-recognized genitourinary syndrome of menopause.  相似文献   
8.
9.
10.
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