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   42089篇
  免费   2109篇
  国内免费   152篇
耳鼻咽喉   606篇
儿科学   1134篇
妇产科学   884篇
基础医学   5425篇
口腔科学   2916篇
临床医学   2719篇
内科学   9781篇
皮肤病学   1161篇
神经病学   3805篇
特种医学   1098篇
外国民族医学   1篇
外科学   5068篇
综合类   275篇
一般理论   9篇
预防医学   3812篇
眼科学   938篇
药学   3015篇
中国医学   281篇
肿瘤学   1422篇
  2023年   340篇
  2022年   742篇
  2021年   1434篇
  2020年   796篇
  2019年   1220篇
  2018年   1553篇
  2017年   1000篇
  2016年   1065篇
  2015年   1231篇
  2014年   1635篇
  2013年   2103篇
  2012年   3172篇
  2011年   3407篇
  2010年   1823篇
  2009年   1448篇
  2008年   2561篇
  2007年   2449篇
  2006年   2203篇
  2005年   1986篇
  2004年   1870篇
  2003年   1526篇
  2002年   1470篇
  2001年   962篇
  2000年   975篇
  1999年   768篇
  1998年   264篇
  1997年   210篇
  1996年   190篇
  1995年   152篇
  1994年   150篇
  1993年   121篇
  1992年   320篇
  1991年   316篇
  1990年   294篇
  1989年   248篇
  1988年   262篇
  1987年   225篇
  1986年   180篇
  1985年   182篇
  1984年   130篇
  1983年   121篇
  1982年   63篇
  1981年   71篇
  1980年   70篇
  1979年   116篇
  1978年   81篇
  1975年   72篇
  1974年   59篇
  1971年   60篇
  1967年   67篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
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   
4.
5.

Objective

To discover the experiences of end-of-life patients attended by the emergency services, through the discourse of the family caregivers who accompanied the family member in this care transit.

Method

A qualitative approach study, based on the paradigm of hermeneutical phenomenology. In total, 81 family caregivers participated. The techniques used were the in-depth interview and the discussion group, with a total of 5 discussion groups and 41 interviews. The period of data collection was carried out between January 2013 and June 2014.

Results

In the network of discourses obtained with respect to “Urgent Care”, all the codes were grouped in relation to a single argumentative line: deficiencies in urgent care. Among them, we found different dimensions that are established depending on the different times of care, or the different determinant aspects of these deficiencies: disorganization of the care received, lack of experience of the professionals in emergencies, application of general protocols in the emergency services, inadequate care in the treatment received, delays in emergency care.

Conclusions

In general, we highlight the dissatisfaction of the family members with respect to the care received from the emergency services. The needs of these types of situation are not covered from these services and are of low quality. Therefore, it is necessary to reorient the care protocols for these patients.  相似文献   
6.
7.
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