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   152858篇
  免费   6886篇
  国内免费   380篇
耳鼻咽喉   2379篇
儿科学   4569篇
妇产科学   3324篇
基础医学   20581篇
口腔科学   6248篇
临床医学   9411篇
内科学   37339篇
皮肤病学   4769篇
神经病学   12361篇
特种医学   3507篇
外国民族医学   2篇
外科学   18955篇
综合类   836篇
一般理论   41篇
预防医学   14601篇
眼科学   3463篇
药学   10605篇
中国医学   823篇
肿瘤学   6310篇
  2023年   1000篇
  2022年   1128篇
  2021年   3589篇
  2020年   1852篇
  2019年   3682篇
  2018年   5863篇
  2017年   3452篇
  2016年   3343篇
  2015年   3743篇
  2014年   4548篇
  2013年   6509篇
  2012年   11027篇
  2011年   11785篇
  2010年   5999篇
  2009年   4416篇
  2008年   9310篇
  2007年   9770篇
  2006年   8990篇
  2005年   8811篇
  2004年   7897篇
  2003年   7285篇
  2002年   6837篇
  2001年   4420篇
  2000年   5015篇
  1999年   3764篇
  1998年   672篇
  1997年   429篇
  1996年   420篇
  1995年   337篇
  1994年   277篇
  1992年   1480篇
  1991年   1233篇
  1990年   1113篇
  1989年   907篇
  1988年   795篇
  1987年   753篇
  1986年   717篇
  1985年   629篇
  1984年   473篇
  1983年   380篇
  1979年   401篇
  1975年   299篇
  1974年   343篇
  1973年   392篇
  1972年   322篇
  1971年   357篇
  1970年   321篇
  1969年   326篇
  1968年   300篇
  1967年   295篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
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   
32.
Gray platelet syndrome (GPS) is a rare (<1/1 000 000) and inherited platelet function disorder characterized by macrothrombocytopenia, α-granule deficiency, and hemorrhages. Bleeding intensity does not correlate with platelet count nor with functional test results. We hereby describe the perioperative bleeding prevention and management of a patient with GPS requiring multiple redo cardiac surgeries.  相似文献   
33.
34.
35.

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   
36.
37.
38.
39.
40.
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