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   2065227篇
  免费   156470篇
  国内免费   3917篇
耳鼻咽喉   27291篇
儿科学   69295篇
妇产科学   58218篇
基础医学   304619篇
口腔科学   58254篇
临床医学   191451篇
内科学   399362篇
皮肤病学   45688篇
神经病学   165436篇
特种医学   77993篇
外国民族医学   554篇
外科学   299343篇
综合类   46209篇
现状与发展   3篇
一般理论   919篇
预防医学   168744篇
眼科学   47130篇
药学   150606篇
  9篇
中国医学   3786篇
肿瘤学   110704篇
  2018年   21863篇
  2017年   16828篇
  2016年   18765篇
  2015年   21463篇
  2014年   29609篇
  2013年   45434篇
  2012年   60837篇
  2011年   64976篇
  2010年   38149篇
  2009年   36329篇
  2008年   60906篇
  2007年   65043篇
  2006年   65015篇
  2005年   63140篇
  2004年   61090篇
  2003年   58685篇
  2002年   56794篇
  2001年   91930篇
  2000年   94075篇
  1999年   79221篇
  1998年   22498篇
  1997年   20434篇
  1996年   20751篇
  1995年   19802篇
  1994年   18398篇
  1993年   17198篇
  1992年   63471篇
  1991年   62318篇
  1990年   61008篇
  1989年   58945篇
  1988年   54102篇
  1987年   53756篇
  1986年   50809篇
  1985年   48506篇
  1984年   36791篇
  1983年   31698篇
  1982年   18965篇
  1981年   17156篇
  1979年   34609篇
  1978年   25310篇
  1977年   21242篇
  1976年   19930篇
  1975年   21255篇
  1974年   25830篇
  1973年   25168篇
  1972年   23631篇
  1971年   21993篇
  1970年   20632篇
  1969年   19360篇
  1968年   18005篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
231.
232.
233.
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   
234.
235.
236.
Patients have become increasingly well informed with higher expectations to be involved in decision-making processes regarding their care and treatment. However, few studies have examined the impact of patient involvement on health care providers’ partnership-building communication. The aim of this study was to measure and explore the self-reported effects of patient involvement on the work of physicians and nurses. A questionnaire survey was distributed among cardiology staff in 12 Swedish hospitals (N = 488, response rate 67%). The sample was comprised of registered nurses (RNs, n = 303), licensed practical nurses (LPNs, n = 132), and physicians (MDs, n = 53). Confirmatory factor analysis was used to examine seven questionnaire statements concerning implications of patient involvement for one’s clinical work. Regression analyses were used to examine factors associated with staff’s partnership-building communication. Analysis confirmed two distinct factors accounting for 57% of the total variance, representing both negative—“Hassles”and positive—“Uplifts”aspects of patient involvement. Regression analyses revealed that only positive aspects (i.e., uplifts) of patient involvement predicted staff behavior aimed at involving patients. Working with actively involved patients may be a source of stress, both negative and positive, for health care professionals. By developing work routines for involving patients in their care, health care workplaces may help health care professionals to buffer the negative effects, and enhance the positive effects, of that stress.  相似文献   
237.
238.
239.
The special interest group on sensitive skin of the International Forum for the Study of Itch previously defined sensitive skin as a syndrome defined by the occurrence of unpleasant sensations (stinging, burning, pain, pruritus and tingling sensations) in response to stimuli that normally should not provoke such sensations. This additional paper focuses on the pathophysiology and the management of sensitive skin. Sensitive skin is not an immunological disorder but is related to alterations of the skin nervous system. Skin barrier abnormalities are frequently associated, but there is no cause and direct relationship. Further studies are needed to better understand the pathophysiology of sensitive skin – as well as the inducing factors. Avoidance of possible triggering factors and the use of well-tolerated cosmetics, especially those containing inhibitors of unpleasant sensations, might be suggested for patients with sensitive skin. The role of psychosocial factors, such as stress or negative expectations, might be relevant for subgroups of patients. To date, there is no clinical trial supporting the use of topical or systemic drugs in sensitive skin. The published data are not sufficient to reach a consensus on sensitive skin management. In general, patients with sensitive skin require a personalized approach, taking into account various biomedical, neural and psychosocial factors affecting sensitive skin.  相似文献   
240.
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