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   3010720篇
  免费   236940篇
  国内免费   6134篇
耳鼻咽喉   42956篇
儿科学   95752篇
妇产科学   81735篇
基础医学   426729篇
口腔科学   86956篇
临床医学   275262篇
内科学   583133篇
皮肤病学   63684篇
神经病学   249789篇
特种医学   119222篇
外国民族医学   1131篇
外科学   453175篇
综合类   72402篇
现状与发展   1篇
一般理论   1285篇
预防医学   243886篇
眼科学   71065篇
药学   222996篇
  7篇
中国医学   5724篇
肿瘤学   156904篇
  2018年   31094篇
  2016年   26716篇
  2015年   30047篇
  2014年   42955篇
  2013年   65751篇
  2012年   87975篇
  2011年   92967篇
  2010年   55127篇
  2009年   52506篇
  2008年   87941篇
  2007年   93592篇
  2006年   94601篇
  2005年   91891篇
  2004年   88901篇
  2003年   85688篇
  2002年   84003篇
  2001年   137801篇
  2000年   142605篇
  1999年   120338篇
  1998年   35021篇
  1997年   31764篇
  1996年   31394篇
  1995年   30431篇
  1994年   28573篇
  1993年   26537篇
  1992年   97279篇
  1991年   94303篇
  1990年   91383篇
  1989年   88104篇
  1988年   81403篇
  1987年   80564篇
  1986年   76136篇
  1985年   72971篇
  1984年   55319篇
  1983年   47197篇
  1982年   28793篇
  1981年   25666篇
  1980年   24045篇
  1979年   51998篇
  1978年   36741篇
  1977年   31069篇
  1976年   29293篇
  1975年   30770篇
  1974年   37907篇
  1973年   36071篇
  1972年   33667篇
  1971年   31256篇
  1970年   29212篇
  1969年   27226篇
  1968年   24878篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
93.
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   
94.
95.
96.
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   
97.
98.
99.
100.
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