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   525174篇
  免费   32599篇
  国内免费   1377篇
耳鼻咽喉   6695篇
儿科学   16148篇
妇产科学   14542篇
基础医学   73652篇
口腔科学   11767篇
临床医学   47726篇
内科学   103885篇
皮肤病学   9495篇
神经病学   44153篇
特种医学   21457篇
外国民族医学   56篇
外科学   83020篇
综合类   10245篇
现状与发展   2篇
一般理论   337篇
预防医学   36058篇
眼科学   12322篇
药学   36063篇
  1篇
中国医学   1100篇
肿瘤学   30426篇
  2021年   7390篇
  2020年   4338篇
  2019年   7180篇
  2018年   9529篇
  2017年   6969篇
  2016年   7789篇
  2015年   9048篇
  2014年   12701篇
  2013年   18184篇
  2012年   25922篇
  2011年   27037篇
  2010年   15957篇
  2009年   14671篇
  2008年   24211篇
  2007年   25844篇
  2006年   25217篇
  2005年   24702篇
  2004年   23500篇
  2003年   21707篇
  2002年   20716篇
  2001年   15248篇
  2000年   15076篇
  1999年   13408篇
  1998年   5757篇
  1997年   4957篇
  1996年   4524篇
  1995年   4278篇
  1994年   3844篇
  1993年   3679篇
  1992年   9287篇
  1991年   9373篇
  1990年   9051篇
  1989年   8821篇
  1988年   7990篇
  1987年   7697篇
  1986年   7355篇
  1985年   7201篇
  1984年   5664篇
  1983年   4893篇
  1982年   3489篇
  1981年   3010篇
  1979年   4891篇
  1978年   3744篇
  1977年   3176篇
  1975年   3149篇
  1974年   3669篇
  1973年   3625篇
  1972年   3299篇
  1971年   3111篇
  1970年   2943篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.

Background

A history of childhood maltreatment and psychopathology are common in adults with obesity.

Objectives

To report childhood maltreatment and to evaluate associations between severity and type of childhood maltreatment and lifetime history of psychopathology among adults with severe obesity awaiting bariatric surgery.

Setting

Four clinical centers of the Longitudinal Assessment of Bariatric Surgery Research Consortium.

Methods

The Childhood Trauma Questionnaire, which assesses presence/severity (i.e., none, mild, moderate, severe) of physical abuse, mental abuse, physical neglect, mental neglect, and sexual abuse, was completed by 302 female and 66 male bariatric surgery patients. Presurgery lifetime history of psychopathology and suicidal ideation/behavior were assessed with the Structured Clinical Interview for DSM-IV and the Suicidal Behavioral Questionnaire-Revised, respectively. Presurgery lifetime history of antidepressant use was self-reported.

Results

Two thirds (66.6%) of females and 47.0% of males reported at least 1 form of childhood trauma; 42.4% and 24.2%, respectively, at greater than or equal to moderate severity. Among women, presence/greater severity of childhood mental or physical abuse or neglect was associated with a higher risk of history of psychopathology (i.e., major depressive disorder, posttraumatic stress disorder, other anxiety disorder, alcohol use disorder, binge eating disorder), suicidal ideation/behavior and antidepressant use (P for all ≤ .02). These associations were independent of age, race, education, body mass index, and childhood sexual abuse. Childhood sexual abuse was independently associated with a history of suicidal ideation/behavior and antidepressant use only (P for both ≤ .05). Statistical power was limited to evaluate these associations among men.

Conclusion

Among women with obesity, presence/severity of childhood trauma was positively associated with relatively common psychiatric disorders.  相似文献   
93.
94.
95.
96.
97.
98.
99.
Theory: Immersive simulation is a common mode of education for medical students. Observation of clinical simulations prior to participation is believed to be beneficial, though this is often a passive process. Active observation may be more beneficial. Hypotheses: The hypothesis tested in this study was that the active use of a simple checklist during observation of an immersive simulation would result in better participant performance in a subsequent scenario compared with passive observation alone. Methods: Medical students were randomized to either passive or active (with checklist) observation of an immersive simulation involving cardiac arrest prior to participating in their own simulation. Performance measures included time to cardiopulmonary resuscitation (CPR) and time to defibrillation and were compared between first and second scenarios as well as between passive and active observers. Results: Seventy-nine simulations involving 232 students were conducted. Mean time to CPR was 18 seconds (SD = 11.6) for those using the checklist and 24 seconds (SD = 15.8) for those who observed passively (M difference = 6 seconds), t(35) = 1.46, p =.153. Time to defibrillation was 94 seconds (SD = 26.4) for those using the checklist and 92 seconds (SD = 23.8) for those who observed passively (M difference = –2 seconds), t(38) =.21, p =.837. Time to CPR was 24 seconds (SD = 15.8) for passive observers and 31 seconds (SD = 21.0; M difference = 7 seconds), t(35) = 1.13, p =.265, for their first scenario counterparts. Time to CPR was 18 seconds (SD = 11.6) for active observers and 36 seconds (SD = 26.2; M difference = 18 seconds), t(24) = 2.81, p =.010, for their first scenario counterparts. Time to defibrillation was 92 seconds (SD = 23.8) for passive observers and 125 seconds (SD = 32.2; M difference = 33 seconds), t(33) = 3.63, p =.001, for their first scenario counterparts. Time to defibrillation was 94 seconds (SD = 26.4) for the active observers and 132 seconds (SD = 52.9; M difference = 38 seconds), t(28) =.46, p =.008, for their first scenario counterparts. Conclusions: Observation alone leads to improved performance in the management of a simulated cardiac arrest. The active use of a simple skills-based checklist during observation did not appear to improve performance over passive observation alone.  相似文献   
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