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   3595篇
  免费   284篇
  国内免费   7篇
耳鼻咽喉   15篇
儿科学   90篇
妇产科学   75篇
基础医学   372篇
口腔科学   35篇
临床医学   511篇
内科学   652篇
皮肤病学   27篇
神经病学   359篇
特种医学   120篇
外科学   310篇
综合类   34篇
预防医学   575篇
眼科学   65篇
药学   349篇
中国医学   2篇
肿瘤学   295篇
  2023年   12篇
  2022年   29篇
  2021年   92篇
  2020年   51篇
  2019年   80篇
  2018年   87篇
  2017年   65篇
  2016年   71篇
  2015年   88篇
  2014年   113篇
  2013年   172篇
  2012年   238篇
  2011年   296篇
  2010年   143篇
  2009年   144篇
  2008年   257篇
  2007年   251篇
  2006年   232篇
  2005年   227篇
  2004年   224篇
  2003年   203篇
  2002年   195篇
  2001年   38篇
  2000年   32篇
  1999年   42篇
  1998年   31篇
  1997年   42篇
  1996年   24篇
  1995年   30篇
  1994年   21篇
  1993年   16篇
  1992年   29篇
  1991年   30篇
  1990年   21篇
  1989年   23篇
  1988年   26篇
  1987年   19篇
  1986年   18篇
  1985年   17篇
  1984年   18篇
  1983年   8篇
  1982年   15篇
  1981年   15篇
  1980年   12篇
  1979年   9篇
  1977年   8篇
  1972年   8篇
  1971年   6篇
  1969年   9篇
  1962年   5篇
排序方式: 共有3886条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
45.
Background: Although alcohol is the most socially accepted drug, little is known about the classification of alcohol consumers into clusters influencing drinking outcomes. Past research has demonstrated that injury/illness sensitivity predicts health protecting behaviors. Objectives: The present study explored whether alcohol consumers can be classified based on injury/illness sensitivity and intentions to reduce drinking, and whether the identified clusters exhibited meaningful differences in negative affect and drinking levels. Methods: Four-hundred and eighty-six participants (54.3% male; mean [SD] age?=?26.5 [7.2] years) completed online questionnaires between July and October of 2017. Questions were asked pertaining to injury/illness sensitivity, intentions to reduce drinking, negative affect, and heavy drinking behavior. A k-means cluster analysis was performed on illness/injury sensitivity and intentions to reduce drinking scores. We then examined whether clusters varied according to negative affect or drinking variables. Results: The k-means cluster analysis identified four clusters: Insensitive non-internalizers, Insensitive internalizers, Sensitive non-internalizers, and Sensitive internalizers. Sensitive internalizers reported the highest, whereas Insensitive non-internalizers reported the lowest, negative affect. Sensitive internalizers also had the lowest percentage of heavy drinkers. Conclusion/importance: Current findings add to the alcohol literature by indicating that high sensitivity to illnesses/injuries and the internalization of sensitivities via behavior change intentions may provide the best protection against high alcohol consumption levels.  相似文献   
46.
The present study aimed to examine the relationships of insight with symptomatology and executive function, both cross-sectionally and longitudinally in patients with first-episode schizophrenia-spectrum disorders. Ninety-two medication-naïve patients were recruited and 71 completed the assessments. Insight, symptoms and executive function were assessed at baseline, 6 months and 1 year. Insight was measured with the abridged version of Scale of Unawareness of Mental Disorder (SUMD). Symptoms were assessed using the Positive and Negative Syndrome Scale (PANSS). Executive function was measured with the Modified Wisconsin Card Sorting Test (MCST). The most significant improvement of insight and symptomatology was found over the first 6 months, whereas the perseverative errors of MCST were significantly improved between 6 and 12 months. Differential correlations of perseverative errors of the MCST and PANSS scores with SUMD were found at different time points. This suggests the involvement of different mechanisms in insight deficit at different stages of the illness. The baseline MCST perseverative errors were correlated significantly with the SUMD total score at 6 months and the change of SUMD scores over the first 6 months. Although the variance explained was small, it suggests better set-shifting capacity facilitates the improvement of insight at an early stage of the illness.  相似文献   
47.
48.
49.
50.
Objective. Fear of childbirth (FOC) or what is historically referred to as tokophobia (a phobic state where a woman avoids childbirth despite desperately wanting a baby), is known to complicate the delivery process. In this study, the relationship of Anxiety Sensitivity (AS) to FOC was examined given that AS is a risk factor for other fears. Specifically, the contribution of three AS dimensions (physical, psychological or social concerns) relative to other factors (e.g., parity of the mother, trait anxiety) in accounting for FOC was explored.

Methods. Women in their final 4 months of pregnancy (n = 110) completed the Anxiety Sensitivity Index, the State-Trait Anxiety Inventory-Trait Scale and the Wijma Delivery Expectancy/Experience Questionnaire.

Results. Most demographic variables were non-significant in predicting FOC with the exception of participants' parity. Multiple regression analysis revealed that AS-physical concerns significantly predicted elevated FOC even after controlling for parity and trait anxiety; higher levels of AS-physical concerns, higher trait anxiety, and expecting a first child all independently predicted greater FOC.

Conclusion. Variance in FOC is explained, in part, by AS-physical concerns. Further, AS-physical concerns are distinct from trait anxiety in predicting FOC. Similar to other fears, the results support the possibility that AS may be a risk factor for elevated FOC.  相似文献   
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