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   6816篇
  免费   528篇
  国内免费   20篇
耳鼻咽喉   37篇
儿科学   220篇
妇产科学   120篇
基础医学   1024篇
口腔科学   229篇
临床医学   618篇
内科学   1265篇
皮肤病学   54篇
神经病学   837篇
特种医学   152篇
外科学   823篇
综合类   75篇
一般理论   14篇
预防医学   715篇
眼科学   136篇
药学   696篇
中国医学   19篇
肿瘤学   330篇
  2023年   44篇
  2022年   47篇
  2021年   146篇
  2020年   97篇
  2019年   119篇
  2018年   157篇
  2017年   117篇
  2016年   122篇
  2015年   168篇
  2014年   241篇
  2013年   341篇
  2012年   472篇
  2011年   508篇
  2010年   285篇
  2009年   292篇
  2008年   435篇
  2007年   464篇
  2006年   458篇
  2005年   480篇
  2004年   461篇
  2003年   405篇
  2002年   418篇
  2001年   78篇
  2000年   55篇
  1999年   83篇
  1998年   88篇
  1997年   70篇
  1996年   59篇
  1995年   52篇
  1994年   36篇
  1993年   45篇
  1992年   39篇
  1991年   40篇
  1990年   43篇
  1989年   33篇
  1988年   32篇
  1987年   17篇
  1986年   32篇
  1985年   20篇
  1984年   30篇
  1983年   31篇
  1982年   25篇
  1981年   33篇
  1980年   20篇
  1979年   20篇
  1978年   16篇
  1977年   11篇
  1976年   7篇
  1975年   8篇
  1969年   8篇
排序方式: 共有7364条查询结果,搜索用时 31 毫秒
1.
2.
Introduction People with intellectual disabilities are now acknowledged to be susceptible to the full range of mental health disorders. This acknowledgement has resulted in the need to develop and evaluate instruments for the assessment and detection of mental health problems. This research evaluates the use of the Brief Symptom Inventory (BSI) with 200 people with mild intellectual disabilities representing community, clinical and forensic populations. Results and conclusions Results illustrate the reliability of the BSI for each of the groups and demonstrates how the Positive Symptom Total (PST) index effectively discriminates between study groups. Case rates for each group are provided. The study illustrates that the BSI could be employed as a brief multitrait assessment instrument and as a treatment outcome measure with people with an intellectual disability.  相似文献   
3.
Anorectal function in the solitary rectal ulcer syndrome   总被引:8,自引:6,他引:2  
The anorectal function of nine patients with solitary rectal ulcer syndrome (SRUS) (5 F: 4 M, median age, 27 (range, 19–41 years) and nine control subjects (5 F: 4 M, median age, 47 (35–66)P<0.01) has been investigated by a new technique that radiologically visualizes the anorectum during voiding of a semisolid contrast medium, while simultaneously measuring intrarectal pressure and anal sphincter EMG activity. A degree of rectal prolapse was demonstrated in eight of the SRUS patients; six of these lesions were clinically occult. Abnormal failure of the anal sphincter to relax on voiding was present in seven of the SRUS patients. These abnormalities resulted in the SRUS patients requiring a greater increase in intrarectal pressure (median, 100 cm water) to void than the control subjects (median, 65 cm water,P<0.01). This combination of high intrarectal pressure and rectal prolapse during straining seems to be the cause of SRUS This work was supported by a grant from the Medical Research Council.  相似文献   
4.
5.
6.
7.
AIM: The aim of this study was to determine the impact of asthma and air pollution on school attendance of primary school children 6 to 12 years of age in Qatar. STUDY DESIGN: This was a cross-sectional population-based study. SUBJECTS: The total 31,400 Qatari school children at the primary school (16,130 boys and 15,270 girls) 6 to 12 of age were studied to investigate school absenteeism caused by asthma and wheezing during the academic year October 2003 to July 2004. METHODS: We have used the School Health Registry for obtaining the student information and school absenteeism due to asthma and wheezing. Again we had double confirmation on the data obtained on asthmatic children by using the modified version of the International Study of Asthma and Allergies in Childhood [ISAAC] questionnaire. RESULTS: A total of 3,270 (10.4%) pupils were diagnosed as having asthma and wheezing. Overall 2,516 (8.02%) pupils were absent from the school for at least one day during the year. There was a statistically significant difference between asthmatic and wheezing students in number of days absent from the school (p < 0.0001). Most absenteeism occurred during spring for both boys (45%) and girls (47%), followed by autumn for boys (33%) and girls (36%). The measured pollutants reached a peak during the spring season and then in autumn of the studied academic year. CONCLUSION: Children with known asthma miss more days of school than those who do not have asthma. This study finding shows that air pollution has an impact on asthma, which results in significant school absenteeism.  相似文献   
8.
9.
10.
HIPDM-Single photon emission computed tomography brain imaging was performed during interictal and ictal stages in three patients with complex partial seizures and secondarily generalized tonic-clonic seizures. In all three patients, interictal studies demonstrated decreased regional cerebral perfusion (rCP) and ictal studies showed increased rCP in the epileptogenic region. The demonstration of focal hyperperfusion by SPECT performed during secondarily generalized tonic-clonic seizures suggests that rCP in the epileptic focus remains higher than in other cerebral regions during immediate postictal stages, even in secondarily generalized seizures.  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