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   12463篇
  免费   1355篇
  国内免费   34篇
耳鼻咽喉   142篇
儿科学   488篇
妇产科学   316篇
基础医学   1679篇
口腔科学   291篇
临床医学   1353篇
内科学   2322篇
皮肤病学   161篇
神经病学   1304篇
特种医学   763篇
外科学   1498篇
综合类   330篇
一般理论   29篇
预防医学   1304篇
眼科学   232篇
药学   861篇
中国医学   4篇
肿瘤学   775篇
  2021年   105篇
  2020年   132篇
  2019年   143篇
  2018年   190篇
  2017年   174篇
  2016年   161篇
  2015年   200篇
  2014年   311篇
  2013年   444篇
  2012年   440篇
  2011年   456篇
  2010年   307篇
  2009年   291篇
  2008年   456篇
  2007年   505篇
  2006年   480篇
  2005年   451篇
  2004年   471篇
  2003年   420篇
  2002年   454篇
  2001年   418篇
  2000年   413篇
  1999年   367篇
  1998年   204篇
  1997年   201篇
  1996年   229篇
  1995年   169篇
  1994年   174篇
  1993年   184篇
  1992年   310篇
  1991年   314篇
  1990年   317篇
  1989年   328篇
  1988年   274篇
  1987年   299篇
  1986年   276篇
  1985年   253篇
  1984年   197篇
  1983年   212篇
  1982年   139篇
  1981年   127篇
  1980年   96篇
  1979年   186篇
  1978年   127篇
  1977年   104篇
  1976年   116篇
  1975年   90篇
  1974年   92篇
  1972年   95篇
  1971年   87篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
Information was collected through the retrospective analysis of records and interview on the characteristics, abilities, challenging behaviours shown and services received by 55 children who attended a behavioural residential special education facility since 1982. Results indicated that, overall, (1) during the mean 2.5 year stay at the facility the children showed significant gains in self-care and communication skills and significant reductions on all indicators of challenging behaviour; (2) that these gains were maintained over the mean 6.5 year follow-up period; but (3) that few additional gains were made during this period. After controlling for initial level of challenging behaviour, greater reductions in challenging behaviour during attendance at the school were observed for children who: prior to entry were living at home; who did not have epilepsy; or who attended the school at a younger age. After leaving school greater improvements were observed by: boys; children who did not have epilepsy; children who were less able; and children who had been followed up for a longer period of time.  相似文献   
43.
Two studies examined the effectiveness of the body-worn alarm in out-patient treatment of childhood nocturnal enuresis. The first involved 40 children, previously untreated by conditioning methods, treated with either the body-worn alarm or the traditional pad and bell alarm. The second study compared the body-worn alarm with modified dry-bed training with 48 children previously resistant to treatment. Results of both studies indicated the body-worn alarm was as effective as other methods in terms of the proportion of children successfully treated and was superior with respect to rapidity of response and consumer appeal. Such findings indicate that the body-worn alarm could become the treatment of choice for nocturnal enuresis.  相似文献   
44.
45.
46.
47.
48.
Combination antiretroviral therapy transformed human immunodefiency virus (HIV)‐infection from a terminal illness to a manageable condition, but these patients remain at a significantly elevated risk of developing cognitive impairments and the mechanisms are not understood. Some previous neuroimaging studies have found hyperactivation in frontoparietal networks of HIV‐infected patients, whereas others reported aberrations restricted to sensory cortices. In this study, we utilize high‐resolution structural and neurophysiological imaging to determine whether alterations in brain structure, function, or both contribute to HIV‐related cognitive impairments. HIV‐infected adults and individually matched controls completed 3‐Tesla structural magnetic resonance imaging (sMRI) and a mechanoreception task during magnetoencephalography (MEG). MEG data were examined using advanced beamforming methods, and sMRI data were analyzed using the latest voxel‐based morphometry methods with DARTEL. We found significantly reduced theta responses in the postcentral gyrus and increased alpha activity in the prefrontal cortices of HIV‐infected patients compared with controls. Patients also had reduced gray matter volume in the postcentral gyrus, parahippocampal gyrus, and other regions. Importantly, reduced gray matter volume in the left postcentral gyrus was spatially coincident with abnormal MEG responses in HIV‐infected patients. Finally, left prefrontal and postcentral gyrus activity was correlated with neuropsychological performance and, when used in conjunction, these two MEG findings had a sensitivity and specificity of over 87.5% for HIV‐associated cognitive impairment. This study is the first to demonstrate abnormally increased activity in association cortices with simultaneously decreased activity in sensory areas. These MEG findings had excellent sensitivity and specificity for HIV‐associated cognitive impairment, and may hold promise as a potential disease marker. Hum Brain Mapp 36:897–910, 2015. © 2014 Wiley Periodicals, Inc.  相似文献   
49.
50.
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