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   57428篇
  免费   3047篇
  国内免费   426篇
耳鼻咽喉   599篇
儿科学   1180篇
妇产科学   1539篇
基础医学   6978篇
口腔科学   2144篇
临床医学   4507篇
内科学   15232篇
皮肤病学   1306篇
神经病学   5334篇
特种医学   1693篇
外国民族医学   3篇
外科学   8572篇
综合类   273篇
一般理论   12篇
预防医学   3080篇
眼科学   933篇
药学   3378篇
中国医学   136篇
肿瘤学   4002篇
  2023年   355篇
  2022年   335篇
  2021年   1572篇
  2020年   956篇
  2019年   1349篇
  2018年   1813篇
  2017年   1209篇
  2016年   1371篇
  2015年   1680篇
  2014年   2256篇
  2013年   2897篇
  2012年   4510篇
  2011年   4412篇
  2010年   2502篇
  2009年   2193篇
  2008年   3749篇
  2007年   3816篇
  2006年   3612篇
  2005年   3597篇
  2004年   3249篇
  2003年   2893篇
  2002年   2584篇
  2001年   734篇
  2000年   668篇
  1999年   638篇
  1998年   386篇
  1997年   352篇
  1996年   318篇
  1995年   375篇
  1994年   324篇
  1993年   244篇
  1992年   434篇
  1991年   339篇
  1990年   326篇
  1989年   273篇
  1988年   224篇
  1987年   205篇
  1986年   231篇
  1985年   214篇
  1984年   178篇
  1983年   137篇
  1982年   136篇
  1981年   109篇
  1980年   107篇
  1979年   119篇
  1978年   86篇
  1977年   77篇
  1974年   73篇
  1973年   72篇
  1972年   75篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
11.
Cardiovascular Drugs and Therapy - Major depressive disorder (MDD) and anxiety disorders (AD) are both highly prevalent among individuals with arrhythmia, ischemic heart disease, heart failure,...  相似文献   
12.
Journal of Digital Imaging - Vertebral Compression Fracture (VCF) occurs when the vertebral body partially collapses under the action of compressive forces. Non-traumatic VCFs can be secondary to...  相似文献   
13.
14.
15.
16.
17.
Fitness for working in a policeman being treated for OSAS. A policeman who has been ill with OSAS for 10 years is in optimal CPAP therapy. During this time, the overall assessment of his work activities was excellent and he had no traffic accidents or accidents at work. Concerning his work as a policeman, the Medical Commission of 1st instance considered him unfit to work. Conversely, the Medical Commission of 2nd instance declared him fit to work. In the adult general population, the prevalence of moderate and severe OSAS is more than 20%. It is therefore likely that there are many policemen affected by OSAS and the number of requests for assessments of fitness to work in those with OSAS will increase. It is a priority: (i) to integrate the training course of the medical staff of the Police Forces and the Armed Forces with updates on OSAS; (ii) to delete OSAS from the list of chronic diseases for which night shift work is not indicated.Key words: Obstructive sleep apnea syndrome, fitness for work, public health  相似文献   
18.

Objective

To examine changes in personality in individuals with mild cognitive impairment (MCI) or dementia as observed by family members using both new data and a meta-analysis with the published literature.

Design

Current and retrospective personality assessments of individuals with dementia by family informants. PubMed was searched for studies with a similar design and a forward citation tracking was conducted using Google Scholar in June 2018. Results from a new sample and from published studies were combined in a random effect meta-analysis.

Setting and participants

Family members of older adults with MCI or dementia.

Measures

The 5 major dimensions (neuroticism, extraversion, openness, agreeableness, and conscientiousness) and facets of personality were assessed with NEO Personality Inventory questionnaires.

Results

The new sample (n = 50) and meta-analysis (18 samples; n = 542) found consistent shifts in personality from the premorbid to current state in patients with cognitive impairment. The largest changes (>1 standard deviation) were declines in conscientiousness (particularly for the facets of self-discipline and competence) and extraversion (decreased energy and assertiveness), as well as increases in neuroticism (increased vulnerability to stress). The new sample suggested that personality changes were larger in individuals taking cognition-enhancing medications (cholinesterase inhibitors or memantine). More recent studies and those that examined individuals with MCI found smaller effects.

Conclusions and implications

Consistent with the clinical criteria for the diagnosis of dementia, the new study and meta-analysis found replicable evidence for large changes in personality among individuals with dementia. Future research should examine whether there are different patterns of personality changes across etiologies of dementia to inform differential diagnosis and treatments. Prospective, repeated assessments of personality using both self- and informant-reports are essential to clarify the temporal evolution of personality change across the preclinical, prodromal, and clinical phases of dementia.  相似文献   
19.
20.
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