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   44526篇
  免费   3786篇
  国内免费   423篇
耳鼻咽喉   359篇
儿科学   2361篇
妇产科学   453篇
基础医学   5915篇
口腔科学   593篇
临床医学   4229篇
内科学   2657篇
皮肤病学   254篇
神经病学   16525篇
特种医学   448篇
外科学   1275篇
综合类   4084篇
现状与发展   2篇
一般理论   1篇
预防医学   5040篇
眼科学   135篇
药学   3245篇
  8篇
中国医学   921篇
肿瘤学   230篇
  2024年   56篇
  2023年   998篇
  2022年   1216篇
  2021年   1995篇
  2020年   2021篇
  2019年   1935篇
  2018年   1743篇
  2017年   1868篇
  2016年   1924篇
  2015年   1657篇
  2014年   3010篇
  2013年   4022篇
  2012年   2555篇
  2011年   3082篇
  2010年   2339篇
  2009年   2368篇
  2008年   2496篇
  2007年   2327篇
  2006年   1882篇
  2005年   1465篇
  2004年   1197篇
  2003年   1044篇
  2002年   870篇
  2001年   654篇
  2000年   495篇
  1999年   403篇
  1998年   389篇
  1997年   295篇
  1996年   224篇
  1995年   246篇
  1994年   210篇
  1993年   195篇
  1992年   187篇
  1991年   178篇
  1990年   154篇
  1989年   137篇
  1988年   123篇
  1987年   102篇
  1986年   58篇
  1985年   105篇
  1984年   77篇
  1983年   50篇
  1982年   80篇
  1981年   55篇
  1980年   48篇
  1979年   39篇
  1978年   30篇
  1977年   47篇
  1976年   25篇
  1974年   18篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Major depressive disorder is a serious and common neuropsychiatric disorder that affects more than 350 million people worldwide. Electroconvulsive therapy is the oldest and most effective treatment available for the treatment of severe major depressive disorder. Electroconvulsive therapy modifies structural network changes in patients with major depressive disorder and schizophrenia. And it can also affect neuroinflammatory responses and may have neuroprotective effects. Electroconvulsive therapy plays an irreplaceable role in the treatment of major depressive disorder.  相似文献   
2.
3.
Spondyloepimetaphyseal dysplasias (SEMDs) belong to a clinically and genetically heterogeneous group of inherited skeletal disorders defined by a defect in the growth and shape of vertebrae, epiphyses and metaphyses. Rhizomelic SEMD is characterized by a disproportionate small stature caused by severe shortening and deformation of the limbs’ proximal bones, with the cranio-facial sphere unaffected. We report a second individual, an 8-year-old girl, with autosomal recessive rhizomelic SEMD associated with a homozygous exonic missense variant, c.226G > A p.(Glu76Lys), in GNPNAT1 identified by trio genome sequencing. Our data corroborate the recent findings of Ain et al. and further delineate the clinical and radiographic features of this form of SEMD associated with rhizomelic dysplasia while outlining a potential hotspot in this newly described genetic disorder.  相似文献   
4.
ADHD儿童认知障碍的主要特征之一是执行功能损害,涉及包括前额叶皮层在内的特定脑区域及多层级脑网络异常。执行功能按照功能性分为冷-热两方面:冷执行功能损害主要表现于反应抑制、工作记忆以及认知灵活性等;热执行功能损害通常涉及延迟满足、赏罚相关决策、自我调节及情绪调节等。ADHD儿童的执行功能评估应基于可信范式进行文化适应性调整。临床干预不能单一聚焦于冷执行功能,需关注儿童的身体发育以及热执行功能(情绪社会方面)的发展进程,结合其他共病与心理状况,进行全面的动态随访与干预,以达到最佳的长期疗效。  相似文献   
5.
BackgroundFew studies have investigated the impact of web-based physical activity interventions on mental health outcomes. Therefore, this study examined the impact of a web-based personally tailored physical activity intervention on depression, anxiety, stress and quality of life.Methods501 participants were randomised into either a control group or a pooled intervention condition who received a 3-month web-based personally tailored physical activity intervention. Previously, this intervention has demonstrated to improve self-reported physical activity, but not device-measured physical activity. At baseline, 3- and 9-months, depression, anxiety and stress were assessed using the DASS21, and quality of life was assessed using the SF-12V2. General linear mixed models examined differences between groups over time.ResultsMost participants (>80%) reported normal levels of depression, anxiety or stress. Relative to baseline levels, significant reductions of depression, anxiety, stress and the SF12 mental health component were observed in the pooled intervention group at 3 and 9 months. Relative to the control group, significant reductions were observed in the pooled intervention group for depression and stress (3-months only) and anxiety (3- and 9-months), but not quality of life.ConclusionA web-based physical activity intervention can result in positive mental health outcomes, even in the absence of device-measured physical activity improvements. However, these findings need to be confirmed in future studies.Trial registration numberACTRN12615000057583.  相似文献   
6.
7.
8.
9.
《Radiography》2022,28(2):553-559
IntroductionCOVID-19 is a highly contagious viral disease declared a global pandemic in March 2020. Throughout the pandemic, radiography students have been working in hospitals on the frontline. The review aimed to search for evidence of the impact COVID-19 has had on diagnostic radiography students and consider whether additional support and learning needs to be implemented.MethodsA literature search strategy applied keywords, BOOLEAN search operators, and eligibility criteria on PubMed, Medline, and Google Scholar databases. Cormack's (2000) critique framework was chosen to methodologically appraise the mixed-method studies to evaluate the quality, validity and rigour.ResultsThe search decisions were displayed in a PRISMA flowchart to evidence the process to identify the found articles comprised of two surveys, two semi-structured interviews and one case study. The findings identified common and reoccurring themes of personal protective equipment, mental wellbeing, accommodation and travel, assessments and learning, and transitioning to registration.ConclusionThe literature suggests that students felt positive impacts of the pandemic, such as being prepared for registration. However, negative effects included the fear of contracting the virus, anxieties of working with ill patients, impracticalities of accommodation and travel during clinical placement, and the adaption to online learning.Implications for practiceClinical staff and universities need to work together to ensure students are mentally and physically supported during the pandemic. Regular meetings and agreed channels of communication with students will allow any issues to be brought to attention and addressed. In addition, employers should recognise that newly qualified radiographers will need extra support.  相似文献   
10.
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