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   28545篇
  免费   2781篇
  国内免费   41篇
耳鼻咽喉   266篇
儿科学   861篇
妇产科学   805篇
基础医学   3749篇
口腔科学   620篇
临床医学   3244篇
内科学   5502篇
皮肤病学   279篇
神经病学   2295篇
特种医学   905篇
外科学   4524篇
综合类   688篇
一般理论   48篇
预防医学   3293篇
眼科学   455篇
药学   2235篇
中国医学   21篇
肿瘤学   1577篇
  2021年   569篇
  2020年   356篇
  2019年   533篇
  2018年   616篇
  2017年   487篇
  2016年   477篇
  2015年   555篇
  2014年   803篇
  2013年   1136篇
  2012年   1658篇
  2011年   1675篇
  2010年   902篇
  2009年   797篇
  2008年   1324篇
  2007年   1408篇
  2006年   1286篇
  2005年   1359篇
  2004年   1225篇
  2003年   1193篇
  2002年   1078篇
  2001年   722篇
  2000年   747篇
  1999年   693篇
  1998年   329篇
  1997年   270篇
  1996年   286篇
  1995年   255篇
  1994年   214篇
  1993年   210篇
  1992年   515篇
  1991年   554篇
  1990年   520篇
  1989年   478篇
  1988年   417篇
  1987年   444篇
  1986年   413篇
  1985年   392篇
  1984年   358篇
  1983年   296篇
  1982年   196篇
  1981年   199篇
  1980年   152篇
  1979年   242篇
  1978年   206篇
  1977年   199篇
  1976年   179篇
  1974年   237篇
  1973年   223篇
  1972年   159篇
  1970年   171篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
ObjectivesTo fill an empirical gap in the literature by examining changes in quality of care measures occurring when multispecialty clinic systems were acquired by hospital-owned, vertically integrated health care delivery systems in the Twin Cities area.ConclusionsMoving a clinic system into a vertically integrated delivery system resulted in limited increases in quality of care indicators. Caution is warranted when the acquisition causes disruption in referral patterns.  相似文献   
4.
5.
6.
In both adults and children with diabetes, technologies such as continuous subcutaneous insulin infusion using insulin pumps and continuous glucose monitoring can help improve diabetes control, reduce hypoglycaemia and improve quality of life. Access to these technologies in the UK is very variable. Some technologies are recommended by the National Institute for Health and Care Excellence, while others have not been appraised, and new technologies are emerging all the time. Additionally, different guidelines for adults and children further complicate access to diabetes technology in the transition from paediatric to adult care. Against this background, Diabetes UK and NHS England have brought together a multidisciplinary group of experts, including clinicians and people with diabetes, to develop this consensus guideline, combining the different technologies into a common pathway to aid clinical and policy decision‐making. We created a pathway that supports the incremental addition of technology as monotherapy and then dual therapy in the same way that we incrementally add in therapeutic agents to support people with Type 2 diabetes to achieve their personalized glycaemic targets. The pathway emphasizes the importance of structured education, specialist support and appropriate access to psychological therapies, as essential pillars for optimized use of diabetes‐related technology, and recommends the re‐evaluation of its use when the individual is unable either to use the technology appropriately or to achieve the intended outcomes. This pathway is endorsed by UK‐wide clinical and patient associations and we recommend that providers and commissioners use it to ensure the right individual with diabetes has access to the right technology in a timely way to help achieve better outcomes.  相似文献   
7.
8.
Recent work suggests that while voluntary episodic memory declines with age, involuntary episodic memory, which comes to mind spontaneously without intention, remains relatively intact. However, the neurophysiology underlying these differences has yet to be established. The current study used electroencephalography (EEG) to investigate voluntary and involuntary retrieval in older and younger adults. Participants first encoded sounds, half of which were paired with pictures, the other half unpaired. EEG was then recorded as they listened to the sounds, with participants in the involuntary group performing a sound localization cover task, and those in the voluntary group additionally attempting to recall the associated pictures. Participants later reported which sounds brought the paired picture to mind during the localization task. Reaction times on the localization task were slower for voluntary than involuntary retrieval and for paired than unpaired sounds, possibly reflecting increased attentional demands of voluntary retrieval and interference from reactivation of the associated pictures respectively. For the EEG analyses, young adults showed greater alpha event-related desynchronization (ERD) during voluntary than involuntary retrieval at frontal and occipital sites, while older adults showed pronounced alpha ERD regardless of intention. Additionally, older adults showed greater ERD for paired than unpaired sounds at occipital sites, likely reflecting visual reactivation of the associated pictures. Young adults did not show this alpha ERD memory effect. Taken together, these data suggest that involuntary memory is largely preserved with age, but this may be due to older adults' greater recruitment of top-down control even when demand for such control is limited.  相似文献   
9.
10.
The growth of online support groups has led to an expression effects paradigm within the health communication literature. Although religious support expression is characterized as a typical subdimension of emotional support, we argue that in the context of a life-threatening illness, the inclusion of a religious component creates a unique communication process. Using data from an online group for women with breast cancer, we test a theoretical expression effects model. Results demonstrate that for breast cancer patients, religious support expression has distinct effects from general emotional support messages, which highlights the need to further theorize expression effects along these lines.  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