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   21992篇
  免费   2588篇
  国内免费   64篇
耳鼻咽喉   212篇
儿科学   815篇
妇产科学   560篇
基础医学   3253篇
口腔科学   600篇
临床医学   2520篇
内科学   3842篇
皮肤病学   357篇
神经病学   1582篇
特种医学   916篇
外国民族医学   3篇
外科学   2864篇
综合类   514篇
一般理论   25篇
预防医学   2614篇
眼科学   371篇
药学   1800篇
中国医学   95篇
肿瘤学   1701篇
  2021年   244篇
  2020年   195篇
  2019年   259篇
  2018年   378篇
  2017年   257篇
  2016年   284篇
  2015年   335篇
  2014年   484篇
  2013年   666篇
  2012年   915篇
  2011年   949篇
  2010年   577篇
  2009年   549篇
  2008年   846篇
  2007年   946篇
  2006年   979篇
  2005年   936篇
  2004年   889篇
  2003年   849篇
  2002年   841篇
  2001年   834篇
  2000年   830篇
  1999年   741篇
  1998年   369篇
  1997年   319篇
  1996年   337篇
  1995年   306篇
  1994年   273篇
  1993年   244篇
  1992年   589篇
  1991年   500篇
  1990年   511篇
  1989年   460篇
  1988年   443篇
  1987年   442篇
  1986年   436篇
  1985年   397篇
  1984年   313篇
  1983年   255篇
  1982年   203篇
  1981年   183篇
  1980年   176篇
  1979年   283篇
  1978年   218篇
  1977年   178篇
  1976年   171篇
  1975年   174篇
  1974年   195篇
  1973年   187篇
  1972年   191篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
PROBLEM: Recent developments in providing care to children with emotional and behavioral disorders, especially those with serious emotional disturbance, have included the establishment of systems of care. Guided by a set of principles and values, these systems of care have organized and delivered services to children and families with complex needs. To date, nurses have not had a salient role in systems of care. RESULTS: It is estimated that 20% of American children and adolescents have an emotional or mental disorder. As many as two thirds of these children are not receiving services. Systems of care have been funded to provide services for these children, particularly for the most severely affected. To date, nursing has not had a prominent role in these systems of care. CONCLUSIONS: Based on their knowledge, skills, and holistic approach to care, nurses could better integrate nursing care into systems of care. Possible roles as case managers, primary therapists, in-home interventionists, and in educational programs are suggested.  相似文献   
25.
26.
The Stiff Elbow     
Elbow motion is essential for upper extremity function to position the hand in space. Unfortunately, the elbow joint is prone to stiffness following a multitude of traumatic and atraumatic etiologies. Elbow stiffness can be diagnosed with a complete history and physical exam, supplemented with appropriate imaging studies. The stiff elbow is challenging to treat, and thus, its prevention is of paramount importance. When this approach fails, non-operative followed by operative treatment modalities should be pursued. Upon initial presentation in those who have minimal contractures of 6-month duration or less, static and dynamic splinting, serial casting, continuous passive motion, occupational/physical therapy, and manipulation are non-operative treatment modalities that may be attempted. A stiff elbow that is refractory to non-operative management can be treated surgically, either arthroscopically or open, to eliminate soft tissue or bony blocks to motion. In the future, efforts to prevent and treat elbow stiffness may target the basic science mechanisms involved. Our purpose was to review the etiologies, classification, evaluation, prevention, operative, and non-operative treatment of the stiff elbow.  相似文献   
27.
Hospital surveillance for infection control purposes is a well-accepted method of following nosocomial infections in U.S. hospitals. However, hospital surveillance is being increasingly performed for nosocomial events in noninfectious areas, such as quality assurance and other areas of outcomes research. For the continued development of hospital surveillance in all these areas, dramatic growth in the amount of information collected will occur. To accommodate this growth and to validate new approaches in these areas, large amounts of data collection will be necessary. Collection of these data will be quite difficult without the creation of clinical hospital data bases in which large amounts of information are collected as a routine part of patient care, not as an elaborate addition to patient care. Automated hospital information systems, such as the HELP system, can facilitate the conduct of ongoing hospital surveillance not only in infection control but also in a broad range of areas, such as quality improvement outcomes research and cost-containment areas.  相似文献   
28.
R W Evans  D L Manninen  L P Garrison  A M Maier 《JAMA》1986,255(14):1892-1898
Heart transplantation has now achieved a therapeutic status similar to that of cadaveric renal transplantation. Depending on patient selection criteria, it is estimated that as many as 15,000 people per year could conceivably benefit from a heart transplant, but the actual number of persons who will benefit is severely constrained by donor supply. Availability of heart donors was estimated based on data obtained on 1,955 organ donors in the United States. The results show that because of age and other contraindications, only 400 to 1,100 viable donor hearts may be available each year. Donor supply is the most critical determinant of the future of heart transplantation since it will dictate the number of transplants performed, the survival of transplant recipients, the total program expenditures associated with heart transplantation, the nature of the legal and ethical issues involved, the number of cardiac transplant programs required to make optimal use of the available donor hearts, and the future role of mechanical circulatory support systems.  相似文献   
29.
30.
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