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   92573篇
  免费   29985篇
  国内免费   1058篇
耳鼻咽喉   2372篇
儿科学   2494篇
妇产科学   2265篇
基础医学   1885篇
口腔科学   5068篇
临床医学   25626篇
内科学   23573篇
皮肤病学   3200篇
神经病学   11793篇
特种医学   3489篇
外科学   17295篇
综合类   98篇
现状与发展   40篇
预防医学   12983篇
眼科学   2064篇
药学   811篇
中国医学   5篇
肿瘤学   8555篇
  2024年   540篇
  2023年   5005篇
  2022年   1050篇
  2021年   2610篇
  2020年   5252篇
  2019年   1896篇
  2018年   6753篇
  2017年   7238篇
  2016年   7805篇
  2015年   7883篇
  2014年   10253篇
  2013年   11913篇
  2012年   3378篇
  2011年   3136篇
  2010年   6613篇
  2009年   8930篇
  2008年   3173篇
  2007年   2088篇
  2006年   3283篇
  2005年   1839篇
  2004年   1253篇
  2003年   942篇
  2002年   877篇
  2001年   1792篇
  2000年   1116篇
  1999年   1657篇
  1998年   2043篇
  1997年   1893篇
  1996年   1954篇
  1995年   1685篇
  1994年   1081篇
  1993年   911篇
  1992年   747篇
  1991年   626篇
  1990年   514篇
  1989年   514篇
  1988年   498篇
  1987年   374篇
  1986年   349篇
  1985年   293篇
  1984年   246篇
  1983年   294篇
  1982年   222篇
  1981年   194篇
  1980年   118篇
  1978年   119篇
  1977年   120篇
  1976年   86篇
  1974年   71篇
  1972年   70篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
171.
Society often expects mothers and fathers to share equally in the perinatal grief process because the child was a common bond between them. Unfortunately, in perinatal grief, this is not always the case. The mother and the father can experience incongruent grieving and use discordant coping mechanisms. It is important to evaluate these differences to facilitate communication between the distraught parents. Improved communication can in turn facilitate the grieving process.  相似文献   
172.
173.
174.
175.
The Defense Women's Health Research Initiative commissioned a review of the literature of women's health issues. This was performed and published by the Institute of Medicine. In this publication it was noted that health promotion and disease prevention in women should be an area of high priority for military medicine. This article details some of the ways in which exercise may make substantial contributions to this goal.

The available evidence indicates that there is an inverse association between physical activity and a variety of chronic diseases. Moreover, physical activity appears to influence psychological well-being. Aerobic exercise is the mode most frequently studied, and appears to confer positive changes, but other forms of exercise may prove to be equally beneficial. However, the appropriate duration, intensity, and frequency of the exercise have not been determined for any of these chronic health problems and must be considered before global recommendations can be offered. Efforts to promote physical activity within the community, schools, and homes must be initiated to achieve the goals set forth in Healthy People 2000, so the health of our women can improve. Future studies will be required to identify mechanisms whereby physical activity confers benefit.  相似文献   

176.
177.
178.
TOPIC: The power relations between involuntarily hospitalized adolescents and their caregivers from the viewpoint of theory development in nursing and the concept of medicalization. PURPOSE: To contribute to the development of nursing theories that can guide nursing care of involuntarily hospitalized adolescents by examining the power relations between the adolescents and their caregivers. SOURCES: Published literature in medical sociology, and nursing and psychiatric ethics. Nursing and psychiatric literature, in which Michel Foucault's theories are used to explicate the disciplinary power of psychiatry. CONCLUSIONS: To empower involuntarily hospitalized adolescents nurses must both recognize the inevitable power imbalance and seek guidance from the egalitarian ideals of nursing. Nurses can draw from postmodern thinkers who dismiss the idea that one theory can explain human relationships.  相似文献   
179.
Cough and paradoxical vocal fold motion   总被引:8,自引:0,他引:8  
OBJECTIVES: The differential diagnosis and treatment of patients with chronic cough, paradoxical vocal fold motion, and disordered breathing can be a challenge to most practicing otolaryngologists. Tracheobronchial (ie, asthma, bronchitis, and tracheal stenosis), laryngeal (ie, vocal fold paralysis and neoplasms), and rhinologic (ie, allergies and rhinosinusitis) etiologies are commonly diagnosed and treated effectively. However, occasionally one is faced with patients who are refractory to medical treatment and have no obvious rhinologic, laryngeal or pulmonary cause. STUDY DESIGN AND SETTING: We conducted a review of the literature. METHODS: We present a thorough review of the current medical literature exploring the complex neurologic mechanisms involved in the production of cough and the relationship between gastroesophageal reflux disease, vagal neurapathy, and paradoxical vocal fold motion. RESULTS: The diagnosis and successful treatment of chronic cough can be complex. It requires a thorough understanding of the neurologic mechanisms behind cough excitation and suppression. Successful treatment strategies include aggressive management of the patient's reactive airway disease, gastroesophageal reflux disease, and, in select cases, paradoxical vocal fold motion. This may involve a well-coordinated effort among pulmonologists, otolaryngologists, gastroenterologists, and speech pathologists. CONCLUSION: Gastroesophageal reflux disease, vagal neuropathy, and paradoxical vocal fold motion are additional causes of chronic cough and disordered breathing that need to be considered, in the absence of obvious laryngotracheal and/or rhinologic pathology. A high index of suspicion is essential in making the diagnosis and formulating an effective multidisciplinary treatment plan for these patients.  相似文献   
180.
Automated microplate blood-grouping systems rely on a pair of thresholds to determine whether reactions are positive or negative. The determination of these thresholds is a critical step in the quality control process for automated microplate blood grouping. A simple method has been developed for automatically setting these thresholds. A more sophisticated method, which required substantial computational complexity, was also tried. The more complex method did not perform better than the simple method described here.  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