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   2057篇
  免费   155篇
  国内免费   8篇
耳鼻咽喉   10篇
儿科学   63篇
妇产科学   33篇
基础医学   185篇
口腔科学   22篇
临床医学   231篇
内科学   447篇
皮肤病学   19篇
神经病学   173篇
特种医学   110篇
外科学   356篇
综合类   42篇
预防医学   243篇
眼科学   47篇
药学   109篇
  2篇
肿瘤学   128篇
  2023年   13篇
  2021年   28篇
  2020年   24篇
  2019年   37篇
  2018年   52篇
  2017年   21篇
  2016年   25篇
  2015年   43篇
  2014年   45篇
  2013年   87篇
  2012年   78篇
  2011年   80篇
  2010年   55篇
  2009年   56篇
  2008年   64篇
  2007年   86篇
  2006年   74篇
  2005年   70篇
  2004年   68篇
  2003年   66篇
  2002年   71篇
  2001年   69篇
  2000年   56篇
  1999年   67篇
  1998年   38篇
  1997年   40篇
  1996年   32篇
  1995年   27篇
  1994年   28篇
  1993年   22篇
  1992年   54篇
  1991年   43篇
  1990年   59篇
  1989年   48篇
  1988年   52篇
  1987年   40篇
  1986年   43篇
  1985年   40篇
  1984年   21篇
  1983年   28篇
  1982年   14篇
  1980年   15篇
  1979年   39篇
  1978年   20篇
  1977年   32篇
  1976年   21篇
  1975年   17篇
  1973年   17篇
  1972年   13篇
  1971年   14篇
排序方式: 共有2220条查询结果,搜索用时 0 毫秒
41.
42.
43.
The purpose of this article is to outline the criticality of water supply in sustained operations of healthcare facilities, particularly during community emergencies, and to advocate for enhanced cross‐sector support from the water utilities in meeting this need. Information and ideas presented here were developed in the course of a regional project sponsored by the Metropolitan Washington Council of Governments (MWCOG) for development of emergency water supply operations plans for critical water uses in the Washington, DC, area.  相似文献   
44.
45.
The purpose of this study was to determine a profile for predicting attrition among older adults involved in a 12-month exercise program. The parent study was a single-blinded randomized controlled trial. The study took place between 2006 and 2009 within a university setting. Older adults (N?=?179) completed baseline assessments of functional performance and psychosocial measures. Participants who were randomized, elected to receive treatment, and did not complete the exercise program were considered “dropouts” (n?=?35). Those who completed the program (n?=?144) were classified as “completers.” A latent profile analysis revealed two distinct patterns of memory complaints, self-efficacy to overcome barriers to exercise, balance performance, and stair performance. Dropouts were nearly twice as likely to be members of the profile that exhibited a higher degree of memory complaints, lower self-efficacy for overcoming exercise barriers, poorer single leg balance, and longer times to walk down stairs. The results provide an initial validation of a profile for discriminating between “dropouts” and “completers,” one that may have considerable utility for screening older adults prior to study entry.  相似文献   
46.
The natural history of functional morbidity in hospitalized older patients   总被引:7,自引:1,他引:7  
This study provides data on changes in the functional status of older patients that are associated with acute hospitalization. Seventy-one patients over the age of 74 admitted to the medical service of Stanford University Hospital between February and May 1987 received functional assessments covering seven domains: mobility, transfer, toileting, incontinence, feeding, grooming, and mental status. Assessments were obtained by report from the patient's caregiver (or the patient when he or she lived alone) for 2 weeks before admission; from the patient's nurse on day 2 of hospitalization and on the day before discharge; and again from the caregiver (or patient) 1 week after discharge. The sample had a mean age of 84, covered 37 Diagnostic Related Groups, and had a median length of stay of 8 days. Between baseline and day 2, statistically significant deteriorations occurred for the overall functional score and for the individual scores for mobility, transfer, toileting, feeding, and grooming. None of these scores improved significantly by discharge. In the case of mobility, 65% of the patients experienced a decline in score between baseline and day 2. Between day 2 and discharge, 67% showed no improvement, and another 10% deteriorated further. These data suggest that older patients may experience a burden of new and worsened functional impairment during hospitalization that improves at a much slower rate than the acute illness. An awareness of delayed functional recovery should influence discharge planning for older patients. Greater efforts to prevent functional decline in the hospitalized older patient may be warranted.  相似文献   
47.
Pineal indoles have been shown to affect the release of anterior pituitary hormones but details of the interrelationships are lacking. Using a new gas chromatography-mass spectrometry (g.c.-m.s.) assay the concentration of 5-methoxytryptophol (ML) was measured in plasma samples obtained from 16 children undergoing investigation of pituitary function for delayed growth. All the children received an insulin tolerance test (ITT) to study their endocrine response to stress. Some children received luteinizing hormone releasing hormone (LH-RH) and/or thyrotrophin releasing hormone (TRH). The change in concentration of ML during an ITT was similar to the change in concentration of blood sugar; a drop at 20 min followed by a rise at 30 min. This was not significantly altered by the administration of LH-RH or TRH, nor was there a different pattern of response in children who were deficient in growth hormone as opposed to those with idiopathic delayed growth. The fall in concentration of ML with stress may mediate the increased secretion of pituitary hormones. Alternatively, the pineal gland may respond directly to insulin.  相似文献   
48.
Objective. To examine available data and actions surrounding current pharmacy workforce issues in the United States and United Kingdom.Methods. Published pharmacy workforce data from the United States and United Kingdom were gathered from various sources, including PUBMED, Internet search engines, and pharmacy organization websites. Data was collated from additional sources including scientific literature, internal documents, news releases, and policy positions.Results. The number of colleges and schools of pharmacy has expanded by approximately 50% in both the United States and United Kingdom over the previous decade. In the United States, continued demand for the pharmacy workforce has been forecasted, but this need is based on outdated supply figures and assumptions for economic recovery. In the United Kingdom, workforce modeling has predicted a significant future oversupply of pharmacists, and action within the profession has attempted to address the situation through educational planning and regulation.Conclusion. Workforce planning is an essential task for sustaining a healthy profession. Recent workforce planning mechanisms in the United Kingdom may provide guidance for renewed efforts within the profession in the United States.  相似文献   
49.
OBJECTIVE: The objective was to evaluate the effect of a clinic-based intervention program on mammography use by inner-city women. DESIGN: A randomized controlled trial employing firm system methodology was conducted. SETTING: The study setting was a general internal medicine clinic in the university-affiliated county hospital serving metropolitan Seattle. PARTICIPANTS: Women aged 50 to 74 years with at least one routine clinic appointment (when they were due for mammography) during the study period were enrolled in the trial (n = 314). INTERVENTIONS: The intervention program emphasized nursing involvement and included physician education, provider prompts, use of audiovisual and printed patient education materials, transportation assistance in the form of bus passes, preappointment telephone or postcard reminders, and rescheduling assistance. Control firm women received usual care. MEASUREMENTS AND MAIN RESULTS: Mammography completion within 8 weeks of clinic visits was significantly higher among intervention (49%) than control (22%) firm women (p < .001). These effects persisted after adjustment for potential confounding by age, race, medical insurance coverage, and previous mammography experience at the hospital (odds ratio 3.5; 95% confidence interval 1.9, 6.5). The intervention effect was modified by type of insurance coverage as well as prior mammography history. Process evaluation indicated that bus passes and rescheduling efforts did not contribute to the observed increases in screening participation. CONCLUSIONS: A clinic-based program incorporating physician education, provider prompts, patient education materials, and appointment reminders and emphasizing nursing involvement can facilitate adherence to breast cancer screening guidelines among inner-city women.  相似文献   
50.
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