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   91234篇
  免费   9373篇
  国内免费   2838篇
耳鼻咽喉   414篇
儿科学   2471篇
妇产科学   914篇
基础医学   7569篇
口腔科学   1230篇
临床医学   8481篇
内科学   8967篇
皮肤病学   1161篇
神经病学   6659篇
特种医学   1175篇
外国民族医学   7篇
外科学   2911篇
综合类   11280篇
现状与发展   10篇
一般理论   8篇
预防医学   9390篇
眼科学   1132篇
药学   31391篇
  70篇
中国医学   4151篇
肿瘤学   4054篇
  2024年   105篇
  2023年   1409篇
  2022年   1816篇
  2021年   3170篇
  2020年   3467篇
  2019年   3343篇
  2018年   3232篇
  2017年   3629篇
  2016年   3544篇
  2015年   3486篇
  2014年   5774篇
  2013年   9224篇
  2012年   5838篇
  2011年   6047篇
  2010年   4962篇
  2009年   4579篇
  2008年   4353篇
  2007年   4412篇
  2006年   3889篇
  2005年   3475篇
  2004年   2999篇
  2003年   2630篇
  2002年   2086篇
  2001年   1951篇
  2000年   1560篇
  1999年   1325篇
  1998年   1120篇
  1997年   1003篇
  1996年   878篇
  1995年   922篇
  1994年   799篇
  1993年   678篇
  1992年   732篇
  1991年   608篇
  1990年   534篇
  1989年   424篇
  1988年   415篇
  1987年   384篇
  1986年   363篇
  1985年   406篇
  1984年   353篇
  1983年   243篇
  1982年   209篇
  1981年   221篇
  1980年   176篇
  1979年   130篇
  1978年   137篇
  1977年   83篇
  1976年   91篇
  1975年   69篇
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
1.
2.
An accumulating body of evidence has associated exposure to greenspace with improved birth outcomes, including higher birth weight and lower risk of low birth weight; however, evidence on such association with in-utero fetal growth is scarce. We explored the influence of maternal exposure to residential greenspace and fetal growth in four INMA (Infancia y Medio Ambiente) Spanish birth cohorts (2003–2008), with 2,465 participants. Residential greenspace was characterised by the Normalised Difference Vegetation Index (NDVI) average across 100 m, 300 m, and 500 m buffers around the residence. Repeated ultrasound measurements of the abdominal circumference (AC), biparietal diameter (BPD), femur length (FL), and estimated fetal weight (EFW) were used. We created customised-generalised least squares models to evaluate associations of residential greenspace exposure on each fetal growth parameter, controlled for the relevant confounders. There were associations between the 500 m buffer and BPD, FL, and AC. We also found associations in the 300 m buffer and FL and AC. The associations in the 100 m buffer were null. Estimates were higher among participants with lower socioeconomic status. Mediation analyses found that air pollution might explain 15–37% of our associations. Mediation by physical activity was not observed. Greenspace exposure may be beneficial for fetal growth.  相似文献   
3.
BackgroundAdverse drug reactions (ADRs) and adverse drug events (ADEs) in older people contribute to a significant proportion of hospital admissions and are common following discharge. Effective interventions are therefore required to combat the growing burden of preventable ADRs. The Prediction of Hospitalisation due to Adverse Drug Reactions in Elderly Community Dwelling Patients (PADR-EC) score is a validated risk score developed to assess the risk of ADRs in people aged 65 years and older and has the potential to be utilised as part of an intervention to reduce ADRs.ObjectivesThis trial was designed to investigate the effectiveness of an intervention to reduce ADR incidence in older people and to obtain further information about ADRs and ADEs in the 12–24 months following hospital discharge.MethodsThe study is an open-label randomised-controlled trial to be conducted at the Royal Hobart Hospital, a 500-bed public hospital in Tasmania, Australia. Community-dwelling patients aged 65 years and older with an unplanned overnight admission to a general medical ward will be recruited. Following admission, the PADR-EC ADR score will be calculated by a research pharmacist, with the risk communicated to clinicians and discussed with participants. Following discharge, nominated general practitioners and community pharmacists will receive the risk score and related medication management advice to guide their ongoing care of the patient. Follow-up with participants will occur at 3 and 12 and 18 and 24 months to identify ADRs and ADEs. The primary outcome is moderate-severe ADRs at 12 months post-discharge, and will be analysed using the cumulative incidence proportion, survival analysis and Poisson regression.SummaryIt is hypothesised that the trial will reduce ADRs and ADEs in the intervention population. The study will also provide valuable data on post-discharge ADRs and ADEs up to 24 months post-discharge.  相似文献   
4.
Transition to practice experiences for new primary care nurse practitioners (NPs) is of interest, particularly considering the lack of requirements and options for formal training programs. The purpose of this article is to describe new primary care NPs’ experience and perceived needs of transitioning to practice. New Nebraska NPs were surveyed. The main findings include increased confidence and perceived preparedness after 3 months of practice, as well as challenges and helpful supportive services for transitioning to practice. Additional information on the transition to practice experience was provided and supports developing a formal program.  相似文献   
5.
美国食品药品管理局(FDA)于2022年7月发布了"治疗等效性评价供企业用指导原则"(草案)。该指导原则阐明了FDA治疗等效性的标准以及治疗等效性编码系统,目的是准确评价仿制药与参比制剂的治疗等效性并通过治疗等效性代码,在"橙皮书"中迅速检索到治疗等效的仿制药。而中国目前尚无类似的指导原则,详细介绍FDA该指导原则主要内容,期望对中国加强仿制药的治疗等效性评价和加速完善和实施符合国情的治疗等效性编码系统有所帮助。  相似文献   
6.
7.
8.
前列腺癌(prostate cancer, PCa)是中老年男性常见恶性肿瘤之一,目前尚缺乏有效的晚期癌症治疗方法,因此早期诊断对于降低PCa死亡率至关重要。近年来,较多研究开发出多种新型诊断方法以改善对PCa诊断的准确性,同时避免过度诊疗,但其有效性及实用性尚需进一步验证。本文对目前新型生物标志物、联合成像技术及风险预测模型等的早期诊断技术进行总结,以期为临床研究提供指导作用。  相似文献   
9.
10.
The ability to manage patient telephone calls competently and confidently is an important skill for nurse practitioners (NPs). A curriculum intervention was implemented in a pediatric NP program to promote this skill. Thirty-nine NP students participated in a mock telephone triage experience to determine whether triage, involving student/faculty mock parent telephone calls, would increase the student’s confidence and competence. A Likert scale pre/post questionnaire surveying perceived confidence, competence, and readiness to practice revealed an increase in students’ confidence in decision making, assessing the patient, and making a diagnosis over the phone.  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