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   15516篇
  免费   1557篇
  国内免费   439篇
耳鼻咽喉   204篇
儿科学   150篇
妇产科学   517篇
基础医学   1153篇
口腔科学   350篇
临床医学   2179篇
内科学   1046篇
皮肤病学   83篇
神经病学   419篇
特种医学   603篇
外科学   833篇
综合类   2979篇
一般理论   7篇
预防医学   2561篇
眼科学   174篇
药学   2085篇
  60篇
中国医学   1795篇
肿瘤学   314篇
  2024年   45篇
  2023年   390篇
  2022年   640篇
  2021年   942篇
  2020年   879篇
  2019年   648篇
  2018年   701篇
  2017年   753篇
  2016年   740篇
  2015年   716篇
  2014年   1319篇
  2013年   1587篇
  2012年   1209篇
  2011年   1167篇
  2010年   839篇
  2009年   733篇
  2008年   765篇
  2007年   641篇
  2006年   566篇
  2005年   427篇
  2004年   354篇
  2003年   295篇
  2002年   209篇
  2001年   182篇
  2000年   140篇
  1999年   102篇
  1998年   71篇
  1997年   72篇
  1996年   70篇
  1995年   62篇
  1994年   44篇
  1993年   26篇
  1992年   36篇
  1991年   19篇
  1990年   23篇
  1989年   13篇
  1988年   17篇
  1987年   13篇
  1986年   10篇
  1985年   8篇
  1984年   7篇
  1983年   6篇
  1982年   6篇
  1981年   4篇
  1980年   5篇
  1979年   2篇
  1978年   1篇
  1976年   2篇
  1974年   2篇
  1973年   4篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
目的:阐述动物智能在军事学的应用及意义。方法:以学术论文、新闻、报纸、智库报告等作为信息源,综合研究国外动物智能军事应用实例及内在关联,描述动物智能在未来战场应用场景。结果:动物智能军事应用主要是动物特殊能力的军事应用和动物智能的仿生武器应用。结论:动物部队、仿生作战部队和动物战术是未来战争不可忽视的重要组成部分,动物智能的隐匿、灵活、多变等特点正逐渐被广泛应用于战场。  相似文献   
2.
《Molecular therapy》2022,30(1):32-46
  1. Download : Download high-res image (81KB)
  2. Download : Download full-size image
  相似文献   
3.
《Molecular therapy》2022,30(1):209-222
  1. Download : Download high-res image (131KB)
  2. Download : Download full-size image
  相似文献   
4.
《Enfermería clínica》2022,32(3):171-183
IntroductionAgeing is a period of physical and psychological changes. Inactivity is one of the biggest problems among the older adult population increasing the risk of sarcopenia and chronic diseases. Physical activity is an effective intervention to improve health outcomes. In recent years, there has been an increase in the use of technology, with health technology tools (ICT) appearing as an intervention to increase physical activity and improve associated health problems.ObjectiveIn this review, we evaluated the effectiveness of health technology to increase physical activity and to improve cardiovascular parameters in older adults.MethodologyStudies with a great variety of health technology tools to increase physical activity levels, and that evaluated the effect of that increase on cardiovascular parameters were included by searching the main databases.ResultsEleven studies reporting the use of a variety of ICT tools were included in this review. Despite these differences, the effectiveness of health technology tool interventions has been demonstrated in increasing physical activity and reducing cardiovascular parameters.DiscussionThe lack of adherence of older adults to health technology would be a disadvantage, but it has been shown that younger older adults are more familiar with health technology tools and the number using them is increasing.ConclusionHealth technology tools show effectiveness in increasing physical activity in older adults and improving cardiovascular parameters.  相似文献   
5.
Lipid nanoparticles (LNPs) are becoming popular as a means of delivering therapeutics, including those based on nucleic acids and mRNA. The mRNA-based coronavirus disease 2019 vaccines are perfect examples to highlight the role played by drug delivery systems in advancing human health. The fundamentals of LNPs for the delivery of nucleic acid- and mRNA-based therapeutics, are well established. Thus, future research on LNPs will focus on addressing the following: expanding the scope of drug delivery to different constituents of the human body, expanding the number of diseases that can be targeted, and studying the change in the pharmacokinetics of LNPs under physiological and pathological conditions. This review article provides an overview of recent advances aimed at expanding the application of LNPs, focusing on the pharmacokinetics and advantages of LNPs. In addition, analytical techniques, library construction and screening, rational design, active targeting, and applicability to gene editing therapy have also been discussed.  相似文献   
6.
7.
《Vaccine》2022,40(12):1855-1863
Renewed COVID-19 outbreaks, stemming from the highly infectious Delta and Omicron variants, prompted rising fears of a ‘pandemic among the unvaccinated’. To address this prevalent vaccination crisis, media framing communication strategies can amplify the scientific evidence on COVID-19 vaccines to reach diverse geographic and socio-economic communities. The critical role of media framing strategies to engage and encourage large populations regarding vaccine acceptance has been rarely studied, despite growing evidence on vaccine hesitancy. The present study used a multi-method approach (i.e., content analysis and quasi-experiments) that unpacked the framing practices employed by the mainstream media in Pakistan. The findings of the content analysis revealed that the media extensively used uncertainty, conflict, consequences, and action rather than new evidence and reassurance frames in its COVID-19 related campaigns. In a series of quasi-experiments involving 720 participants, we manipulated these six frames of COVID-19 related news coverage (i.e., uncertainty, conflict, consequences, action, new evidence, and reassurance) to investigate the underlying mechanism that influences vaccine acceptance. The findings established that the message-consistent effects of media frames manifesting fear (e.g., consequence and uncertainty) and action cues made receivers more supportive of vaccination. The present study findings theoretically address the calls for a more inclusive “community-health reporting model”, besides offering new evidence on the media framing strategies to deliver more targeted, meaningful, and effective campaigns to raise public acceptance for COVID-19 vaccines.  相似文献   
8.
《Value in health》2022,25(9):1480-1488
ObjectivesInvolvement of patients and medical professionals in assessment of relative effectiveness (relative effectiveness assessment) contributes to an efficient and effective health technology assessment (HTA) process and supports acceptance and implementation of the outcome. This study aimed to analyze stakeholder involvement in assessing relative effectiveness and how the parties involved value this collaboration.MethodsThis is a document analysis of all drug assessments completed in 2019 (20) by the public HTA agency of The Netherlands, enriched with semistructured interviews with employees of the HTA agency (18) and representatives of patient (5) and medical (11) associations involved in these assessments. Data were analyzed, coded, and categorized.ResultsIn almost half of the assessments, there was no coordination with the medical associations at the start of the relative effectiveness assessment and no patient associations involved in this phase. During the assessment procedure, patient and medical associations were always asked to comment on the draft report. Nevertheless, the strict 5-day deadline that the HTA agency uses as a response period often hampered a proper response and involvement. According to interviewees of the HTA agency, this leads to a great diversity in the substantive quality of their input. Patient and medical associations indicated that the HTA agency relies too much on “paper knowledge,” which leads to a (perceived) lack of alignment with clinical practice.ConclusionsThe limited involvement results in a lack of coordination and mutual trust. Optimizing involvement of patients and medical professionals in HTA practice requires effort from all parties involved. Procedural adjustments and better coordination, especially at the start of the assessment, would probably improve cooperation.  相似文献   
9.
生理电信号作为生物医学工程中的重要信号,其中蕴含了丰富的人体信息。该研究以生理电信号为主线,通过对其信号的学习、获取、分析、处理将生物医学工程的专业课串联起来,使学生将专业知识和实际仪器设计分析结合起来,能较为全面的掌握信号与系统方面的知识,加强学生的实际分析和解决医学问题的能力。  相似文献   
10.
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