全文获取类型
收费全文 | 1419篇 |
免费 | 167篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 25篇 |
儿科学 | 15篇 |
妇产科学 | 9篇 |
基础医学 | 99篇 |
口腔科学 | 113篇 |
临床医学 | 303篇 |
内科学 | 98篇 |
皮肤病学 | 5篇 |
神经病学 | 53篇 |
特种医学 | 16篇 |
外科学 | 87篇 |
综合类 | 171篇 |
一般理论 | 2篇 |
预防医学 | 401篇 |
眼科学 | 4篇 |
药学 | 131篇 |
4篇 | |
中国医学 | 32篇 |
肿瘤学 | 25篇 |
出版年
2024年 | 3篇 |
2023年 | 53篇 |
2022年 | 71篇 |
2021年 | 104篇 |
2020年 | 98篇 |
2019年 | 95篇 |
2018年 | 71篇 |
2017年 | 76篇 |
2016年 | 68篇 |
2015年 | 68篇 |
2014年 | 107篇 |
2013年 | 121篇 |
2012年 | 73篇 |
2011年 | 69篇 |
2010年 | 59篇 |
2009年 | 70篇 |
2008年 | 68篇 |
2007年 | 44篇 |
2006年 | 62篇 |
2005年 | 46篇 |
2004年 | 32篇 |
2003年 | 29篇 |
2002年 | 27篇 |
2001年 | 13篇 |
2000年 | 10篇 |
1999年 | 9篇 |
1998年 | 5篇 |
1997年 | 8篇 |
1996年 | 4篇 |
1995年 | 6篇 |
1994年 | 2篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 4篇 |
1975年 | 1篇 |
排序方式: 共有1593条查询结果,搜索用时 15 毫秒
1.
2.
3.
Efficient Denoising Framework for Mammogram Images with a New Impulse Detector and Non-Local Means 下载免费PDF全文
Harikumar RajaguruSannasi Chakravarthy S R 《Asian Pacific journal of cancer prevention》2020,21(1):179-183
Objective: The survival rates of breast cancer are increasing as screening and diagnosis improve. The removal of noise is revealed to be a significant step for automatic - computer aided detection (CAD) of microcalcification in digital mammography. Methods: In this paper, a combined approach for eradicating impulse noise from digital mammograms is proposed. The process is achieved in two stages, detection of noise followed by filtering of noise. The detection of noise is carried out by using Modified Robust Outlyingness Ratio (mROR) trailed by an extended NL (Non-Local)-means filter for filtering mechanism. Results: According to the value of mROR, all pixels in mammogram images are divided into four distinct groups. In each cluster, many decision rules are then applied for detecting the impulse noise. Filtering is done with NL-means filter by providing a reference mammogram image. Conclusion: The comparative analysis and evaluated results are compared with some existing filters which indicate that the proposed structure outperforms the analysed result of others. 相似文献
4.
《Vaccine》2020,38(45):7118-7128
IntroductionToward the Global Vaccine Action Plan 2020 goal, almost 90% of countries have established a National Immunization Technical Advisory Group (NITAG). However, little is known about NITAG's contributions to governance.MethodsIn 2017–2018, a two-step, qualitative retrospective study was conducted. Jordan (JO), Argentina (AR), and South Africa (SA) were selected owing to government-financed NITAGs from middle-income countries (MICs), geographic diversity, and a vaccine introduction with NITAG support. Country case studies were developed, collecting data through desk review and face-to-face key informant interviews (KIIs) from Ministry of Health (MoH) and NITAG. Case studies were analyzed together, to assess governance applying the European Observatory on Health Systems and Policies framework focusing on transparency, accountability, participation, integrity, and policy capacity (TAPIC).ResultsDocument review and 53 KII (22 AR, 20 SA, 11 JO) showed NITAGs played a pivotal role as advisors promoting a culture of evidence-informed policies. NITAGs strengthened governance, although practices varied among countries. Meetings were conducted behind-closed-doors, participation restricted to members, only in one country agendas, and recommendations were public (AR). To increase participation, policy capacity, and transparency, countries considered adding experts in communications, advocacy, and economics. AR and SA contemplated including community members. NITAGs functioned autonomously from the government, with no established internal or external monitoring or supervision. NITAG meeting minutes allowed the review of integrity, adherence to terms of reference, standard operating procedures, and conflict of interest (CoI). For the most part, NITAGs abided by their mandates. Significant issues were related to the level of MoH support and oversight of CoI declaration and documentation.ConclusionsSystematically implementing governance approaches could improve processes, better tailor policies, and implementation. The long-term survival and resilience of NITAGs in these countries showed they play a significant role in strengthening governance. Lessons learned could be useful to those promoting country-driven evidence-informed decision-making. 相似文献
5.
Quality of life in stroke survivor–caregiver dyads: a new conceptual framework and longitudinal study protocol 下载免费PDF全文
6.
7.
《Journal of Science and Medicine in Sport》2020,23(8):726-734
A multitude of athletic injuries occur when the various tissues that make up the human body experience stresses and strains that exceed their material strength. The precise amount of stress and strain that any given tissue can withstand is determined by the mechanical properties and resultant strength of that particular tissue. These mechanical properties are directly determined by an individual’s physiology and acute regulation of these properties. A number of theoretical frameworks for athletic injury occurrence have been proposed, however, a detailed conceptual framework for injury aetiology that considers the interplay between the physiological and mechanical factors and outlines the causal pathways to tissue damage and injury is needed. This will guide injury research towards a more thorough investigation of causal mechanisms and understanding of risk factors. Further, it is important to take into account the considerable differences in loading patterns which can result in varying injury outcomes such as acute stress-related, strain-related, or overuse injury. Within this article a simplified conceptual model of athletic injury is proposed along with a detailed, evidence-informed, conceptual framework for athletic injury aetiology that focuses on stress-related, strain-related, and overuse injury. 相似文献
8.
Jerome Marley Julia Taylor Jane Brocksom Kath Schubach Andrea Nixon Paula Allchorne Susanne Vahr Lauridsen 《International Journal of Urological Nursing》2020,14(1):5-12
A series of three World Café events centred on the topic of developing an Educational Framework for Urological Nursing [EFUN] were held by the British Association of Urological Nurses [BAUN], the European Association of Urology Nurses [EAUN] and the Australian and New Zealand Urological Nursing Society [ANZUNS] between 2017 and 2019. About 376 urology nurses participated in these “conversations that matter” and generated 1047 individual response items that were grouped into themes to assist the three associations to take the creation of an EFUN to the next level. Areas explored centred on four aspects: what any agreed educational framework for urology nursing should contain; the academic level at which education should be provided; who should be recruited as collaborators on writing an educational framework and, lastly, just how any emergent framework should be used. Analysis of the conversational data indicate that there exists within the urological nursing community a collective wisdom regarding their educational needs and how these needs should be met. 相似文献
9.
安惠侯 《齐齐哈尔医学院学报》2006,(1)
美国在中东遇到大麻烦,主要战略目标未能实现。伊拉克安全形势持续严峻,巴以和谈停滞不前,伊朗核问题难以解决,压叙利亚屈服迄未奏效,恐怖活动越反越多,大中东改造计划受挫。美遇到的困难未超出其承受能力,美国在中东仍居主导地位,美中东政策在手法和策略上有所调整,实质上并无变化。 相似文献
10.
应用多孔高密度聚乙烯支架行儿童全耳再造术 总被引:3,自引:0,他引:3
目的总结20例儿童应用多孔高密度聚乙烯(Medpor)支架全耳再造术的经验,以利于提高此项手术效果。方法2000~2004年,应用该支架施行全耳再造术20例,其中左侧6例,右侧14例。残耳大小1 cm×1 cm~6.3 cm×2.0 cm。Ⅰ期再造11例(Medpor支架置入、颞浅筋膜瓣与残耳皮瓣转移加全厚皮片移植);Ⅱ期再造9例(其中耳后皮瓣扩张法2例,Ⅰ期残耳旷置、Medpor支架置入、颞浅筋膜瓣转移加全厚皮片移植,Ⅱ期耳垂、耳屏成形7例)。结果Ⅰ期愈合17例,延迟愈合3例,Ⅱ期修复5例,取出支架1例。20例中19例获随访,随访时间3月至3年。再造耳大小5.3 cm×3.2 cm~7.2 cm×5.2 cm,与健耳无明显差别;再造耳解剖轮廓显现较好,但质地稍偏硬,耳屏或耳垂需不同程度的修整。结论应用Medpor支架具有以下主要优点:⑴不造成其他部位的创伤;⑵手术时间缩短;⑶支架可与局部组织融合并稳妥固定;⑷支架无变形或吸收,组织排斥现象较少;⑸术后及随访显示,再造耳轮廓较为清晰、美观。该支架仍是目前儿童行全耳再造术较适宜的人工支架材料。 相似文献