全文获取类型
收费全文 | 3703914篇 |
免费 | 316902篇 |
国内免费 | 13731篇 |
专业分类
耳鼻咽喉 | 50900篇 |
儿科学 | 118385篇 |
妇产科学 | 97250篇 |
基础医学 | 580883篇 |
口腔科学 | 102749篇 |
临床医学 | 331535篇 |
内科学 | 661508篇 |
皮肤病学 | 95200篇 |
神经病学 | 316993篇 |
特种医学 | 148614篇 |
外国民族医学 | 497篇 |
外科学 | 572504篇 |
综合类 | 113747篇 |
现状与发展 | 23篇 |
一般理论 | 2377篇 |
预防医学 | 309523篇 |
眼科学 | 85796篇 |
药学 | 259744篇 |
22篇 | |
中国医学 | 10125篇 |
肿瘤学 | 176172篇 |
出版年
2021年 | 55074篇 |
2020年 | 35094篇 |
2019年 | 58024篇 |
2018年 | 71474篇 |
2017年 | 54499篇 |
2016年 | 60293篇 |
2015年 | 74270篇 |
2014年 | 108550篇 |
2013年 | 173632篇 |
2012年 | 97364篇 |
2011年 | 97800篇 |
2010年 | 117798篇 |
2009年 | 122087篇 |
2008年 | 85491篇 |
2007年 | 88829篇 |
2006年 | 99726篇 |
2005年 | 94864篇 |
2004年 | 97450篇 |
2003年 | 87904篇 |
2002年 | 77744篇 |
2001年 | 120837篇 |
2000年 | 115135篇 |
1999年 | 111694篇 |
1998年 | 67017篇 |
1997年 | 64579篇 |
1996年 | 62576篇 |
1995年 | 58189篇 |
1994年 | 52342篇 |
1993年 | 48884篇 |
1992年 | 82931篇 |
1991年 | 79396篇 |
1990年 | 75940篇 |
1989年 | 74611篇 |
1988年 | 69442篇 |
1987年 | 68135篇 |
1986年 | 64927篇 |
1985年 | 64803篇 |
1984年 | 56579篇 |
1983年 | 51281篇 |
1982年 | 44753篇 |
1981年 | 41911篇 |
1980年 | 39511篇 |
1979年 | 48958篇 |
1978年 | 40955篇 |
1977年 | 36773篇 |
1976年 | 34074篇 |
1975年 | 32836篇 |
1974年 | 35532篇 |
1973年 | 34193篇 |
1972年 | 31687篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
AbstractPurpose: In the context of assistive technology, mobility takes the meaning of “moving safely, gracefully, and comfortably”.The aim of this article is to provide a system which will be a convenient means of navigation for the Visually Impaired people, in the public transport system.Method: A blind regular commuter who travels by public transport facility finds difficulty in identifying the vehicle that is nearing the stop. Hence, a real-time system that dynamically identifies the nearing vehicle and informs the commuters is necessary. This paper proposes such a system namely the “Vehicle Board Recognition System” (VBRS). Computer Vision techniques such as segmentation, object recognition, text detection and optical character recognition are utilized to build the system, which will detect, analyze, derive and communicate the information to the passengers.Results: Thanks to the rapid development in technology, there are several navigation systems both hand held and wearable, available to help visually impaired (VI) people move comfortably both indoor and outdoor. Many blind people are not comfortable in using these devices or they are not affordable for them. Thus the proposed system gives them the comfort of navigation.Conclusion: This system can be installed in the bus stop to assist the Visually Impaired, from externally rather than their hand held or wearable assistive devices.
- Implications for rehabilitation
This proposed system will help the visually impaired to
ensure secure navigation
be independent of the others
develop self confidence.
overcome the training, affordability of wearable/ handheld devices.
992.
993.
Christopher R. LaFever 《Death Studies》2020,44(12):819-822
994.
Novel coronavirus, SARS-CoV2, has caused pandemic of highly contagious disease called coronavirus disease 2019 (COVID-19), with epicenters in China, Italy, 相似文献
995.
996.
Diffuse dermal angiomatosis: a contributory factor to ulceration in a patient with renal transplant 下载免费PDF全文
We present the case of a 54‐year‐old patient with renal transplant who developed unusual vascular changes on the forearm distal to a functioning arteriovenous fistula, as well as a painful ulcerated lesion on her anterior abdominal wall. We believe that the diffuse dermal angioendotheliomatosis variant of reactive angioendotheliomatosis had a role in the pathogenesis of this patient's lesions. 相似文献
997.
998.
999.
1000.