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   204308篇
  免费   10867篇
  国内免费   686篇
耳鼻咽喉   2983篇
儿科学   6267篇
妇产科学   4766篇
基础医学   27898篇
口腔科学   6266篇
临床医学   15100篇
内科学   48380篇
皮肤病学   5997篇
神经病学   18265篇
特种医学   4743篇
外国民族医学   3篇
外科学   23315篇
综合类   1388篇
一般理论   114篇
预防医学   21041篇
眼科学   4027篇
药学   14111篇
中国医学   973篇
肿瘤学   10224篇
  2023年   1605篇
  2022年   2734篇
  2021年   6279篇
  2020年   3345篇
  2019年   5677篇
  2018年   7682篇
  2017年   4719篇
  2016年   4764篇
  2015年   5298篇
  2014年   6904篇
  2013年   9626篇
  2012年   15093篇
  2011年   15907篇
  2010年   8317篇
  2009年   6742篇
  2008年   12069篇
  2007年   12568篇
  2006年   11693篇
  2005年   11506篇
  2004年   10228篇
  2003年   9503篇
  2002年   8653篇
  2001年   4806篇
  2000年   5318篇
  1999年   4262篇
  1998年   1245篇
  1997年   954篇
  1996年   802篇
  1995年   687篇
  1994年   545篇
  1993年   447篇
  1992年   1692篇
  1991年   1406篇
  1990年   1257篇
  1989年   1059篇
  1988年   937篇
  1987年   857篇
  1986年   855篇
  1985年   743篇
  1984年   545篇
  1983年   459篇
  1979年   476篇
  1978年   322篇
  1975年   321篇
  1974年   401篇
  1973年   408篇
  1972年   348篇
  1971年   381篇
  1970年   332篇
  1969年   361篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
81.

Objective

To discover the experiences of end-of-life patients attended by the emergency services, through the discourse of the family caregivers who accompanied the family member in this care transit.

Method

A qualitative approach study, based on the paradigm of hermeneutical phenomenology. In total, 81 family caregivers participated. The techniques used were the in-depth interview and the discussion group, with a total of 5 discussion groups and 41 interviews. The period of data collection was carried out between January 2013 and June 2014.

Results

In the network of discourses obtained with respect to “Urgent Care”, all the codes were grouped in relation to a single argumentative line: deficiencies in urgent care. Among them, we found different dimensions that are established depending on the different times of care, or the different determinant aspects of these deficiencies: disorganization of the care received, lack of experience of the professionals in emergencies, application of general protocols in the emergency services, inadequate care in the treatment received, delays in emergency care.

Conclusions

In general, we highlight the dissatisfaction of the family members with respect to the care received from the emergency services. The needs of these types of situation are not covered from these services and are of low quality. Therefore, it is necessary to reorient the care protocols for these patients.  相似文献   
82.
83.
84.
85.
86.
Several tools to facilitate the risk assessment and management of manufactured nanomaterials (MN) have been developed. Most of them require input data on physicochemical properties, toxicity and scenario-specific exposure information. However, such data are yet not readily available, and tools that can handle data gaps in a structured way to ensure transparent risk analysis for industrial and regulatory decision making are needed. This paper proposes such a quantitative risk prioritisation tool, based on a multi-criteria decision analysis algorithm, which combines advanced exposure and dose-response modelling to calculate margins of exposure (MoE) for a number of MN in order to rank their occupational risks. We demonstrated the tool in a number of workplace exposure scenarios (ES) involving the production and handling of nanoscale titanium dioxide, zinc oxide (ZnO), silver and multi-walled carbon nanotubes. The results of this application demonstrated that bag/bin filling, manual un/loading and dumping of large amounts of dry powders led to high emissions, which resulted in high risk associated with these ES. The ZnO MN revealed considerable hazard potential in vivo, which significantly influenced the risk prioritisation results. In order to study how variations in the input data affect our results, we performed probabilistic Monte Carlo sensitivity/uncertainty analysis, which demonstrated that the performance of the proposed model is stable against changes in the exposure and hazard input variables.  相似文献   
87.
88.
89.
90.
Most of the patients who overcome the SARS-CoV-2 infection do not present complications and do not require a specific follow-up, but a significant proportion (especially those with moderate / severe clinical forms of the disease) require clinicalradiological follow-up. Although there are hardly any references or clinical guidelines regarding the long-term follow-up of post-COVID-19 patients, radiological exams are being performed and monographic surveillance consultations are being set up in most of the hospitals to meet their needs. The purpose of this work is to share our experience in the management of the post-COVID-19 patient in two institutions thathave had a high incidence of COVID-19 and to propose general follow-uprecommendations from a clinical and radiological perspective.  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