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   1164824篇
  免费   77023篇
  国内免费   1564篇
耳鼻咽喉   16385篇
儿科学   37459篇
妇产科学   30935篇
基础医学   165637篇
口腔科学   31957篇
临床医学   100496篇
内科学   225112篇
皮肤病学   27009篇
神经病学   88633篇
特种医学   44881篇
外国民族医学   203篇
外科学   174746篇
综合类   22173篇
现状与发展   1篇
一般理论   288篇
预防医学   84729篇
眼科学   26679篇
药学   92910篇
  7篇
中国医学   3099篇
肿瘤学   70072篇
  2021年   9059篇
  2019年   9529篇
  2018年   14418篇
  2017年   10754篇
  2016年   11836篇
  2015年   13273篇
  2014年   17399篇
  2013年   25776篇
  2012年   36524篇
  2011年   38355篇
  2010年   22081篇
  2009年   20034篇
  2008年   34993篇
  2007年   37364篇
  2006年   37867篇
  2005年   36233篇
  2004年   34491篇
  2003年   32961篇
  2002年   31747篇
  2001年   62861篇
  2000年   64569篇
  1999年   53408篇
  1998年   12919篇
  1997年   11268篇
  1996年   11331篇
  1995年   10570篇
  1994年   9551篇
  1993年   9037篇
  1992年   38939篇
  1991年   37305篇
  1990年   36731篇
  1989年   35154篇
  1988年   31658篇
  1987年   30767篇
  1986年   28934篇
  1985年   27111篇
  1984年   19702篇
  1983年   16522篇
  1982年   9019篇
  1979年   17532篇
  1978年   11699篇
  1977年   10493篇
  1976年   9128篇
  1975年   10383篇
  1974年   12136篇
  1973年   11715篇
  1972年   11134篇
  1971年   10455篇
  1970年   9669篇
  1969年   9328篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
111.

Introduction/Hypothesis

Recruitment of participants into phase 1 vaccine clinical trials can be challenging since these vaccines have not been used in humans and there is no perceived benefit to the participant. Occasionally, as was the case with a phase 1 clinical trial of an Ebola vaccine in Halifax, Canada, during the 2014–2016 West African Ebola virus outbreak, recruitment is less difficult. In this study, we explored the motivations of participants in two phase 1 vaccine trials that were concurrently enrolling at the same centre and compared the motivations of participants in a high-profile phase 1 Ebola vaccine trial to those in a less high-profile phase 1 adjuvanted seasonal influenza vaccine study.

Methods

An online survey which included participants’ prior experience with clinical trials, motivations to participate (including financial incentives), and demographic information was developed to examine the motivations of healthy participants in two phase 1 clinical vaccine trials conducted at the Canadian Center for Vaccinology in Halifax, Nova Scotia. Participants were invited via email to complete the online survey. Readability and clarity were assessed through pilot testing.

Results

A total of 49 (55.7%) of 88 participants of the two studies completed the survey (22 [55%] of 40 participants from the Ebola vaccine study and 27 [56.3%] of 48 from the adjuvanted influenza vaccine study). Motivations that were most frequently ranked among participants' top three in both trials were (1) wanting to contribute to the health of others, (2) wanting to participate in something important, (3) wanting to contribute to the advancement of science, and (4) wanting to receive an incentive such as money or a tablet.

Conclusions/Recommendations

Although media attention and financial compensation were more often cited by Ebola vaccine trial participants as a reason to participate, both altruistic and self-interested factors were important motivations for participants in their decision to participate in a phase 1 vaccine clinical trial.  相似文献   
112.
113.
114.
115.
Bulletin of Experimental Biology and Medicine - Fast neutron therapy, which previously has demonstrated effective results, but along with a large number of complications, can again be considered a...  相似文献   
116.
Background: Most theoretical models of self-determination suggest that both environmental and personal factors influence the development of self-determination. The design and implementation of interventions must be conducted with foreknowledge of such mediating and moderating factors if the intervention is to be successful.

Methods: The purpose of this study was to examine the degree to which several personal factors and school characteristics affect and explain students’ self-determination. A total of 232 students with intellectual disability from Spain participated. Their self-determination level was assessed by the ARC-INICO Scale.

Results: Students with moderate levels of intellectual disability obtained significantly lower scores on self-determination than their peers with mild intellectual disability. There were significant differences in relation to the level of support needs and their experience with transition programs. The level of support needs was a significant predictor.

Conclusion: These findings contribute to current research in this field and practical implications were discussed.  相似文献   

117.
Abstract

Objectives: This study examined word use as an indicator of interpersonal positive reframing in daily conversations of couples coping with breast cancer and as a predictor of stress.

Design: The Electronically Activated Recorder (EAR) and Linguistic Inquiry and Word Count (LIWC) were used to examine naturally occurring word use conceptually linked to positive reframing (positive emotion, negative emotion, and cognitive processing words).

Sample: Fifty-two couples coping with breast cancer.

Methods: Couples wore the EAR, a device participants wear, that audio-recorded over one weekend (>16,000 sound files), and completed self-reports of positive reframing (COPE) and stress (Perceived Stress Scale). LIWC, a software program, measured word use.

Findings: Both partners’ word use (i.e., positive emotion and cognitive processing words) was associated with their own reported positive reframing, and spouses’ word use was also indicative of patients’ positive reframing. Results also revealed that, in general, words indicating positive reframing predicted lower levels of stress.

Conclusions: Findings supported the hypothesis that partners—and particularly spouses of breast cancer patients—may assist each other’s coping by positively reframing the cancer experience and other negative experiences in conversation.  相似文献   
118.
119.
Journal of Digital Imaging - Vertebral Compression Fracture (VCF) occurs when the vertebral body partially collapses under the action of compressive forces. Non-traumatic VCFs can be secondary to...  相似文献   
120.
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