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   223333篇
  免费   40134篇
  国内免费   7626篇
耳鼻咽喉   3565篇
儿科学   4421篇
妇产科学   5147篇
基础医学   15545篇
口腔科学   7660篇
临床医学   41366篇
内科学   43853篇
皮肤病学   4762篇
神经病学   18295篇
特种医学   7642篇
外国民族医学   40篇
外科学   30488篇
综合类   19766篇
现状与发展   60篇
一般理论   18篇
预防医学   22514篇
眼科学   5525篇
药学   14354篇
  143篇
中国医学   6880篇
肿瘤学   19049篇
  2024年   2067篇
  2023年   7257篇
  2022年   5416篇
  2021年   8170篇
  2020年   9454篇
  2019年   5612篇
  2018年   10582篇
  2017年   10823篇
  2016年   10993篇
  2015年   13009篇
  2014年   16821篇
  2013年   18692篇
  2012年   13469篇
  2011年   13947篇
  2010年   13992篇
  2009年   14956篇
  2008年   10897篇
  2007年   9790篇
  2006年   10563篇
  2005年   8499篇
  2004年   6069篇
  2003年   5332篇
  2002年   4515篇
  2001年   4866篇
  2000年   3951篇
  1999年   4284篇
  1998年   3340篇
  1997年   3088篇
  1996年   2907篇
  1995年   2606篇
  1994年   1946篇
  1993年   1396篇
  1992年   1615篇
  1991年   1416篇
  1990年   1162篇
  1989年   1076篇
  1988年   1014篇
  1987年   817篇
  1986年   700篇
  1985年   568篇
  1984年   428篇
  1983年   459篇
  1982年   313篇
  1981年   285篇
  1980年   184篇
  1979年   200篇
  1978年   230篇
  1977年   197篇
  1974年   164篇
  1972年   157篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
CONTEXT: The physician assistant profession has been moving toward requiring master's degrees for new practitioners, but some argue this could change the face of the discipline. PURPOSE: To see if there is an association between physician assistants' academic degrees and practice in primary care, in rural areas, and with the medically underserved. METHODS: Surveys were sent to 880 graduates of the first 32 University of Washington physician assistant classes through 2000. Respondents noted their academic degree at program entry and the highest degree attained at any time up to the time of survey. Relationships between practice characteristics and academic degree levels were tested by unadjusted odds ratios and logistic regression after controlling for year of graduation and sex. RESULTS: Of the 478 respondents, 54% worked in primary care, about 30% practiced in nonmetropolitan communities, and 42% reported providing care for the medically underserved. Respondents with no degree (33% of total at entry, 24% at survey) were significantly more likely than degree holders to work in primary care and nonmetropolitan areas. Respondents with no degree at program entry were significantly more likely, and those with no degree at the time of the survey were marginally more likely, to self-report work with the medically underserved. CONCLUSION: Respondents with no academic degree are significantly more likely to demonstrate a commitment to primary, rural, and underserved health care. These findings may inform the national debate about the impact of required advanced degrees on the practice patterns of nonphysician providers.  相似文献   
12.
13.
14.
The aim of this study was to design a new intravenous blood–gas exchange device and to estimate the design characteristics of the device with a dimensionless function by using a substance that can be used instead of bovine blood. In addition, the characteristics of oxygen transfer were estimated using empirical formulas and the reliability of the equations was ascertained by comparing their output with an experiment performed using bovine blood. The dimensionless function was derived using distilled water and bovine blood to estimate the oxygen transfer rate. Using the derived equations, the calculated oxygen transfer rates for bovine blood and distilled water were similar for Reynolds numbers ranging from 0.7 to 7.0. Therefore, it is possible to estimate the oxygen transfer rate in bovine blood, which is a non-Newtonian fluid, using distilled water, which is a Newtonian fluid. Moreover, it was possible to verify the related equations because the oxygen transfer rate could be estimated using the derived equations, according to the diameters of the various device modules.  相似文献   
15.
16.
The present study demonstrates that alcohol-induced memory impairment can be attenuated by pretreatment with an oral tryptophan supplementation. These results provide support for the role of a brain serotonin deficit in this impairment and highlight the impact a dietary manipulation can have on a complex behavioral process.  相似文献   
17.
18.
The definition of envy is commonly based on psychoanalytical views of organizational culture. The purpose of this paper is to describe envy in a nursing community. The population study consisted of random sample of 120 subjects drawn from among the employees of one central hospital in Finland. The study material consisted of data collected by questionnaires (response rate 65%). The data were processed by various statistical methods. Open-ended questions were analysed by inductive content analysis. The results of this study indicated that the employee's view of his/her official position in the nursing community, his/her relationships with his/her fellow workers and the management as well as relationships with other nursing communities are all related to envy. The employee's view of his/her official position intensified his/her feelings of envy, if he/she had other negative feelings, anxiety, dissatisfaction with him/herself, and negative feelings towards fellow workers. The major object of envy was fellow workers' salaries. Envy towards other nursing communities was generated by alleged differences in the amount of labour, or by the charge nurse's greater interest in other sections. Employees coped with envy by hiding these feelings and being modest. Women coped with envy by being silent, while men denied the value of the object of envy.  相似文献   
19.
20.
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