全文获取类型
收费全文 | 103709篇 |
免费 | 29511篇 |
国内免费 | 1123篇 |
专业分类
耳鼻咽喉 | 2459篇 |
儿科学 | 2750篇 |
妇产科学 | 2372篇 |
基础医学 | 3179篇 |
口腔科学 | 5202篇 |
临床医学 | 26170篇 |
内科学 | 26362篇 |
皮肤病学 | 3406篇 |
神经病学 | 12874篇 |
特种医学 | 3808篇 |
外科学 | 18948篇 |
综合类 | 167篇 |
现状与发展 | 40篇 |
一般理论 | 1篇 |
预防医学 | 13262篇 |
眼科学 | 2388篇 |
药学 | 1299篇 |
中国医学 | 24篇 |
肿瘤学 | 9632篇 |
出版年
2024年 | 753篇 |
2023年 | 5081篇 |
2022年 | 1241篇 |
2021年 | 2940篇 |
2020年 | 5416篇 |
2019年 | 2138篇 |
2018年 | 7071篇 |
2017年 | 7445篇 |
2016年 | 8017篇 |
2015年 | 8099篇 |
2014年 | 10559篇 |
2013年 | 12260篇 |
2012年 | 3981篇 |
2011年 | 3721篇 |
2010年 | 6902篇 |
2009年 | 9157篇 |
2008年 | 3637篇 |
2007年 | 2565篇 |
2006年 | 3717篇 |
2005年 | 2363篇 |
2004年 | 1706篇 |
2003年 | 1350篇 |
2002年 | 1251篇 |
2001年 | 2024篇 |
2000年 | 1356篇 |
1999年 | 1849篇 |
1998年 | 2136篇 |
1997年 | 1958篇 |
1996年 | 1991篇 |
1995年 | 1727篇 |
1994年 | 1131篇 |
1993年 | 942篇 |
1992年 | 913篇 |
1991年 | 794篇 |
1990年 | 650篇 |
1989年 | 676篇 |
1988年 | 648篇 |
1987年 | 486篇 |
1986年 | 457篇 |
1985年 | 413篇 |
1984年 | 345篇 |
1983年 | 380篇 |
1982年 | 259篇 |
1981年 | 229篇 |
1980年 | 148篇 |
1979年 | 137篇 |
1978年 | 162篇 |
1977年 | 163篇 |
1976年 | 128篇 |
1972年 | 122篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
Timothy C. Evans MD PhD ; Keren H. Wick PhD ; Douglas M. Brock PhD ; Douglas C. Schaad PhD ; Ruth Ballweg MPA PA-C 《The Journal of rural health》2006,22(3):212-219
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
13.
14.
15.
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
16.
17.
Edward R. Westrick MS Allan P. Shapiro PhD Peter E. Nathan PhD John Brick PhD 《Alcoholism, clinical and experimental research》1988,12(4):531-533
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
18.
19.
Eija Heikkinen MNSc RN Merja Nikkonen PhD RN & Helena Aavarinne PhD RN 《Journal of advanced nursing》1998,27(5):1069-1075
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
20.