全文获取类型
收费全文 | 4154篇 |
免费 | 677篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 13篇 |
儿科学 | 94篇 |
妇产科学 | 210篇 |
基础医学 | 449篇 |
口腔科学 | 113篇 |
临床医学 | 1052篇 |
内科学 | 695篇 |
皮肤病学 | 47篇 |
神经病学 | 334篇 |
特种医学 | 86篇 |
外科学 | 545篇 |
综合类 | 183篇 |
一般理论 | 12篇 |
预防医学 | 426篇 |
眼科学 | 46篇 |
药学 | 320篇 |
肿瘤学 | 216篇 |
出版年
2023年 | 77篇 |
2021年 | 64篇 |
2020年 | 61篇 |
2019年 | 56篇 |
2018年 | 141篇 |
2017年 | 130篇 |
2016年 | 132篇 |
2015年 | 134篇 |
2014年 | 155篇 |
2013年 | 200篇 |
2012年 | 186篇 |
2011年 | 190篇 |
2010年 | 132篇 |
2009年 | 120篇 |
2008年 | 152篇 |
2007年 | 181篇 |
2006年 | 165篇 |
2005年 | 185篇 |
2004年 | 144篇 |
2003年 | 142篇 |
2002年 | 122篇 |
2001年 | 140篇 |
2000年 | 113篇 |
1999年 | 129篇 |
1998年 | 75篇 |
1997年 | 70篇 |
1996年 | 75篇 |
1995年 | 71篇 |
1994年 | 55篇 |
1993年 | 44篇 |
1992年 | 91篇 |
1991年 | 66篇 |
1990年 | 71篇 |
1989年 | 59篇 |
1988年 | 81篇 |
1987年 | 73篇 |
1986年 | 74篇 |
1985年 | 58篇 |
1984年 | 52篇 |
1983年 | 57篇 |
1982年 | 34篇 |
1979年 | 40篇 |
1978年 | 36篇 |
1977年 | 28篇 |
1976年 | 33篇 |
1975年 | 22篇 |
1973年 | 25篇 |
1972年 | 23篇 |
1969年 | 22篇 |
1967年 | 27篇 |
排序方式: 共有4841条查询结果,搜索用时 343 毫秒
1.
2.
C M Mond D B Walters R S Stricoff E M Prescott A T Prokopetz 《American Industrial Hygiene Association journal》1987,48(10):823-829
A human factors engineering analysis of a chemical containment laboratory was performed to develop appropriate standards for future laboratory design. In order to perform this evaluation, a state-of-the-art facility was studied in depth. Measurements and observations were made of key operating areas. In addition, technicians were observed and interviewed as they performed various tasks. Compiled data were compared to existing ergonomic standards. The occupational implications of instituting ergonomically developed laboratory design standards are as follows: increased worker health, safety and productivity, improved work quality and reduced stress. 相似文献
3.
4.
5.
6.
7.
A comparison of the stressors experienced by parents of intubated and non-intubated children 总被引:3,自引:0,他引:3
Caroline Haines BN RGN RSCN Christine Perger BHSc Sue Nagy RN BA FRCNA FCN 《Journal of advanced nursing》1995,21(2):350-355
When children are ill enough to require admission to paediatric intensive care, parents may become distressed about their child's medical condition and this distress may be compounded by the unfamiliar nature of the highly technological environment Parents of children who are sick enough to warrant intubation are particularly likely to be exposed to a frightening array of technological equipment Seventy-one parents of intubated and non-intubated children completed the Parental Stressor Scale Paediatnc Intensive Care Unit (PSS PICU) Overall the findings suggest that parents were most distressed (a) by the painful procedures to which their children were subjected, (b) by the sights and sounds of the intensive care unit and (c) by their children's reactions to intensive care The behaviour of staff towards parents and the way that staff communicated with them caused the least distress When the levels of stress reported by parents of intubated children were compared with those reported by parents of non-intubated children, different patterns of stress were found Painful procedures were a source of greater stress to parents of intubated children whereas the behaviour of staff and the children's reactions to the intensive care experience caused greater stress to the parents of the non-intubated children In general the findings suggest that the needs of parents of non-intubated children are being overlooked, with staff focusing more of their attention on the parents of intubated children 相似文献
8.
A. B. Rao BN Pranesh Rao 《Indian journal of otolaryngology and head and neck surgery》1991,43(4):210-213
The present study was undertaken to evaluate the noise attenuation characteristics of different types of Ear protective Devices
which are commonly used. 20 healthy normal subjects’ open and closed hearing thresholds (with the usage of ear protective
device) were recorded in an anechoic chamber and the attenuation charactaristics at 8 discrete frequencies were analysed and
compared. Though the attenuation given by different types of ear protective devices are variable and not the ideal, still
the present generation of devices have shown satisfactory attenuation characteristics, It is important that proper selection,
fitment and usage of these devices should he carefully thought of prior to its usage. 相似文献
9.
Four separate experiments were carried out by dosing dogs (Beagles and Border collies) and red foxes with protoscoleces obtained from hydatid cysts in sheep from mid-Wales. The dogs and foxes were killed at intervals over a period from 34-180 days after infection and the intestines were examined for Echinococcus granulosus. Border collie dogs were efficient hosts in that large numbers of worms developed, with gravid segments present by 55 days after infection; but Beagle dogs were poor hosts in that only small numbers of immature worms developed. Foxes were poor hosts in that few or no worms developed, but gravid segments were seen in three of 29 foxes. The worms showed morphological features similar to the 'sheep' rather than the 'horse' strain. 相似文献
10.
Louise Rose MN Adult Ed Cert BN ICU Cert Dip Nurs Marie F. Gerdtz RN BN AE Cert GDAET PhD 《Australasian emergency nursing journal : AENJ》2007,10(1):26-29
The use of mechanical ventilation in the Emergency Department requires adequate resources in order to maintain patient safety and avoid potential risks. Moreover, developments in technology require increased knowledge of mechanical ventilation techniques to address the complexity of decision-making involved. Organisational issues and system factors have the potential to negatively impact on the ability of the emergency service to provide optimum care to patients receiving mechanical ventilation. These issues include staffing and skill-mix, demand on emergency services, role-delineation, scope of practice, and current mechanisms for monitoring of quality and safety. Furthermore, in response to advances in ventilator technology, current education programs for both nursing and medical staff require review to ensure that they provide comprehensive information about the types of ventilation techniques now available and the relative risks and benefits associated with their application.This article is the second in a two-part series and explores the educational and organisational factors that impact upon safety and quality of care delivered to patients receiving mechanical ventilation in the emergency department. Recommendations for future policy development, curriculum review and reporting mechanisms to support further research in the application of mechanical ventilation in the emergency department are made. 相似文献