全文获取类型
收费全文 | 384858篇 |
免费 | 44073篇 |
国内免费 | 3229篇 |
专业分类
耳鼻咽喉 | 7452篇 |
儿科学 | 11377篇 |
妇产科学 | 6785篇 |
基础医学 | 33491篇 |
口腔科学 | 6022篇 |
临床医学 | 49962篇 |
内科学 | 94965篇 |
皮肤病学 | 10640篇 |
神经病学 | 38025篇 |
特种医学 | 16362篇 |
外国民族医学 | 13篇 |
外科学 | 76608篇 |
综合类 | 2836篇 |
现状与发展 | 73篇 |
一般理论 | 186篇 |
预防医学 | 23679篇 |
眼科学 | 9020篇 |
药学 | 16940篇 |
1篇 | |
中国医学 | 343篇 |
肿瘤学 | 27380篇 |
出版年
2024年 | 789篇 |
2023年 | 5827篇 |
2022年 | 3325篇 |
2021年 | 8237篇 |
2020年 | 8710篇 |
2019年 | 7117篇 |
2018年 | 13062篇 |
2017年 | 11384篇 |
2016年 | 12807篇 |
2015年 | 13676篇 |
2014年 | 22994篇 |
2013年 | 26087篇 |
2012年 | 22570篇 |
2011年 | 23416篇 |
2010年 | 19941篇 |
2009年 | 22774篇 |
2008年 | 21568篇 |
2007年 | 20689篇 |
2006年 | 22607篇 |
2005年 | 19865篇 |
2004年 | 18172篇 |
2003年 | 15929篇 |
2002年 | 15346篇 |
2001年 | 5903篇 |
2000年 | 4605篇 |
1999年 | 5347篇 |
1998年 | 6344篇 |
1997年 | 5580篇 |
1996年 | 5173篇 |
1995年 | 4868篇 |
1994年 | 3430篇 |
1993年 | 3010篇 |
1992年 | 2445篇 |
1991年 | 2411篇 |
1990年 | 1963篇 |
1989年 | 2020篇 |
1988年 | 1775篇 |
1987年 | 1546篇 |
1986年 | 1592篇 |
1985年 | 1468篇 |
1984年 | 1506篇 |
1983年 | 1358篇 |
1982年 | 1575篇 |
1981年 | 1397篇 |
1980年 | 1231篇 |
1979年 | 837篇 |
1978年 | 902篇 |
1977年 | 903篇 |
1976年 | 683篇 |
1975年 | 640篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
N. Cody Schaal Raushan A. Salaam Michael Stevens Alex Stubner 《Journal of occupational and environmental hygiene》2019,16(5):329-335
The purpose of this investigation was to characterize noise levels in spaces designated as “effective quiet” areas on a U.S. Navy aircraft carrier. Noise dosimetry samples were collected in 15 designated spaces, representing 15 noise measurements, while at-sea during airwing carrier qualifications. Equivalent sound level (Leq) measurements were collected during flight operations (Leq (flt ops)), non-flight operations (Leq (non-flt ops)), and over 24-hr periods (Leq (24-hr)). These data were compared to the 70 dBA American Conference of Governmental Industrial Hygienists (ACGIH®) Threshold Limit Value (TLV®) for “effective quiet” areas intended for temporary threshold shift recovery when personnel live and work in a potentially noise hazardous environment for periods greater than 24?hr. The monitored areas were selected based on personnel occupancy/use during off-duty time periods. Areas were classified by either (1) leisure areas that included mess (eating areas), gyms, lounges, an internet cafe, and the fantail social area or (2) berthing (sleeping) areas. The Leq measurements in decibels “A” weighted (dBA) were compared to determine significant differences between Leq (flt ops), Leq (non-flt ops), and Leq (24-hr) and were compared between leisure area and berthing area. Measured noise levels according to time period ranged as follows: (1) Leq (24-hr): 70.8–105.4 dBA; (2) Leq (flt ops): 70–101.2 dBA; and (3) Leq (non-flt ops): 39.4–104.6 dBA. All area measurements over the 24-hr period and during flight operations and 46.7% of the areas during the non-flight operation time period exceeded the “effective quiet” 70 dBA ACGIH TLV. Mean Leqs were 15 dBA higher during flight operations compared to non-flight operations in “effective quiet” areas (p?=?0.001). The Leqs in leisure areas were significantly higher than berthing areas by approximately 21 dBA during non-flight operation periods (p?=?0.001). Results suggest noise levels in “effective quiet” areas frequented by aircraft carrier personnel during off-duty hours when at-sea may inhibit auditory recovery from occupational noise exposures that occur on-duty. 相似文献
2.
3.
4.
This article describes a case of anaphylaxis secondary to chlorhexidine during urethral catheterisation. Despite little evidence for the use of antiseptic lubricants in preventing catheter-associated urinary tract infections, the distribution and use of such products continues to be widespread. Chlorhexidine-free lubricating gel is widely available and should be used for urological procedures wherever possible. 相似文献
5.
6.
7.
Interprofessional collaboration and communication in nursing homes: a qualitative exploration of problems in medical care for nursing home residents – study protocol 下载免费PDF全文
8.
9.
Lois Isaksen MD 《Academic emergency medicine》2015,22(9):1125-1126
10.
Anuj Shrestha Zeeshan Jawa Kathryn L. Koch Amy B. Rankin Qun Xiang Anand Padmanabhan Matthew S. Karafin Joshua J. Field 《Journal of clinical apheresis》2015,30(6):353-358
Red cell exchange (RCE) is a common procedure in adults with sickle cell disease (SCD). Implantable dual lumen Vortex (DLV) ports can be used for RCE in patients with poor peripheral venous access. We performed a retrospective cohort study of RCE procedures performed in adults with SCD. The main objective of the study was to compare the inlet speed, duration of procedures and rate of complications performed through DLV ports to those performed through temporary central venous and peripheral catheters. Twenty‐nine adults with SCD underwent a total of 318 RCE procedures. Twenty adults had DLV ports placed and 218 procedures were performed using DLV ports. Mean length of follow‐up after DLV port placement was 397 ± 263 days. Six DLV ports were removed due to infection and 1 for malfunction after a mean of 171 ± 120 days. Compared to temporary central venous and peripheral catheters, DLV port procedures had a greater rate of procedural complications, a longer duration, and a lower inlet speed (all P < 0.01). When accounting for the maximum allowable inlet speed to avoid citrate toxicity, 40% of DLV port procedures were greater than 10% below maximum speed, compared to 7 and 14% of procedures performed through temporary central venous and peripheral catheters (P < 0.0001). In conclusion, DLV ports can be used for RCE in adults with SCD, albeit with more procedural complications and longer duration. The smaller internal diameter and longer catheter of DLV ports compared to temporary central venous catheters likely accounts for the differences noted. J. Clin. Apheresis 30:353–358, 2015. © 2015 Wiley Periodicals, Inc. 相似文献