收费全文 | 1156篇 |
免费 | 68篇 |
国内免费 | 71篇 |
安全科学 | 124篇 |
废物处理 | 21篇 |
环保管理 | 301篇 |
综合类 | 368篇 |
基础理论 | 161篇 |
污染及防治 | 43篇 |
评价与监测 | 19篇 |
社会与环境 | 176篇 |
灾害及防治 | 82篇 |
2024年 | 2篇 |
2023年 | 9篇 |
2022年 | 27篇 |
2021年 | 24篇 |
2020年 | 38篇 |
2019年 | 33篇 |
2018年 | 17篇 |
2017年 | 28篇 |
2016年 | 30篇 |
2015年 | 30篇 |
2014年 | 35篇 |
2013年 | 82篇 |
2012年 | 61篇 |
2011年 | 67篇 |
2010年 | 43篇 |
2009年 | 47篇 |
2008年 | 35篇 |
2007年 | 72篇 |
2006年 | 73篇 |
2005年 | 53篇 |
2004年 | 65篇 |
2003年 | 68篇 |
2002年 | 59篇 |
2001年 | 56篇 |
2000年 | 54篇 |
1999年 | 31篇 |
1998年 | 22篇 |
1997年 | 17篇 |
1996年 | 26篇 |
1995年 | 19篇 |
1994年 | 17篇 |
1993年 | 20篇 |
1992年 | 15篇 |
1991年 | 3篇 |
1990年 | 6篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
Methods: Using a prospective database of HIs from a neurosurgical practice in a sub-Saharan African developing country, a cross-sectional survey was conducted for the trauma demography and clinical epidemiology of this MCC-related HI.
Results: Motorcycle crashes accounted for 57% (473/833) of all RTI-related HIs in this registry. The victims, with a mean age of 33.1 years (SD = 18.3), consisted mainly of males (83.1%), those of low socioeconomic status (>90%), and those aged between 20 and 40 years old (56%). MCCs involved only riders in 114 cases (114/473, 32.1%), of which 69% were motorcycle–motorcycle crashes. The HI was moderate–severe in 50.8%; clinical symptomatology of significant HI included loss of consciousness (92%), anisocoria (35%), Abbreviated Injury Scale head (AIS–head) score > 3 (28%), and CT-Rotterdam score > 3 (30%). Extracranial systemic injury involved the limbs most frequently, with an Injury Severity Score (ISS) >25 in 49%. The fatality rate was 24%.
MCC-related HI among pedestrian victims involved more vulnerable age groups (the young and elderly) but have lower mean ISS compared to motorcycle passengers (mean ISS = 23.5 [11.6] vs. 27.4 [13.0]; 95% confidence interval [CI], 1.27–6.49; P = .004). In addition, compared to a contemporary cohort of MVC-related HIs in our registry, MCC victims were older (mean age 34.8 years [18.0] vs. 30.8 [18.4]; P = .002); had higher proportions of certain extracranial trauma like long bone fractures (71 vs. 29%; P = .02); and suffered fewer surgical brain lesions (25.5 vs. 17.2%; P = .004).
Conclusions: Motorcycle crashes are now a significant threat to the heads, limbs, and lives of vulnerable road users in developing countries. 相似文献