目的:总结成人急性创伤病人院前急救中病情评估指标的文献证据,为构建急诊急救大平台下“零通道”启用指标提供循证依据。方法:检索BMJ Best Practice、the Cochrane Library、PubMed、美国指南网、中国知网等国内外循证数据库和指南网...目的:总结成人急性创伤病人院前急救中病情评估指标的文献证据,为构建急诊急救大平台下“零通道”启用指标提供循证依据。方法:检索BMJ Best Practice、the Cochrane Library、PubMed、美国指南网、中国知网等国内外循证数据库和指南网站中关于“零通道”、院前急救创伤评分以及创伤团队启用标准的专家共识、系统评价、相关指南、Meta分析和高质量临床研究等。检索时限为2010年1月—2021年10月。由2名研究者对纳入文献的质量进行评价,并对符合质量标准的文献进行证据提取及总结。结果:共纳入17篇相关文献,其中专家共识3篇、临床研究9篇、指南1篇、系统评价4篇,最终在意识状态、生命体征、创伤机制等方面总结了10条证据。结论:系统总结了成人急性创伤病人院前急救启用“零通道”指标的最佳证据,为构建急诊急救大平台下“零通道”启用指标提供了循证参考。展开更多
In order to establish the quantitative relationship between equivalent strain and the performance index of the deformed material within the range of certain passes for equal channel angular processing （ECAP）, a new ...In order to establish the quantitative relationship between equivalent strain and the performance index of the deformed material within the range of certain passes for equal channel angular processing （ECAP）, a new approach to characterize the equivalent strain was proposed. The results show that there exists better accordance between mechanical property （such as hardness or strength） and equivalent strain after rolling and ECAP in a certain range of deformation amount, and Gauss equation can be satisfied among the equivalent strain and the mechanical properties for ECAP. Through regression analysis on the data of hardness and strength after the deformation, a more generalized expression of equivalent strain for ECAP is proposed as：ε=k0exp[-（k1M-k2）^2], where M is the strength or hardness of the material, k1 is the modified coefficient （k1∈ （0, 1））, ko and k2 are two parameters dependent on the critical strain and mechanical property that reaches saturation state for the material, respectively. In this expression the equivalent strain for ECAP is characterized novelly through the mechanical parameter relating to material property rather than the classical geometry equation.展开更多
文摘目的:总结成人急性创伤病人院前急救中病情评估指标的文献证据,为构建急诊急救大平台下“零通道”启用指标提供循证依据。方法:检索BMJ Best Practice、the Cochrane Library、PubMed、美国指南网、中国知网等国内外循证数据库和指南网站中关于“零通道”、院前急救创伤评分以及创伤团队启用标准的专家共识、系统评价、相关指南、Meta分析和高质量临床研究等。检索时限为2010年1月—2021年10月。由2名研究者对纳入文献的质量进行评价,并对符合质量标准的文献进行证据提取及总结。结果:共纳入17篇相关文献,其中专家共识3篇、临床研究9篇、指南1篇、系统评价4篇,最终在意识状态、生命体征、创伤机制等方面总结了10条证据。结论:系统总结了成人急性创伤病人院前急救启用“零通道”指标的最佳证据,为构建急诊急救大平台下“零通道”启用指标提供了循证参考。
基金Projects(50471102,50671089) supported by the National Natural Science Foundation of China
文摘In order to establish the quantitative relationship between equivalent strain and the performance index of the deformed material within the range of certain passes for equal channel angular processing （ECAP）, a new approach to characterize the equivalent strain was proposed. The results show that there exists better accordance between mechanical property （such as hardness or strength） and equivalent strain after rolling and ECAP in a certain range of deformation amount, and Gauss equation can be satisfied among the equivalent strain and the mechanical properties for ECAP. Through regression analysis on the data of hardness and strength after the deformation, a more generalized expression of equivalent strain for ECAP is proposed as：ε=k0exp[-（k1M-k2）^2], where M is the strength or hardness of the material, k1 is the modified coefficient （k1∈ （0, 1））, ko and k2 are two parameters dependent on the critical strain and mechanical property that reaches saturation state for the material, respectively. In this expression the equivalent strain for ECAP is characterized novelly through the mechanical parameter relating to material property rather than the classical geometry equation.
