根据制造业对产品物料清单(Bill of Material,BOM)的管理和使用要求,设计了基于产品结构的多视图动态管理框架。所提出的多视图动态管理框架支持产品结构视图的动态定义和转化,实现了以产品结构为中心的产品数据的管理、动态跟踪与追溯...根据制造业对产品物料清单(Bill of Material,BOM)的管理和使用要求,设计了基于产品结构的多视图动态管理框架。所提出的多视图动态管理框架支持产品结构视图的动态定义和转化,实现了以产品结构为中心的产品数据的管理、动态跟踪与追溯,以及跨BOM的工程变更管理。动态管理框架已经在航天型号协同研制平台(Aerospace Vehicles Integrated Design and Manufacturing,AVIDM)中得以应用,可为PLM/PDM系统提供参考。展开更多
sorbitan monolaurate(Span 20)is a famous nonionic surfactant which possesses many excellent properties such as emulsifying,dispersing,nontoxic,nonirritant and lowvolatilization.Span 20 was synthesized from sorbito...sorbitan monolaurate(Span 20)is a famous nonionic surfactant which possesses many excellent properties such as emulsifying,dispersing,nontoxic,nonirritant and lowvolatilization.Span 20 was synthesized from sorbitol and laurate by onestep method which made the etherification and esterification work simultaneously.The synthesis method was compared and the main influencing factors on the products color and three targets(acid number,hydroxide value and saponification value)such as reacting temperature and time were also studied.Finally,the suitable conditions for the synthesis of Span 20 products were obtained,i.e.,reaction temperature 215°C,reaction time 240 min and w(phosphoric acid)=043%.The analysis results showed that the experimenting samples’three targets were eligible,the color was ivory,and it’s monoester massfractions was higher than 90%.展开更多
文摘根据制造业对产品物料清单(Bill of Material,BOM)的管理和使用要求,设计了基于产品结构的多视图动态管理框架。所提出的多视图动态管理框架支持产品结构视图的动态定义和转化,实现了以产品结构为中心的产品数据的管理、动态跟踪与追溯,以及跨BOM的工程变更管理。动态管理框架已经在航天型号协同研制平台(Aerospace Vehicles Integrated Design and Manufacturing,AVIDM)中得以应用,可为PLM/PDM系统提供参考。
文摘sorbitan monolaurate(Span 20)is a famous nonionic surfactant which possesses many excellent properties such as emulsifying,dispersing,nontoxic,nonirritant and lowvolatilization.Span 20 was synthesized from sorbitol and laurate by onestep method which made the etherification and esterification work simultaneously.The synthesis method was compared and the main influencing factors on the products color and three targets(acid number,hydroxide value and saponification value)such as reacting temperature and time were also studied.Finally,the suitable conditions for the synthesis of Span 20 products were obtained,i.e.,reaction temperature 215°C,reaction time 240 min and w(phosphoric acid)=043%.The analysis results showed that the experimenting samples’three targets were eligible,the color was ivory,and it’s monoester massfractions was higher than 90%.
