ASTM F75 is a low-carbon CoCrMo alloy which has been used as hip implant material for decades,but the ASTM F75 implants can fail when the femoral head and the acetabular cup loosen because of limited metal-on-metal be...ASTM F75 is a low-carbon CoCrMo alloy which has been used as hip implant material for decades,but the ASTM F75 implants can fail when the femoral head and the acetabular cup loosen because of limited metal-on-metal bearing.Therefore,a modified version of ASTM F75 alloy which has 90 wt.%ASTM F75 plus 10 wt.%Cr is proposed.The wear and corrosion resistance of both alloys are investigated simulating the working environment of hip implants in human body.The mechanics behavior of the femoral implant under the loading condition in human body with ASTM F75 or modified ASTM F75 material used is studied with FEA simulation.The cytotoxicity(MTT)assays of the alloys are measured and compared to that of inert ceramic and cytotoxic cobalt.The experimental and simulation results show that the proposed alloy exhibits better wear and corrosion resistance than the conventional hip implant material.Both alloys behave well with respect to stress and deformation when used for the femoral implant under the loading condition in human body.These two alloys display similar cytotoxicity performance to inert ceramic.展开更多
在部分计算机联锁系统中,输入和输出采用安全编码的方式来保证采集和驱动的安全性。安全编码需事先固化到安全输入/输出板的Flash存储器中,输入/输出板通过读取安全编码的状态来判断系统是否正常工作。为此设计了使用C8051F020单片机作...在部分计算机联锁系统中,输入和输出采用安全编码的方式来保证采集和驱动的安全性。安全编码需事先固化到安全输入/输出板的Flash存储器中,输入/输出板通过读取安全编码的状态来判断系统是否正常工作。为此设计了使用C8051F020单片机作为控制器的编程器,并基于Qt设计了上位机程序来实现对输入/输出板上28F128J3F75 Nor Flash的操作,包括自动识别输入/输出板、读/写安全编码等。在文中详细介绍了系统结构、硬件连接、软件设计以及上位机读/写安全编码的数据格式定义。展开更多
基金The authors are grateful for financial support from Natural Science&Engineering Research Council of Canada(NSERC).
文摘ASTM F75 is a low-carbon CoCrMo alloy which has been used as hip implant material for decades,but the ASTM F75 implants can fail when the femoral head and the acetabular cup loosen because of limited metal-on-metal bearing.Therefore,a modified version of ASTM F75 alloy which has 90 wt.%ASTM F75 plus 10 wt.%Cr is proposed.The wear and corrosion resistance of both alloys are investigated simulating the working environment of hip implants in human body.The mechanics behavior of the femoral implant under the loading condition in human body with ASTM F75 or modified ASTM F75 material used is studied with FEA simulation.The cytotoxicity(MTT)assays of the alloys are measured and compared to that of inert ceramic and cytotoxic cobalt.The experimental and simulation results show that the proposed alloy exhibits better wear and corrosion resistance than the conventional hip implant material.Both alloys behave well with respect to stress and deformation when used for the femoral implant under the loading condition in human body.These two alloys display similar cytotoxicity performance to inert ceramic.
文摘在部分计算机联锁系统中,输入和输出采用安全编码的方式来保证采集和驱动的安全性。安全编码需事先固化到安全输入/输出板的Flash存储器中,输入/输出板通过读取安全编码的状态来判断系统是否正常工作。为此设计了使用C8051F020单片机作为控制器的编程器,并基于Qt设计了上位机程序来实现对输入/输出板上28F128J3F75 Nor Flash的操作,包括自动识别输入/输出板、读/写安全编码等。在文中详细介绍了系统结构、硬件连接、软件设计以及上位机读/写安全编码的数据格式定义。
