目的建立寰椎横韧带损伤上颈椎C0-C3不稳定节段的三维有限元模型,探究横韧带损伤对上颈椎关节活动度ROM(the range of motion)和椎骨应力分布的影响。方法基于CT图像数据结合临床寰椎横韧带损伤特征,建立人体寰椎横韧带损伤上颈椎不稳...目的建立寰椎横韧带损伤上颈椎C0-C3不稳定节段的三维有限元模型,探究横韧带损伤对上颈椎关节活动度ROM(the range of motion)和椎骨应力分布的影响。方法基于CT图像数据结合临床寰椎横韧带损伤特征,建立人体寰椎横韧带损伤上颈椎不稳定的三维有限元模型,比较分析横韧带损伤后上颈椎在不同工况下的关节活动度及椎骨应力分布情况。结果横韧带损伤后上颈椎寰枢关节在前屈、后伸、侧弯和轴向旋转等工况下的关节活动度均比正常组有不同程度的增大,增值分别为:3.5°、4.8°、1.1°和4.7°;屈伸时横韧带损伤后模型最大应力均比无损模型的大。结论寰椎横韧带损伤后上颈椎模型相比正常模型稳定性差,符合横韧带损伤后的真实情况,建立的有限元模型可用于上颈椎生物力学特性的分析。展开更多
为了满足工程设计需求,提出一种基于系统级封装(System in Package,SIP)技术的多通道L波段收发组件设计方案,详细阐述其实现原理。SIP作为一种先进的系统集成与封装技术,是实现有源相控阵雷达收发(T/R)组件小型化、高密度化及高可靠性...为了满足工程设计需求,提出一种基于系统级封装(System in Package,SIP)技术的多通道L波段收发组件设计方案,详细阐述其实现原理。SIP作为一种先进的系统集成与封装技术,是实现有源相控阵雷达收发(T/R)组件小型化、高密度化及高可靠性的重要途径。针对T/R组件关键技术指标进行设计分析,采用SIP技术进行了关键电路小型化设计,同时进行了多层微波电路PCB设计、T/R模块结构设计等工作,研制了L波段多通道T/R组件实物。收发组件的测试数据验证了设计方案的可行性和工程实用性。展开更多
China＇s animal husbandry industry has developed rapidly and the inventory of swine, poultry, and sheep has been in the first place in the world of late years. For several consecutive years, the annual slaughter swine...China＇s animal husbandry industry has developed rapidly and the inventory of swine, poultry, and sheep has been in the first place in the world of late years. For several consecutive years, the annual slaughter swine has reached to more than 700 million head, 70 million head of carcasses, about 2 million tons. The number will be even more if cattle, sheep and poultry had been considered. If handled improperly, the large number of carcasses of livestock and poultry will seriously pollute environment and even bring food safety issues and harm to public health security. More and more concern has been attracted on harmless disposal of dead animals. Of all the harmless disposal methods on carcasses of livestock and poultry, the application and research of alkalizalion hydrolysisar （ AH ） are less and only restricted in the higher-level security laboratory field in China. The method of alkalization hydrolysis has the advantages of completely inactivating pathogenic microorganisms （including prions）, no harmful gas, simple operation, low cost, etc, which has the value of research and application. This paper summarized the characteristics and the sterilization effect of alkaline hydrolysis, and discussed the processing and application of AH products of animal carcasses ,meanwhile, introduced the types, research and application state of AH in China, finally, briefly discussed the application prospect of AH in China.展开更多
文摘目的基于人体膝关节CT和MRI图像建立前交叉韧带(anterior cruciate ligament,ACL)断裂和正常膝关节三维实体模型,采用有限元方法研究ACL断裂膝关节在不同屈膝角度对植入假体生物力学性能的影响。方法结合临床单髁置换手术方案植入第3代牛津单髁(OxfordⅢ)假体,其中胫骨假体后倾7°,建立膝关节屈曲0°、30°、60°、90°和120°单髁置换的三维有限元模型,在股骨中心点上施加1 k N压缩载荷,分析5种屈膝角度下股骨假体、半月板衬垫、胫骨假体的应力分布情况。结果膝关节ACL断裂组与正常组在5种屈膝状态下,半月板衬垫的最大主应力在ACL断裂组与正常组之间最大相差幅度为62.5%,在0°、30°、60°和120°屈膝状态下ACL断裂组最大应力均大于正常组;股骨假体在ACL断裂30°时的最大应力明显增加,其余4种屈膝状态下应力的最大增幅为60.81%;胫骨假体在5种屈膝状态下ACL断裂组最大应力比正常组分别增加了19.07%、36.78%、25.69%、-4.38%、51.19%。当ACL断裂后,除屈膝90°外半月板衬垫和胫骨假体上的均布应力均大于正常组,在屈膝30°和120°时对半月板衬垫的磨损较大。结论单髁置换假体的应力分布随膝关节屈曲角度和ACL功能的变化而存在差异,ACL断裂组应力整体趋势大于ACL正常组,且应力集中于内侧区域,在屈膝120°时应力最大,磨损最为明显。研究结果为临床膝关节ACL断裂单髁假体置换的手术方案和半月板假体的优化设计提供理论依据。
文摘目的建立寰椎横韧带损伤上颈椎C0-C3不稳定节段的三维有限元模型,探究横韧带损伤对上颈椎关节活动度ROM(the range of motion)和椎骨应力分布的影响。方法基于CT图像数据结合临床寰椎横韧带损伤特征,建立人体寰椎横韧带损伤上颈椎不稳定的三维有限元模型,比较分析横韧带损伤后上颈椎在不同工况下的关节活动度及椎骨应力分布情况。结果横韧带损伤后上颈椎寰枢关节在前屈、后伸、侧弯和轴向旋转等工况下的关节活动度均比正常组有不同程度的增大,增值分别为:3.5°、4.8°、1.1°和4.7°;屈伸时横韧带损伤后模型最大应力均比无损模型的大。结论寰椎横韧带损伤后上颈椎模型相比正常模型稳定性差,符合横韧带损伤后的真实情况,建立的有限元模型可用于上颈椎生物力学特性的分析。
文摘为了满足工程设计需求,提出一种基于系统级封装(System in Package,SIP)技术的多通道L波段收发组件设计方案,详细阐述其实现原理。SIP作为一种先进的系统集成与封装技术,是实现有源相控阵雷达收发(T/R)组件小型化、高密度化及高可靠性的重要途径。针对T/R组件关键技术指标进行设计分析,采用SIP技术进行了关键电路小型化设计,同时进行了多层微波电路PCB设计、T/R模块结构设计等工作,研制了L波段多通道T/R组件实物。收发组件的测试数据验证了设计方案的可行性和工程实用性。
基金Surported by Jiangsu Vocational Colleges Young Teachers Enterprise Practice Training Funding Project(2016QYSJ058)Xuzhou Vocational College of Bioengineering 2017 Science and Technology Project-A Preliminary Study on Farm Animal Welfare(2017KY07)Xuzhou Vocational College of Bioengineering Animal Husbandry and Veterinary Brand Profession Construction Fund
文摘China＇s animal husbandry industry has developed rapidly and the inventory of swine, poultry, and sheep has been in the first place in the world of late years. For several consecutive years, the annual slaughter swine has reached to more than 700 million head, 70 million head of carcasses, about 2 million tons. The number will be even more if cattle, sheep and poultry had been considered. If handled improperly, the large number of carcasses of livestock and poultry will seriously pollute environment and even bring food safety issues and harm to public health security. More and more concern has been attracted on harmless disposal of dead animals. Of all the harmless disposal methods on carcasses of livestock and poultry, the application and research of alkalizalion hydrolysisar （ AH ） are less and only restricted in the higher-level security laboratory field in China. The method of alkalization hydrolysis has the advantages of completely inactivating pathogenic microorganisms （including prions）, no harmful gas, simple operation, low cost, etc, which has the value of research and application. This paper summarized the characteristics and the sterilization effect of alkaline hydrolysis, and discussed the processing and application of AH products of animal carcasses ,meanwhile, introduced the types, research and application state of AH in China, finally, briefly discussed the application prospect of AH in China.
