基于中国保险汽车安全指数25%偏置碰撞工况,对某新能源汽车A柱的结构设计方案进行了研究。对比分析了基础结构、复合车身解决方案(Composite Body Solutions,CBS)胶块增强结构、热气胀形管梁增强结构对碰撞安全性的影响,介绍了CBS胶块...基于中国保险汽车安全指数25%偏置碰撞工况,对某新能源汽车A柱的结构设计方案进行了研究。对比分析了基础结构、复合车身解决方案(Composite Body Solutions,CBS)胶块增强结构、热气胀形管梁增强结构对碰撞安全性的影响,介绍了CBS胶块和热气胀形的制造工艺,并对热气胀形工艺进行了仿真分析,对比分析2种增强结构的工装投入和单件成本。研究发现,在均能实现小偏置碰撞安全性优秀等级的前提下,1500 MPa热气胀管梁方案在单件成本及轻量化方面比CBS胶块方案更具优势。展开更多
目的：分析多灶运动神经病（multifocal motor neuropathy，MMN）的临床及神经电生理特点。方法：对13例MMN患者进行神经传导和常规肌电图（EMG）检查，采用微移（inching）技术判定是否有运动神经传导阻滞（CB）。结果：全部患者均隐...目的：分析多灶运动神经病（multifocal motor neuropathy，MMN）的临床及神经电生理特点。方法：对13例MMN患者进行神经传导和常规肌电图（EMG）检查，采用微移（inching）技术判定是否有运动神经传导阻滞（CB）。结果：全部患者均隐袭起病，进展缓慢，临床上以单肢无力为首发症状，随病情发展，受累部位增加。常规神经传导检查可见所有明显萎缩肌肉的复合肌动作电位（CMAP）波幅下降；13例患者神经受累区域以下所支配肌肉EMG检查可见不同程度的神经原性损害。采用微移技术共测定出CB25处和拟诊CB6处。在3条临床及EMG测定均正常的神经发现5处CB，其余26处CB或拟诊CB均发生于轻度至中度无力的肌肉所对应的20条神经。结论：MMN是一种以远端神经受累为主的不对称性周围神经病，神经电生理检查对诊断和鉴别诊断MMN起重要作用，CB是MMN的主要神经电生理表现。展开更多
Multi-terminal direct current(MTDC)grids provide the possibility of meshed interconnections between regional power systems and various renewable energy resources to boost supply reliability and economy.The modular mul...Multi-terminal direct current(MTDC)grids provide the possibility of meshed interconnections between regional power systems and various renewable energy resources to boost supply reliability and economy.The modular multilevel converter(MMC)has become the basic building block for MTDC and DC grids due to its salient features,i.e.,modularity and scalability.Therefore,the MMC-based MTDC systems should be pervasively embedded into the present power system to improve system performance.However,several technical challenges hamper their practical applications and deployment,including modeling,control,and protection of the MMC-MTDC grids.This paper presents a comprehensive investigation and reference in modeling,control,and protection of the MMC-MTDC grids.A general overview of state-of-the-art modeling techniques of the MMC along with their performance in simulation analysis for MTDC applications is provided.A review of control strategies of the MMC-MTDC grids which provide AC system support is presented.State-of-the art protection techniques of the MMCMTDC systems are also investigated.Finally,the associated research challenges and trends are highlighted.展开更多
文摘基于中国保险汽车安全指数25%偏置碰撞工况,对某新能源汽车A柱的结构设计方案进行了研究。对比分析了基础结构、复合车身解决方案(Composite Body Solutions,CBS)胶块增强结构、热气胀形管梁增强结构对碰撞安全性的影响,介绍了CBS胶块和热气胀形的制造工艺,并对热气胀形工艺进行了仿真分析,对比分析2种增强结构的工装投入和单件成本。研究发现,在均能实现小偏置碰撞安全性优秀等级的前提下,1500 MPa热气胀管梁方案在单件成本及轻量化方面比CBS胶块方案更具优势。
文摘目的：分析多灶运动神经病（multifocal motor neuropathy，MMN）的临床及神经电生理特点。方法：对13例MMN患者进行神经传导和常规肌电图（EMG）检查，采用微移（inching）技术判定是否有运动神经传导阻滞（CB）。结果：全部患者均隐袭起病，进展缓慢，临床上以单肢无力为首发症状，随病情发展，受累部位增加。常规神经传导检查可见所有明显萎缩肌肉的复合肌动作电位（CMAP）波幅下降；13例患者神经受累区域以下所支配肌肉EMG检查可见不同程度的神经原性损害。采用微移技术共测定出CB25处和拟诊CB6处。在3条临床及EMG测定均正常的神经发现5处CB，其余26处CB或拟诊CB均发生于轻度至中度无力的肌肉所对应的20条神经。结论：MMN是一种以远端神经受累为主的不对称性周围神经病，神经电生理检查对诊断和鉴别诊断MMN起重要作用，CB是MMN的主要神经电生理表现。
基金funded by SGCC Science and Technology Program under project Research on Electromagnetic Transient Simulation Technology for Large-scale MMC-HVDC Systems.
文摘Multi-terminal direct current(MTDC)grids provide the possibility of meshed interconnections between regional power systems and various renewable energy resources to boost supply reliability and economy.The modular multilevel converter(MMC)has become the basic building block for MTDC and DC grids due to its salient features,i.e.,modularity and scalability.Therefore,the MMC-based MTDC systems should be pervasively embedded into the present power system to improve system performance.However,several technical challenges hamper their practical applications and deployment,including modeling,control,and protection of the MMC-MTDC grids.This paper presents a comprehensive investigation and reference in modeling,control,and protection of the MMC-MTDC grids.A general overview of state-of-the-art modeling techniques of the MMC along with their performance in simulation analysis for MTDC applications is provided.A review of control strategies of the MMC-MTDC grids which provide AC system support is presented.State-of-the art protection techniques of the MMCMTDC systems are also investigated.Finally,the associated research challenges and trends are highlighted.
