检索结果-南通市图书馆

Wireless measurement of orthodontic forces in invisible aligners

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Medicine in Novel Technology and Devices 2024年第1期21卷 64-70页

作者： Siyu Wang Bingxin Xu Xiaokang Wang Xinfang li Bangzheng Pu Gui Chen Jianmin Han Shengzhao Xiao Yubo Fan jiebo li Key Laboratory of Biomechanics and Mechanobiology(Beihang University) Ministry of EducationInstitute of Medical PhotonicsBeijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing100191China Department of Orthodontics Peking University School and Hospital of Stomatology&.National Clinical Research Center for Oral Diseases&.National Engineering Laboratory for Digital and Material Technology of Stomatology&.Beijing Key Laboratory of Digital Stomatology&.Research Center of Engineering and Technology for Computerized Dentistry Ministry of HealthBeijing100081China Department of Dental Materials Peking University School and Hospital of Stomatology&National Center of Stomatology&National Clinical Research Center for Oral Diseases&National Engineering Laboratory for Digital and Material Technology of Stomatology&Beijing Key Laboratory of Digital Stomatology&Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health&NMPA Key Laboratory for Dental MaterialsBeijing100081China Department of Orthodontics Shanghai Ninth People's HospitalCollage of StomatologyShanghai Jiao Tong University School of MedicineNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of Stomatology&Shanghai Research Institute of StomatologyShanghaiChina

Invisible orthodontic treatment is an effective form of malocclusion treatment favored in recent *** magnitude of its orthodontic force has a crucial impact on the outcome of the treatment and has gained a high level of clinical ***,there are very few explorations of in vivo measurements of orthodontic force,and existing studies are limited to a large number of couplings,which are inconvenient for clinical *** this work,we developed a wireless flexible measurement system that allows quantitative measurement of the orthodontic force of an invisible aligner on a dental *** system is wireless,tiny,flexible,fast responding,and has a range suitable for the range of orthodontic *** show the difference in the orthodontic force applied to different tooth positions and the difference in the orthodontic force applied to different positions of the same *** addition,the system can evaluate the mechanical differences between aligners of different brands and materials as well as the deviation of fabrication *** system provides a test tool and evaluation method for future real-time assessment of clinical orthodontic forces.

关键词： Orthodontic forces Wireless measurement systems Flexible sensors Invisible orthodontics Performance evaluation Quantitative measurements

Polar-coordinate line-projection light-curing continuous 3D printing for tubular structures

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2024年第4期6卷 247-260页

作者： Huiyuan Wang Siqin liu Xincheng Yin Mingming Huang Yanzhe Fu Xun Chen Chao Wang Jingyong Sun Xin Yan Jianmin Han Jiping Yang Zhijian Wang lizhen Wang Yubo Fan jiebo li Key Laboratory of Biomechanics and Mechanobiology(Beihang University) Ministry of EducationInstitute of Medical PhotonicsBeijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing 100191People's Republic of China School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191People's Republic of China Peking University School and Hospital of Stomatology Beijing 100081People's Republic of China School of Materials Science and Engineering Beihang UniversityBeijing 100191People's Republic of China

3D printing techniques offer an effective method in fabricating complex radially multi-material ***,it is challenging for complex and delicate radially multi-material model geometries without supporting structures,such as tissue vessels and tubular graft,among *** this work,we tackle these challenges by developing a polar digital light processing technique which uses a rod as the printing *** 3D model fabrication is accomplished through line *** rotation and translation of the rod are synchronized to project and illuminate the photosensitive material *** controlling the distance between the rod and the printing window,we achieved the printing of tubular structures with a minimum wall thickness as thin as 50 *** controlling the width of fine slits at the printing window,we achieved the printing of structures with a minimum feature size of 10 *** process accomplished the fabrication of thin-walled tubular graft structure with a thickness of only 100 micrometers and lengths of several centimeters within a timeframe of just 100 ***,it enables the printing of axial multi-material structures,thereby achieving adjustable mechanical *** method is conducive to rapid customization of tubular grafts and the manufacturing of tubular components in fields such as dentistry,aerospace,and more.

关键词： 3D printing polar coordinate line projection light-curing tubular structure radially multi-material structures

计及网压波动的牵引传动系统间谐波传播机理研究

在线全文

学校读者我要写书评

暂无评论

电力自动化设备 2021年第2期41卷 186-192页

作者：张桂南张波黄金陆阳李杰波中国铁道科学研究院集团有限公司机车车辆研究所北京100081

随着多台电力机车同时投入运行后牵引供电系统出现电压波动现象,其在牵引传动系统中的传播特性是当前的研究热点。首先推导了间谐波在牵引传动系统中的传播机理,并分析了定子间谐波电流频谱与负载转矩间的对应关系;其次研究了间谐波传... 详细信息

随着多台电力机车同时投入运行后牵引供电系统出现电压波动现象,其在牵引传动系统中的传播特性是当前的研究热点。首先推导了间谐波在牵引传动系统中的传播机理,并分析了定子间谐波电流频谱与负载转矩间的对应关系;其次研究了间谐波传播下牵引电机电流间谐波辨识方法;随后基于瞬态电流控制策略、磁场定向的矢量控制策略搭建电力机车牵引传动系统的仿真模型,利用扰动激励法模拟了间谐波在牵引传动系统的传播特性;最后结合总体局部均值分解对定子电流的动态频域特性进行分析,确定了整流器输入电压与电机定子电流的间谐波幅频的对应关系。

关键词：牵引传动系统间谐波矢量控制扰动激励法总体局部均值分解

动车组固有速度—单位能耗指标及计算方法研究

在线全文

学校读者我要写书评

暂无评论

铁道机车车辆 2016年第4期36卷 97-98,105页

作者：李杰波中国铁道科学研究院机车车辆研究所北京100081

为获得更高速度条件下动车组能耗水平,研究并提出动车组速度—能耗为目标值的分布规律。通过国内外相关技术文件和动车组试验结果,提出采用动车组在平直道恒速运行时的人均百公里耗电量指标,用于评价动车组由设计制造所赋予的固有能量... 详细信息

为获得更高速度条件下动车组能耗水平,研究并提出动车组速度—能耗为目标值的分布规律。通过国内外相关技术文件和动车组试验结果,提出采用动车组在平直道恒速运行时的人均百公里耗电量指标,用于评价动车组由设计制造所赋予的固有能量消耗水平。根据动车组单位能耗构成特点,给出了具体的单位能耗指标计算方法,分析动车组固有属性决定能耗水平的影响因子。以某高速动车组能耗实测结果为例验证其速度—单位能耗分布规律适用性。

关键词：铁路运输高速动车组速度—单位能耗分布

在线全文

学校读者我要写书评

暂无评论

我国机车车辆互联互通的现状与发展

铁道机车车辆 2017年第6期37卷 17-19,35页

作者：李杰波中国铁道科学研究院机车车辆研究所北京100081

不同生产厂家、不同技术平台客观上形成了目前我国多种型号的交流传动电力机车、电动车组。互联互通技术成为未来提高机车车辆可用性和运输混用需求的重要技术手段。本文介绍了采用无线同步操纵和网络重联实现机车车辆互联互通的技术方... 详细信息

不同生产厂家、不同技术平台客观上形成了目前我国多种型号的交流传动电力机车、电动车组。互联互通技术成为未来提高机车车辆可用性和运输混用需求的重要技术手段。本文介绍了采用无线同步操纵和网络重联实现机车车辆互联互通的技术方案,阐述了动车组互联互通的基本设计要求以及在研动力集中动车组不同动力车、拖车、控制车互联互通及互控技术要求。

关键词：机车车辆网络重联互联互通

在线全文

学校读者我要写书评

暂无评论

学生探究学习的课堂透视与策略改进

科教文汇 2017年第23期 83-84页

作者：李结波安徽省怀宁县石牌镇中心学校安徽安庆246100

探究学习在课堂中依然存在着自主性弱化、开放性不足、科学性不强等问题。针对问题实施策略改进,让学生发现问题,自定方案,深入实践,交流反思,使探究学习真正落地生根。

关键词：探究学习透视策略改进

在线全文

学校读者我要写书评

暂无评论

跨座式单轨车辆整车试验标准适用性分析

铁道机车车辆 2019年第S1期39卷 25-28页

作者：李杰波秦小虎邹欣中国铁道科学研究院集团有限公司机车车辆研究所北京100081 重庆市轨道交通(集团)有限公司重庆401120 中车大连机车车辆有限公司辽宁大连116022

根据跨座式单轨车辆的技术特征和应用特点,对适用于跨座式单轨车辆的整车试验标准进行分析,重点对动力学、牵引、制动及安全设备方面提出了具体的试验建议。

关键词：跨座式单轨试验动力学牵引制动安全

动车组牵引系统部件故障分布规律评估方法研究

在线全文

学校读者我要写书评

暂无评论

铁道机车车辆 2016年第4期36卷 81-84页

作者：李杰波中国铁道科学研究院机车车辆研究所北京100081

基于可靠性理论和动车组牵引系统故障特点,对动车组牵引系统的故障分布规律的分析方法进行了探讨,阐述了用可靠性理论识别系统故障分布规律的模型。提出对动车组牵引系统故障样本极少的部件采用平均故障率描述,对故障规律不明显的部件... 详细信息

基于可靠性理论和动车组牵引系统故障特点,对动车组牵引系统的故障分布规律的分析方法进行了探讨,阐述了用可靠性理论识别系统故障分布规律的模型。提出对动车组牵引系统故障样本极少的部件采用平均故障率描述,对故障规律不明显的部件采用经验分布函数方法,对多种故障模式相互作用部件采用理论分布估计,可以得到较为理想的部件寿命规律。

关键词：动车组可靠性故障分布

Rapid eradication of antibiotic-resistant bacteria and biofilms by MXene and near-infrared light through photothermal ablation

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2021年第3期64卷 748-758页

作者： Fan Wu Huiling Zheng Wenzhao Wang Qiong Wu Qi Zhang Jiayu Guo Bangzheng Pu Xinyuan Shi jiebo li Xiangmei Chen Weili Hong Institute of Medical Photonics Beijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing100191China Department of Microbiology and Infectious Disease Center School of Basic Medical SciencesPeking University Health Science CenterBeijing100191China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of the Chemical PhysicsChinese Academy of SciencesDalian116023China

With the development and rising of antimicrobial resistance,rapid and effective killings of bacteria are urgently needed,especially for antibiotic-resistant bacteria and bacterial biofilms that are usually hard to be treated with conventional ***,a rapid and broad-spectrum antibacterial strategy is demonstrated through photothermal ablation with MXene and ***3C2 MXenes,when combined with 808 nm light,show significant antibacterial effects in just 20 *** antibacterial strategy is effective to 15 bacterial species tested,including methicillin-resistant Staphylococcus aureus(MRSA)and vancomycin-resistant Enterococci(VRE).In addition,the rapid antibacterial strategy works for MRSA biofilms,by damaging the structures as well as killing bacteria in ***,the investigation of the antibacterial mechanisms shows that Ti3C2 with light kills bacteria mainly physically through inserting/contact and photothermal *** work broadens the potential applications of MXene and provides a way to eradicate bacteria and biofilms physically,without the likelihood of resistance development.

关键词： MXenes 2D materials antibiotic-resistance bacteria photothermal