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DETERMINATION OF QUADRICEPS FORCES IN SQUAT AND ITS APPLICATION IN CONTACT PRESSURE ANALYSIS OF KNEE JOINT

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Acta Mechanica Solida Sinica 2012年第1期25卷 53-60页

作者： Yuan Guo xushu zhang Meiwen An Weiyi Chen Institute of Applied Mechanics and Biomedical Engineering Taiyuan University of TechnologyTaiyuan 030024China

While the quadriceps muscles of human body are quite important to the daily ac-tivities of knee joints,the determination of quadriceps forces poses significant challenges since it cannot be measured in ***,a novel approach is presented to obtain the forces in squat through the combination of motion photography,force transducers measuring,multi-rigid-body theory and finite element ***,the geometrical and angular data of human for squat process were obtained through the analysis of photographed pictures for human squat with *** the same time,force transducers were used to measure the reaction forces from feet and to determine the center of gravity for identical squat ***,based on the multi-rigid-body dynamics,a mathematical model for human right leg and foot was established in order to determine the quadriceps torques under different squat ***,so as to determine the quadriceps forces along with varied squat angles,a simplified three-dimensional finite element model was built,including tibia,fibula,patella,patella ligament and quadriceps ***,the contact pressure of knee joint was analyzed for the squat with the established model of knee joint involving the obtained quadriceps forces from finite element *** it showed that in the 0-90 degree squat process,the peak value of contact pressure of articular cartilages and menisci is increased with the increased squat *** study can be referenced for further un-derstanding of the biomechanical behaviors of knee,contact pressure effects of daily activities on knee,and is significantly instructive for sports rehabilitation.

关键词： quadriceps force force transducers motion analysis finite element analysis squat

Investigation into the analysis method for assessing contact stress in joint prosthesis

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Medicine in Novel Technology and Devices 2024年第2期22卷 51-58页

作者： Weiling Cui xushu zhang Weiyi Chen Ji Qiu College of Biomedical Engineering Taiyuan University of TechnologyTaiyuan030024China College of Aeronautics and Astronautics Taiyuan University of TechnologyTaiyuan030024China

Contact stress is the important cause of wear and failure of knee joint prostheses implanted in the human body during *** calculation of contact stress on joint prostheses is often inaccurate due to the deviation of joint position during *** paper proposes a correction method for contact stress based on finite element ***,the contact stress and contact radius between femoral and tibial prostheses of knee joint were calculated and analyzed by Hertz contact ***,individualized finite element models based on the individualized geometry of the joint prosthesis and individualized loading were constructed,and the finite element contact stress was *** finite element results were calibrated utilizing the Hertz contact ***tionally,this study investigated the impact of three gait patterns(normal gait,medial thrust gait,and bouncing gait)on the contact stress experienced by the tibial *** research methods and results can provide ideas for theoretical analysis and finite element simulation of prosthetic joint contact,as well as offer theoretical support and analysis methods for evaluating the lifespan of prosthetic joints.

关键词： Contact stress Joint prosthesis Hertz contact Finite element model

Biomechanical analysis of bone mesoscopic structure and mechanical properties of vertebral endplates of degenerated intervertebral discs in rabbits

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Medicine in Novel Technology and Devices 2024年第2期22卷 59-72页

作者： Bingying Zhao Yuan Guo xushu zhang Yibo Zhao Bin Zhao Ming zhang College of Biomedical Engineering Taiyuan University of TechnologyTaiyuan030024China The Second Hospital of Shanxi Medical University Taiyuan City030001China Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong999077China

In previous studies of disc degeneration,the structural and mechanical properties of the endplate were often *** this paper,the station legislation was used to construct an animal model of minor trauma disc degeneration,and the mechanism of disc degeneration was further investigated by observing the changes of mesoscopic structure and developing the mechanical properties of endplate ***-eight 6-month-old Japanese white rabbits were divided into two groups:control group and experimental *** animal model of intervertebral disc degeneration was established by upright experiment in the experimental *** bone mesoscopic structures in different areas of each endplate were observed by histological and imaging methods,and the mechanical properties of the endplates were measured by indentation *** two groups of data were compared by one-way *** the experimental animals stood for 17 weeks,The experimental group showed the characteristics of early disc *** microstructure of the degenerative group showed that the end plate mineralization degree was higher,the bone mass was larger,and the number and thickness of bone trabeculae were *** results of indentation test showed that the mechanical properties of the degeneration group were enhanced,and the lower endplate was obviously *** successfully established a model of human disc degeneration with non invasive trauma and more consistent with the process of human disc degeneration through the standing *** the experimental group,the internal structure of the endplate was dense and pore distance was *** change of bone mesoscopic structure further affects the endplate,resulting in the enhancement of the mechanical properties of the endplate after intervertebral disc *** reduction of the pore distance and the narrowing of the internal channel structure of the endplate also hinder the nutrition supply of the intervertebral disc,which ma

关键词： Vertebral endplate Biomechanics Intervertebral disc degeneration model Mechanical properties Mesoscopic structure

Automatic quantification of morphology on magnetic resonance images of the proximal tibia

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Medicine in Novel Technology and Devices 2023年第1期17卷 69-80页

作者： Dongdong He Yuan Guo xushu zhang Changjiang Wang Zihui Zhao Weiyi Chen Kai zhang Binping Ji College of Biomedical Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina Department of Engineering and Design University of SussexSussex HouseBrightonBN19RHUnited Kingdom Shanxi Hua Jin Orthopaedic Hospital Taiyuan030400ShanxiChina

The morphological quantification of the proximal tibia of the knee joint is important in knee *** knowledge of these parameters provides the basis for design of the tibial prosthesis and its ***,a prosthesis that is suitable for the morphological characteristics of Chinese knees is *** this paper,a deep learning automatic network framework is designed to achieve automatic segmentation and automatic quantitative analysis of magnetic resonance images of the *** enhanced feature fusion network structure is designed,including high and low-level feature fusion path modules to create accurate segmentation of the tibia.A new method of extracting feature points and lines from outline contours of the proximal tibia is designed to automatically calculate six clinical morphological linear parameters of the tibia in *** final result is an automatic visualisation of the tibial contour and automated extraction of tibial morphometric *** of the results from our system against a gold standard obtained by manual processing by expert clinicians showed the Dice coefficient to be 0.97,the accuracy to be 0.98,and the correlation coefficients for all six morphological parameters of the automatic quantification of the tibia are above *** gender-specific study found that the values of the proximal tibial linear parameters of internal and external tibial diameter,anterior and posterior diameter,lateral plateau length,lateral plateau width,medial plateau length,and medial plateau width in male patients are significantly greater than in female patients(all P values<0.01).The results enrich the use of deep learning in medicine,providing orthopaedic specialists with a valuable and intelligent quantitative tool that can assess the progression and changes in osteoarthritis of the knee joint.

关键词： Proximal tibia Feature fusion Quantitative analysis Automatic segmentation Intelligent quantification

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重构中国式形而上学

文艺理论研究 2014年第3期34卷 64-72,115页

作者：张旭曙复旦大学中文系

形而上学不死源于它的属人本性。当代语境下提出重构中国式形而上学的主张基于社会主义现代化伟大实践的内在必然要求,它是建设中国新文化传统的重要组成部分。重构中国式形而上学的不息动力在于思想者的批判精神、创新勇气。对形而上... 详细信息

形而上学不死源于它的属人本性。当代语境下提出重构中国式形而上学的主张基于社会主义现代化伟大实践的内在必然要求,它是建设中国新文化传统的重要组成部分。重构中国式形而上学的不息动力在于思想者的批判精神、创新勇气。对形而上学进行认识论批判、如何看待先验理性(形式)、构建以人(法权人格)为核心的自由理想的精神家园是重构中国式形而上学的三项主要课题。当代中国式形而上学的构建任重而道远。

关键词：反形而上学中国式形而上学重构人的本性

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形式本性及其与西方思想的本源关联探析

南京社会科学 2012年第8期 132-137页

作者：张旭曙复旦大学中文系

形式自始便与数学、物理学、逻辑学、形而上学有关,具有歧义丛生、一语多名的特点,故而形式的本质属性不是单一不变的,也无法用属加种差的方法给形式下一个内涵、外延确切的规范、严整的定义。形式的本性源于逻辑,逻辑具有纯形式特征,... 详细信息

形式自始便与数学、物理学、逻辑学、形而上学有关,具有歧义丛生、一语多名的特点,故而形式的本质属性不是单一不变的,也无法用属加种差的方法给形式下一个内涵、外延确切的规范、严整的定义。形式的本性源于逻辑,逻辑具有纯形式特征,逻辑学追求可理解性的最普遍法则,达成的真理是关于理性世界的形式真理。形式、理性、逻辑、数学不仅仅是思维工具、科学方法,更在形而上学和认识论上支撑、规约着西方思想的重要概念、命题、课题、特性。由于形式范畴具有复杂性、含混性、流动性的品格,它的恰切定性应当为既是元范畴又不是元范畴。形式是型塑、彰显西方文化精神特质(两个世界、本质之学、主客两分、因果目的、精密分析等)的宿根性因素之一。

关键词：西方精神形式逻辑形而上学元范畴

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西方美学中的“形式”:一个观念史的理解

学海 2005年第4期 108-111页

作者：张旭曙复旦大学中文系

倘若把西方美学范畴体系比作一张由形色大小各异的范畴编织而成的错综复杂的巨大的思维之网,那么毫无疑问,在一批最古老、最持久的强力范畴中,形式当属耀眼的纽结之一.我们引两段话印证形式的显赫身份:日内瓦学派批评家让·鲁塞断言,关... 详细信息

倘若把西方美学范畴体系比作一张由形色大小各异的范畴编织而成的错综复杂的巨大的思维之网,那么毫无疑问,在一批最古老、最持久的强力范畴中,形式当属耀眼的纽结之一.我们引两段话印证形式的显赫身份:日内瓦学派批评家让·鲁塞断言,关于文艺现象的一切重大问题都存在大量无把握的和针锋相对的意见,"但如果说有一个概念挑起了矛盾或分歧,那正是形式这个中心概念."①李斯托威尔写道:"只要略微瞥一下美学的历史,就可以知道形式论的重要地位了.从希腊时代一直到今天,它一再居于显著的地位."②

关键词：西方国家美学范畴体系形式论语义

朱光潜诗歌阅读理论蠡测——兼谈推进中国传统诗歌的理论研究

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中国文化研究 2017年第1期 124-135页

作者：张旭曙复旦大学中文系

朱光潜诗论的实质是研究富于创造性的阅读活动,其核心内容是诗境,即情趣和意象的交融而创造的超时空的理想世界。"见"的创造性着重于意象,"诵"的创造性体现在情趣。朱光潜诗歌阅读理论给予传统诗论命题"意在言外"的内涵与特点以新颖的... 详细信息

朱光潜诗论的实质是研究富于创造性的阅读活动,其核心内容是诗境,即情趣和意象的交融而创造的超时空的理想世界。"见"的创造性着重于意象,"诵"的创造性体现在情趣。朱光潜诗歌阅读理论给予传统诗论命题"意在言外"的内涵与特点以新颖的语言学的解释,用"无言之美"为读者的无限的想象活动奠定人生论、宇宙论的根基;又对诗歌理解活动中的难懂(隐)易懂(显)及情趣上的个别差异作了心理学的分析。超越朱光潜诗论,推进中国传统诗歌的理论研究,应当对建立诗学科学的形上学(宇宙论)、认识论(主—客关系)、语言论的基础及三者之间的错综复杂关系进行详实的论述。

关键词：诗境创造性的“见” 诵诗无言之美显与隐超越朱光潜诗论

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实施研究性学习策略培养学生科学素养

化学教学 2005年第4期 20-21,38页

作者：张绪姝北京市六十三中学北京100053

针对现行中学化学教材中大部分实验是验证性实验,难度小,不利于学生在实验中产生深入思考,在思考中自主构建新的认知体系,本文提出在化学课堂教学中,要努力挖掘可用素材,创设以探究式教学模式为主的实验研究机会,应用自上而下的教学策略... 详细信息

针对现行中学化学教材中大部分实验是验证性实验,难度小,不利于学生在实验中产生深入思考,在思考中自主构建新的认知体系,本文提出在化学课堂教学中,要努力挖掘可用素材,创设以探究式教学模式为主的实验研究机会,应用自上而下的教学策略,培养学生创新精神。

关键词：学习策略科学素养学生验证性实验化学教材课堂教学教学模式教学策略自上而下创新精神研究机中学难度素材