نتایج جستجو برای: lateral bending

تعداد نتایج: 152110  

In this paper, the laser bending process of a circular tube made of mild steel has been investigated experimentally. For this purpose, the effects of the irradiating length and the number of irradiating passes on the main bending angle of a laser bent tube are studied. In addition, the main defects of the laser tube bending process such as lateral bending angle, ovality and thickness variation ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

seismic retrofit strategies have been developed in the past few decades following the introduction of new seismic provisions and the availability of advanced materials and methods. it can be observed that new approaches to deal with more lateral forces are more innovative and more energy absorbent. in line with this, there is a growing trend toward the use of steel shear walls as a system with ...

Journal: :international journal of advanced design and manufacturing technology 0
khatereh hajizadeh ian gibson gabriel liu

normal 0 false false false en-us x-none fa microsoftinternetexplorer4 in this paper, a fully discretized bio-fidelity simulation model for bio-mechanical (kinematic) analysis of scoliosis for various patients was developed to analyze forces on vertebrae, loads acting on the intervertebral disc, corresponding angles between vertebrae, and tension in the spine muscles during lateral bending. it w...

Journal: :The Journal of experimental biology 1995
Anderson Shultz Jayne

For centipedes moving steadily on a treadmill at speeds of 0.5, 1.0 and 1.5 L s-1, where L is body length, we obtained video tapes of movement that were synchronized with electromyograms (EMGs) from lateral flexor muscles at six standardized longitudinal positions. Field-by-field analysis of video tapes revealed posteriorly propagated waves of bending at all speeds. Muscle activity was also pro...

2017
Chen He Michael Kai-Tsun To Jason Pui-Yin Cheung Kenneth Man-Chee Cheung Chi-Kwan Chan Wei-Wei Jiang Guang-Quan Zhou Kelly Ka-Lee Lai Yong-Ping Zheng Man-Sang Wong

BACKGROUND Spinal flexibility is an essential parameter for clinical decision making on the patients with adolescent idiopathic scoliosis (AIS). Various methods are proposed to assess spinal flexibility, but which assessment method is more effective to predict the effect of orthotic treatment is unclear. OBJECTIVE To investigate an effective assessment method of spinal flexibility to predict ...

Journal: :Bio-medical materials and engineering 2015
Zhenhua Liao Ting Pu Hongsheng Gu Weiqiang Liu

To compare the biomechanical characters of three-level anterior cervical fusion and hybrid constructs by measuring coupled motion changes of the cervical spine, Eighteen adult human cadaveric cervical spines were biomechanically investigated under eccentric displacement control in lateral bending and axial rotation by measuring vertebral motion (X, Y, Z -axis).The 3DPD condition displayed simil...

Journal: :Journal of Experimental Biology 1992

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده مهندسی عمران 1387

هدف اصلی این تحقیق بررسی کمانش موضعی صفحات مستطیلی با تغییرات ضخامت در طول است. تغییرات ضخامت به صورت پله ای و با پرش های ناگهانی در طول می باشد. با توجه به اینکه حل مسایل صفحات با روش های تحلیلی برای بعضی شرایط تکیه گاهی و بارگذاری معمولاً سخت و طولانی است، استفاده از روش های عددی مناسب تر به نظر می رسد. روش نوار محدود را می توان یکی از روش های عددی کارا برای تحلیل مسایل خمش و پایداری صفحات دان...

2014
Xi Wang Jing Xu Yuexing Zhu Jiukun Li Si Zhou Shunliang Tian Yucheng Xiang Xingmo Liu Ying Zheng Tao Pan

OBJECTIVE The objective of this biomechanical study was to evaluate the stability provided by a newly developed shape memory alloy hook (SMAH) in a cadaveric transforaminal lumbar interbody fusion (TLIF) model. METHODS Six human cadaveric spines (L1-S2) were tested in an in vitro flexibility experiment by applying pure moments of ±8 Nm in flexion/extension, left/right lateral bending, and lef...

Journal: :Turkish neurosurgery 2012
Shujie Tang

AIM To determine whether transforaminal lumbar interbody fusion aggravate adjacent segmental degeneration more adversely than anterior lumbar interbody fusion. MATERIAL AND METHODS A normal finite element model, an anterior lumbar interbody fusion model and a transforaminal lumbar interbody fusion model of L3-5 were developed. 800 N compressive loading plus 10 Nm moments simulating flexion, e...

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