نتایج جستجو برای: fiber angle

تعداد نتایج: 258005  

Journal: :Magnetic resonance imaging 2007
Ed X Wu Yin Wu Haiying Tang Jie Wang Jian Yang Man C Ng Edward S Yang Carmen W Chan Shuguang Zhu Chu-Pak Lau Hung-Fat Tse

The purpose of this study was to investigate myocardial fiber pathway distribution in order to provide supplemental information on myocardial fiber architecture and cardiac mechanics. Diffusion tensor imaging (DTI) with medium diffusion resolution (15 directions) was performed on normal canine heart samples (N=6) fixed in formalin. With the use of diffusion tensor fiber tracking, left ventricle...

Journal: :Optics express 2015
Ivan-Lazar Bundalo Kristian Nielsen Ole Bang

We report on an incidence angle influence on inscription of the Fiber Bragg Gratings in Polymethyl methacrylate (PMMA) microstructured polymer optical fibers. We have shown experimentally that there is a strong preference of certain angles, labeled ГK, over the other ones. Angles close to ГK showed fast start of inscription, rapid inscription and stronger gratings. We have also shown that grati...

Journal: :International Journal for Simulation and Multidisciplinary Design Optimization 2021

The current study focussed on analysing natural frequency and damping of laminated composite beams (LCBs) by varying fiber angle, aspect ratio, material property boundary conditions. Ritz method with displacement field based the shear normal deformable theory is used modal calculated using strain energy method. Effects symmetric angle-ply cross-ply, anti balanced quasi-isotropic lay up schemes ...

Journal: :Journal of applied physiology 2011
Usha Sinha Shantanu Sinha John A Hodgson Reggie V Edgerton

The orientation of muscle fibers influences the physiological cross-sectional area, the relationship between fiber shortening and aponeurosis shear, and the total force produced by the muscle. Such architectural parameters are challenging to determine particularly in vivo in multicompartment structures such as the human soleus with a complex arrangement of muscle fibers. The objective of this s...

2011
Yu Tzu Wu Eric Fujiwara Carlos Kenichi Suzuki

Due to the arising importance and widespread role of robotic systems, it is fundamental the development of high-performance position sensors. There are several existing methods to determine position of anthropomorphic manipulators. However, they present limitations, such as vulnerability to electromagnetic fields or application of mechanical load to the system. Concerning these problems, an opt...

2016
Koji Watanabe Satoru Otsuki Takushi Hisa Masanori Nagaoka

[Purpose] The tendinous inscription divides the semitendinosus muscle into the proximal and distal compartments. It was hypothesized that there are functional differences between those compartments. [Subjects and Methods] Seven adult males performed knee flexion and hip extension in the prone position. An ultrasound device measured the decrease in the length of muscle fibers in the two compartm...

Journal: :Journal of biomedical optics 2014
Hermann Lin Meng-Chun Kao Chih-Ming Lai Jyun-Cin Huang Wen-Chuan Kuo

A swept source (SS)-based circular-state (CS) polarization-sensitive optical coherence tomography (PS-OCT) constructed entirely with polarization-maintaining fiber optics components is proposed with the experimental verification. By means of the proposed calibration scheme, bulk quarter-wave plates can be replaced by fiber optics polarization controllers to, therefore, realize an all-fiber opti...

2015
Roshanak Honarpishe Amir Hoshang Bakhtiary Gholamreza Olyaei

Background: Imbalance between the vastus medialis oblique (VMO) muscle and the vastus lateralis oblique (VTO) Vastus lateralis has been thought to be a primary cause of abnormal patellar tracking, possibly leading to patellofemoral pain syndrome (PFPS). Objectives: The purpose of this study was to investigate the effect of quadriceps muscle strengthening exercises on the ratio of VMO to VL obli...

Journal: :Bioinspiration & biomimetics 2013
Emanuel Azizi Thomas J Roberts

A fundamental feature of pennate muscles is that muscle fibers are oriented at an angle to the line of action and rotate as they shorten, becoming more oblique throughout a contraction. This change in fiber orientation (pennation angle) can amplify the shortening velocity of a fiber and increase output velocity of the muscle. The velocity advantage resulting from dynamic changes in pennation an...

2003
ROBERT S. RENEMAN

ARTS, THEO, PIETER C. VEENSTRA, AND ROBERT S. RENEMAN. Epicardial deformation and left ventricular walL mechanics during ejection in the dog. Am. J. Physiol. 243 (Heart Circ. Phvsiol. 12): H379-H390, 1982.-Significant differences between kpicardial and endocardial systolic stress in the wall of the left ventricle (LV) have been predicted by various models of LV mechanics. Yet a model incorporat...

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