Autor: Parnianpour, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of different material theories used in a FE model of a lumbar segment motion
Autorzy:: Gohari, E.
Nikkhoo, M.
Haghpanahi, M.
Parnianpour, M.
Powiązania:: https://bibliotekanauki.pl/articles/307482.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: creep
dynamic loading
finite element method
lumbar motion segment
poroelastic
viscoelastic
pełzanie
porosprężystość
lepkosprężystość
metoda elementów skończonych
Opis:: In this study, a nonlinear poroelastic model of intervertebral disc as an infrastructure was developed. Moreover, a new element was defined consisting a disc (Viscoelastic Euler Beam Element) and a vertebra (Rigid Link) as a unit element. Using the new element, three different viscoelastic finite element models were prepared for lumbar motion segment (L4/L5). Prolonged loading (short-term and longterm creep) and cyclic loading were applied to the models and the results were compared with results of in vivo tests. Simplification of the models by using the new element leads to reduction of the runtime of the models in dynamic analyses to few minutes without losing the accuracy in the results.
Źródło:: Acta of Bioengineering and Biomechanics; 2013, 15, 2; 33-41
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Effects of Experience and the Presence of a Scaffold Handrail on Postural and Spinal Stability in Construction Workers
Autorzy:: Min, S. N.
Kim, J. Y.
Parnianpour, M.
Powiązania:: https://bibliotekanauki.pl/articles/91154.pdf
Data publikacji:: 2014
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: fall
low back pain
postural stability
lumbar stability
construction
injury
ból pleców
stabilność postawy
pracownicy budowlani
rusztowanie budowlane
Opis:: The goal of this study was to quantify the effect of experience and handrail presence on trunk muscle activities, rotational spinal stiffness and postural stability of construction workers. We evaluated spinal stability, and objective and subjective postural stability in 4 expert and 4 novice construction workers who were performing a manual task in a standing position on a scaffold, with and without a safety handrail. Center of pressure was computed using measurements taken with insole pressure transducers. Muscle activity was monitored usingsurface electrodes placed on 8 trunk muscles that predicted active trunk rotational stiffness. Standard deviations of the center of pressure, back muscle activity and spinal stiffness were greater in novices and in the absence of a handrail. We infer that the risk of a fall due to postural and spinal instability may be greater with a lower level of experience and in the absence of a safety handrail.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2014, 20, 3; 491-502
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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