scholarly journals Bone Remodelling Model Incorporating Both Shape and Internal Structure Changes by Three Different Reconstruction Mechanisms. A Lumbar Spine Case

2016 ◽  
Vol 63 (4) ◽  
pp. 549-563
Author(s):  
Paweł Wymysłowski ◽  
Tomasz Zagrajek
Keyword(s):  
Internal Structure ◽  
Bone Remodelling ◽  
Spinal Segment ◽  
Element Analysis ◽  
Site Specific ◽  
Structure Changes ◽  
Ansys System ◽  
Artificial Intervertebral Disc ◽  
Lumbar Spinal ◽  
Adaptive Elasticity

AbstractThe paper presents a method of analysis of bone remodelling in the vicinity of implants. The authors aimed at building a model and numerical procedures which may be used as a tool in the prosthesis design process. The model proposed by the authors is based on the theory of adaptive elasticity and the lazy zone concept. It takes into consideration not only changes of the internal structure of the tissue (described by apparent density) but also surface remodelling and changes caused by the effects revealing some features of “creep”. Finite element analysis of a lumbar spinal segment with an artificial intervertebral disc was performed by means of the Ansys system with custom APDL code. The algorithms were in two variants: the so-called siteindependent and site-specific. Resultant density distribution and modified shape of the vertebra are compared for both of them. It is shown that this two approaches predict the bone remodelling in different ways. A comparison with available clinical outcomes is also presented and similarities to the numerical results are pointed out.

Application of the Software System of Finite Element Analysis for the Simulation and Design Optimization of Solar Photovoltaic Thermal Modules

2020 ◽  
pp. 106-131 ◽  
Author(s):  
Vladimir Panchenko ◽  
Sergey Chirskiy ◽  
Valeriy Vladimirovich Kharchenko
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Solar Cells ◽  
Heat Removal ◽  
Operating Conditions ◽  
Temperature Fields ◽  
Thermal Mode ◽  
Solar Photovoltaic ◽  
Element Analysis ◽  
Ansys System

The chapter discusses the simulation of thermal operating conditions and the optimization of the design of solar photovoltaic thermal modules. As a realization of the developed method, two photovoltaic thermal modules with one-sided solar cells with one-sided heat removal and two-sided solar cells with two-sided heat removal are presented. The components of the developed models of solar modules must be optimized on the basis of the required indicators of the thermal mode of operation of the modules. For this task, a method has been developed for visualizing thermal processes using the Ansys system of finite element analysis, which has been used to research thermal modes of operation and to optimize the design of the modules created. With the help of the developed method, the temperature fields of the module components, coolant velocity and its flow lines in the developed models of a planar photovoltaic thermal roofing panel and a concentrator photovoltaic thermal two-sided module are visualized.

Contributions of Flexion–Extension Cyclic Loads to the Lumbar Spinal Segment Stability Following Different Discectomy Procedures

Spine ◽  
2004 ◽  
Vol 29 (3) ◽  
pp. E39-E46 ◽  
Author(s):  
Hiroshi Kuroki ◽  
Vijay K. Goel ◽  
Scott A. Holekamp ◽  
Nabil A. Ebraheim ◽  
Shinichiro Kubo ◽  
...  
Keyword(s):  
Cyclic Loads ◽  
Spinal Segment ◽  
Flexion Extension ◽  
Lumbar Spinal

Surgical instrumentation for the in vivo determination of human lumbar spinal segment stiffness and viscoelasticity

2009 ◽  
Vol 31 (9) ◽  
pp. 1063-1068 ◽  
Author(s):  
Sveva Ambrosetti-Giudici ◽  
Alois Pfenniger ◽  
Michael H. Krenn ◽  
Wolfgang P. Piotrowski ◽  
Stephen J. Ferguson ◽  
...  
Keyword(s):  
Spinal Segment ◽  
Surgical Instrumentation ◽  
Lumbar Spinal

Using of the Ultrasonic Method for Alkali-Silica Reaction Detection in the Cement Mortar

2021 ◽  
Vol 321 ◽  
pp. 29-35
Author(s):  
Dimitrii Gusak ◽  
Jiří Brožovský ◽  
Rudolf Hela
Keyword(s):  
Internal Structure ◽  
Propagation Velocity ◽  
Cement Mortar ◽  
Ultrasonic Method ◽  
Alkali Silica Reaction ◽  
Extensive Investigation ◽  
Internal Corrosion ◽  
Impulse Propagation ◽  
Structure Changes

The alkali–silica reaction (ASR) causes internal corrosion of concrete. The aim of this work is to verify the possibility of ultrasonic method in detection of concrete internal structure changes, which were initiated by the alkali-silica reaction. For this purpose, we prepared samples that contained aggregates of two types, namely one with 98% of SiO2 content and one with a greywacke. The dependence of ultrasonic impulse propagation velocity on the changes in the structure of mortars containing aggregates from these rocks was researched. The results of this work are not unambiguous yet and therefore it is necessary to carry out more extensive investigation with using of other methods that will allow to examine changes in the internal structure of composites more detailed.

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