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Remodelling of material structure in aortic valve leaflet

Patralski K., Konderla P.

Acta of Bioengineering and Biomechanics

2015

Vol. 17, no. 2

63--72

Purpose: The goal of this study is to model changes in fibre content in aortic valve leaflet material due to mechanical stimuli. Methods: The fibre remodelling process is associated with the redistribution of the internal forces acting in the shell. The process is characterized by the occurrence of extreme stresses and strains. The load distribution function is asymmetrical. The optimization problem has been assigned the task of transferring the load imposed on the leaflet. The density of the fibres per unit surface of the middle shell was assumed to be proportional to the shell thickness, which means that fibre density along the normal direction is constant over the entire shell. Results: The model of valve leaflet loading is the distribution of the pressure generated on the leaflet shell surface by the flowing fluid. The algorithm for the redistribution of the leaflet material mass made it possible to distinguish two regions of enhanced thickness in the leaflet shell. One was localized between the commissures along the leaflet attachment, the other one in the middle part of the leaflet at the level of the commissures. A reduction in shell thickness is observed in the middle part of the leaflet, above the point of its attachment to the aorta. Conclusions: The distribution of the thickness field obtained corroborates the findings of the study reported elier. Our study on the remodelling of the valve leaflet entailed the application of the stress criterion, which visibly upgraded the functioning of the valve by improving its mechanical and hemodynamic parameters.

Methods of locating office functions exemplified by designs realized in London

Zawada-Pęgiel K.

Czasopismo Techniczne. Architektura

2014

R. 111, z. 3-A

173--189

This paper draws the reader’s attention to the timeliness of the problem of developing office functions and its influence on the space of a city. It also presents the contemporary manners of locating office functions exemplified by selected designs realized in London. This paper briefly characterizes specific implementations as well as indicates directions for the development of the agglomeration in the context of office functions.

W artykule zwrócono uwagę na aktualność problemu rozwoju funkcji biurowych oraz jej wpływu na przestrzeń miasta. Przedstawiono także współczesne sposoby rozmieszczenia funkcji biurowych na przykładzie Londynu. Scharakteryzowano w zwarty sposób konkretne realizacje oraz wskazano kierunki rozwoju aglomeracji w kontekście funkcji biurowej.