INTRODUCTION Accurate, continuous, left ventricular stroke volume (SV) measurements can convey large amounts of information about patient hemodynamic status and response to therapy. However, direct measurements are highly invasive in clinical practice, and current procedures for estimating SV require specialized devices and significant approximation. METHOD This study investigates the accurac...

Plant petioles and stems are hierarchical cellular structures, displaying geometrical features defined at multiple length scales. One or more of the intermediate hierarchical levels consists of tissues in which the cellular distribution is quasi-random, a factor that affects the elastic properties of the tissues. The current work focuses on the finite element analysis (FEA) of the constituent t...

Multiscale optimization is an attractive research field recently. For the most of optimization tools, design parameters should be updated during a close loop. Therefore, a simple Python code is programmed to obtain effective properties of Representative Volume Element (RVE) under Periodic Boundary Conditions (PBCs). It can compute the mechanical properties of a composite with a periodic structu...

In this paper a composite plate with similar unidirectional fibers is considered. Assuming orthotropic structure, theory of elasticity is used for investigating the stress concentration. Also, complex variable functions are utilized for solving the plane stress problems. Then the effective characteristics of this plate are studied numerically by using ANSYS software. In this research a volume e...

The mechanical behavior of TiO2 nanoparticle-reinforced resin-based dental composites was characterized in this work using a three-dimensional nanoscale representative volume element. The impacts of nanoparticle volume fraction, aspect ratio, stiffness, and interphase zone between the resin matrix and nanoparticle on the bulk properties of the composite were characterized. Results clearly demon...

Carbonate reservoirs commonly have significant heterogeneity and complex pore systems due to the multi-scale characteristic. Therefore, it is quite challenging predict petrophysical properties of such based on restricted experimental data. In order study size representative elementary volume (REV) vuggy dolostones, a total 26 samples with sizes ranging from micrometers centimeters were collecte...

An i m p o r t a n t t a s k a s s o c i a t e d w i t h r e s e r v o i r s imu la t ion i s t h e deve lopmen t o f a t e c h n i q u e t o model a l a r g e number o f f r a c t u r e s w i t h a s i n g l e descr ip t ion . R e p r e s e n t a t i v e e l e m e n t s m u s t b e d e v e l o p e d b e f o r e r e s e r v o i r s c a l e s i m u l a t i o n s c a n a d e q u a t e l y a d d r...

The critical state of a granular material made rounded tetrahedral particles is studied through DEM simulations triaxial compressions. A minimum number 7,500 first obtained as the representative volume element (RVE) for present simulations. Then, macroscopic line (CSL) shown to be increasing in (stress, density) space low confining pressures. Such an unexpected behaviour explained by existence ...