Results from a numerical study examining micro-/macrorelations linking local geometry parameters to sound absorption properties are presented. For a hexagonal structure of solid fibers, the porosity phi, the thermal characteristic length Lambda('), the static viscous permeability k(0), the tortuosity alpha(infinity), the viscous characteristic length Lambda, and the sound absorption coefficient...

materials and methods: one hundred and thirty five mesial root canals of mandibular first and second molar teeth were selected. access cavities were prepared. after inserting a k-file size #10 into each canal, radiographs were taken. canal curvature was determined by measuring the schneider angle, canal access angle, as well as the canal radius, length, height and curvature starting distance on...

Abstract Previous numerical simulations have shown that strong winds can be produced in the hot accretion flows around black holes. Most of those studies focus only on region close to central hole; therefore it is unclear whether wind production stops at large radii Bondi radius. Bu et al. (2016) studied flow radius presence nuclear star gravity. They find that, when stars gravity important–com...

Let S be any bounded linear operator defined on a complex Hilbert space id="M2"> H . In this paper, we present some numerical radius inequalities involving the generalized Aluthge transform to attain upper bounds for radius. Numerical computations are carried out particular cases of...

Consider a system of linear algebraic equations with a nonsingular n by n matrix A. When solving this system with GMRES, the relative residual norm at the step k is bounded from above by the so called ideal GMRES approximation. This bound is sharp (it is attainable by the relative GMRES residual norm) in case of a normal matrix A, but it need not characterize the worstcase GMRES behavior if A i...

A hemispherical barotropic model of global-3cale atmospheric motions is studied in a planar approximation using three K (Bessel)-vortices of equal strength y and length scale g" to represent the sub-tropical semipermanent high pressure systems. In equilibrium tl-3se anticyclonic vortices are equally spaced on a latit ade circle of radius a. One K -vortex of strength -y is used o 0 ' o to simula...

Introduction: The purpose of this in-vitro study was to compare shaping ability of NiTi rotary Mtwo and FlexMaster with stainless steel hand K-Flexofile in curved root canals of extracted teeth. Materials and Methods: Mesiobuccal canals of 45 mandibular molar teeth were balanced into three groups of 15 each, with respect to the Schneider angle, canal access angle, height, dis-tance and radiu...