The paper explores an omnidirectional antenna configuration composed of a reflector fed by shaped dielectric lens associated with coaxial TEM horn. A simple formula describes the shape obtained applying Fermat’s principle to control rays’ caustic emerging from interface. Based on geometrical optics (GO) principles, synthesis technique defines radiation pattern in vertical plane. Concatenated co...

Abstract We investigate the statistics of phase fluctuations an acoustic wave propagating through a turbulent flow in line sight (LOS) configuration. Experiments are performed on closed von Kármán swirling whose boundaries maintained at constant temperature. In particular, we analyze root mean square (RMS) and power spectrum density (PSD) fluctuations. A model is developed analytical prediction...

A graph G admitting a 2-factor is pseudo isomorphic if the parity of number cycles in all its 2-factors same. In Abreu et al. (2008) some authors this note gave partial characterisation bipartite cubic graphs and conjectured that K3,3, Heawood Pappus are only essentially 4-edge-connected ones. Goedgebeur (2015) Jan computationally found on 30 vertices which bipartite, cyclically 6-edge-connecte...

Magnetically arrested disk (MAD) has been argued as the key accretion phase to realize formation of relativistic jets. However, due lack magnetic field measurements accreting systems, MAD not observationally confirmed yet. Here we propose that a strong accompanied by would induce Zeeman splitting relativistically broadened Fe K$\alpha$ fluorescence lines in X-ray binaries and active galactic nu...

This work presents the results of numerical modeling Karman vortex street generation performed with ANSYS/FLUENT package application. The influence mechanical elements located downstream bluff body on frequency has been found during earlier laboratory investigations. Five various geometrical configurations have tested. Considerable differences in pictures distributions pressure, horizontal and ...

We study convexity and symmetry of central configurations in the five body problem when three masses ara located at vertices an equilateral triangle, that we call Lagrange plus two configurations. First, prove bodies out triangle cannot be placed on certain lines. Next, give a geometrical characterization such sense as Dziobek, describe admissible regions where remaining can placed. Furthermore...

In this study, the Flow-Induced Vibration (FIV) of pivoted cylinders (at a distance) is numerically investigated as potential source energy harvesting. particular, we investigate effect pivot point placement, arm length, and natural frequency on FIV performance six different cross sections in Reynolds number around 1000. All have similar mass, area, moment inertia to eliminate non-geometrical e...

In this present work, simulations of 20 kW furnace were carried out with hydrogen-enriched methane mixtures, to identify optimal geometrical configurations and operating conditions operate in flameless combustion regime. The objective work is show the advantages for fuels limits current typical industrial designs these mixtures. performances a semi-industrial chamber equipped self-recuperative ...

In the current research project, two-dimensional numerical simulations are conducted to analyze effects of geometrical configuration on flow structures and thermal performances subcooled boiling. The CFD carried out in two different configurations (straight periodic constriction expansion) a minichannel mounted vertically at four mass fluxes (500 kg/m2s; 836.64 1170 2535 kg/m2s). present predic...

In this paper, we reviewtwo approaches that can describe, in a geometrical way, the kinematics of particles are affected by Planck-scale departures, named Finsler and Hamilton geometries. By relying on maps connect spaces velocities momenta, discuss properties configuration phase induced these two distinct particular, exemplify approach considering so-called q-de Sitter-inspired modified disper...