4,867 research outputs found
Quasi-TEM modes in rectangular waveguides: a study based on the properties of PMC and hard surfaces
Hard surfaces or magnetic surfaces can be used to propagate quasi-TEM modes
inside closed waveguides. The interesting feature of these modes is an almost
uniform field distribution inside the waveguide. But the mechanisms governing
how these surfaces act, how they can be characterized, and further how the
modes propagate are not detailed in the literature. In this paper, we try to
answer these questions. We give some basic rules that govern the propagation of
the quasi-TEM modes, and show that many of their characteristics (i.e. their
dispersion curves) can be deduced from the simple analysis of the reflection
properties of the involved surfaces
Numerical Investigation of Evaporation Induced Self-Assembly of Sub-Micron Particles Suspended in Water
Self-assembly of sub-micron particles suspended in a water film is
investigated numerically. The liquid medium is allowed to evaporate leaving
only the sub-micron particles. A coupled CFD-DEM approach is used for the
simulation of fluid-particle interaction. Momentum exchange and heat transfer
between particles and fluid and among particles are considered. A history
dependent contact model is used to compute the contact force among sub-micron
particles. Simulation is done using the open source software package CFDEM
which basically comprises of two other open source packages OpenFOAM and
LIGGGHTS. OpenFOAM is a widely used solver for CFD related problems. LIGGGHTS,
a modification of LAMMPS, is used for DEM simulation of granular materials. The
final packing structure of the sub-micron particles is discussed in terms of
distribution of coordination number and radial distribution function (RDF). The
final packing structure shows that particles form clusters and exhibit a
definite pattern as water evaporates away
Hyers-Ulam stability for coupled random fixed point theorems and applications to periodic boundary value random problems
In this paper, we prove some existence, uniqueness and Hyers-Ulam stability results for the coupled random fixed point of a pair of contractive type random operators on separable complete metric spaces. The approach is based on a new version of the Perov type fixed point theorem for contractions. Some applications to integral equations and to boundary value problems are also given.Ministerio de Economía y Competitividad (MINECO). EspañaEuropean Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)Junta de Andalucí
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