Many problems of physical sciences and engineering are modelled by singular
boundary value problems. In this paper, the variational iteration method (VIM)
is used to study the time-dependent singular Emden-Fowler equations. This method
overcomes the difficulties of singularity behavior. The VIM reveals quite a
number of features over numerical methods that make it helpful for singular and
nonsingu... hiện toàn bộ
Today’s automobile manufacturers are increasingly using lightweight materials to
reduce weight; these include plastics, composites, aluminium, magnesium alloys,
and also new types of high strength steels. Many of these materials have limited
strength or ductility, therefore in many cases the rupture being serious
consequences during crashes, underscore Picketta et al. in their studies.
Automotive ... hiện toàn bộ
In this paper the universal model of dynamic short-circuit arcs is presented for
simulation of earth-fault in medium voltage networks. The model describes the
entire arc short-circuit process: the ignition, the burning stage, the arc
extinction and the increasing recovery voltage. Four alternative choices of the
characteristics of the static arc are implemented and compared. Simulation
results in ... hiện toàn bộ
In this paper, a single-stage deep sub-micron wideband amplifier (LNA) using a
reactive resonance tank and passive port-matching techniques is demonstrated
operating in the microwave frequency range (K band). A novel power-efficient
bandwidth (BW) regulation technique is proposed by incorporating a small
impedance in the resonance tank of the amplifier configuration. It manifests a
forward gain in... hiện toàn bộ
We produced regenerative artificial bone material and bone parts using
vacuum-sintered bodies of a novel apatite called “Titanium medical apatite
(TMA®)” for biomedical applications. TMA was formed by chemically connecting a
Ti oxide molecule with the reactive [Ca10(PO4)6] group of Hydroxyapatite (HAp).
The TMA powders were kneaded with distilled water, and solid cylinders of
compacted TMA were ma... hiện toàn bộ
In this paper, values for the maximum opening crack stress and its distance from
crack tip are determined for various elastic-plastic materials for centre
cracked plate in tension (CC(T) specimen) are presented. Influences of yield
strength, the work-hardening exponent and the crack length on the maximum
opening stress were tested. The author has provided some comments and
suggestions about modell... hiện toàn bộ
Meriem Ammar, Zied Driss, Wajdi Chtourou, Mohamed S. Abid
The aim of this paper is to study the effect of baffles length on the turbulent
flows in stirred tanks. The hydrodynamic behaviour induced by a Rushton turbine
(RT6) is numerically predicted by solving the Navier-Stokes equations in
conjunction with the Renormalization Group (RNG) of the k-ɛ turbulence model.
These equations are solved by a control volume discretization method. The
numerical resul... hiện toàn bộ
This paper proposes an approach for integrating Plug-In Hybrid Electric Vehicles
(PHEV) to an existing residential photovoltaic system, to control and optimize
the power consumption of residential load. Control involves determining the
source from which residential load will be catered, where as optimization of
power flow reduces the stress on the grid. The system built to achieve the goal
is a co... hiện toàn bộ
The influence of turbulence models on the 3D unsteady flow in a combustion
chamber with a central bluff body is analyzed. Three different turbulence models
are used (realizable k-ε, Reynolds Stress Model and Large Eddy Simulation) and a
comparison is made on the evolution of the velocity field over time. The
numerical simulation of the gas flow in the combustion chamber was performed
using FLUENT ... hiện toàn bộ
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