Central European Journal of Engineering

  2081-9927

  1896-1541

 

 

Cơ quản chủ quản:  N/A

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A reliable iterative method for solving the time-dependent singular Emden-Fowler equations
Tập 3 - Trang 99-105 - 2012
Abdul-Majid Wazwaz
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
The influence of triggers geometry upon the stiffness of cylindrical thin walled tubes
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Adrian Soica, Gheorghe N. Radu
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
Model of the arc earth-fault for medium voltage networks
Tập 1 - Trang 168-173 - 2011
Lubomir Marciniak
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
A power efficient bandwidth regulation technique for a low-noise high-gain RF wideband amplifier
Tập 2 - Trang 383-391 - 2012
Apratim Roy, S. M. S. Rashid
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
Vacuum-sintered body of a novel apatite for artificial bone
Tập 3 - Trang 700-706 - 2013
Kenichi Tamura, Tatsushi Fujita, Yuriko Morisaki
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
Catalogue of maximum crack opening stress for CC(T) specimen assuming large strain condition
Tập 3 - Trang 174-190 - 2013
Marcin Graba
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
Effects of baffle length on turbulent flows generated in stirred vessels
Tập 1 - Trang 401-412 - 2011
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
Integration of plug-in hybrid electric vehicles (PHEV) with grid connected residential photovoltaic energy systems
Tập 3 - Trang 233-242 - 2013
Adarsh Nagarajan, Wajiha Shireen
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
Numerical simulation of the 3D unsteady turbulent flow in a combustion chamber
- 2011
Adrian Stuparu, Sorin Holotescu
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