Search results for "Cylindrical coordinates"

showing 3 items of 3 documents

Design criteria of tubular linear induction motors and generators: A prototype realization and its characterization

2013

In this paper a mathematical model of tubular linear induction machines (TLIM) with hollowed induced part is recalled. Moreover the design criteria of a TLIM with hollowed iron induced part are presented as well as the technological processes to be adopted and the choice of materials to construct the various parts. The methodologies for mechanical assembling and electric wiring are considered too. A prototype with bimetallic induced part has been designed and built. Finally some experimental results on electrical and mechanical variables, when the machines are used as motors, are shown.

Linear machinesMathematical modelTubular induction motorsTubular induction generatorsCylindrical coordinateLaminationTubular induction generatorLamination.lcsh:Electronic computers. Computer scienceCylindrical coordinatesSettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettricilcsh:QA75.5-76.95Linear machine
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Potential and energy of some spheroidal charge distributions with azimuthal symmetry

1989

Abstract The Poisson equation is solved for three types of spheroidal charge distributions with azimuthal symmetry, namely, those depending on one cartesian coordinate, on the radial cylindrical coordinate and on the radial spherical coordinate. The energy of such distributions is found for the case of power functions of these coordinates and it has been normalized, computed and plotted for some low values of the exponent.

PhysicsCurvilinear coordinatesBipolar cylindrical coordinatesMathematical analysisSpherical coordinate systemProlate spheroidal coordinatesCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsClassical mechanicsCylindrical coordinate systemElectrical and Electronic EngineeringElliptic cylindrical coordinatesPoisson's equationBiotechnologyElliptic coordinate systemJournal of Electrostatics
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Analysis of a Parabolic Cross-Diffusion Semiconductor Model with Electron-Hole Scattering

2007

The global-in-time existence of non-negative solutions to a parabolic strongly coupled system with mixed Dirichlet–Neumann boundary conditions is shown. The system describes the time evolution of the electron and hole densities in a semiconductor when electron-hole scattering is taken into account. The parabolic equations are coupled to the Poisson equation for the electrostatic potential. Written in the quasi-Fermi potential variables, the diffusion matrix of the parabolic system contains strong cross-diffusion terms and is only positive semi-definite such that the problem is formally of degenerate type. The existence proof is based on the study of a fully discretized version of the system…

Parabolic cylindrical coordinatesApplied MathematicsDegenerate energy levelsMathematical analysisBoundary value problemParabolic cylinder functionPoisson's equationGalerkin methodParabolic partial differential equationBackward Euler methodAnalysisMathematicsCommunications in Partial Differential Equations
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