Search results for "Non linearite"

showing 4 items of 4 documents

Well-posed nonlinear problems in integrated circuits modeling

1991

In this paper we study the problem (E) + (BC) + (IC) (see below) which represents a model for integrated circuits. We assume that the distributed parametersr(x) andc(x) are nonconstant, dielectric leakages depend on thex-coordinate as well as the voltage level, while the interconnecting multiport is nonlinear and possibly multivalued.

Digital electronicsWell-posed problembusiness.industryNon lineariteApplied MathematicsElectrical engineeringNon linear modelDielectricIntegrated circuitlaw.inventionNonlinear systemlawSignal ProcessingElectronic engineeringbusinessMathematicsVoltageCircuits Systems and Signal Processing
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Radial solutions of Dirichlet problems with concave-convex nonlinearities

2011

Abstract We prove the existence of a double infinite sequence of radial solutions for a Dirichlet concave–convex problem associated with an elliptic equation in a ball of R n . We are interested in relaxing the classical positivity condition on the weights, by allowing the weights to vanish. The idea is to develop a topological method and to use the concept of rotation number. The solutions are characterized by their nodal properties.

Dirichlet problemNon lineariteApplied MathematicsMathematical analysisRegular polygonRadial solutions Multiplicity results Dirichlet concave–convex problem Rotation numberDirichlet distributionElliptic curveNonlinear systemsymbols.namesakesymbolsBall (mathematics)AnalysisRotation numberMathematics
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On the modeling of nonlinear interactions in large complex systems

2010

Abstract This work deals with the modeling of large systems of interacting entities in the framework of the mathematical kinetic theory for active particles. The contents are specifically focused on the modeling of nonlinear interactions which is one of the most important issues in the mathematical approach to modeling and simulating complex systems, and which includes a learning–hiding dynamics. Applications are focused on the modeling of complex biological systems and on immune competition.

Non lineariteLiving systems Nonlinearity Functional subsystems Kinetic theory Active particlesApplied MathematicsActive particlesComplex system010103 numerical & computational mathematics01 natural sciencesActive particlesLiving systems010101 applied mathematicsNonlinear systemLiving systemsFunctional subsystems0101 mathematicsKinetic theoryBiological systemComplex systems biologyNonlinearitySettore MAT/07 - Fisica MatematicaAlgorithmMathematicsApplied Mathematics Letters
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Estimation of sea surface temperature from SEVIRI data: algorithm testing and comparison with AVHRR products

2006

Three surface temperature (ST) algorithms for Spinning Enhanced Visible and InfraRed Imager (SEVIRI) data are developed and tested. A general split window algorithm for ST estimation, a sea surface temperature (SST) algorithm and a nonlinear algorithm (NLSST) developed for SEVIRI data. The test was carried out by comparing SEVIRI data with two types of data: (a) in situ and (b) obtained with the NLSST algorithm applied to Advanced Very High Resolution Radiometer (AVHRR). The field campaign was carried out over sea using a thermal radiometer. The algorithms were applied to SEVIRI images in coincidence with the field campaign and the results show an rms error lower than 0.7 K. The comparison …

RadiometerMeteorologyAdvanced very-high-resolution radiometerNon lineariteNonlinear algorithmsWRSADLIB-ART-2523Sea surface temperatureGeneral Earth and Planetary SciencesEnvironmental scienceSplit windowRoot-mean-square deviationAlgorithmField campaignRemote sensingInternational Journal of Remote Sensing
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