The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform

Francis Ménil - One of the best experts on this subject based on the ideXlab platform.

  • Screen-printed varistors : New strategy for high non-Linear Coefficient
    Journal of The European Ceramic Society, 2007
    Co-Authors: Claude Lucat, Marie-pascale Martin, Alain Largeteau, Hélène Debeda-hickel, Francis Ménil
    Abstract:

    Abstract Screen-printed thick film varistors (TFV) based on ZnO powder were developed with the aim to protect IGBT power transistors against overvoltages. The electrical characteristic of TFV was shown to depend on the electrode composition. Furthermore, characterization of the microassembly [electrodes/ZnO/Al 2 O 3 substrate] proved that in the case of ZnO layers fired at 1200 °C, the low non-Linearity Coefficients ( α 2 O 3 . The obtained values of α larger than 40 are the highest ones so far recorded for ZnO TFV and compare well to those of ceramics.

  • Screen-printed varistors: New strategy for high non-Linear Coefficient
    Journal of the European Ceramic Society, 2007
    Co-Authors: Claude Lucat, Marie-pascale Martin, Hélène Debéda, Alain Largeteau, Francis Ménil
    Abstract:

    Screen-printed thick film varistors (TFV) based on ZnO powder were developed with the aim to protect IGBT power transistors against overvoltages. The electrical characteristic of TFV was shown to depend on the electrode composition. Furthermore, characterization of the microassembly [electrodes/ZnO/Al2O3 substrate] proved that in the case of ZnO layers fired at 1200 °C, ...

Gennaro Chiarello - One of the best experts on this subject based on the ideXlab platform.

  • Purely quadratic dispersion of surface plasmon in Ag/Ni(111): the influence of electron confinement
    physica status solidi (RRL) – Rapid Research Letters, 2008
    Co-Authors: Antonio Politano, Raffaele G. Agostino, E. Colavita, Vincenzo Formoso, Gennaro Chiarello
    Abstract:

    Surface plasmon dispersion in nanoscale thin Ag films deposited onto the Ni(111) surface was investigated by angle-resolved electron energy loss spectroscopy. We found that the dispersion curve contains only the quadratic term. The vanishing of the Linear term was ascribed to the presence in the film of Ag 5sp-related quantum well states. Screening effects enhanced by electron confinement in Ag quantum well states push the position of the centroid of the induced charge of the surface plasmon less inside the interface compared to other Ag systems, rendering null the Linear Coefficient of the dispersion curve. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Andrew Hunter - One of the best experts on this subject based on the ideXlab platform.

  • expression inference genetic symbolic classification integrated with non Linear Coefficient optimisation
    Artificial Intelligence and Symbolic Computation, 2002
    Co-Authors: Andrew Hunter
    Abstract:

    Expression Inference is a parsimonious, comprehensible alternative to semi-parametric andnon-parametric classification techniques such as neural networks, which generates compact symbolic mathematical expressions for classification or regression. This paper introduces a general framework for inferring symbolic classifiers, using the Genetic Programming paradigm with non-Linear optimisation of embedded Coefficients. An error propagation algorithm is introduced to support the optimisation. A multiobjective variant of Genetic Programming provides a range of models trading off parsimony and classification performance, the latter measuredb y ROC curve analysis. The technique is shown to develop extremely concise and effective models on a sample real-world problem domain.

  • AISC - Expression Inference - Genetic Symbolic Classification Integrated with Non-Linear Coefficient Optimisation
    Lecture Notes in Computer Science, 2002
    Co-Authors: Andrew Hunter
    Abstract:

    Expression Inference is a parsimonious, comprehensible alternative to semi-parametric andnon-parametric classification techniques such as neural networks, which generates compact symbolic mathematical expressions for classification or regression. This paper introduces a general framework for inferring symbolic classifiers, using the Genetic Programming paradigm with non-Linear optimisation of embedded Coefficients. An error propagation algorithm is introduced to support the optimisation. A multiobjective variant of Genetic Programming provides a range of models trading off parsimony and classification performance, the latter measuredb y ROC curve analysis. The technique is shown to develop extremely concise and effective models on a sample real-world problem domain.

Matjaz Vidmar - One of the best experts on this subject based on the ideXlab platform.

  • fibre non Linear Coefficient measurement based on four wave mixing method with two tone optical source
    Lasers and Electro-Optics Society Meeting, 2005
    Co-Authors: Bostjan Batagelj, Matjaz Vidmar, Saso Tomazic
    Abstract:

    In this paper, we present the novel two-tone non-Linear Coefficient meter achieves high peak power using pulsed operation. Both the two-tone generation and the pulse modulation are obtained from a single LiNbO/sub 3/ modulator, driven by standard microwave pulse generator. The obtained two optical signals have inherently the same Linear polarisation. The frequency spacing is precisely set by the modulation signal and no adjustment is required during the measurement because there is no wavelength difference drifting. The systematic errors produced by either stimulated Brillouin scattering or the spectral component coincidence are eliminated. The measurement scheme without expensive optical equipment is simple and well applicable to field measurement. It has long-term stability and good measurement repeatability. The introduced measurement scheme is applicable to all currently available fibre types including photonic crystal fibres.

  • four wave mixing determination of the non Linear Coefficient of optical fibers by improved measurement scheme
    Mediterranean Electrotechnical Conference, 2002
    Co-Authors: Bostjan Batagelj, Matjaz Vidmar
    Abstract:

    We improved measurement scheme for determining the optical fiber non-Linear Coefficient using four-wave mixing technique. The improved measurement source which uses one externally modulated continuous wave laser and one erbium-doped fiber amplifier only is described precisely. The proposed simple measurement scheme is polarization independent, enables high sensitivity, that leads to higher accuracy, and is applicable to all currently available types of fiber.

  • Fiber nonLinear Coefficient measurement scheme based on four-wave mixing method with externally modulated laser source
    Proceedings of 2002 4th International Conference on Transparent Optical Networks (IEEE Cat. No.02EX551), 2002
    Co-Authors: B. Batagelj, Matjaz Vidmar
    Abstract:

    In this paper, we present measurement scheme for determining the optical fiber non-Linear Coefficient /spl gamma/, using externally modulated continuous wave laser source. The measurement technique is based on four-wave mixing. The measurement source which uses one laser and one optical erbium-doped fiber amplifier only is described precisely. The proposed simple measurement scheme is polarization independent, enables high sensitivity and accuracy, and is applicable to all currently available types of fiber.

Bostjan Batagelj - One of the best experts on this subject based on the ideXlab platform.

  • fibre non Linear Coefficient measurement based on four wave mixing method with two tone optical source
    Lasers and Electro-Optics Society Meeting, 2005
    Co-Authors: Bostjan Batagelj, Matjaz Vidmar, Saso Tomazic
    Abstract:

    In this paper, we present the novel two-tone non-Linear Coefficient meter achieves high peak power using pulsed operation. Both the two-tone generation and the pulse modulation are obtained from a single LiNbO/sub 3/ modulator, driven by standard microwave pulse generator. The obtained two optical signals have inherently the same Linear polarisation. The frequency spacing is precisely set by the modulation signal and no adjustment is required during the measurement because there is no wavelength difference drifting. The systematic errors produced by either stimulated Brillouin scattering or the spectral component coincidence are eliminated. The measurement scheme without expensive optical equipment is simple and well applicable to field measurement. It has long-term stability and good measurement repeatability. The introduced measurement scheme is applicable to all currently available fibre types including photonic crystal fibres.

  • four wave mixing determination of the non Linear Coefficient of optical fibers by improved measurement scheme
    Mediterranean Electrotechnical Conference, 2002
    Co-Authors: Bostjan Batagelj, Matjaz Vidmar
    Abstract:

    We improved measurement scheme for determining the optical fiber non-Linear Coefficient using four-wave mixing technique. The improved measurement source which uses one externally modulated continuous wave laser and one erbium-doped fiber amplifier only is described precisely. The proposed simple measurement scheme is polarization independent, enables high sensitivity, that leads to higher accuracy, and is applicable to all currently available types of fiber.

  • a simple non Linear Coefficient measurement scheme based on four wave mixing
    2001
    Co-Authors: Bostjan Batagelj
    Abstract:

    Abstract We propose a novel measurement scheme of n 2 /A eff using FWM technique for an optical fibre. A simple measurement scheme uses only one laser source, avoids polarization dependence and is highly sensitive and accurate. Introduction As new fibres are being designed for non-Linear optics applications, a consistent approach to measurement of optical non-Linearity is required for systematic materials engineering and optimisation. Simultaneously, as overall transmitted data estimates on WDM and soliton systems increase, the effects of fibre non-Linearity come to play an even more decisive role in the design and performance of optical communications links. Additionally, more complicated span designs incorporating dispersion management may consist of several lengths of different fibre types, each having different non-Linear Coefficients. For this reason it is important to be able to simply and accurately measure the non-Linear Coefficient of fibres of different compositions. The non-Linear Coefficient is defined as the ratio between the non-Linear refractive index n