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563 results on '"Fleury, G."'

105. Tournée 1992 de l'Association Forêt Méditerranéenne au Parc national des Abruzzes Italie

Author

Fleury, G., Aillaud, G.J., Mercier, J.L., and Service irevues, irevues

Subjects
CANIS LUPUS (Loup), CHASSE, PARC NATIONAL, ABRUZZES (Italie), [SDV.SA.SF] Life Sciences [q-bio]/Agricultural sciences/Silviculture, forestry, ITALIE, FAUNE
Abstract

Dossier composé des trois articles suivants : -Sur les traces de l'Ours Marsicano, tournée 1992 de l'Association Forêt Méditerranéenne au Parc national des Abruzzes, Italie, -La végétation sylvatique du Parc national des Abruzzes, -La faune sauvage et la chasse dans le Parc national des Abruzzes.

Published
1993

141. Designing of Phased Array Transducers for Industrial Applications.

Author

Dumas, Ph, J. Poguet, Ph, and Fleury, G.

Subjects
TRANSDUCERS, NONDESTRUCTIVE testing, ELECTRONIC probes, GEOMETRY, TESTING, SPEED
Abstract

By increasing inspection speed, and deflection capabilities of the transducers, Phased-array technology has proved its interest to face new ∂ NDT challenges, and is becoming more and more popular in the main industrial fields of activities. This paper describes the main effects of specifications on transducer performances, and explains how to defined them. The second part speaks about the manufacturing step, showing the influence of component choice on performances. Several Phased-array applications examples illustrating these considerations will be presented. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2004
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144. Groove Sizing Using a Robust Neural Network Approach.

Author

Le Brusquet, L., Davoust, M.-E., and Fleury, G.

Subjects
EDDY currents (Electric), PIPE
Abstract

The remote field eddy current technique is used to inspect conductive pipes from the inside. The problem is to calculate an estimation of groove dimensions from observed data. A first approach was previously developed using a two-step parametric inversion. Results from this first approach are produced using a new model. A second approach using a neural network is presented. This technique is known for the lack of robustness which may occur when precautions are not sufficient. This paper presents these precautions and the results of both approaches. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2003

145. New Piezocomposite Transducers for Improvement of Ultrasonic Inspections.

Author

Dumas, Ph., Poguet, J., and Fleury, G.

Subjects
TRANSDUCERS, PIEZOELECTRIC devices, ULTRASONICS
Abstract

The increasing need for improved productivity and reliability of tests, adaptation to inspection of particular materials due to their shapes, their structures or quite simply of their location, constitutes the new stakes of the ultra sound non destructive testing. Thanks to its electroacoustical and mechanical characteristics, the piezocomposite technology makes possible the manufacturing of new kinds of transducers such as High performances single element, Aspherical or Phased-array transducers, which allows to face these new challenge. Moreover, the use of this material in a frequency range up to 20 MHz, open the door to new inspections possibilities. After a presentation of this technology and its advantages, this paper describes different examples in sensitive various sectors, such as nuclear or aeronautic, where the realisation of Phased-array, or single element piezocomposite transducers constituted a performant and reliable solution. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2003

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