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| HAL : hal-00161806, version 1 |
| Fiche détaillée |  Récupérer au format |
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| Chord-distribution functions and Rice formulae. Application to random media. |
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| Anne Estrade 1Ileana Iribarren 2 |
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| ANR mipomodim ANR-05-BLAN-017 Collaboration(s) |
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| (11/07/2007) |
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| We consider an isotropic bi-phasic (pore and solid) medium, draw many lines through it, and see each line as a one-dimensional level-cut process with values 0 or 1 according to whether a regular stationary process $X$ is less or greater than a given level. The lengths of time intervals when $X$ is in a given phase are named chord functions. We are interested into obtaining information on chord functions in order to get most characterizations of the medium such as the volume fractions, the two-point correlation function or the specific surface area. Working with the Palm probability measure and using level crossings techniques, Rice methods in particular, allow to obtain the exact analytical formula of the chord-distribution function as well as the joint distribution function of two successive chords and the two-point correlation function. Also the ``Independent Interval Assumption'' is discussed. |
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| 1 : | Mathématiques appliquées Paris 5 (MAP5) |
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CNRS : UMR8145 – Université Paris V - Paris Descartes |
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| 2 : | Escuela de Matematica, Facultad de Ciencias |
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Universidad Central de Venezuela |
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| 3 : | Statistique Appliquée et MOdélisation Stochastique (SAMOS) |
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Université Paris I - Panthéon Sorbonne |
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| 4 : | Centre d'économie de la Sorbonne (CES) |
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CNRS : UMR8174 – Université Paris I - Panthéon Sorbonne |
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| MAP5 - UMR CNRS 8145 |
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| Domaine | : | Mathématiques/Probabilités |
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| chord – (up/down) crossing – Gaussian process – level-cut process – Palm probability – porous medium – Rice formula |
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| hal-00161806, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00161806 | |
| oai:hal.archives-ouvertes.fr:hal-00161806 | |
| Contributeur : Anne Estrade | |
| Soumis le : Mercredi 11 Juillet 2007, 17:44:30 | |
| Dernière modification le : Mercredi 6 Février 2008, 16:51:55 | |
