RÉSUMÉ. Le transport de contenus multimédia codés au standard MPEG-4 sur Internet est soumis à des contraintes de débit, de délai et de fiabilité. La charge et la nature du trafic sur le réseau ont des effets sur les pertes et les délais d’acheminement des paquets qui doivent être contrôlés. Dans cet article, nous proposons une technique de protection des objets audiovisuels (AVO) adaptée aux c...

Reflection energy from a linear reflector comes from an integrant over an aperture often described by the Fresnel zone. Within the Fresnel zone, the diffraction energy constructively builds the reflection energy. This paper uses diffraction theory to explain the reflector edge effect on amplitude and the amplitude variation within the Fresnel zone. Thus, discuss the Fresnel zone effect for AVO ...

Amplitude versus Angle (AVA) attributes include information about rock properties. Using a dataset from South America, we performed a multiple realization method to get multiple equal-probable AVA intercepts, gradients, and their products. We generated a 3D histogram to evaluate the variability of those AVA attributes. In the same area, we chose a 2-D section by matching it to three wells. Then...

The paper analyzes how the use of additional information obtained thought borehole gravimetric measurements affects accuracy determining parameters medium when evaluating elastic impedances in framework AVO-analysis. possibility increasing seismic survey results procedure for through gravimetry data has been demonstrated.

The effects of high pulmonary blood flow and pressure on pulmonary development are well understood, but the effect of low pulmonary flow/pressure is not. Pulmonary stenosis (PS) was therefore used as a model to determine its effect on lung development, which was assessed noninvasively by carbon monoxide transfer at rest and during exercise. One hundred and six control children (55 males, 8-16 y...

We have developed a pseudoelastic wave equation describing pure pressure waves propagating in elastic media. The pressure-mode (P-mode) uses all of the parameters (such as density and P- S-wave velocities). It produces same amplitude variation with offset (AVO) effects PP-reflections computed by conventional equation. Because new is free S-waves, it does not require finer grids for simulation. ...