Concept

Sound pressure

Related publications (78)

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Coupling BEM and GFPE for complex outdoor sound propagation

François Aballéa

In complex outdoor sound propagation meteorological effects as well as various absorbing properties and shapes of the boundaries need to be accounted for. This paper presents a hybrid GFPE-BEM method relying on the power of the BEM near obstacles and uneve ...

2003

The Plenacoustic Function, Sampling and Reconstruction

Martin Vetterli, Thibaut Ajdler

In the present paper, we study the spatialization of the soundfield in a room, in particular the evolution of room impulse responses as function of their spatial positions. The presented technique allows us to completely characterize the sound field in any ...

2003

Contribution à l'étude des modes de rayonnement acoustique d'une structure

Olivier Schevin

Noise radiated by different industrial structures that surround us in daily life are more and more considered as environmental pollution. Standards defining a tolerable sound level for each of these noise sources are regularly called into question and resp ...

EPFL2001

Impurity Rydberg states as probes of local dynamics in the condensed phase

Majed Chergui, Franco Vigliotti

We report on structural dynamics in simple van der Waals solids (Ar, Ne, and H2), as driven by the excitation of an impurity (NO) Rydberg state. The resulting charge redistribution induces a local radial deformation of the medium ("bubble" formation). Th ...

2001

Photoinduced dynamics in solid hydrogens

Majed Chergui, Franco Vigliotti

The medium response of solid hydrogens to an impulsive perturbation has been studied using Rydberg excitation of an NO impurity. This leads to formation of an "electronic" bubble which corresponds to a cage radius increment of about 25%. The process has ...

2000

IF: an intermediate representation for SDL and its applications

Joseph Sifakis

We present work of a project for the improvement of a specification/validation toolbox integrating a commercial toolset ObjectGEODE and different validation tools such as the verification tool CADP and the test sequence generator TGV. The intrinsic complex ...

1999

Brillouin-scattering observation of the TA-TO coupling in SrTiO3

Alexander Tagantsev

Brillouin scattering from transverse-acoustic modes of SrTiO3 is observed, while the frequencies of the soft polar modes are remeasured with hyper-Raman scattering. It is shown that an anomalous decrease of sound velocities at low temperatures results from ...

1998

Stabilization of External-Modes in Tokamaks by Resistive Walls and Plasma Rotation

It is shown that low n, pressure-driven, external modes in tokamaks can be fully stabilized by resistive walls when the plasma rotates at some fraction of the sound speed. The stabilization depends on toroidal coupling to sound waves and is affected by ion ...

1994