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Pressure waves

Publication

Analytical analysis of slow and fast pressure waves in a two-dimensional cellular solid with fluid-filled cells

Wave propagation in cellular and porous media is widely studied due to its abundance in nature and industrial applications. Biot's theory for open-cell media predicts the existence of two simultaneous pressure waves, distinguished by its velocity. A fast w ...

Acoustical Soc Amer Amer Inst Physics2016

Publication

Incommensurate atomic density waves in the high-pressure IVb phase of barium

Gervais Chapuis, Alla Arakcheeva, Philip Pattison, Vladimir Dmitriev

The host–guest structures of elements at high pressure discovered a decade ago still leave many open questions due to the lack of precise models based on full exploitation of the diffraction data. This concerns in particular Ba IV, which is stable in the r ...

Int Union Crystallography2017

Publication

Noninvasive Cardiac Output and Central Systolic Pressure From Cuff-Pressure and Pulse Wave Velocity

Nikolaos Stergiopoulos, Bram Trachet, Vasiliki Bikia, Stamatia Zoi Pagoulatou

Goal: We introduce a novel approach to estimate cardiac output (CO) and central systolic blood pressure (cSBP) from noninvasive measurements of peripheral cuff-pressure and carotid-to-femoral pulse wave velocity (cf-PWV). Methods: The adjustment of a previ ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2020

Publication

Experimental Evidence of Hydroacoustic Pressure Waves in a Francis Turbine Elbow Draft Tube for Low Discharge Conditions

François Avellan, Christophe Nicolet

The complex three-dimensional unsteady flow developing in the draft tube of a Francis turbine is responsible for pressure fluctuations, which could prevent the whole hydropower plant from operating safely. Indeed, the Francis draft tube is subjected to inl ...

2009

Publication

On the assessment of arterial compliance from carotid pressure waveform

Nikolaos Stergiopoulos, Georgios Rovas, Vasiliki Bikia, Stamatia Zoi Pagoulatou, Patrick Segers

In a progressively aging population, it is of utmost importance to develop reliable, noninvasive, and cost-effective tools to estimate biomarkers that can be indicative of cardiovascular risk. Various pathophysiological conditions are associated to changes ...

AMER PHYSIOLOGICAL SOC2021

Publication

Constant-pressure sound waves in non-Hermitian disordered media

Romain Christophe Rémy Fleury, Hervé Lissek, Etienne Thierry Jean-Luc Rivet, Stefan Rotter

When waves impinge on a disordered material they are back-scattered and form a highly complex interference pattern. Suppressing any such distortions of a wave’s free propagation is a challenging task with many applications in a number of different discipli ...

2018

Lecture

Electromagnetic Waves: Energy, Momentum, and Radiation Pressure

Explores electromagnetic waves' energy, momentum, and radiation pressure, including forces generated by radiation pressure and the transmission of waves through Earth's atmosphere.

Lecture

Photon Picture of Electromagnetic Waves

Explores the photon concept in electromagnetic waves, including energy, momentum, emission by charges, coherence length, and the electromagnetic spectrum.

Lecture

Electromagnetic Waves: Maxwell Equations and Propagation

Explores Maxwell equations, electromagnetic wave propagation, energy conservation, and wave characteristics.

Lecture

Atoms and Radiation: Electromagnetic Wave Propagation

Explores electromagnetic wave propagation, including Poynting vector, irradiance, dipole radiation, dielectric constant, and natural linewidth in atoms and radiation.

Lecture

Electromagnetic Waves: Equations and Energy Transport

Explores electromagnetic wave equations, energy transport, spectrum, and momentum transfer.

Lecture

Radiation Principles: Understanding Atmospheric Interactions

Introduces the principles of atmospheric radiation and its impact on climate change.

Lecture

Photon: Emission of Waves

Covers the concept of a photon, its emission, coherence length, and the electromagnetic spectrum.

Lecture

Electromagnetic Waves: Wave Equation and Maxwell's Equations

Explores the wave equation for electromagnetic waves, Maxwell's predictions, and the importance of polarization in defining wave properties.

Lecture

Electromagnetic Waves: Theory & Applications

Explores electromagnetic waves, Maxwell's equations, circuits, and wave propagation through different media.

Lecture

Maxwell Equations for Antennas: Theory and Applications

Explores the application of Maxwell's equations to antennas, covering radiation, potentials, currents, waves, and polarization.

Lecture

Maxwell for Antennas: Slides 25-Fin

Explores the application of Maxwell's equations to antennas, covering radiation, Poynting vector, potentials, source currents, diffraction, and wave polarization.

Lecture

Introduction to Radiation

Introduces heat transfer mechanisms, electromagnetic radiation, thermal emission, and radiative heat transfer with various objects.

Lecture

Energy Transfer in Electromagnetic Waves

Explores energy transfer in electromagnetic waves, including momentum and radiation pressure, setting the stage for understanding light interactions with electrons.

Lecture

Wave Equation Solutions in 3D: Normal Modes and Sound Pressure Distributions

Explores wave equation solutions, normal modes, and sound pressure distributions in 3D rectangular rooms.