Brillouin-scattering determination of the acoustic properties and their pressure dependence for three polymeric elastomers

2007 ◽  
Vol 127 (10) ◽  
pp. 104906 ◽  
Author(s):  
Lewis L. Stevens ◽  
E. Bruce Orler ◽  
Dana M. Dattelbaum ◽  
Muhtar Ahart ◽  
Russell J. Hemley
Keyword(s):  
Pressure Dependence ◽  
Brillouin Scattering ◽  
Acoustic Properties

BRILLOUIN-SCATTERING DETERMINATION OF THE ACOUSTIC PROPERTIES OF POLYMERS AT HIGH PRESSURE

2008 ◽  
Author(s):  
D. M. Dattelbaum ◽  
L. L. Stevens ◽  
E. B. Orler ◽  
M. Ahart ◽  
R. J. Hemley ◽  
...  
Keyword(s):  
High Pressure ◽  
Brillouin Scattering ◽  
Acoustic Properties

Brillouin-scattering determination of the elastic constants of epitaxial fccC60film

1995 ◽  
Vol 52 (12) ◽  
pp. R8707-R8710 ◽  
Author(s):  
D. Fioretto ◽  
G. Carlotti ◽  
G. Socino ◽  
S. Modesti ◽  
C. Cepek ◽  
...  
Keyword(s):  
Elastic Constants ◽  
Brillouin Scattering

A Numerical Investigation of Aeroacoustic Fan Blade Flutter

2003 ◽  
Author(s):  
X. Wu ◽  
M. Vahdati ◽  
A. I. Sayma ◽  
M. Imregun
Keyword(s):  
Research Effort ◽  
Pressure Rise ◽  
Acoustic Properties ◽  
Pressure Amplitude ◽  
Ongoing Research ◽  
Blade Flutter ◽  
Fan Blade ◽  
Underlying Mechanisms ◽  
Flutter Margin

This paper reports the results of an ongoing research effort to explain the underlying mechanisms for aeroacoustic fan blade flutter. Using a 3D integrated aeroelasticity method and a single passage blade model that included a representation of the intake duct, the pressure rise vs. mass flow characteristic of a fan assembly was obtained for the 60%–80% speed range. A novel feature was the use of a downstream variable-area nozzle, an approach that allowed the determination of the stall boundary with good accuracy. The flutter stability was predicted for the 2 nodal diameter assembly mode arising from the first blade flap mode. The flutter margin at 64% speed was predicted to drop sharply and the instability was found to be independent of stall effects. On the other hand, the flutter instability at 74% speed was found to be driven by flow separation. Further post-processing of the results at 64% speed indicated significant unsteady pressure amplitude build-up inside the intake at the flutter condition, thus highlighting the link between the acoustic properties of the intake duct and fan blade flutter.

Determination of the pressure dependence of transference numbers

1970 ◽  
Vol 74 (13) ◽  
pp. 2724-2726 ◽  
Author(s):  
Robert L. Kay ◽  
Krishnahadi S. Pribadi ◽  
Barry Watson
Keyword(s):  
Pressure Dependence ◽  
Transference Numbers

scholarly journals Experimental evidence for silica-enriched Earth’s lower mantle with ferrous iron dominant bridgmanite

2020 ◽  
Vol 117 (45) ◽  
pp. 27899-27905
Author(s):  
Izumi Mashino ◽  
Motohiko Murakami ◽  
Nobuyoshi Miyajima ◽  
Sylvain Petitgirard
Keyword(s):  
Sound Velocity ◽  
Lower Mantle ◽  
Mantle Convection ◽  
Brillouin Scattering ◽  
Seismic Structure ◽  
The Earth ◽  
Diamond Anvil ◽  
Evolution Dynamics ◽  
Iron Bearing

Determination of the chemical composition of the Earth’s mantle is of prime importance to understand the evolution, dynamics, and origin of the Earth. However, there is a lack of experimental data on sound velocity of iron-bearing Bridgmanite (Brd) under relevant high-pressure conditions of the whole mantle, which prevents constraints on the mineralogical model of the lower mantle. To uncover these issues, we have conducted sound-velocity measurement of iron-bearing Brd in a diamond-anvil cell (DAC) up to 124 GPa using Brillouin scattering spectroscopy. Here we show that the sound velocities of iron-bearing Brd throughout the whole pressure range of lower mantle exhibit an apparent linear reduction with the iron content. Our data fit remarkably with the seismic structure throughout the lower mantle with Fe2+-enriched Brd, indicating that the greater part of the lower mantle could be occupied by Fe2+-enriched Brd. Our lower-mantle model shows a distinctive Si-enriched composition with Mg/Si of 1.14 relative to the upper mantle (Mg/Si = 1.25), which implies that the mantle convection has been inefficient enough to chemically homogenize the Earth’s whole mantle.

Determination of the pressure dependence of polymer melt viscosity using a combination of oscillatory and capillary rheometer

2019 ◽  
Vol 60 (3) ◽  
pp. 517-523 ◽  
Author(s):  
Sumanta Raha ◽  
Harindranath Sharma ◽  
M. Senthilmurugan ◽  
Sumanda Bandyopadhyay ◽  
Prasanta Mukhopadhyay
Keyword(s):  
Pressure Dependence ◽  
Polymer Melt ◽  
Capillary Rheometer ◽  
Melt Viscosity

Experimental determination of the electro-acoustic properties of thin film AlScN using surface acoustic wave resonators

2019 ◽  
Vol 126 (7) ◽  
pp. 075106 ◽  
Author(s):  
Nicolas Kurz ◽  
Anli Ding ◽  
Daniel F. Urban ◽  
Yuan Lu ◽  
Lutz Kirste ◽  
...  
Keyword(s):  
Thin Film ◽  
Acoustic Wave ◽  
Experimental Determination ◽  
Surface Acoustic Wave ◽  
Acoustic Properties ◽  
Acoustic Wave Resonators
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