Determination of the thermodynamics of He II from sound-velocity data

1976 ◽  
Vol 14 (9) ◽  
pp. 3868-3891 ◽  
Author(s):  
J. Maynard
Keyword(s):  
Sound Velocity ◽  
Velocity Data

Determination of the Infinite Frequency Sound Velocity in the Glass Formero-Terphenyl

1998 ◽  
Vol 80 (10) ◽  
pp. 2161-2164 ◽  
Author(s):  
G. Monaco ◽  
C. Masciovecchio ◽  
G. Ruocco ◽  
F. Sette
Keyword(s):  
Sound Velocity ◽  
Frequency Sound

The through transmission impact method for measuring the sound velocity in the compact concrete cubic samples

Metrologiya ◽  
2021 ◽  
pp. 31-40
Author(s):  
V. K. Kachanov ◽  
I. V. Sokolov ◽  
A. A. Samokrutov ◽  
V. G. Shevaldykin ◽  
S. A. Fedorenko ◽  
...  
Keyword(s):  
Surface Wave ◽  
Resonant Frequency ◽  
Sound Velocity ◽  
Measurement Accuracy ◽  
Concrete Durability

A through transmission impact method for measuring the sound velocity in the concrete cubic samples, which are used for determination of the concrete durability, is proposed. It is shown that for elimination of the surface wave influence on the measurement accuracy of the compact cubic sample resonant frequency the impactor and the receiving transducer should be placed on the opposite sides of the cube. Besides in some cases must be used multichannel through transmission impact method.

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.

scholarly journals The field luminosity function and nearby groups of galaxies

1978 ◽  
Vol 79 ◽  
pp. 271-273
Author(s):  
John Huchra
Keyword(s):  
Surface Brightness ◽  
Luminosity Function ◽  
High Surface ◽  
Homogeneous System ◽  
Velocity Data ◽  
Limited Sample ◽  
Groups Of Galaxies ◽  
Dynamical Properties ◽  
Radial Velocity Data

We have assembled a catalog of radial velocities and magnitudes on a homogeneous system (the corrected Harvard, B(o) magnitudes of de Vaucouleurs) for over 4000 galaxies. Using this catalog, we have compiled a magnitude limited sample of ~ 1000 galaxies with nearly complete radial velocity data. the magnitude limit is 13.0 and the galaxies are primarily from the Shapley-Ames catalog plus a few low and high surface brightness objects properly included in a magnitude limited sample. My colleagues, M. Davis, M. Geller and I are presently analyzing the dynamical properties of this sample. I would like to briefly describe a new determination of the field luminosity function and density plus our initial experiments with the use of a redshift catalog to select groups of galaxies.

Sign in / Sign up

Export Citation Format

Share Document