Coordinate determination of the low‐flying object by the acoustical method

2003 ◽  
Vol 113 (4) ◽  
pp. 2313-2313
Author(s):  
Igor L. Oboznenko ◽  
Tran H. Dat
Keyword(s):  
Acoustical Method ◽  
Coordinate Determination

Determination of Physical Properties of Isotropic Porous Materials by Impedance Tube

2009 ◽  
Author(s):  
Sanjay Sharma ◽  
Dennis Siginer
Keyword(s):  
Porous Medium ◽  
Fluid Flow ◽  
Physical Properties ◽  
Porous Materials ◽  
Low Frequency ◽  
Permeability Measurement ◽  
Impedance Tube ◽  
Acoustical Properties ◽  
Acoustical Method

Simulation of fluid flow in porous materials depends upon the accuracy of permeability measurement. This study details the development of an acoustical method to determine permeability of porous medium. Standardized acoustical testing for low frequency using impedance tube is carried out to determine the acoustical properties of the fibers. Physical properties of porous medium are determined by reverse calculation from the acoustical properties. The acoustical method is validated by comparing the measured acoustical properties of the porous medium by the analytical method. A variety of foams and fibers are tested using this methodology.

scholarly journals Determination of the gas constant by an acoustical method

Nature ◽  
1974 ◽  
Vol 250 (5463) ◽  
pp. 218-218 ◽  
Author(s):  
T. J. QUINN ◽  
T. R. D. CHANDLER ◽  
A. R. COLCLOUGH
Keyword(s):  
Acoustical Method

A new determination of the gas constant by an acoustical method

1976 ◽  
Vol 283 (1314) ◽  
pp. 367-420 ◽  
Keyword(s):  
Pressure Range ◽  
Velocity Of Sound ◽  
Velocity Measurements ◽  
Acoustical Method

A new determination of the gas constant has been made using a method in which the velocity of sound in argon was measured by means of an acoustic inteferometer operated at a temperature close to 273.16 K. Ninety-eight independent velocity measurements were made over a pressure range from 30 to 200 kPa to enable the velocity at zero pressure to be deduced by extrapolation. By using this experimental value, a new value for the gas constant of 8315.73 + 0.17 J K _1kmol_1 was deduced. This is higher than the old value for R , obtained from measurements of the density oi oxygen, by 159 p.p.m. (parts/106).

On the Organization of Absolute Coordinate Determination of the FK5 Stars

1990 ◽  
pp. 84-84
Author(s):  
B. K. Bagildinsky ◽  
V. A. Fomin ◽  
I.S. Guseva ◽  
T. R. Kirian ◽  
A. A. Nemiro ◽  
...  
Keyword(s):  
Coordinate Determination
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