Measurement of interfacial areas in aerobic fermentations by ultrasonic pulse transmission

1986 ◽  
Vol 28 (9) ◽  
pp. 1302-1309 ◽  
Author(s):  
Andrej A. Stravs ◽  
Alain Pittet ◽  
Urs von Stockar ◽  
Peter J. Reilly
Keyword(s):  
Ultrasonic Pulse ◽  
Pulse Transmission ◽  
Interfacial Areas ◽  
Ultrasonic Pulse Transmission

scholarly journals Composition Dependence of Elastic Moduli of Mixed Cobalt-Zinc Ferrites Prepared by Citrate Precursor Method

2019 ◽  
Vol 32 (1) ◽  
pp. 31-35
Author(s):  
Ch. Vinuthna ◽  
Sandupatla Raju ◽  
D. Ravinder
Keyword(s):  
Synthesis Method ◽  
Ultrasonic Pulse ◽  
Elastic Module ◽  
Pulse Transmission ◽  
Precursor Synthesis ◽  
Rigidity Modulus ◽  
Binding Forces ◽  
Ultrasonic Pulse Transmission ◽  
Elastic Modules ◽  
Citrate Precursor

CoxZn1-xFe2O4 nanoparticles were prepared by chemical citrate precursor synthesis method. The Young’s modulus ‘E’ and the rigidity modulus ‘n’ of mixed cobalt-zinc ferrites have been determined by the ultrasonic pulse transmission technique at 1 MHz. The elastic modules of the ferrites were corrected to zero porosity using the formulae of Harselman and Fulrath. The observed variation of the elastic module with composition has been interpreted on the basis of binding forces between the atoms of the spinal lattice. A linear relationship between Debye temperature ØD and average sound velocity Vm has also been observed.

Wave velocities in hydrocarbon‐saturated rocks: Experimental results

Geophysics ◽  
1990 ◽  
Vol 55 (6) ◽  
pp. 723-733 ◽  
Author(s):  
Z. Wang ◽  
A. Nur
Keyword(s):  
Oil Recovery ◽  
High Frequency ◽  
Ultrasonic Pulse ◽  
Heavy Oils ◽  
Saturated Sand ◽  
Temperature Changes ◽  
Wave Velocities ◽  
Recovery Processes ◽  
Pulse Transmission ◽  
Ultrasonic Pulse Transmission

This paper contains laboratory measurements of the temperature dependence of velocities, determined by ultrasonic pulse transmission methods, in hydrocarbon liquids and rock samples saturated by the liquids. The samples discussed include 26 hydrocarbons of varying molecular weight, nine mixtures of these hydrocarbons, four heavy oils (tar), three saturated sandstones, and a saturated sand. The data provide encouragement that high‐frequency, high‐resolution seismic techniques may infer formation temperature changes, thereby detecting the progress of thermal enhanced oil recovery processes.

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