Simulation of ultrasonic pulse propagation, distortion, and attenuation in the human chest wall

1999 ◽  
Vol 106 (6) ◽  
pp. 3665-3677 ◽  
Author(s):  
T. Douglas Mast ◽  
Laura M. Hinkelman ◽  
Leon A. Metlay ◽  
Michael J. Orr ◽  
Robert C. Waag
Keyword(s):  
Chest Wall ◽  
Pulse Propagation ◽  
Ultrasonic Pulse

Ultrasonic pulse propagation in inhomogeneous one-dimensional media

1998 ◽  
Vol 104 (1) ◽  
pp. 57-63 ◽  
Author(s):  
N. Cretu ◽  
P. P. Delsanto ◽  
G. Nita ◽  
C. Rosca ◽  
M. Scalerandi ◽  
...  
Keyword(s):  
Pulse Propagation ◽  
Ultrasonic Pulse ◽  
One Dimensional

Influence of Clutch Disc Waste (Grinding Dust) on Portland Cement Hydration

2019 ◽  
Vol 803 ◽  
pp. 284-288
Author(s):  
José da Silva Andrade Neto ◽  
Tiago Assunção Santos ◽  
Raphael Dias Mariano ◽  
Marcio Raymundo Morelli ◽  
Daniel Véras Ribeiro
Keyword(s):  
Portland Cement ◽  
Propagation Velocity ◽  
Pulse Propagation ◽  
Cement Hydration ◽  
Setting Time ◽  
Reference Sample ◽  
Ultrasonic Pulse ◽  
X Ray Diffraction ◽  
Copper Zinc ◽  
Portland Cement Hydration

This paper evaluates the effect of grinding dust (GD), a waste generated in the clutch disc finishing process, on Portland cement hydration. For this, pastes with additions of 5%, 10% and 15% GD, relative to cement weight, were molded and compared with a reference sample. Tests of setting time determination by Vicat needle, calorimetry, monitoring the ultrasonic pulse propagation velocity and mineralogical analysis (X-ray diffraction) in pastes with 1 day of hydration were carried out. It was observed that GD, due to the presence of copper, zinc and phenolic resin in its composition, is responsible for retarding cement hydration and thus increases the setting time and delays the evolution of heat release and pulse propagation velocity. However, the formation of new crystalline phases was not observed.

Measurements of ultrasonic pulse distortion produced by human chest wall

1997 ◽  
Vol 101 (4) ◽  
pp. 2365-2373 ◽  
Author(s):  
Laura M. Hinkelman ◽  
Thomas L. Szabo ◽  
Robert C. Waag
Keyword(s):  
Chest Wall ◽  
Ultrasonic Pulse ◽  
Pulse Distortion

Simulation of ultrasonic pulse propagation through the abdominal wall

1997 ◽  
Vol 102 (2) ◽  
pp. 1177-1190 ◽  
Author(s):  
T. Douglas Mast ◽  
Laura M. Hinkelman ◽  
Michael J. Orr ◽  
Victor W. Sparrow ◽  
Robert C. Waag
Keyword(s):  
Abdominal Wall ◽  
Pulse Propagation ◽  
Ultrasonic Pulse

Anisotropic parameters of dry and saturated sand under stress

Geophysics ◽  
2016 ◽  
Vol 81 (5) ◽  
pp. C229-C241 ◽  
Author(s):  
Mohammad H. Bhuiyan ◽  
Rune M. Holt
Keyword(s):  
Pulse Propagation ◽  
Anisotropy Parameter ◽  
Ultrasonic Pulse ◽  
Uniaxial Strain ◽  
P Wave ◽  
Anisotropic Fluid ◽  
Fluid Substitution ◽  
S Wave ◽  
Fluid Saturation ◽  
Theoretical Predictions

Fluid substitution has wide applicability in seismic, such as in 4D and amplitude variation with offset analysis. Traditionally, the isotropic Gassmann equation has been used for this purpose; however, in many cases, anisotropic fluid substitution may be more relevant. Recent theoretical developments by Collet and Gurevich and by Thomsen based on the anisotropic Gassmann equation have pointed in particular to the fluid sensitivity of Thomsen’s anisotropy parameters. We have verified these theoretical predictions on a simple granular medium in controlled experiments in which anisotropy was induced largely by the applied stress. For this purpose, unconsolidated dry and saturated sands were loaded in uniaxial strain as well as hydrostatically, in dry and in brine-saturated conditions. Stresses were between 1 and 15 MPa. Multidirectional P- and S-wave velocities were measured by ultrasonic pulse propagation. Our experiments indicated that the P-wave anisotropy parameter [Formula: see text] and the moveout parameter [Formula: see text] decrease in magnitude upon fluid saturation. Saturated samples reveal close to elliptical anisotropy, and for the dry and the saturated case, the ellipticity remains constant during uniaxial strain experiments. These experimental observations fit the theoretical predictions within the uncertainty of the experiments. Surprisingly, the S-wave anisotropy parameter [Formula: see text] is also found to be sensitive to fluid saturation and increases upon fluid saturation. It is also seen that fluid substitution applying the isotropic Gassmann equation underestimates the saturated P-wave modulus in most cases, and that use of the anisotropic Gassmann equation does not lead to significant improvements. These observations may be explained, at least qualitatively, by correcting for anisotropic dispersion caused by Biot’s global flow mechanism.

scholarly journals Unstable behaviour of rocks

2009 ◽  
Vol 31 (3-4) ◽  
Author(s):  
Luong Minh Phong
Keyword(s):  
Pulse Propagation ◽  
Dimensionless Parameter ◽  
Compressive Loading ◽  
Ultrasonic Pulse ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Reduction Procedure ◽  
Specific Data ◽  
Damage Process ◽  
Non Destructive

This paper aims to introduce a new non-destructive testing technique in use for detecting the occurrence of material instability and a specific data reduction procedure to access damage accumulation. An input-output non-parametric procedure based on ultrasonic pulse propagation, and a non-linear analyser were chosen to portray the unstable behaviour of brittle rock material under static compressive loading. It can be used to monitor non-destructively and continuously the overall alteration or damage process so that damage mechanisms could be quantitatively estimated by a dimensionless parameter the so-called non-linearity ratio.

Novel Analysis of Ultrasonic Pulse Propagation Tests for Characterization of Asphalt Concrete

2021 ◽  
Vol 50 (2) ◽  
pp. 20210239
Author(s):  
Pejoohan Tavassoti ◽  
Taher H. Ameen ◽  
Hassan Baaj ◽  
Giovanni Cascante
Keyword(s):  
Asphalt Concrete ◽  
Pulse Propagation ◽  
Ultrasonic Pulse

scholarly journals Measurements of ultrasonic pulse distortion produced by the chest wall

1995 ◽  
Vol 98 (5) ◽  
pp. 2922-2922
Author(s):  
Laura M. Hinkelman ◽  
Robert C. Waag ◽  
Thomas L. Szabo
Keyword(s):  
Chest Wall ◽  
Ultrasonic Pulse ◽  
Pulse Distortion
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