Observation of Akhiezer and Landau-Rumer Regimes in the Frequency Dependence of Shear-Wave Lattice Attenuation in CdS

1975 ◽  
Vol 35 (12) ◽  
pp. 792-795 ◽  
Author(s):  
J. Hasson ◽  
A. Many
Keyword(s):  
Frequency Dependence ◽  
Shear Wave

On the source-frequency dependence of fracture-orientation estimates from shear-wave transmission experiments

2015 ◽  
Vol 114 ◽  
pp. 81-100 ◽  
Author(s):  
Leo K. Santos ◽  
J.J.S. de Figueiredo ◽  
Bode Omoboya ◽  
Jörg Schleicher ◽  
Robert R. Stewart ◽  
...  
Keyword(s):  
Frequency Dependence ◽  
Shear Wave ◽  
Wave Transmission ◽  
Fracture Orientation

scholarly journals Shear wave anisotropy from aligned inclusions: ultrasonic frequency dependence of velocity and attenuation

2013 ◽  
Vol 193 (1) ◽  
pp. 475-488 ◽  
Author(s):  
J. J. S. de Figueiredo ◽  
J. Schleicher ◽  
R. R. Stewart ◽  
N. Dayur ◽  
B. Omoboya ◽  
...  
Keyword(s):  
Frequency Dependence ◽  
Shear Wave ◽  
Ultrasonic Frequency

Ground Vibration Characteristics for High-Speed Trains on Embankments

2013 ◽  
Vol 479-480 ◽  
pp. 239-243
Author(s):  
Yit Jin Chen ◽  
Song Wei Lin ◽  
Yi Jiun Shen
Keyword(s):  
Frequency Dependence ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
High Speed ◽  
Near Field ◽  
Ground Vibration ◽  
Frequency Range ◽  
High Speed Trains ◽  
Train Speed

This study explores the characteristics of ground vibration induced by Taiwan high-speed trains on embankments. A series of field measurement data is used for evaluating near-field vibration, far-field vibration, and vibration influence distance. Various influence factors, including train speed, ground shear wave velocity, frequency dependence, and volume of the structure, are applied for evaluation. Based on the analyses, the near-field ground vibration mainly depends on the train speed, ground shear wave velocity, and frequency dependence. The far-field vibration propagation is affected by ground shear wave velocity and frequency dependence. In general, the high frequency range has the highest attenuation coefficient and the low frequency range has the lowest. The influence distance in hard ground is the farthest, whereas the soft ground is the shortest. Finally, a specific ground vibration assessment is established using these characteristics.

On the Frequency-Dependence of the Chirality Pseudoscalar of a Chiral Medium

1995 ◽  
Vol 5 (7) ◽  
pp. 913-918 ◽  
Author(s):  
Frédéric Guérin ◽  
Akhlesh Lakhtakia
Keyword(s):  
Frequency Dependence ◽  
Chiral Medium

Frequency-dependence of the magnetic transverse relaxation in a random anisotropy system: a-DyNi

1989 ◽  
Vol 50 (1) ◽  
pp. 91-98 ◽  
Author(s):  
B. Dieny ◽  
X. Labouze ◽  
B. Barbara ◽  
G. Pillion ◽  
J. Filippi
Keyword(s):  
Frequency Dependence ◽  
Transverse Relaxation ◽  
System A ◽  
Random Anisotropy

FREQUENCY DEPENDENCE OF ACOUSTIC SATURATION IN SMOKY QUARTZ

1981 ◽  
Vol 42 (C6) ◽  
pp. C6-99-C6-101
Author(s):  
R. Nava ◽  
M. Rodríguez
Keyword(s):  
Frequency Dependence

Liver Elastography in Healthy Children Using Three Different Systems – How Many Measurements Are Necessary?

2020 ◽  
Author(s):  
Anders Batman Mjelle ◽  
Anesa Mulabecirovic ◽  
Roald Flesland Havre ◽  
Edda Jonina Olafsdottir ◽  
Odd Helge Gilja ◽  
...  
Keyword(s):  
Shear Wave ◽  
Transient Elastography ◽  
Intraclass Correlation ◽  
Age Groups ◽  
Liver Stiffness ◽  
Shear Wave Elastography ◽  
Healthy Children ◽  
Significant Difference ◽  
Pediatric Liver Disease ◽  
Liver Elastography

Abstract Purpose Liver elastography is increasingly being applied in screening for and follow-up of pediatric liver disease, and has been shown to correlate well with fibrosis staging through liver biopsy. Because time is of the essence when examining children, we wanted to evaluate if a reliable result can be achieved with fewer acquisitions. Materials and Methods 243 healthy children aged 4–17 years were examined after three hours of fasting. Participants were divided into four age groups: 4–7 years; 8–11 years; 12–14 years and 15–17 years. Both two-dimensional shear wave elastography (2D-SWE; GE Logiq E9) and point shear wave elastography (pSWE; Samsung RS80A with Prestige) were performed in all participants, while transient elastography (TE, Fibroscan) was performed in a subset of 87 children aged 8–17 years. Median liver stiffness measurement (LSM) values of 3, 4, 5, 6, 7, and 8 acquisitions were compared with the median value of 10 acquisitions (reference standard). Comparison was performed for all participants together as well as within every specific age group. We investigated both the intraclass correlation coefficient (ICC) with absolute agreement and all outliers more than 10 %, 20 % or ≥ 0.5 or 1.0 kPa from the median of 10 acquisitions. Results For all three systems there was no significant difference between three and ten acquisitions, with ICCs ≥ 0.97. All systems needed 4 acquisitions to achieve no LSM deviating ≥ 1.0 kPa of a median of ten. To achieve no LSM deviating ≥ 20 % of a median of ten acquisitions, pSWE and TE needed 4 acquisitions, while 2D-SWE required 6 acquisitions. Conclusion Our results contradict recommendations of 10 acquisitions for pSWE and TE and only 3 for 2D-SWE.

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