scholarly journals Feasibility of EUS-guided shear-wave measurement: A preliminary clinical study

2019 ◽  
Vol 8 (3) ◽  
pp. 215 ◽  
Author(s):  
Yoshiki Hirooka ◽  
Eizaburo Ohno ◽  
Hiroki Kawashima ◽  
Takuya Ishikawa
Keyword(s):  
Clinical Study ◽  
Shear Wave ◽  
Wave Measurement

Tu1397 USEFULLNESS OF EUS-GUIDED SHEAR-WAVE MEASUREMENT (EUS-SWM) FOR THE ASSESSMENT OF ACTIVITIES OF AUTOIMMUNE PANCREATITIS; A PROSPECTIVE EXPLORATORY STUDY

2019 ◽  
Vol 89 (6) ◽  
pp. AB608
Author(s):  
Eizaburo Ohno ◽  
Yoshiki Hirooka ◽  
Hiroki Kawashima ◽  
Takuya Ishikawa ◽  
Hiroyuki Tanaka ◽  
...  
Keyword(s):  
Shear Wave ◽  
Autoimmune Pancreatitis ◽  
Exploratory Study ◽  
Wave Measurement

Geogrid Stabilization of Unbound Aggregates Evaluated Through Bender Element Shear Wave Measurement in Repeated Load Triaxial Testing

2020 ◽  
Vol 2674 (3) ◽  
pp. 113-125
Author(s):  
Mingu Kang ◽  
Joon Han Kim ◽  
Issam I. A. Qamhia ◽  
Erol Tutumluer ◽  
Mark H. Wayne
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Resilient Modulus ◽  
Triaxial Tests ◽  
Triaxial Testing ◽  
Bender Element ◽  
Wave Measurement ◽  
Repeated Load ◽  
Repeated Load Triaxial

This paper describes the use of the bender element (BE) shear wave measurement technology for quantifying the effectiveness of geogrid stabilization of unbound aggregate materials with improved mechanical properties from repeated load triaxial testing. Crushed stone aggregate specimens were prepared with three different gradations, that is, upper bound (UB), mid-range engineered (ENG), and lower bound, according to the dense graded base course gradation specification in Illinois. The specimens were compacted at modified Proctor maximum dry densities and optimum moisture contents. Two geogrids with different triaxial aperture sizes were placed at specimen mid-height, and unstabilized specimens with no geogrid were also prepared for comparison. To measure shear wave velocity, three BE pairs were placed at different heights above geogrid. Repeated load triaxial tests were conducted following the AASHTO T307 standard resilient modulus test procedure, while shear wave velocity was measured from the installed BE pairs. After initial specimen conditioning, and at low, intermediate, and high applied stress states, both the resilient moduli and accumulated permanent strains were determined to relate to the geogrid local stiffening effects in the specimens quantified by the measured shear wave velocities. The resilient modulus and shear wave velocity trends exhibited a directly proportional relationship, whereas permanent strain and shear wave velocity values were inversely related. The enhancement ratios calculated for the geogrid stabilized over the unstabilized specimens showed significant improvements in mechanical behavior for the UB and ENG gradations, and a maximum enhancement was achieved for the engineered gradation specimens stabilized with the smaller aperture geogrid.

scholarly journals VsN, a Reliability-index of Shear-wave Measurement in Sonoelastography, Is Useful for the Diagnosis of Thyroid Tumor Malignancy

In Vivo ◽  
2021 ◽  
Vol 36 (1) ◽  
pp. 264-273
Author(s):  
TOMOO JIKUZONO ◽  
OSAMU ISHIBASHI ◽  
SHOKO KURE ◽  
CHIAKI ITOH ◽  
TETSU YAMADA ◽  
...  
Keyword(s):  
Shear Wave ◽  
Reliability Index ◽  
Thyroid Tumor ◽  
Wave Measurement

Simulation of downhole and crosshole seismic tests on sand using the hydraulic gradient similitude method

1990 ◽  
Vol 27 (4) ◽  
pp. 441-460 ◽  
Author(s):  
Li Yan ◽  
Peter M. Byrne
Keyword(s):  
Wave Propagation ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Stress Ratio ◽  
Velocity Ratio ◽  
Hydraulic Gradient ◽  
Empirical Equations ◽  
Wave Measurement

A method of simulating downhole and crosshole seismic shear-wave tests in a model under controlled stress conditionsis described. The downhole and shear wave in horizontal plane (SH) crosshole shear waves are generated and received along the principal stress axes using piezoceramic bender elements. The K0in situ stress conditions, including loading and unloading stress paths, are simulated by the hydraulic gradient similitude method, which allows high stresses simulating field conditions to be obtained. The horizontal stress during the tests is directly measured by a lateral total-stress transducer. The test data are used to evaluate various published empirical equations that relate shear-wave velocity and soil stress state. It is found that although the various empirical equations can predict the in situ shear-wave velocity profile reasonably well, only the equation that relates the shear-wave velocity to the individual principal stresses in the directions of wave propagation and particle motion can predict the variation of the velocity ratio between the downhole and SH crosshole tests. It was also found that the stress ratio has some effects on the downhole (or shear wave in vertical plane (SV) crosshole) shear-wave velocity, but not on the SH crosshole shear-wave velocity. This indicates that it is only the stress ratio in the plane of wave propagation that is important to the shear-wave velocity. Comparison between the downhole and SH crosshole shows that structure anisotropy is in the order of 10%. In addjtion, K0 values are predicted from shear-wave measurement and compared with measured ones. The difficulties in obtaining K0 values from shear-wave measurement are also discussed. Key words: hydraulic gradient, model tests, downhole and crosshole shear-wave tests, sand.

Laboratory and Field Shear Wave Measurement at a Reclaimed Site in West Taiwan

2000 ◽  
Vol 23 (1) ◽  
pp. 21 ◽  
Author(s):  
RC Chaney ◽  
KR Demars ◽  
L-K Chien ◽  
Y-N Oh
Keyword(s):  
Shear Wave ◽  
Wave Measurement

Ruling-in and ruling-out significant fibrosis and cirrhosis using a shear wave measurement method

2017 ◽  
Vol 49 (1) ◽  
pp. e23
Author(s):  
G. Ferraioli ◽  
L. Maiocchi ◽  
R. Lissandrin ◽  
C. Tinelli ◽  
A. De Silvestri ◽  
...  
Keyword(s):  
Shear Wave ◽  
Measurement Method ◽  
Significant Fibrosis ◽  
Wave Measurement
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