scholarly journals Evaluation technique of the ground attenuation property by using a PS-logging method

2012 ◽  
Vol 65 (1_2) ◽  
pp. 79-90 ◽  
Author(s):  
Dai Nobuoka ◽  
Hiroyuki Azuma ◽  
Masaaki Oba
Keyword(s):  
Evaluation Technique ◽  
Ps Logging

Évaluation technique, économique et environnementale de procédés de traitement complémentaire avancés pour l’élimination des micropolluants

2015 ◽  
pp. 67-83 ◽  
Author(s):  
S. Besnault ◽  
S. Martin-Ruel ◽  
S. Baig ◽  
B. Heiniger ◽  
M. Esperanza ◽  
...  
Keyword(s):  
Evaluation Technique

Effects of contact gap on nondestructive evaluation using magnetic measurement for ferromagnetic steel

2020 ◽  
Vol 64 (1-4) ◽  
pp. 969-975
Author(s):  
Hiroaki Kikuchi ◽  
Yuki Sato
Keyword(s):  
Magnetic Flux ◽  
Nondestructive Evaluation ◽  
Effective Permeability ◽  
Magnetic Circuit ◽  
Magnetic Measurement ◽  
Air Gap ◽  
Motive Force ◽  
Hysteresis Curve ◽  
Evaluation Technique ◽  
Ferromagnetic Steel

We investigated effects of contact gap on magnetic nondestructive evaluation technique using a magnetic single-yoke probe. Firstly, we evaluated hysteresis curves and impedance related to permeability of the material measured by a single-yoke probe, when an air gap length between the probe and specimens changes. The hysteresis curve gradually inclines to the axis of the magneto-motive force and magneto-motive force at which the magnetic flux is 0 decreases with increasing the gap length. The effective permeability also decreases with increasing the gap thickness. The incremental of gap thickness increases the reluctance inside the magnetic circuit composed of the yoke, specimen and gap, which results in the reduction of flux applying to specimen.

A standardized finite element evaluation technique

1982 ◽  
Author(s):  
J. DOW ◽  
T. HO ◽  
S. TAUGBOL
Keyword(s):  
Finite Element ◽  
Evaluation Technique

The relationship between Vs, Vp, density and depth based on PS-logging data at K-NET and KiK-net sites

2021 ◽  
Author(s):  
Fumiaki Nagashima ◽  
Hiroshi Kawase
Keyword(s):  
Standard Deviation ◽  
Seismic Velocity ◽  
Saturated Soil ◽  
P Wave ◽  
Soil Types ◽  
Depth Range ◽  
Velocity Inversion ◽  
Velocity Models ◽  
Regression Curves ◽  
Ps Logging

Summary P-wave velocity (Vp) is an important parameter for constructing seismic velocity models of the subsurface structures by using microtremors and earthquake ground motions or any other geophysical exploration data. In order to reflect the ground survey information in Japan to the Vp structure, we investigated the relationships among Vs, Vp, and depth by using PS-logging data at all K-NET and KiK-net sites. Vp values are concentrated at around 500 m/s and 1,500 m/s when Vs is lower than 1,000 m/s, where these concentrated areas show two distinctive characteristics of unsaturated and saturated soil, respectively. Many Vp values in the layer shallower than 4 m are around 500 m/s, which suggests the dominance of unsaturated soil, while many Vp values in the layer deeper than 4 m are larger than 1,500 m/s, which suggests the dominance of saturated soil there. We also investigated those relationships for different soil types at K-NET sites. Although each soil type has its own depth range, all soil types show similar relationships among Vs, Vp, and depth. Then, considering the depth profile of Vp, we divided the dataset into two by the depth, which is shallower or deeper than 4 m, and calculated the geometrical mean of Vp and the geometrical standard deviation in every Vs bins of 200 m/s. Finally, we obtained the regression curves for the average and standard deviation of Vp estimated from Vs to get the Vp conversion functions from Vs, which can be applied to a wide Vs range. We also obtained the regression curves for two datasets with Vp lower and higher than 1,200 m/s. These regression curves can be applied when the groundwater level is known. In addition, we obtained the regression curves for density from Vs or Vp. An example of the application for those relationships in the velocity inversion is shown.

Multistage Bayesian Fusion Evaluation Technique Endorsing Immersive Virtual Maintenance

Measurement ◽  
2021 ◽  
pp. 109344
Author(s):  
Ge Zhexue ◽  
Qi Zhuqi ◽  
Luo Xu ◽  
Yang Yongmin ◽  
Zhang Yi
Keyword(s):  
Evaluation Technique ◽  
Bayesian Fusion ◽  
Virtual Maintenance
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