Results 81 to 90 of about 5,216 (194)

A Semi‐Analytical Approach to Model Borehole Tube Waves for Interpretation of Downhole Seismic Data in Fault Zones

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 3, March 2026.
Abstract Understanding fault‐zone permeability is crucial in model‐based assessment of fluid migration, earthquake nucleation, and hydrothermal or hydrocarbon systems. Vertical seismic profiling (VSP) often captures Stoneley (tube) waves generated by fluid‐formation coupling in and around a borehole.
Shohei Minato, Ranajit Ghose, Tsutomu Kiguchi   +2 more
wiley   +1 more source

Non‐Rayleigh Statistics of Ultrasonic Backscattered Echo from Tissues [PDF]

, 1994
The envelope of the backscattered signal from tissues can exhibit non‐Rayleigh statistics if the number density of scatterers is small or if the variations in the scattering cross sections are random. The K distribution which has been used extensively in
Molthen, Robert C., Narayanan, V. Manjo, Reid, J. M., Shankar, P. M.   +3 more
core   +1 more source

Comparing the resolution of Bartlett and MVDR estimators for bottom parameter estimation using pressure and vector sensor short array data [PDF]

, 2013
This work compares the resolution of a pressure and vector sensor based conventional Bartlett estimator, with their MVDR estimator counterparts, in the context of bottom characterization with a short vertical array. Santos et al. [1]demonstrated the gain
Felisberto, P., Jesus, S. M., Rodríguez, O. C., Santos, P., Schneiderwind, J.   +4 more
core   +1 more source

Multichannel Wavefield Reconstruction With Physics‐Informed Neural Networks and Transfer Learning

Geophysical Prospecting, Volume 74, Issue 3, March 2026.
ABSTRACT Multi‐component seismic data contain rich information essential for accurate subsurface imaging, but they are often sparse due to acquisition limitations and include noise. Robust interpolation techniques are therefore crucial to reconstruct missing traces and preserve wavefield integrity for reliable analysis and inversion. Thus, we propose a
Francesco Brandolin, Matteo Ravasi, Tariq Alkhalifah   +2 more
wiley   +1 more source

Investigating ultrasound–light interaction in scattering media [PDF]

, 2020
Significance: Ultrasound-assisted optical imaging techniques, such as ultrasound-modulated optical tomography, allow for imaging deep inside scattering media. In these modalities, a fraction of the photons passing through the ultrasound beam is modulated.
Brake, Joshua, Cua, Michelle, Huang, Yujia, Liu, Yan, Yang, Changhuei   +4 more
core  

Use of beamforming for detecting an acoustic source inside a cylindrical shell filled with a heavy fluid [PDF]

, 2014
International audienceThe acoustic detection of defects or leaks inside a cylindrical shell containing a fluid is of prime importance in the industry, particularly in the nuclear field.
Gastaldi, O, Guyader, Jean-Louis, Maxit, Laurent, Moriot, J, Périsse, J   +4 more
core   +4 more sources

A Conceptual Framework and Methods for Studying the Connectivity of Fishes

Fish and Fisheries, Volume 27, Issue 2, Page 342-369, March 2026.
ABSTRACT Connectivity is a multifaceted concept that has important implications for the management and conservation of marine and freshwater fishes. We developed a conceptual framework that encompasses multiple, interrelated categories of connectedness, including landscape (e.g., structural, functional) connectivity and ecological (e.g., trophic ...
Jordanna N. Bergman, Jessica A. Robichaud, Jasper McCutcheon, Michael T. Booth, Brendan Campbell, Grace A. Casselberry, Cienna R. Cooper, Bronwyn M. Gillanders, Lucas P. Griffin, Edward Hale, Luc LaRochelle, Karen J. Murchie, Mary Peacock, Reid G. Swanson, Simon D. Stewart, Ryan. J. Woodland, Daniel P. Zielinski, Steven J. Cooke, Morgan L. Piczak   +18 more
wiley   +1 more source

Harnessing Data for Flood Prediction: A Systematic Review of Forecasting Techniques and Information Sources

Journal of Flood Risk Management, Volume 19, Issue 1, March 2026.
ABSTRACT Flood forecasting has undergone significant development over the past two decades, with researchers exploring a range of innovative approaches to quantify both the hazards and risks associated with flood events across a range of magnitudes and frequencies.
Amirali Davary, Pete Melville‐Shreeve, Richard Brazier, Albert S. Chen   +3 more
wiley   +1 more source

Research on the direction estimation algorithm of vector hydrophones under near-field and Far-field Reflecting Boundary

International Journal of Metrology and Quality Engineering
To address the impact of reflection boundaries and port and starboard ambiguity on passive sonar positioning, a method of vector hydrophone hybrid source positioning under different reflection boundaries is proposed. When the reflection boundary is close
Shang Zhenzhen, Zhang Xiaoyong, Kou Hairong, Yang Libo, Zhang Guojun   +4 more
doaj   +1 more source

Novel Bio-Logging Tool for Studying Fine-Scale Behaviors of Marine Turtles in Response to Sound

, 2017
Increases in the spatial scale and intensity of activities that produce marine anthropogenic sound highlight the importance of understanding the impacts and effects of sound on threatened species such as marine turtles.
Domit, Camila, Fuentes, Mariana M. P. B., Hall, Michael, Mann, David, Nowacek, Douglas P., Piniak, Wendy Dow, Tyson, Reny B.   +6 more
core   +1 more source