Results 101 to 110 of about 819 (209)
3D elastic time-frequency full-waveform inversion
, 2015 In this work I present the theory and implementation of a 3D elastic full waveform inversion. The implementation is based on the adjoint-state method using a time-frequency approach. Synthetic applications in transmission acquisition geometry show the ability of the method to reconstruct elastic parameters of different 3D subsurface structures ...
openaire +3 more sources
A physics primer on photon‐counting detectors in CT: Physics, signal formation, and performance
Medical Physics, Volume 53, Issue 8, August 2026.Abstract Photon‐counting detector CT (PCD‐CT) is moving from laboratory development to clinical deployment. However, its threshold‐bin data arise from a tightly coupled detector–readout chain that can be difficult to understand as a whole. These data are not a direct readout of photon energy, but the outcome of a sequence of physical and electronic ...
Guang‐Hong Chen, Ruiran Lai, Ke Li
wiley +1 more source
Single‐Breathhold 3D MR Elastography in the Liver, With Simultaneous R2* and PDFF Mapping
Magnetic Resonance in Medicine, Volume 96, Issue 2, Page 682-697, August 2026.Purpose To develop a sequence for the rapid acquisition of MR elastography (MRE) parameters in 3D, with simultaneous measurement of proton‐density fat fraction (PDFF) and R2* for multiparametric assessment of liver disease. Methods The proposed sequence uses an interleaved motion‐encoding scheme to acquire 3D volumes of all motion encodings and wave ...
Donovan P. Tripp +10 more
wiley +1 more source
Biodegradable, Biologically Safe Nanogenerators for Self‐Powered Bio‐Integrated Systems
Small Structures, Volume 7, Issue 8, August 2026.Biodegradable TENGs, PENGs, and hybrid systems convert biomechanical motions into electrical signals while safely degrading after use. This review highlights their working mechanisms, biodegradable material platforms, and wearable and implantable bio‐integrated applications, including motion and respiration monitoring, biosignal detection, electrical ...
Sungkeun Han +5 more
wiley +1 more source
Pressurization of Shallow Magma Reservoir Preceding Basaltic Eruptions at an Open‐Vent Volcano
Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.Abstract Open‐vent volcanoes are characterized by the persistent activity of outgassing, lava effusion and mild explosions, which is, however, occasionally interrupted by more violent explosive activity (paroxysm), for example, Stromboli (Italy). In spite of the different (two orders of magnitude) explosive intensities and different petrological magma ...
A. Ishikawa +8 more
wiley +1 more source
Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.Abstract Seismic attenuation provides sensitivity to fracture density, fluid saturation, and pore geometry that complements velocity, enabling quantitative imaging of fracture architecture and associated fluid‐pathways in near‐surface bedrock. Yet high‐resolution attenuation models remain rare in refraction studies due to amplitude‐fidelity and ...
Donggeon Kim, Guangchi Xing, Tieyuan Zhu
wiley +1 more source
Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.Abstract Fault slip occurs in both seismic and aseismic styles with spatial variability across scales, yet non‐unique source inference limits our ability to resolve slip complexity and dynamics. Here we evaluate the effect of spatial smoothing regularization in Bayesian frameworks by comparing an unregularized (BUR) approach that samples distributed ...
Xiong Zhao, Junle Jiang
wiley +1 more source
Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 4, August 2026.Abstract We develop a sensitivity‐guided, surrogate‐assisted Bayesian framework to infer fracture network parameters from elastic waves. Synthetic fracture networks characterized by power‐law length exponent a $a$, fracture density d $d$, and percolation parameter p $p$ are constructed.
Le Zhang +4 more
wiley +1 more source
Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.Abstract The diverse volcanic activity in the Alaska Peninsula section of the Alaska‐Aleutian subduction zone is presumably caused by substantial variations in mantle wedge melting or trans‐crustal processes beneath the arc. In this study, we investigate sub‐arc melting beneath the Alaska Peninsula by measuring P‐wave attenuation, as attenuation is ...
Zhuoran Zhang +4 more
wiley +1 more source
Sedimentology, Volume 73, Issue 5, Page 1378-1402, August 2026.ABSTRACT Tsunami deposits serve as geological records of past events and are essential for understanding the occurrence and dynamics of tsunamis. However, conventional research has largely focused on sandy and boulder deposits, leaving gravel‐dominated tsunami deposits comparatively underexplored; furthermore, their characteristics and formation ...
Hidetoshi Masuda +5 more
wiley +1 more source