Results 21 to 30 of about 74,643 (325)

Time domain self-bending photonic hook beam based on freezing water droplet

open access: yesScientific Reports, 2023
Tunable optical devices are of great interest as they offer adjustability to their functions. Temporal optics is a fast-evolving field, which may be useful both for revolutionizing basic research of time-dependent phenomena and for developing full ...
Oleg V. Minin   +2 more
doaj   +1 more source

Research on frequency domain synthetic aperture focusing pipeline guided wave imaging based on phase migration

open access: yesAIP Advances, 2021
In order to overcome the limitations of traditional ultrasonic imaging methods, which cannot directly give the imaging results of defects in a pipeline and have low imaging quality, a frequency domain synthetic aperture focusing pipeline imaging method ...
Wenwu Deng   +4 more
doaj   +1 more source

Efficient Detection of Defective Parts with Acoustic Resonance Testing Using Synthetic Training Data

open access: yesApplied Sciences, 2022
Analyzing eigenfrequencies by acoustic resonance testing enables a fast screening of components regarding structural defects. The eigenfrequencies of each specific part depend on the general geometric and material properties, including tolerable part-to ...
Matthias Heinrich   +2 more
doaj   +1 more source

STDC‐Flow: large displacement flow field estimation using similarity transformation‐based dense correspondence

open access: yesIET Computer Vision, 2020
In order to improve the accuracy and robustness of optical flow computation under large displacements and motion occlusions, the authors present in this study a large displacement flow field estimation approach using similarity transformation‐based dense
Congxuan Zhang   +5 more
doaj   +1 more source

Imaging of vertical surface-breaking cracks in concrete members using ultrasonic shear wave tomography

open access: yesScientific Reports, 2023
Surface-breaking cracks in concrete pose a significant threat to the durability of built structures. They create pathways for an accelerated moisture intrusion, and the transport of environmental and chemical agents such as chloride ions, which in turn ...
Sai Teja Kuchipudi   +4 more
doaj   +1 more source

X-FASNet: cross-scale feature-aware with self-attention network for cognitive decline assessment in Alzheimer's disease

open access: yesFrontiers in Neurology
Early diagnosis of Alzheimer's disease is critical for effective therapeutic intervention. The progressive nature of cognitive decline requires precise computational methods to detect subtle neuroanatomical changes in prodromal stages.
Wenhui Chen   +9 more
doaj   +1 more source

Optical Phenomena in Mesoscale Dielectric Particles

open access: yesPhotonics, 2021
During the last decade, new unusual physical phenomena have been discovered in studying the optics of dielectric mesoscale particles of an arbitrary three-dimensional shape with the Mie size parameter near 10 (q~10).
Oleg V. Minin, Igor V. Minin
doaj   +1 more source

Nondestructive Testing with 3MA—An Overview of Principles and Applications

open access: yesApplied Sciences, 2019
More than three decades ago, at Fraunhofer IZFP, research activities that were related to the application of micromagnetic methods for nondestructive testing (NDT) of the microstructure and the properties of ferrous materials commenced.
Bernd Wolter   +2 more
doaj   +1 more source

Age-related differences in gait symmetry obtained from kinematic synergies and muscle synergies of lower limbs during childhood

open access: yesBioMedical Engineering OnLine, 2022
The age-related changes of gait symmetry in healthy children concerning individual joint and muscle activation data have previously been widely studied. Extending beyond individual joints or muscles, identifying age-related changes in the coordination of
Qiliang Xiong   +3 more
doaj   +1 more source

Handbooks describe eddy current techniques used in nondestructive testing of metal parts and components [PDF]

open access: yes, 1967
Handbooks describe eddy current techniques used in nondestructive testing of metal parts and ...

core   +1 more source

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