Results 21 to 30 of about 8,894 (241)

Lamb waves detection through phi-OTDR for structural health monitoring

, 2022
In this paper, a distributed acoustic sensor based on phase-sensitive optical time-domain reflectometry (-OTDR) in optical fibers, for the detection of the Lamb waves generated by a piezo-ceramic actuator in an aluminum plate is investigated.
De Luca A., Cerri E., Vallifuoco R., Zeni L., Zahoor R., Perfetto D., Caputo F., Minardo A.   +7 more
core   +1 more source

Impedance‐Matched High‐Overtone Thickness‐Shear Bulk Acoustic Resonators With Scalable Mode Volume

Advanced Science, EarlyView.
A bottom‐electrode‐free high‐overtone bulk acoustic resonator is achieved by lateral excitation of antisymmetric thickness‐shear modes on a lithium‐niobate‐on‐silicon platform. Planar electrode geometry eliminates conventional loading along the resonance path and confines acoustic energy within the electrode gap.
Zi‐Dong Zhang, Zhen‐Hui Qin, Yi‐Han He, Yun‐Fei Cheng, Hao Yan, Si‐Yuan Yu, Ming‐Hui Lu, Yan‐Feng Chen   +7 more
wiley   +1 more source

A phased array-based method for damage detection and localization in thin plates

, 2009
A method for damage localization based on the phased array idea has been developed. Four arrays oftransducers are used to perform a beam-forming procedure.
Irina Trendafilova, Wandowski, T., Trendafilova, I., Ostachowicz, W.M., Pawel Malinowski, Wieslaw Ostachowicz, Malinowski, P., Tomasz W   +7 more
core   +1 more source

Defect feature extraction using surface wave interactions and time-frequency behavior [PDF]

, 2010
In this paper we exploit the interaction of ultrasonic surface waves with surface cracks in order to extract defect characteristics. An experimentally validated computer model was developed to simulate laser generated surface waves interacting with ...
Edwards, R. S. (Rachel S.), Donald O. Thompson, Dale E. Chimenti, Rosli, M. H., B. Dutton, M. H. Rosli, Dutton, B. (Ben), R. S. Edwards   +7 more
core   +1 more source

Mutual Interactions of Lamb Waves in Nonlinear Elastic Plates

, 2022
The mutual interactions of Lamb waves in nonlinear elastic plates are studied in this article. Many researchers have investigated the interactions of Lamb wave modes at nonlinear higher harmonics.
Hongfeng Hou, Guixian Zhang, Lidong Wang, Shuyi Ma   +3 more
core   +1 more source

Ultrasonic Rainbow: A Meta‐Transducer for Frequency‐Selective Elastic Wave Control via Dithering‐Based Wavenumber Tuning

Advanced Intelligent Systems, EarlyView.
A piezoelectric meta‐transducer generates an ultrasonic rainbow, steering guided elastic waves to different angles according to frequency. A dithering‐based binary electrode design enables a closer realization of the target wavenumber filter, improving directional purity and suppressing unwanted lobes. Numerical and experimental validation demonstrates
Masoud Mohammadgholiha, Jochen Moll, Kilian Tschöke, Carsten Kruska, Sylvia E. Gebhardt, Luca De Marchi   +5 more
wiley   +1 more source

Cross-structures Deep Transfer Learning through Kantorovich potentials for Lamb Waves based Structural Health Monitoring [PDF]

, 2023
In Lamb Waves based Structural Health Monitoring (LWSHM) of composite aeronautic structures, Deep Learning (DL) methods have proven to be promising to monitor damage using the signals collected by piezoelectric sensors (PZTs).
MONTEIRO, Eric, MECHBAL, Nazih, POSTORINO, Hadrien, RÉBILLAT, Marc   +3 more
core   +1 more source

Exploring the lichenization continuum through the marine tripartite symbiosis of Collemopsidium pelvetiae

American Journal of Botany, EarlyView.
Abstract Premise Symbioses between lichen‐forming fungi and brown algae (phaeophytes) are extremely rare. We investigated the interactions between the marine fungus Collemopsidium pelvetiae and its two photosynthetic partners, the brown alga Pelvetia canaliculata and a cyanobacterial symbiont to address questions on symbiosis biology, lichenization ...
Sergio Pérez‐Ortega, Rúdiger Ortiz‐Álvarez, Jacek Wierzchos, Miguel Blázquez, Alain Gérault, Asunción de los Ríos   +5 more
wiley   +1 more source

Recent Advances in Stimulated Brillouin Scattering in Integrated Photonics

Advanced Physics Research, EarlyView.
This review systematically surveys recent advances in stimulated Brillouin scattering (SBS) within integrated photonics. It begins by elucidating the fundamental mechanisms of stimulated coupling between photons and acoustic phonons in nanoscale waveguides, enhanced by the photoelastic and moving boundary effects.
Songyue Liu, Qi Lu, Pan Hu, Yuan Zhong, Yu He, Yaojing Zhang, Young‐Ik Sohn, Yikai Su, Lu Sun   +8 more
wiley   +1 more source

The influence of rivers on seabird foraging ecology

Biological Reviews, EarlyView.
ABSTRACT Rivers act as vital arteries to the world's oceans, delivering fresh water and nutrients that sustain marine ecosystems. Globally, river flow increasingly is being altered by climate change and anthropogenic pressures; yet the significance of rivers to predatory marine species, such as seabirds, and the extent to which river‐related changes ...
Julia B. Morais, Andre Chiaradia, Richard D. Reina   +2 more
wiley   +1 more source