Results 31 to 40 of about 4,479,393 (285)

“Pipe Organ” Inspired Air-Coupled Ultrasonic Transducers With Broader Bandwidth [PDF]

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2018
Piezoelectric micromachined ultrasonic transducers (PMUTs) are used to receive and transmit ultrasonic signals in industrial and biomedical applications. This type of transducer can be miniaturized and integrated with electronic systems since each element is small and the power requirements are low.
Botong Zhu, Benjamin P. Tiller, Alan J. Walker, A. J. Mulholland, James F. C. Windmill   +4 more
openaire   +5 more sources

Railroad Sleeper Condition Monitoring Using Non-Contact in Motion Ultrasonic Ranging and Machine Learning-Based Image Processing

Sensors, 2023
An ultrasonic sonar-based ranging technique is introduced for measuring full-field railroad crosstie (sleeper) deflections. Tie deflection measurements have numerous applications, such as detecting degrading ballast support conditions and evaluating ...
Diptojit Datta, Ali Zare Hosseinzadeh, Ranting Cui, Francesco Lanza di Scalea   +3 more
doaj   +1 more source

Non-destructive Methods for Damage Assessment of Composite Sandwich Structures

MATEC Web of Conferences, 2018
Sandwich structures are capable of absorbing large amounts of energy under impact loads which results in high structural crashworthiness. Comparison of detection capabilities of selected C-scan NDT methods applicable for inspections of sandwich ...
Bělský Petr, Kadlec Martin
doaj   +1 more source

Thermoacoustic phased-array radiators – Theory, characteristics, and applications

Research and Review Journal of Nondestructive Testing, 2023
Standard non-invasive acoustic non-destructive testing (NDT) methods like testing in contact or using immersion tank arrangements are limited since the probes need to be in direct contact with the test piece or using a fluid as coupling media.
Daniel Hufschläger, Dirk Gohlke, Matthias Weise, Klaas Bente, Mate Gaal   +4 more
doaj   +1 more source

Rapid Transient Control Strategies for Air-Coupled Ultrasonic Transducers

IEEE Open Journal of Ultrasonics, Ferroelectrics, and Frequency Control
Optimizing the transient response of air-coupled ultrasonic transducers is essential for applications such as ultrasonic welding, non-destructive testing, acoustic levitation, and emerging fields like gas-phase sono-photonics, where fast activation and ...
Jan H. Dorsam, Sven Suppelt, Carsten Kleber, Alexander A. Altmann, Yannick Schrodel, Daniel Schmitt, Toni Schmitt, Christoph Haugwitz, Sonja Wismath, Soren Soennecken, Christoph M. Heyl, Mario Kupnik   +11 more
doaj   +1 more source

Developing Novel Gas Discharge Emitters of Acoustic Waves in Air for Nondestructive Testing of Materials

Sensors, 2022
This study was devoted to the development of novel devices and a methodology intended for generating ultrasonic waves in an air medium by using atmospheric pressure gas discharge. In the proposed electrode system, the discharge process was accompanied by
Daria A. Derusova, Vitaly O. Nekhoroshev, Victor Y. Shpil’noi, Vladimir P. Vavilov   +3 more
doaj   +1 more source

Metastatic niche shaped by host factors influences disseminated cancer cell fate

FEBS Letters, EarlyView.
Metastasis is shaped not only by cancer cells but also by the environments they encounter. This review explores how factors such as aging, diet, the microbiome, lifestyle, and environmental exposures remodel organ‐specific niches in the lung, liver, bone, and brain, influencing where metastatic cells survive, remain dormant, or grow, and ultimately ...
Gwennan Delyth Ward, Álvaro Ruiz‐Tabas, Patricia Altea‐Manzano   +2 more
wiley   +1 more source

Tumour–host interactions in Drosophila: mechanisms in the tumour micro‐ and macroenvironment

Molecular Oncology, EarlyView.
This review examines how tumour–host crosstalk takes place at multiple levels of biological organisation, from local cell competition and immune crosstalk to organism‐wide metabolic and physiological collapse. Here, we integrate findings from Drosophila melanogaster studies that reveal conserved mechanisms through which tumours hijack host systems to ...
José Teles‐Reis, Tor Erik Rusten
wiley   +1 more source

Targeting the EpCAM‐AXL axis to overcome drug resistance in lung cancer

Molecular Oncology, EarlyView.
Lung cancer cells often evade therapy by hijacking signaling pathways. We reveal that cleaved EpCAM (sEpCAM) stabilizes the oncogenic protein AXL, driving NF‐κB and STAT3‐mediated chemoresistance. This EpCAM‐AXL axis identifies a high‐risk patient subset with poor prognosis.
Alexa Guerrero‐Alba, Mark Shacker, Timothy P. Fleming, Michael A. Smith, Ross M. Bremner, Narendra V. Sankpal   +5 more
wiley   +1 more source

Air-Coupled Ultrasonic Receivers with High Electromechanical Coupling PMN-32%PT Strip-Like Piezoelectric Elements

Sensors, 2017
For improvement of the efficiency of air-coupled ultrasonic transducers PMN-32%PT piezoelectric crystals which possess very high piezoelectric properties may be used.
Rymantas J. Kazys, Reimondas Sliteris, Justina Sestoke   +2 more
doaj   +1 more source