Results 21 to 30 of about 18,542,829 (238)

Optimal Design of Sparse Array for Ultrasonic Total Focusing Method by Binary Particle Swarm Optimization

IEEE Access, 2020
Ultrasonic phased array technology is used in various fields. Traditional full phased arrays place elements in every position of a uniform lattice with half-wavelength spacing between the lattice points, so the hardware cost is very high.
Han Zhang, Bichao Bai, Jianfeng Zheng, Yun Zhou   +3 more
doaj   +1 more source

Laser-induced ultrasonic measurements for the detection and reconstruction of surface defects

Acta Acustica, 2021
Laser-induced ultrasonic measurement is a non-contact non-destructive technology that can be employed for the testing and assessment of surface defects.
Qian Feiming, Xing Guangzhen, Yang Ping, Hu Pengcheng, Zou Limin, Koukoulas Triantafillos   +5 more
doaj   +1 more source

Focusing manner and posttraumatic growth [PDF]

, 2018
© 2018, © 2018 World Association for Person-Centered & Experiential Psychotherapy & Counseling. Recent scholarship in the person-centered experiential (PCE) approach has theorized how organismic valuing might be an important process factor in the ...
Joseph, Stephen, Zwiercan, Alicja
core   +1 more source

An ellipsoidal mirror for focusing neutral atomic and molecular beams [PDF]

, 2010
Manipulation of atomic and molecular beams is essential to atom optics applications including atom lasers, atom lithography, atom interferometry and neutral atom microscopy.
Galas, J., Sondergard, E., Reisinger, T., Miranda, R., Fladischer, K., Farias, D., Ernst, W.E., Piatkowski, B., Mayrhofer, V., Surma, B., Miros, A., Holst, B., Reingruber, H., Allison, W., Sitarek, S., Allison,, W., Nieto, P., Ross, A.E., Barredo, D., MacLaren, D.A., Litwin, D., Ross A.E., Nieto P., Allison, William, Farías D., Reisinger T., Sitarek S., Barredo D., Miros A., Barredo, Daniel, Søndergård E., Fladischer K., Galas J., Surma B., Ernst W.E., Litwin D., Allison W., Piatkowski B., Miranda, Rodolfo, Nieto, Pablo, Hoist B., MacLaren D.A., Reingruber H., Farías, Daniel, MacLaren, Donald A., Mayrhofer V.   +45 more
core   +1 more source

Multi-Mode Total Focusing Method (MTFM) to Detect High-Temperature Hydrogen Attack (HTHA) – A Review

Journal of Materials Exploration and Findings, 2023
High temperature hydrogen attack (HTHA) is a commonly observed harm component in carbon steels exposed to high temperature and pressure in a hydrogen-rich environment. Hydrogen together with carbon responds to produce methane.
Anjar Oktikawati, Rini Riastuti, Nursidi Yuanto   +2 more
doaj   +1 more source

Space Optimized Plane Wave Imaging for Fast Ultrasonic Inspection with Small Active Aperture: Simulation and Experiment

Sensors, 2020
Plane wave imaging (PWI) is attracting more attention in industrial nondestructive testing and evaluation (NDT&E). To further improve imaging quality and reduce reconstruction time in ultrasonic imaging with a limited active aperture, an optimized PWI ...
Hao Sui, Pan Xu, Jinxing Huang, Hongna Zhu   +3 more
doaj   +1 more source

Ultrasonic wave propagation in heterogenous media [PDF]

, 2012
The non-destructive testing of austenitic steel welds using ultrasound is of vital importance for assessing safety critical structures such as those found in the nuclear industry.
Bird, C., Mulholland, Anthony, Harvey, G., Cunningham, Laura   +3 more
core   +3 more sources

Research on defect quantification technique of Sparse array Total focusing method imaging based on Coherence factor weighting [PDF]

EPJ Web of Conferences
Additive manufacturing technology is widely used in key components in the aerospace field due to its high manufacturing freedom and high precision. However, in the process of internal quality inspection of products, the signal attenuation caused by ...
Da Kang, Hong Zhang, Yun-Miao Zhang, Zi-Xin Wang, Zhao-Guang Ma, Shan-Shan Lin, Jun-Jie Li   +6 more
doaj   +1 more source

Plane Wave Imaging through Interfaces

Sensors, 2021
Plane Wave Imaging (PWI) has been recently proposed for fast ultrasound inspections in the Non-Destructive-Testing (NDT) field. By using a single (or a reduced number) of plane wave emissions and parallel beamforming in reception, frame rates of hundreds
Guillermo Cosarinsky, Jorge Fernandez-Cruza, Jorge Camacho   +2 more
doaj   +1 more source

Focusing with planar microlenses made of two-dimensionally varying high contrast gratings [PDF]

, 2014
The authors thank the European Union for the financial support through Marie Curie Action FP7-PEOPLE-2010-ITN Project No. 264687 “PROPHET”.We report on the focusing performance of reflective two-dimensionally varying high contrast grating lenses based on
Krauss, T.F., Stellinga, D., Klemm, A.B., Lewis, L., Martins, E.R., O'Faolain, L.   +5 more
core   +1 more source