Results 81 to 90 of about 2,327,371 (190)

Statistics and control of waves in disordered media

, 2015
Fundamental concepts in the quasi-one-dimensional geometry of disordered wires and random waveguides in which ideas of scaling and the transmission matrix were first introduced are reviewed.
Davy, Matthieu, Genack, Azriel Z., Shi, Zhou   +2 more
core   +2 more sources

Screening of Corrosion in Storage Tank Walls and Bottoms Using an Array of Guided Wave Magnetostrictive Transducers

Sensors
Aboveground storage tanks are used to store various fluids and chemicals for many industrial purposes. According to API standard 653, the structural integrity of these tanks must be regularly assessed. The U.S.
Sergey Vinogradov, Nikolay Akimov, Adam Cobb, Jay Fisher   +3 more
doaj   +1 more source

Integrated Numerical Modelling System for Extreme Wave Events at the Wave Hub Site [PDF]

, 2013
This paper examines an extreme wave event which occurred during a storm at the Wave Hub site in 2012. The extreme wave of 9.57 m height was identified from a time series of the heave data collected by an Oceanor Seawatch Mini II Buoy deployed at the site.
Conley, D, Greaves, D, Hann, M, Magagna, D, Magar, V, Ransley, EJ, Simmonds, D, Vyzikas, T   +7 more
core   +1 more source

Golay-based total focusing method using a high-frequency, lead-free, flexible ultrasonic array to improve industrial inspections [PDF]

High frequency (>15 MHz) ultrasound arrays have attracted considerable interest in recent years due to their ability to provide images with enhanced spatial resolution, offering higher sensitivity to smaller defects in materials and structures ...
Gachagan, Anthony, Germano, Elmergue, Hughes, David, Kwok Ho, Lam, Lines, David, Mohseni, Ehsan, Tabatabaeipour, Morteza, Trodden, Heather   +7 more
core  

Device for measuring the contour of a surface [PDF]

, 1978
Light from a source is imaged by a lens onto a surface so that the energy from the source is concentrated into a spot. As the spot across the surface is scanned, the surface moves relative to the point of perfect focus.
Burcher, E. E., Katzberg, S. J., Kelly, W. L., IV   +2 more
core   +1 more source

Research on ultrasonic phased array total focusing multi-mode fusion method

Journal of Physics: Conference Series
Abstract Welded seams are one of the important structural forms in the construction of industrial equipment. But during use, hazardous defects may occur within the weld. Ultrasonic phased-array total focusing method (TFM) is a relatively new post-processing imaging method that can locate defects.
Yangguang Bu, Jingwei Cheng, Wei Chen, Rui Li, Zhe Wang, Haibin Wang, Chang Yan, Tian Ji, Kang Li, Zhe Chen   +9 more
openaire   +1 more source

Training gilts to use a feeder station [PDF]

Group housing of dry sows is compulsory in Europe from 2013 onwards. Many pig farmers who still have to convert to group housing fear the resulting demand on their ability to interact with individual animals.
Kiezebrink, M.C., Spoolder, H.A.M., Vermeer, H.M., Werf, J.T.N., van der   +3 more
core   +1 more source

HDPE pipe butt fusion joint defects ultrasonic automatic detection via phase coherence TFM imaging and improved YOLOX model

Polymer Testing
Detection of butt fusion joints is essential for in-service high-density polyethylene (HDPE) natural gas pipe operating safety. A directivity-compensated circular coherence factor weighted total focusing method (D-CCF-TFM) algorithm is presented to solve
Haowen Zhang, Tianliang Chen, Qiang Wang, Zhaodong Zhang, Quanjing Xiao, Yanlei Liu   +5 more
doaj   +1 more source

Research on Acoustic Field Correction Vector-Coherent Total Focusing Imaging Method Based on Coarse-Grained Elastic Anisotropic Material Properties

Sensors
This study aims to address the challenges posed by uneven energy amplitude and a low signal-to-noise ratio (SNR) in the total focus imaging of coarse-crystalline elastic anisotropic materials.
Tianwei Zhao, Ziyu Liu, Donghui Zhang, Junlong Wang, Guowen Peng   +4 more
doaj   +1 more source

Research on the Vector Coherent Factor Threshold Total Focusing Imaging Method for Austenitic Stainless Steel Based on Material Characteristics

Metals
The degree of anisotropy and heterogeneity in coarse-grained materials significantly affects ultrasonic propagation behavior and scattering. This paper proposes a vector coherent factor threshold total focusing imaging method (VCF-T-TFM) for austenitic ...
Tianwei Zhao, Ziyu Liu, Donghui Zhang, Junlong Wang, Guowen Peng   +4 more
doaj   +1 more source