Results 21 to 30 of about 120,102 (301)
Non-linear enhancement of laser generated ultrasonic Rayleigh waves by cracks [PDF]
, 2008 Laser generated ultrasound has been widely used for detecting cracks, surface and sub-surface defects in many different materials. It provides a non-contact wideband excitation source which can be focused into different geometries.
Cann, B. +4 more
core +1 more source
Sensors, 2023 This paper presents a method for measuring surface cracks based on the analysis of Rayleigh waves in the frequency domain. The Rayleigh waves were detected by a Rayleigh wave receiver array made of a piezoelectric polyvinylidene fluoride (PVDF) film and ...
Xiaotian Li +8 more
doaj +1 more source
The application of ultrasonic NDT techniques in tribology [PDF]
, 2005 The use of ultrasonic reflection is emerging as a technique for studying tribological contacts. Ultrasonic waves can be transmitted non-destructively through machine components and their behaviour at an interface describes the characteristics of that ...
Anderson W. +12 more
core +1 more source
The Reflective Cracking in Flexible Pavements [PDF]
Romanian Journal of Transport Infrastructure, 2013 Abstract Reflective cracking is a major concern for engineers facing the problem of road maintenance and rehabilitation. The problem appears due to the presence of cracks in the old pavement layers that propagate into the pavement overlay layer when traffic load passes over the cracks and due to the temperature variation.
openaire +3 more sources
Use of Surface Acoustic Waves for Crack Detection on Railway Track Components—Laboratory Tests
Applied Sciences, 2022 The present work investigates the technical feasibility of a condition monitoring setup aiming at the detection of gauge corner cracks (aka head checks) in pearlitic railway rails, using a wayside (i.e., stationary) setup with surface acoustic waves (SAW)
Claudia Gruber +4 more
doaj +1 more source
Characterization of a Pre-Trajan wall by integrated geophysical methods [PDF]
, 2015 The purpose of this study was to characterize a pre-Trajan mosaic-decorated wall structure located beneath the Cryptoporticus of the 'Baths of Trajan' complex in Rome. The surveyed wall is 15m long, 0.9m wide and 3 to 5m high.
Annan +22 more
core +1 more source
Electrochemical growth of three-dimensionally ordered macroporous metals as photonic crystals [PDF]
, 2010 Over the last two decades three dimensionally ordered macroporous (3-DOM) materials have turned out to be very promising in many applications ranging from optics, plasmonics, to catalyst scaffolds.
Zhu, Rong, Zhu, Rong
core +1 more source
Ultrasound Imaging of Pipeline Crack Based on Composite Transducer Array
Chinese Journal of Mechanical Engineering, 2018 Cracks, especially small cracks are difficult to be detected in oil and gas transportation pipelines buried underground or covered with layers of material by using the traditional ultrasonic inspection techniques.
Shou-Peng Song, Ying-Jie Ni
doaj +1 more source
Tunable anisotropy in inverse opals and emerging optical properties [PDF]
, 2014 Using self-assembly, nanoscale materials can be fabricated from the bottom up. Opals and inverse opals are examples of self-assembled nanomaterials made from crystallizing colloidal particles.
Alvarez-Puebla R. A. +58 more
core +1 more source
Numerical Simulation on Reflective Cracking Behavior of Asphalt Pavement [PDF]
Applied Sciences, 2021 Cracks are one of the main problems that plague road workers. A correct understanding of the internal crack propagation mechanism of asphalt pavement will help road workers evaluate the road’s working status more comprehensively and make more reasonable decisions in design, construction, and maintenance work.
Houzhi Wang +3 more
openaire +4 more sources