The acoustic emission (AE) technique was used to develop a method for the objective evaluation of crispness porous foods. six types commercial foods changed by controlling their moisture contents at levels varying humidity (i.e., dry, 22, 43, 56, 68, and 81 % relative humidity) storage environment 25 °C. As sample with high water activity (aw) expected deteriorate, physicochemical, mechanical, ...

introduction: according to world health organization (who) 2001 statistics, hearing disorders are the most common congenital disease, and the incidence rate among high-risk newborns is as much as ten times as high as that in healthy neonates. however, 78% of screening test failures are well-baby nursery babies. the joint committee on infants’ hearing (jcih) has emphasized the importance of earl...

Acoustic emission technology has been applied to many fields for many years. However, the conventional piezoelectric acoustic emission sensors cannot be used in extreme environments, such as those with heavy electromagnetic interference, high pressure, or strong corrosion. In this paper, a novel fiber-optic ring acoustic emission sensor is proposed. The sensor exhibits high sensitivity, anti-el...

Carbon / epoxy composite is one of the most useful polymer matrix composites that has special properties such as high strength-to-weight ratio, high hardness, high corrosion resistance, Resistance to nuclear radiation has high consumption in different industries such as aerospace industry. Therefor monitoring of loading of this type of composite is important. In order to determine failure mecha...

Design/methodology/approach – Two tests were performed, one on Acoustic Emission artificial signals generated on a CFRP plate and one on an Acousto Ultrasonic setup used for actively detecting impact damage. The waveforms were represented using a data reduction technique based on the Daubechies wavelet and an image processing technique using Chebyshev moments approximation, to get 32 descriptor...

This study examines the spatial distribution of various properties attributed to the cavitation field generated by a shock wave lithotripter. These properties include acoustic emission and sonoluminescence, which result from violent bubble collapse, and the degree of cell lysis in vitro, which appears to be related to cavitation. The acoustic emission detected with a 1 MHz, 12 cm diameter focus...

This paper presents the experimental results regarding acoustic emission signals measured during the injection molding of those standard test specimens commonly used for examining the shrinkage behaviour of various thermoplastic materials. In daily industrial production of different plastic products we often have to deal with various errors that practically occur on the mold primarily as a resu...

Tensile tests were carlied out on con~mercialty available NiTi alloys in order to study their mechamcal d~aracterirtics up to tlie onsct of thc superelasticity effect. Two realtimc supporting techniques, adiabatic thermal emission and acoustic emission, were employed. Thermal ekssion allowed to follow local temperature variations in the material due to loading, while acoustic emission was able ...