Showing papers in "Ultrasonics in 2005"

TL;DR: A methodology for applying diffuse ultrasonic waves to the problem of detecting structural damage in the presence of unmeasured temperature changes and it is shown that a probability of detection of over 95% can be achieved with a small number of baseline waveforms.

TL;DR: The AIC-picker is compared to an automatic onset detection algorithm based on the Hinkley criterion and also adapted to acoustic emissions and produces sufficient reliable results for ultrasound signals where the deviation from the manual picks varies between 2% and 4%.

TL;DR: Cavitation bubbles appear to be important during the fragmentation process, possibly melting any ice crystals in their path, and Flow patterns around cavitation bubbles have also been observed, and these may be responsible for the fragmentation of ice crystals.

TL;DR: Results from an experimental study concerning wave propagation in cementitious materials show that aggregate content play an important role in wave propagation increasing considerably the wave velocity, while the aggregate size seems to control the attenuation observed.

TL;DR: It is anticipated that acoustic trapping using integrated transducers can be exploited in miniaturised total chemical analysis systems (microTAS), where e.g. microbeads with immobilised antibodies can be trapped in arrays and subjected to minute amounts of sample followed by a reaction, detected using fluorescence.

TL;DR: The effect of ultrasound at various energy levels on the conduction properties of neural tissue is explored in this in vitro study and it is shown that the effect of lower energy ultrasound increases both the CV and theCAP amplitude and that the reduction in the CAP amplitude for higher energy ultrasound is associated largely with ultrasonic thermal effects.

TL;DR: A meridional-array scheme which mimics a single line of transducers along the exterior surface of the pipe in the axial direction is described, and proof of concept results on a pipe sample with an internal wall-thinning are shown.

TL;DR: A portable freehand 3D ultrasound imaging system for the assessment of musculoskeletal body parts and has been successfully used to obtain the volume images of a fetus phantom, the fingers and forearms of human subjects.

TL;DR: Experimental results indicate that ultrasonic-vibration can considerably reduces the compressive forces during hot upsetting, and the cooling mechanism used to solve the problem of high temperature.

TL;DR: This study assesses wood quality of standing trees with ultrasonic velocity methods using scattering based techniques and high resolution imaging techniques developed for imaging abnormalities induced by biological attacks of fungi or insects in standing trees.

TL;DR: Multiple acoustic wave mode method has been proposed as a new modality in axial bone QUS and allows assessment of changes in both the material properties related to porosity and mineralization as well as the cortical thickness influenced by resorption from inner layers, which are equally important in diagnostics of osteoporosis and other bone osteopenia.

TL;DR: This paper addresses the evaluation of the performance of ultrasonic motors as a function of input parameters such as the driving frequency, voltage input and pre-load on the rotor by means of a finite element three-dimensional model.

TL;DR: The present study indicates that roughness measurement may constitute a practical method for monitoring damage in industrial ultrasonic cleaners.

TL;DR: The ultrasonic approach can provide basis for a convenient, lightweight system in sports medicine for monitoring total body hydration during long-term endurance exercise in hot conditions, as well as for edemas monitoring and other medical applications.

TL;DR: The quantitative influence of the rheological fluid properties on the pressure thresholds for inertial cavitation is investigated and it is found that these critical pressure amplitudes are clearly reduced as the Deborah number is increased.

TL;DR: Results show how the damping due to absorption, the change of the interior fluid inside the shells' hollow regions, and the exterior fluid surrounding their structures, affect the acoustic radiation force.

TL;DR: The objective of this study is to explore the potential of three parameters together (attenuation coefficient, US speed and integrated backscatter coefficient-IBC) to discriminate healthy and fibrosis subgroups in liver tissue.

TL;DR: The large improvement in the segmentation results obtained reveals that the multiparametric segmentation scheme proposed in this study can be a reliable tool for the processing of noisy ultrasound data.

TL;DR: Based on the equivalent circuit theory, the load characteristics of high power piezoelectric ultrasonic sandwich transducers are studied and it is shown that the effect of load on the resonance frequency of Sandwich transducers with different structures is different.

TL;DR: 100% cotton materials of different forms such as raw fibre, ring-spun yarns and knitted fabrics produced from these cottons, were treated with hydrogen peroxide in two different concentrations andWhiteness Index of the samples were measured spectrophotometrically and the overall results were compared.

TL;DR: It has been found that the tangential/normal stiffness ratio and the shear/longitudinal reflection ratio of the contact interface are consistent with the predictions of an existing theoretical model for kissing bond interfaces.

TL;DR: A novel approach based on the short time Fourier transform (STFT)--a time-frequency analysis, to estimate the ultrasonic dispersion and attenuation, which eliminates the ambiguity issue in phase angle calculation and makes the phase velocity pedagogically intuitive for novice users.

TL;DR: An experimental study of the density and ultrasonic velocity in the ternary mixture (water-ethanol-saccharose) is presented and a semiempirical approach was proposed to improve the efficiency of theoretical models when dealing with mixtures of associated liquids.

TL;DR: This work shows how the new MINA model allows to simulate the anisotropic heterogeneous structure in a more realistic manner and introduces the simulated grains structure and the real one, obtained by macrographs, into the ATHENA propagation code.

TL;DR: The sharp resonance peaks observed for the dense piezoceramic hydrophone has broadened to a large extent for porous pieZoceramics, indicating higher losses, and the flat frequency response suggests that the 3-3 piezocomposites are useful for wide-band hydrophone applications.

TL;DR: It is shown that a dense random set of scatterers can be substituted by an equivalent one with a much smaller number of periodic scatterer, which is able to give rise to the same B-mode image and the same speckle pattern, for a given ultrasound pulse.

TL;DR: A semi-analytical model for multiple mode axially symmetric wave propagation in finite solid cylindrical waveguides is presented and designed as a tool for predicting and interpreting experimental signals.

TL;DR: The outcome of this work shows that when fully developed, the FO probes will be well suited for high frequency measurements of ultrasound fields and will be able to complement the data collected by the current finite aperture piezoelectric PVDF hydrophones.

TL;DR: This paper describes the use of non-contact ultrasound for the evaluation of concrete and shows that there is a correlation between humidity and speed of sound, allowing a correction factor for humidity to be derived.

TL;DR: It is shown that High-Intensity Focused Ultrasound (HIFU) can effectively control bleeding from injuries to solid organs such as liver, spleen, and lung and result in a statistically significant shorter HIFU application time for hemostasis.