Influence of gas law on ultrasonic behaviour of porous media under pressure.

abstract：:The objective of this study was to examine the potential of ultrasonic velocity as a rapid and nondestructive method to predict the dimensional stability of oak (Quercus petraea (Mattuschka) Lieblein) and chestnut (Castanea sativa Mill.) that are commonly used in flooring industry. Ultrasonic velocity, specific gravit...

journal_title：Ultrasonics

authors： Dündar T,Wang X,As N,Avcı E

更新日期：2016-03-01 00:00:00

abstract：:The present investigation concerns the propagation of surface waves at the vacuum-solid interface of a solid which is isotropic and thermoviscoelastic, i.e., for which the effects of heat conductivity need to be taken into account. Calculations show that, in addition to the Rayleigh wave, a thermal surface wave propag...

journal_title：Ultrasonics

authors： Deschamps M,Poncelet O,Dilhaire S,Claeys W

更新日期：2000-07-01 00:00:00

abstract：:Ultrasonic wave tunneling through seriously mismatched media, such as steel and water, is possible only when the frequency matches the resonance of the steel plate. But it is nearly impossible to realize continuous wave tunneling if the low acoustic impedance media is air because the transducer frequency cannot be mad...

journal_title：Ultrasonics

authors： Wang C,Chen Z,Cao W

更新日期：2018-01-01 00:00:00

abstract：:3D ultrasound is a promising imaging modality for clinical diagnosis and treatment monitoring. Its cost is relatively low in comparison with CT and MRI, no intensive training and radiation protection is required for its operation, and its hardware is movable and can potentially be portable. In this study, we developed...

journal_title：Ultrasonics

authors： Huang QH,Zheng YP,Lu MH,Chi ZR

更新日期：2005-01-01 00:00:00

abstract：:The results of experimental and theoretical studies of nonlinear acoustic phenomena (amplitude-dependent losses, resonant frequency shifts, damping of weak ultrasonic pulses and their carrier frequency phase delay under action of a powerful low-frequency pumping wave as well as amplitude-phase self-action of the finit...

journal_title：Ultrasonics

authors： Nazarov VE,Kolpakov AB

更新日期：2014-02-01 00:00:00

abstract：:For medical high frequency acoustic imaging purposes the reduction in size of a single transducer element for one-dimensional and even more for two-dimensional arrays is more and more limited by fabrication and cabling technology. In the fields of industrial distance measurement and simple object recognition low cost ...

journal_title：Ultrasonics

authors： Eccardt PC,Niederer K

更新日期：2000-03-01 00:00:00

abstract：:The numerical studies conducted in this paper are based on our previous research (Chen et al., 2017); through use of the spectral element method, parametric sensitivity studies of Nonlinear Coda Wave Interferometry (NCWI) are established here and divided into two parts. In the first part, CWI observables are found to ...

journal_title：Ultrasonics

authors： Chen G,Pageot D,Abraham O,Zhang Y,Chekroun M,Tournat V

更新日期：2019-11-01 00:00:00

abstract：:This paper describes fabrication and comparison of PMN-PT single crystal, PZT, and PZT-based 1-3 composite ultrasonic transducers for NDE applications. As a front matching layer between test material (Austenite stainless steel, SUS316) and piezoelectric materials, alumina ceramics was selected. The appropriate acousti...

journal_title：Ultrasonics

authors： Kim KB,Hsu DK,Ahn B,Kim YG,Barnard DJ

更新日期：2010-08-01 00:00:00

abstract：:Sonoelectrochemistry is undergoing a reemerging activity in the last years with an increasing number of papers appearing in a wide range of peer review journals. Applied studies which cover environmental treatments, synthesis or characterization of nanostructures, polymeric materials synthesis, analytical procedures, ...

journal_title：Ultrasonics

authors： González-García J,Esclapez MD,Bonete P,Hernández YV,Garretón LG,Sáez V

更新日期：2010-02-01 00:00:00

abstract：:It is well known that harmonic bounded Gaussian beams undergo a transformation into two bounded beams upon reflection on a solid immersed in a liquid. The effect is known as the Schoch effect and can be found at the Rayleigh angle for thick plates and at the different Lamb angles for thin plates. Here, a study is made...

journal_title：Ultrasonics

authors： Declercq NF

更新日期：2006-12-22 00:00:00

abstract：:The motivation for this research stems from a need for providing a non-destructive testing method capable of detecting and locating any defects and microstructural variations within armour ceramic components before issuing them to the soldiers who rely on them for their survival. The development of an automated ultras...

journal_title：Ultrasonics

authors： Kesharaju M,Nagarajah R

更新日期：2015-09-01 00:00:00

abstract：:The second and third-order Brugger elastic constants are obtained for liquids and ideal gases having an initial hydrostatic pressure p1. For liquids the second-order elastic constants are C₁₁=A+p₁, C₁₂=A-p₁, and the third-order constants are C₁₁₁=-(B+5A+3p₁), C₁₁₂=-(B+A-p₁), and C₁₂₃=A-B-p₁, where A and B are the Beye...

journal_title：Ultrasonics

authors： Cantrell JH

更新日期：2014-07-01 00:00:00

abstract：:Ultrasonic techniques have been used to measure the elastic properties of bone. Eight human tibiae were used to determine and map the elastic properties of cortical and cancellous bone. The present study shows cortical bone to be at least orthotropic in its material symmetry. The mechanical properties of cortical bone...

journal_title：Ultrasonics

authors： Rho JY

更新日期：1996-12-01 00:00:00

abstract：:When casting ceramic items in potteries, liquid 'slip' is passed from a settling tank, through overhead pipelines, before being pumped manually into the moulds. It is not uncommon for bubbles to be introduced into the slip as it passes through the complex piping network, and indeed the presence of bubbles is a major s...

journal_title：Ultrasonics

authors： Yim GT,Leighton TG

更新日期：2010-01-01 00:00:00

abstract：:The study is aimed to perform dynamic modeling of a part feeder powered by piezoelectric actuation. This part feeder consists mainly of a horizontal platform vibrated by a pair of parallel piezoelectric bimorph beams. Owing to intermittent impacts with the platform, the transported part on the platform is able to marc...

journal_title：Ultrasonics

authors： Chao PC,Shen CY

更新日期：2007-06-01 00:00:00

abstract：:We have developed an ultrasonic array sensor useable for locating air leaks in manned spacecraft and have found that this sensor locates leaks in a 1-m(2) plate to within 2 cm. The sensor consists of a 63-element multiplexed array plus a reference element, all constructed from a single PZT disc and a printed circuit b...

journal_title：Ultrasonics

authors： Holland SD,Roberts R,Chimenti DE,Song JH

更新日期：2006-12-01 00:00:00

abstract：:Recent achievements of nonlinear acoustics concerning the realization of solitons and solitary waves in crystals and their surfaces attained by nanosecond and picosecond laser ultrasonics are discussed and compared. The corresponding pump-probe setups are described, which allow an all-optical contact-free excitation a...

journal_title：Ultrasonics

authors： Hess P,Lomonosov AM

更新日期：2010-02-01 00:00:00

abstract：:The objective of this paper is to develop a nondestructive method for estimating the fracture toughness (K(IC)) of CrMoV steels used as the rotor material of steam turbines in power plants. To achieve this objective, a number of CrMoV steel samples were heat-treated, and the fracture appearance transition temperature ...

journal_title：Ultrasonics

authors： Jeong H,Nahm SH,Jhang KY,Nam YH

更新日期：2003-09-01 00:00:00

abstract：:The present study is focused on the development and characterization of an innovative substrate to optimize the axial resolution of ultrasonic transducers on a silicon substrate that is dedicated to ultrasound imaging. The substrate must efficiently dampen wave propagation to avoid degradation of the axial resolution ...

journal_title：Ultrasonics

authors： Lascaud J,Defforge T,Gautier G,Certon D

更新日期：2019-07-01 00:00:00

abstract：:We studied thickness-shear and thickness-twist vibrations of a monolithic, two-pole crystal filter made from a plate of AT-cut quartz. The scalar differential equations derived by Tiersten and Smythe for electroded and unelectroded quartz plates were employed which are valid for both the fundamental and the overtone m...

journal_title：Ultrasonics

authors： Zhao Z,Qian Z,Wang B,Yang J

更新日期：2015-04-01 00:00:00

abstract：:In medical ultrasound imaging, dynamic range (DR) is defined as the difference between the maximum and minimum values of the displayed signal to display and it is one of the most essential parameters that determine its image quality. Typically, DR is given with a fixed value and adjusted manually by operators, which l...

journal_title：Ultrasonics

authors： Lee Y,Kang J,Yoo Y

更新日期：2015-02-01 00:00:00

abstract：:A laser-based technique for the contact-free generation and detection of strongly nonlinear surface acoustic wave (SAW) pulses with amplitudes limited by the materials strength has been developed. The effects of nonlinear propagation of short elastic surface pulses with finite strength in isotropic solids, such as fus...

journal_title：Ultrasonics

authors： Lomonosov AM,Hess P

更新日期：2008-11-01 00:00:00

abstract：:A torsional piezoelectric ultrasonic sensor design is proposed in this paper and computationally tested and optimized to measure shear stiffness properties of soft tissue. These are correlated with a number of pathologies like tumors, hepatic lesions and others. The reason is that, whereas compressibility is predomina...

journal_title：Ultrasonics

authors： Melchor J,Rus G

更新日期：2014-09-01 00:00:00

abstract：:This paper presents the experimental study of a miniaturized surface acoustic waves (SAWs) rotary motor and the theoretical calculation. After the first success in SAW rotary motor operating at 9.85 MHz, a smaller rotary motor is designed. With the operating frequency of 30 MHz and the driving voltage of 120 V(p-p), t...

journal_title：Ultrasonics

authors： Cheng LP,Zhang GM,Zhang SY,Yu J,Shui XJ

更新日期：2002-06-01 00:00:00

abstract：:In many ultrasound applications-especially in the area of medical diagnostics-conventional sensors and particularly piezoelectric hydrophones do not comply with the requirements for "point detectors". It therefore suggests itself to develop methods, which allow ultrasonic fields to be reconstructed from the spatially ...

journal_title：Ultrasonics

authors： Boutkedjirt T,Reibold R

更新日期：2002-08-01 00:00:00

abstract：:Spatial dispersion is the variation of wave speed with wavelength. It sets in when the acoustic wavelength approaches the natural scale of length of the medium, which could, for example, be the lattice constant of a crystal, the repeat distance in a superlattice, or the grain size in a granular material. In centrosymm...

journal_title：Ultrasonics

authors： Every AG

更新日期：2006-12-22 00:00:00

abstract：:In this paper, a new topological structure for the Langevin-type ultrasonic transducer is proposed and investigated. The two cylindrical terminal blocks are conically shaped with four supporting plates each, and two cooling fins are disposed at the bottom of terminal blocks, adjacent to the piezoelectric rings. Experi...

journal_title：Ultrasonics

authors： Lu X,Hu J,Peng H,Wang Y

更新日期：2017-03-01 00:00:00

abstract：:Lactic acid, psychrophilic, and mesophilic bacteria, Escherichia coli, Salmonella spp. and Staphylococcus aureus were enumerated on chicken breasts after treatment with different high intensity ultrasound (frequency 40 kHz, intensity 9.6 W/cm-2) application times (0, 30, and 50 min) and packaging atmospheres (aerobic ...

journal_title：Ultrasonics

authors： Piñon MI,Alarcon-Rojo AD,Renteria AL,Carrillo-Lopez LM

更新日期：2020-03-01 00:00:00

abstract：:Clinical ultrasound images are often perceived as difficult to interpret due to image blurring and speckle inherent in the ultrasound imaging. But the image quality can be improved by deconvolution using an estimate of the point-spread function. However, it is difficult to obtain a sufficiently accurate estimate of th...

journal_title：Ultrasonics

authors： Shin HC,Prager R,Ng J,Gomersall H,Kingsbury N,Treece G,Gee A

更新日期：2009-03-01 00:00:00

abstract：:In this paper, an optimization method aimed at designing aperiodic linear sparse arrays is proposed that is based on the stochastic optimization methodology called simulated annealing. Such a method optimizes the positions and the weight coefficients of each element of a linear array in order to obtain a beam pattern ...

journal_title：Ultrasonics

authors： Trucco A

更新日期：2000-03-01 00:00:00