Surface and quasi-longitudinal acoustic waves in KTiOAsO₄ single crystals.

abstract：:The objective was to use multiple paths through the slurry to determine the lowest concentration that provided accurate attenuation measurements and to measure the velocity of sound through an effective long path. Ultrasonic attenuation measurements were obtained for slurries of silica (10 microm diameter) in water fo...

journal_title：Ultrasonics

authors： Greenwood MS,Adamson JD,Bamberger JA

更新日期：2006-12-22 00:00:00

abstract：:In order to investigate non-destructively the bonding between rough plates, the problem of Lamb waves propagating on a rough plate is addressed in this paper. Numerical analysis is performed on periodical gratings made of identical triangular grooves. If the surface profile is made up of grooves with one periodicity, ...

journal_title：Ultrasonics

authors： Leduc D,Morvan B,Hladky AC,Pareige P,Izbicki JL

更新日期：2006-12-22 00:00:00

abstract：:Speckle tracking methods overcome the major limitations of current Doppler methods for flow imaging and quantification: angle dependence and aliasing. In this paper, we review the development of speckle tracking, with particular attention to the advantages and limitations of two-dimensional algorithms that use a singl...

journal_title：Ultrasonics

authors： Bohs LN,Geiman BJ,Anderson ME,Gebhart SC,Trahey GE

更新日期：2000-03-01 00:00:00

abstract：:In this paper, the radial basis function (RBF) collocation method based on the nonlocal Eringen piezoelectricity theory is developed to compute the band structures of nanoscale multilayered piezoelectric phononic crystals taking account of nonlocal interface effects. Detailed calculations are performed for anti-plane ...

journal_title：Ultrasonics

authors： Yan Z,Wei C,Zhang C

更新日期：2017-01-01 00:00:00

abstract：:An ultrasonic technique for imaging nonlinear scatterers, such as partially-closed cracks, buried in a medium has been recently proposed. The method called fundamental wave amplitude difference (FAD) consists of a sequence of acquisitions with different subsets of elements for each line of the image. An image revealin...

journal_title：Ultrasonics

authors： Haupert S,Ohara Y,Carcreff E,Renaud G

更新日期：2019-07-01 00:00:00

abstract：BACKGROUND:Generalized coherence factor (GCF) can be adaptively estimated from channel data to suppress sidelobe artifacts. Conventionally, Fast Fourier Transform (FFT) is utilized to calculate the full channel spectrum and suffers from high computation load. In this work, autocorrelation (AR)-based algorithm is utiliz...

journal_title：Ultrasonics

authors： Shen CC,Xing YQ,Jeng G

更新日期：2016-12-01 00:00:00

abstract：:The paper presents the characteristics of vertically polarized surface waves generated in silicon substrate by acoustic coupling of bulk waves excited in a periodically patterned ZnO film on silicon. The finite element simulations are performed on the proposed patterned-ZnO/Si structure and vertically polarized modes ...

journal_title：Ultrasonics

authors： Santosh GS,Nemade HB

更新日期：2015-05-01 00:00:00

abstract：:The effect of a weak surface, near-surface and interfacial inhomogeneity on the frequency dependence of the surface wave velocity and of the SH (shear horizontal) wave reflectivity in isotropic elastic media is studied analytically and numerically. The inhomogeneity is modeled as an infinite planar layer with continuo...

journal_title：Ultrasonics

authors： Baron C,Shuvalov AL,Poncelet O

更新日期：2007-03-01 00:00:00

abstract：:In most of industries as aeronautics, aerospace and nuclear, the main part of the ultrasonic testing is carried out directly in touch with the inspected component. Among others, the cooling piping of French pressurized water reactor comprises many welding components with complex geometry: elbows, butt welds, nozzles. ...

journal_title：Ultrasonics

authors： Roy O,Mahaut S,Casula O

更新日期：2002-05-01 00:00:00

abstract：:This paper provides a derivation of the Christoffel eigenvalue equation for acoustic wave propagation in an acoustically damped piezoelectric medium. The damping tensor is shown to couple into both the stress and displacement constitutive equations. Application of the quasi-static approximation leads to an additional ...

journal_title：Ultrasonics

authors： Shane Fazzio R

更新日期：2006-12-01 00:00:00

abstract：:Mechanical properties of biological tissue represent important diagnostic information and are of histological and pathological relevance. In order to obtain non-invasively mechanical properties of tissue, we developed a real-time strain imaging system for clinical applications. The output data of this system also allo...

journal_title：Ultrasonics

authors： Khaled W,Reichling S,Bruhns OT,Ermert H

更新日期：2006-12-22 00:00:00

abstract：:Thallium bromide iodide crystal also known as KRS-5 is the well known material used in far infrared radiation applications for optical windows and lenses fabrication. The main advantage of this material is the transparency in wide band of wavelengths from 0.53 to 50μm. Despite such advantages as transparency and large...

journal_title：Ultrasonics

authors： Mantsevich SN

更新日期：2017-03-01 00:00:00

abstract：:The present study investigated the accuracy of micro-scale finite element modeling for simulating broadband ultrasound propagation in water-saturated trabecular bone-mimicking phantoms. To this end, five commercially manufactured aluminum foam samples as trabecular bone-mimicking phantoms were utilized for ultrasonic ...

journal_title：Ultrasonics

authors： Vafaeian B,Le LH,Tran TN,El-Rich M,El-Bialy T,Adeeb S

更新日期：2016-05-01 00:00:00

abstract：:Accurate characterization of the characteristic dimensions of a periodically corrugated surface using ultrasonic imaging technique is investigated both theoretically and experimentally. The possibility of accurately characterizing the characteristic dimensions is discussed. The condition for accurate characterization ...

journal_title：Ultrasonics

authors： Liu J,Declercq NF

更新日期：2013-04-01 00:00:00

abstract：:An electrical sensory perception threshold technique has been developed for use with human volunteers. This technique has been used to reproducibly quantify the effects of three different commercially available topical anaesthetic preparations on superficial sensory cells (nociceptors) in the skin. Low intensities (0....

journal_title：Ultrasonics

authors： Williams AR

更新日期：1990-05-01 00:00:00

abstract：:Exposure of Petunia hybrida cell suspensions to ultrasound at a frequency of 2.43 MHz in a standing wave field at an energy density of 70 Jm-3 (pressure amplitude of 0.78 MPa) decreased their mean viability to 35% after 20 min of sonication. A comparison of propagating wave and standing wave treatments at equal freque...

journal_title：Ultrasonics

authors： Böhm H,Anthony P,Davey MR,Briarty LG,Power JB,Lowe KC,Benes E,Gröschl M

更新日期：2000-03-01 00:00:00

abstract：:The film condensation of vapor on a cooled, downward-facing surface is a complex dynamic fluid phenomenon. This paper will describe the theoretical basis, instrumentation approach, and experimental results for a method for ultrasonic monitoring of film condensation. The ultrasound measurement system utilizes a 10 MHz ...

journal_title：Ultrasonics

authors： Pedersen PC,Cakareski Z,Hermanson JC

更新日期：2000-03-01 00:00:00

abstract：:We analyze experimentally and theoretically the sound propagation velocity of P-waves in granular media made of micrometer-size magnetite particles under an external magnetic field. The sound velocity is measured in a coherent (long-wavelength) regime of propagation after a controlled sample preparation consisting of ...

journal_title：Ultrasonics

authors： Botello FR,Quintanilla MAS,Castellanos A,Grekova EF,Tournat V

更新日期：2018-01-01 00:00:00

abstract：:Our objective was to investigate whether hemorrhage control can be achieved faster when high-intensity focused ultrasound (HIFU) is applied in the presence of ultrasound contrast agents (UCA) as compared to HIFU only application. Incisions (3 cm long and 0.5 cm deep) were produced in the livers of anesthetized rabbits...

journal_title：Ultrasonics

authors： Zderic V,Brayman AA,Sharar SR,Crum LA,Vaezy S

更新日期：2006-12-01 00:00:00

abstract：:We study thickness-shear vibration of a quartz plate connected to two piezoelectric ceramic plates with initial deformations caused by a biasing electric field. The theory for small deformations superposed on finite biasing deformations in an electroelastic body is used. It is shown that the resonant frequencies of th...

journal_title：Ultrasonics

authors： Zhou Y,Chen W,Yang J,Du J

更新日期：2011-02-01 00:00:00

abstract：:In ultrasonic non-destructive testing of materials with a coarse-grained structure the scattering from the grains causes backscattering noise, which masks flaw echoes in the measured signal. Several filtering methods have been proposed for improving the signal-to-noise ratio. In this paper we present a comparative stu...

journal_title：Ultrasonics

authors： Matz V,Smid R,Starman S,Kreidl M

更新日期：2009-12-01 00:00:00

abstract：:In this paper, the resonance frequency equation and expression of displacement amplitude magnifications of a full-wave barber ultrasonic horn are obtained. By discussing the relationships between the displacement amplitude magnifications and the geometrical dimensions, the optimized design of the horn for the largest ...

journal_title：Ultrasonics

authors： Fu Z,Xian X,Lin S,Wang C,Hu W,Li G

更新日期：2012-07-01 00:00:00

abstract：:Elastography is an imaging technique based on strain estimation in soft tissues under quasi-static compression. The stress is usually created by a compression plate, and the target is imaged by an ultrasonic linear array. This configuration is used for breast elastography, and has been investigated both theoretically ...

journal_title：Ultrasonics

authors： Souchon R,Soualmi L,Bertrand M,Chapelon JY,Kallel F,Ophir J

更新日期：2002-05-01 00:00:00

abstract：:Diversity of acoustic streaming field in a 2D rectangular chamber with a traveling wave and using water as the acoustic medium is numerically investigated by the finite element method. It is found that the working frequency, the vibration excitation source length, and the distance and phase difference between two sepa...

journal_title：Ultrasonics

authors： Tang Q,Hu J

更新日期：2015-04-01 00:00:00

abstract：:Experimental studies of thermal effects in high-intensity focused ultrasound (HIFU) procedures are often performed with the aid of fine wire thermocouples positioned within tissue phantoms. Thermocouple measurements are subject to several types of error which must be accounted for before reliable inferences can be mad...

journal_title：Ultrasonics

authors： Dasgupta S,Banerjee RK,Hariharan P,Myers MR

更新日期：2011-02-01 00:00:00

abstract：:Focused ultrasound holds promise in a large number of therapeutic applications. It has long been known that high intensity focused ultrasound can kill tissue through coagulative necrosis. However, it is only in recent years that practical clinical applications are becoming possible, with the development of high power ...

journal_title：Ultrasonics

authors： Clement GT

更新日期：2004-08-01 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：:Broken wires often occur at multiple locations in the same wire of a strand due to the recovery length, which is defined as the length of the wire taking up its full share of the axial load from the break point. The detection of broken-wire flaws at multiple locations along the same wire is investigated using guided w...

journal_title：Ultrasonics

authors： Xu J,Wu X,Sun P

更新日期：2013-01-01 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：:Both pinnae of anaesthetized male guinea-pigs were contused in a reproducible manner and one immediately treated with 0.75 MHz ultrasound at an average therapeutic intensity of 0.61 W cm-2 for a period of 2 min. The lividity and rate of resorption of the rusultant bruises were measured by a photometric method. The res...

journal_title：Ultrasonics

authors： Hustler JE,Zarod AP,Williams AR

更新日期：1978-09-01 00:00:00