Application of the ultrasonic waves in structural investigation of ferrofluid.

abstract：:One of the important issues in the field of ultrasound medical imaging using contrast agents is the development of techniques able to separate the response of the contrast media from that of the biological tissues. In the literature, one can find various solutions involving the use of multiple transmitted signals and ...

journal_title：Ultrasonics

authors： Crocco M,Palmese M,Sciallero C,Trucco A

更新日期：2009-01-01 00:00:00

abstract：:A nonlinear ultrasonic method is proposed based on a group of newly discovered wave triplets where two primary codirectional shear-horizontal SH0 waves mix in a weakly nonlinear plate and generate a cumulative S0 Lamb wave at the sum frequency. Theoretical analyses show that any combination of two primary SH0 waves wh...

journal_title：Ultrasonics

authors： Shan S,Hasanian M,Cho H,Lissenden CJ,Cheng L

更新日期：2019-07-01 00:00:00

abstract：:Three-dimensional (3D) elastic wave simulations can be used to investigate and optimize nondestructive evaluation (NDE) and structural health monitoring (SHM) ultrasonic damage detection techniques for aerospace materials. 3D anisotropic elastodynamic finite integration technique (EFIT) has been implemented for ultras...

journal_title：Ultrasonics

authors： Leckey CA,Rogge MD,Raymond Parker F

更新日期：2014-01-01 00:00:00

abstract：:The layer-multiple-scattering method is developed to study wave propagation through two-dimensional lattices of cylindrical inclusions in an elastic medium. The lattices are a series of periodically spaced infinite one-dimensional periodic gratings (or rows) of inclusions. The layer-multiple-scattering method allows t...

journal_title：Ultrasonics

authors： Robert S,Conoir JM,Franklin H

更新日期：2006-12-01 00:00:00

abstract：:Ultrasound image guided brain surgery (UGBS) requires an automatic and fast image segmentation method. The level-set and active contour based algorithms have been found to be useful for obtaining topology-independent boundaries between different image regions. But slow convergence limits their use in online US image s...

journal_title：Ultrasonics

authors： Chel H,Bora PK,Ramchiary KK

更新日期：2021-03-01 00:00:00

abstract：:Stroboscopic X-ray topography at the synchrotron beam line was used to visualize the propagation of a 580 MHz surface acoustic waves (SAW) in LiNbO3 crystals. For this purpose, the X-ray bursts coming from the synchrotron storage ring with periodicity of 5.68 MHz were synchronized with the SAW frequency in a phase-loc...

journal_title：Ultrasonics

authors： Shilo D,Zolotoyabko E

更新日期：2002-05-01 00:00:00

abstract：:Single clouds of cavitation bubbles, driven by 254kHz focused ultrasound at pressure amplitudes in the range of 0.48-1.22MPa, have been observed via high-speed shadowgraphic imaging at 1×10(6) frames per second. Clouds underwent repetitive growth, oscillation and collapse (GOC) cycles, with shock-waves emitted periodi...

journal_title：Ultrasonics

authors： Johnston K,Tapia-Siles C,Gerold B,Postema M,Cochran S,Cuschieri A,Prentice P

更新日期：2014-12-01 00:00:00

abstract：:We derive a simple expression, which gives an approximate value of the Rayleigh wave velocity in an isotropic solid. This approximation is five times better than that given by Viktorov. The velocity equation can be easily inverted in order to obtain an accurate determination of the elastic constants. This procedure ca...

journal_title：Ultrasonics

authors： Royer D,Clorennec D

更新日期：2007-03-01 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：:This paper will describe the application of a finite element (FE) code to design a test cell, in which a single transducer is used to generate acoustic cavitation. The FE model comprises a 2-D slice through the centre of the test cell and was used to evaluate the generated pressure fields as a function of frequency. I...

journal_title：Ultrasonics

authors： Gachagan A,Speirs D,McNab A

更新日期：2003-06-01 00:00:00

abstract：:Guided waves propagating in cylindrical tubes are frequently applied for the characterization of material or geometrical properties of tubes. In a tube, guided waves can propagate in the axial direction and called axial guided waves, or in the circumferential direction called circumferential guided waves. Dispersion s...

journal_title：Ultrasonics

authors： Yeh CH,Yang CH

更新日期：2011-05-01 00:00:00

abstract：:In the present work a general model of the vibrational behavior of the axle of a piezoelectric motor is proposed. In this motor, a cylinder-shaped permanent magnet, which act as a rotor, is pressed in contact with an end of a steel axle by means of the magnetic forces. The other end of the axle is fitted at the center...

journal_title：Ultrasonics

authors： Iula A,Pappalardo M

更新日期：2004-04-01 00:00:00

abstract：:For coupled structures surrounded by heavy fluids, it is difficult to obtain dispersion curves from an eigenvalue analysis, because the external fluid term in the coupled equation includes transcendental functions for frequency and wavenumber. Thus, in this study, the acoustic mass of the external fluid was approximat...

journal_title：Ultrasonics

authors： Jung BK,Ryue J,Hong C,Jeong WB,Shin KK

更新日期：2018-04-01 00:00:00

abstract：:In this paper we discuss the existence of translational and rotational displacements of a sphere submitted to a tangential contact force. On the basis of the Bogdanov and Skvortsov's works [A.N. Bogdanov, A.T. Skvortsov, Sov. Phys. Acoust. 38 (1992) 224-226.] the dispersion equation has been established and solved for...

journal_title：Ultrasonics

authors： De Billy M

更新日期：2006-12-01 00:00:00

abstract：:This work was devoted to the development of a health monitoring system assigned to aerospace applications. Those applications concerned the detection of damaging impacts and debonding between stiffeners and composite skins, since they are the major causes of in-service damage of aircraft structures. The chosen health ...

journal_title：Ultrasonics

authors： Grondel S,Assaad J,Delebarre C,Moulin E

更新日期：2004-04-01 00:00:00

abstract：:This paper presents a study on the wave surfaces of anisotropic solids. In addition to the classical and real rays, which are defined by the normal to the slowness surfaces, it is obtained complex rays, which are associated to specific inhomogeneous plane waves. Referring to the complex Christoffel's equation and to t...

journal_title：Ultrasonics

authors： Deschamps M,Poncelet O

更新日期：2002-05-01 00:00:00

abstract：:Sonothrombolysis is one of the most feasible methods for enhancing clot lysis with a recombinant tissue plasminogen activator (rt-PA) in cases of acute ischemic strokes. For safe and efficient clinical practices of sonothrombolysis, accurate estimation of ultrasound transmittance through the human skull is critical. P...

journal_title：Ultrasonics

authors： Wang Z,Komatsu T,Mitsumura H,Nakata N,Ogawa T,Iguchi Y,Yokoyama M

更新日期：2017-05-01 00:00:00

abstract：:Forced fluid flow can cause the enhancement of multibubble sonoluminescence (SL) under suitable conditions. The effect of directional flow with a circulator is similar to that of rotating flow with a stirrer. The mechanism of the enhancement is that both flows prevent cavitation bubbles from coalescing and clustering,...

journal_title：Ultrasonics

authors： Hatanaka S,Mitome H,Yasui K,Hayashi S

更新日期：2006-12-22 00:00:00

abstract：:As biotechnology develops, techniques for manipulating and separating small particles such as cells and DNA are required in the life sciences. This paper investigates on-chip manipulation of microparticles in small channels by using ultrasonic vibration. The chip consists of a rectangular glass substrate with a cross-...

journal_title：Ultrasonics

authors： Yamamoto R,Koyama D,Matsukawa M

更新日期：2017-08-01 00:00:00

abstract：:This paper describes a laser optical technique for the detection of in-plane (IP) motion of ultrasonic waves propagating in solids. This interference-based laser optical technique includes a tiny square indentation with a width of about 30 microm on the sample surface and a relatively simple optical arrangement. The c...

journal_title：Ultrasonics

authors： Yang CH,Tsai YC

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：:Aluminium sheet thickness has been calculated from ultrasonic data obtained using a send-receive, radially polarised electromagnetic acoustic transducer (EMAT). Sheets in the thickness range between 0.1 and 0.5 mm have been measured using this non-contact approach at a stand-off of up to 1.5 mm. Normal incidence shear...

journal_title：Ultrasonics

authors： Dixon S,Edwards C,Palmer SB

更新日期：2001-10-01 00:00:00

abstract：:Essential to (cardiac) 3D ultrasound are 2D matrix array transducer technology and the associated (two-stage) beam forming. Given the large number of degrees of freedom and the complexity of this problem, simulation tools play an important role. Hereto, the impulse response (IR) method is commonly used. Unfortunately,...

journal_title：Ultrasonics

authors： Ortega A,Tong L,D'hooge J

更新日期：2014-04-01 00:00:00

abstract：:Ultrasonic insertion technique (IT) is an ultrasonic technique which involves sample immersion in a solution to determine its acoustic properties. IT is normally used to determine the acoustic properties of a medical phantom. We proposed the use of IT as an alternative technique to the common contact ultrasonic techni...

journal_title：Ultrasonics

authors： Mat Daud AN,Jaafar R,Ayop SK,Yaacob MIH,Rohani MS

更新日期：2017-03-01 00:00:00

abstract：:The ultrasound-induced harmonic microbubble response spectrum is known to shift to lower frequencies with increasing tissue attenuation. We hypothesized that this shift could be reproducibly detected in received broadband radiofrequency spectra. We used an automatic Gaussian curve-fitting technique to measure the mean...

journal_title：Ultrasonics

authors： Bartleson VB,Viggen K,Asanuma T,Kinnick RR,Belohlavek M

更新日期：2003-03-01 00:00:00

abstract：:The aim of this work was to show the applicability of light diffraction tomography on airborne ultrasound in the frequency range 40 kHz-2 MHz. Seven different air-coupled transducers were measured to show the method's performance regarding linearity, absolute pressure measurements, phase measurements, frequency respon...

journal_title：Ultrasonics

authors： Almqvist M,Holm A,Persson HW,Lindström K

更新日期：2000-01-01 00:00:00

abstract：:This paper reports the development of a two-dimensional thick film lead zirconate titanate (PZT) ultrasonic transducer array, operating at frequency approximately 7.5MHz, to demonstrate the potential of this fabrication technique for microparticle manipulation. All layers of the array are screen-printed then sintered ...

journal_title：Ultrasonics

authors： Qiu Y,Wang H,Gebhardt S,Bolhovitins A,Démoré CE,Schönecker A,Cochran S

更新日期：2015-09-01 00:00:00

abstract：:Angle beam wedge transducers are widely used in nonlinear Rayleigh wave experiments as they can generate Rayleigh wave easily and produce high intensity nonlinear waves for detection. When such a transducer is used, the spurious harmonics (source nonlinearity) and wave diffraction may occur and will affect the measure...

journal_title：Ultrasonics

authors： Zhang S,Li X,Jeong H,Hu H

更新日期：2018-09-01 00:00:00

abstract：:Surface and quasi-longitudinal acoustic wave properties have been investigated in potassium titanyl arsenate (KTiOAsO₄, KTA) single crystals for the first time. Surface acoustic wave (SAW) velocity, electromechanical coupling coefficient and power flow angle characteristics have been obtained in rotated Y-cut of KTA c...

journal_title：Ultrasonics

authors： Taziev RM

更新日期：2014-02-01 00:00:00

abstract：:The propagation of ultrasound through an austenitic weld is investigated experimentally as well as in a numerical simulation. The weld is insonified at normal incidence to the fusion line with a longitudinal contact transducer. In order to experimentally trace the ultrasound through the weld, slices of different thick...

journal_title：Ultrasonics

authors： Halkjaer S,Sorensen MP,Kristensen WD

更新日期：2000-03-01 00:00:00