Lamb wave propagation in a plate with a grooved surface with several spatial periodicities.

abstract：:This paper describes an optimization method of the top electrode size for a thin film matrix ultrasonic transducer (M-UT) in the frequency range above 200 MHz. The goal of this work is to design an optimal top electrode size for an M-UT providing the maximal output peak-peak voltage (V(PP)) and the maximal signal-to-n...

journal_title：Ultrasonics

authors： Wei Y,Herzog T,Heuer H

更新日期：2013-03-01 00:00:00

abstract：:In most applications of MEMS the mechanical properties of the used materials are key parameters for the perfect working of the microsystems. Measuring bulk acoustic waves excited in MEMS structures with ultra-short laser pulses is a powerful method for the accurate and non-destructive evaluation as well as for the cha...

journal_title：Ultrasonics

authors： Profunser DM,Vollmann J,Dual J

更新日期：2004-04-01 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：:Effective receive beamforming in medical ultrasound imaging is important for enhancing spatial and contrast resolution. In current ultrasound receive beamforming, a constant sound speed (e.g., 1540m/s) is assumed. However, the variations of sound speed in soft tissues could introduce phase distortions, leading to degr...

journal_title：Ultrasonics

authors： Yoon C,Lee Y,Chang JH,Song TK,Yoo Y

更新日期：2011-10-01 00:00:00

abstract：:In cancellous bone, longitudinal waves often separate into fast and slow waves depending on the alignment of bone trabeculae in the propagation path. This interesting phenomenon becomes an effective tool for the diagnosis of osteoporosis because wave propagation behavior depends on the bone structure. Since the fast w...

journal_title：Ultrasonics

authors： Nagatani Y,Mizuno K,Saeki T,Matsukawa M,Sakaguchi T,Hosoi H

更新日期：2008-11-01 00:00:00

abstract：:An ultrasonic method of acoustic parameter evaluation for porous materials saturated by air (or any other gas) is discussed. The method is based on the evolution of speed of sound and the attenuation inside the material when the static pressure of the gas saturating the material is changed. Asymptotic development of t...

journal_title：Ultrasonics

authors： Moussatov A,Ayrault C,Castagnède B

更新日期：2001-04-01 00:00:00

abstract：:The Total Focusing Method (TFM) yields a focused image in emission and in reception while Phased Array (PA) imaging provides Dynamic Depth Focusing (DDF) in reception only. Besides, most NDE applications have two propagation media, where refraction at the interface complicates time-of-flight (TOF) and focal law comput...

journal_title：Ultrasonics

authors： Cruza JF,Camacho J,Mateos R,Fritsch C

更新日期：2019-11-01 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：:In general, the design and analysis of ultrasonic motor and motor's control strategy are based on mathematical model. The academic model is widely used in the analysis of traveling wave ultrasonic motor (TWUSM). But the dispersive characteristic of piezoelectric ceramics and other complicated process, such as the fric...

journal_title：Ultrasonics

authors： Jingzhuo S,Dongmei Y

更新日期：2014-02-01 00:00:00

abstract：:The Mössbauer and X-rays analysis of as-received Fe-powder and Fe-powder mechanically alloyed with C using high power ultrasonics were carried out. The powder blend of Fe-powder and graphite was processed in He environment during 5 to 50 h. The dissolution of carbon in iron particles and inhomogeneous distribution of ...

journal_title：Ultrasonics

authors： Nadutov VM,Mordyuk BN,Prokopenko GI,Gavrilenko IS

更新日期：2004-04-01 00:00:00

abstract：:This paper deals with the influence of acousto-optic interactions on the displacement measurements performed over transducer array and their effects on the predicted diffraction field. Changes on the temporal/spatial responses and the plane wave decomposition of the displacement are discussed. Modifications made on th...

journal_title：Ultrasonics

authors： Certon D,Ferin G,Bou Matar O,Guyonvarch J,Remenieras JP,Patat F

更新日期：2004-04-01 00:00:00

abstract：MOTIVATION:Commercial ultrasound machines in the past did not provide the ultrasound researchers access to raw ultrasound data. Lack of this ability has impeded evaluation and clinical testing of novel ultrasound algorithms and applications. OBJECTIVES:Recently, we developed a flexible ultrasound back-end where all th...

journal_title：Ultrasonics

authors： Shamdasani V,Bae U,Sikdar S,Yoo YM,Karadayi K,Managuli R,Kim Y

更新日期：2008-07-01 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：:This will be a discussion of the non-invasive determination of the viscosity of a non-Newtonian fluid in laminar pipe flow over the range of shear rates present in the pipe. The procedure used requires knowledge of the flow profile in and the pressure drop along a long straight run of pipe. The profile is determined b...

journal_title：Ultrasonics

authors： Pfund DM,Greenwood MS,Bamberger JA,Pappas RA

更新日期：2006-12-22 00:00:00

abstract：PURPOSE:Human 8-oxoguanine DNA glycosylase (OGG1) is a major base excision repair enzyme, and it was reported to suppress the activation of intrinsic apoptotic signaling pathway in response to oxidative stress. In this study, our aim was to investigate the effects of OGG1 downregulation on ultrasound-induced apoptosis ...

journal_title：Ultrasonics

authors： Xu T,Nie Y,Bai J,Li L,Yang B,Zheng G,Zhang J,Yu J,Cheng X,Jiao J,Jing H

更新日期：2016-12-01 00:00:00

abstract：:The radial variations in the velocity of longitudinal waves propagating through Japanese cedar and Japanese cypress were experimentally investigated. In addition, the tracheid length (TL), microfibril angle (MFA), air-dried density (AD), and moisture content (MC) were measured in order to determine the effect of wood ...

journal_title：Ultrasonics

authors： Hasegawa M,Takata M,Matsumura J,Oda K

更新日期：2011-04-01 00:00:00

abstract：:We propose a method for evaluating the size of the laser-induced breakdown region in water based on the detection and analysis of optodynamic waves. The breakdown region is an optodynamic source of pressure waves that propagate into the surrounding liquid as an ultrasonic pulse. In the experiment the optical breakdown...

journal_title：Ultrasonics

authors： Petkovsek R,Horvat D,Mocnik G,Terzić M,Mozina J

更新日期：2006-12-22 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：:It is necessary to identify speckled regions in ultrasound images to control adaptive speckle suppression algorithms, for tissue characterisation, and to estimate the elevational separation of B-scans by speckle decorrelation. Previous authors have proposed classification techniques based on second order powers of the...

journal_title：Ultrasonics

authors： Prager RW,Gee AH,Treece GM,Berman LH

更新日期：2002-05-01 00:00:00

abstract：:Experimental results of ultrasound of varying frequency (0.8-5.0 MHz) propagating in cold drawn wires of stainless steel and aluminium ranging in diameter from 0.25 to 1.21 mm are in close agreement with theoretical predictions. This agreement is maintained when the coupling medium between the wire and the ultrasound ...

journal_title：Ultrasonics

authors： Nicholson NC,McDicken WN,Anderson T

更新日期：1989-03-01 00:00:00

abstract：:Most methods used to measure the thickness of thin liquid or solid surface films and coatings need access to the coated surface. In this work reflected ultrasonic pulses were used to measure a coating thickness from a solid back face. Piezoelectric transducers on the solid back face emitted ultrasound waves and receiv...

journal_title：Ultrasonics

authors： Kanja J,Mills R,Li X,Brunskill H,Hunter AK,Dwyer-Joyce RS

更新日期：2021-02-01 00:00:00

abstract：:Experimental and theoretical studies on degradation of composite-epoxy adhesive joints were carried out on samples having different interfacial and cohesive properties. Oblique incidence ultrasonic inspection of bonded joints revealed that degradation in the adhesive can be measured by significant variation in reflect...

journal_title：Ultrasonics

authors： Vijaya Kumar RL,Bhat MR,Murthy CR

更新日期：2013-08-01 00:00:00

abstract：:Our study aims at the creation of a numerical toolbox that describes wave propagation in samples containing internal contacts (e.g. cracks, delaminations, debondings, imperfect intergranular joints) of known geometry with postulated contact interaction laws including friction. The code consists of two entities: the co...

journal_title：Ultrasonics

authors： Delrue S,Aleshin V,Truyaert K,Bou Matar O,Van Den Abeele K

更新日期：2018-01-01 00:00:00

abstract：:This paper presents a study on the worsening caused by a random perturbation of the weighting window (modeling, in this way, the uncertainty on the channel sensitivity), or by an alteration of the shape of the transmitted pulse, for a wideband array. In the stability evaluation, main-lobe width and signal to noise rat...

journal_title：Ultrasonics

authors： Curletto S,Parodi C,Trucco A

更新日期：2004-04-01 00:00:00

abstract：:The dispersion and attenuation features of the multi-physical fields coupled waves propagating in an infinite piezoelectric semiconductor and the reflection problem at a boundary which is mechanically free, electrically insulation and the dielectrically open circuit are studied in this paper. Different from the classi...

journal_title：Ultrasonics

authors： Jiao F,Wei P,Zhou X,Zhou Y

更新日期：2019-02-01 00:00:00

abstract：:The properties of optical to acoustic transduction of semiconductor superlattices have been explored for several years in the sub terahertz frequency range. Using femtosecond laser pulses focused on these structures, acoustic modes are excited with a frequency related to the periodicity of the structure stacking. We h...

journal_title：Ultrasonics

authors： Huynh A,Perrin B,Lemaître A

更新日期：2015-02-01 00:00:00

abstract：:Influence of clustering of cavitation bubbles on multibubble sonoluminescence (MBSL) in standing wave fields is studied through measurement of MBSL intensity with a photomultiplier tube and observation of corresponding bubble behavior with a high-speed video camera and an intensified charge-coupled device one. It is c...

journal_title：Ultrasonics

authors： Hatanaka S,Yasui K,Kozuka T,Tuziuti T,Mitome H

更新日期：2002-05-01 00:00:00

abstract：:This paper is concerned with the probing of the transversal envelope solitons propagation in circular waveguides when a set of requirements (non-linearity and dispersion) are fulfilled in the waveguide and balanced. The basic idea is to analyze the shape of an acoustic pulse after it has traveled one or few trips thro...

journal_title：Ultrasonics

authors： de Billy M,Hladky-Hennion AC

更新日期：2014-07-01 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：:The correlation between ultrasonic wave propagation and polycrystalline microstructures has significant implications in nondestructive evaluation. An original numerical approach using the finite element method to quantify in both time and frequency domains the ultrasonic noise scattering due to the elastic heterogenei...

journal_title：Ultrasonics

authors： Bai X,Tie B,Schmitt JH,Aubry D

更新日期：2018-07-01 00:00:00