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：:This paper deals with 2-D simulation of finite-amplitude standing waves behavior in rectangular acoustic resonators. Set of three partial differential equations in third approximation formulated in conservative form is derived from fundamental equations of gas dynamics. These equations form a closed set for two compon...

journal_title：Ultrasonics

authors： Cervenka M,Bednarik M

更新日期：2006-12-22 00:00:00

abstract：:In order to guide the needle to the correct location in 3D US-guided brachytherapy, the needle is continuously tracked as it is being inserted. A pre-scan before the needle insertion and a post-scan after the needle insertion are subtracted to obtain a difference image containing the needle. The image is projected alo...

journal_title：Ultrasonics

authors： Ding M,Wei Z,Gardi L,Downey DB,Fenster A

更新日期：2006-12-22 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：:In this paper, an experimental study of the effect of the resonator shape on the performance of a traveling-wave thermoacoustic engine is presented. Two different resonators were tested in the thermoacoustic-Stirling heat. One resonator is an iso-diameter one, and the other is a tapered one. To have a reasonable compa...

journal_title：Ultrasonics

authors： Luo EC,Ling H,Dai W,Yu GY

更新日期：2006-12-22 00:00:00

abstract：:An improved method for ultrasonic location of multiple flaws using perpendicular ultrasonic arrays, working in near-field conditions, is presented. The method uses the pulse-echo technique and is based on the processing of the information acquired by both the elemental emitting transducers and their adjacent ones. Thi...

journal_title：Ultrasonics

authors： Rodríguez MA,Ramos A,San Emeterio JL

更新日期：2006-12-22 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 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：: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：:This article proposes to estimate slow blood flow with high frequency ultrasound imaging. The proposed technique combines 2 methods. First, a statistical method, called Speckle Flow Imaging (SFI) based on the analysis of changes in the speckle pattern along time, gives an index directly related to the total velocity v...

journal_title：Ultrasonics

authors： Aoudi W,Liebgott H,Needles A,Yang V,Foster FS,Vray D

更新日期：2006-12-22 00:00:00

abstract：:Over the last two decades, more efficient transducers were developed for the generation and reception of air-borne ultrasound, thus enabling the non-contact, non-contaminating inspection of composite laminates and honeycomb structures widely used in the aerospace industry. This paper presents the fundamentals of makin...

journal_title：Ultrasonics

authors： Hsu DK

更新日期：2006-12-22 00:00:00

abstract：:Molecular techniques are transforming our understanding of cellular function and disease. However, accurate molecular analysis methods will be limited if the input DNA, RNA, or protein is not derived from pure population of cells or is contaminated by the wrong cells. A novel Ultrasonic Vibration Micro-dissection (UVM...

journal_title：Ultrasonics

authors： Sun L,Wang H,Chen L,Liu Y

更新日期：2006-12-22 00:00:00

abstract：:Ultrasonic studies of the group of halogens of benzene and particularly dependence of acoustic parameters on the structure of organic liquids, demonstrate some interesting regularities in the group of these compounds in gas and liquid states. In this paper results for five cyclic liquids: bromo-, chloro-, fluoro- and ...

journal_title：Ultrasonics

authors： Linde BB,Lezhnev NB

更新日期：2006-12-22 00:00:00

abstract：:The main component of every device used for investigating internal object structure by Ultrasound Transmission Tomography (UTT) is a special ultrasonic probe. This paper presents the structure of model multielement ring probe for examining objects using this method in divergent ray projection geometry. The probe is ma...

journal_title：Ultrasonics

authors： Gudra T,Opielinski KJ

更新日期：2006-12-22 00:00:00

abstract：:In this paper, high-speed photography was used to investigate the intrinsic dynamics of subharmonious surface wave in a vertical vibrated and idealized bidimensional granular layer. Using the high-speed photography, velocity fields of the granular layer at different stages through two cycles were obtained, which show ...

journal_title：Ultrasonics

authors： Zhang P,Huang K,Miao G,Wei R

更新日期：2006-12-22 00:00:00

abstract：:Ultrasonic cutting is widely used in food processing applications to produce a clean and accurate cut. However, it is yet to be adopted as an instrument of choice in orthopaedic applications, mainly due to the high temperatures that can be generated at the cut site and the consequent requirement to use additional cool...

journal_title：Ultrasonics

authors： Cardoni A,MacBeath A,Lucas M

更新日期：2006-12-22 00:00:00

abstract：:It is now accepted that an effective way to investigate the elastic properties of soft tissues is to generate a localized transient acoustic radiation force and to follow the associated displacements in the time/space domain. Shear waves induced by this stress field are particularly interesting in this kind of medium ...

journal_title：Ultrasonics

authors： Elkateb Hachemi M,Callé S,Remenieras JP

更新日期：2006-12-22 00:00:00

abstract：:Nitric oxide (NO) has been implicated in smooth muscle relaxation. Its use has been widespread in cardiology. Due to the effective scavenging of NO by hemoglobin, however, the drug has to be applied locally or in large quantities, to have the effect desired. We propose the use of encapsulated microbubbles that act as ...

journal_title：Ultrasonics

authors： Postema M,Bouakaz A,ten Cate FJ,Schmitz G,de Jong N,van Wamel A

更新日期：2006-12-22 00:00:00

abstract：:A practical optodynamic study was performed to determine the usability of different lengths of laser pulses for the generation of ultrasonic transients in a solid material. The aim of the study was to evaluate the possibility of a dual use for a laser pulse-for laser material processing, on the one hand, and for the u...

journal_title：Ultrasonics

authors： Hrovatin R,Petkovsek R,Diaci J,Mozina J

更新日期：2006-12-22 00:00:00

abstract：:Increased stiffness of the arteries has recently gained acceptance as a potential risk for cardiovascular and many other diseases. Pulse wave velocity (PWV) is widely used for estimating the stiffness of an artery. However, PWV is an indicator of average artery stiffness between two measuring points. In addition to me...

journal_title：Ultrasonics

authors： Zhang X,Greenleaf JF

更新日期：2006-12-22 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：: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：:An eight-channel ultrasonic detecting device for microbiological quality evaluation of packed liquid foods is presented in this paper. This device makes possible a non-invasive detection of the microbial growth in liquid foods with no need to open the carton-based packages where they are contained. Thermal and humidit...

journal_title：Ultrasonics

authors： Elvira L,Sampedro L,Montero de Espinosa F,Matesanz J,Gómez-Ullate Y,Resa P,Echevarría FJ,Iglesias JR

更新日期：2006-12-01 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：: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：: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 perform a multiscale analysis of the backscattering properties of a complex interface between water and a layer of randomly arranged glass beads with diameter D=1 mm. An acoustical experiment is done to record the wavelet response of the interface in a large frequency range from lambda/D=0.3 to lambda/D=15. The wav...

journal_title：Ultrasonics

authors： Le Gonidec Y,Gibert D

更新日期：2006-11-01 00:00:00

abstract：:This study considers the acoustic streaming in water produced by a lithotripsy pulse. Particle image velocimetry (PIV) method was employed to visualize the acoustic streaming produced by an electromagnetic shock wave generator using video images of the light scattering particles suspended in water. Visualized streamin...

journal_title：Ultrasonics

authors： Choi MJ,Doh DH,Hwang TG,Cho CH,Paeng DG,Rim GH,Coleman AJ

更新日期：2006-02-01 00:00:00

abstract：:The propagation of non-axisymmetric guided waves in larger diameter pipes is studied in this paper by treating the guided waves as corresponding Lamb waves in an unwrapped plate. This approximation leads to a simpler method for calculating the phase velocities of hollow cylinder guided waves, which reveals a beam focu...

journal_title：Ultrasonics

authors： Li J,Rose JL

更新日期：2006-01-01 00:00:00

abstract：:In this paper the behaviour of strongly nonlinear waves in axisymmetric resonators is experimentally and numerically studied. Experiments are carried out in a cylindrical cavity, which transversal dimension is bigger than the longitudinal one, excited by a narrow band transducer. The quality factor and displacement am...

journal_title：Ultrasonics

authors： Vanhille C,Campos-Pozuelo C

更新日期：2005-08-01 00:00:00

abstract：:Non-linear acoustic oscillations of gas bubbles immersed in viscoelastic fluids are theoretically studied. The problem is formulated by considering a constitutive equation of differential type with an interpolated time derivative. With the aid of this rheological model, fluid elasticity, shear thinning viscosity and e...

journal_title：Ultrasonics

authors： Jiménez-Fernández J,Crespo A

更新日期：2005-08-01 00:00:00

abstract：:The Lamb waves are used for the ultrasonic characterization of welds because of their relative long-range propagation. In this paper, a simplified model of a weld-strip between two identical semi-infinite elastic layers is investigated. The reflected and transmitted ultrasonic fields are expressed by modal series whos...

journal_title：Ultrasonics

authors： Predoi MV,Rousseau M

更新日期：2005-06-01 00:00:00

abstract：:We report on the 3-D modelling of periodic arrays of capacitive micromachined ultrasonic transducers (cMUTs) operating in fluid. Specific developments have been performed to model biperiodic transducer arrays and to take into account radiation into any stratified media at the front-side as well as the back-side of the...

journal_title：Ultrasonics

authors： Wilm M,Reinhardt A,Laude V,Armati R,Daniau W,Ballandras S

更新日期：2005-05-01 00:00:00

abstract：:Cones and wedges inserted between an ultrasonic transducer and the specimen provide the transducer (circular or rectangular shape) with enhanced capability for point or line contact with the specimen. Such an arrangement is useful in that the transducer can be used for transmitting to and receiving from a point (or li...

journal_title：Ultrasonics

authors： Rus G,Wooh SC,Gallego R

更新日期：2005-03-01 00:00:00

abstract：:Although, high resolution, real-time ultrasonic (US) imaging is routinely available, image interpretation is based on grey-level and texture and quantitative evaluation is limited. Other potentially useful diagnostic information from US echoes may include modifications in tissue acoustic parameters (speed, attenuation...

journal_title：Ultrasonics

authors： Meziri M,Pereira WC,Abdelwahab A,Degott C,Laugier P

更新日期：2005-03-01 00:00:00

abstract：:The present study focuses on a possibility for improving NO removal efficiency from flue gas by application of powerful sound waves. The sound waves (frequency 6.9-17.2kHz, intensity 144-160dB) are propagated from Hartmann sound generators to a preheated graphite disk inside a vertical reaction tube (height 1.8m, I.D....

journal_title：Ultrasonics

authors： Komarov SV,Nemeth S,Hirasawa M

更新日期：2005-02-01 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 purpose of this study was to investigate practical, safe, easy-to-use, non-cytotoxic, and reliable parameters to apply to an ultrasound (US) naked gene therapy system. The ultrasound pressure at the point of cell exposure was measured using a calibrated hydrophone and the intensity calculated. An acoustic power me...

journal_title：Ultrasonics

authors： Wei W,Zhengzhong B,Yongjie W,Lafeng Y,Yalin M

更新日期：2004-12-01 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：:Ultrasonic modes guided along the surface of a concrete block covered by a composite plate are investigated. First of all, the propagation phenomenon is studied by predicting the dispersion curves for various modes supposed to exist in this structure. Then, focus is made on a specific mode expected to be sensitive to ...

journal_title：Ultrasonics

authors： Castaings M,Hosten B,François D

更新日期：2004-04-01 00:00:00