An improved approximation for the Rayleigh wave equation.

abstract：:Discovery and evaluation concerns of barely visible impact damage in composite materials is a well-known issue in industries using these materials. This work proposes a frequency sweep method where damage assessment is conducted with respect to the time domain. Firstly, a combined linear and nonlinear ultrasound imagi...

journal_title：Ultrasonics

authors： Malfense Fierro GP,Meo M

更新日期：2019-03-01 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 wave propagation of an infinite functionally graded plate in thermal environments is studied using the higher-order shear deformation plate theory. The thermal effects and temperature-dependent material properties are both taken into account. The temperature field considered is assumed to be a uniform distribution...

journal_title：Ultrasonics

authors： Sun D,Luo SN

更新日期：2011-12-01 00:00:00

abstract：:It is shown that a diffuse field is not devoid of phase information, but has a correlation function equal to the Green's function. More specifically, the cross-correlation between diffuse signals in two transducers is very nearly equal to the direct response of one transducer to an impulse applied to the other. This i...

journal_title：Ultrasonics

authors： Weaver R,Lobkis O

更新日期：2002-05-01 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：:One of the fundamental theorems in (optical, acoustical, quantum, gravitational) wave scattering is the optical theorem for plane waves, which relates the extinction cross-section to the forward scattering complex amplitude function. In this analysis, the optical theorem is extended for the case of 3D-beams of arbitra...

journal_title：Ultrasonics

authors： Mitri FG

更新日期：2016-04-01 00:00:00

abstract：:Guided modes propagation in intact, fractured and healing long bone has drawn significant research interests. However, mode quantifications for the direct comparison are still necessary to address. The aim of the study is to analyze the mode interaction with a notch-fracture in the long bone and find quantitative ultr...

journal_title：Ultrasonics

authors： Xu K,Liu D,Ta D,Hu B,Wang W

更新日期：2014-07-01 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：:The location of continuous acoustic emission sources is a difficult problem of non-destructive testing. This article describes one-dimensional location of continuous acoustic emission sources by using an intelligent locator. The intelligent locator solves a location problem based on learning from examples. To verify w...

journal_title：Ultrasonics

authors： Kosel T,Grabec I I,Muzic P

更新日期：2000-03-01 00:00:00

abstract：:The natural frequencies and distributions of displacement components for the surface vibrational modes in thin isotropic elastic disks are calculated. In particular, the research is focused on even solutions for low-lying resonant vibrations with large angular wave numbers. Several families of modes are found which ar...

journal_title：Ultrasonics

authors： Dmitriev AV,Gritsenko DS,Mitrofanov VP

更新日期：2014-03-01 00:00:00

abstract：:An experimental ultrasonic sonar for use as a sensory aid with blind children is described. Novel signal processing techniques make the aid relatively simple to construct, yet allow many of its parameters to be changed in the field. In particular, the aid has two features, a variable range code and an automatic level...

journal_title：Ultrasonics

authors： Boys JT,Strelow ER,Clark GR

更新日期：1979-01-01 00:00:00

abstract：:This study aims to bridge the gap between transport mechanisms of an improved ultrasound contrast agent (UCA) and its resulting behavior in a clinical imaging study. Phospholipid-shelled microbubbles nested within the aqueous core of a polymer microcapsule are examined for their use and feasibility as an improved UCA....

journal_title：Ultrasonics

authors： Wallace N,Dicker S,Lewin P,Wrenn SP

更新日期：2014-12-01 00:00:00

abstract：:Use of in-fiber Fabry-Perot (FP) filters based on fiber Bragg gratings as both sensor as well as an interrogator for enhancing the detection limit of elastic wave sensing is investigated in this paper. The sensitivity of such a demodulation scheme depends on the spectral discrimination of the sensor and interrogator g...

journal_title：Ultrasonics

authors： Harish AV,Varghese B,Rao B,Balasubramaniam K,Srinivasan B

更新日期：2015-07-01 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：:Shear-Horizontally (SH) polarized, ultrasonic, guided wave modes are considered in order to infer changes in the adhesive properties at several interfaces located within an adhesive bond joining two metallic plates. Specific aluminium lap-joint samples were produced, with different adhesive properties at up to four in...

journal_title：Ultrasonics

authors： Castaings M

更新日期：2014-09-01 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：:This paper deals with the influence of gas law on ultrasonic behaviour of porous media when the saturating fluid is high pressured. Previous works have demonstrated that ultrasonic transmission through a porous sample with variations of the static pressure (up to 18 bars) of the saturating fluid allows the characteriz...

journal_title：Ultrasonics

authors： Griffiths S,Ayrault C

更新日期：2010-06-01 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：: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：: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：: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：: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 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：: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：:The goal standard of contrast echocardiography is the absolute measure of myocardial perfusion using a contrast agent. Actually, several contrast agents are developed. All these agents show left ventricular opacification after intravenous injection. However, none of these agents shows an acceptable enhancement of the ...

journal_title：Ultrasonics

authors： Bouakaz A,de Jong N,Cachard C,Jouini K

更新日期：1998-02-01 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：: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：:A noble method for continuous leakage source location with one sensor in gas-filled pipe and noisy environment is proposed based on wavelet analysis and modal location theory. The leakage signals were analyzed into high and low frequencies by wavelet decomposition and noises and reflected waves were omitted. Then the ...

journal_title：Ultrasonics

authors： Mostafapour A,Davoodi S

更新日期：2015-09-01 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