abstract：:The main challenge faced by 3D ultrasonic imaging with 2D array transducers is the large number of elements required to achieve an acceptable level of quality in the images. Therefore, the optimisation of the array layout, in order to reduce the number of active elements in the aperture, has been a research topic in t...

journal_title：Ultrasonics

authors： Martínez-Graullera O,Martín CJ,Godoy G,Ullate LG

更新日期：2010-02-01 00:00:00

abstract：:Sonoelectrochemistry is undergoing a reemerging activity in the last years with an increasing number of papers appearing in a wide range of peer review journals. Applied studies which cover environmental treatments, synthesis or characterization of nanostructures, polymeric materials synthesis, analytical procedures, ...

journal_title：Ultrasonics

authors： González-García J,Esclapez MD,Bonete P,Hernández YV,Garretón LG,Sáez V

更新日期：2010-02-01 00:00:00

abstract：:When casting ceramic items in potteries, liquid 'slip' is passed from a settling tank, through overhead pipelines, before being pumped manually into the moulds. It is not uncommon for bubbles to be introduced into the slip as it passes through the complex piping network, and indeed the presence of bubbles is a major s...

journal_title：Ultrasonics

authors： Yim GT,Leighton TG

更新日期：2010-01-01 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：:The method of wave function expansion is adopted to study the three dimensional scattering of a time-harmonic plane progressive sound field obliquely incident upon a multi-layered hollow cylinder with interlaminar bonding imperfection. For the generality of solution, each layer is assumed to be cylindrically orthotrop...

journal_title：Ultrasonics

authors： Rajabi M,Hasheminejad SM

更新日期：2009-12-01 00:00:00

abstract：:In the food industry, ultrasonic cutting is used to improve separation by a reduction of the cutting force. This reduction can be attributed to the modification of tool-workpiece interactions at the cutting edge and along the tool flanks because of the superposition of the cutting movement with ultrasonic vibration of...

journal_title：Ultrasonics

authors： Schneider Y,Zahn S,Schindler C,Rohm H

更新日期：2009-06-01 00:00:00

abstract：:The threshold filter is a frequently used technique in ultrasound B-scan to reject the small echoes contributed from backscattering that blur the tissue interface and reduce the image contrast. Note that using the threshold based on one value would simultaneously destroy local waveform features of the reflection echoe...

journal_title：Ultrasonics

authors： Tsui PH,Chang CC,Chang CC,Huang NE,Ho MC

更新日期：2009-05-01 00:00:00

abstract：:The ability to generate short focused ultrasonic pulses with duration on the order of one period of carrier frequency depends on the bandwidth of the transmitter as the pulse duration is inversely proportional to the bandwidth. Conventional focusing arrays used for focusing ultrasound have limited bandwidth due to the...

journal_title：Ultrasonics

authors： Sarvazyan A,Fillinger L

更新日期：2009-03-01 00:00:00

abstract：:Clinical ultrasound images are often perceived as difficult to interpret due to image blurring and speckle inherent in the ultrasound imaging. But the image quality can be improved by deconvolution using an estimate of the point-spread function. However, it is difficult to obtain a sufficiently accurate estimate of th...

journal_title：Ultrasonics

authors： Shin HC,Prager R,Ng J,Gomersall H,Kingsbury N,Treece G,Gee A

更新日期：2009-03-01 00:00:00

abstract：:Ultrasonic reflection and transmission measurements on saturated, plane-parallel, poroelastic slabs are presented. A data processing technique is proposed to obtain poroelastic parameters from transmission measurements. A special experimental data acquisition and processing technique is applied to minimize the finite ...

journal_title：Ultrasonics

authors： Jocker J,Smeulders D

更新日期：2009-03-01 00:00:00

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：:Surface acoustic wave (SAW) waveguide resonator is formed by a ring-shaped strip of copper 10 microm wide and approximately 130 microm in diameter embedded into a 0.8 microm thick layer of silica on a silicon wafer. SAWs are excited at one side of the copper ring by a short laser pulse focused into a spatially periodi...

journal_title：Ultrasonics

authors： Maznev AA

更新日期：2009-01-01 00:00:00

abstract：:Periodic composite ultrasonic transducers offer many advantages but the periodic pillar architecture can give rise to unwanted modes of vibration which interfere with the piston like motion of the fundamental thickness mode. In this paper, viscoelastic loss is incorporated into a three-dimensional plane wave expansion...

journal_title：Ultrasonics

authors： Orr LA,Mulholland AJ,O'Leary RL,Hayward G

更新日期：2008-12-01 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：:A laser-based technique for the contact-free generation and detection of strongly nonlinear surface acoustic wave (SAW) pulses with amplitudes limited by the materials strength has been developed. The effects of nonlinear propagation of short elastic surface pulses with finite strength in isotropic solids, such as fus...

journal_title：Ultrasonics

authors： Lomonosov AM,Hess P

更新日期：2008-11-01 00:00:00

abstract：:A numerical study is presented to show the potential for using vibroacoustic-based experiments to identify elastic material properties of orthotropic cylindrical vessels immersed in fluids. Sensitivity analyses and a simulated inverse problem are shown to quantify the potential for material characterization through th...

journal_title：Ultrasonics

authors： Rosario DE,Brigham JC,Aquino W

更新日期：2008-11-01 00:00:00

abstract：:The therapeutic benefits of several existing ultrasound-based therapies such as facilitated drug delivery, tumor ablation and thrombolysis derive largely from physical or mechanical effects. In contrast, ultrasound can also trigger various time-dependent biochemical responses in the exposed biological milieu. Several ...

journal_title：Ultrasonics

authors： Paliwal S,Mitragotri S

更新日期：2008-08-01 00:00:00

abstract：:The aim of this work is to investigate the absolute phase information in resonance acoustic scattering by spheres and cylinders and place this work in the broader context of scattering in which the properties of the magnitude and (processed) phase have been examined in a more general way than in the classical resonanc...

journal_title：Ultrasonics

authors： Mitri FG,Greenleaf JF,Fellah ZE,Fatemi M

更新日期：2008-07-01 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：OBJECTIVES:This paper aims to apply median filters for reducing interpolation error and improving the quality of 3D images in a freehand 3D ultrasound (US) system. BACKGROUND AND MOTIVATION:Freehand 3D US imaging has been playing an important role in obtaining the entire 3D impression of tissues and organs. Reconstruc...

journal_title：Ultrasonics

authors： Huang QH,Zheng YP

更新日期：2008-07-01 00:00:00

abstract：:Several experimental studies have demonstrated that ultrasound (US) can accelerate enzymatic fibrinolysis and this effect is further enhanced in the presence of ultrasound contrast agents (UCA). Although UCA have been shown to be safe when administered to ischemic stroke patients, safety information of these agents in...

journal_title：Ultrasonics

authors： Soltani A,Prokop AF,Vaezy S

更新日期：2008-04-01 00:00:00

abstract：:Lithium niobate, LiNbO(3), is a piezoelectric material well known for its high Curie temperature. However, it has often been neglected for use in ultrasonic transducers because of its low electro-mechanical coupling coefficients. Recent advances in signal processing have made this disadvantage less significant and we ...

journal_title：Ultrasonics

authors： Schmarje N,Kirk KJ,Cochran S

更新日期：2007-12-01 00:00:00

abstract：:The design of a novel, single-axis ultrasonic actuating stage has been proposed. It consists of a movable plate, an edge-driving ultrasonic actuator as an actuating device, and a magnetic Magi encoder as a position sensor. The stage is impelled using a friction-contact mechanism by the ultrasonic actuator with long di...

journal_title：Ultrasonics

authors： Wen F,Yen CY

更新日期：2007-12-01 00:00:00

abstract：:This paper describes ultrasonic measurements of normal and tangential stiffnesses of the contacting interface between polished aluminum blocks subjected to nominal contact pressures up to about 3.8 MPa. These stiffnesses were evaluated by ultrasonic spectroscopy methods for the bulk (longitudinal and transverse) wave ...

journal_title：Ultrasonics

authors： Biwa S,Hiraiwa S,Matsumoto E

更新日期：2007-12-01 00:00:00

abstract：:This paper investigates the use of magnetically active materials in the matching layer of a piezoelectric transducer. This then allows the performance of the device to be dynamically altered by applying an external field. The effect that this new matching layer has on the performance of a typical device is theoretical...

journal_title：Ultrasonics

authors： Mulholland AJ,O'Leary RL,Ramadas N,Parr A,Troge A,Pethrick RA,Hayward G

更新日期：2007-12-01 00:00:00

abstract：:To increase the sensitivity of Lamb waves to hidden corrosion in aircraft structures, a preliminary step is to understand the phenomena governing this interaction. A hybrid model combining a finite element approach and a modal decomposition method is used to investigate the interaction of Lamb modes with corrosion pit...

journal_title：Ultrasonics

authors： Terrien N,Royer D,Lepoutre F,Déom A

更新日期：2007-06-01 00:00:00

abstract：:The study is aimed to perform dynamic modeling of a part feeder powered by piezoelectric actuation. This part feeder consists mainly of a horizontal platform vibrated by a pair of parallel piezoelectric bimorph beams. Owing to intermittent impacts with the platform, the transported part on the platform is able to marc...

journal_title：Ultrasonics

authors： Chao PC,Shen CY

更新日期：2007-06-01 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 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：:Ultrasound (US) has been used in IMS II (intravascular US) and CLOTBUST (transcranial US) clinical trials for thrombolysis. During the treatment, in addition to the targeted thrombus, other biological components, such as blood and vessel walls are subjected to long durations of US exposure. In this study we explored e...

journal_title：Ultrasonics

authors： Soltani A,Singhal R,Garcia JL,Raju NR

更新日期：2007-03-01 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：:Predominant physical phenomenon in highly scattering materials is the attenuation due to dispersion. Therefore, received echo has high frequencies more severely attenuated than low frequencies and the structural noise can be modeled as a non-stationary random process. Most of the proposed techniques for enhancing the ...

journal_title：Ultrasonics

authors： Izquierdo MA,Hernández MG,Anaya JJ

更新日期：2006-12-22 00:00:00

abstract：:Transducer is the necessary and most important part in the maxonics. New applications demand for new transducer, and the renovation of the transducer will open a new field for the application of the maxonics. The important method to develop new transducer is to find and develop new material. The rare earth giant magne...

journal_title：Ultrasonics

authors： Liu W,Zhou L,Xia T,Yu H

更新日期：2006-12-22 00:00:00

abstract：:This paper presents recent improvement on sound velocity measurements under extreme conditions, illustrated by the hypersonic sound velocity measurements of water up to 723 K and 9 GPa using Brillouin scattering technique. Because water at high pressure and high temperature is chemically very aggressive, these experim...

journal_title：Ultrasonics

authors： Decremps F,Datchi F,Polian A

更新日期：2006-12-22 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：:Classically, rotary motors with gears and spindle mechanisms are used to achieve translatory motion. In means of miniaturization and weight reduction piezoelectric linear motors are of interest. Several ultrasonic linear motors found in literature base on the use of two different vibration modes. Most often flexural a...

journal_title：Ultrasonics

authors： Hemsel T,Mracek M,Twiefel J,Vasiljev P

更新日期：2006-12-22 00:00:00

abstract：:Today, sophisticated instruments and algorithms used for process control allow the efficient production of substances with the quality guaranteed to the customer. However, production and management techniques are changing. This article aims to analyze trends resulting from those changes from the point of view of ultra...

journal_title：Ultrasonics

authors： Püttmer A

更新日期：2006-12-22 00:00:00

abstract：:The estimation of clamping force has been regarded as the main issue in the maintenance of high-tension bolts. This paper proposes a method which uses the dependency of ultrasonic velocity on stress based on the nonlinear elastic effect. The variation of ultrasonic velocity in the range of actual stress acting in the ...

journal_title：Ultrasonics

authors： Jhang KY,Quan HH,Ha J,Kim NY

更新日期：2006-12-22 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：: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