Characterization of air-coupled ultrasound transducers in the frequency range 40 kHz-2 mHz using light diffraction tomography.

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

abstract：:The film condensation of vapor on a cooled, downward-facing surface is a complex dynamic fluid phenomenon. This paper will describe the theoretical basis, instrumentation approach, and experimental results for a method for ultrasonic monitoring of film condensation. The ultrasound measurement system utilizes a 10 MHz ...

journal_title：Ultrasonics

authors： Pedersen PC,Cakareski Z,Hermanson JC

更新日期：2000-03-01 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：: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：:Thrombosis is an extremely critical clinical condition where a clot forms inside a blood vessel which blocks the blood flow through the cardiovascular system. Previous sonothrombolysis methods using ultrasound and microbubbles (MBs) often have a relatively low lysis rate due to the low microbubbles concentration at cl...

journal_title：Ultrasonics

authors： Zhang B,Kim H,Wu H,Gao Y,Jiang X

更新日期：2019-09-01 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：: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：:In this newly developed method, the ultrasonic diagnosis has become quantitative. The data will remain quantitative so far as an image storage tube is used. With the conventional storage type CRT, it is impossible to memorize the reflected echo signals of different strength levels. But with our method, it becomes poss...

journal_title：Ultrasonics

authors： Yokoi H,Tatsumi T,Ito K

更新日期：1975-09-01 00:00:00

abstract：:An influence of ultrasonic treatment (drawing) on structure, high temperature durability, evaporation and creep behaviours of tungsten single crystal and wires were investigated. A relation of tungsten wires properties with dislocation distribution was determined. ...

journal_title：Ultrasonics

authors： Mordyuk BN,Mordyuk VS,Buryak VV

更新日期：2004-04-01 00:00:00

abstract：:Machining temperature is a key factor in ultrasonic vibration-assisted milling as it can significantly influence tool wear rate and residual thermal stresses. In current study, a physics-based analytical predictive model on machining temperature in ultrasonic vibration-assisted milling is proposed, without resorting t...

journal_title：Ultrasonics

authors： Feng Y,Hsu FC,Lu YT,Lin YF,Lin CT,Lin CF,Lu YC,Liang SY

更新日期：2020-12-01 00:00:00

abstract：:The purpose of this study is to gain the knowledge and experience in the design of thin-disk piezoceramic-driving ultrasonic actuator dedicated. In this paper, the design and construction of an innovative ultrasonic actuator is developed as a stator, which is a composite structure consisting of piezoceramic (PZT) memb...

journal_title：Ultrasonics

authors： Wen FL,Yen CY,Ouyang M

更新日期：2003-08-01 00:00:00

abstract：:The present paper studies experimentally and numerically the surface acoustic wave (SAW) field on a piezoelectric substrate generated by interdigital transducers (IDT). On the one hand, mechanical displacements produced by the SAW are measured with the help of a laser Doppler vibrometer. On the other hand, mechanical ...

journal_title：Ultrasonics

authors： Weser R,Darinskii AN,Weihnacht M,Schmidt H

更新日期：2020-08-01 00:00:00

abstract：:The digital ultrasonic fixed path interferometer designed for testing small amounts of sample was used for the investigation of whole blood coagulation, retraction and clot melting processes. The ultrasound velocity and absorption are determined from the characteristics of an acoustic resonator consisting of an emitte...

journal_title：Ultrasonics

authors： Grybauskas P,Kundrotas K,Sukackas V,Yaronis E

更新日期：1978-01-01 00:00:00

abstract：:Arterial stiffness has been shown to be a good indicator of arterial wall disease. However, a single parameter is insufficient to describe the complex stress-strain relationship of a multi-component, non-linear tissue such as the aorta. We therefore propose a new approach to measure the stress-strain relationship loca...

journal_title：Ultrasonics

authors： Danpinid A,Luo J,Vappou J,Terdtoon P,Konofagou EE

更新日期：2010-06-01 00:00:00

abstract：:Chemical mechanical polishing (CMP) is the primary method to realize the global planarization of silicon wafer. In order to improve this process, a novel method which combined megasonic vibration to assist chemical mechanical polishing (MA-CMP) is developed in this paper. A matching layer structure of polishing head w...

journal_title：Ultrasonics

authors： Zhai K,He Q,Li L,Ren Y

更新日期：2017-09-01 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：: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：: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：: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：: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：: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：: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：: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：:The acoustic source localization technique for anisotropic plates proposed by the authors in an earlier publication ([1] Kundu et al., 2012) is improved in this paper by adopting some modifications. The improvements are experimentally verified on anisotropic flat and curved composite plates. Difficulties associated wi...

journal_title：Ultrasonics

authors： Nakatani H,Kundu T,Takeda N

更新日期：2014-09-01 00:00:00

abstract：:Both pinnae of anaesthetized male guinea-pigs were contused in a reproducible manner and one immediately treated with 0.75 MHz ultrasound at an average therapeutic intensity of 0.61 W cm-2 for a period of 2 min. The lividity and rate of resorption of the rusultant bruises were measured by a photometric method. The res...

journal_title：Ultrasonics

authors： Hustler JE,Zarod AP,Williams AR

更新日期：1978-09-01 00:00:00

abstract：:Estimation of the attenuation is important in medical ultrasound not only for correct time-gain compensation but also for tissue characterization. In this paper, the feasibility of a new method for attenuation estimation is tested. The proposed method estimates the attenuation by repeatedly solving the forward wave pr...

journal_title：Ultrasonics

authors： Ilyina N,Hermans J,Verboven E,Van Den Abeele K,D'Agostino E,D'hooge J

更新日期：2018-03-01 00:00:00

abstract：:Local Defect Resonance (LDR) is exploited for non-destructive testing (NDT) by using ultrasonic vibrations to get a localized resonant activation of defected zones. The LDR technique relies on the local stiffness difference between the defect and the sound material. Analyzing the structure's displacement field at this...

journal_title：Ultrasonics

authors： Segers J,Hedayatrasa S,Poelman G,Van Paepegem W,Kersemans M

更新日期：2020-07-01 00:00:00

abstract：:This paper presents a method which combines electromagnetic simulation and ultrasonic simulation to build EMAT array models. For a specific sensor configuration, Lorentz forces are calculated using the finite element method (FEM), which then can feed through to ultrasonic simulations. The propagation of ultrasound wav...

journal_title：Ultrasonics

authors： Xie Y,Yin W,Liu Z,Peyton A

更新日期：2016-03-01 00:00:00

abstract：:Measurements of elastic constants of the austenite phase when approaching the phase transformation either upon cooling or stressing is of the crucial interest for the shape memory alloy field. Acoustic properties (wave velocity and also attenuation changes) of the Cu-Al-Ni single crystal were investigated in situ duri...

journal_title：Ultrasonics

authors： Landa M,Novák V,Sedlák P,Sittner P

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