abstract：:A nonlinear acoustic method to assess the damage level of a complex medium is discussed herein. Thanks to the highly nonlinear elastic signatures of cracks or, more generally, internal solid contacts, this method is able to distinguish between contributions from linear wave scattering by a heterogeneity and contributi...

journal_title：Ultrasonics

authors： Zhang Y,Tournat V,Abraham O,Durand O,Letourneur S,Le Duff A,Lascoup B

更新日期：2017-01-01 00:00:00

abstract：:Laser ultrasonic is a most promising method for non-destructive evaluation of residual stress. The residual stress of thin steel plate is measured by laser ultrasonic technique. The pre-stress loading device is designed which can easily realize the condition of the specimen being laser ultrasonic tested at the same ti...

journal_title：Ultrasonics

authors： Zhan Y,Liu C,Kong X,Lin Z

更新日期：2017-01-01 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：OBJECTIVES:The aim of the present study is to investigate the effects of sonodynamic action of hypocrellin B on human breast cancer cells and further explore its underlying mechanisms. METHODS:The cell viability of breast cancer MDA-MB-231 cells was examined by 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyl tetrazolium b...

journal_title：Ultrasonics

authors： Jia Y,Wang X,Liu Q,Leung AW,Wang P,Xu C

更新日期：2017-01-01 00:00:00

abstract：:This paper presents a novel linear piezoelectric motor which is suitable for rapid ultra-precision positioning. The finite element analysis (FEA) was applied for optimal design and further analysis, then experiments were conducted to investigate its performance. By changing the input signal, the proposed motor was fou...

journal_title：Ultrasonics

authors： Zhu C,Chu X,Yuan S,Zhong Z,Zhao Y,Gao S

更新日期：2016-12-01 00:00:00

abstract：:The purpose of this study is to evaluate whether a 5-repetition liver stiffness (LS) measurement as the standard protocol of shear wave elastography (SWE) is comparable to a conventional 10-repetition measurement protocol and to identify factors that influence the reliability of the 5-repetition protocol. A total of 3...

journal_title：Ultrasonics

authors： Choi SH,Jeong WK,Kim Y,Lim S,Kwon JW,Kim TY,Kim MY,Sohn JH

更新日期：2016-12-01 00:00:00

abstract：BACKGROUND:Generalized coherence factor (GCF) can be adaptively estimated from channel data to suppress sidelobe artifacts. Conventionally, Fast Fourier Transform (FFT) is utilized to calculate the full channel spectrum and suffers from high computation load. In this work, autocorrelation (AR)-based algorithm is utiliz...

journal_title：Ultrasonics

authors： Shen CC,Xing YQ,Jeng G

更新日期：2016-12-01 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：:A coordinated theoretical, numerical and experimental study is carried out in an effort to interpret the characteristics of propagating guided Lamb wave modes in presence of a high-density (HD) core region in a honeycomb composite sandwich structure (HCSS). Initially, a two-dimensional (2D) semi-analytical model based...

journal_title：Ultrasonics

authors： Sikdar S,Banerjee S

更新日期：2016-09-01 00:00:00

abstract：:In this work, the existence of the optimal working frequency for ultrasonic motors (USMs) is theoretically and experimentally verified for the first time, at which working point the power dissipation of the motors arrives at its minimum value. The mathematical model of the mechanical quality factor is initially deduce...

journal_title：Ultrasonics

authors： Shi W,Zhao H,Ma J,Yao Y

更新日期：2016-08-01 00:00:00

abstract：:Cavitation plays important roles in almost all high-intensity focused ultrasound (HIFU) applications. However, current two-dimensional (2D) cavitation mapping could only provide cavitation activity in one plane. This study proposed a three-dimensional (3D) ultrasound plane-by-plane active cavitation mapping (3D-UPACM)...

journal_title：Ultrasonics

authors： Ding T,Hu H,Bai C,Guo S,Yang M,Wang S,Wan M

更新日期：2016-07-01 00:00:00

abstract：:The local evaluation of several parameters of a crack is realized with a nonlinear laser ultrasonic method. The method is based on the sample excitation by two laser beams, independently intensity modulated at two cyclic frequencies ωH and ωL (ωH≫ωL) and on the detection of nonlinear frequency-mixing ultrasonic compon...

journal_title：Ultrasonics

authors： Mezil S,Chigarev N,Tournat V,Gusev V

更新日期：2016-07-01 00:00:00

abstract：:Investigation was carried out to study the effects of maximum aggregate size (MAS) (12.5mm, 19.0mm, 25.0mm, 37.5mm, and 50.0mm) on ultrasonic pulse velocity (UPV) of concrete. For investigation, first class bricks were collected and broken to make coarse aggregate. The aggregates were tested for specific gravity, abso...

journal_title：Ultrasonics

authors： Mohammed TU,Mahmood AH

更新日期：2016-07-01 00:00:00

abstract：:A method for measuring the mechanical quality factor (Q factor) of materials in large-amplitude flexural vibrations was devised on the basis of the original definition of the Q factor. The Q factor, the ratio of the reactive energy to the dissipated energy, was calculated from the vibration velocity distribution. The ...

journal_title：Ultrasonics

authors： Wu J,Mizuno Y,Tabaru M,Nakamura K

更新日期：2016-07-01 00:00:00

abstract：:The present study investigated the accuracy of micro-scale finite element modeling for simulating broadband ultrasound propagation in water-saturated trabecular bone-mimicking phantoms. To this end, five commercially manufactured aluminum foam samples as trabecular bone-mimicking phantoms were utilized for ultrasonic ...

journal_title：Ultrasonics

authors： Vafaeian B,Le LH,Tran TN,El-Rich M,El-Bialy T,Adeeb S

更新日期：2016-05-01 00:00:00

abstract：:This paper presents an original experimental and numerical investigation of acoustic streaming driven by an acoustic beam reflecting on a wall. The water experiment features a 2 MHz acoustic beam totally reflecting on one of the tank glass walls. The velocity field in the plane containing the incident and reflected be...

journal_title：Ultrasonics

authors： Moudjed B,Botton V,Henry D,Millet S,Ben Hadid H

更新日期：2016-05-01 00:00:00

abstract：:The importance of the analysis of the radiofrequency signal is by now recognized in the field of tissue characterization via ultrasound. The RF signal contains a wealth of information and structural details that are usually lost in the B-Mode representation. The HyperSPACE (Hyper SPectral Analysis for Characterization...

journal_title：Ultrasonics

authors： Granchi S,Vannacci E,Biagi E,Masotti L

更新日期：2016-05-01 00:00:00

abstract：:In acoustic and ultrasonic non-destructive testing techniques, it is sometimes beneficial to concentrate sound energy at a chosen location in space and at a specific instance in time, for example to improve the signal-to-noise ratio or activate the nonlinearity of damage features. Time Reversal (TR) techniques, taking...

journal_title：Ultrasonics

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

更新日期：2016-04-01 00:00:00

abstract：:Ultrasonic vibration cutting is an efficient cutting process for mechanical micro-machining. This process can generate intricate surface textures with different geometric characteristics. Micro-grooves/micro-channels are among the most frequently encountered micro-structures and, as such, are the focus of this paper. ...

journal_title：Ultrasonics

authors： Zhang C,Guo P,Ehmann KF,Li Y

更新日期：2016-04-01 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：:This article describes the use of the frequency domain finite element (FDFE) technique for guided wave mode selection in inhomogeneous waveguides. Problems with Rayleigh-Lamb and Shear-Horizontal mode excitation in isotropic homogeneous plates are first studied to demonstrate the application of the approach. Then, two...

journal_title：Ultrasonics

authors： Chillara VK,Ren B,Lissenden CJ

更新日期：2016-04-01 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：: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：:This paper introduces a new beamformer, which combines the eigenspace based minimum variance (ESBMV) beamformer with a subarray coherence based postfilter (SCBP), for improving the quality of ultrasound plane-wave imaging. The ESBMV beamformer has been validated in improving the imaging contrast, but the difficulty in...

journal_title：Ultrasonics

authors： Zhao J,Wang Y,Yu J,Guo W,Li T,Zheng YP

更新日期：2016-02-01 00:00:00

abstract：:The acceptance of broadband ultrasound attenuation (BUA) for the assessment of osteoporosis suffers from a limited understanding of both ultrasound wave propagation through cancellous bone and its exact dependence upon the material and structural properties. It has recently been proposed that ultrasound wave propagati...

journal_title：Ultrasonics

authors： Wille ML,Langton CM

更新日期：2016-02-01 00:00:00

abstract：:In this paper the study of frequency-dependent ultrasonic attenuation in strongly heterogeneous materials is addressed. To determine the attenuation accurately over a wide frequency range, it is necessary to have suitable excitation techniques. Three kinds of transmitted signals have been analysed, grouped according t...

journal_title：Ultrasonics

authors： Genovés V,Gosálbez J,Carrión A,Miralles R,Payá J

更新日期：2016-02-01 00:00:00

abstract：:This paper focuses on transmission characteristics of fundamental symmetric Lamb mode (So) at the junction of a main waveguide and sub-waveguides in composite laminates. Numerical simulations on transmission of So from the main to sub-waveguide revealed that transmission factors of the modes depend on stacking sequenc...

journal_title：Ultrasonics

authors： Ramadas C

更新日期：2016-01-01 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：:This paper reports the development of a two-dimensional thick film lead zirconate titanate (PZT) ultrasonic transducer array, operating at frequency approximately 7.5MHz, to demonstrate the potential of this fabrication technique for microparticle manipulation. All layers of the array are screen-printed then sintered ...

journal_title：Ultrasonics

authors： Qiu Y,Wang H,Gebhardt S,Bolhovitins A,Démoré CE,Schönecker A,Cochran S

更新日期：2015-09-01 00:00:00

abstract：:Signal modeling has been proven to be an useful tool to characterize damaged materials under ultrasonic nondestructive evaluation (NDE). In this paper, we introduce a novel digital signal model for ultrasonic NDE of multilayered materials. This model borrows concepts from lattice filter theory, and bridges them to the...

journal_title：Ultrasonics

authors： Bochud N,Gomez AM,Rus G,Peinado AM

更新日期：2015-09-01 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：: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：:As known, anomalous resisto-acoustic effect is a fundamental property for weakly inhomogeneous piezoactive waves (Bleustein-Gulyaev, Love, and some leaky waves). It consists in that the velocity of aforementioned waves first increases, achieves its maximum, and only then decreases with increasing conductance of a laye...

journal_title：Ultrasonics

authors： Kuznetsova IЕ,Zaitsev BD

更新日期：2015-05-01 00:00:00

abstract：:The paper presents the characteristics of vertically polarized surface waves generated in silicon substrate by acoustic coupling of bulk waves excited in a periodically patterned ZnO film on silicon. The finite element simulations are performed on the proposed patterned-ZnO/Si structure and vertically polarized modes ...

journal_title：Ultrasonics

authors： Santosh GS,Nemade HB

更新日期：2015-05-01 00:00:00

abstract：:Conventionally, the ultrasonic polar scan (UPS) records the amplitude or time-of-flight in transmission using short ultrasonic pulses for a wide range of incidence angles, resulting in a fingerprint of the critical bulk wave angles of the material at the insonified spot. Here, we investigate the use of quasi-harmonic ...

journal_title：Ultrasonics

authors： Kersemans M,Martens A,Van Den Abeele K,Degrieck J,Pyl L,Zastavnik F,Sol H,Van Paepegem W

更新日期：2015-04-01 00:00:00

abstract：:We studied thickness-shear and thickness-twist vibrations of a monolithic, two-pole crystal filter made from a plate of AT-cut quartz. The scalar differential equations derived by Tiersten and Smythe for electroded and unelectroded quartz plates were employed which are valid for both the fundamental and the overtone m...

journal_title：Ultrasonics

authors： Zhao Z,Qian Z,Wang B,Yang J

更新日期：2015-04-01 00:00:00

abstract：:Diversity of acoustic streaming field in a 2D rectangular chamber with a traveling wave and using water as the acoustic medium is numerically investigated by the finite element method. It is found that the working frequency, the vibration excitation source length, and the distance and phase difference between two sepa...

journal_title：Ultrasonics

authors： Tang Q,Hu J

更新日期：2015-04-01 00:00:00

abstract：:Geometrical and material property changes cause deviations in the resonant conditions used for noncollinear wave mixing. These deviations are predicted and observed using the SV(ω1)+L(ω2)→L(ω1+ω2) interaction, where SV and L are the shear vertical and longitudinal waves, respectively, and ω1, ω2 are their frequencies....

journal_title：Ultrasonics

authors： Demčenko A,Mainini L,Korneev VA

更新日期：2015-03-01 00:00:00

abstract：:Very little is known about the myometrium's physiology in terms of its elasticity but shear wave elastography could be an efficient tool to better understand it. This could considerably help the prevention of difficult births, the consequences of which are tremendous for neonate morbidity and pathologies. The purpose ...

journal_title：Ultrasonics

authors： Gennisson JL,Muller M,Gabor P,Frydman R,Musset D,Tanter M,Ami O

更新日期：2015-02-01 00:00:00

abstract：:In medical ultrasound imaging, dynamic range (DR) is defined as the difference between the maximum and minimum values of the displayed signal to display and it is one of the most essential parameters that determine its image quality. Typically, DR is given with a fixed value and adjusted manually by operators, which l...

journal_title：Ultrasonics

authors： Lee Y,Kang J,Yoo Y

更新日期：2015-02-01 00:00:00