The echocardiophone: a new means for observing spatial movement of the heart.

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：:In this paper, we investigated theoretically and experimentally the effect of the conductivity of the film located in the immediate vicinity of the free side of a piezoelectric resonator based on the PZT ceramics on its characteristics. It is shown that with increasing the conductivity of the film at first the paralle...

journal_title：Ultrasonics

authors： Zaitsev BD,Semyonov AP,Teplykh AA,Borodina IA

更新日期：2019-04-01 00:00:00

abstract：:Reflections of 4 MHz ultrasound pulses from 60 sites on 15 human aorta specimens were analysed using the plane-wave Born approximation (PWBA) inverse scattering method. The recovered high-resolution acoustic impedance profile for each site was correlated with an analysis (by microscope) of sections taken from that sit...

journal_title：Ultrasonics

authors： Tobocman W,Santosh K,Carter JR,Haacke EM

更新日期：1995-07-01 00:00:00

abstract：:Human umbilical cords were exposed to high amplitude focussed ultrasonic pulses with focal energy densities 0.6 and 0.4 mJ mm-2. The endothelium of the exposed vessel (vein) was examined by means of confocal laser scanning microscopy and scanning electron microscopy. The degree of tissue change ranged from the inducti...

journal_title：Ultrasonics

authors： Seidl M,Steinbach P,Wörle K,Hofstädter F

更新日期：1994-09-01 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：:The wear behaviors of grinding wheel have significant influence on the work-surface topography. However, a comprehensive and quantitative method is lacking for evaluating the wear conditions of grinding wheel. In this paper, a fractal analysis method is used to investigate the wear behavior of resin-bonded diamond whe...

journal_title：Ultrasonics

authors： Wang Q,Zhao W,Liang Z,Wang X,Zhou T,Wu Y,Jiao L

更新日期：2018-03-01 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：: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 T-matrix approach is used to calculate the scattering of sound waves by an ellipsoidal void in a fluid. Results are presented for the total cross-section of a sphere as a function of frequency; this is related to the detection of the onset of bends in divers. Results are also presented for the angular variation in...

journal_title：Ultrasonics

authors： Cooper G,Temple JA

更新日期：1983-07-01 00:00:00

abstract：:Most methods used to measure the thickness of thin liquid or solid surface films and coatings need access to the coated surface. In this work reflected ultrasonic pulses were used to measure a coating thickness from a solid back face. Piezoelectric transducers on the solid back face emitted ultrasound waves and receiv...

journal_title：Ultrasonics

authors： Kanja J,Mills R,Li X,Brunskill H,Hunter AK,Dwyer-Joyce RS

更新日期：2021-02-01 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：:In this paper, an improved touch probe sensor device for higher sensitivity and low contact force is reported. In order to improve the resolution, we have evaluated the sensitivity and fabricated a miniaturized sensor. The sensor transducer was 3 mm long and had higher resonance frequency. The resonance frequency of t...

journal_title：Ultrasonics

authors： Kanda T,Kurosawa MK,Higuchi T

更新日期：2002-05-01 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：: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：: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：:This paper presents a system that accurately measures the distance travelled by ultrasound waves through the air. The simple design of the system and its obtained accuracy provide a tool for non-contact distance measurements required in the laser's optical system that investigates the surface of the eyeball. ...

journal_title：Ultrasonics

authors： Licznerski TJ,Jaroński J,Kosz D

更新日期：2011-12-01 00:00:00

abstract：:In this study, we found that microbubbles with diameters of less than 100μm can be easily generated by using a hollow cylindrical ultrasonic horn. Consecutive images of bubbles obtained by using high-speed and high-resolution cameras reveal that a capillary wave is formed on the gas-liquid interface under weak ultraso...

journal_title：Ultrasonics

authors： Makuta T,Suzuki R,Nakao T

更新日期：2013-01-01 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：:This paper describes fabrication and comparison of PMN-PT single crystal, PZT, and PZT-based 1-3 composite ultrasonic transducers for NDE applications. As a front matching layer between test material (Austenite stainless steel, SUS316) and piezoelectric materials, alumina ceramics was selected. The appropriate acousti...

journal_title：Ultrasonics

authors： Kim KB,Hsu DK,Ahn B,Kim YG,Barnard DJ

更新日期：2010-08-01 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：:In this paper, the resonance frequency equation and expression of displacement amplitude magnifications of a full-wave barber ultrasonic horn are obtained. By discussing the relationships between the displacement amplitude magnifications and the geometrical dimensions, the optimized design of the horn for the largest ...

journal_title：Ultrasonics

authors： Fu Z,Xian X,Lin S,Wang C,Hu W,Li G

更新日期：2012-07-01 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：:The remote inspection for defects in large metallic elements such as pipes, tubes and plates is a field where guided waves are being applied with success. There are a number of situations where a surface coating is added for corrosion protection or insulation purposes. Since the coating materials are usually viscoelas...

journal_title：Ultrasonics

authors： Galán JM,Abascal R

更新日期：2004-04-01 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：: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：: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：: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：:Effective receive beamforming in medical ultrasound imaging is important for enhancing spatial and contrast resolution. In current ultrasound receive beamforming, a constant sound speed (e.g., 1540m/s) is assumed. However, the variations of sound speed in soft tissues could introduce phase distortions, leading to degr...

journal_title：Ultrasonics

authors： Yoon C,Lee Y,Chang JH,Song TK,Yoo Y

更新日期：2011-10-01 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：:To improve the integrated performance of a representative bimodal linear ultrasonic motor under continuous operation, this paper proposes a novel dual-frequency asymmetric excitation method for such motors which can operate under traditional single-phase asymmetric or two-phase symmetric excitation modes. In particula...

journal_title：Ultrasonics

authors： Li X,Huang Y,Zhou L

更新日期：2020-12-01 00:00:00