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Archives of Acoustics
EN The aim of this paper is to describe a non-invasive method of examination of the local pulse wave velocity. The measurements were carried out in the model of the artery immersed in a water tank. Two synchronized ultrasonic apparatus VED with the ultrasonic radio frequency echoes acquisition system w[...]
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Journal of Automation Mobile Robotics and Intelligent Systems
EN The article describes the impact of the drive units on the data obtained from ultrasonic sensors. These sensors are mounted on the multi-rotor flying robot. In experiments, previously designed ultrasonic sensor was used. On purpose of this study special testbed, consisted of a dynamometer and manipu[...]
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Molecular and Quantum Acoustics
2008 Vol. 29 163-169
EN The aim of this paper is to describe a non-invasive method of examination of the local pulse wave velocity. The measurements were carried out in the elastic silicon model of the artery immersed in water tank. Two synchronized ultrasonic apparatus VED with the ultrasonic radio frequency echoes acquis[...]
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Archives of Acoustics
EN The system of hydrodynamic-type equations is derived by two-sided distribution function for a stratified gas in gravity field and applied to the problem of ultrasound. The theory is based on the generalized Gross-Jackson kinetic equation, the solution of which is built by means of locally equilibriu[...]
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Hydroacoustics
2009 Vol. 12 91-97
EN Ultrasound is a safe, convenient and inexpensive modality which may be useful for soft tissues treatment. A range of beneficial biological effects induced by ultrasound depends on the exposure levels used during treatment. At high intensities instantaneous tissue necrosis is desired, whereas at lowe[...]
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Archives of Acoustics
EN The temperature dependence of the particle size distribution (PSD) of the magnetic fluid with an additional biocompatible dextran layer was studied using a ultrasonic method. The measurements of the ultrasound velocity and attenuation were carried out as a function of the volume concentration of mag[...]
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International Journal of Occupational Safety and Ergonomics
2011 Vol. 17, No. 3 287--299
EN Conical multiple-jet nozzles, which reduce the risk of nozzle openings being blocked, are tested for their effectiveness in noise reduction. Nozzles with different exit spacings are tested. It is found that the multiple-jet design significantly decreases noise levels in the audible range by shifting[...]
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Archives of Acoustics
EN The aim of the study was the examination of the forward and reflected blood pressure waves in the common carotid artery on the basis of non-invasive ultrasonic examinations. The study concerned the effect of stenosis of the internal carotid artery caused by atherosclerosis on the mean reflection coe[...]
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Archives of Acoustics
EN The aim of this study was to examine the relation between the intima-media thickness and the wall elasticity measured simultaneously in the same cross-section of the common carotid artery. A group of 40 persons (19 healthy and 21 with hypertension and/or atherosclerosis) aged 22 to 81 were diagnosed[...]
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Environment Protection Engineering
EN The aim of the paper was to determine the influence of ultrasonic field on biodegradation of refractory compounds in leachate and on enhancement of treatment efficiency during anaerobic digestion process. In the first step of this investigation, the optimal ultrasound parameters, i.e. amplitude and [...]
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Archives of Acoustics
2016 Vol. 41, No. 4 741--746
EN In this paper a possibility of determining a local velocity of the surface acoustic Rayleigh waves using a transducer, with the rigidly connected emitting and receiving parts, is considered. A problem on spatial resolution of such a transducer for investigation of inhomogeneous specimens is also exa[...]
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Bio-Algorithms and Med-Systems
2015 Vol. 11, no. 4 217--222
EN This study presents the use of endobronchial ultrasound (EBUS) for imaging and dimensional measurements of a trachea. An assessment of shape reproduction accuracy was based on a comparative method using oneand two-later models. It was found that dimensions determined from EBUS scans of digital model[...]
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Molecular and Quantum Acoustics
2005 Vol. 26 261-266
EN The radiation characteristics of the ultrasound transducers can be calculated by means of the concurrent algorithm. This approach is necessary when the calculations are performed on a computer cluster and additionally allows to enhance greatly the overall efficiency of such an algorithm. This paper [...]
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Hydroacoustics
2016 Vol. 19 361--368
EN The aim of this work was to use the streaming phenomena to assist clot dissolution in blood vessel. Such treatment is called sonothrombolysis. Acoustic streaming is a steady flow in a fluid driven by the acoustic wave propagating in a lossy medium. It is a non-linear effect and it depends on ultraso[...]
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Inżynieria Rolnicza
2005 R. 9, nr 1 137--144
PL W pracy przedstawiono wyniki pomiarów prędkości propagacji fali ultradźwiękowej w ziemniakach suszonych konwekcyjnie. Pomiarów dokonywano w trakcie procesu suszenia za pomocą 50 kHz głowic ultradźwiękowych współpracujących z komputerem PC wyposażonym w kartę defektoskopu ultradźwiękowego UMT-12. Otr[...]
EN The work presents the results of measurements regarding the supersonic wave propagation in potatoes dried with convection drying. The measurements were done during the drying process with 50 kHz supersonic transducers cooperating with a supersonic flaw detector card UMT-12. The obtained results were[...]
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Journal of Research and Applications in Agricultural Engineering
2013 Vol. 58, nr 1 189--192
PL W artykule przedstawiono metodę monitorowania konstytuowania połączenia adhezyjnego typu powłoka szpachlówkowapodłoże stalowe. Badania wykonano na próbkach stalowych. Celem badań było wyznaczenie, na podstawie zmiany wysokości impulsu ultradźwiękowego, trendu zmiany wzmocnienia sygnału i modułu ciśn[...]
EN A method used for monitoring the formation process of adhesive bond type car putty coating and steel substrate is presented in this article. In the experiment some samples made of steel and universal car putty are used. The main goal of the experiment is to designate changes of two parameters: the v[...]
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Polish Journal of Chemical Technology
EN Ultrasonic irradiation is one of the advanced oxidation methods used in wastewater treatment. In this study, ultrasonic treatment of petroleum refinery effluent was examined. An ultrasonic homogenizator with a 20 kHz frequency and an ultrasonic bath with a 42 kHz frequency were used as a source for [...]
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Archives of Acoustics
2007 Vol. 32, No. 4 851--857
EN The developed solver of acoustic field was used for simulation of the artery wall thickness examination. It is capable of describing spatial and time-dependent distribution of an ultrasonic beam, that is emitted by a piezoelectric ring transducer and then backscattered on cylindrical surfaces of the[...]
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Journal of Automation Mobile Robotics and Intelligent Systems
EN The effects related with formation of induced anisotropy in natural-isotropic media, have been studied already for a long time. These phenomena interest scientists first of all due to a rare opportunity of control of artificial anisotropy of media, and also due to an opportunity of the energy transf[...]
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Napędy i Sterowanie
2008 R. 10, nr 9 159-160
PL Wszystkie pracujące urządzenia i większość przecieków są źródłem szerokopasmowego dźwięku (hałasu). Jego część wysokoczęstotliwościowa (ultradźwiękowa) charakteryzuje się małą długością fali. Sygnał ten jest wyraźnie kierunkowy. Dlatego można wyizolować ten sygnał z hałasu tła i dokładnie określić p[...]
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