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Wyświetlanie 1-10 z 14
Tytuł:
Autonomous hydroacoustic sound velocity profiler
Autorzy:
Jedel, A.
Marszal, J.
Ostrowski, Z.
Kilian, L.
Powiązania:
https://bibliotekanauki.pl/articles/332093.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
hydroacoustics
sound velocity profiler
Opis:
The paper presents the autonomous hydroacoustic sound velocity profiler collaborating with ordinary PC by small box included interface & battery charger. The measurement and calibration methods and block diagram of the meter are presented as well as principles of operation, data collection, selection and transmission. There are described three versions of this meter - dropped from "normal" ships, installed in the light hull of submarines and casings in the hulls of variable depth sonar antennas.
Źródło:
Hydroacoustics; 2003, 6; 261-266
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of meat types by ultrasonic methods
Autorzy:
Nowak, K. W.
Powiązania:
https://bibliotekanauki.pl/articles/298316.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
ultrasonics
sound velocity
meat
identification
Opis:
The ability of identification of meat types using ultrasonic measurement was evaluated in this work. Four types of muscles were analyzed (turkey breast and thigh, and pork loin and ham). Ultrasonic measurements were performed at storage (5 ±1oC) and room (20±1oC) temperatures using the through-transmission technique and differential method of determination of sound velocity and the attenuation coefficient. The mean values of sound velocity for the breast, thigh, loin and ham were respectively: 1550.7, 1536.6, 1558.7, 1559.7 m/s at the storage temperature, and 1582.7, 1578.5, 1596.9, 1592.7 m/s at the room temperature. The mean values of the attenuation coefficient in the same order were: 21.3, 23.2, 30.6, 28.1 m-1 and 22.2, 18.9, 22.0, 22.4 m-1. Statistically significant differences in the sound velocity were observed between pork and turkey muscles, therefore, the meat of those species can be identified based on ultrasound measurements of sound velocity. The attenuation coefficient cannot be applied in the identification of meat types due to absence of significant differences in the mean values.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2015, 18(2); 79-84
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excess parameter studies on tetrahydropyran with 1-hexanol at T = 298.15 to 318.15 K using Anton Paar
Autorzy:
Anil Kumar, K.
Srinivasu, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/412142.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Sound velocity
Densities
Excess parameters
THP
1-Hexanol
Binary mixtures
Opis:
Sound velocity, densities of binary mixture of Tetrahydropyran (THP) with 1-hexanol has been measured over the entire range of composition at T = 298.15 to 318.15 K. The excess parameters viz., excess sound velocity, deviations in isentropic compressibility, excess molar volume, excess free length and excess acoustic impedance are deduced from experimental values and discussed intermolecular interactions present in the mixture. At the end all the parameters have been fitted to Redlich-Kister equation and their coefficients are obtained.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 2; 114-124
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical properties and sound velocity of gold copper (AuCu) II superlattice: 3D molecular dynamic (MD) simulation
Autorzy:
Aish, Mohammed Mahmoud
Powiązania:
https://bibliotekanauki.pl/articles/1839596.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
sound velocity
rigidity
Young’s modulus
Poisson’s ratio
density
Opis:
Young’s modulus, yield stress and Poisson’s ratio are studied for different size and tem- perature. The temperature dependence of simulated Young’s modulus is quite similar to experimental results. Transverse sound velocity is estimated from the simulated elastic con- stants at each temperature. The dislocation speed reaches up to 75% of the transverse sound velocity. The dislocation speed decreases with increasing temperature linearly. The tempera- ture dependence of macroscopic deformation behavior and the possibility of the existence of supersonic dislocations are discussed. The transverse sound velocity and rigidity G is calcu- lated from Young’s modulus, Poisson’s ratio and density ρ which changes with temperature.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 4; 901-909
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Measurement of Physical and Acoustical Parameters of Poly(Ethyleneglycol-400 Maleate) Resin
Autorzy:
Pandya, Dhananjay
Parsania, P. H.
Powiązania:
https://bibliotekanauki.pl/articles/1075756.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Acoustical parameters
FT-IR
Physical parameters
Poly(Ethyleneglycol-400 Maleate) resin
Sound velocity
Synthesis
Viscosity
Opis:
Poly(Ethyleneglycol-400 Maleate) Resin was synthesized and characterized by FT-IR. The physical and acoustical parameters such as Intrinsic viscosity, Acid value, Density, Viscocity, Sound velocity, Wavelength, Isentropic compressibility, Specific acoustical impedance, Rao’s molar sound function, Apparent molecular weight, Van-der Waal’s constant, Internal pressure, Classical absorption coefficient, Viscous relaxation time, Solvation number, Apparent molar volume, Apparent molar compressibility, Free volume and Inter molecular free path length were determined.
Źródło:
World Scientific News; 2019, 118; 144-163
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Measurement of Physical and Acoustical Parameters of Poly(Ethyleneglycol-600 Maleate) Resin
Autorzy:
Pandya, Dhananjay
Parsania, P. H.
Powiązania:
https://bibliotekanauki.pl/articles/1076046.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Acoustical parameters
FT-IR
Physical parameters
Poly(Ethyleneglycol-600 Maleate) resin
Sound velocity
Synthesis
Viscosity
Opis:
Poly(Ethyleneglycol-600 Maleate) Resin was synthesized and characterized by FT-IR. The physical and acoustical parameters such as Intrinsic viscosity, Acid value, Density, Viscocity, Sound velocity, Wavelength, Isentropic compressibility, Specific acoustical impedance, Rao’s molar sound function, Apparent molecular weight, Van-der Waal’s constant, Internal pressure, Classical absorption coefficient, Viscous relaxation time, Solvation number, Apparent molar volume, Apparent molar compressibility, Free volume and Inter molecular free path length were determined.
Źródło:
World Scientific News; 2019, 117; 82-101
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the Change in the Tin Concentration in Bronzes to the Basic Components of the Sound of Bells
Autorzy:
Cekus, Dawid
Nadolski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2049724.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-tin bronze
components of the sound of bell
frequency analysis
mechanical properties
velocity of sound
Opis:
The subject of the study was to determine the impact of changes in mechanical properties of high-tin bronzes on the basic components of the sound of a bell. Change in the tin concentration in the range of about 7.5 to 20 parts wt. in a casting alloy significantly affects the mechanical properties of the alloy such as Young’s modulus or hardness. The free vibrations of bells were obtained with the help of the finite element method. In the numerical analyses the mechanical properties of standard alloys were adopted. The obtained natural frequencies of the bell made of a bronze with different tin concentration in copper were compared with the acoustic properties of a real bell casted on the basis of the same ribs. A significant effect of the increase in the alloying share of tin on the obtained results was stated. In addition, the acoustic analysis of aluminum bronze C95500 have been performed. Based on the obtained results, authors stated that this material can replace the commonly used high tin bronze C91300 for the unit production of bells.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 531-535
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New instrument for measuring the velocity of sound in gases and quantitative characterization of binary gas mixtures
Autorzy:
Koturbash, T.
Bicz, A.
Bicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/114208.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
ultrasonic measurement
velocity of sound
speed of sound
natural gas
time of flight
characterization of gas mixture
analysis of gas mixture
Opis:
A new instrument for precise measurements of velocity of sound in gases was developed and tested. The instrument implements improved velocity of sound measuring technique based on time-of-flight measurement of ultrasonic pulses. The instrument was developed primarily for conducting measurements in natural gas, it can operate in wide ranges of natural gas compositions as well as other gas mixtures with velocity of sound parameter in range of 200 to 500 m/s. The instrument allows conducting measurement of velocity of sound propagation in various gas mixtures with average repeatability of equal to ±1 cm/s at normal conditions. The accuracy of measurement depends on calibration conditions and approach, and has good agreement with theoretically calculated values. The instrument has a modular design of control unit and flow-through measuring chamber. The set of distinctive features and adjustable measuring parameters of the instrument allows further improving of applicability for other gases and gas mixtures and various measurement conditions. The instrument showed good performance in the task of quantitative characterization of binary gas mixtures by velocity of sound parameter.
Źródło:
Measurement Automation Monitoring; 2016, 62, 8; 254-258
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Leznikovskiy granite by ultrasonic methods
Badania właściwości granitu Leznikovskiego złoża metodą ultradźwiękową
Autorzy:
Korobiichuk, I.
Korobiichuk, V.
Hajek, P.
Kokes, P.
Juś, A.
Szewczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/219748.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
granit
kamień naturalny
siła ściskająca
naprężenia
prędkości dźwięku
granite
natural stone
compressive strength
tension
velocity of sound
Opis:
The samples of Leznikovskуi granite deposit from different parts of the quarry were exposed to pull and compression test. The test findings showed that the samples do not only have different shades of red but also mechanical properties. The unloaded ultrasound examination of samples was also performed. 31 rock samples were exposed to compression test. The influence of the explosion-based mining technology on mechanical properties of the rocks was identified. The findings of experimental research of the rock sound velocity dependence on rock compression were presented. The research findings can be applied in diagnostics of construction elements made of natural stone in the course of installation.
Próbki granitu z Leznikovskiego złoża uzyskane z różnych części kamieniołomu poddano próbom ściskania i rozciągania. Sprawdzono również prędkość rozchodzenia się dźwięku wewnątrz próbek obciążonych i nieobciążonych. Przeprowadzone badania wykazały, że próbki różnią się nie tylko odcieniami czerwieni, ale również właściwościami mechanicznymi. W wyniku przeprowadzonych prób ściskania 31 kamiennych próbek zidentyfikowano wpływ wybuchów wykonywanych podczas wydobywania skały na jej właściwości mechaniczne. W pracy przedstawiono eksperymentalne charakterystyki prędkości rozchodzenia się dźwięku w próbkach w funkcji naprężeń ściskających, którym są one poddawane. Charakterystyki te mogą być zastosowane w diagnostyce elementów konstrukcyjnych wykonanych z kamienia naturalnego podczas ich instalacji.
Źródło:
Archives of Mining Sciences; 2018, 63, 1; 75-82
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using Microphone Arrays to Detect Moving Vehicle Velocity
Autorzy:
Peral-Orts, R.
Velasco-Sánchez, E.
Campillo-Davó, N.
Campello-Vicente, H.
Powiązania:
https://bibliotekanauki.pl/articles/177948.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microphone array
sound location
moving sources
vehicle velocity
Opis:
The noise of motor vehicles is one of the most important problems as regards to pollution on main roads. However, this unpleasant characteristic could be used to determine vehicle speed by external observers. Building on this idea, the present study investigates the capabilities of a microphone array system to identify the position and velocity of a vehicle travelling on a previously established route. Such linear microphone array has been formed by a reduced number of microphones working at medium frequencies as compared to industrial microphone arrays built for location purposes, and operates with a processing algorithm that ultimately identifies the noise source location and reduces the error in velocity estimation
Źródło:
Archives of Acoustics; 2013, 38, 3; 407-415
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
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