Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "sound speed" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 21
Tytuł:
Application of non-uniform B-Splines of 2-nd order for description vertical distribution of sound speed in water
Autorzy:
Makar, A.
Powiązania:
https://bibliotekanauki.pl/articles/332798.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
hydroacoustics
B-splines
sound speed
Opis:
Modeling of the vertical distribution of the sound speed in water is useful during determination of the depth on the basis of the acoustic method, modeling refraction phenomena and determination the trajectory of the acoustic wave. For modeling 1D functions (vertical distribution of the sound speed) and 2D (surface of the sea bottom for hydrography) uniform B-Splines was used. In this paper description of uniform B-Splines and description and application of non-uniform B-Splines have been presented.
Źródło:
Hydroacoustics; 2009, 12; 133-140
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron annihilation and speed of sound in the systems containing beta-cyclodextrin
Autorzy:
Jerie, K.
Baranowski, A.
Burakowski, A.
Gliński, J.
Powiązania:
https://bibliotekanauki.pl/articles/146303.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
sound speed
compressibility
positron annihilation
cyclodextrin
alcohol
inclusion compounds
Opis:
Positron annihilation measurements were performed in aqueous solutions of beta-cyclodextrin, as well as in solid mixtures of this sugar with a long-chained alcohol, n-nonanol. Additionally, acoustic (sound speed, density and compressibility) experiments were done in aqueous beta-cyclodextrin and tert-butanol systems and in a three-component water-beta-cyclodextrin-tert-butanol system. The results show that in aqueous solution cyclodextrin does not form inclusive complexes with alcohol, while solid sugar-alcohol mixtures undergo slow changes in time, most probably caused by exchange of guest between interior and exterior of the host molecule.
Źródło:
Nukleonika; 2010, 55, 1; 65-68
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the Method for Determining the Interaction of Cotton With the Working Bodies of Cotton Gins
Autorzy:
Sailov, Rahib Aqaqul
Powiązania:
https://bibliotekanauki.pl/articles/2200751.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
fibre damage
cottonseed
sound speed
cleaning process
cotton raw material
Opis:
A theoretical regularity of the general behaviour of raw cotton as a porous medium in the technological processes of its mechanical processing has been substantiated for the first time. The speed of sound in a porous cotton medium has now been determined. The effect of additional force stresses inside the cotton medium caused by the filtration of the air component from cotton raw materials during the introduction of the working body, has been disclosed. A generalized equation that describes the force stress in a cotton medium when exposed to a variety of shapes of working bodies of cotton machines has been worked out. A method for calculating the damage to seeds and cotton fibers caused by their interactions with the working bodies of processing machines has been proposed. The resultant theory that describes the stress state of cotton raw materials during processing allows us to use it practically to solve all important issues pertaining to the damage of fiber and cotton seeds that occur by using technological solutions in primary processing of cotton operations.
Źródło:
Fibres & Textiles in Eastern Europe; 2022, 6 (151); 74--79
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorithm for Computationally Efficient Imaging of Sound Speed in Conventional Ultrasound Sonography
Autorzy:
Karwat, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/31339779.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
speed of sound
ultrasound imaging
computational complexity
Opis:
The speed of sound (SoS) in tissues reflects their mechanical properties and therefore can carry valuable diagnostic information. In conventional ultrasound sonography (US), however, this information is not readily available. Furthermore, since the actual SoS is unknown, image reconstruction is carried out using an average SoS value for soft tissues. The resulting local deviations from the actual SoS lead to aberrations in US images. Methods for SoS imaging in US therefore have the potential to enable the correction of aberrations in classical US. In addition, they could also become a new US modality. There are several approaches to SoS image reconstruction. They differ in terms of input data requirements, computational complexity, imaging quality, and the potential for signal analysis at the intermediate stages of processing. This article presents an algorithm with multi-stage processing and low computational complexity. The algorithm was verified through numerical simulations and phantom measurements. The obtained results show that it can correctly estimate SoS in layered media, which in most cases model the tissue structure well. With its computational complexity of O(n), the algorithm can be implemented in real-time ultrasound imaging systems with limited hardware performance, such as portable ultrasound devices.
Źródło:
Archives of Acoustics; 2023, 48, 4; 549-558
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Improved Approximation for DIPPR-Based Predicting Speed of Sound in Long-Chained n-Alkanes
Autorzy:
Postnikov, E. B.
Nedyalkov, Y. V.
Polishuk, I.
Powiązania:
https://bibliotekanauki.pl/articles/177788.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
n-alkanes
isothermal compressibility
speed of sound
Opis:
In this short communication, we revise a correlation for the saturated liquid isothermal compressibility based on the data available in DIPPR (Postnikov, 2016) which considers the molecular non-sphericity and addresses a problem of predicting speeds of sound in saturated long-chained alkanes. In addition, we correct a misprint appeared in the cited work and provide programming code used for the realisation of the proposed calculations.
Źródło:
Archives of Acoustics; 2018, 43, 3; 537-541
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Can DIPPR Database be Used for an Estimation of the Speed of Sound? A Case Study of Liquid Hydrocarbons
Autorzy:
Postnikov, E. B.
Powiązania:
https://bibliotekanauki.pl/articles/177811.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
speed of sound
DIPPR
reduced bulk modulus
internal pressure
Opis:
The paper analyses a possibility of utilising the information which is contained in DIPPR database for a calculation of the speed of sound, which is absent there. As an example, liquid hydrocarbons are considered: n-hexane, 1-hexene, cyclohexane, cyclohexene, benzene, and 1-hexanols, as well as representatives of n-alkanes with various hydrocarbon chain lengths. It is shown that the Brelvi-O’Connell correlation for the reduced bulk modulus, supplied with the correlations for the internal pressure at the normal boiling temperature, results in the values having accuracy comparable with other DIPPR data for the region below the boiling point bounded by the values of the reduced density around pr ≈ 3.5. The source of errors originated from the Brelvi-O’Connell correlation for larger reduced densities is discussed.
Źródło:
Archives of Acoustics; 2016, 41, 4; 713-719
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Are the Heat Capacities of Liquids Calculated from Speeds of Sound and pρT Relationships Reliable? A Comparison with the Reference Values and a Discussion of the Uncertainties
Autorzy:
Szpaczek, Sylwia
Marczak, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/31339956.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
speed of sound
density
compressibilt
expansibility
calorimetr
elevated pressure
Opis:
Recent advances in the construction of speed of sound meters made high-accuracy routine measurements possible in laboratories non-specialized in physical acoustics. Reliable values of the isentropic compressibility can be obtained from speeds of sound and densities of liquids using the Laplace formula. Strict thermodynamic relationships connect the isentropic compressibility of a medium and its density as a function of temperature and pressure with the heat capacity. These relationships result from the principles of thermodynamics and require no approximations or molecular models. In this study, the heat capacities of twelve liquids: hydrocarbons, acetonitrile, and ionic liquids were calculated from the speeds and densities taken from the literature sources. The agreement of the calculation results with the reference heat capacities, either critical values or measured calorimetrically, was satisfactory. The relative uncertainty of the calculated heat capacities was rather conservatively estimated for 5%. If the measurement procedures were optimized for heat capacity determination, better results would be attained, with the uncertainty probably smaller than 1%. Thus, the speed-and-density method is a potential alternative to classical calorimetry.
Źródło:
Archives of Acoustics; 2022, 47, 4; 547-554
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isotope effects on selected physicochemical properties of nitromethane and 1-pentanol
Autorzy:
Makowska, A.
Szydłowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/148594.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
deuterium
isotope effects
density
viscosity
speed of sound
nitromethane
1-pentanol
Opis:
Densities, kinematic viscosities, speed of sound and refractive indices of nitromethane and 1-pentanol and their deuterated derivatives CD3NO2 and C5H11OD were measured. The data obtained allowed to calculate molar volumes, dynamic viscosities, isentropic compressibilities and isobaric thermal expansion. Deuterium isotope effect on the selected physicochemical properties of both nitromethane and 1-pentanol has been determined. Large isotope effects characterizing density, viscosity and speed of sound are observed for nitromethane and much smaller for 1-pentanol. Isotope effects on molar volume are small both for nitromethane and 1-pentanol, but of the opposite sign. These observations are in agreement with the expectations.
Źródło:
Nukleonika; 2006, 51,suppl.2; 81-85
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Nonlinearity Parameter B/A, Internal Pressure, and Acoustic Impedance Determined at Pressures up to 100 MPa for 1-Ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide
Autorzy:
Zorębski, E.
Zorębski, M.
Dzida, M.
Powiązania:
https://bibliotekanauki.pl/articles/177585.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nonlinearity parameter
speed of sound
high pressure
ionic liquids
internal pressure
Opis:
The nonlinearity parameter B/A, internal pressure, and acoustic impedance are calculated for a room temperature ionic liquid, i.e. for 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide for temperatures from (288.15 to 318.15) K and pressures up to 100 MPa. The B/A calculations are made by means of a thermodynamic method. The decrease of B/A values with the increasing pressure is observed. At the same time B/A is temperature independent in the range studied. The results are compared with corresponding data for organic molecular liquids. The isotherms of internal pressure cross at pressure in the vicinity of 70 MPa, i.e. in this range the internal pressure is temperature independent.
Źródło:
Archives of Acoustics; 2016, 41, 1; 59-66
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiar prędkości dźwięku w cieczach metodą projekcji cienia fali stojącej w praktyce pokazowej w nauczaniu fizyki
Measuring the speed of sound in liquids via a laser projection of the shadow of a standing wave in demonstrations in physics education
Autorzy:
Gawrysiak, Ignacy
Powiązania:
https://bibliotekanauki.pl/articles/32388076.pdf
Data publikacji:
2023
Wydawca:
Fundacja PSC
Tematy:
laser
projection
standing wave
demonstration
ultrasound
speed of sound
frequency
wavelength
Opis:
Article puts under scrutiny a method of measuring the speed of sound in liquids via a laser projection of a standing wave. The range of application of the particular method was examined. A procedure of conducting the demonstration has been formulated based on the analysis of the impact of several parameters of the demonstration setup: particular vessel, depth of the liquid, position of the cone of light with regards to the stationary wave and particular sample used were all evaluated with regards to the quality of the demonstration as well as reliability of the measurement. Applying the procedure in order to quantitatively determine the concentration of a solution has been attempted, as well as usefulness of the method in a demonstration context – examined. As a conclusion, the potential of applying the method for demonstration has been discussed and an instruction for such demonstration has been produced.
Źródło:
Alcumena. Pismo Interdyscyplinarne; 2023, 2(14); 13-46
2719-9851
Pojawia się w:
Alcumena. Pismo Interdyscyplinarne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pozyskiwanie danych do tworzenia numerycznego modelu DNA
Obtaining of data for digital sea bottom model
Autorzy:
Makar, A.
Naus, K.
Powiązania:
https://bibliotekanauki.pl/articles/130376.pdf
Data publikacji:
2003
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
pomiary hydrograficzne
numeryczny model dna
prędkość dźwięku w wodzie
przechyły boczne i wzdłużne
hydrographic surveys
digital sea bottom model
sound speed in water
pitch
roll
Opis:
W artykule przedstawiono proces pozyskiwania danych do tworzenia numerycznego modelu dna, zarówno morskiego, jak i akwenów śródlądowych. Ze względu na wykorzystywanie w pomiarach morskich tych samych systemów pozycyjnych, co w pomiarach lądowych, scharakteryzowano wyłącznie aparaturę do pomiaru głębokości oraz urządzenia do pomiarów towarzyszących. Przedstawiono technologię prowadzenia pomiarów, zakłócenia ruchu jednostki pomiarowej oraz możliwości zwiększenia dokładności pomiarów hydrograficznych.
In this paper has been shown the process of obtaining of data for digital model of sea and inland bottom. Because of usage during sea surveys and terrestrial measurements these same positioning systems, there have been described only instruments for depth and accompanying measurements. There also have been presented the technology of surveying, movement disruptions of the sounding vessel and possibilities of increasing the accuracy of the hydrographic surveys.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2003, 13a; 163-170
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationships between acoustical properties and stiffness of soft tissue phantoms
Autorzy:
Gambin, B.
Kruglenko, E.
Byra, M.
Powiązania:
https://bibliotekanauki.pl/articles/332049.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
soft tissue phantoms
elastography
ultrasound attenuation
speed of sound
Nakagami maps
stiffness
Opis:
Polyvinyl-alcohol cryogel is commonly used for soft tissue phantom manufacture. The gel formation from an aqueous solution of polyvinyl-alcohol takes place during the freezing and thawing cycle. The aim of this work was to assess the degree of gel solidification, hence the material stiffness, by means of quantitative ultrasound. We manufactured three phantoms which differed in the number of freezing/thawing cycles. First, tissue phantoms were examined with an elastography technique. Next, we measured the speed of sound and the attenuation coefficient. What is more, the inter structure variations in phantoms were assessed with the Nakagami imaging which quantifies the scattering properties of the backscattered ultrasound echo. Obtained results confirmed the connection between the number of freezing/thawing cycles and the solidification p rocess. We d efined th e bo undary layer as a region which has a different structure than the sample interior. Next, for each phantom this layer was extracted based on a Nakagami parameter map. We calculated that the thickness of the boundary layer was lower in samples which were subjected to a larger number of freezing/thawing cycles.
Źródło:
Hydroacoustics; 2016, 19; 111-120
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on thermodynamic properties of binary mixtures of diethyl carbonate with benzonitrile, benzaldehyde at different temperatures
Autorzy:
Sudhamsa, B.
Babu, M. S.
Narendra, K.
Powiązania:
https://bibliotekanauki.pl/articles/411534.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
binary mixtures
excess adiabatic compressibility
excess free length
excess speed of sound
Opis:
The speed of sound and density in binary liquid mixture of diethyl carbonate + benzonitrile, + benzaldehyde have been determined at temperatures 298.15, 308.15 and 318.15 K over the whole composition range. The data have been utilized to estimate the excess adiabatic compressibility (βE), excess intermolecular free length (Lf E), excess speed of sound (uE) at the above temperatures. The excess values have been found to be useful in estimating the strength of the interactions in the liquid mixtures.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 1; 1-7
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Ultrasonic Methods for Evaluation of High-Pressure Physicochemical Parameters of Liquids
Autorzy:
Kiełczyński, Piotr
Ptasznik, Stanisław
Szalewski, Marek
Balcerzak, Andrzej
Wieja, Krzysztof
Rostocki, Aleksander J.
Powiązania:
https://bibliotekanauki.pl/articles/176703.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
ultrasonic methods
speed of sound
acoustic impedance
surface tension
thermal conductivity
physicochemical properties
Opis:
An emerging ultrasonic technology aims to control high-pressure industrial processes that use liquids at pressures up to 800 MPa. To control these processes it is necessary to know precisely physicochemical properties of the processed liquid (e.g., Camelina sativa oil) in the high-pressure range. In recent years, Camelina sativa oil gained a significant interest in food and biofuel industries. Unfortunately, only a very few data characterizing the high-pressure behavior of Camelina sativa oil is available. The aim of this paper is to investigate high pressure physicochemical properties of liquids on the example of Camelina sativa oil, using efficient ultrasonic techniques, i.e., speed of sound measurements supported by paralel measurements of density. It is worth noting that conventional low-pressure methods of measuring physicochemical properties of liquids fail at high pressures. The time of flight (TOF) between the two selected ultrasonic impulses was evaluated with a cross-correlation method. TOF measurements enabled for determination of the speed of sound with very high precision (of the order of picoseconds). Ultrasonic velocity and density measurements were performed for pressures 0.1-660 MPa, and temperatures 3-30°C. Isotherms of acoustic impedance Za, surface tension σ and thermal conductivity k were subsequently evaluated. These physicochemical parameters of Camelina sativa oil are mainly influenced by changes in the pressure p, i.e., they increase about two times when the pressure increases from atmospheric pressure (0.1 MPa) to 660 MPa at 30°C. The results obtained in this study are novel and can be applied in food, and chemical industries.
Źródło:
Archives of Acoustics; 2019, 44, 2; 329-337
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyznaczanie prędkości dźwięku w powietrzu przy użyciu karty muzycznej komputera
Determination of speed of sound in air using a computers sound card
Autorzy:
Grodzicki, M.
Adam, S.
Powiązania:
https://bibliotekanauki.pl/articles/271307.pdf
Data publikacji:
2014
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
prędkość dźwięku
karta muzyczna
komputer PC
stanowisko edukacyjne
speed of sound
sound card
personal computer
educational stand
Opis:
Praca przedstawia sposób wykonania pomiaru prędkości rozchodzenia się dźwięku w powietrzu przy użyciu karty muzycznej komputera PC. Celem artykułu jest demonstracja prostego układu pomiarowego, umożliwiającego wyznaczenie prędkości dźwięku nawet w warunkach domowych, praktycznie bez nakładów finansowych. Zestaw pomiarowy składa się z komputera wyposażonego w kartę muzyczną, dwóch mikrofonów i głośnika. Generowane dźwięki są odbierane przez mikrofony i analizowane przez napisany na potrzeby projektu program komputerowy. Prezentowane doświadczenie może być wykorzystane w procesie dydaktycznym, np. do demonstracji na wykładach lub jako zestaw do wykonania ćwiczenia na I pracowni fizycznej. Autorzy prezentują stanowisko doświadczalne oraz ilustrują jego działanie wykonanymi pomiarami.
The paper presents a measurement method for the speed of sound in air by using a PC sound card. The aim is to demonstrate a simple measurement system, which allows for measurement of the speed of sound even at home, and is available at minimal cost. The measurement setup consists of a PC with a sound card, two microphones and a speaker. The generated sounds are received by microphones and analyzed by the software specially elaborated for the project. The presented experiment can be used in the teaching process, e.g. as a demonstration at lectures or a setup for physical training lab. The authors present the experimental stand and illustrate its performance with standard measurements.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2014, 19, 4; 333-340
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies