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    Wyświetlanie 1-14 z 14
    Tytuł:
    Determination of the fraction of paramagnetic centers not-fulfilling the Curie law in coal macerals by the two-temperature EPR measurement method
    Autorzy:
    Słowik, G. P.
    Więckowski, A. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/146892.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron paramagnetic resonance (EPR)
    macerals
    two-temperature EPR measurement
    Opis:
    Two-temperature electron paramagnetic resonance (EPR) measurements, applied to determine the relative contributions of paramagnetic centers – fulfilling and not-fulfilling the Curie law, were carried out. The measurements were made on the macerals – exinite and vitrinite, separated from clarain of the Polish medium- -rank coal (85.6 wt% C). The two-temperature EPR measurements, presented in this work, were performed respectively, at temperatures: T1 = 293 K and T2 = 173 K for exinite, and T1 = 293 K and T2 = 153 K for vitrinite. The relative contributions X of spins not-fulfilling the Curie law present in the studied macerals were calculated. A comparison of different methods of calculating the relative contributions of paramagnetic centers – fulfilling and not-fulfilling the Curie law, present in exinite and vitrinite studied by EPR was made.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 389-393
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A generalized thermoelastic medium subjected to pulsed laser heating via a two-temperature model
    Autorzy:
    Abouelregal, Ahmed E.
    Zenkour, Ashraf M.
    Powiązania:
    https://bibliotekanauki.pl/articles/949139.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    two-temperature model
    thermoelasticity
    non-Gaussian laser pulse
    laser intensity
    Opis:
    This article investigates stress and induced temperature in an isotropic, homogeneous, thermoelastic half-space using a two-temperature generalized thermoelasticity model. The bounding plane surface of the present half-space continuum is subjected to a non-Gaussian laser pulse. Laplace’s transform space is considered to deduce a closed-form solution to the problem. In addition, the inversions of Laplace’s transformations have been carried numerically to obtain field quantities in the transient state. The effects of parameters of two-temperature, laser-pulse and laser intensity are investigated. A concluding remark for the graphical forms of the derived expressions is presented.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 631-639
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-temperature theory for a heated semi-infinite solid by a pulsed laser radiation
    Autorzy:
    Zenkour, Ashraf M.
    Abouelregal, Ahmed E.
    Powiązania:
    https://bibliotekanauki.pl/articles/240137.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelasticity
    two-temperature
    non-Gaussian laser pulse
    laser intensity
    phase lags
    Opis:
    In this paper, the two-temperature thermoelasticity model is proposed to a specific problem of a thermoelastic semi-infinite solid. The bounding plane surface of the semi-infinite solid is considered to be under a non-Gaussian laser pulse. Generalized thermoelasticity analysis with dual-phase-lags is taken into account to solve the present problem. Laplace transform and its inversion techniques are applied and an analytical solution as well as its numerical outputs of the field variables are obtained. The coupled theory and other generalized theory with one relaxation time may be derived as special cases. Comparison examples have been made to show the effect of dual-phase-lags, temperature discrepancy, laser-pulse and laser intensity parameters on all felids. An additional comparison is also made with the theory of thermoelasticity at a single temperature.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 2; 85-101
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of ultrashort laser pulse interactions with metal films using a two-temperature model
    Autorzy:
    Majchrzak, E.
    Dziatkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/122931.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    microscale heat transfer
    two-temperature model
    finite difference method
    mikroskalowy przepływ ciepła
    dwu-temperaturowy model
    metoda różnic skończonych
    Opis:
    In the paper the problem of thin metal film subjected to the action of the high laser fluence and the ultrashort pulse width is considered. The mathematical model consists of the equations describing the electrons and phonons temperatures and the relationships between the heat fluxes and temperature gradients of electrons and phonons. The problem is solved using the explicit scheme of the finite difference method with staggered grid. In the final part the results of computations and conclusions are presented.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 2; 31-39
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of diffusion and internal heat source on a two-temperature thermoelastic medium with three-phase-lag model
    Autorzy:
    Othman, M. I.
    Said, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240881.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diffusion
    Green-Naghdi theory
    internal heat source
    three-phase-lag model
    two-temperature
    dyfuzja
    teoria Greena-Naghdiego
    źródło ciepła
    Opis:
    The purpose of this paper is to depict the effect of diffusion and internal heat source on a two-temperature magneto-thermoelastic medium. The effect of magnetic field on two-temperature thermoelastic medium within the three-phase-lag model and Green-Naghdi theory without energy dissipation i discussed. The analytical method used to obtain the formula of the physical quantities is the normal mode analysis. Numerical results for the field quantities given in the physical domain are illustrated on the graphs. Comparisons are made with results of the two models with and without diffusion as well as the internal heat source and in the absence and presence of a magnetic field.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 2; 15-39
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of thermophysical parameters using an artificial immune system
    Autorzy:
    Dziatkiewicz, Jolanta
    Poteralski, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/38705313.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    microscale heat transfer
    two-temperature model
    final difference method
    artificial immune system
    mikroskalowy przepływ ciepła
    model dwutemperaturowy
    metoda różnic końcowych
    sztuczny układ odpornościowy
    Opis:
    In this paper, the identification of thermophysical parameters using the hyperbolic twotemperature model is made. We investigate the influence of ultra-fast laser pulses on the heating of a thin metal film using this model. Two differential equations coupled with the electron-phonon coupling factor G are used. One of these equations concerns electron temperatures and the other addresses lattice temperatures. Appropriate initial and boundary conditions are imposed for this model. The finite difference method with a staggered grid is used to solve this direct problem. Temperatures for even nodes and heat fluxes for odd nodes are calculated. The results of the direct problem and results of the experiment are compared. In the optimization process, an artificial immune system is used.
    Źródło:
    Computer Assisted Methods in Engineering and Science; 2023, 30, 4; 521-537
    2299-3649
    Pojawia się w:
    Computer Assisted Methods in Engineering and Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of pulsed laser radiation on a thermoviscoelastic semi-infinite solid under two-temperature theory
    Autorzy:
    Othman, M. I.
    Abouelregal, A. E. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/240353.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    generalized thermo-visco-elasticity
    two-temperature
    Non-Gaussian laser pulse
    laser intensity
    phase lags
    Kelvin-Voigt model
    termolepkosprężystość
    dwustopniowy
    niegaussowski impuls laserowy
    intensywność lasera
    model Kelvina-Voigta
    Opis:
    The purpose of this paper is to study the thermoviscoelastic interactions in a homogeneous, isotropic semi-infinite solid under two-temperature theory with heat source. The Kelvin-Voigt model of linear viscoelasticity which describes the viscoelastic nature of the material is used. The bounding plane surface of the medium is subjected to a non-Gaussian laser pulse. The generalized thermoelasticity theory with dual phase lags model is used to solve this problem. Laplace transform technique is used to obtain the general solution for a suitable set of boundary conditions. Some comparisons have been shown in figures to estimate the effects of the phase lags, viscosity, temperature discrepancy, laser-pulse and the laser intensity parameters on all the studied fields. A comparison was also made with the results obtained in the case of one temperature thermoelasticity theory.
    Źródło:
    Archives of Thermodynamics; 2017, 38, 3; 77-99
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Korelacje między wybranymi parametrami powietrza i ziarna kukurydzy suszonego metodą niskotemperaturową
    Corelation between chosen parameters of air and maize grain dried with low-temperature method
    Autorzy:
    Gawrysiak-Witulska, M.
    Ryniecki, A.
    Wawrzyniak, J.
    Mocek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/290688.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    suszenie niskotemperaturowe
    suszenie dwuetapowe
    kukurydza
    konserwacja pożniwna
    low-temperature drying
    two-stage drying
    maize
    vacuum preservation
    Opis:
    Celem badań była analiza niskotemperaturowego suszenia ziarna kukurydzy podczas suszenia dwuetapowego oraz ustalenie współczynników korelacji między temperaturą i wilgotnością względną powietrza w warstwach masy ziarna a wilgotnością kukurydzy podczas trwania procesu. Znalezienie największych współczynników korelacji między badanymi wielkościami fizycznymi ma w konsekwencji umożliwić opracowanie algorytmu automatycznej identyfikacji zakończenia suszenia. Badania prowadzono w specjalnie zbudowanym stanowisku laboratoryjnym umożliwiającym dwuetapowe suszenie ziarna kukurydzy. Wykazano, że opracowanie algorytmu automatycznej identyfikacji zakończenia suszenia umożliwi silna korelacja między zmianami wilgotności względnej powietrza w warstwie wylotowej dla powietrza suszącego a zmianami zawartości wody w górnej warstwie.
    The aim of the research was an analysis of low-temperature drying of maize grain during two-stage drying and determination of correlation coefficients between temperature and relative humidity of air in grain mass layers and moistness of maize during the process. Determination of the highest correlation coefficients between researched physical values is to enable to formulate an algorithm for automatic identification of the end of drying. The research was done in a laboratory station, built for this purpose, allowing a two-stage drying of maize grain. It was proved that development of an algorithm for automatic identification of the end of drying will be allowed thanks to a strong correlation between changes of relative humidity of air in the outlet layer for drying air and changes of water content in the upper layer.
    Źródło:
    Inżynieria Rolnicza; 2006, R. 10, nr 7(82), 7(82); 163-171
    1429-7264
    Pojawia się w:
    Inżynieria Rolnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variation of the cold intermediate water in the Black Sea exit of the Strait of Istanbul (Bosphorus) and its transfer through the strait
    Autorzy:
    Altiok, H.
    Sur, H.I.
    Yuce, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/48091.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Istanbul Strait
    monthly variation
    intermediate water
    seasonal thermocline
    temperature
    Black Sea
    Marmara Sea
    two-layer flow system
    saline water
    Opis:
    The cold intermediate water (CIW, T<8◦C) entering the Strait of Istanbul and its variation along the strait have been studied by using monthly conductivitytemperature- depth (CTD) data sets collected during the period from 1996 to 2000. In the northern exit of the strait, CIW is located between the seasonal thermocline and Mediterranean water originating from the lower layer of the Sea of Marmara. The thickness of CIW decreases from April to October. In the Strait of Istanbul, CIW is observed as a layer of temperature <14◦C. The thickness of this modified cold intermediate water flowing southwards with the upper layer decreases, while its temperature increases along the strait due to mixing with adjacent water. In the southern exit of the strait, the modified cold intermediate water is observed during the period from May to October. If CIW exists in the Black Sea exit region of the strait, modified cold water is found in the Marmara exit region during the same period. The distribution of CIW in the Strait of Istanbul contributes to our understanding of the dynamics of the strait, especially in the summer months.
    Źródło:
    Oceanologia; 2012, 54, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal fracture characteristics of an interface crack subjected to temperature variations
    Autorzy:
    Kalinović, Saša M.
    Djoković, Jelena M.
    Nikolić, Ružica R.
    Hadzima, Branislav
    Powiązania:
    https://bibliotekanauki.pl/articles/1839517.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    interface crack
    two-layered sample
    temperature variation
    fracture properties
    LEFM concept
    pęknięcia
    próba dwuwarstwowa
    wahania temperatury
    właściwości pękania
    koncepcja LEFM
    Opis:
    Thermal fracture characteristics - the thermal energy release rate and thermal stress intensity factor of a semi-infinite crack at an interface between the two elastic isotropic materials, subjected to the temperature variations, are considered in this paper. Those characteristics are determined based on application of the linear elastic fracture mechanics (LEFM) concept. Expressions for obtained theoretical solutions are compared to solutions from literature and they are found to be more concise. Influence of the materials change on these two thermal fracture properties were observed, as well as the influence of the thickness ratio of the two layers constituting the interface.
    Źródło:
    Production Engineering Archives; 2020, 26, 2; 54-59
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effects of climate change on photovoltaic solar production in hot regions
    Autorzy:
    Al-Baghdadi, Maher A. R. Sadiq
    Ridha, Amel A.
    Al-Khayyat, Ali Salam
    Powiązania:
    https://bibliotekanauki.pl/articles/2096200.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    PV cell temperature
    PV cell performance
    climate change
    hot regions
    two axis tracking
    energia słoneczna
    fotowoltaika
    zmiana klimatu
    dwuosiowy system nadążający
    Opis:
    The work of solar cells and their production of electrical energy have been affected by climate change, especially in hot regions which became significantly hotter and still receive relatively high levels of solar radiation throughout the year. Higher ambient temperature and solar radiation result in higher PV cell temperature and, therefore, the reduction in PV module power output and efficiency. This study investigates how a PV module performs throughout the year in a hot region by considering the variations in cell temperature resulting from changes in ambient temperature and solar radiation every day. The tilt angles and two-axis tracking have also been examined. Results indicate that the two-axis solar tracking system is critical to use in hot regions for obtaining higher output power. Therefore, part of this power can be used to cool solar panels using various methods to keep their efficiency high, such as operating air fans or operating pumps to cool them with coolant.
    Źródło:
    Diagnostyka; 2022, 23, 3; art. no. 2022303
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance characteristics of low global warming potential R134a alternative refrigerants in ejector-expansion refrigeration system
    Autorzy:
    Mishra, S.
    Sarkar, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240184.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eco-friendly refrigerant
    two-phase ejector
    optimization
    COP
    area ratio
    critical temperature
    ekologiczny czynnik chłodniczy
    strumienica dwufazowa
    optymalizacja
    stosunek powierzchni
    temperatura krytyczna
    Opis:
    Performance assessment of ejector-expansion vapor compression refrigeration system with eco-friendly R134a alternative refrigerants (R152a, R1234yf, R600a, R600, R290, R161, R32, and propylene) is presented for air-conditioning application. Ejector has been modeled by considering experimental data based correlations of component efficiencies to take care of all irreversibilities. Ejector area ratio has been optimized based on maximum coefficient of performance (COP) for typical air-conditioner operating temperatures. Selected refrigerants have been compared based on area ratio, pressure lift ratio, entrainment ratio, COP, COP improvement and volumetric cooling capacity. Effects of normal boiling point and critical point on the performances have been studied as well. Using ejector as an expansion device, maximum improvement in COP is noted in R1234yf (10.1%), which reduces the COP deviation with R134a (4.5% less in basic cycle and 2.5% less in ejector cycle). Hence, R1234yf seems to be best alternative for ejector expansion system due to its mild flammability and comparable volumetric capacity and cooling COP. refrigerant R161 is superior to R134a in terms of both COP and volumetric cooling capacity, although may be restricted for low capacity application due to its flammability.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 4; 55-72
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of flame temperature and soot amount for effective NOx and PM reduction in a heavy duty diesel engine
    Autorzy:
    Aoyagi, Yuzo
    Powiązania:
    https://bibliotekanauki.pl/articles/132846.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    Diesel engine
    exhaust emissions
    NOx
    PM
    EGR
    BSFC
    flame temperature
    two-color method
    video camera
    silnik Diesla
    emisje spalin
    temperatura płomienia
    metoda dwubarwowa
    kamera wideo
    Opis:
    To reduce exhaust NOx and smoke, it is important to measure flame temperature and soot amount in combustion chamber. In diesel combustion it is effective to use the two-color method for the measurement of the flame temperature and KL factor, which is related with soot concentration. The diesel flame was directly and continuously observed from the combustion chamber at running engine condition by using a bore scope and a high-speed video camera. The experimental single cylinder engine has 2.0-liter displacement and has the ability with up to five times of the boost pressure than the naturally aspirated engine by external super-charger. The devices of High Boost, Wide Range and High EGR rate at keeping a relatively high excess air ratio were installed in this research engine in order to reduce exhaust NOx emission without smoke deterioration from diesel engines. The video camera nac GX-1 was used in this study. From observed data under the changing EGR rates, the flame temperature and KL factor were obtained by the software of two-color method analysis. The diesel combustion processes are understood well by analyzing high-speed movies of the diesel flame motion and its temperature. The NOx and smoke are mutually related to maximum flame temperature and also it is possible to reduce simultaneously both NOx and soot emissions by high EGR rate in a single cylinder diesel engine.
    Źródło:
    Combustion Engines; 2019, 58, 4; 32-39
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Temperature Field, Heat and Fluid Flow of Two-Phase Zone Continuous Casting Cu–Sn Alloy Wire
    Autorzy:
    Luo, J.
    Liu, X.
    Wang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/380230.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    continuous casting
    two-phase zone continuous casting
    alloy Cu-Sn
    numerical simulation
    temperature field
    heat flow
    fluid flow
    odlewanie ciągłe
    strefa odlewania dwufazowego
    stop Cu-Sn
    symulacja numeryczna
    pole temperatury
    przepływ ciepła
    przepływ płynu
    Opis:
    Cu–4.7 wt. % Sn alloy wire with Ø10 mm was prepared by two-phase zone continuous casting technology, and the temperature field, heat and fluid flow were investigated by the numerical simulated method. As the melting temperature, mold temperature, continuous casting speed and cooling water temperature is 1200°C, 1040°C, 20 mm/min and 18°C, respectively, the alloy temperature in the mold is in the range of 720°C–1081°C, and the solid/liquid interface is in the mold. In the center of the mold, the heat flow direction is vertically downward. At the upper wall of the mold, the heat flow direction is obliquely downward and deflects toward the mold, and at the lower wall of the mold, the heat flow deflects toward the alloy. There is a complex circular flow in the mold. Liquid alloy flows downward along the wall of the mold and flows upward in the center.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 33-40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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