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    Wyświetlanie 1-15 z 15
    Tytuł:
    Numerical research of the viscous effect of the bilge keel on the damping moment
    Autorzy:
    Deng, R.
    Duan, W.
    Ma, S.
    Ma, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/258868.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    calculation model
    viscous code
    phase difference
    damping mpment
    bilge keel
    Opis:
    Bilge keels are effective passive devices in mitigating the rolling motion, and the usage of them covers almost all the sea going vessels. This paper focuses on the viscous effect of the bilge keel, ignored the effect of the free surface and the effect of the ship hull, for the general viscous characteristic of the bilge keel. In order to investigate the viscous effect of the bilge keel on the total damping moment, a special 2 dimensional numerical model, which includes a submerged cylinder with and without bilge keels, is designed for the simulation of forced rolling. Three important factors such as bilge keels width, rolling periods, as well as maximal rolling angles are taken into account, and the viscous flow field around the cylinder is simulated by some codes based on the viscous method in different conditions, in which the three factors are coupled. Verification and validation based on the ITTC method are performed for the cylinder without bilge keels in the conditions of different rolling periods and maximal rolling angles. The primary calculation of damping moment induced by the cylinder with 0mm, 4mm, and 10mm width bilge keels shows some interesting results, and a systematic analysis is conducted. The analysis of the damping moment components suggests there is phase difference between the damping moment induced by the cylinder and the bilge keels, and when the bilge keels width reaches a special size, the total damping moment is mitigated. The calculation of the damping moments induced by the cylinder with some larger bilge keels are also performed, and the results suggest that, the damping moment induced by the bilge keels is increased rapidly and becomes the dominant part in the total damping moment while the width of the bilge keels are increased, but the damping moment induced by the cylinder is not changed significantly. Some illustration of the vortices formation and shedding is included, which is the mechanism of the damping moment caused by the bilge keels. The present work shows an interesting problem, and it is useful for the bilge keel design.
    Źródło:
    Polish Maritime Research; 2015, S 1; 67-74
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements of Concentration differences between Liquid Mixtures using Digital Holographic Interferometry
    Autorzy:
    Guerrero-Méndez, C.
    Saucedo-Anaya, T.
    Araiza-Esquivel, M.
    Balderas-Navarro, R. E.
    López-Martínez, A.
    Olvera-Olvera, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/221594.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Digital Holographic Interferometry
    refractive index measurements
    phase difference
    full-field measurements
    Opis:
    We present an alternative method to detect and measure the concentration changes in liquid solutions. The method uses Digital Holographic Interferometry (DHI) and is based on measuring refractive index variations. The first hologram is recorded when a wavefront from light comes across an ordinary cylindrical glass container filled with a liquid solution. The second hologram is recorded after slight changing the liquid’s concentration. Differences in phase obtained from the correlation of the first hologram with the second one provide information about the refractive index variation, which is directly related to the changes in physical properties related to the concentration. The method can be used − with high sensitivity, accuracy, and speed − either to detect adulterations or to measure a slight change of concentration in the order of 0.001 moles which is equivalent to a difference of 0.003 g of sodium chloride in solutions. The method also enables to measure and calculate the phase difference among each pixel of two samples. This makes it possible to generate a global measurement of the phase difference of the entire sensed region.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 1; 19-26
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Uncertainty of Phase Difference Determination in Presence of Bias
    Autorzy:
    Saranovac, L. V.
    Vučijak, N. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221324.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sinusoidal electrical signals
    phase difference
    bias
    uncertainty of measurement
    MSAL algorithm
    Opis:
    Determination of the phase difference between two sinusoidal signals with noise components using samples of these signals is of interest in many measurement systems. The samples of signals are processed by one of many algorithms, such as 7PSF, UQDE and MSAL, to determine the phase difference. The phase difference result must be accompanied with estimation of the measurement uncertainty. The following issues are covered in this paper: the MSAL algorithm background, the ways of treating the bias influence on the phase difference result, comparison of results obtained by applying MSAL and the other mentioned algorithms to the same real signal samples, and evaluation of the uncertainty of the phase difference.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 4; 603-614
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat flux formulation for 1D dual-phase lag equation
    Autorzy:
    Majchrzak, E.
    Kałuża, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/122784.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    dual phase lag equation
    finite difference method
    thin metal film
    Opis:
    The thin metal film subjected to the ultra-short laser pulse is analyzed. Heat transfer processes occurring in the domain considered are described by the dual-phase lag model in which the unknown is the heat flux, not, as usual, temperature. This approach is especially convenient in the case of Neumann boundary conditions, which are taken into account here. The mathematical model supplemented by initial conditions is solved using the explicit scheme of finite difference method. In the final part of the paper the examples of computations are shown and the conclusions are formulated.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 1; 71-78
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implicit scheme of the finite difference method for the second-order dual phase lag equation
    Autorzy:
    Majchrzak, E.
    Mochnacki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/280549.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    microscale heat transfer
    dual phase lag model
    implicit scheme of finite difference method
    Opis:
    The second-order dual phase lag equation (DPLE) as a mathematical model of the microscale heat transfer is considered. It is known that the starting point determining the final form of this equation is the generalized Fourier law in which two positive constants (the relaxation and thermalization times) appear. Depending on the order of the generalized Fourier law expansion into the Taylor series, different forms of the DPLE can be obtained. As an example of the problem described by the second-order DPLE equation, thermal processes proceeding in the domain of a thin metal film subjected to a laser pulse are considered. The numerical algorithm is based on an implicit scheme of the finite difference method. At the stage of numerical modeling, the first, second and mixed order of the dual phase lag equation are considered. In the final part of the paper, examples of different solutions are presented and conclusions are formulated.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 2; 393-402
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Workflow of Ground Penetrating Radar Data Analysis Based on Maximum Energy Difference Steering
    Przebieg pracy z danymi radarowymi penetrującymi ziemię Analiza oparta na sterowaniu maksymalną różnicą energii
    Autorzy:
    Dang, Duy Hoang
    Le, Cuong Van Anh
    Nguyen, Thuan Van
    Nguyen, Long Quoc
    Huynh, Nhan Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/28756746.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    ground penetrating radar
    phase analysis
    energy difference
    radar penetrujący podłoże
    analiza fazowa
    różnica energii
    Opis:
    Ground Penetrating Radar is commonly used in civil engineering sectors. Underground anomalies (i.e., electric wires, water pipes or sinkholes) can be detected through representations of hyperbolae in the measured processed GPR image. Our work focuses on detecting the underground objects and understanding their metallic or nonmetallic characteristics. The max energy difference attribute is applied to illuminate their positions while phase analysis process can determine change of phase spectrum in the diffracted signals. For improving phase analysis, we applied a novel workflow combining conventional processed steps and a zooming step for preserving phase originality without disturbed by any unnecessary filters. We applied the workflow in model and real data for proving its effectiveness. Interpretation of two real datasets in Vietnam by our workflow can express existences of the artificial underground anomalies as well as their matter characteristics comparing to their surrounding environments.
    Ground Penetrating Radar jest powszechnie stosowany w inżynierii lądowej i wodnej. Podziemne anomalie (np. przewody elektryczne, rury wodociągowe lub zapadliska) można wykryć za pomocą reprezentacji hiperbol w zmierzonym przetworzonym obrazie GPR. Nasza praca koncentruje się na wykrywaniu podziemnych obiektów i zrozumieniu ich metalicznych lub niemetalicznych wła-ściwości. Atrybut maksymalnej różnicy energii jest stosowany do oświetlania ich pozycji, podczas gdy proces analizy fazowej może określić zmianę widma fazowego w dyfrakcyjnych sygnałach. Aby usprawnić analizę fazową, zastosowaliśmy nowatorski przepływ pracy łączący konwencjonalne kroki przetwarzania i krok powiększania w celu zachowania oryginalności fazy bez zakłócania przez niepotrzebne filtry. Zastosowaliśmy przepływ pracy w modelu i rzeczywistych danych, aby udowodnić jego skuteczność. Interpretacja dwóch rzeczywistych zbiorów danych w Wietnamie za pomocą naszego przepływu pracy może wyrazić istnienie sztucznych anomalii podziemnych, a także ich charakterystykę materii w porównaniu z otaczającym je środowiskiem.
    Źródło:
    Inżynieria Mineralna; 2023, 1; 195--202
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isotope effects on vapor phase 2nd virial coefficients
    Autorzy:
    Van Hook, W.
    Rebelo, L.
    Wolfsberg, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146957.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    isotope effects
    Lennard-Jones potential
    reduced partition function ratio
    vapor phase
    vapor pressure isotopic difference
    virial coefficients
    Opis:
    Vapor phase 2nd virial coefficient isotope effects (VCIE's) are interpreted. A useful correlation is developed between -Delta(Beta-bo)/(Beta-bo) = (-VCIE) and the reference condensed phase reduced isotopic partition function ratio [ln(fc/fg)]*. B is the second virial coefficient, bo = 2pi sigma3/3, sigma is the Lennard-Jones size parameter, and Delta is an isotopic difference, light-heavy. [ln(fc/fg)]* can be obtained from vapor pressure isotope effects for T/TCRITICAL < 0.7. Also (-VCIE) = ln(fp/fg 2), where ln(fp/fg 2) is the reduced isotopic partition function ratio describing the equilibrium between monomers and interacting pairs. At temperatures well removed from crossovers in ln(fp/fg 2) or [ln(fc/fg)]*, ln(fp/fg 2) = (0.4š0.2) [ln(fc/fg)]*.
    Źródło:
    Nukleonika; 2002, 47,suppl.1; 47-51
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability analysis for discrete-time fractional-order LTI state-space systems. Part II: New stability criterion for FD-based systems
    Autorzy:
    Stanisławski, R.
    Latawiec, K. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200325.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Grünwald-Letnikov fractional difference
    discrete-time fractional order system
    stability criterion
    non-minimum phase system
    closed loop stability
    Opis:
    This paper presents a series of new results on the asymptotic stability of discrete-time fractional difference (FD) state space systems and their finite-memory approximations called finite FD (FFD) and normalized FFD (NFFD) systems. In Part I of the paper, new necessary and sufficient stability conditions have been given in a unified form for FD, FFD and NFFD-based systems. Part II offers a new, simple, ultimate stability criterion for FD-based systems. This gives rise to the introduction of new definitions of the so-called f-poles and f-zeros for FD-based systems, which are used in the closed-loop stability analysis for FD-based systems and, approximately, for FFD/NFFD-based ones.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 363-370
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    1D generalized dual-phase lag equation. Sensitivity analysis with respect to the porosity
    Autorzy:
    Kałuża, G.
    Majchrzak, E.
    Turchan, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/123000.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    bioheat transfer
    generalized dual-phase lag model
    sensitivity analysis
    finite difference method
    przepływ biociepła
    metoda różnic skończonych
    analiza wrażliwości
    Opis:
    Thermal processes occurring in the heated tissue are described by the 1D generalized dual-phase lag equation supplemented by appropriate boundary and initial conditions. Using the sensitivity analysis method, the additional problem connected with the porosity is formulated. Both problems are solved by means of the explicit scheme of the finite difference method. In this way it is possible to estimate the temperature changes due to the perturbation of porosity. In the final part of the paper, the example of computation is shown and the conclusions are formulated.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 1; 49-58
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of biological tissue heating using the dual-phase lag equation with temperature – dependent parameters
    Autorzy:
    Majchrzak, Ewa
    Stryczyński, Mikołaj
    Powiązania:
    https://bibliotekanauki.pl/articles/2202034.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    bioheat transfer
    dual-phase lag model
    temperature-dependent parameter
    finite difference method
    przepływ biociepła
    model dwufazowego opóźnienia
    metoda różnic skończonych
    Opis:
    The dual-phase lag equation is formulated for the case when the thermophysical parameters occurring in this equation are temperature-dependent. The axial-symmetrical domain of biological tissue heated by an external heat source is considered. The problem is solved using the implicit scheme of the finite difference method. At the stage of numerical computations, the analytical relationships taken from the literature describing changes in parameters are taken into account.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 3; 85--98
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dual-phase lag equation. Stability conditions of a numerical algorithm based on the explicit scheme of the finite difference method
    Autorzy:
    Majchrzak, E.
    Mochnacki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/122742.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    heat conduction
    dual-phase lag equation
    finite difference method
    stability conditions of FDM explicit scheme
    przewodzenie ciepła
    metoda różnic skończonych
    Opis:
    The dual-phase lag equation (DPLE) is considered. This equation belongs to the group of hyperbolic PDE, contains a second order time derivative and higher order mixed derivative in both time and space. From the engineer’s point of view, the DPLE results from the generalized form of the Fourier law. It is applied as a mathematical model of thermal processes proceeding in the micro-scale and also in the case of bio-heat transfer problem analysis. At the stage of numerical computations the different approximate methods of the PDE solving can be used. In this paper, the authors present the considerations concerning the stability conditions of the explicit scheme of finite difference method (FDM). The appropriate conditions have been found using the von Neumann analysis. In the final part of the paper, the results of testing computations are shown.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 3; 89-96
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical approaches to the heat transfer problem in modern electronic structures
    Autorzy:
    Raszkowski, T.
    Samson, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/952934.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    nanoscale heat transfer
    Fourier-Kirchhoff equation
    dual-phase-lag equation
    finite difference method
    Runge-Kutta method
    gear’s method
    thermal analyses
    Opis:
    The main aim of this paper is to present a detailed description of the research related to the modeling of heat conduction in modern electronic structures, including special consideration for numerical aspects of analyzed algorithms. The motivation to undertake the research as well as some of the most-important results of the experiments and simulations are also included. Moreover, a numerical approximation of the problem as well as the methodology used and a sample solution of the mentioned problem are presented. In the main part, the discretization techniques, Ordinary Differential Equation algorithms, and simulation results for Runge-Kutta’s and Gear’s algorithms are analyzed and discussed. Additionally, a new effective approach to the modeling of heat transfer in electronic nanostructures is demonstrated.
    Źródło:
    Computer Science; 2017, 18 (1); 71-93
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of artificial hyperthermia treatment
    Analiza numeryczna zabiegu sztucznej hipertermii
    Autorzy:
    Turchan, Ł.
    Majchrzak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/408458.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    artificial hyperthermia
    finite difference method
    parallelized calculations
    dual phase lag model
    sztuczna hipertermia
    metoda różnic skończonych
    obliczenia równoległe
    uogólnione równanie z dwoma czasami opóźnień
    Opis:
    This paper presents numerical modelling of artificial hyperthermia treatment. Presented model takes into account not only the temperature distributions but also the thermal dose parameter. Obtaining of temperature distributions takes advantage of the generalized dual phase lag equation. For computer calculations the parallelized algorithm was prepared.
    Artykuł dotyczy numerycznego modelowania zabiegu sztucznej hipertermii. Analiza skuteczności zabiegu jest rozpatrywana nie tylko na podstawie czasoprzestrzennych rozkładów temperatury, ale także w oparciu o parametr dawki termicznej. Do modelowania przepływu ciepła w rozpatrywanym obszarze wykorzystano uogólnione równanie z dwoma czasami opóźnień. Na potrzeby obliczeń numerycznych napisano autorski program oparty o obliczenia równoległe.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2014, 1; 48-53
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of heat transfer phenomena for two different cryopreservation methods : slow freezing and vitrification
    Autorzy:
    Skorupa, Anna
    Piasecka-Belkhayat, Alicja
    Powiązania:
    https://bibliotekanauki.pl/articles/2202057.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    cryopreservation
    slow freezing
    vitrification
    phase change
    finite difference method
    directed interval arithmetic
    kriokonserwacja
    powolne zamrażanie
    witryfikacja
    przemiana fazowa
    metoda różnic skończonych
    arytmetyka przedziałów skierowanych
    Opis:
    The purpose of the research is to prepare a mathematical and numerical model for the phenomenon of heat transfer during cryopreservation. In the paper, two popular methods, slow freezing and vitrification, are compared. Furthermore, the basic model of thermal processes is supplemented by the phenomenon of phase transitions. To determine the temperature distribution during cryopreservation processes, one uses the heat transfer equation proposed by Pennes. An integral part of the energy equation is the substitute thermal capacity (STC) performed according to the concept named one domain method (fixed domain method), The numerical model is developed using the finite difference method (FDM) connected with directed interval arithmetic. The final part of the article contains the results of numerical simulations.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2023, 22, 1; 57--69
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implicit scheme of the finite difference method for 1D dual-phase lag equation
    Autorzy:
    Majchrzak, E.
    Mochnacki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/973620.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    micro-scale heat conduction
    dual-phase lag equation
    finite difference method
    stability of FDM implicit scheme
    równanie z dwoma czasami opóźnień
    metoda różnic skończonych
    DPLE
    schemat FDM
    Opis:
    The 1D dual-phase lag equation (DPLE) is solved using the implicit FDM scheme. The dual phase lag equation is the hyperbolic PDE and contains a second order time derivative and higher order mixed derivative in both time and space. The DPLE results from the generalization of the well known Fourier law in which the delay times are taken into account. So, in the equation discussed, two positive parameters appear. They correspond to the relaxation time τq and the thermalization time τ T. The DPLE finds, among others, the application as the mathematical description of the thermal processes proceeding in the micro-scale. In the paper, the numerical solution of DPLE based on the implicit scheme of the FDM is presented. The authors show that a such an approach in the case of DPLE leads to the unconditionally stable differential scheme.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 3; 37-46
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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