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    Wyświetlanie 1-47 z 47
    Tytuł:
    Approximate solution of painlevé equation i by natural decomposition method and laplace decomposition method
    Autorzy:
    Amir, Muhammad
    Haider, Jamil Abbase
    Ahmad, Shahbaz
    Ashraf, Asifa
    Gul, Sana
    Powiązania:
    https://bibliotekanauki.pl/articles/2233067.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    natural decomposition method
    Laplace decomposition method
    series solution
    Adomain polynomial
    Painlevéequation
    Opis:
    The Painlevé equations and their solutions occur in some areas of theoretical physics, pure and applied mathematics. This paper applies natural decomposition method (NDM) and Laplace decomposition method (LDM) to solve the second-order Painlevé equation. These methods are based on the Adomain polynomial to find the non-linear term in the differential equation. The approximate solution of Painlevé equations is determined in the series form, and recursive relation is used to calculate the remaining components. The results are compared with the existing numerical solutions in the literature to demonstrate the efficiency and validity of the proposed methods. Using these methods, we can properly handle a class of non-linear partial differential equations (NLPDEs) simply. Novelty: One of the key novelties of the Painlevé equations is their remarkable property of having only movable singularities, which means that their solutions do not have any singularities that are fixed in position. This property makes the Painlevé equations particularly useful in the study of non-linear systems, as it allows for the construction of exact solutions in certain cases. Another important feature of the Painlevé equations is their appearance in diverse fields such as statistical mechanics, random matrix theory and soliton theory. This has led to a wide range of applications, including the study of random processes, the dynamics of fluids and the behaviour of non-linear waves.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 3; 417--422
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An influence matrix technique for multi-domain solution of the Navier-Stokes equations in a vorticity-streamfunction formulation
    Zastosowanie metody macierzy wpływu w połączeniu z metodą dekompozycji obszaru obliczeniowego do rozwiązania równań Naviera-Stokesa sformułowanych w postaci wirowość-funkcja prądu
    Autorzy:
    Bogusławski, A.
    Kubacki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/280218.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    spectral methods
    domain decomposition method
    influence matrix technique
    Opis:
    The paper presents new multi-domain algorithms based on the influence matrix technique applied together with the non-overlapping iterative domain decomposition method for solution of the incompressible Navier- Stokes equations in vorticity-streamfunction formulation. The spectral Chebyshev collocation method and the influence matrix algorithm are applied for solution of the Stokes problem in each subdomain resulting from time discretization of the Navier-Stokes equations, while the patching conditions (continuity of the solution and continuity of its first order derivative) at the interfaces between subdomains are satisfied using the iterative domain decomposition algorithm.
    W pracy przedstawiono nowy iteracyjny algorytm dekompozycji obszaru obliczeniowego oparty na metodzie macierzy wpływu w zastosowaniu do równań Naviera- -Stokesa dla przepływu czynnika nieściśliwego w sformułowaniu wirowość-funkcja prądu. Spektralna metoda kolokacji wykorzystująca szeregi wielomianów Czebyszewa oraz metoda macierzy wpływu została zastosowana do rozwiązania zagadnienia Stokesa, będącego rezultatem dyskretyzacji równań Naviera-Stokesa w funkcji czasu, w każdym z podobszarów obszaru obliczeniowego, natomiast warunek ciągłości rozwiązania i jego pierwszej pochodnej na powierzchniach rozdziału pomiędzy podobszarami został uzyskany przy pomocy metody iteracyjnej.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2009, 47, 1; 17-40
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of heat transfer on thermal stresses in an annular hyperbolic fin: an approximate analytical solution
    Autorzy:
    Mallick, A.
    Ranjan, R.
    Sarkar, P. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/279437.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    thermal stresses
    Adomian decomposition method (ADM)
    variable thermal conductivity
    Opis:
    An approximate analytical solution is presented for thermal stresses in an annular convectiveconductive fin of a hyperbolic profile with temperature dependent thermal conductivity. The classical thermo-elasticity theory coupled with the ADM based polynomial form of temperature field is employed for an approximate analytical solution of thermal stresses. The influence of thermal parameters, i.e. variable thermal conductivity, the thermo-geometric parameter and the non-dimensional coefficient of thermal expansion on temperature and sttress fields are investigated. The results for the stress field obtained from the ADM based solution are compared with those available in literature and found to be in close agreement.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 437-448
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the blowing up solutions of the 4-d general q-Kuramoto-Sivashinsky equation with exponentially “dominated” nonlinearity and singular weight
    Autorzy:
    Baraket, Sami
    Mahdaoui, Safia
    Ouni, Taieb
    Powiązania:
    https://bibliotekanauki.pl/articles/29519212.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    singular limits
    Green’s function
    nonlinearity
    gradient
    nonlinear domain decomposition method
    Opis:
    Let Ω be a bounded domain in $ \mathbb{R}^4 $ with smooth boundary and let $ x^1, x^2, . . . , x^m $ be m-points in Ω. We are concerned with the problem $ \Delta^2 u - H(x, u, D^k u)=\rho^4 \prod_{i=1}^n | x - p_i |^{4 \alpha_i } f(x)g(u), $ where the principal term is the bi-Laplacian operator, $ H(x, u, D^k u)$ is a functional which grows with respect to $ Du $ at most like $ |Du|^q, 1 ≤ q ≤ 4, f : Ω → [0,+∞[ $ is a smooth function satisfying f(pi) > 0 for any i = 1, . . . , n, $ α_i $ are positives numbers and $ g : \mathbb{R} → [0,+∞[ $ satisfy $ |g(u)| ≤ ce^u $. In this paper, we give sufficient conditions for existence of a family of positive weak solutions $ (u_ρ)_{ρ>0} $ in Ω under Navier boundary conditions u = Δu = 0 on ∂Ω. The solutions we constructed are singular as the parameters ρ tends to 0, when the set of concentration $ S = {x^1, . . . , x^m} ⊂ Ω $ and the set $ Λ := {p_1, . . . , p_n} ⊂ Ω $ are not necessarily disjoint. The proof is mainly based on nonlinear domain decomposition method.
    Źródło:
    Opuscula Mathematica; 2023, 43, 1; 5-18
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dirichlet/Dirichlet and Dirichlet/Dirichlet-Neumann/Neumann non-overlapping iterative domain decomposition methods
    Autorzy:
    Kubacki, S.
    Bogusławski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933184.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska
    Tematy:
    non-overlapping domain decomposition method
    parallel computing
    spectral methods
    Helmholtz equation
    Opis:
    A new iterative non-overlapping domain decomposition method is proposed for solving the one- and two-dimensional Helmholtz equation on parallel computers. The spectral collocation method is applied to solve the Helmholtz equation in each subdomain based on the Chebyshev approximation, while the patching conditions are imposed at the interfaces between subdomains through a correction, being a linear function of the space coordinates. Convergence analysis is performed for two applications of the proposed method (DDLC and DDNNLC algorithms - the meaning of these abbreviations is explained below) based on the works of Zanolli and Funaro et al. Numerical tests have been performed and results obtained using the proposed method and other iterative algorithms have been compared. Parallel performance of the multi-domain algorithms has been analyzed by decomposing the two-dimensional domain into a number of subdomains in one spatial direction. For the one-dimensional problem, convergence of the iteration process was quickly obtained using the proposed method, setting a small value of the ? constant in the Helmholtz equation. Another application of the proposed method may be an alternative to other iterative schemes when solving the two-dimensional Helmholtz equation.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 1-2; 85-104
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dusty time fractional MHD flow of a Newtonian fluid through a cylindrical tube with a non-Darcian porous medium
    Autorzy:
    Imo-Mani-Singha, H.
    Sengupta, Sanjib
    Powiązania:
    https://bibliotekanauki.pl/articles/1839832.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    time-fractional order Navier-Stokes equation
    Laplace decomposition method
    LDM
    Magnetohydrodynamics
    MHD
    dusty flow
    non-Darcy porous medium
    ciecz newtonowska
    przepływ cieczy nienewtonowskiej
    Laplace Decomposition Method
    magnetohydrodynamika
    Opis:
    In this paper, time fractional flow of a Newtonian fluid through a uniform cylindrical tube with a non-Darcy porous medium in the presence of dust particles under the application of a uniform magnetic field along the meridian axis is discussed. The implication of time fractional order differential equations in flow problems and some benefits of fractional order differential equations are highlighted. The Laplace Decomposition Method (LDM) is used to obtain an approximate solution to the proposed problem. The impact of fractional order and integer order of the differential equations and also the effects of some important parameters on the flow system are shown in the forms of graphs and a table. The convergence test of the solution is done. It has been observed that the fractional order differential equation reveals more things like the decrease in dust particle velocity due to the increase in magnetic field for fractional order derivatives, whereas, no noticeable change in dust particle velocity due to the change in magnetic field for integer order derivatives are observed. Also, it is observed that an increase in a fractional order derivative decrease the fluid as well as the dust particle velocities. The skin friction at the walls of the tube are also highlighted.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 4; 101-114
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dusty time fractional MHD flow of a Newtonian fluid through a cylindrical tube with a non-Darcian porous medium
    Autorzy:
    Imo-Mani-Singha, H.
    Sengupta, Sanjib
    Powiązania:
    https://bibliotekanauki.pl/articles/1839728.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    time-fractional order Navier-Stokes equation
    Laplace decomposition method
    LDM
    Magnetohydrodynamics
    MHD
    dusty flow
    non-Darcy porous medium
    ciecz newtonowska
    przepływ cieczy nienewtonowskiej
    Laplace Decomposition Method
    magnetohydrodynamika
    Opis:
    In this paper, time fractional flow of a Newtonian fluid through a uniform cylindrical tube with a non-Darcy porous medium in the presence of dust particles under the application of a uniform magnetic field along the meridian axis is discussed. The implication of time fractional order differential equations in flow problems and some benefits of fractional order differential equations are highlighted. The Laplace Decomposition Method (LDM) is used to obtain an approximate solution to the proposed problem. The impact of fractional order and integer order of the differential equations and also the effects of some important parameters on the flow system are shown in the forms of graphs and a table. The convergence test of the solution is done. It has been observed that the fractional order differential equation reveals more things like the decrease in dust particle velocity due to the increase in magnetic field for fractional order derivatives, whereas, no noticeable change in dust particle velocity due to the change in magnetic field for integer order derivatives are observed. Also, it is observed that an increase in a fractional order derivative decrease the fluid as well as the dust particle velocities. The skin friction at the walls of the tube are also highlighted.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 4; 101-114
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stan zdrowia i umieralność jako determinanty procesu depopulacji – analiza na przykładzie województwa łódzkiego
    Health status and mortality as determinants of depopulation: a case study of Łódź Voivodeship
    Autorzy:
    Wróblewska, Wiktoria
    Powiązania:
    https://bibliotekanauki.pl/articles/694437.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    trwanie życia
    metoda dekompozycji
    województwo łódzkie
    life expectancy
    decomposition method
    Łódź Voivodeship
    Opis:
    The author have presented an assessment of health status and mortality data for the Łódź Voivodeship against these for the whole of Poland and the voivodeships with the highest life expectancy indicators. The analysis draws on decomposition of changes in life expectancy by sex and age group. This method allowed for the identification of those age groups in which changes in mortality had the greatest influence on the eо parameter level. The study is important for the Łódź Voivodeship depopulation problem, observed since many years.
    Praca dotyczy oceny stanu zdrowia i umieralności województwa łódzkiego na tle sytuacji ogólnopolskiej oraz województw o najlepszych wskaźnikach trwania życia. Do analizy wykorzystano metodę dekompozycji różnic w trwaniu życia według płci i grup wieku. Zastosowana metoda pozwoliła na identyfikację grup wieku, w których zmiany w umieralności miały największy wpływ na poziom parametru eо. Podjęte zagadnienie ma istotne znaczenie w świetle obserwowanej od lat depopulacji województwa łódzkiego.
    Źródło:
    Konwersatorium Wiedzy o Mieście; 2017, 30, 2; 81-86
    2543-9421
    2544-1221
    Pojawia się w:
    Konwersatorium Wiedzy o Mieście
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solution of the modified time fractional coupled burgers equations using laplace adomian decompostion method
    Autorzy:
    Omame, Andrew
    Zaman, Fiazud Din
    Powiązania:
    https://bibliotekanauki.pl/articles/2204660.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    Burgers equations
    fractional derivatives
    Laplace Adomian decomposition method
    semi-analytic solutions
    simulations
    Opis:
    In this work, a coupled system of time-fractional modified Burgers’ equations is considered. Three different fractional operators: Caputo, Caputo-Fabrizio and Atangana-Baleanu operators are implemented for the equations. Also, two different scenarios are examined for each fractional operator: when the initial conditions are u(x,y,0) = sin(xy), v(x,y,0) = sin(xy), and when they are u(x,y,0) = e{−kxy}, v(x,y,0) = e{−kxy}, where k,α are some positive constants. With the aid of computable Adomian polynomials, the solutions are obtained using Laplace Adomian decomposition method (LADM). The method does not need linearization, weak nonlinearity assumptions or perturbation theory. Simulations are also presented to support theoretical results, and the behaviour of the solutions under the three different fractional operators compared.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 1; 124--132
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decomposition versus Minimal Path and Cuts Methods for Reliability Evaluation of an Advanced Robotic Production System
    Autorzy:
    Shojaeifar, A.
    Fazlollahtabar, H.
    Mahdavi, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/385117.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    complex system reliability
    industrial robots
    decomposition method (DM)
    minimal paths and cuts method (MPCM) cone
    Opis:
    As complex systems have become global and essential in today’s society, their reliable design and the determination of their availability have turned into a very important task for managers and engineers. Industrial robots are examples of these complex systems that are being increasingly used for intelligent transportation, production and distribution of materials in warehouses and automated production lines. In this paper, two techniques of reliability evaluation are developed for a complex system of robots. Decomposition method and minimal path and cuts method are adapted for the proposed complex system. For practical implementation, a particular robot system is first modeled. Then, reliability block diagram is adopted to model the complex system for reliability evaluation purpose. Finally, the methods are implemented and their properties are discussed.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2016, 10, 3; 52-57
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MCPA decomposition method in soil matrix using ozone as an oxidant
    Metoda rozkładu MCPA w matrycy glebowej z użyciem ozonu jako utleniacza
    Autorzy:
    Balawejder, M.
    Antos, P.
    Jozefczyk, R.
    Pieniazek, M.
    Odzimek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/905746.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    2-methyl-4-chlorophenoxyacetic acid
    decomposition method
    soil matrix
    ozone
    oxidant
    soil contamination
    Opis:
    In presented research a method for remediation of MCPA contaminated soil based on the combination of fluidization process technique and ozone was utilized. Exposition of soil contaminated with MCPA at the concentration of 0,1 % w/w on the a mixture of air and ozone allowed for removal of over 90% of MCPA in form of MCPA 2-ethylhexanol-ester (MCPA 2-EHE) in laboratory conditions. The efficacy of the method was proven by GC-MS analysis of MCPA concentration profile during soil remediation procedure and by comparing of kinetic data, such as half life time, with the natural half life time of MCPA in the soil.
    Źródło:
    Polish Journal of Soil Science; 2014, 47, 2
    0079-2985
    Pojawia się w:
    Polish Journal of Soil Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solution of fractional heat-like and fractional wave-like equation by using modern strategy
    Autorzy:
    Mohamed, Zain El Abden
    Hamza, Amjad
    Elzaki, Tarig
    Algolam, Mohamed
    Elhussein, Shiraz
    Powiązania:
    https://bibliotekanauki.pl/articles/2233715.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    fractional-order wave-like equation
    fractional-order heat-like equation
    initial-boundary value problem
    Adomian decomposition method
    Opis:
    This paper introduces a novel form of the Adomian decomposition (ADM) method for solving fractional-order heat-like and wave-like equations with starting and boundary value problems. The derivations are provided in the sense of Caputo. In order to help understanding, the generalised formulation of the current approach is provided. Several numerical examples of fractional-order diffusion-wave equations (FDWEs) are solved using the suggested method in this context. In addition to examining the applicability of the suggested method to the solving of fractional-order heat-like and wave-like equations, a graphical depiction of the solutions to three instructive cases was constructed. Solution graphs were arrived at for integer and fractional-order problems. The derived and exact solutions to integer-order problems were found to be in excellent agreement. The subject of the present research endeavour is the convergence of fractional-order solutions. This strategy is considered to be the most successful way of addressing fractional-order initial-boundary value issues in science and engineering. This strategy is presented here.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 3; 372--380
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical solution of the time fractional Fokker-Planck equation
    Autorzy:
    Sutradhar, T.
    Datta, B. K.
    Bera, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/955129.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    równanie Fokkera-Plancka
    równania różniczkowe
    mechanika stosowana
    Fokker-Planck equation
    Adomian decomposition method
    fractional calculus
    fractional differential equation
    Opis:
    A nonperturbative approximate analytic solution is derived for the time fractional Fokker-Planck (F-P) equation by using Adomian’s Decomposition Method (ADM). The solution is expressed in terms of Mittag-Leffler function. The present method performs extremely well in terms of accuracy, efficiency and simplicity.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 435-440
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New iterative method of solving nonlinear equations in fluid mechanics
    Autorzy:
    Palivets, M.
    Andreev, E.
    Bakshtanin, A.
    Benin, D.
    Snezhko, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106452.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    trzęsienie ziemi
    mechanika płynów
    porowatość
    Adomian Decomposition Method ADM
    earthquake
    filtration
    fluid mechanics
    iterative method
    nonlinear fractional partial differential equations
    porous medium
    Opis:
    This paper presents the results of applying a new iterative method to linear and nonlinear fractional partial differential equations in fluid mechanics. A numerical analysis was performed to find an exact solution of the fractional wave equation and fractional Burgers’ equation, as well as an approximate solution of fractional KdV equation and fractional Boussinesq equation. Fractional derivatives of the order are described using Caputo's definition with 01<α≤ or 12<α≤. A comparative analysis of the results obtained using a new iterative method with those obtained by the Adomian decomposition method showed the first method to be more efficient and simple, providing accurate results in fewer computational operations. Given its flexibility and ability to solve nonlinear equations, the iterative method can be used to solve more complex linear and nonlinear fractional partial differential equations.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 163--176
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oddziaływanie terms of trade na wzrost gospodarczy w Polsce
    The impact of terms of trade on economic growth in Poland
    Autorzy:
    Marczewski, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/18104544.pdf
    Data publikacji:
    2023-01-13
    Wydawca:
    Szkoła Główna Handlowa w Warszawie. Kolegium Zarządzania i Finansów
    Tematy:
    terms of trade
    social welfare
    Törnqvist index
    decomposition method
    factors of economic growth
    dobrobyt społeczny
    indeks Törnqvista
    metoda dekompozycyjna
    czynniki wzrostu gospodarczego
    Opis:
    Znaczne zmiany terms of trade mają istotny wpływ na kształtowanie się salda obrotów handlu zagranicznego, strukturę podziału PKB oraz dobrobyt społeczny. W artykule rozpatrywany jest wpływ terms of trade na wzrost gospodarczy w Polsce w ujęciu dobrobytowym. Omówione zostały podstawy teoretyczne zagadnienia, proste wskaźniki pomiaru wpływu terms of trade na PKB oraz zastosowana w badaniu metoda dekompozycyjna U. Kohliego. W części empirycznej przedstawione zostały wyniki obliczeń, na tle innych czynników produkcji, oddziaływania terms of trade na tempo wzrostu gospodarczego Polski w latach 1995–2020. Stwierdzono wyraźnie pozytywny wkład terms of trade we wzrost w okresie po przystąpieniu Polski do Unii Europejskiej.
    The terms of trade have a significant impact on the balance of foreign trade turnover, the structure of GDP distribution, and social welfare. The article examines the impact of terms of trade on economic growth in Poland in welfare terms. The theoretical basis of the issue, simple indicators for measuring the impact of terms of trade on GDP, and the decomposition method of U. Kohli used in the study were discussed. The empirical part presents the results of calculations, compared to other factors of production, of the impact of terms of trade on the rate of Polish economic growth in the years 1995–2020. The clearly positive contribution of the terms of trade to growth in the period following Poland’s accession to the European Union was found.
    Źródło:
    Studia i Prace Kolegium Zarządzania i Finansów; 2022, 185; 9-21
    1234-8872
    2657-5620
    Pojawia się w:
    Studia i Prace Kolegium Zarządzania i Finansów
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new numerical technique for solving fractional Bratu’s initial value problems in the Caputo and Caputo-Fabrizio sense
    Autorzy:
    Khalouta, Ali
    Kadem, Abdelouahab
    Powiązania:
    https://bibliotekanauki.pl/articles/1839797.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    fractional Bratu’s initial value problem
    Caputo fractional derivative
    Caputo-Fabrizio fractional derivative
    natural transform method
    Adomian decomposition method
    ułamkowa pochodna Caputo
    ułamkowa pochodna Caputo-Fabrizio
    metoda transformacji naturalnej
    metoda dekompozycji Adomiana
    Opis:
    The purpose of this paper is to propose a new numerical technique called the natural decomposition method (NDM) for solving fractional Bratu’s initial value problems (FBIVP) in the Caputo and Caputo-Fabrizio sense. The NDM is a combined form of the natural transform method and the Adomian decomposition method. The numerical example is provided in order to validate the efficiency and reliability of the proposed method. The obtained results reveal that the proposed method is a very efficient and simple tool for solving fractional differential equations.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 1; 43-56
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new numerical technique for solving fractional Bratu’s initial value problems in the Caputo and Caputo-Fabrizio sense
    Autorzy:
    Khalouta, Ali
    Kadem, Abdelouahab
    Powiązania:
    https://bibliotekanauki.pl/articles/122619.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    fractional Bratu’s initial value problem
    Caputo fractional derivative
    Caputo-Fabrizio fractional derivative
    natural transform method
    Adomian decomposition method
    ułamkowa pochodna Caputo
    ułamkowa pochodna Caputo-Fabrizio
    metoda transformacji naturalnej
    metoda dekompozycji Adomiana
    Opis:
    The purpose of this paper is to propose a new numerical technique called the natural decomposition method (NDM) for solving fractional Bratu’s initial value problems (FBIVP) in the Caputo and Caputo-Fabrizio sense. The NDM is a combined form of the natural transform method and the Adomian decomposition method. The numerical example is provided in order to validate the efficiency and reliability of the proposed method. The obtained results reveal that the proposed method is a very efficient and simple tool for solving fractional differential equations.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 1; 43-56
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comprehensive cycloid pin-wheel precision reducer test platform integrated with a new dynamic measurement method of lost motion
    Autorzy:
    Yue, Huijun
    Wu, Xiangkai
    Shi, Zhaoyao
    Zhang, Yue
    Ye, Yong
    Zhang, Lintao
    Fu, Ying
    Powiązania:
    https://bibliotekanauki.pl/articles/2052087.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cycloid pin-wheel precision reducer
    RV reducer
    test platform
    comprehensive performance
    dynamic measurement of lost motion
    decomposition test method
    Opis:
    While cycloid pin-wheel precision reducers (referred to as RV reducers) are widely used in industrial robots, a widely accepted design standard or verification method of their test platforms is not available. In this study, a comprehensive sliding-separation test platform of RV reducers was developed. The test platform can test various measurement items such as transmission error, static measurement of lost motion, dynamic measurement of lost motion, torsional rigidity, no-load running torque, starting torque, backdriving torque, and transmission efficiency of the RV reducer for robots. The principle and method of dynamic measurement of lost motion tests based on the two-way transmission error method were studied and this test function was successfully integrated with the comprehensive test platform in order to increase the test items of the dynamic performance parameters of RV reducers. The measurement results of the no-load running torque of the RV reducer were consistent with the Stribeck curve. Based on the concept of optimal measurement speed, a decomposition test method of the geometric component of the dynamic measurement of lost motion and the elastic component of the dynamic measurement of lost motion was proposed in the dynamic measurement test of lost motion. Through precision calibration, function test and repeatability test, the results were compared with the data of enterprise’s samples. The consistent results have proved that the test platform met engineering requirements and measurement accuracy requirements. Based on the new test principle, the developed platform can test more parameters of RV reducers with high precision and display the comprehensive test performance.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 1; 207-229
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear solution to a non-Fourier heat conduction problem in a slab heated by laser source
    Nieliniowe rozwiązanie problemu niefourierowskiego przewodzenia ciepła w płycie nagrzewanej źródłem laserowym
    Autorzy:
    Noroozi, M. J.
    Saedodin, S.
    Ganji, D. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/950685.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    non-Fourier heat conduction problem
    nonlinear analysis
    C-V model
    Adomian Decomposition Method ADM
    laser heating
    problem niefourierowski przewodzenia ciepła
    analiza nieliniowa
    model C-V
    metoda dekompozycji Adomiana ADM
    nagrzewanie laserowe
    Opis:
    The effect of laser, as a heat source, on a one-dimensional finite body was studied in this paper. The Cattaneo-Vernotte non-Fourier heat conduction model was used for thermal analysis. The thermal conductivity was assumed temperature-dependent which resulted in a non-linear equation. The obtained equations were solved using the approximate-analytical Adomian Decomposition Method (ADM). It was concluded that the non-linear analysis is important in non-Fourier heat conduction problems. Significant differences were observed between the Fourier and non-Fourier solutions which stresses the importance of non-Fourier solutions in the similar problems.
    W artykule badano działanie laserowego źródła ciepła na ciało jednowymiarowe o skończonych wymiarach. Do analizy rozkładu temperatury zastosowano niefourierowski model przewodnictwa ciepła Cattaneo-Vernotte. Założono, że przewodność cieplna jest zależna od temperatury, w wyniku czego otrzymano równania nieliniowe. Do rozwiązania równań zastosowano przybliżoną analityczną metodę dekompozycji Adomiana (ADM). Stwierdzono, że analiza nieliniowa ma istotne znaczenie w problemach przewodnictwa ciepła typu niefourierowskiego. Zaobserwowano istotne różnice między rozwiązaniami fourierowskimi i niefourierowskimi, co podkreśla celowość stosowania tych ostatnich w podobnych problemach.
    Źródło:
    Archive of Mechanical Engineering; 2016, LXIII, 1; 129-144
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical solution of a fractional coupled system with the Caputo-Fabrizio fractional derivative
    Autorzy:
    Mansouri, Ikram
    Bekkouche, Mohammed Moumen
    Ahmed, Abdelaziz Azeb
    Powiązania:
    https://bibliotekanauki.pl/articles/2202061.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    Caputo-Fabrizio fractional derivative
    fractional integral
    coupled system
    fractional differential equation
    fixed point
    Adomian decomposition method
    pochodna ułamkowa Caputo-Fabrizio
    całkowanie ułamkowe
    system sprzężony
    ułamkowe równanie różniczkowe
    punkt stały
    metoda dekompozycji Adomiana
    Opis:
    Within this work, we discuss the existence of solutions for a coupled system of linear fractional differential equations involving Caputo-Fabrizio fractional orders. We prove the existence and uniqueness of the solution by using the Picard-Lindel ̈of method and fixed point theory. Also, to compute an approximate solution of problem, we utilize the Adomian decomposition method (ADM), as this method provides the solution in the form of a series such that the infinite series converge to the exact solution. Numerical examples are presented to illustrate the validity and effectiveness of the proposed method.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2023, 22, 1; 46--56
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solutions of Benjamin-Bona-Mahony, modified Camassa-Holm and Degasperis Procesi equations using an iterative method
    Autorzy:
    Kumar, Manoj
    Powiązania:
    https://bibliotekanauki.pl/articles/2202030.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    nonlinear Bejamin-Bona-Mahony equation
    modified Camassa-Holm equation
    modified Degasperis-Procesi equation
    Daftardar-Gejji and Jafari method
    homotopy perturbation method
    Adomian decomposition method
    nieliniowe równanie Bejamina-Bony-Mahony'ego
    zmodyfikowane równanie Camassy-Holma
    zmodyfikowane równanie Degasperisa-Procesiego
    metoda Daftardara-Gejji i Jafari
    metoda perturbacji homotopii
    metoda dekompozycji Adomiana
    Opis:
    In the present paper, we solve the non-linear Benjamin-Bona-Mahony, modified Camassa-Holm, and Degasperis-Procesi equations using an iterative method introduced by Daftardar-Gejji and Jafari. Results are compared with those obtained by other iterative methods such as the Adomian decomposition method and homotopy perturbation method. It is observed that the proposed method is computationally inexpensive and yields more accurate solutions than the Adomian decomposition method and the homotopy perturbation method.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 3; 59--72
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Direct method of hierarchical nonlinear optimization - reassessment after 30 years
    Autorzy:
    Karbowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/308864.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    hierarchical optimization
    decomposition
    direct method
    Benders method
    cutting plane method
    distributed computations
    Opis:
    We consider the optimization problems which may be solved by the direct decomposition method. It is possible when the performance index is a monotone function of other performance indices, which depend on two subsets of decision variables: an individual for every inner performance index and a common one for all. Such problems may be treated as a generalization of separable problems with the additive cost and constraints functions. In the paper both the underlying theory and the basic numerical techniques are presented and compared. A special attention is paid to the guarantees of convergence in different classes of problems and to the effectiveness of calculations.
    Źródło:
    Journal of Telecommunications and Information Technology; 2004, 3; 3-11
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Area-oriented technology mapping for LUT-based logic blocks
    Autorzy:
    Kubica, M.
    Kania, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/331370.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    SMTBDD
    FPGA
    synthesis method
    decomposition technique
    metoda syntezy
    technika rozkładu
    Opis:
    One of the main aspects of logic synthesis dedicated to FPGA is the problem of technology mapping, which is directly associated with the logic decomposition technique. This paper focuses on using configurable properties of CLBs in the process of logic decomposition and technology mapping. A novel theory and a set of efficient techniques for logic decomposition based on a BDD are proposed. The paper shows that logic optimization can be efficiently carried out by using multiple decomposition. The essence of the proposed synthesis method is multiple cutting of a BDD. A new diagram form called an SMTBDD is proposed. Moreover, techniques that allow finding the best technology mapping oriented to configurability of CLBs are presented. In the experimental section, the presented method (MultiDec) is compared with academic and commercial tools. The experimental results show that the proposed technology mapping strategy leads to good results in terms of the number of CLBs.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 1; 207-222
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Penalties, Lagrange multipliers and Nitsche mortaring
    Autorzy:
    Grossmann, Christian
    Powiązania:
    https://bibliotekanauki.pl/articles/729228.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    augmented Lagrangian
    penalty method
    domain decomposition
    Nitsche mortaring
    finite elements
    Opis:
    Penalty methods, augmented Lagrangian methods and Nitsche mortaring are well known numerical methods among the specialists in the related areas optimization and finite elements, respectively, but common aspects are rarely available. The aim of the present paper is to describe these methods from a unifying optimization perspective and to highlight some common features of them.
    Źródło:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2010, 30, 2; 205-220
    1509-9407
    Pojawia się w:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduced order models in PIDE constrained optimization
    Autorzy:
    Sachs, E. W.
    Schu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/969882.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    jump diffusion models
    proper orthogonal decomposition
    trust region method
    TRPOD
    Opis:
    Mathematical models for option pricing often result in partial differential equations originally starting with the Black-Scholes model. In this context, recent enhancements are models driven by Levy processes, which lead to a partial differential equation with an additional integral term. If one solves the problems mentioned last numerically, this yields large linear systems of equations with dense matrices. However, by using the special structure and an iterative solver the problem can be handled efficiently. To further reduce the computational cost in the calibration phase we implement a reduced order model, like proper orthogonal decomposition (POD), which proves to be very efficient. In this paper we use a special multi-level trust region POD algorithm to calibrate the option pricing model and give numerical results supporting the gain in efficiency.
    Źródło:
    Control and Cybernetics; 2010, 39, 3; 661-675
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Preparation of NC Microspheres and BuNENA Modified NC Microspheres by the Breath Figures Method
    Autorzy:
    He, L.
    He, W.
    Luo, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/358176.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    breath figures method
    thermal decomposition
    NC microspheres
    BuNENA modified NC microspheres
    Opis:
    The ‘breath figures’ method was used to prepare nitrocellulose (NC) microspheres and N-butyl-N-(2-nitroxyethyl)nitramine (BuNENA) modified NC microspheres (BMNM). By using acetone as the solvent and non-solvent n-hexane as the atmosphere, NC microspheres and BMNM were obtained. The matching of solvents and non-solvents was the key factor influencing the final morphology. TG and DSC were employed to study the thermal decomposition characteristics of BMNM. The results suggested that there were two distinct stages of thermal mass loss from the BMNM: the first was the mass loss associated with partial volatilisation of BuNENA, and its activation energy was 68.54 kJ/mol. The second mass loss was the thermal decomposition of NC and residual BuNENA with a high activation energy (249.53 kJ/mol, calculated by the Kissinger method). According to the thermal decomposition kinetics model, the optimal kinetics model of BMNM was B1-A2. The addition of BuNENA did not influence the thermal decomposition of NC.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 3; 567-578
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Singular Vectors in Acoustic Simulation Tests of St. Paul the Apostle Church in Bochnia
    Autorzy:
    Kosała, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/177255.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic quality
    index method
    churches
    singular value decomposition (SVD)
    acoustics adaptation
    Opis:
    A new approach to acoustic quality assessment of churches during simulation tests is proposed in the article. The numerical global index, based on four partial indices: reverberation, speech intelligibility, music sound index and a proposed new one – sound strength index, assesses the acoustic parameters of the model of the tested church in a complex manner. The global single number index was obtained from 17 simulations of acoustic adaptation options of the investigated church’s interior. The equation of the approximate global index has been obtained by means of singular vectors, obtained from Singular Value Decomposition (SVD) of the Index Observation Matrix of Simulation Variants (IOMSV). The weights of four partial indices and a universal equation of the global index have been calculated using the SVD technique to solve the problem of correlated acoustical parameters. The global index may be a helpful tool during simulation tests of acoustic quality assessment of churches. The proposed final equation of the global index does not require knowledge of the SVD technique and the values of acoustic parameters preferred for churches. Therefore the methodology proposed is easily applicable.
    Źródło:
    Archives of Acoustics; 2012, 37, 1; 23-30
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Kelvin method and mass spectrometry for investigation of oxide catalyst surface properties
    Autorzy:
    Maniak, G.
    Stelmachowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/115729.pdf
    Data publikacji:
    2010
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    work function
    Kelvin method
    mass spectrometry
    oxide catalyst
    N2O decomposition
    Opis:
    Many oxides are applied as a catalysts for commercially important processes. Recently, decomposition of nitrous oxide into nitrogen and oxygen have became a topic of vital interest for catalytic chemistry. Two possible ways of deN2O reaction, low temperature and high-temperature, can be distinguished. Promising results were obtained for spinel oxides which contained cobalt. Because of cationic redox route, triggered by electron transfer, of N2O decomposition over these oxides, investigation of their electronic properties was justifi ed. Th erefore the work function measurements, using Kelvin method were carried out. Moreover in-situ monitoring of processes occurred at catalyst’s surface was performed using mass spectrometry.
    Źródło:
    Challenges of Modern Technology; 2010, 1, 1; 11-13
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Single Number Index to Assess Selected Acoustic Parameters in Churches with Redundant Information
    Autorzy:
    Kosała, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/177017.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic quality
    index method
    sacral objects
    singular value decomposition (SVD)
    redundant information
    Opis:
    The paper presents an innovative approach for the index assessment of the acous- tic properties of churches. A new formula for an approximate single number index to assess selected acoustic parameters of church interiors, such as reverberation time (RT), speech intelligibility index (RASTI) and music clarity index (C80), is presented in the paper. The formula is created by means of the Singular Value Decomposition (SVD) method. An innovative approach for calculating the weights of partial in- dices is shown by solving the problem of redundant information, i.e., the system of overdetermined linear equations, using a computed pseudoinverse matrix. The new procedures for calculating the values of three partial indices and the single number index to assess selected acoustic parameters are presented. The proposed method was verified by measurements in several selected churches.
    Źródło:
    Archives of Acoustics; 2011, 36, 3; 545-560
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ensemble-based Method of Fraud Detection at Self-checkouts in Retail
    Autorzy:
    Vitynskyi, P.
    Tkachenko, R.
    Izonin, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/410756.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    classification
    Ensemble-based method
    Random Forest
    fraud detection
    retail
    Ito decomposition
    imbalanced dataset
    Opis:
    The authors consider the problem of fraud detection at self-checkouts in retail in condition of unbalanced data set. A new ensemble-based method is proposed for its effective solution. The developed method involves two main steps: application of the preprocessing procedures and the Random Forest algorithm. The step-by-step implementation of the preprocessing stage involves the sequential execution of such procedures over the input data: scaling by maximal element in a column with row-wise scaling by Euclidean norm, weighting by correlation and applying polynomial extension. For polynomial extension Ito decomposition of the second degree is used. The simulation of the method was carried out on real data. Evaluating performance was based on the use of cost matrix. The experimental comparison of the effectiveness of the developed ensemble-based method with a number of existing (simples and ensembles) demonstrates the best performance of the developed method. Experimental studies of changing the parameters of the Random Forest both for the basic algorithm and for the developed method demonstrate a significant improvement of the investigated efficiency measures of the latter. It is the result of all steps of the preprocessing stage of the developed method use.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2019, 8, 2; 3-8
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D Multi-Domain MFS Analysis of Sound Pressure Level Reduction Between Connected Enclosures
    Autorzy:
    Godinho, L.
    Branco, F. G.
    Mendes P., A.
    Powiązania:
    https://bibliotekanauki.pl/articles/177013.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Method of Fundamental Solutions (MFS)
    domain decomposition
    closed spaces
    sound pressure level reduction
    Opis:
    In this paper, the authors study the 3D propagation of sound waves between two closed spaces. The separation element between the two rooms is considered to include either a small opening or a homogeneous lightweight panel, coupling the two spaces. A numerical study of this configuration is performed, trying to understand the influence of the position and geometry of this opening in the sound pressure level reduction curve at low and midfrequencies. Additionally, the coupling effect between the two acoustic spaces is analyzed, in order to better understand its importance when determining the sound pressure level reduction. Different boundary conditions are ascribed to the walls of these rooms, simulating both the completely reflecting and partially absorbing surfaces. The numerical modelling was performed using a multi-domain formulation of the Method of Fundamental Solutions (MFS). The system is composed of two coupled rooms, limited by rigid or by absorbing walls, and separated by a thin wall (tending to null thickness) with a small opening. An experimental validation of the proposed model is presented, comparing its results with those found experimentally for a reduced-scale model. It is important to note that, for such a configuration, a traditional single-domain approach using methods like the MFS or the BEM would lead to undetermined equation systems, and thus the proposed model makes use of a domain decomposition technique.
    Źródło:
    Archives of Acoustics; 2011, 36, 3; 575-601
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation Models for Acoustic Analysis of St. Elizabeth of Hungary Church in Jaworzno Szczakowa
    Autorzy:
    Kosała, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/177877.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic quality
    index method
    church acoustics
    Singular Value Decomposition
    SVD
    acoustic simulation tests
    Opis:
    In parallel with research conducted using conventional methods, a uniform index method for assessing the acoustic quality of Roman Catholic churches has been developed. The latest version of the index method has been created using the index observation matrix of 12 churches which have been rated by means of the single number global index. Assessments of the acoustic quality of any Roman Catholic church, using two calculation models: the Global Acoustic Properties Index (GAP) and the Global Index (GI), are shown in the article. The verification was performed on the example of one church, showing the way of calculating global indices to assess the acoustic quality of a new facility. The next stages in the development of the index method for assessing the acoustic quality of churches were taking into account the audience, using simulation tests and determining the spatial distribution of the single number GAP index in an examined church. An attempt to use the GAP and GI calculation models to assess the acoustic properties of some churches is also shown in the article.
    Źródło:
    Archives of Acoustics; 2016, 41, 3; 485-498
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A fault location method for hybrid transmission lines based on empirical Fourier decomposition
    Autorzy:
    Tao, Caixia
    Xing, Baosheng
    Li, Taiguo
    Powiązania:
    https://bibliotekanauki.pl/articles/27309957.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    empirical Fourier decomposition
    fault location
    hybrid lines
    Teager energy operator
    traveling wave method
    Opis:
    This paper aims to address the problems of inaccurate location and large computation in hybrid transmission line traveling wave detection methods. In this paper, a new fault location method based on empirical Fourier decomposition (EFD) and the Teager energy operator (TEO) is proposed. Firstly, the combination of EFD and the TEO is used to detect the time difference between the arrival of the initial traveling wave of the fault at the two measurement ends of the hybrid line. Then, when the fault occurs at the midpoint of each line segment and at the connection point of the hybrid line, the time difference between the arrival of the fault traveling wave at the two measurement ends of the line is calculated according to the line parameters. By comparing the obtained time differences, it is determined whether the fault occurs in the first or second half of the line. Finally, the fault distance is calculated using the double-ended traveling wave method according to the fault section. The model was built on PSCAD and the proposed algorithm was simulated on MATLAB platform. The results demonstrate that the proposed method achieves an average fault location accuracy of 98.88% by adjusting transition resistances and fault distances and comparing with other location methods. After validation, the proposed method for locating faults has a high level of accuracy in location, computational efficiency, and reliability. It can accurately identify fault segments and locations in hybrid transmission line systems.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 4; 1035--1053
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decorrelation of indices for a single number assessment of the acoustic quality of sacral objects
    Dekorelacja wskaźników w jednoliczbowej ocenie jakości akustycznej obiektów sakralnych
    Autorzy:
    Kosała, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/328081.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    rozkład SVD
    dekorelacja
    wskaźnikowa metoda oceny
    singular value decomposition
    SVD
    decorrelation
    index method of assessment
    Opis:
    A new approach for solving the problem of a single number index formula by creating the index from mutually-correlated indices by means of decorrelation of the Index Observation Matrix (IOM) was shown. The orthogonal singular vectors obtained from SVD were used in order to build a single number index. Application of the proposed formula for a local single number index of selected acoustic parameters of the interiors of six Roman Catholic churches was shown. Decorrelation of the indices for a single number assessment of the acoustic quality of sacral objects will be applied for complex global acoustic assessment of such interiors' index method, which is currently being improved.
    Pokazane w artykule nowe podejście do rozwiązania problemu opracowania wskaźnika jednoliczbowego, polega na utworzeniu tego wskaźnika ze wskaźników skorelowanych ze sobą, na drodze dekorelacji wskaźnikowej macierzy obserwacji. Do konstrukcji wskaźnika jednoliczbowego wykorzystano, uzyskane z rozkładu SVD, ortogonalne wektory szczególne. Weryfikację zaproponowanego wzoru na jednoliczbowy lokalny wskaźnik wybranych parametrów akustycznych obiektów sakralnych pokazano na sześciu rzeczywistych kościołach rzymskokatolickich. Dekorelacja wskaźników w jednoliczbowej ocenie jakości akustycznej obiektów sakralnych będzie wykorzystana do kompleksowej globalnej oceny jakości akustycznej obiektów sakralnych - metody wskaźnikowej, która jest w dalszym ciągu udoskonalana.
    Źródło:
    Diagnostyka; 2011, 2(58); 49-52
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solving Forward-Looking Models of Cross-Country Adjustment within the Euro Area
    Autorzy:
    Torój, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/483343.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solving rational expectations models
    generalized Schur decomposition
    heterogenous information sets
    method of Christiano
    divergences in EMU
    Opis:
    This article introduces and applies two refinements to the algorithm of solving rational expectations models of a currency union. Firstly, building upon Klein (2000), it generalizes the standard methods of solving rational expectations models to the case of time-varying nonstochastic parameters, recurring in a finite cycle. Such a specification occurs in a simple stylized New Keynesian model of the euro area after a joint introduction of (i) rotation in the ECB Governing Council (as constituted by the Treaty of Nice) and (ii) home bias in the interest rate decisions preferred by its members. Secondly, we apply the method of Christiano (2002) to solve the model with heterogenous information sets. This is justified if we argue that the information set of domestic economic agents in a currency union is home-biased (i.e. foreign shocks enter only with a lag). Both methods of solution are illustrated with simulation results.
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2009, 1, 3; 211-241
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of movable approximation and wavelet decomposition to smoothing-out procedure of ship engine indicator diagrams
    Autorzy:
    Polanowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/260419.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    smoothing-out the runs
    least squares method
    full-interval approximation
    movable approximation
    decomposition of disturbances
    cut constraints
    glued constraints
    riveted constraints
    broken constraints
    weighting factors
    wavelet decomposition
    Opis:
    In this paper - on the basis of indicator diagram processing taken as an example - were shown possibilities of the smoothing-out and decomposing of run disturbances with the use of the movable multiple approximation based on the least squares criterion. The notion was defined of movable approximating object and constraints used to form approximation features. It was demonstrated that the multiple approximation can be used to decompose disturbances out of an analyzed run. The obtained smoothing-out results were compared with those obtained from full-interval approximation of runs by means of splines as well as wavelet decomposition with using various wavelets, Wavelet Explorer and Mathematica software. Smoothing-out quality was assessed by comparing runs of first derivatives which play crucial role in the advanced processing of indicator diagrams.
    Źródło:
    Polish Maritime Research; 2007, 2; 12-17
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Singular vectors in the synthesis of indices for acoustic assessment of objects
    Wektory szczególne w syntezie wskaźników oceny akustycznej obiektów
    Autorzy:
    Kosała, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/329542.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    rozkład względem wartości szczególnych
    dekorelacja
    wskaźnikowa metoda oceny
    singular value decomposition
    SVD
    decorrelation
    index method of assessment
    Opis:
    The SVD (Singular Value Decomposition) technique makes it possible to transform a set of correlated data into uncorrelated ones without the loss of any information. The new system of mutually uncorrelated variables is comparable to the initial one. Apart from decorrelation of data, SVD makes full variable correlation possible, which ensures no copying of certain information during the addition of such new variables. This article presents the application of the SVD technique for the construction of singlenumber indices for assessment of correlated object acoustic parameters using the methods of decorrelation and full correlation. Verification of the proposed single-number assessment indices was carried out using the example of sacral buildings. For one Roman Catholic church with flawed acoustics, the application of a single-number index for assessment of the variant of proposed acoustic adaptation of its interior was shown. The synthetic index applied for sacral objects, being an approximated general measure of assessment, can be a helpful tool for designers and during assessment of church interiors in terms of the acoustic functioning of the object.
    Technika rozkładu względem wartości szczególnych (SVD) umożliwia przekształcenie zbioru danych skorelowanych w dane nieskorelowane, bez utraty jakiejkolwiek informacji. Nowy układ zmiennych wzajemnie nieskorelowanych jest porównywalny z układem wyjściowym. Oprócz dekorelacji, SVD umożliwia korelację zupełną zmiennych, zapewniającą brak powielenia pewnych informacji przy sumowaniu doskonale skorelowanych nowych zmiennych. W artykule pokazano wykorzystanie techniki SVD do konstrukcji jednoliczbowych wskaźników oceny skorelowanych parametrów akustycznych obiektów metodami dekorelacji i korelacji zupełnej. Weryfikację zaproponowanych jednoliczbowych ocen wskaźnikowych przeprowadzono na przykładzie kilku obiektów sakralnych. Dla jednego kościoła-rzymsko katolickiego o wadliwej akustyce pokazano zastosowanie jednoliczbowego wskaźnika do oceny wariantu zaproponowanej adaptacji akustycznej tego wnętrza. Syntetyczny wskaźnik zastosowany dla obiektów sakralnych, będący przybliżoną miarą ogólną oceny, może być pomocnym narzędziem dla projektantów oraz przy ocenie wnętrz kościelnych, związanej z prawidłowym pod względem akustycznym funkcjonowaniem obiektu.
    Źródło:
    Diagnostyka; 2012, 2(62); 31-36
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An efficient algorithm for adaptive total variation based image decomposition and restoration
    Autorzy:
    Liu, X.
    Huang, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/330619.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    image decomposition
    image restoration
    adaptive total variation
    H-1 norm
    split Bregman method
    dekompozycja obrazu
    odtworzenie obrazu
    wariacja zupełna adaptacyjna
    metoda Bregmana
    Opis:
    With the aim to better preserve sharp edges and important structure features in the recovered image, this article researches an improved adaptive total variation regularization and H-1 norm fidelity based strategy for image decomposition and restoration. Computationally, for minimizing the proposed energy functional, we investigate an efficient numerical algorithm—the split Bregman method, and briefly prove its convergence. In addition, comparisons are also made with the classical OSV (Osher–Sole–Vese) model (Osher et al., 2003) and the TV-Gabor model (Aujol et al., 2006), in terms of the edge-preserving capability and the recovered results. Numerical experiments markedly demonstrate that our novel scheme yields significantly better outcomes in image decomposition and denoising than the existing models.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2014, 24, 2; 405-415
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the extrapolated VMS-POD method for incompressible flows
    Ekstrapolacyjna metoda VMS-POD dla nieściślliwych przepływów
    Autorzy:
    Eroglu, Fatma G.
    Kaya, Songul
    Powiązania:
    https://bibliotekanauki.pl/articles/29520310.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    proper orthogonal decomposition
    extrapolated Crank-Nicholson
    reduced-order modelling
    projection-based variational multiscale
    finite element method
    rozkład ortogonalny
    modelowanie zredukowane
    metoda elementów skończonych
    Opis:
    In this study, proper orthogonal decomposition based reduced-order modelling and variational multiscale stabilization method are utilized for the incompressible Navier-Stokes equations. In addition, the difficulties resulting from nonlinearity are eliminated using the extrapolation. Theoretical analysis of the method is presented. To check the efficiency of the proposed method, we utilize the test problem of 2D channel flow past a cylinder.
    W artykule zastosowano obniżenie rzędu modelu i wariacyjną wieloskalową stabilizacię, wykorzystujące ortogonalną dekompozycję, do rozwiązania równania Naviera-Stokesa dla nieściśliwych płynów. Trudności wynikające z nieliniowości wyeliminowano poprzez zastosowanie ekstrapolacji. W pracy opisano teoretyczne podstawy metody. W celu sprawdzenia wydajności opracowanej metody zastosowano ję do testowego problemu przepływu 2D przez cylindryczny kanał.
    Źródło:
    Computer Methods in Materials Science; 2019, 19, 2; 70-77
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wybrane aspekty oznaczania rtęci techniką zimnych par z mineralizacją oraz z pirolitycznym rozkładem próbki
    Some special problems in the determination of mercury by the cold vapour technique with mineralization or thermal decomposition of a sample
    Autorzy:
    Kopciał, P.
    Laska-Józefczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/907104.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
    Tematy:
    rtęć
    oznaczanie rtęci
    metoda zimnych par
    mineralizacja
    rozkład termiczny
    spektrometria absorpcji atomowej
    mercury
    mercury determination
    cold vapour method
    mineralization
    thermal decomposition
    atomic absorption spectrometry
    Opis:
    Rtęć jako pierwiastek toksyczny jest przedmiotem szczególnego zainteresowania instytucji zdrowia publicznego oraz organów normalizacyjnych na całym świecie. Prawidłowe określenie zawartości tego pierwiastka we wszelkiego rodzaju materiałach, zarówno przemysłowych, jak i z życia codziennego stanowi najtrudniejszy aspekt zagadnienia. W prezentowanej pracy zwrócono uwagę na dokładne i precyzyjne przeprowadzenie oznaczeń rtęci za pomocą dwóch metod wykorzystujących absorpcyjną spektroskopię atomową – pierwszą z zastosowaniem mineralizacji mikrofalowej próbki oraz drugą z jej termicznym rozkładem. Przedstawiono możliwe zagrożenia oraz błędy występujące podczas procesu analitycznego. W tym celu zbadano te same próbki materiałów dwiema metodami, zinterpretowano wyniki i wyłoniono metodę o większym stopniu jakości rezultatów.
    Mercury as a toxic element is in particular interest of the public health and standardization bodies worldwide. The most difficult aspect of the problem is the correct determination of the content of this element in all kinds of materials, both industrial and everyday life. This work was focused on the accurate and precise determination of mercury using two methods based on atomic absorption spectroscopy – first with microwave mineralization of the sample and another with thermal decomposition of the material. It shows possible dangers and errors that occur during the analytical process. The same material samples were analyzed with two methods, the results were interpreted and finally the method with a greater degree of results quality was selected.
    Źródło:
    Prace Instytutu Ceramiki i Materiałów Budowlanych; 2016, R. 9, nr 25, 25; 18-26
    1899-3230
    Pojawia się w:
    Prace Instytutu Ceramiki i Materiałów Budowlanych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of a multicriterial optimization to the resolution of X-ray diffraction curves of semicrystalline polymers
    Zastosowanie optymalizacji wielokryterialnej do rozkładu rentgenowskich krzywych dyfrakcyjnych polimerów semikrystalicznych
    Autorzy:
    Rabiej, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205322.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    multicriterial optimization
    WAXD method
    curve fitting
    curve decomposition
    statistical verification
    statistical test
    optymalizacja wielokryterialna
    metoda WAXD
    dopasowywanie krzywych
    rozkład krzywych
    weryfikacja statystyczna
    test statystyczny
    Opis:
    The analysis of wide angle X-ray diffraction (WAXD) curves of semicrystalline polymers is connected with their decomposition into crystalline peaks and amorphous components. To this aim a theoretical curve is constructed which is a best fitted, mathematical model of the experimental one. All parameters of the theoretical curve are found using an optimization procedure. As it has been already proved, a reliable decomposition can be performed only by means of a procedure which effectively performs a multicriterial optimization. It consists in minimization of the sum of squared deviations between the theoretical and experimental curves and simultaneous maximization of the area of the amorphous component. So, the objective function in the optimization procedure is constructed of two criterial functions which represent the two requirements. The proportions between the criterial functions and their significance at different stages of the procedure must be determined by suitable weights. A proper choice of the weights is an important part of the procedure. In this paper a new solution of this problem is presented: the weights are changed dynamically in subsequent steps of the optimization procedure. A few different algorithms of the weights determination are presented and evaluated by means of several statistical method. The optimization procedures equipped with these algorithms are tested using WAXD patterns of popular polymers: Cellulose I, Cellulose II and PET. It is shown that the optimization procedures equipped with the dynamic algorithms of weights determination are much more effective than the procedures using some constant, arbitrarily chosen weights.
    Dokonanie analizy krzywych dyfrakcyjnych WAXD polimerów semikrystalicznych, związanej z ich dekompozycją na składowe krystaliczne i amorficzne, wymaga zbudowania funkcji stanowiącej matematyczny model zarejestrowanej krzywej dyfrakcyjnej. Do wyznaczenia parametrów tej funkcji stosuje się nieliniową optymalizację wielokryterialną, polegającą na minimalizacji sumy kwadratów odchyleń krzywej teoretycznej od krzywej eksperymentalnej oraz maksymalizacji pola pod składową amorficzną. Funkcja celu jest więc skonstruowana z dwóch funkcji kryterialnych, które reprezentują te dwa warunki. Proporcje między tymi funkcjami i ich znaczenie na poszczególnych etapach procedury optymalizacyjnej muszą być określane przez odpowiednie wagi. Właściwy dobór wag dla funkcji kryterialnych jest jednym z trudniejszych zadań. Zaprezentowano nowe rozwiązanie problemu doboru wag dla funkcji kryterialnych: wagi zmieniano dynamicznie w kolejnych krokach procedury. Zaproponowano kilka różnych algorytmów wyznaczania wag. Algorytmy porównano i oceniono za pomocą testów statystycznych. Procedury wyposażone w te algorytmy zastosowano do rozkładu krzywych dyfrakcyjnych celulozy I, celulozy II i poliestru. Wykazano, że procedury wyposażone w dynamiczne algorytmy wyznaczania wag są znacznie bardziej skuteczne niż procedury wykorzystujące wagi stałe, ustalone arbitralnie.
    Źródło:
    Polimery; 2017, 62, 11-12; 821-833
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Derivative free optimal thrust allocation in ship dynamic positioning based on direct search algorithms
    Autorzy:
    Valčić, M.
    Prpić-Oršić, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/116991.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    algorithm
    dynamic positioning
    direct search algorithms
    sequential quadratic programing (SQP)
    Singular Values Decomposition (SVD)
    Lagrangian Multiplier Method (LMM)
    Direct Search (DS)
    Mesh Adaptive Direct Search (MADS)
    Opis:
    In dynamic positioning systems, nonlinear cost functions, as well as nonlinear equality and inequality constraints within optimal thrust allocation procedures cannot be handled directly by means of the solvers like industry-standardized quadratic programing (QP), at least not without appropriate linearization technique applied, which can be computationally very expensive. Thus, if optimization requirements are strict, and problem should be solved for nonlinear objective function with nonlinear equality and inequality constraints, than one should use some appropriate nonlinear optimization technique. The current state-of-the-art in nonlinear optimization for gradient-based algorithms is surely the sequential quadratic programing (SQP), both for general applications and specific thrust allocation problems. On the other hand, in recent time, one can also notice the increased applications of gradient-free optimization methods in various engineering problems. In this context, the implementation of selected derivative free direct search algorithms in optimal thrust allocation is proposed and discussed in this paper, and avenues for future research are provided.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 309-314
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stabilized model reduction for nonlinear dynamical systems through a contractivity-preserving framework
    Autorzy:
    Chaturantabut, Saifon
    Powiązania:
    https://bibliotekanauki.pl/articles/1838159.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    model order reduction
    ordinary differential equation
    partial differential equation
    proper orthogonal decomposition
    discrete empirical interpolation method
    redukcja rzędu modelu
    równanie różniczkowe zwyczajne
    równanie różniczkowe cząstkowe
    rozkład ortogonalny
    Opis:
    This work develops a technique for constructing a reduced-order system that not only has low computational complexity, but also maintains the stability of the original nonlinear dynamical system. The proposed framework is designed to preserve the contractivity of the vector field in the original system, which can further guarantee stability preservation, as well as provide an error bound for the approximated equilibrium solution of the resulting reduced system. This technique employs a low-dimensional basis from proper orthogonal decomposition to optimally capture the dominant dynamics of the original system, and modifies the discrete empirical interpolation method by enforcing certain structure for the nonlinear approximation. The efficiency and accuracy of the proposed method are illustrated through numerical tests on a nonlinear reaction diffusion problem.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2020, 30, 4; 615-628
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parameter identification of ship maneuvering models using recursive least square method based on support vector machines
    Autorzy:
    Zhu, M.
    Hahn, A.
    Wen, Y.
    Bolles, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/116455.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    ship manoeuvering
    recursive least square method
    ship manoeuvering model
    ship maneuverability prediction
    Support Vector Machines (SVM)
    empirical mode decomposition (EMD)
    Computational Fluid Dynamics (CFD)
    Extended Kalman Filter (EKF)
    Opis:
    Determination of ship maneuvering models is a tough task of ship maneuverability prediction. Among several prime approaches of estimating ship maneuvering models, system identification combined with the full-scale or free- running model test is preferred. In this contribution, real-time system identification programs using recursive identification method, such as the recursive least square method (RLS), are exerted for on-line identification of ship maneuvering models. However, this method seriously depends on the objects of study and initial values of identified parameters. To overcome this, an intelligent technology, i.e., support vector machines (SVM), is firstly used to estimate initial values of the identified parameters with finite samples. As real measured motion data of the Mariner class ship always involve noise from sensors and external disturbances, the zigzag simulation test data include a substantial quantity of Gaussian white noise. Wavelet method and empirical mode decomposition (EMD) are used to filter the data corrupted by noise, respectively. The choice of the sample number for SVM to decide initial values of identified parameters is extensively discussed and analyzed. With de-noised motion data as input-output training samples, parameters of ship maneuvering models are estimated using RLS and SVM-RLS, respectively. The comparison between identification results and true values of parameters demonstrates that both the identified ship maneuvering models from RLS and SVM-RLS have reasonable agreements with simulated motions of the ship, and the increment of the sample for SVM positively affects the identification results. Furthermore, SVM-RLS using data de-noised by EMD shows the highest accuracy and best convergence.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 1; 23-29
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowe metody w badaniach struktur polikryształów
    New methods in investigations of polycrystalline materials
    Autorzy:
    Łasocha, W.
    Luberda-Durnaś, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/172430.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    dyfraktometria proszkowa
    wskaźnikowanie obrazów dyfrakcyjnych
    rozkład obrazu dyfrakcyjnego na intensywności
    uściślanie struktur metodą Rietvelda
    metoda badań strukturalnych
    powder diffractometry
    indexing of diffraction patterns
    powder diffraction pattern decomposition
    structure refinement using the Rietveld method
    methods of structural studies
    Opis:
    In this chapter, information on good laboratory practice in the field of structural powder diffractometry has been collected. The authors attempt to describe how to plan a measurement, how to find the cell parameters, how to build a model of the structure, and how to refine and verify it. There are many methods and procedures which lead to solving a crystal structure. However, the experience of recent years shows that, in the case of many materials, an investigator has to attempt the problem of structure solution using many different methods. The software is easily available (from ‘trial and error’ or classic to sophisticated modern approaches), as is a lot of good equipment. On the other hand, the complexity of the structures studied using powder diffraction methods is continually increasing. No description of any methods of research other than diffraction techniques is presented. We have also focused on polycrystalline materials. Amorphous substances and methods using the formalism of ‘pair distribution functions’ are beyond the scope of this paper. New methods of structural studies (including algorithms from research described in the literature, even if their applicability has been relatively slight) were treated with particular attention. In addition to the description of methods, we also collected some useful (in our opinion) information about available software and crystallographic databases.
    Źródło:
    Wiadomości Chemiczne; 2014, 68, 5-6; 507-543
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A fast neural network learning algorithm with approximate singular value decomposition
    Autorzy:
    Jankowski, Norbert
    Linowiecki, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/330870.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    Moore–Penrose pseudoinverse
    radial basis function network
    extreme learning machine
    kernel method
    machine learning
    singular value decomposition
    deep extreme learning
    principal component analysis
    pseudoodwrotność Moore–Penrose
    radialna funkcja bazowa
    maszyna uczenia ekstremalnego
    uczenie maszynowe
    analiza składników głównych
    Opis:
    The learning of neural networks is becoming more and more important. Researchers have constructed dozens of learning algorithms, but it is still necessary to develop faster, more flexible, or more accurate learning algorithms. With fast learning we can examine more learning scenarios for a given problem, especially in the case of meta-learning. In this article we focus on the construction of a much faster learning algorithm and its modifications, especially for nonlinear versions of neural networks. The main idea of this algorithm lies in the usage of fast approximation of the Moore–Penrose pseudo-inverse matrix. The complexity of the original singular value decomposition algorithm is O(mn2). We consider algorithms with a complexity of O(mnl), where l < n and l is often significantly smaller than n. Such learning algorithms can be applied to the learning of radial basis function networks, extreme learning machines or deep ELMs, principal component analysis or even missing data imputation.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2019, 29, 3; 581-594
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decomposition Analysis of the Greenhouse Gas Emissions in the European Union
    Analiza rozkładu emisji gazów cieplarnianych w krajach Unii Europejskiej
    Autorzy:
    Drastichová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/371404.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
    Tematy:
    decomposition
    climate change
    European Union (EU)
    Greenhouse Gas Emissions (GHGs)
    Log-Mean Divisia Index Method (LMDI)
    Kyoto Protocol
    sustainable development
    JEL Classification
    dekompozycja
    zmiany klimatyczne
    Unia Europejska
    emisja gazów cieplarnianych
    metoda LMDI
    Protokół z Kioto
    rozwój zrównoważony
    Opis:
    Climate change is a significant threat to sustainable development (SD). Using the Log-Mean Divisia Index Method (LMDI) a decomposition of the data on the greenhouse gas (GHG) emissions in the European Union (EU) in 2000 -2013 is carried out. To detect if decoupling of the environmental variable represented by the GHG emissions from the economic variable represented by the GDP was taking place in the EU economy, the changes of the GHG emissions were divided into three effects. These factors include the economic activity (scale), the composition or structure of the EU economy with respect to the countries, and GHG intensity of the countries. The aim of the paper is to detect if decoupling of the GHG emissions from the GDP development in the EU took place and to detect the factors of this development. The intensity effect was mainly responsible for the reduction of the GHG emissions in the EU while the scale effect contributed to their increase. The role of the composition effect was only marginal; however, it was positive. As the intensity effect often showed the high negative values, the total effect was often negative as well, which means that decoupling of GHG emissions from GDP took place.
    Zmiany klimatyczne stanowią istotne zagrożenie dla zrównoważonego rozwoju (ZR). Przy pomocy metody LMDI przeprowadzono analizę rozkładu emisji gazów cieplarnianych w krajach Unii Europejskiej (UE) w okresie lat 2010-2013. Aby sprawdzić, czy decoupling zmiennej środowiskowej reprezentowanej przez emisję gazów cieplarnianych od zmiennej ekonomicznej reprezentowanej przez PKB w kontekście zmian emisji gazów cieplarnianych zachodzi we Wspólnocie, uwzględniono następujące efekty: aktywność ekonomiczną (skalę), skład i strukturę europejskiej ekonomii z uwzględnieniem różnic charakterystycznych dla poszczególnych krajów i poziomu ich emisji gazów cieplarnianych. Celem artykułu jest potwierdzenie, czy decoupling emisji gazów cieplarnianych od wzrostu PKB faktycznie zachodzi i jakie czynniki na niego wpływają. Efekt intensywności okazał się być odpowiedzialny głównie za zmniejszenie emisji gazów cieplarnianych w Europie, podczas gdy efekt skali przyczyniał się do wzrostu tej emisji. Efekt struktury odgrywał rolę marginalną, choć pozytywną. Efekt intensywności zwykle charakteryzował się wysokimi wartościami ujemnymi, to samo odnosiło się do efektu całkowitego, co oznacza, że decoupling emisji gazów cieplarnianych od PKB faktycznie zachodzi.
    Źródło:
    Problemy Ekorozwoju; 2017, 12, 2; 27-35
    1895-6912
    Pojawia się w:
    Problemy Ekorozwoju
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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