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    Wyświetlanie 1-7 z 7
    Tytuł:
    Discretization of the stationary distribution of heat in the non-homogeneous body
    Autorzy:
    Bożek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049973.pdf
    Data publikacji:
    2004
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    elliptic partial differential equations
    stationary distribution of heat
    discretization method
    Opis:
    We give a short survey on the theory of the mixed boundary-value problem for the stationary Fourier equation in a non-homogeneous medium defined on any Lipschitz domain $\Omega \rcup \mathbb{R}^{n} (n \ge 2)$. The compatibility condition for the thermal flux has been established by the standard procedure of integration the divergence.
    Źródło:
    Opuscula Mathematica; 2004, 24, 1; 19-33
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of distribution of temperature in three-dimensional solid changing its shape during the process
    Autorzy:
    Bożek, B.
    Mączka, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/255226.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    parabolic partial differential equations
    non-stationary distribution of heat
    finite element method
    Galerkin method
    Opis:
    The present paper suplements and continues [2]. Galerkin method for the Fourier-Kirchoff equation in the case when Omega(t) - equation domain, dependending on time t, is constructed. For special case Omega(t) rcup R2 the computer program for above method is written. Binaries and sources of this program are available on http://wms.mat.agh.edu.pl/~bozek.
    Źródło:
    Opuscula Mathematica; 2005, 25, 2; 169-179
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of an MAP/PH/1 queue with flexible group service
    Autorzy:
    Brugno, A.
    D’Apice, C.
    Dudin, A.
    Manzo, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/330419.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    queueing system
    batch service
    multirate service
    stationary distribution
    optimization
    system kolejkowy
    usługa wsadowa
    usługa wielotaryfowa
    rozkład stacjonarny
    Opis:
    A novel customer batch service discipline for a single server queue is introduced and analyzed. Service to customers is offered in batches of a certain size. If the number of customers in the system at the service completion moment is less than this size, the server does not start the next service until the number of customers in the system reaches this size or a random limitation of the idle time of the server expires, whichever occurs first. Customers arrive according to a Markovian arrival process. An individual customer’s service time has a phase-type distribution. The service time of a batch is defined as the maximum of the individual service times of the customers which form the batch. The dynamics of such a system are described by a multi-dimensional Markov chain. An ergodicity condition for this Markov chain is derived, a stationary probability distribution of the states is computed, and formulas for the main performance measures of the system are provided. The Laplace–Stieltjes transform of the waiting time is obtained. Results are numerically illustrated.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 1; 119-131
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An asymptotic expansion for the distribution of the supremum of a random walk
    Autorzy:
    Sgibnev, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1206084.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    random walk
    supremum
    submultiplicative function
    characteristic equation
    absolutely continuous component
    oscillating random walk
    stationary distribution
    asymptotic expansions
    Banach algebras
    Laplace transform
    Opis:
    Let ${S_n}$ be a random walk drifting to -∞. We obtain an asymptotic expansion for the distribution of the supremum of ${S_n}$ which takes into account the influence of the roots of the equation $1-∫_ℝe^{sx}F(dx)=0,F$ being the underlying distribution. An estimate, of considerable generality, is given for the remainder term by means of submultiplicative weight functions. A similar problem for the stationary distribution of an oscillating random walk is also considered. The proofs rely on two general theorems for Laplace transforms.
    Źródło:
    Studia Mathematica; 2000, 140, 1; 41-55
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling language extinction using Susceptible-Infectious-Removed (SIR) model
    Autorzy:
    Ikoba, N. A.
    Jolayemi, E. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1186921.pdf
    Data publikacji:
    2019-12-10
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    language extinction
    stochastic epidemic model
    non-homogeneous mixing
    quasi-stationary distribution
    time in which a language is expected to be extinct
    Opis:
    The study presents a stochastic epidemic model applied to the model of indigenous language extinction. The Susceptible-Infectious-Removed (SIR) categorization of an endemic disease has been reformulated to capture the dynamics of indigenous language decline, based on the assumption of non-homogeneous mixing. The time in which an indigenous language is expected to be extinct was derived using a modified SIR model with the population segmented into several sub-communities of small sizes representing family units. The data obtained from the 2016 indigenous language survey conducted in several parts of Nigeria and from the 2013 Nigeria Demographic Health Survey (NDHS) were used to estimate the key parameters of the model for Nigeria’s several indigenous languages. The parameters of interest included the basic reproduction number, the threshold of endemicity, and the time in which a language is expected to be extinct, starting from the endemic level. On the basis of the time in which a language is expected to be extinct, several of the surveyed languages appeared to be in a precarious condition, while others seemed virile, thanks to a high language transfer quotient within families.
    Źródło:
    Statistics in Transition new series; 2019, 20, 4; 71-87
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dispersive functions and stochastic orders
    Autorzy:
    Bartoszewicz, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/1339146.pdf
    Data publikacji:
    1997
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    stationary renewal distribution
    mean residual life
    preservation theorem
    partial orders
    hazard function
    dispersive function
    Opis:
    Generalizations of the hazard functions are proposed and general hazard rate orders are introduced. Some stochastic orders are defined as general ones. A unified derivation of relations between the dispersive order and some other orders of distributions is presented
    Źródło:
    Applicationes Mathematicae; 1996-1997, 24, 4; 429-444
    1233-7234
    Pojawia się w:
    Applicationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cooling and heating of the fluid in the cylindrical volume
    Autorzy:
    Tkachenko, Stanislav
    Vlasenko, Olha
    Rezydent, Nataliia
    Stepanov, Dmytro
    Stepanova, Nataliia
    Powiązania:
    https://bibliotekanauki.pl/articles/2142869.pdf
    Data publikacji:
    2022
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    non-stationary heat exchange
    regular thermal mode
    cooling rate
    heating rate
    heat transfer coefficient
    uneven temperatures distribution coefficient
    niestacjonarna wymiana ciepła
    zwykły tryb termiczny
    szybkość chłodzenia
    szybkość ogrzewania
    współczynnik przenikania ciepła
    współczynnik rozkładu temperatur
    Opis:
    Experimental studies of the non-stationary heat exchange in the system «environment I – body II» have been carried out. It is established that in the body II, which consists of the fluid and thin-walled metal envelope, the characteristic features of the regular thermal mode occur, i.e., cooling (heating) rate of the body II- m = const; heat transfer coefficient between the water (environment I) and body II is practically stable α1 = const; uneven temperatures distribution coefficient in the body II ψ = const. This new notion of the heat transfer regularities in the body II is planned to apply for further development of the experimental-calculation method for the forecasting of the heat exchange intensity in the compound fluid media with limited information regarding thermophysical and rheological properties.
    Źródło:
    Acta Innovations; 2022, 42; 15-26
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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