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Wyszukujesz frazę "natural series" wg kryterium: Temat


Wyświetlanie 1-4 z 4
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:
Improving prediction models applied in systems monitoring natural hazards and machinery
Autorzy:
Sikora, M.
Sikora, B.
Powiązania:
https://bibliotekanauki.pl/articles/331302.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
zagrożenie naturalne
szereg czasowy
k-najbliższy sąsiad
natural hazards monitoring
regression rules
time series forecasting
k-nearest neighbors
Opis:
A method of combining three analytic techniques including regression rule induction, the k-nearest neighbors method and time series forecasting by means of the ARIMA methodology is presented. A decrease in the forecasting error while solving problems that concern natural hazards and machinery monitoring in coal mines was the main objective of the combined application of these techniques. The M5 algorithm was applied as a basic method of developing prediction models. In spite of an intensive development of regression rule induction algorithms and fuzzy-neural systems, the M5 algorithm is still characterized by the generalization ability and unbeatable time of data model creation competitive with other systems. In the paper, two solutions designed to decrease the mean square error of the obtained rules are presented. One consists in introducing into a set of conditional variables the so-called meta-variable (an analogy to constructive induction) whose values are determined by an autoregressive or the ARIMA model. The other shows that limitation of a data set on which the M5 algorithm operates by the k-nearest neighbor method can also lead to error decreasing. Moreover, three application examples of the presented solutions for data collected by systems of natural hazards and machinery monitoring in coal mines are described. In Appendix, results of several benchmark data sets analyses are given as a supplement of the presented results.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 2; 477-491
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of DST results to the evaluation of changes of geologic conditions of Rotliegend series in the Polish Lowland
Autorzy:
Dubiel, S.
Rybicki, Cz.
Zubrzycki, A.
Maruta, M.
Powiązania:
https://bibliotekanauki.pl/articles/298595.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Rotliegend series
Aeolian sandstones
natural gas accumulations
standard Halliburton drill stem tester
bottom hole pressure
rock permeability
Drill Stem Tester (DST)
Opis:
The presented theoretical analysis and industrial examples of interpretation of DST results for the Rotliegend series in the Polish Lowland were focused on the changes of gas productivity factor and commercial value of the analyzed horizon; permeability changes of the Rotliegend series in the wellbore area; facial changes of the Rotliegend.
Źródło:
AGH Drilling, Oil, Gas; 2015, 32, 1; 77-88
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the non-project operating modes of the gas pipeline transportation system
Autorzy:
Volynskyy, D.
Powiązania:
https://bibliotekanauki.pl/articles/298860.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Rotliegend series
Aeolian sandstones
Drill Stem Tester (DST)
natural gas accumulations
standard Halliburton drill stem tester
bottom hole pressure
rock permeability
Opis:
The paper refers to the investigation of various non-project operating modes that can occur during the operation of the gas pipeline transmission system. The only method of research is mathematical modeling since the study of accidents and emergency situations in real pipeline is unacceptable. Therefore, in order to carry out the set tasks, mathematical modeling and computer simulation of the gas pipeline system and processes that can cause accidents in its work were applied. As an object of study area was taken a hypothetical gas pipeline transportation system with the possibility to research its unsteady processes arising from the sudden closing of valves, emergency gas leak, the appearance of illegal gas extraction, connecting or disconnecting of looping etc. A mathematical model of the system is based on the classical equations of unsteady gas flow, continuity and energy together with the equation of state of a real gas, which form a closed system. Boundary value problem is selected according to the operating conditions. The obtained results allow us to generalize the findings of a significant impact of location of a gas leak or its extraction for the period of its discovery and the rate of change of the gas flow mode in the pipeline.
Źródło:
AGH Drilling, Oil, Gas; 2015, 32, 2; 335-343
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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