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Tytuł:
Nearly irreducibility of polynomials and the Newton diagrams
Autorzy:
Masternak, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/1793463.pdf
Data publikacji:
2020-01-22
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
irreducibility of polynomials
Newton diagram
Newton polygon
plane algebraic curve
Opis:
Let f be a polynomial in two complex variables. We say that f is nearly irreducible if any two nonconstant polynomial factors of f have a common zero in $C^{2}$. In the paper we give a criterion of nearly irreducibility for a given polynomial f in terms of its Newton diagram.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica; 2020, 19; 65-77
2300-133X
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
W stronę odnowionego wizerunku Newtona
Towards renovated Newtons image
Autorzy:
Rodzeń, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/690868.pdf
Data publikacji:
2019
Wydawca:
Copernicus Center Press
Tematy:
Izaak Newton
Newton as Philosopher
Mathematical Practitioners
natural philosophy
science and religion
geometry and mechanics
Isaac Newton
Opis:
Book review: Niccolò Guicciardini, Isaac Newton and Natural Philosophy, Reaktion Books, London 2018, ss. 268.
Recenzja książki: Niccolò Guicciardini, Isaac Newton and Natural Philosophy, Reaktion Books, London 2018, ss. 268.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2019, 66; 310-316
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A conjugate gradient method with quasi-Newton approximation
Autorzy:
Koko, Jonas
Powiązania:
https://bibliotekanauki.pl/articles/1208176.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Newton and quasi-Newton methods
unconstrained high-dimensional optimization
conjugate gradient methods
Opis:
The conjugate gradient method of Liu and Storey is an efficient minimization algorithm which uses second derivatives information, without saving matrices, by finite difference approximation. It is shown that the finite difference scheme can be removed by using a quasi-Newton approximation for computing a search direction, without loss of convergence. A conjugate gradient method based on BFGS approximation is proposed and compared with existing methods of the same class.
Źródło:
Applicationes Mathematicae; 2000, 27, 2; 153-165
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of rounding errors on a certain class of iterative methods
Autorzy:
Argyros, Ioannis
Powiązania:
https://bibliotekanauki.pl/articles/1208172.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Fréchet derivative
Lipschitz conditions
Newton-like method
inexact Newton-like method
Banach space
Opis:
In this study we are concerned with the problem of approximating a solution of a nonlinear equation in Banach space using Newton-like methods. Due to rounding errors the sequence of iterates generated on a computer differs from the sequence produced in theory. Using Lipschitz-type hypotheses on the mth Fréchet derivative (m ≥ 2 an integer) instead of the first one, we provide sufficient convergence conditions for the inexact Newton-like method that is actually generated on the computer. Moreover, we show that the ratio of convergence improves under our conditions. Furthermore, we provide a wider choice of initial guesses than before. Finally, a numerical example is provided to show that our results compare favorably with earlier ones.
Źródło:
Applicationes Mathematicae; 2000, 27, 3; 369-375
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Łojasiewicz exponent of the gradient of a polynomial function
Autorzy:
Lenarcik, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1294050.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
polynomial mapping
Łojasiewicz exponent
Newton diagram
Opis:
Let $h = ∑ h_{αβ} X^αY^β$ be a polynomial with complex coefficients. The Łojasiewicz exponent of the gradient of h at infinity is the least upper bound of the set of all real λ such that $|grad h(x,y)| ≥ c|(x,y)|^λ$ in a neighbourhood of infinity in ℂ², for c > 0. We estimate this quantity in terms of the Newton diagram of h. Equality is obtained in the nondegenerate case.
Źródło:
Annales Polonici Mathematici; 1999, 71, 3; 211-239
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyzwanie dla racjonalności: Leibniz i początek ery Newtona
Rationality at Stake: Leibniz and the Beginnings of Newton’s Era
Autorzy:
Heller, Michał
Powiązania:
https://bibliotekanauki.pl/articles/690808.pdf
Data publikacji:
2016
Wydawca:
Copernicus Center Press
Tematy:
rationality
empiricism
Leibniz’s philosophy
Newton’s methodology
philosophy of science
Gottfried Wilhelm Leibniz
Isaack Newton
Opis:
Our present knowledge in the field of dynamical systems, information theory, probability theory and other similar domains indicates that the human brain is a complex dynamical system working in a strong chaotic regime in which random processes play important roles. In this environment our mental life develops. To choose a logically ordered sequence from a random or almost random stream of thoughts is a difficult and energy consuming task. The only domain in which we are able to do this with a full success is mathematics. Leibniz’s life ambition was to extend this success, with the help of what he called characteristica universalis, to other areas of human activity. The belief that this is possible lies at the basis of Leibniz’s rationalist system. Reasoning within his system, Leibniz claimed that also fundamental laws of physics can be deduced from the “first principles”. Just as linguistic or conceptual units are at the basis of the charactersistica universalis, his monads are responsible for physical activity of material bodies. When this rationalistic strategy is applied to the philosophy of space and time, it leads to their radically relational conception. Leibniz’s rationalistic approach to philosophy and science arouses out sympathy but it was Newton’s mathematical-empirical method that turned out to be effective in human endeavour to understand the functioning of the physical world. Successes of the Newtonian method  compel us to revise our concept of rationality.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2016, 61; 5-22
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
‘We Make Ourselves at Home Wherever We are’1-Older Peoples Placemaking in Newton Hall
Autorzy:
van Hoven, Bettina
Douma, Linden
Powiązania:
https://bibliotekanauki.pl/articles/623609.pdf
Data publikacji:
2012-07-26
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
ageing
older people
place attachment
Newton Hall
Opis:
The aim of this paper is to explore older in-migrants' experiences and perceptions of their spatial context at the neighbourhood level, the key aspects in their attachment to the neighbourhood, and the role of place in their experience of ageing. Our qualitative research was carried out in Newton Hall (United Kingdom). The findings show that older people can have a proactive role in terms of placemaking and their own wellbeing. However, the study also reveals that the condition of the spatial context can either support or hinder older people's sense of wellbeing.
Źródło:
European Spatial Research and Policy; 2012, 19, 1
1231-1952
1896-1525
Pojawia się w:
European Spatial Research and Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wind Powered Electricity Generation Through Self Excited Induction Generator
Autorzy:
Chaturvedi, Yatender
Goel, Ankit
Powiązania:
https://bibliotekanauki.pl/articles/1075571.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Magnetic saturation
Magnetizing reactance
Newton-Raphson method
Opis:
An iterative method is used to identify the saturated magnetizing reactance and the frequency of a self-excited induction generator for given capacitance, speed, and load in a systematic way. Under steady state, this procedure is effective in analyzing such systems. A correlation has been observed between the computational algorithm results & experimental outcomes. Under steady state condition, changes in various variables have been studies and the determination of the feasibility of such system is done.
Źródło:
World Scientific News; 2019, 121; 90-100
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Chaplyghin method for first order partial differential equations
Autorzy:
Puźniakowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/255777.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
characteristics
Newton method
Chaplyghin sequences
initial problems
Opis:
Classical solutions of initial problems for nonlinear first order partial differential equations are considered. It is shown that under natural assumptions on given functions, there exist Chaplyghin sequences and they are convergent. Error estimates for approximate solutions are given. The method of characteristics is used for the construction of approximate solutions.
Źródło:
Opuscula Mathematica; 2008, 28, 2; 163-178
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-zero constant Jacobian polynomial maps of $ℂ²$
Autorzy:
Chau, Nguyen
Powiązania:
https://bibliotekanauki.pl/articles/1294068.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Jacobian conjecture
polynomial automorphism
Newton-Puiseux expansion
Opis:
We study the behavior at infinity of non-zero constant Jacobian polynomial maps f = (P,Q) in ℂ² by analyzing the influence of the Jacobian condition on the structure of Newton-Puiseux expansions of branches at infinity of level sets of the components. One of the results obtained states that the Jacobian conjecture in ℂ² is true if the Jacobian condition ensures that the restriction of Q to the curve P = 0 has only one pole.
Źródło:
Annales Polonici Mathematici; 1999, 71, 3; 287-310
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Chaplygin method for the Darboux problem
Autorzy:
Jaruszewska-Walczak, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/745871.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
functional differential equation
Newton method
analytical approximations
Opis:
In the paper we deal with the Darboux problem for hyperbolic functional differential equations. We give the sufficient conditions for the existence of the sequence \(\{z^{(m)}\}\) such that if \(\tilde{z}\) is a classical solution of the original problem then \(\{z^{(m)}\}\) is uniformly convergent to z\(\tilde{z}\). The convergence that we get is of the Newton type.
Źródło:
Commentationes Mathematicae; 2007, 47, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inexact Newton’s method for generalized operator equations in Banach spaces
Autorzy:
Singh, V. K.
Powiązania:
https://bibliotekanauki.pl/articles/122957.pdf
Data publikacji:
2018
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
nonlinear operator equation
Fréchet derivative
Newton’s method
inexact
Newton method
pochodna Frécheta
metoda Newtona
niedokładna metoda Newtona
Opis:
In the present paper, we introduce a new inexact Newton-like algorithm for solving the generalized operator equations containing non differentiable operators in Banach space setting and discuss its semilocal convergence analysis under the weak Lipschitz condition with larger convergence domain and tighter error bounds. The main result of this paper is the significant improvement over the Newton’s method as well as the inexact Newton method.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2018, 17, 4; 85-97
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oktant morski Isaaca Newtona
Isaac Newton’s marine octant
Autorzy:
Rodzeń, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2089504.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Newton Isaac
octant
navigational instruments in the 17th century
Newton Izaak
oktant
przyrządy nawigacyjne w XVII wieku
Opis:
Isaac Newton is known primarily as an outstanding mathematician and physicist. Less known are his interests in alchemy, theology, and history. Yet, we still know very little about his interest in engineering and about how he designed and created several scientific instruments (e.g. a variant of the reflecting telescope, a variant of the rotary slide rule). Among them, there is also a navigational octant built by Newton in 1699. This device is an example of an ingenious solution in the field of early modern catadioptrical instruments.
Źródło:
Kwartalnik Historii Nauki i Techniki; 2020, 65, 3; 77--94
0023-589X
2657-4020
Pojawia się w:
Kwartalnik Historii Nauki i Techniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Filozoficzny problem czasu i przestrzeni u Leibniza
Problem of Space and Time in Leibnizian Philosophy
Autorzy:
Woszczek, Marek
Powiązania:
https://bibliotekanauki.pl/articles/950204.pdf
Data publikacji:
2012-06-16
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
space
time
leibniz
newton
relational approach
absolutivist approach
Opis:
The problem of proper understanding of the space and time is one of the most enduring issues in the history of Western metaphysics. The article shows how Gottfried W. Leibniz approached them in the context of his broad relational stance in the metaphysics of nature and presents acute differences between this stance and the absolutivist-Newtonian view of space and time. Finally, some relevance of this controversy to the modern physics is pointed out.
Źródło:
Filozofia Publiczna i Edukacja Demokratyczna; 2012, 1, 1; 104-110
2299-1875
Pojawia się w:
Filozofia Publiczna i Edukacja Demokratyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Approach for Solving Intuitionistic Dual Fuzzy Nonlinear Fractional Transportation Problem
Autorzy:
Anju, A.
Anukokila, P.
Powiązania:
https://bibliotekanauki.pl/articles/1068615.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dual
Intuitionistic Fuzzy
Newton Raphson Method
Nonlinear Equations
Opis:
In this paper a new approach is explained for solving intuitionistic dual fuzzy fractional nonlinear equations. Here we have suggested a numerical method for solving a dual fuzzy nonlinear fractional equations instead of standard analytical techniques which are not suitable everywhere. Initially we wrote a dual fuzzy non-linear fractional equations in parametric form and then solve it by iterative method. An illustrative example is given to show the efficiency of our approach.
Źródło:
World Scientific News; 2019, 132; 220-232
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Gevrey orders of formal power series solutions to the third and fifth Painlevé equations near infinity
Autorzy:
Parusnikova, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/1397832.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Painleve equations
Newton polygon
asymptotic expansions
Gevrey orders
Opis:
The question under consideration is Gevrey summability of formal power series solutions to the third and fifth Painlevé equations near infinity. We consider the fifth Painlevé equation in two cases: when $\alpha\beta\gamma\delta \ne 0 $ and when $\alpha\beta\gamma \ne 0, \delta = 0$ and the third Painlevé equation when all the parameters of the equation are not equal to zero. In the paper we prove Gevrey summability of the formal solutions to the fifth Painlevé equation and to the third Painlevé equation, respectively.
Źródło:
Opuscula Mathematica; 2014, 34, 3; 591-599
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Henry More i Isaac Newton o działaniu materii – kontekst neoplatoński
Henry More and Isaac Newton on the activity of matter – neoplatonic context
Autorzy:
Kucharski, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/431181.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
Tematy:
matter
motion
active principles
God
Neoplatonism
alchemy
More Henry
Newton Isaak
materia
ruch
zasady aktywne
Bóg
neoplatonizm
alchemia
Newton Izaak
Opis:
One of the main challenges for 17th-century natural philosophers was to find an answer to the question of what makes matter active at all? The legacy of 'prime matter' and its pure potentiality was still alive, and the adoption of corpuscular or atomistic theories did not change much here, the conviction about the total passivity of bodies was still dominant. Their actions demanded some explanation that would be the equivalent of an Aristotelian, non-material and active form. It seems that one of the philosophical traditions that were sought for such an explanation was the emanational metaphysics of Plotinus. In seventeenth-century systems it underwent various modifications, but its main idea, indicating the active role of certain 'principles' or 'spirits' responsible for initiating any changes in matter and managing them in accordance with the Creator's intention, remained the foundation of the theories of matter. An example of such solutions are the systems of Henry More and his good acquaintance from Cambridge, Isaac Newton. In the first case there is no doubt about the fundamental influence of Neoplatonism, but in the second case historians' opinions are divided. Newton reaches in search of 'active principles' for alchemical research, with the hope of finding these principles not only when referring to philosophical speculations, but also to experimental methods. This difference, however, does not change the fact that both philosophers try to discover the mode of action of 'active spirits', hesitating between placing in the particles of matter a number of separate principles and pointing to only one acting universally principle that was just an extension of God's arm – More calls it the Spirit of Nature (Vicarious Power of God), and Newton sees that principle ultimately in Christ (Viceroy of God).
Jednym z głównych wyzwań stojących przed filozofami przyrody XVII wieku było znalezienie odpowiedzi na pytanie, co sprawia, że materia w ogóle działa? Dziedzictwo ‘materii pierwszej’ i jej czystej potencjalności było wciąż żywe, a przyjęcie teorii korpuskularnej czy atomistycznej niewiele tu zmieniało, dominowało wciąż przekonanie o całkowitej bierności ciał. Ich działanie domagało się jakiegoś wyjaśnienia, które stanowiłoby odpowiednik arystotelesowskiej, niematerialnej i aktywnej, formy. Wydaje się, że jedną z tradycji filozoficznych, do których sięgano w poszukiwaniu takiego wyjaśnienia, była emanacyjna metafizyka Plotyna. W systemach XVII-wiecznych ulegała ona różnorodnym modyfikacjom, ale jej główna idea, wskazująca na aktywną rolę pewnych ‘zasad’, czy ‘duchów’ odpowiedzialnych za inicjowanie wszelkich zmian w materii i kierowanie nimi zgodnie z zamysłem Stwórcy, pozostawała fundamentem ówczesnych teorii działania materii. Przykładem takich rozwiązań są systemy Henry’ego More’a i jego dobrego znajomego z Cambridge, Izaaka Newtona. W pierwszym przypadku nie ma wątpliwości co do zasadniczego wpływu neoplatonizmu, w drugim jednak zdania historyków są podzielone. Newton sięga bowiem w poszukiwaniu ‘aktywnych zasad’ do badań alchemicznych, z nadzieją odnalezienia owych zasad nie tylko przy odwołaniu się do filozoficznych spekulacji, ale także do metod eksperymentalnych. Różnica ta jednak nie zmienia faktu, że obaj filozofowie starają się odkryć sposób działania ‘duchów aktywnych’, wahając się między umieszczeniem w cząstkach materii wielu odrębnych zasad a wskazaniem na zasadę jedną, działającą uniwersalnie i będącą niejako przedłużeniem Bożego ramienia – More nazywa ją Duchem Natury (Vicarious Power of God), a Newton upatruje jej ostatecznie w Chrystusie (Viceroy of God).
Źródło:
Studia Philosophiae Christianae; 2018, 54, 4; 5-26
0585-5470
Pojawia się w:
Studia Philosophiae Christianae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new Kantorovich-type theorem for Newtons method
Autorzy:
Argyros, Ioannis
Powiązania:
https://bibliotekanauki.pl/articles/1338842.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Newton's method
Lipschitz-Hölder condition
Kantorovich hypothesis
Banach space
Opis:
A new Kantorovich-type convergence theorem for Newton's method is established for approximating a locally unique solution of an equation F(x)=0 defined on a Banach space. It is assumed that the operator F is twice Fréchet differentiable, and that F', F'' satisfy Lipschitz conditions. Our convergence condition differs from earlier ones and therefore it has theoretical and practical value.
Źródło:
Applicationes Mathematicae; 1999, 26, 2; 151-157
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization model the pipe diameter in the drinking water distribution network using multi-objective genetic algorithm
Autorzy:
Sulianto, -
Setiono, Ernawan
Yasa, I. Wayan
Powiązania:
https://bibliotekanauki.pl/articles/1844381.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
diameter
genetic algorithm
network
Newton Raphson method
optimum
pipe
Opis:
Under conditions of gravity flow, the performance of a distribution pipe network for drinking water supply can be measured by investment cost and the difference in real and target pressures at each node to ensure fairness of the service. Therefore, the objective function for the optimization in the design of a complex gravity flow pipe network is a multi-purpose equation system set up to minimize the above-mentioned two parameters. This article presents a new model as an alternative solution to solving the optimization equation system by combining the Newton–Raphson and genetic algorithm (GA) methods into a single unit so that the resulting model can work effectively. The Newton–Raphson method is used to solve the hydraulic equation system in pipelines and the GA is used to find the optimal pipe diameter combination in a network. Among application models in a complex pipe network consisting of 12 elements and 10 nodes, this model is able to show satisfactory performance. Considering variations in the value of the weighting factor in the objective function, opti-mal conditions can be achieved at the investment cost factor (ω1) = 0.75 and the relative energy equalization factor at the service node (ω2) = 0.25. With relevant GA input parameters, optimal conditions are achieved at the best fitness value of 1.016 which is equivalent to the investment cost of USD 56.67 thous. with an average relative energy deviation of 1.925 m.
Źródło:
Journal of Water and Land Development; 2021, 48; 55-64
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Load flow and contingency analysis for transmission line outage
Autorzy:
Aeggegn, Dessalegn Bitew
Salau, Ayodeji Olalekan
Gebru, Yalew
Powiązania:
https://bibliotekanauki.pl/articles/140622.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
contingency analysis
DIgSILENT software
line outage
Newton Raphson method
Opis:
In recent years, power systems have been pushed to operate above their limits due to the increase in the demand for energy supply and its usage. This increase is accompanied by various kinds of obstructions in power transmission systems. A power system is said to be secured when it is free from danger or risk. Power systems security deals with the ability of the system to withstand any contingencies without any consequences. Contingencies are potentially harmful disturbances which occur during the steady state operation of a power system. Load flow constitutes the most important study in a power system for planning, operation, and expansion. Contingency selection is performed by calculating two kinds of performance indices; an active performance index (PIP) and reactive power performance index (PIV) for a single transmission line outage. In this paper, with the help of the Newton Raphson method, the PIP and PIV were calculated with DIgSILENT Power Factory simulation software and contingency ranking was performed. Based on the load flow results and performance indexes, the Ethiopian Electric Power (EEP) North-West region network is recommended for an upgrade or the reactive power or series compensators should be constructed on the riskiest lines and substations.
Źródło:
Archives of Electrical Engineering; 2020, 69, 3; 581-594
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control of partial differential equations with affine control constraints
Autorzy:
Reyes, J. R. de los
Kunisch, K.
Powiązania:
https://bibliotekanauki.pl/articles/1839187.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal control
affine control constraints
semi-smooth Newton methods
Opis:
Numerical solution of PDE optimal control problems involving affine pointwise control constraints is investigated. Optimality conditions are derived and a semi-smooth Newton method is presented. Global and local superlinear convergence of the method are obtained for linear problems. Differently from box constraints, in the case of general affine constraints a proper weighting of the control costs is essential for superlinear convergence of semi-smooth Newton methods. This is also demonstrated numerically by controlling the two-dimensional Stokes equations with different kinds of affine constraints.
Źródło:
Control and Cybernetics; 2009, 38, 4A; 1217-1249
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kant a Newton (z perspektywy Opus postumum)
Kant and Newton (From the Perspective of Opus Postumum)
Autorzy:
Kupś, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/423403.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
Tematy:
Kant
Newton
progress of science
chemistry
postęp nauki
chemia
Opis:
Kant’s attitude towards Newton is ambiguous though he owes much to him. Although Newton’s physics is a paradigm of science for Kant, he is fully aware that few appearances occur accurately according to the way described by mechanics. When he ties the principles of his philosophy with Newton’s mechanics, Kant makes a mistake, for due to the development of knowledge it began losing its absolute position in science in his day. In Opus postumum Kant recognizes the mistake and no longer refers to the rules of Metaphysische Anfangsgründe der Naturwissenschaft as the ultimate ones. Till the beginning of his work on Opus postumum Newtonian mechanics was a paradigm of science for Kant. It ceases to be so in Opus postumum, where Newton is present mainly as the object of Kant’s polemics. The progress of science, new phenomena, new methods, the development of chemistry. In Metaphysische Anfangsgründe der Naturwissenschaft chemistry was not referred to as science (since it was Newton’s mechanics that was the paradigm of science), whereas in Metaphysik der Sitten (1797) Kant defines Lavoisier’s chemistry as the only chemistry [AA VI 207]; in Anthropologie [AA VII 326] (1798) he ranks Lavoisier as high as Archimedes and Newton. New main problems appeared science which had to deal with: combustibility, origin of acids, the change of the state of matter, electricity, magnetism and – first of all – theory of heat. The main notion of the new theory of chemistry developed by Lavoisier (ether, the caloric) takes the central position also in Kant’s theory of transition (Übergang).
Źródło:
IDEA. Studia nad strukturą i rozwojem pojęć filozoficznych; 2015, 27/t.t.; 203-220
0860-4487
Pojawia się w:
IDEA. Studia nad strukturą i rozwojem pojęć filozoficznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Krótka historia Principiów Newtona
A Short History of Newton’s Principia
Autorzy:
Pabjan, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/691280.pdf
Data publikacji:
2012
Wydawca:
Copernicus Center Press
Tematy:
history of science
Isaack Newton
Philosophiae Naturalis Principia Mathematica
Opis:
The Polish translation of the most famous treatise of Newton has just been published, which is a good opportunity to recall some of the episodes related to the origin of Principia. In the first part of this three piece paper, the historical context is presented, in which unsolved scientific problems – specially those of planetary motions – were discussed before Newton; in the second part, the circumstances of the process of the writing of the Principia are outlined; in the third part, some facts are recalled which show that not all scientists and philosophers at once recognized the value and the importance of Newton’s treatise. Finally, some remarks on the Polish edition are made.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2012, 50; 102-117
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ zmiennego w czasie obciążenia zewnętrznego na parametry elastohydrodynamicznego (EHD) izotermicznego filmu olejowego
Influence of variable external load on the parameters of the isothermal elastohydrodynamic (EHD) oil film
Autorzy:
Buchalski, K.
Powiązania:
https://bibliotekanauki.pl/articles/311345.pdf
Data publikacji:
2013
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
film EHD
metoda Newtona-Raphsona
EHD film
Newton-Raphson method
Opis:
W artykule przedstawiono metodykę rozwiązania zagadnienia wpływu zmiennego w czasie obciążenia zewnętrznego na parametry izotermicznego (EHD) filmu, takie jak: rozkład ciśnienia i grubość filmu olejowego na długości strefy kontaktu. Rozpatrywany kontakt jest liniowym stykiem skoncentrowanym dwóch walców oddzielonych warstwą smaru. W wyniku badań otrzymano rozkłady ciśnienia i grubości filmu olejowego w funkcji zmian częstotliwości obciążenia zewnętrznego.
This paper presents the methodology of solving the problem of variable external load which influence on the parameters of the isothermal (EHD) oil film such as pressure distribution and thickness of the oil film on the length of the contact zone. Contact is considered a concentrated line contact between two cylinders separated by a layer of grease. As a result of research received: pressure distributions and obtained oil film thickness as a function of the frequency change of the external load.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2013, 14, 3; 1575-1583
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Actual picture of the law of universal gravitation and the quantum gravity theory describing the real state of the universe
Autorzy:
Borowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/412595.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
classical gravity theory
quantum gravity theory
dark matter
Copernicus
Newton
Opis:
This paper presents the real sense of the classical and quantum theory of gravitation as a component of the actual picture of the universe where the volume, as the size of the expanding universe, approaches infinity, while the total of material masses goes to zero. At present, these two standard theories describe the phenomenon of gravitation but do not explain the very mechanism and the cause of this process. This constant and real lack of information on that subject is consistent with natural laws and the same with the laws of physics, which were already experimentally determined by Werner Heisenberg in 1927. The paper also presents the causes of inability to explain up to the present the actual picture of the essence of the universe.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 11; 44-53
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 92

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