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Wyświetlanie 1-15 z 51
Tytuł:
Systems of variational inequalities related to economic equilibrium
Autorzy:
Naniewicz, Z.
Nockowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/970931.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimization problem
variational inequalities
duality
Opis:
In the paper a new approach to the Walrasian general equilibrium model of economy is presented. The classical market clearing condition is replaced by suitably formulated variational inequality. It states that the market clears for a commodity if its equilibrium price is positive; otherwise, there may be an excess supply of the commodity in equilibrium and then its price is zero. Such approach enables establishing new existence results without assumptions which were fundamental for the currently used methods: (i) Dis-utility functions are not required to be strictly convex and they may attain their minima in the consumption sets (the local nonsatiation of preferences is not required). (ii) The boundary of the positive orthant is allowed for the price vector in equilibrium. It allows for investigation of certain new problems, e.g. bankruptcy conditions.
Źródło:
Control and Cybernetics; 2007, 36, 4; 889-909
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On duality of submodule lattices
Autorzy:
Czédli, Gábor
Takách, Géza
Powiązania:
https://bibliotekanauki.pl/articles/728870.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
submodule lattice
lattice identity
duality
Opis:
An elementary proof is given for Hutchinson's duality theorem, which states that if a lattice identity λ holds in all submodule lattices of modules over a ring R with unit element then so does the dual of λ.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2000, 20, 1; 43-49
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Longitudinal shearing of elastic-plastic fibrous composite with frictional fibre-matrix interface
Podłużne ścinanie sprężyso-plastycznego kompozytu włóknistego z uwzględnieniem tarcia na powierzchniach włókien
Autorzy:
Więckowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/281355.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
homogenisation
finite element method
duality
Opis:
The problem of macroscopic behaviour of periodic, elastic-plastic, fibrous composite material with frictional fibre-matrix interface is considered. Anti-plane shear of the material is analysed. The problem is formulated with the help of variational inequalities using the two approaches: displacement-based and stress-based ones. The variational inequalities are solved using the finite element method. In the case of stress-based approach, the Prandl stress function is utilized. The obtained effective constitutive model of the composite can be used directly in analysis of the problem of torsion of a composite bar with a fine, periodic structure.
W pracy rozważono zagadnienie efektywnych własności periodycznego, sprężysto-plastycznego kompozytu włóknistego, poddanego stanowi anty-płaskiego ścinania, uwzględniając zjawisko tarcia na powierzchni łączącej włókno i matrycę. Zagadnienie zostało sformułowane w przemieszczeniach i naprężeniach w postaci nierówności wariacyjnych, które rozwiązano za pomocą metody elementów skończonych. W przypadku sformułowania naprężeniowego zastosowano funkcje naprężeń Prandtla. Otrzymane efektywne związki konstytutywne dla rozważanego kompozytu mogą być bezpośrednio wykorzystane w analizie zagadnienia swobodnego skręcania pręta kompozytowego o periodycznej strukturze włóknistej.
Źródło:
Journal of Theoretical and Applied Mechanics; 1998, 4; 854-877
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Пространства Марины Цветаевой
Marina Tsvetaeva’s spaces
Autorzy:
Voitekhovich, Roman
Powiązania:
https://bibliotekanauki.pl/articles/1837556.pdf
Data publikacji:
2021-10-14
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Tsvetaeva
space
duality
number
composition
Opis:
The hallmarks of space in Tsvetaeva’s poetic world are vertical orientation, two-worldness (many-worldness), measurability, and “immensity”, often expressed by asymmetry. Tsvetaeva’s model of the double world is presented both in its pure form and in a multilayer one (the model of “matryoshka” according to Lotman) with a hierarchical vertical correlation of spaces. The vertical sets the plots, stylistics, system of characters, system of time and expectations of the reader. Tsvetaeva is a bright representative of irrational tendencies in art, which manifest themselves against the background of rational ones, through their violation. Thus, The Attempt of a Room (1926) builds on an imaginary effort to present a hexagonal box of a rendezvous, but fails. The last poem I Keep Repeating the First Verse… (1940) is a poetic reaction to the “mistake in counting”: there should be not six but seven souls at the table. In one of her poems, Tsvetaeva calls herself “one who has edited the miracle with numbers”. This formula aphoristically expresses the nature of creativity asfirst intuitive search, and then rational design. The mathematical calculation of the composition of her books is an analogue of the metric-stanzaic “frame” of her lyrics. In the given proportions she often uses a deliberate failure by one unit (for example, in the collection From Two Books she adds one extra poem, which was originally missing in these two books).
Źródło:
Studia Rossica Posnaniensia; 2021, 46, 2; 27-49
0081-6884
Pojawia się w:
Studia Rossica Posnaniensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific duality and stability of positive electrical circuits
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/140721.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
duality
positive
electrical circuit
linear
stability
Opis:
The specific duality and asymptotic stability of the positive linear electrical circuits are addressed. The specific duality of positive linear electrical circuits composed of resistances, inductances, capacitances and source voltages is established. 1) The linear electrical circuits are positive if and only if the common branches between meshes with resistances and inductances and meshes with resistances and capacitances contain only source voltages; 2) In linear electrical circuits the interchanges of the inductances by the capacitances and the capacitances by inductances do not change the asymptotic stability of the electrical circuits. The asymptotic stability of the positive and nonpositive electrical circuits is analyzed.
Źródło:
Archives of Electrical Engineering; 2017, 66, 4; 663-679
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized α-V-univex functions for multiobjective variational control problems
Autorzy:
Sharma, S.
Choudhury, S.
Jayswal, A.
Powiązania:
https://bibliotekanauki.pl/articles/206848.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
control problem
α-V-univexity
efficiency
sufficiency
duality
Opis:
The purpose of this paper is to introduce a new class of _-V-univex/ generalized _-V-univex functions for a class of multiobjective variational control problems. Moreover, sufficient optimality conditions and Mond-Weir type duality results, associated with the multiobjective variational control problem, are established under aforesaid assumptions.
Źródło:
Control and Cybernetics; 2014, 43, 3; 403-420
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The domination over time and its discretisation
Autorzy:
Abbasnezhad, Nazanin
Mehri-Takmeh, Javad
Vakili, Javad
Powiązania:
https://bibliotekanauki.pl/articles/406615.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
domination over time
continuous linear programming
duality
discretisation
Opis:
Domination in graphs is well known and has been an extensively researched branch of graph theory. Since the variation over time is one of the important properties of real-world networks, we study the influence of time on the domination problem. In this paper, we introduce the domination over time problem, including time delay on arcs. Then, an optimal solution to its discretisation is obtained, which is the solution of the original problem.
Źródło:
Operations Research and Decisions; 2020, 30, 1; 5-24
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sufficient optimality condition and duality of nondifferentiable minimax ratio constraint problems under (p, r)-ρ-(η, θ)-invexity
Autorzy:
Kailey, Navdeep
Sethi, Sonali
Saini, Shivani
Powiązania:
https://bibliotekanauki.pl/articles/2183486.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
minimax fractional programming
optimality conditions
duality
generalized invexity
Opis:
There are several classes of decision-making problems that explicitly or implicitly prompt fractional programming problems. Portfolio selection problems, agricultural planning, information transfer, numerical analysis of stochastic processes, and resource allocation problems are just a few examples. The huge number of applications of minimax fractional programming problems inspired us to work on this topic. This paper is concerned with a nondifferentiable minimax fractional programming problem. We study a parametric dual model, corresponding to the primal problem, and derive the sufficient optimality condition for an optimal solution to the considered problem. Further, we obtain the various duality results under (p, r)-ρ-(η, θ)-invexity assumptions. Also, we identify a function lying exclusively in the class of (−1, 1)-ρ-(η, θ)- invex functions but not in the class of (1,−1)-invex functions and convex function already existing in the literature. We have given a non-trivial model of nondifferentiable minimax problem and obtained its optimal solution using optimality results derived in this paper.
Źródło:
Control and Cybernetics; 2022, 51, 1; 71--88
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
(k,l)-kernels, (k,l)-semikernels, k-Grundy functions and duality for state splittings
Autorzy:
Galeana-Sánchez, Hortensia
Gómez, Ricardo
Powiązania:
https://bibliotekanauki.pl/articles/743799.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
state splitting
line digraph
kernel
Grundy function
duality
Opis:
Line digraphs can be obtained by sequences of state splittings, a particular kind of operation widely used in symbolic dynamics [12]. Properties of line digraphs inherited from the source have been studied, for instance in [7] Harminc showed that the cardinalities of the sets of kernels and solutions (kernel's dual definition) of a digraph and its line digraph coincide. We extend this for (k,l)-kernels in the context of state splittings and also look at (k,l)-semikernels, k-Grundy functions and their duals.
Źródło:
Discussiones Mathematicae Graph Theory; 2007, 27, 2; 359-371
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Managerial Entrenchment and Firm Performance: Evidence from Moroccan Listed Companies
Autorzy:
Bousetta, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/1934174.pdf
Data publikacji:
2021
Wydawca:
Akademia Leona Koźmińskiego w Warszawie
Tematy:
managerial entrenchment
CEO ownership
duality
CEO characteristics
firm performance
Opis:
Purpose: Grounded in agency and entrenchment theories, this study assumes that CEOs’ propensity to entrench themselves can affect firm performance. The purpose of this article is to investigate the relationship between dimensions and mechanisms through which managers entrench themselves and influence firm performance. Design/methodology/approach: The article uses OLS regression to explain the assumed relationships between managerial entrenchment and firm performance. The study is based on a sample of 55 Moroccan listed companies over the period 2010–2015. Findings: Taken together, the findings contribute to a better understanding of the effect of several entrenchment pathways on firm performance. These findings imply that managerial entrenchment is not necessarily detrimental, as suggested by some governance theories. On the contrary, it can have a beneficial effect on wealth creation. Research limitations/implications: This study faces several limitations. The first appears in the sample size of its quantitative element. The second is related to the variables used to measure managerial entrenchment. The current research explores the effects of the most commonly used measures and some non-retained measures could be pertinent in verifying the assumed relationships. Originality/value: This analysis is one of the few studies conducted in the African countries that scrutinize the impact of managers’ entrenchment determinants (ownership, duality, age, and tenure) on firm performance
Źródło:
Central European Management Journal; 2021, 29(3); 40-62
2658-0845
2658-2430
Pojawia się w:
Central European Management Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimality conditions and a classification of duality schemes in vector optimization
Autorzy:
El Ghali, B.
Powiązania:
https://bibliotekanauki.pl/articles/205741.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
dwoistość
optymalizacja wektorowa
duality
existential solutions
minimality
vector optimization
Opis:
Vector minimization of a relation F valued in an ordered vector space under a constraint A consists in finding x[0] belongs to A, w[0] belongs to Fx[0] such that w[0] is minimal in FA. To a family of vector minimization problems minimize[x belongs to X] F(x, y), y [belongs to] Y, one associates a Lagrange relation [L(x, [xi], y[0]) = union of sets y belongs to Y(F(x, y)-xi(y)+(y[0]))] where [xi] belongs to an arbitrary class [Xi] of mappings. For this type of problem, there exist several notions of solutions. Some useful characterizations of existential solutions are established and, consequently, some necessary conditions of optimality are derived. One result of intermediate duality is proved with the aid of the scalarization theory. Existence theorems for existential solutions are given and a comparison of several exact duality schemes is established, more precisely in the convex case it is shown that the majority of exact duality schemes can be obtained from one result of S. Dolecki and C. Malivert.
Źródło:
Control and Cybernetics; 2000, 29, 4; 839-860
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poziomy funkcjonowania dychotomii w filmie Wygnanie Andrieja Zwiagincewa
Levels of dichotomy in The Banishment by Andrei Zvyagintsev
Autorzy:
Przybysz, Anna
Powiązania:
https://bibliotekanauki.pl/articles/915953.pdf
Data publikacji:
2018-12-20
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
dichotomy
duality
doppelganger
Andrei Zvyaginstev
The Banishment
artistic method
Opis:
The aim of this article is to show how the levels of dichotomy function in the artistic world of The Banishment, directed by Andrei Zvyagintsev. We try to put emphasis on the Zvyagintsev’s artistic method, to show that said idea works on several levels. We are convinced that the idea of duality is present in The Banishment as externally (for example motif of split in the family) as well as internally (the category of the doppelgänger).
Źródło:
Kultury Wschodniosłowiańskie – Oblicza i Dialog; 2018, 8; 135-146
2391-470X
Pojawia się w:
Kultury Wschodniosłowiańskie – Oblicza i Dialog
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wojna i pokój – dualizm świata w powieści Zachara Prilepina Patologie
War and peace - the duality of the world in the novel of Zakhar Prilepin Pathologies
Autorzy:
Borkowska, Aldona
Powiązania:
https://bibliotekanauki.pl/articles/1811323.pdf
Data publikacji:
2019-12-10
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Prilepin
wojna
Czeczenia
dualizm
Patologie
war
Chechnya
duality
Pathologies.
Opis:
Debiutancka powieść Zachara Prilepina Patologie to pierwsze pozycja literatury pięknej opisująca wojnę w Czeczenii, przy czym z perspektywy uczestnika wydarzeń. Główny bohater, Jegor Taszewski, to alter ego pisarza. Kompozycja utworu oparta jest na trzech liniach: wspomnieniach protagonisty z dzieciństwa, historii jego związku z ukochaną oraz opisie wydarzeń i przeżyć wojennych. W powieści rysuje się podwójny obraz świata, uzyskany nie tylko dzięki połączeniu obecnych zdarzeń ze reminiscencjami z czasów pokoju jako dwóch części życia jednego człowieka. Mamy tu do czynienia z kontrastem brutalności ze zmysłowością, sacrum  przeplata się z profanum, rozmowy o Bogu mieszają z opisami żołnierskich problemów żołądkowych. Celem artykułu jest pokazanie ambiwalencji świata w powieści, stawiającej w opozycji piękno i brzydotę, śmiech i powagę, życie i śmierć, wielkość i nikczemność.
The first novel by Zakhar Prilepin Pathologies is the first literary work describing the war in Chechnya, written by a participant in the events. The main character, Jegor Taszewski, is the alter ego of the writer. The composition of the book is based on three lines: the memories of the protagonist's childhood, the story of his relationship with his beloved Dasha, and the description of the events and experiences of war. A double image of the world, not only achieved by a combination of current events with reminiscences from the times of peace as two parts of the life of one man, is shown in the novel. We are dealing with a brutal contrast with sensuality, sacred mixes with profane, talks about God adjacent descriptions of soldier diarrhea. This article aims to show the ambivalence of the world in the novel, putting in opposition beauty and ugliness, laughter and seriousness, life and death, greatness and wickedness.
Źródło:
DOCTRINA. Studia Społeczno-Polityczne; 2017, 14, 14; 5-17
1730-0274
Pojawia się w:
DOCTRINA. Studia Społeczno-Polityczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
"Fargo" braci Coenów jako lekcja świadomego, analitycznego podejścia do interpretacji dualizmu faktu i fikcji w amerykańskiej narracji filmowej
The Coen brothers’ "Fargo" as a lesson in conscious, analytical approach to interpreting the duality of fact and fiction behind an american cinematic narrative
Autorzy:
Ligor, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/540708.pdf
Data publikacji:
2014
Wydawca:
Mazowiecka Uczelnia Publiczna w Płocku
Tematy:
postmodernism
fiction
fact
duality
parody
the Western
Paul Bunyan
Opis:
In "Fargo" Joel and Ethan Coen deliberately blur the distinction between fiction and non-fiction by manipulating their audiences into believing they have been faced with an almost documentary account of real events. For the perceptive viewer, however, the film’s guise of realism soon turns out to be yet another manifestation of the brothers’ inclination towards extreme stylization of their pictures. The duality of fact and fiction is reinforced by the film’s title which cleverly undermines the city’s significance for American history as well as the subversion of the traditional Western film iconography and the deconstruction of the pivotal national myth of Paul Bunyan. The technique of tall tale deployed by the directors intent on frustrating their audiences’ expectations not only closely parallels certain strategies of postmodernist literature keen to destabilize the ontological boundary between the realm of fiction and the real world but also conveys the grotesque sense of the vacuousness of the nation’s moral, social and cultural environment, which becomes evident after deciphering the picture’s numerous deceptions and duplicities by applying a conscious, analytical approach to its interpretation.
Źródło:
Społeczeństwo. Edukacja. Język; 2014, 2; 135-140
2353-1266
2449-7983
Pojawia się w:
Społeczeństwo. Edukacja. Język
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonconvex minimization related to quadratic double-well energy - approximation by convex problemsenergy – approximation by convex problems
Autorzy:
Naniewicz, Z.
Puchała, P.
Powiązania:
https://bibliotekanauki.pl/articles/205686.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
nonconvex integrand
minimum of convex functions
duality
parameterized Young measures
Opis:
A double-well energy expressed as a minimum of two quadratic functions, called phase energies, is studied taking into account minimization of the corresponding integral functional. Such integral, as being not sequentially weakly lower semicontinuous, does not admit classical minimizers. To derive the relaxation formula for the infimum, the appropriate minimizing sequence is constructed. It consists of solutions of some approximating convex problems involving characteristic functions related to the phase energies. The weak limit of this sequence and the weak limit of the sequence of solutions of dual problems combined with the weak-star limits of the characteristic functions related to the phase energies allow to establish the final relaxation formula. It is also shown that infimum can be expressed by the Young measure associated with constructed minimizing sequence. An explicit form of Young measure in some regions of the involved domain is calculated.
Źródło:
Control and Cybernetics; 2012, 41, 3; 525-543
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 51

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