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Wyświetlanie 1-15 z 348
Tytuł:
Holomorphic non-holonomic differential systems on complex manifolds
Autorzy:
Dimiev, S.
Powiązania:
https://bibliotekanauki.pl/articles/1312446.pdf
Data publikacji:
1991
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
power -expansion
Opis:
We study coherent subsheaves of the holomorphic tangent sheaf of a complex manifold. A description of the corresponding -stable ideals and their closed complex subspaces is sketched. Our study of non-holonomicity is based on the Noetherian property of coherent analytic sheaves. This is inspired by the paper [3] which is related with some problems of mechanics.
Źródło:
Annales Polonici Mathematici; 1991, 55, 1; 65-73
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Successive derivatives and finite expansions involving the H-function of one and more variables
Autorzy:
Joshi, C.
Joshi, N.
Powiązania:
https://bibliotekanauki.pl/articles/1294694.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
H-function of several variables
differential operator
expansion formulas
Appell functions
Lauricella functions
Kampé de Fériet function
generalized hypergeometric functions
Opis:
Certain results including the successive derivatives of the H-function of one and more variables are established. These remove the limitations of Ławrynowicz's (1969) formulas and as a result extend the results of Skibiński [13] and various other authors. As an application some finite expansion formulas are also established, which reduce to hypergeometric functions of one and more variables that are of common interest.
Źródło:
Annales Polonici Mathematici; 1997, 67, 1; 15-29
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent and strong expansions of spaces coincide
Autorzy:
Mardešić, Sibe
Powiązania:
https://bibliotekanauki.pl/articles/1205303.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
coherent expansion
coherent homotopy
inverse system
strong expansion
strong shape
Opis:
In the existing literature there are several constructions of the strong shape category of topological spaces. In the one due to Yu. T. Lisitsa and S. Mardešić [LM1-3] an essential role is played by coherent polyhedral (ANR) expansions of spaces. Such expansions always exist, because every space admits a polyhedral resolution, resolutions are strong expansions and strong expansions are always coherent. The purpose of this paper is to prove that conversely, every coherent polyhedral (ANR) expansion is a strong expansion. This result is obtained by showing that a mapping of a space into a system, which is coherently dominated by a strong expansion, is itself a strong expansion.
Źródło:
Fundamenta Mathematicae; 1998, 158, 1; 69-80
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On extensions of the Mittag-Leffler theorem
Autorzy:
Ligocka, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/1294436.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
hyperfunction
Laurent expansion
elliptic
polyharmonic
hypoelliptic
P-convex for supports
Opis:
The classical Mittag-Leffler theorem on meromorphic functions is extended to the case of functions and hyperfunctions belonging to the kernels of linear partial differential operators with constant coefficients.
Źródło:
Annales Polonici Mathematici; 1998, 68, 3; 249-256
0066-2216
Pojawia się w:
Annales Polonici Mathematici
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:
Topological derivative for optimal control problems
Autorzy:
Sokołowski, J.
Żochowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/206790.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sterowanie optymalne
asymptotic expansion
control problems
shape derivative
shape optimization
topological derivative
Opis:
The topological derivative is introduced for the extremal values of cost functionals for control problems. The optimal control problem considered in the paper is defined for the elliptic equation which models the deflection of an elastic membrane. The derivative measures the sensitivity of the optimal value of the cost with respect to changes in topology. A change in topology means removing a small ball from the interior of the domain of integration. The topological derivative can be used for obtaining the numerical solutions of the shape optimization problems.
Źródło:
Control and Cybernetics; 1999, 28, 3; 611-625
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expansion of a cylindrical cavity in sand
Autorzy:
Osinov, V. A.
Cudmani, R.
Powiązania:
https://bibliotekanauki.pl/articles/1954562.pdf
Data publikacji:
2000
Wydawca:
Politechnika Gdańska
Tematy:
cavity expansion
sand
hypoplasticity
critical state
Opis:
The paper presents numerical solution to the problem of the symmetri quasi-static large-strain expansion of a cylindrical cavity in sand. The boundary value problem is solved with the use of a constitutive equation of hypoplasticity calibrated for a particular sand. As the radius of the cavity increases, the stresses and the density on the cavity surface asymptotically approach limit values which correspond to a so-called critical state of the sand. The limit values depend on the initial stresses and the initial density. The solutions are compared with experimental results for the same sand available in the literature. A comparison is also made with numerical solutions obtained by other authors.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 3; 421-437
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite-Dimensional Control of Nonlinear Parabolic Pde Systems With Time-Dependent Spatial Domains Using Empirical Eigenfunctions
Autorzy:
Armaou, A.
Christofides, P. D.
Powiązania:
https://bibliotekanauki.pl/articles/908332.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sterowanie nieliniowe
sterowanie skończenie wymiarowe
Karhunen-Loeve expansion
Galerkin's method
nonlinear control
diffusion-reaction processes with moving boundaries
Opis:
This article presents a methodology for the synthesis of finite-dimensional nonlinear output feedback controllers for nonlinear parabolic partial differential equation (PDE) systems with time-dependent spatial domains. Initially, the nonlinear parabolic PDE system is expressed with respect to an appropriate time-invariant spatial coordinate, and a representative (with respect to different initial conditions and input perturbations) ensemble of solutions of the resulting time-varying PDE system is constructed by computing and solving a high-order discretization of the PDE. Then, the Karhunen-Loeve expansion is directly applied to the ensemble of solutions to derive a small set of empirical eigenfunctions (dominant spatial patterns) that capture almost all the energy of the ensemble of solutions. The empirical eigenfunctions are subsequently used as basis functions within a Galerkin model reduction framework to derive low-order ordinary differential equation (ODE) systems that accurately describe the dominant dynamics of the PDE system. The ODE systems are subsequently used for the synthesis of nonlinear output feedback controllers using geometric control methods. The proposed control method is used to stabilize an unstable steady-state of a diffusion-reaction process with nonlinearities, spatially-varying coefficients and time-dependent spatial domain, and is shown to lead to the construction of accurate low-order models and the synthesis of low-order controllers. The performance of the low-order models and controllers is successfully tested through computer simulations.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2001, 11, 2; 287-317
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern human origins and prehistoric demography of Europe in light of the present-day genetic diversity
Autorzy:
Zietkiewicz, E
Powiązania:
https://bibliotekanauki.pl/articles/2048309.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
European migration
human genetics
demography
phylogeography
demographic expansion
frequency distribution
population diversity
human evolution
Europe
Źródło:
Journal of Applied Genetics; 2001, 42, 4; 509-530
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymptotics of two-dimensional copulas
Autorzy:
Jaworski, P.
Powiązania:
https://bibliotekanauki.pl/articles/747908.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Two-dimensional copulas, homogeneous expansion, modelling risk
Opis:
Artykuł nie zawiera streszczenia
The paper deals with simple properties of two-dimensional copulas. The focus is on particular cases when a copula has a homogeneous expansion of the lower tail. Properties of the corresponding main part are studied. For particular cases of copulas the main parts are calculated and possible applications in modelling risk are discussed.
Źródło:
Mathematica Applicanda; 2003, 31, 45/04
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Swelling, expansion and shrinkage properties of selected clays in the Mazowsze province, central Poland
Autorzy:
Pająk-Komorowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/2059631.pdf
Data publikacji:
2003
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
tertiary clay
tills
swelling
expansion
shrinkage
Opis:
Tertiary clays and tills, the most widespread soils in Poland, were used for the examination of swelling, expansion and shrinkage properties. Results of laboratory tests and the values of selected parameters obtained by indirect methods show that the Tertiary clays examined, when compared with Quaternary tills, show greater volumetric changes under the influence of water, which is primarily connected with their higher silt content.
Źródło:
Geological Quarterly; 2003, 47, 1; 55-62
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tree-like isometric subgraphs of hypercubes
Autorzy:
Brešar, Bostjan
Imrich, Wilfried
Klavžar, Sandi
Powiązania:
https://bibliotekanauki.pl/articles/743405.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
isometric embeddings
partial cubes
expansion procedures
trees
median graphs
graph automorphisms
automorphism groups
dismantlable graphs
Opis:
Tree-like isometric subgraphs of hypercubes, or tree-like partial cubes as we shall call them, are a generalization of median graphs. Just as median graphs they capture numerous properties of trees, but may contain larger classes of graphs that may be easier to recognize than the class of median graphs. We investigate the structure of tree-like partial cubes, characterize them, and provide examples of similarities with trees and median graphs. For instance, we show that the cube graph of a tree-like partial cube is dismantlable. This in particular implies that every tree-like partial cube G contains a cube that is invariant under every automorphism of G. We also show that weak retractions preserve tree-like partial cubes, which in turn implies that every contraction of a tree-like partial cube fixes a cube. The paper ends with several Frucht-type results and a list of open problems.
Źródło:
Discussiones Mathematicae Graph Theory; 2003, 23, 2; 227-240
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geopolitical essence of Central Europe in writings of Eugeniusz Romer
Autorzy:
Jędrzejczyk, Dobiesław
Mikulska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2029407.pdf
Data publikacji:
2004-06-01
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
geopolitics
transitional situation
bridge-like situation
territorial expansion
natural and political borders
Opis:
Eugeniusz Romer maintained that the notion of Central Europe, introduced at the end of the 19th century by German geographers was of a distinct geopolitical character. The thesis that Poland is situated in a transitional zone between the Western and the Eastern Europe denies Poland the right to an independent political existence. Romer's opinion was that the location of Poland is characterised by its bridge-like situation between the Baltic and the Black Seas. This location determines the geopolitical identity of Poland as well as its rights to independence. Romer's arguments, supported by cartographic, demographic and ethnographic research became the basis for the determination of the area and the borders of Poland at the peace conference in Paris (1919 - 1920).
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2004, 11; 199-206
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lata "wskaźnikowe" i "wyjątkowe" w ocenie związków "przyrost radialny-klimat"
The pointer and exceptional years in assessment of relationships "radial growth-climate"
Autorzy:
Wilczyński, S.
Powiązania:
https://bibliotekanauki.pl/articles/1023609.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lata wskaznikowe
sloje przyrostu rocznego
warunki klimatyczne
sosna zwyczajna
lesnictwo
lata wyjatkowe
Pinus sylvestris
drzewa lesne
dendroklimatologia
osmunda regalis
distribution
expansion
population structure
protection
Opis:
The article presents the results of study on Osmunda regalis L. population number increase during the last 35 years (1964−2001) as a consequence of the cattle grazing decline. The number of Osmunda regalis specimens increased from 15 individuals in the year 1964 to 194 (increase by about 1190%). Passive and active forms of royal fern protection are proposed.
Źródło:
Sylwan; 2004, 148, 05; 30-40
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 348

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