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Wyświetlanie 1-10 z 36
Tytuł:
On the dependence of the orthogonal projector on deformations of the scalar product
Autorzy:
Pasternak-Winiarski, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/1218586.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
scalar product
orthogonal projector
dependence of projectors on scalar products
Opis:
We consider scalar products on a given Hilbert space parametrized by bounded positive and invertible operators defined on this space, and orthogonal projectors onto a fixed closed subspace of the initial Hilbert space corresponding to these scalar products. We show that the projector is an analytic function of the scalar product, we give the explicit formula for its Taylor expansion, and we prove some algebraic formulas for projectors.
Źródło:
Studia Mathematica; 1998, 128, 1; 1-17
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Méthodes de réalisation de produit scalaire et de problème de moments avec maximisation dentropie
Autorzy:
Girardin, Valerie
Powiązania:
https://bibliotekanauki.pl/articles/1219610.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
moments
scalar product
entropy maximization
Opis:
We develop several methods of realization of scalar product and generalized moment problems. Constructions are made by use of a Hilbertian method or a fixed point method. The constructed solutions are rational fractions and exponentials of polynomials. They are connected to entropy maximization. We give the general form of the maximizing solution. We show how it is deduced from the maximizing solution of the algebraic moment problem.
Źródło:
Studia Mathematica; 1997, 124, 3; 199-213
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Scale Structure of Moral Adjectives
Autorzy:
Faroldi, Federico L.G.
Soria Ruiz, Andrés
Powiązania:
https://bibliotekanauki.pl/articles/561248.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Semiotyczne
Tematy:
moral adjectives
scalar semantics
multidimensionality
meta-ethics
Opis:
In this paper we discuss how and whether moral adjectives fit a well-known semantics for gradable adjectives. We first test whether moral adjectives are relative or absolute adjectives. The preliminary results suggest that moral adjectives don’t fall neatly under either category. In the second part we tackle the question of the scale of moral adjectives in a more theoretical fashion, i.e. by investigating their possible scales with mathematically precise tools.
Źródło:
Studia Semiotyczne; 2017, 31, 2; 161-178
0137-6608
Pojawia się w:
Studia Semiotyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polytropic Tachyon Scalar Field Model in 5-dimensional Universe
Autorzy:
Korunur, M.
Salti, M.
Aydogdu, O.
Powiązania:
https://bibliotekanauki.pl/articles/1076550.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Extra dimension
cosmology
dark energy
scalar field
Opis:
Recent astrophysical observations show that the universe has entered a late-time accelerated expansion period. It is commonly accepted that the dark energy is responsible for this enigmatic behavior of our universe, because it makes up about 70 percent of the content of our universe and dominates over the matter part. Therefore, the dark energy will govern the speedy enlargement and determine the fate of our universe. Another interpretation of the dark energy is that this is a new kind of dynamical field or fluid, something mysterious which fills all of space but something whose influence on the accelerated enlargement nature of our universe is the opposite of that of baryonic matter and ordinary energy. Here, we focus on the polytropic gas unified dark matter-energy model in a 5-dimensional cosmology to reconstruct tachyonic scalar field proposal of the dark energy. It is known that the background dynamics of the polytropic gas is equivalent to that one for the dark energy interacting with the dark matter. On the other hand, using scalar field is one of the most significant methods helping us to understand the dark universe. There are many scalar field proposals, but generally it is hard to get exact relations for the scalar field function and its self-interacting potential. In this work, making use of the 5-dimensional Polytropic gas model, we calculate exact relations for the tachyonic scalar field. After that, we discuss our theoretical calculations graphically in order to interpret our theoretical results in a different way.
Źródło:
World Scientific News; 2019, 115; 138-148
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of accuracy of simple methods for design and analysis of a blazed phase grating microstructure
Autorzy:
Wang, W.
Jing, X.
Zhao, J.
Li, Y.
Tian, Y.
Powiązania:
https://bibliotekanauki.pl/articles/173533.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
grating
effective medium theory
scalar diffraction theory
Opis:
In order to precisely analyze and design the transmittance characteristics of a blazed grating, the validity of both the scalar diffraction theory and the effective medium theory is quantitatively demonstrated. By making a comparison of diffraction efficiencies calculated by the two simplified methods and Fourier modal method, the accuracy can be obtained. It is found that when the normalized period is more than three wavelengths of the incident light, the scalar diffraction theory is useful to calculate the transmittance of the blazed grating within the error of less than 3%. The validity of the scalar diffraction theory increases when the normalized period increases. Importantly, by considering the Fresnel reflection effect, the validity of scalar diffraction theory can be significantly enhanced. Furthermore, when no higher-order diffraction waves appear and only zeroth order diffraction wave propagates, the effective medium theory is accurate to compute the diffraction efficiency within the difference of less than 1% between the zeroth order effective medium theory and Fourier modal method. The polarization characteristics of the validity of effective medium theory are also quantitatively demonstrated. The validity of the two simplified theories is dependent on not only the normalized period of surface microstructure but also the normalized groove depth.
Źródło:
Optica Applicata; 2017, 47, 2; 183-198
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of high speed induction motor drive operating in household appliances
Autorzy:
Binkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1193129.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
high speed drive
induction motor control
scalar control
Opis:
The paper presents conclusions which are results of research on the use of high-speed drives operating in household appliances. The solutions that use three-phase or two-phase induction motors were taken into consideration. The assumed power of motors was up to 1 kW. The article describes the control process of power converters that is characterized by unity power factor and output voltages with the fundamental frequency up to 667 Hz. The requirements for control process were characterized and intelligent solutions were analysed, taking into account power outages, fluctuations, or accidental failures of supply voltage. The control functions of elaborated controller, such as current and speed control, drive start-up and control circuit supply were described.
Źródło:
Power Electronics and Drives; 2016, 1, 36/1; 41-53
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Triviality of scalar linear type isotropy subgroup by passing to an alternative canonical form of a hypersurface
Autorzy:
Ežov, Vladimir
Powiązania:
https://bibliotekanauki.pl/articles/1294194.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
CR automorphisms
canonical form
scalar linear type isotropy
Opis:
The Chern-Moser (CM) normal form of a real hypersurface in $ℂ^N$ can be obtained by considering automorphisms whose derivative acts as the identity on the complex tangent space. However, the CM normal form is also invariant under a larger group (pseudo-unitary linear transformations) and it is this property that makes the CM normal form special. Without this additional restriction, various types of normal forms occur. One of them helps to give a simple proof of a (previously complicated) theorem about triviality of the scalar linear type isotropy subgroup of a nonquadratic hypersurface. An example of an analogous nontrivial subgroup for a 2-codimensional CR surface in $ℂ^4$ is constructed. We also consider the question whether the group structure that is induced on the family of normalisations to the CM normal form via the parametrisation of the isotropy automorphism group of the underlining hyperquadric coincides with the natural composition operation on the biholomorphisms.
Źródło:
Annales Polonici Mathematici; 1998, 70, 1; 85-97
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Orbital angular momentum due to modes interference
Autorzy:
Rondón Ojeda, Irving
Soto-Eguibar, Francisco
Powiązania:
https://bibliotekanauki.pl/articles/1835754.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
invariant beam
orbital angular momentum
mode interference
scalar potential
Opis:
We present generalized expressions to calculate the orbital angular momentum for invariant beams using scalars potentials. The solutions can be separated into transversal electric TE, transversal magnetic TM and transversal electromagnetic TE/TM polarization modes. We show that the superposition of non-paraxial vectorial beams with axial symmetry can provide a well-defined orbital angular momentum and that the modes superposition affects the angular momentum flux density. The results are illustrated and analyzed for Bessel beams.
Źródło:
Optica Applicata; 2021, 51, 1; 59-74
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stator windings condition diagnosis of voltage inverter-fed induction motor in open and closed-loop control structures
Autorzy:
Wolkiewicz, M.
Tarchała, G.
Kowalski, C. T.
Powiązania:
https://bibliotekanauki.pl/articles/141208.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
induction motor
shorted turns
scalar control
vector control DFOC
Opis:
This paper deals with detection of the stator windings shorted turns in an induction motor drive working under open (scalar) and closed loop (Direct Field Oriented DFO) control structures. In order to detect the early stage of stator winding fault, the analysis of symmetrical and principal components of stator voltages and currents is used. Experimental results obtained from a specially prepared induction motor are presented.
Źródło:
Archives of Electrical Engineering; 2015, 64, 1; 67-79
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New product differentiation rule for paired scalar reciprocal functions
Autorzy:
Czajko, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/1030632.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Scalar product differentiation rules
integral kernels
multispatial reality paradigm
paired dual reciprocal space
scalar product integration rules
single-space reality paradigm
singularity
Opis:
When integral kernel of an integral transform is being formed, it should be the outcome of scalar product differentiation rule if the kernel is supposed to be eventually used as an integrand in a prospective integration. Yet it has already been shown that despite ensuing from properly performed differentiation, the resulting integral kernel contains, beside the covariant differential that is suitable for integration, also a certain contravariant term, which is not appropriate for integration in the same space as the covariant differential. But the contravariant term also can be turned into proper, though multiplicatively inverse covariant differential, if placed within a space that is reciprocal to the given primary space in which the first, covariant differential, is represented naturally. This uncharacteristic conversion of the contravariant expression from the primary space into the reciprocal covariant differential in the dual reciprocal space that is paired with the given primary space, can be considered as indirect proof that pairing of mutually dual reciprocal spaces is necessary in order to properly form operationally legitimate and geometrically valid differential structures. Consequently, the pairing of an infinitesimal descending singularity of the 2D domain of complex numbers with an infinitely ascending singularity deployed in the 1D domain of real numbers requires certain dual reciprocal spatial or quasispatial structures, for the downward transition from 2D descending complex singularities to the 1D ascending “real” singularities to be meaningfully/unambiguously implemented. Furthermore, just as integration by parts formula is a counterpart of the regular product differentiation rule, a new multispatial scalar product integration rule is proposed as a counterpart to the singlespatial product differentiation rule, and introduced by analogy to the latter, “regular” product integration rule.
Źródło:
World Scientific News; 2020, 144; 358-371
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 36

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