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Wyświetlanie 1-15 z 33
Tytuł:
Invariance of reachability and observability for fractional positive linear electrical circuit with delays
Autorzy:
Yuan, Tong
Yang, Hongli
Powiązania:
https://bibliotekanauki.pl/articles/1841230.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
invariance
observability
positive linear electrical circuits with delays
reachability
Opis:
This paper focuses on the invariance of the reachability and observability for fractional order positive linear electrical circuits with delays and their checking methods. By derivation and comparison, it shows that conditions and checking methods of reachability and observability for integer and fractional order positive linear electrical circuits with delays are invariant. An illustrative example is presented at the end of the paper.
Źródło:
Archives of Electrical Engineering; 2021, 70, 3; 513-530
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Psychometric Properties of the Polish Version of the Short Grit Scale
Autorzy:
Wyszyńska, Patrycja
Ponikiewska, Klaudia
Karaś, Dominika
Najderska, Małgorzata
Rogoza, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/2128467.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
grit
consistency of interest
perseverance of effort
success
measurement invariance
Opis:
This study aimed to verify the psychometric properties of the Polish version of the Grit-S questionnaire. Grit is understood here as the perseverance and passion for long-term goals, and it encompasses two dimensions: Consistency of Interest and Perseverance of Effort. The sample comprised N = 270 participants aged 18–34 (Mage = 20.79). We performed confirmatory factor analyses to verify the dimensional structure of grit, multi-group confirmatory factor analysis to compare the structure across gender, and correlation analysis to examine external validity (exploring the correlations between grit, procrastination, and well-being). Findings showed satisfactory parameters for Grit-S including: reliability, structural and external validity, and measurement invariance across gender groups. The results support the possibility of using the Grit-S questionnaire in research exploring the predictors of success.
Źródło:
Polish Psychological Bulletin; 2017, 2; 229-236
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conformal Invariance and Conserved Quantities for Lagrange Equation of Thin Elastic Rod
Autorzy:
Wang, Peng
Feng, Hui-Rong
Lou, Zhi-Mei
Powiązania:
https://bibliotekanauki.pl/articles/1033429.pdf
Data publikacji:
2017-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
conformal invariance
Lie symmetry
conserved quantities
thin elastic rod
Lagrange equation
Opis:
Basing on the analytical mechanics methods, the Lagrangian equations of thin elastic rod is constructed. The definition of conformal invariance for the Lagrange mechanics of elastic rod is given. The criterions that conformal invariance of elastic rod is the Lie symmetry are obtained based on the Lie point transformation group. The structure equation and conserved quantity deduced from conformal invariance of elastic rod are constructed. Take twist rod as an example to illustrate the application of the results got in this paper.
Źródło:
Acta Physica Polonica A; 2017, 131, 2; 283-287
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is Time Inhomogeneous ?
Autorzy:
Sadatian, S. D.
Powiązania:
https://bibliotekanauki.pl/articles/412482.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
quantum gravity
Lorentz Invariance
symmetry breaking
varying speed of light
fractal mathematics
Opis:
In this article, we discuss probability of inhomogeneous time in high or low energy scale of physics. Consequently, the possibility was investigated of using theories such as varying speed of light (VSL) and fractal mathematics to build a framework within which answers can be found to some of standard cosmological problems and physics theories on the basis of time non-homogeneity.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 2; 155-159
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Appearance Schemas Inventory–Revised: Validation on a Polish Sample
Autorzy:
Poraj-Weder, Magdalena
Szulawski, Michał
Rogoza, Radosław
Jasielska, Dorota
Pios, Anna
Powiązania:
https://bibliotekanauki.pl/articles/31343478.pdf
Data publikacji:
2024
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
Appearance Schemas Inventory–Revised
appearance investment
body image
Polish adaptation
invariance analysis
Opis:
The aim of this study (N = 713) was to adapt the Appearance Schemas Inventory–Revised into Polish and evaluate its psychometric properties. The ASI-R is a widely used tool for measuring appearance schemas, but it is currently not available in Polish. The adaptation of the ASI-R has the potential to fill this gap and encourage research in the Polish community. The validation of the scale was conducted on two separate samples of healthy adults. Although the results indicate that the Polish version of the scale, in contrast to the original one, exhibits a one-factor structure, its psychometric properties are robust. The scale demonstrates high internal consistency and sound construct validity, established through correlations with various aspects of psychosocial functioning, along with body image and sociocultural attitudes toward appearance. The scale seems to be gender-invariant and can be utilized in future studies that adopt a cognitive-behavioral approach to appearance schemas.
Źródło:
Roczniki Psychologiczne; 2024, 27, 1; 27-48
1507-7888
Pojawia się w:
Roczniki Psychologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some applications of Noether’s theorem
Autorzy:
Montiel-Pérez, J. Yaljá
López-Bonilla, J.
López-Vázquez, R.
Vidal-Beltrán, S.
Powiązania:
https://bibliotekanauki.pl/articles/1166045.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Complex Riemann-Silberstein vector
Duality rotations
Ignorable variable
Invariance of the action
Lanczos variational method
Linear differential equation of second order
Maxwell equations
Noether’s theorem
Variation of parameters
Variational symmetry
Opis:
If the action S= ∫_(t_1)^(t_2)▒〖L(q,〗 (q,) ̇t) dt is invariant under the infinitesimal transformation t ̃=t+ε τ(q,t), q ̃_r= q_r+ε ξ_r (q,t),r=1,… ,n, with ε=constant ≪1, then the Noether’s theorem permits to construct the corresponding conserved quantity. The Lanczos approach employs to ε= q_(n+1) as a new degree of freedom, thus the Euler-Lagrange equation for this new variable gives the Noether’s constant of motion. Torres del Castillo and Rubalcava-García showed that each variational symmetry implies the existence of an ignorable coordinate; here we apply the Lanczos approach to the Noether’s theorem to motivate the principal relations of these authors. The Maxwell equations without sources are invariant under duality rotations, then we show that this invariance implies, via the Noether’s theorem, the continuity equation for the electromagnetic energy. Besides, we demonstrate that if we know one solution of p(x)y''+q(x)y'+r(x)y=0, then this Lanczos technique allows obtain the other solution of this homogeneous linear differential equation.
Źródło:
World Scientific News; 2018, 106; 69-80
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
F-tests for generalized linear hypotheses in subnormal models
Autorzy:
Mexia, Joao
Dias, Gerberto
Powiązania:
https://bibliotekanauki.pl/articles/729870.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
F-tests
subnormal models
mixed models
invariance
UMP tests
third type error
Opis:
When the measurement errors may be assumed to be normal and independent from what is measured a subnormal model may be used. We define a linear and generalized linear hypotheses for these models, and derive F-tests for them. These tests are shown to be UMP for linear hypotheses as well as strictly unbiased and strongly consistent for these hypotheses. It is also shown that the F-tests are invariant for regular transformations, possess structural stability and are almost strongly consistent for generalized linear hypothesis. An application to a mixed model studied by Michalskyi and Zmyślony is shown.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2001, 21, 1; 49-62
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperbolically convex functions
Autorzy:
Ma, Wancang
Minda, David
Powiązania:
https://bibliotekanauki.pl/articles/1311659.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
hyperbolic convexity
distortion theorem
growth thoerem
linear invariance
Opis:
We investigate univalent holomorphic functions f defined on the unit disk such that f() is a hyperbolically convex subset of ; there are a number of analogies with the classical theory of (euclidean) convex univalent functions. A subregion Ω of is called hyperbolically convex (relative to hyperbolic geometry on ) if for all points a,b in Ω the arc of the hyperbolic geodesic in connecting a and b (the arc of the circle joining a and b which is orthogonal to the unit circle) lies in Ω. We give several analytic characterizations of hyperbolically convex functions. These analytic results lead to a number of sharp consequences, including covering, growth and distortion theorems and the precise upper bound on |f''(0)| for normalized (f(0) = 0 and f'(0) > 0) hyperbolically convex functions. In addition, we find the radius of hyperbolic convexity for normalized univalent functions mapping into itself. Finally, we suggest an alternate definition of "hyperbolic linear invariance" for locally univalent functions f: → that parallels earlier definitions of euclidean and spherical linear invariance.
Źródło:
Annales Polonici Mathematici; 1994-1995, 60, 1; 81-100
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A viability result for nonconvex semilinear functional differential inclusions
Autorzy:
Lupulescu, Vasile
Necula, Mihai
Powiązania:
https://bibliotekanauki.pl/articles/729593.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
viability
invariance
tangency condition
semilinear differential inclusions
Opis:
We establish some sufficient conditions in order that a given locally closed subset of a separable Banach space be a viable domain for a semilinear functional differential inclusion, using a tangency condition involving a semigroup generated by a linear operator.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2005, 25, 1; 109-128
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lie symmetries of first order neutral differential equations
Autorzy:
Lobo, Jervin Zen
Valaulikar, Y.S.
Powiązania:
https://bibliotekanauki.pl/articles/122564.pdf
Data publikacji:
2019
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
determining equations
infinitesimals
invariance
neutral differential equations
splitting equations
symmetries
równanie różniczkowe pierwszego rzędu
warunek niezmienności
symetrie
równanie różniczkowe neutralne
Opis:
In this paper we extend the method of obtaining symmetries of ordinary differential equations to first order non-homogeneous neutral differential equations with variable coefficients. The existing method for delay differential equations uses a Lie-Bäcklund operator and an Invariant Manifold Theorem to define the operators which are used to obtain the infinitesimal generators of the Lie group. In this paper, we adopt a different approach and use Taylor’s theorem to obtain a Lie type invariance condition and the determining equations for a neutral differential equation. We then split this equation in a manner similar to that of ordinary differential equations to obtain an over-determined system of partial differential equations. These equations are then solved to obtain corresponding infinitesimals, and hence desired equivalent symmetries. We then obtain the symmetry algebra admitted by this neutral differential equation.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 1; 29-40
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variable structure observer design for a class of uncertain systems with a time-varying delay
Autorzy:
Liu W., J.
Powiązania:
https://bibliotekanauki.pl/articles/330119.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
obserwator
niezmienniczość
uogólniona odwrotność macierzy
variable structure observer
invariance property
generalized matrix inverse approach
Opis:
Design of a state observer is an important issue in control systems and signal processing. It is well known that it is difficult to obtain the desired properties of state feedback control if some or all of the system states cannot be directly measured. Moreover, the existence of a lumped perturbation and/or a time delay usually reduces the system performance or even produces an instability in the closed-loop system. Therefore, in this paper, a new Variable Structure Observer (VSO) is proposed for a class of uncertain systems subjected to a time varying delay and a lumped perturbation. Based on the strictly positive real concept, the stability of the equivalent error system is verified. Based on the generalized matrix inverse approach, the global reaching condition of the sliding mode of the error system is guaranteed. Also, the proposed variable structure observer will be shown to possess the invariance property in relation to the lumped perturbation, as the traditional variable structure controller does. Furthermore, two illustrative examples with a series of computer simulation studies are given to demonstrate the effectiveness of the proposed design method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 575-583
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk Attitudes, Buying and Selling Price for a Lottery and Simple Strategies
Autorzy:
Lewandowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/483243.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wealth-invariance
scale-invariance
CARA
CRRA
DARA
risk aversion
buying and selling price for a lottery
Opis:
This paper defines the concept of simple strategy and introduces three kinds of simple strategies: wealth-invariant, scale-invariant and "wealthier-accept more". For three commonly used utility function families: CARA, CRRA and DARA equivalent characterizations are obtained in terms of the corresponding simple strategy, in terms of the buying and selling price properties, and in terms of the utility function properties as expressed by Cauchy functional equations. Moreover, an extension of famous Pratt (1964) theorem is proved which involves buying price for a lottery as an alternative measure of comparative risk aversion. Additionally a number of propositions on both selling and buying price for a lottery and CRRA utility class are proved.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2013, 5, 1; 1-34
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Certainty-Equivalent Adaptive Control of a Nonlinear Aeroelastic System
Autorzy:
Lee, K. W.
Singh, S. N.
Powiązania:
https://bibliotekanauki.pl/articles/226734.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aeroelastic wing
adaptive flutter control
nonlinear system
immersion and invariance method
uncertain system
Opis:
The development of a non-certainty-equivalent adaptive control system for the control of a nonlinear aeroelastic system is the subject of this paper. The prototypical aeroelastic wing section considered here includes structural nonlinearity and a single control surface for the purpose of control. Its dynamical model has two-degree-of-freedom and describes the plunge and pitch motion. It is assumed that the model parameters (except the sign of one of the control input coefficients) are not known. The uncontrolled aeroelastic model exhibits limit cycle oscillation beyond a critical free-stream velocity. Based on the attractive manifold, and the immersion and invariance methodologies, a non-certainty-equivalent adaptive state variable feedback control law for the trajectory tracking of the pitch angle is derived. Using the Lyapunov analysis, asymptotic convergence of the state variables to the origin is established. It is shown that the trajectory of the system converges to a manifold. The special feature of the designed control system is that the closed-loop system asymptotically recovers the performance of a deterministic controller. This cannot happen if certainty-equivalent adaptive controllers are used. Simulation results are presented which show that the control system suppresses the oscillatory responses of the system in the presence of large parameter uncertainties.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 4; 463-471
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strzałka czasu a niektóre interpretacje mechaniki kwantowej
Time Arrow and Some Interpretations Of Quantum Mechanics
Autorzy:
Łagosz, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2013391.pdf
Data publikacji:
2006
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
strzałka czasu
EPR-eksperyment
równanie Schrödingera
(a)symetria czasowa
niezmienniczość względem odwrócenia czasu
pomiar kwantowy
parametry ukryte
time arrow
EPR-experiment
Schrödinger’s equation
time (a)symetry
time- reversal invariance
quantal measurements
“hidden variables”
Opis:
In the paper I discuss some premises of “quantum mechanics” with regard to the thesis that the time arrow does (not) exist. In this context I consider above all the famous Einstein-Podolsky-Rosen’s experiment (EPR-experiment). I also indicate Schrödinger’s interpretation of wave function “symmetrical” towards time (nomological isotropy) and the peculiar understanding of the pair particle-antiparticle, assuming that the direction of time can be reversed. Eventually, I discuss the issue of measurement in quantum mechanics with which the existence of time arrow (anisotropy) is often linked. If it comes to the interpretations of quantum mechanics, from the point of which I consider the issues in question, then in principle I limit myself to two: the so-called Copenhagen interpretation and David Bohm’s conception of “hidden parameters.” I arrive at a conclusion that the premises of quantum mechanics that are at issue here cannot be sufficient grounds for a conclusive recognition of the reversibility (non-existence) of time arrow.
Źródło:
Roczniki Filozoficzne; 2006, 54, 2; 391-411
0035-7685
Pojawia się w:
Roczniki Filozoficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transformations within (Existentialist) Invariance in Ariel by Marina Carr with Reference to John Millington Synge’s Riders to the Sea
Transformacje w (egzystencjalnej) niezmienności: analiza porównawcza Ariel Mariny Carr i Riders to the Sea Johna Millingtona Synge’a
Autorzy:
Koneczniak, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/37555754.pdf
Data publikacji:
2024
Wydawca:
Akademia Ignatianum w Krakowie
Tematy:
Carr, Marina
Ariel
Synge, John Millington
Riders to the Sea
analiza porównawcza
niezmienność
Carr
Marina; Synge
John Millington
comparison
invariance
existentialism
Opis:
This article is a comparative analysis of Marina Carr’s Ariel (2002) and John Millington Synge’s Riders to the Sea. The main research context comes from common critical treatments of Carr’s oeuvre within the scope of Synge’s influences. The plays discussed in this essay have not been subject to comparative studies before (to the best of the author’s knowledge). The main argument consists in examining the loci of invariance and their transformations with reference to themes, characters’ roles, and their relationships, which will be compared in terms of notions of necessity, generational suffering, reliance on the worldly, and death in the unknown realm, partly treated within existentialism.
Celem artykułu jest dokonanie analizy sztuki Ariel Mariny Carr i Riders to the Sea Johna Millingtona Synge’a. Twórczość Carr często traktowana jest jako kontynuacja dramaturgii Synge’a i utwory tej irlandzkiej dramatopisarki są analizowane w odniesieniu do dramatów Synge’a. Porównanie Ariel i Riders to the Sea wydaje się jednak tematem, który wciąż warto podejmować i wykazywać aspekty niezmienności i ich transformacji. Omówione porównania dotyczą takich motywów, jak: konieczność, pokoleniowe cierpienie, poleganie na doczesności oraz śmierć w nieznanej przestrzeni. Zostaną one częściowo potraktowane w swoim ogólnym odniesieniu do egzystencjalizmu.
Źródło:
Perspektywy Kultury; 2024, 45, 2; 213-230
2081-1446
2719-8014
Pojawia się w:
Perspektywy Kultury
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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