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Tytuł:
Scope ambiguities, monads and strengths
Autorzy:
Grudzińska, J.
Zawadowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/103935.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Podstaw Informatyki PAN
Tematy:
scope ambiguity
continuation monad
strength
Opis:
In this paper, we will discuss three semantically distinct scope assignment strategies: traditional movement strategy, polyadic approach, and continuation-based approach. Since generalized quantifiers on a set X are elements of C(X), which is the value of the continuation monad C on X, quantifier phrases are interpreted as C-computations, in all three approaches. The main goal of this paper is to relate the three strategies to the computational machinery connected to the monad C (strength and derived operations). As will be shown, both the polyadic approach and the continuation-based approach make heavy use of monad constructs. In the traditional movement strategy, monad constructs are not used but we still need them to explain how the three strategies are related and what can be expected of them with regard to handling scopal ambiguities in simple sentences.
Źródło:
Journal of Language Modelling; 2017, 5, 2; 179-227
2299-856X
2299-8470
Pojawia się w:
Journal of Language Modelling
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Continuation of holomorphic solutions to convolution equations in complex domains
Autorzy:
Ishimura, Ryuichi
Okada, Jun-ichi
Okada, Yasunori
Powiązania:
https://bibliotekanauki.pl/articles/1207967.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
convolution equation
analytic continuation
characteristic set
Opis:
For an analytic functional $S$ on $ℂ^n$, we study the homogeneous convolution equation S * f = 0 with the holomorphic function f defined on an open set in $ℂ^n$. We determine the directions in which every solution can be continued analytically, by using the characteristic set.
Źródło:
Annales Polonici Mathematici; 2000, 74, 1; 105-115
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of the flight dynamics helicopter carrying an external load using bifurcation theory and continuation methods
Studium dynamiki lotu śmigłowca z podwieszonym ładunkiem z wykorzystaniem teorii bifurkacji i metod kontynuacyjnych
Autorzy:
Sibilski, K.
Powiązania:
https://bibliotekanauki.pl/articles/280714.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
non-linear helicopter dynamics
bifurcation theory
continuation method
Opis:
The paper presents a study of the flight dynamics of a helicopter with an articulated rotor, carrying a suspended load. The aircraft model includes rigid body dynamics, individual flap and blade dynamics, and inflow dynamics. The load is a point mass with a single suspension point. Results are obtained for load masses of up to 1500 kg, with load-to-helocopter mass rations up to 33%, and cable lengths up to 55m. The presence of the external load modifies the flight dynamics and handling quality characteristics of the helicopter because the dynamic and aerodynamic characteristics of the load may make it unstable in certain fight conditions. Maneuvers of this system in wide flight regimes involves non-linear aerodynamics and inertial coupling. In can be stated that the helicopter with the suspended load is a inherently non-linear and time varying system. Theory of dynamical systems provides a methodology for studying such non-linear systems. Bifurcation theory is a part of that theory. It considers changes in the stability of the system which lead to qualitatively different responses of it. In this paper, results from the theory of dynamical systems are used to predict the nature of instabilities caused by bifurcations and the response of the rotorcraft with the suspended load that follow such bifurcations.
W pracy przedstawiono studium dynamiki lotu śmigłowca z przgubowym wirnikiem nośnym, przenoszącego podwieszony pod kadłubem ładunek. W zastosowanym modelu wiropłata uwzględniono stopnie swobody nieodkształcalnego kadłuba, dynamikę wahań i odchyleń łopat wirnika nośnego oraz dynamikę przepływu przez płaszczyznę wirnika nośnego. Założono, że podwieszony ładunek jest punktem materialnym, na który działają siły aerodynamiczne, podwieszonym w jednym punkcie pod kadłubem śmigłowca. Wyniki obliczeń uzyskano dla podwieszonych ładunków o masie do 1500kg (stosunek masy ładunku do masy śmigłowca do 35%), podwieszonych na linie o długości do 55m. Obecność podwieszonego ładunku modyfikuje charakterystyki dynamiczne i osiągi śmigłowca ze względu na silne sprzężenia aerodynamiczne i bezwładnościowe pomiędzy jego ruchem a ruchami śmigłowca. Ze względu na fakt, że układ śmigłowiec-podwieszony ładunek jest opisany za pomocą silnienieliniowych zwyczajnych równań różniczkowych, zastosowanie klasycznej analizy modalnej układu nie zawsze jest możliwe. Doskonałych narzędzi do badania takich równań dostarcza teoria układów dynamicznych i będąca jej częścią teoria bifurkacji. W pracy wykorzystano metodologię teorii układów dynamicznych do prognozowania natury niestabilności spowodowanej występującymi bifurkacjami. Ponadto przeprowadzono symulacje ruchu układu śmigłowiec-podwieszony ładunek po wystąpieniu bifurkacji.
Źródło:
Journal of Theoretical and Applied Mechanics; 2003, 41, 4; 823-852
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytic continuation of solutions of some nonlinear convolution partial differential equations
Autorzy:
Tahara, H.
Powiązania:
https://bibliotekanauki.pl/articles/952828.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
convolution equations
partial differential equations
analytic continuation
summability
sector
Opis:
The paper considers a problem of analytic continuation of solutions of some nonlinear convolution partial differential equations which naturally appear in the summa-bility theory of formal solutions of nonlinear partial differential equations. Under a suitable assumption it is proved that any local holomorphic solution has an analytic extension to a certain sector and its extension has exponential growth when the variable goes to infinity in the sector.
Źródło:
Opuscula Mathematica; 2015, 35, 5; 739-773
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Lowner-Kufarev representations for domains with analytic boundaries
Autorzy:
Prokhorov, Dmitri
Powiązania:
https://bibliotekanauki.pl/articles/747254.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Lowner-Kufarev equation
analytic continuation
univalent polynomials
bounded univalent functions
Opis:
We consider the Lowner-Kufarev differential equations generating univalent maps of the unit disk onto domains bounded by analytic Jordan curves. A solution to the problem of the maximal lifetime shows how long a representation of such functions admits using infinitesimal generators analytically extendable outside the unit disk. We construct a Lowner-Kufarev chain consisting of univalent quadratic polynomials and compare the Lowner-Kufarev representations of bounded and arbitrary univalent functions.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2011, 65, 2
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A screw dislocation located outside, inside or on the interface of a parabolic elastic inhomogeneity
Autorzy:
Wang, X.
Schiavone, P.
Powiązania:
https://bibliotekanauki.pl/articles/38627364.pdf
Data publikacji:
2021
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
screw dislocation
parabolic elastic inhomogeneity
superposition
conformal mapping
analytic continuation
Opis:
Using conformal mapping techniques, superposition and analytic continuation, we derive analytic solutions to the problem of a screw dislocation interacting with a parabolic elastic inhomogeneity. The screw dislocation can be located anywhere either in the surrounding matrix or in the parabolic inhomogeneity or simply on the parabolic interface itself. We obtain explicit expressions for the two analytic functions in the image plane characterizing the elastic fields describing displacement and stresses in the two-phase composite. Using the Peach-Koehler formula, we also obtain the image force acting on the screw dislocation. The analytic function defined in the parabolic inhomogeneity in the physical plane can be interpreted in terms of real and image screw dislocations for any location of the real screw dislocation.
Źródło:
Archives of Mechanics; 2021, 73, 3; 219-235
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Motion planning for nonholonomic systems with earlier destination reaching
Autorzy:
Ratajczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/230046.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
motion planning
nonholonomic
endogenous configuration space
homotopy
continuation
earlier destination reaching
Opis:
The motion planning problem consists in finding a control function which drives the system to a desired point. The motion planning algorithm derived with an endogenous configuration space approach assumes that the motion takes place in an arbitrary chosen time horizon. This work introduces a modification to the motion planning algorithm which allows to reach the destination point in time, which is shorter than the assumed time horizon. The algorithm derivation relies on the endogenous configuration space approach and the continuation (homotopy) method. To achieve the earlier destination reaching a new formulation of the task map and the task Jacobian are introduced. The efficiency of the new algorithm is depicted with simulation results.
Źródło:
Archives of Control Sciences; 2018, 28, 2; 269-283
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of aircraft lost of control in the flight by continuation, bifurcation, and catastrophe theory methods
Autorzy:
Sibilski, K.
Kowalski, M.
Powiązania:
https://bibliotekanauki.pl/articles/246470.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
nonlinear dynamics of flight
lost of control in the flight
catastrophe theory
bifurcation
continuation method
Opis:
Lost of Control in Flight (LOC-I) is ordinarily associated with flight outside of the normal flight envelope, with nonlinear behaviours, and with an inability of the pilot to control the aircraft. These results provide a means for analysing accident data to establish whether or not the accident should be classified as LOC-I. Moreover, they help identify when the initial upset occurred, and when control was lost. The analysis also suggests which variables were involved, thereby providing clues as to the underlying mechanism of upset. However, it does not provide direct links to the flight mechanics of the aircraft, so it cannot be used proactively to identify weaknesses or limitations in the aircraft or its control systems. Moreover, it does not explain how departures from controlled flight occur. The complexity of the disaster aetiology stems from both the scale and coupling of the systems (not only the physical aircraft systems but also the organizational systems that support the operation). This complexity creates a pattern of disaster that evolves or it is precipitated through a series of several small failures. The cusp catastrophe model facilitates the mapping of Reason’s latent failure model, providing a descriptive and predictive illustration of the emergence of latent conditions under the trigger of situational factors. The risk of an accident increases as the situational and systematic factors combine to create an inherent instability resulting in the catastrophic event.
Źródło:
Journal of KONES; 2016, 23, 4; 451-460
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boundary value problems with solutions
Autorzy:
Herzog, Gerd
Kunstmann, Peer Chr.
Powiązania:
https://bibliotekanauki.pl/articles/256054.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Dirichlet boundary value problems solutions in convex sets
continuation method
ordered Banach spaces
concave solutions
Opis:
By means of the continuation method for contractions we prove the existence of solutions of Dirichlet boundary value problems in convex sets. As an application we prove the existence of concave solutions of certain boundary value problems in ordered Banach spaces.
Źródło:
Opuscula Mathematica; 2019, 39, 1; 49-60
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the summability of divergent power series solutions for certain first-order linear PDES
Autorzy:
Hibino, M.
Powiązania:
https://bibliotekanauki.pl/articles/255352.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
partial differential equation
divergent power series
summability
asymptotic expansion
analytic continuation
integro-differential equation
integral equation
Opis:
This article is concerned with the study of the Borel summability of divergent power series solutions for certain singular first-order linear partial differential equations of nilpotent type. Our main purpose is to obtain conditions which coefficients of equations should satisfy in order to ensure the Borel summability of divergent solutions. We will see that there is a close affinity between the Borel summability of divergent solutions and global analytic continuation properties for coefficients of equations.
Źródło:
Opuscula Mathematica; 2015, 35, 5; 595-624
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy integral of the Stokes flow in a singularly perturbed exterior domain
Autorzy:
Riva, M. D.
Powiązania:
https://bibliotekanauki.pl/articles/255971.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
boundary value problem for Stokes system
singularly perturbed exterior domain
real analytic continuation in Banach space
Opis:
We consider a pair of domains Ωb and Ωs in Rn and we assume that the closure of Ωb does not intersect the closure of ε Ωs for ε ∈ (0, ε 0). Then for a fixed ε ∈ (0, ε0)we consider a boundary value problem in Rn\ (Ωb ∪ εΩs) which describes the steady state Stokes flow of an incompressible viscous fluid past a body occupying the domain Ωb and past a small impurity occupying the ε Ωs. The unknown of the problem are the velocity field u and the pressure field p, and we impose the value of the velocity field u on the boundary both of the body and of the impurity. We assume that the boundary velocity on the impurity displays an arbitrarily strong singularity when ε tends to 0. The goal is to understand the behaviour of the strain energy of (u, p) for ε small and positive. The methods developed aim at representing the limiting behaviour in terms of analytic maps and possibly singular but completely known functions of ε, such as ε-1, log &epsilon.
Źródło:
Opuscula Mathematica; 2012, 32, 4; 647-659
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Homotopy Approach to Rational Covariance Extension With Degree Constraint
Autorzy:
Enqvist, P.
Powiązania:
https://bibliotekanauki.pl/articles/908061.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
optymalizacja
teoria systemów
stochastic realization theory
rational covariance extension problem
ARMA model design
continuation method
optimization
Opis:
The solutions to the Rational Covariance Extension Problem (RCEP) are parameterized by the spectral zeros. The rational filter with a specified numerator solving the RCEP can be determined from a known convex optimization problem. However, this optimization problem may become ill-conditioned for some parameter values. A modification of the optimization problem to avoid the ill-conditioning is proposed and the modified problem is solved efficiently by a continuation method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2001, 11, 5; 1173-1201
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE NOMAD’S STAR OF BAIR DUGAROV AS THE GUIDING LIGHT OF POST-SOVIET BURYATIA
Autorzy:
Dondukova, Galina
GRABER, KATHRYN E.
MIKHALEV, ALEXEY
Powiązania:
https://bibliotekanauki.pl/chapters/960371.pdf
Data publikacji:
2020-12-30
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
ethnic identity
revival of historical memory
nomad
lineage continuation
ancestor’s cult
Buryat poetry
post-Soviet Buryatia
Opis:
The Nomad’s Star is undoubtedly the most prominent poem of Bair Dugarov. Having appeared in the critical time of post-Soviet searching of selfidentification among the Buryats, the poem instantly gained popularity. In this article, I argue that the poem The Nomad’s Star becomes the guiding light for the modern generation of Buryats after the collapse of the Soviet Union. Dugarov calls upon his contemporaries not to forget the nomadic principles of the ancestors. He employs such motifs and artistic images which reproclaim the ideas of lineage continuation, the ancestors’ cult, and harmony in the family – values that are relevant and vital at all times. I close read the poem The Nomad’s Star and outline main cultural concepts depicted in it, such as “route,” “hearth,” “lineage,” and others, which promote the revival of ethnic consciousness in the memory of the Buryats. I support my argumentation with the words of the poet himself and literary critics’ opinions. The public discourse and social network materials devoted to The Nomad’s Star are also called upon, evidencing the poem’s role and significance in contemporary Buryatia.
Źródło:
Facing Challenges of Identification: Investigating Identities of Buryats and Their Neighbor Peoples; 279-300
9788323547334
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topic familiarity and story continuation in young English as a foreign language learners’ writing tasks
Autorzy:
Bui, Gavin
Luo, Xueya
Powiązania:
https://bibliotekanauki.pl/articles/1902589.pdf
Data publikacji:
2021-09-13
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
topic familiarity
reading input
L2 writing
story continuation
writing quality
text length
lexical diversity
lexical sophistication
Opis:
Prior research demonstrates that primary and secondary school teachers often find teaching young learners to write in a second language a slow and effortful process. Moreover, students in this age range lack the motivation to write. Therefore, it is important to explore the EFL writing pedagogy suitable for young learners. The present study investigated how story continuation (with or without reading input) under different topic familiarity conditions serves as a viable pedagogical means for secondary school students. Ninety-one Chinese students in four intact classes of comparable proficiency levels were assigned four writing task conditions in a 2 ⨉ 2 factorial design. Group 1 (Fam) was provided with the beginning of a familiar story in L1 Chinese and was required to complete the story in L2 English. Group 2 (UnFam) had the same task as Group 1, with an unfamiliar story. Group 3 (Fam+Input) was initially provided with the complete familiar story in Chinese (the same story as Group 1) as reading input and were then instructed to write the story in English with the reading material taken away. Group 4 (Unfam+Input) received the full unfamiliar story in Chinese (the same story as Group 2) as input before writing. Again they were not allowed to refer to the reading in the composing process. The results revealed that the young learners who wrote on familiar topics (Groups 1 and 3) produced longer texts and demonstrated greater lexical diversity than those with unfamiliar stories (Groups 2 and 4), although topic familiarity did not affect their writing quality or lexical sophistication. As for the story continuation conditions, students who completed writing the story without the L1 reading input on the topics (Groups 1 and 2) developed longer compositions and better writing quality than those with such input (Groups 3 and 4), although their lexical profiles (both lexical diversity and lexical sophistication) remained uninfluenced. Pedagogical implications for EFL writing among young learners were also discussed in the present study.
Źródło:
Studies in Second Language Learning and Teaching; 2021, 11, 3; 377-400
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of shape memory alloy in harvesto-absorber system
Autorzy:
Kęcik, K.
Powiązania:
https://bibliotekanauki.pl/articles/386907.pdf
Data publikacji:
2015
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
pendulum
sma spring
energy harvester
vibration absorber
control
continuation method
stopy z pamięcią kształtu
teoria Ginzburga-Landaua
tłumik drgań
Opis:
This paper presents a conception of the harvester-absorber system consisting of two parts. The first is the pendulum attached to the main system (oscillator), which is suspended on the linear damper and the nonlinear spring made of shape memory alloy. The spring is modelled as a polynomial function based on Landau–Ginzburg theory of phase transitions (similar as ferroelectric and ferromagnets). The obtained results show, that SMA element can increase harvesting energy level, while the absorber effect can be impaired (but not loss). Additionally, introducing SMA element causes changes in dynamics, introduces a new unstable solutions and bifurcations. The analysis was done by classical integration and continuation solution methods.
Źródło:
Acta Mechanica et Automatica; 2015, 9, 3; 155-160
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
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