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    Wyświetlanie 1-35 z 35
    Tytuł:
    Lower extremity muscle strength, postural stability and functional movement screen in female basketball players after ACL reconstruction : Preliminary report
    Autorzy:
    Wrzesień, Zuzanna
    Truszczynska-Baszak, Aleksandra
    Rzepka, Remigiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/307162.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    koszykówka
    ACL
    siła mięśni
    basketball players
    ACL reconstruction
    functional stability
    muscle strength
    Opis:
    The anterior cruciate ligament (ACL) tear is a common injury in basketball. Its consequence is a long absence from training, resulting from surgical treatment and long physiotherapy. The aim of the study was to assess muscle strength, postural stability and functional movements in female basketball players, who returned to professional sport careers after anterior cruciate ligament reconstruction. Methods: The study population consisted of 10 female basketball players after surgical reconstruction of anterior cruciate ligament. The control group consisted of 10 players without ACL injury. We used the Biodex System 4 Pro dynamometer to assess the muscle strength of the knee. We used it to conduct the test of flexors and extensors of the knee in isokinetic conditions. We also used Keiser Power Squat A300 in the single leg squat to measure power and the Biodex Balance SD dynamographic platform to assess balance in single leg stance. Results: We found deficits in both movement patterns and in muscle strength in the study population, compared to control group. Conclusions: The basketball players after ACL reconstruction had significant differences between the operated and non-operated limb. The differences may predispose them towards repeated ACL injuries.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 2; 71-81
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ensuring of functional stability of difficult dynamic systems as one of urgent scientific tasks of modern theory of automatic control
    Zapewnienie funkcjonalnej stabilności złożonych układów dynamicznych jako jeden z aktualnych problemów naukowych nowoczesnej teorii sterowania
    Autorzy:
    Mashkov, O.
    Kosenko, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/408887.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    survivability
    criteria
    control
    technical system
    functional stability
    przeżywalność
    kryteria
    sterowanie
    system techniczny
    stabilność funkcjonalna
    Opis:
    In the article the functional stability of complex systems are considered. Mathematical formalization of property of functional stability is presented. Promising directions of research in this area are also described.
    W artykule przedstawiono rozważania dotyczące funkcjonalnie stabilnych systemów złożonych. Przedstawiono matematyczną formalizację funkcjonalnej stabilności obiektu. Opisano również najbardziej obiecujące obszary badań w tej dziedzinie.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2015, 3; 39-42
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The functional stability of on-board information-controlling complexes of maneuverable vehicles
    Funkcjonalna stabilność pokładowych systemów informacyjno-sterujących manewrowalnych środków transportu
    Autorzy:
    Baranov, G.
    Kosenko, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/408078.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    transportation
    traffic safety
    functional stability
    automation technology
    reducing the risk
    transport
    bezpieczeństwo ruchu
    stabilność funkcjonalna
    automatyzacja
    redukcja ryzyka
    Opis:
    In the article, methods of improving functional stability on-board information and control systems available for vehicles are considered. Models, methods and tools for automating the management process of ergatic (Man-Machine Systems) innovative systems of transport are proposed. At a time of increased risk of critical (crisis) situations caused by the actions of environmental factors and threatening accidents and disasters, they ensure the safety of functional stability in a single space-time continuum.
    W artykule opisano metody poprawy stabilności funkcjonalnej pokładowych systemów informacyjno-sterujących manewrowalnych środków transportu. Zaproponowano modele, metody i narzędzia do automatyzacji procesu zarządzania innowacyjnymi ergatycznymi (Man-Machine Systems) systemami transportu. W czasie, gdy wzrasta ryzyko wystąpienia sytuacji krytycznych (kryzysowych) spowodowanych przez działania czynników środowiskowych i zagrożenie katastrofa, zapewniają bezpieczeństwo stabilności funkcjonalnej w pojedynczej czasoprzestrzeni.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2015, 3; 35-38
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of functional shortening of hamstring muscles and rectus femoris muscle on proprioception of knee joint in patients after ACL rupture
    Wpływ funkcjonalnego skrócenia mięśni kulszowo-goleniowych i prostego uda na kinestezję stawu kolanowego u pacjentów z zerwaniem ACL
    Autorzy:
    Szlęzak, Michał
    Likus, Wirginia
    Matuszny, Bartłomiej
    Krupa, Maciej
    Ficek, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1035678.pdf
    Data publikacji:
    2018
    Wydawca:
    Śląski Uniwersytet Medyczny w Katowicach
    Tematy:
    proprioception
    functional stability
    sensorimotor system
    passive stiffness
    neuromuscular control
    propriocepcja
    system sensomotoryczny
    sztywność pasywna
    kontrola nerwowo-mięśniowa
    czynnościowa stabilność
    Opis:
    INTRODUCTION: The aim of this study is to demonstrate the relationship between functional shortening of the rectus femoris muscle, hamstring muscle and knee proprioception in patients after anterior cruciate ligament [ACL] rupture. MATERIAL AND METHODS: A group of 35 men with ACL rupture (without ACL reconstruction), aged 18 to 43 years (28 ± 7.4 years) was enrolled in the study. Firstly, the functional shortening of above mentioned muscles was evaluated in both healthy and injured lower limbs. Knee joint proprioception was assessed using a BTE Primus RS by examining the angular deviation from the center of the kinetic range in the knee joint with and without visual inspection. RESULTS: A statistically significant positive correlation was found between the functional shortening of the hamstrings and the proprioception of the flexion motion assessed under conditions without visual inspection. In addition, a statistically significant negative correlation was found between the functional shortening of the rectus femoris muscle of the injured lower limb and proprioception of the knee flexion movement assessed under conditions without visual inspection. CONCLUSIONS: A deficit of knee proprioception correlates with the functional shortening of the thigh muscles. Pa-tients with functional shortening of the rectus femoris have better knee proprioception. Patients with functional shortening of hamstrings have worse knee proprioception.
    WSTĘP: Celem badania jest wykazanie związku między skróceniem czynnościowym mięśnia prostego uda i mięśni kulszowo-goleniowych a kinestezją stawu kolanowego u pacjentów po zerwaniu więzadła krzyżowego przedniego [ACL]. MATERIAŁ I METODY: Badaniem objęto grupę 35 mężczyzn z zerwaniem ACL (bez rekonstrukcji) w wieku od 18 do 43 lat (28 ± 7,4 roku). Funkcjonalne skrócenie wyżej wymienionych mięśni oceniano zarówno na zdrowej, jak i kontuzjowanej nodze. Kinestezję stawu kolanowego oceniano za pomocą aparatu BTE Primus RS, badając odchylenie kątowe od środka zakresu ruchu w stawie kolanowym z i bez kontroli wzroku. WYNIKI: Stwierdzono statystycznie istotną dodatnią korelację między funkcjonalnym skróceniem mięśni kulszowo- -goleniowych a kinestezją dla ruchu zgięcia ocenianego w warunkach bez kontroli wzroku. Ponadto stwierdzono istotną statystycznie ujemną korelację między funkcjonalnym skróceniem mięśnia prostego uda nogi uszkodzonej a kinestezją ruchu zgięcia kolana ocenianego w warunkach bez kontroli wzroku. WNIOSKI: Deficyt propriocepcji kolana koreluje z funkcjonalnym skróceniem mięśni uda. Pacjenci z funkcjonalnym skróceniem mięśnia prostego uda mają lepszą kinestezję stawu kolanowego, natomiast u pacjentów z funkcjonalnym skróceniem ścięgien podkolanowych stwierdzono gorszą kinestezję stawu kolanowego.
    Źródło:
    Annales Academiae Medicae Silesiensis; 2018, 72; 95-100
    1734-025X
    Pojawia się w:
    Annales Academiae Medicae Silesiensis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A theorem of the Hahn-Banach type and its applications
    Autorzy:
    Gajda, Zbigniew
    Smajdor, Andrzej
    Smajdor, Wilhelmina
    Powiązania:
    https://bibliotekanauki.pl/articles/1311972.pdf
    Data publikacji:
    1992
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    Hahn-Banach theorem
    additive selection
    subadditive set-valued function
    binary intersection property
    stability of functional equations
    Opis:
    Let Y be a subgroup of an abelian group X and let T be a given collection of subsets of a linear space E over the rationals. Moreover, suppose that F is a subadditive set-valued function defined on X with values in T. We establish some conditions under which every additive selection of the restriction of F to Y can be extended to an additive selection of F. We also present some applications of results of this type to the stability of functional equations.
    Źródło:
    Annales Polonici Mathematici; 1992, 57, 3; 243-252
    0066-2216
    Pojawia się w:
    Annales Polonici Mathematici
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remarks on the stability of some quadratic functional equations
    Autorzy:
    Kominek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/255399.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    quadratic functional equations
    stability
    Opis:
    Stability problems concerning the functional equations of the form f(2x + y) = 4ƒ(x) + ƒ(y) + ƒ(x + y) - ƒ(x - y), and ƒ(2x + y) + ƒ(2x -y) = 8ƒ(x) + 2ƒ(y) are investigated. We prove that if the norm of the difference between the LHS and the RHS of one of equations (1) or (2), calculated for a function g is say, dominated by a function φ in two variables having some standard properties then there exists a unique solution ƒ of this equation and the norm of the difference between g and ƒ is controlled by a function depending on φ.
    Źródło:
    Opuscula Mathematica; 2008, 28, 4; 517-527
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the superstability of generalized d’Alembert harmonic functions
    Autorzy:
    EL-Fassi, Iz-iddine
    Powiązania:
    https://bibliotekanauki.pl/articles/744671.pdf
    Data publikacji:
    2016-12-01
    Wydawca:
    Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
    Tematy:
    stability
    d’Alembert functional equation
    Opis:
    The aim of this paper is to study the superstability problem of the d’Alembert type functional equation f(x+y+z)+f(x+y+σ(z))+f(x+σ(y)+z)+f(σ(x)+y+z)=4f(x)f(y)f(z) $$f(x + y + z) + f(x + y + \sigma (z)) + f(x + \sigma (y) + z) + f(\sigma (x) + y + z) = 4f(x)f(y)f(z)$$ for all x, y, z ∈ G, where G is an abelian group and σ : G → G is an endomorphism such that σ(σ(x)) = x for an unknown function f from G into ℂ or into a commutative semisimple Banach algebra.
    Źródło:
    Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica; 2016, 15
    2300-133X
    Pojawia się w:
    Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exponential stability results for variable delay difference equations
    Autorzy:
    Yankson, Ernest
    Powiązania:
    https://bibliotekanauki.pl/articles/1397336.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    exponential stability
    Lyapunov functional
    instability.
    Opis:
    Sufficient conditions that guarantee exponential decay to zero of the variable delay difference equation $x(n + 1) = a(n)x(n) + b(n)x(n − g(n))$ are obtained. These sufficient conditions are deduced via inequalities by employing Lyapunov functionals. In addition, a criterion for the instability of the zero solution is established. The results in the paper generalizes some results in the literature.
    Źródło:
    Opuscula Mathematica; 2021, 41, 1; 145-155
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical methods for hyperbolic differential functional problems
    Autorzy:
    Ciarski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/255099.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    functional differential equations
    stability and convergence
    Opis:
    The paper deals with the initial boundary value problem for quasilinear first order partial differential functional systems. A general class of difference methods for the problem is constructed. Theorems on the error estimate of approximate solutions for difference functional systems are presented. The convergence results are proved by means of consistency and stability arguments. A numerical example is given.
    Źródło:
    Opuscula Mathematica; 2008, 28, 1; 29-46
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Core Stability and Functional Exercises on Selected Speed and Strength Parameters in Expert Female Footballers
    Autorzy:
    Niewolna, Natalia
    Zwierko, Teresa
    Powiązania:
    https://bibliotekanauki.pl/articles/1054673.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    core stability
    football
    functional training
    motor effects
    Opis:
    Designed to strengthen the deep (stabilizer) muscles which stabilize joints and ligaments, core stability exercises are important for the development of motor skills in athletes. In this research, we aimed to determine how a two-year program of core stability and functional exercises influenced the strength and speed of female football players. The tested athletes (n = 17) were members of Olimpia Szczecin MKS, a first division football club from Poland. Their mean age was 19.8 ±1.4 years, while the mean duration of sport experience was 6 years. We analyzed their running speed, as well as the maximal strength of eight major muscle groups: rectus abdominals, abdominal oblique, shoulder girdle, chest, upper limbs, quadriceps, biceps and gastronomies. The effects of training on motor speed and strength were measured twice, prior to each of the two seasons. The functional training resulted in significant changes in the strength of various muscle groups: quadriceps (Δ17.1 kg; p < 0.05), abdominal oblique muscle (Δ9.1 kg; p < 0.05), shoulder girdle (Δ3.6 kg; p < 0.05) and chest (Δ3.5 kg; p < 0.05). There was also a significant reduction in the time of the 30 meter sprint (p < 0.05) (Δ0.1 s; p < 0.05). In summary, functional training had a positive effect on the strength and running speed of the tested female footballers.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2015, 12, 4; 91-97
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Global rational stabilization of a class of nonlinear time-delay systems
    Autorzy:
    Echi, Nadhem
    Ghanmi, Boulbaba
    Powiązania:
    https://bibliotekanauki.pl/articles/229187.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rational stability
    delay system
    nonlinear observer
    Lyapunov functional
    Opis:
    The present paper is mainly aimed at introducing a novel notion of stability of nonlinear time-delay systems called Rational Stability. According to the Lyapunov-type, various sufficient conditions for rational stability are reached. Under delay dependent conditions, we suggest a nonlinear time-delay observer to estimate the system states, a state feedback controller and the observer-based controller rational stability is provided. Moreover, global rational stability using output feedback is given. Finally, the study presents simulation findings to show the feasibility of the suggested strategy.
    Źródło:
    Archives of Control Sciences; 2019, 29, 2; 259-278
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Theoretical Study of Polyethylene Glycol Polynitrates as Potential Highly Energetic Plasticizers for Propellants
    Autorzy:
    Wang, Guixiang
    Xu, Yimin
    Zhang, Wenjing
    Gong, Xuedong
    Powiązania:
    https://bibliotekanauki.pl/articles/358877.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    polyethylene glycol polynitrates
    density functional theory
    density
    specific impulse
    stability
    Opis:
    Polyethylene glycol polynitrates may be used as plasticizers in propellants. In this study, ten derivatives of ethylene glycol dinitrate were investigated using the density functional theory method. The fitted densities (ρ’exp.) were obtained and were very close to the experimental values. The detonation properties were predicted using the modified Kamlet-Jacobs equations and the specific impulse (Is) was evaluated according to the largest exothermic principle. A new indicator, K = Is · ρ’exp., is proposed to evaluate the energetic characteristics of the plasticizers. Thermal stability is discussed by calculating the bond dissociation energies or energy barriers. The O−NO2 bond is the trigger bond for all of the compounds studied. Considering the energetic properties and stability, diethylene glycol tetranitrate, triethylene glycol hexanitrate, tetraethylene glycol octanitrate, pentaethylene glycol decanitrate and hexaethylene glycol dodecanitrate are potential energetic plasticizers for solid propellants. The influences of the −O−CH2−CH2− and −O−CH(ONO2)−CH(ONO2)− groups are also discussed, which will be helpful for the design of new highly energetic plasticizers by modifying the structures as required.
    Źródło:
    Central European Journal of Energetic Materials; 2019, 16, 2; 194-215
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approximate multi-Jensen-cubic mappings and a fixed point theorem
    Autorzy:
    Ramzanpour, Elahe
    Bodaghi, Abasalt
    Powiązania:
    https://bibliotekanauki.pl/articles/1797177.pdf
    Data publikacji:
    2020-04-02
    Wydawca:
    Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
    Tematy:
    Banach space
    multi-Jensen-cubic functional equation
    Hyers-Ulam stability
    Opis:
    In this paper, we introduce multi-Jensen-cubic mappings and unify the system of functional equations defining the multi-Jensen-cubic mapping to a single equation. Applying a fixed point theorem, we establish the generalized Hyers-Ulam stability of multi-Jensen-cubic mappings. As a known outcome, we show that every approximate multi-Jensen-cubic mapping can be multi-Jensen-cubic.
    Źródło:
    Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica; 2020, 19; 141-154
    2300-133X
    Pojawia się w:
    Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solution and Generalized Ulam-Hyers Stability of a Reciprocal Type Functional Equation in Non-Archimedean Fields
    Autorzy:
    Kumar, B. V. Senthil
    Ravi, K.
    Rassias, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193002.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Generalized Hyers-Ulam stability
    Reciprocal function
    Reciprocal type functional equation
    Opis:
    In this paper, we obtain the general solution of a reciprocal type functional equation of the type f(x+y)=f((k_1 x+k_2 y)/k)f((k_2 x+k_1 y)/k)/(f((k_1 x+k_2 y)/k)+f((k_2 x+k_1 y)/k) ) and investigate its generalized Ulam-Hyers stability in non-Archimedean fields where k>2, k_1 and k_2 are positive integers with k=k_1+k_2 and k_1≠k_2. We also establish Hyers-Ulam-Rassias stability, Ulam-Gavruta-Rassias stability and J.M. Rassias stability controlled by the mixed product-sum of powers of norms for the same equation.
    Źródło:
    World Scientific News; 2016, 31; 48-58
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differential difference inequalities related to parabolic functional differential equations
    Autorzy:
    Netka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/255915.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    parabolic functional differential equations
    method of lines
    stability and convergence
    Opis:
    Initial boundary value problems for nonlinear parabolic functional differential equations are transformed by discretization in space variables into systems of ordinary functional differential equations. A comparison theorem for differential difference inequalities is proved. Sufficient conditions for the convergence of the method of lines is given. Nonlinear estimates of the Perron type for given operators with respect to functional variables are used. Results obtained in the paper can be applied to differential integral problems and to equations with deviated variables.
    Źródło:
    Opuscula Mathematica; 2010, 30, 1; 95-115
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The equilibrium function as an indicator of symmetry of functional status of arm wrestlers
    Funkcja równowagi jako wskaźnik symetrii stanu czynnościowego zawodników siłujących się na rękę
    Autorzy:
    Chernogorov, D.N.
    Matveyev, Y.A.
    Bezzubov, A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/4623.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    sport
    physical development
    stability
    functional status
    arm wrestling
    athlete
    equilibrium
    Opis:
    The article is devoted to the study of asymmetry in physical development of arm wrestling athletes at the stage of sports perfection. It presents the results of a pedagogical experiment with the use of static motor-cognitive tests and stabilometry in the detection of asymmetry and proves the effectiveness of the developed system of physical training, based on the achieved improvements of the indicators of equilibrium function of arm wrestlers compared to the standard training system.
    Artykuł poświęcony jest badaniu asymetrii w rozwoju fizycznym zawodników siłujących się na rękę. Przedstawiono w nim wyniki eksperymentu pedagogicznego, w którym użyto testów statycznego rozpoznania ruchowego oraz stabilometrii w diagnozowaniu asymetrii i udowodniono efektywność opracowanego układu ćwiczeń fizycznych, opartego na progresie wskaźników funkcji równowagi zawodników siłujących się na rękę, w porównaniu do wyników osiągniętych przy pomocy standardowego systemu treningowego.
    Źródło:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Kultura Fizyczna; 2017, 16, 1
    1895-8680
    Pojawia się w:
    Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Kultura Fizyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability of the equation of homomorphism and completeness of the underlying space
    Autorzy:
    Moszner, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/255117.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    functional equation
    stability of equations of homomorphisms
    superstability
    complete vector spaces
    Opis:
    We prove that all assumptions of a Theorem of Forti and Schwaiger (cf. [4]) on the coherence of stability of the equation of homomorphism with the completeness of the space of values of all these homomorphisms, are essential. We give some generalizations of this theorem and certain examples of applications.
    Źródło:
    Opuscula Mathematica; 2008, 28, 1; 83-92
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantitative Lp stability analysis of a class of linear time-varying feedback systems
    Autorzy:
    Gurfil, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/908206.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    automatyka
    robotyka
    Lp stability
    time-varying Lur'e systems
    functional analysis
    Opis:
    The Lp stability of linear feedback systems with a single time-varying sector-bounded element is considered. A sufficient condition for Lp stability, with 1LpL Y, is obtained by utilizing the well-known small gain theorem. Based on the stability measure provided by this theorem, quantitative results that describe output-to-input relations are obtained. It is proved that if the linear time-invariant part of the system belongs to the class of proper positive real transfer functions with a single pole at the origin, the upper bound on the output-to-input ratio is constant. Thus, an explicit closed-form calculation of this bound for some simple particular case provides a powerful generalization for the more complex cases. The importance of the results is illustrated by an example taken from missile guidance theory.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2003, 13, 2; 179-184
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An approximate solution of the affine-quadratic control problem based on the concept of optimal damping
    Autorzy:
    Veremey, Evgeny I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1838175.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    feedback
    stability
    damping control
    functional
    optimization
    sprzężenie zwrotne
    kontrola tłumienia
    optymalizacja
    Opis:
    The paper is devoted to a particular case of the nonlinear and nonautonomous control law design problem based on the application of the optimization approach. Close attention is paid to the controlled plants, which are presented by affine-control mathematical models characterized by integral quadratic functionals. The proposed approach to controller design is based on the optimal damping concept firstly developed by V.I. Zubov in the early 1960s. A modern interpretation of this concept allows us to construct effective numerical procedures of control law synthesis initially oriented to practical implementation. The main contribution is the proposition of a new methodology for selecting the functional to be damped. The central idea is to perform parameterization of a set of admissible items for this functional. As a particular case, a new method of this parameterization has been developed, which can be used for constructing an approximate solution to the classical optimization problem. Applicability and effectiveness of the proposed approach are confirmed by a practical numerical example.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2021, 31, 1; 5-15
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An approximate solution of the affine-quadratic control problem based on the concept of optimal damping
    Autorzy:
    Veremey, Evgeny I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1838180.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    feedback
    stability
    damping control
    functional
    optimization
    sprzężenie zwrotne
    kontrola tłumienia
    optymalizacja
    Opis:
    The paper is devoted to a particular case of the nonlinear and nonautonomous control law design problem based on the application of the optimization approach. Close attention is paid to the controlled plants, which are presented by affine-control mathematical models characterized by integral quadratic functionals. The proposed approach to controller design is based on the optimal damping concept firstly developed by V.I. Zubov in the early 1960s. A modern interpretation of this concept allows us to construct effective numerical procedures of control law synthesis initially oriented to practical implementation. The main contribution is the proposition of a new methodology for selecting the functional to be damped. The central idea is to perform parameterization of a set of admissible items for this functional. As a particular case, a new method of this parameterization has been developed, which can be used for constructing an approximate solution to the classical optimization problem. Applicability and effectiveness of the proposed approach are confirmed by a practical numerical example.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2021, 31, 1; 5-15
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First principle analysis of electronic, optical and thermoelectric characteristics of XBiO3 (X = Al, Ga, In) perovskites
    Autorzy:
    Mahmood, Q.
    Rouf, S. A.
    Algrafy, E.
    Murtaza, G.
    Ramay, S. M.
    Mahmood, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818225.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    density functional theory
    structural stability
    optoelectronics
    thermoelectric applications
    indirect band gap semiconductors
    Opis:
    The perovskites XBiO3 (X = Al, Ga, In) have been studied in terms of mechanical, optical and thermoelectric behavior for energy harvesting application. Density functional theory is applied to study electronic, optical and thermoelectric properties of the studied materials. Structural, mechanical and thermodynamic stabilities are confirmed from the tolerance factor, Born mechanical stability and formation energy/specific heat capacity. Poisson and Plough ratios show the studied materials are ductile and have ability to withstand pressure. Band structure analysis shows the indirect band gap 3.0/2.1/1.0 eV for ABO/GBO/IBO. A complete set of optical spectra is reported by dielectric constants, refractive index, optical conduction, absorption of light and optical loss energy. Shifting of maximum absorption band to visible region increases the potential of perovskites XBiO3. Transport characteristics are also investigated by electrical conductivity, Seebeck coefficient and figure of merit.
    Źródło:
    Opto-Electronics Review; 2020, 28, 1; 8--14
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical approximations of parabolic functional differential equations on unbounded domains
    Autorzy:
    Baranowska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/745298.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    functional differential equations
    stability and convergence
    nonlinear estimates of the Perron type
    Opis:
    The paper is concerned with initial problems for nonlinear parabolic functional differential equations. A general class of difference methods is constructed. A theorem on the error estimate of approximate solutions for difference functional equations of the Volterra type with an unknown function of several variables is presented. The convergence of explicit difference schemes is proved by means of consistency and stability arguments. It is assumed that given function satisfy nonlinear estimates of the Perron type with respect to a functional variable. Results obtained in the paper can be applied to differential integral problems and equations with retarded variables. Numerical examples are presented.
    Źródło:
    Commentationes Mathematicae; 2007, 47, 2
    0373-8299
    Pojawia się w:
    Commentationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical approximations of difference functional equations and applications
    Autorzy:
    Kamont, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/255105.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    functional differential equations
    stability and convergence
    interpolating operators
    nonlinear estimates of Perron type
    Opis:
    We give a theorem on the error estimate of approximate solutions for difference functional equations of the Volterra type. We apply this general result in the investigation of the stability of difference schemes generated by nonlinear first order partial differential functional equations and by parabolic problems. We show that all known results on difference methods for initial or initial boundary value problems can be obtained as particular cases of this general and simple result. We assume that the right hand sides of equations satisfy nonlinear estimates of the Perron type with respect to functional variables.
    Źródło:
    Opuscula Mathematica; 2005, 25, 1; 109-130
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Criteria for Stability of Uncertain Linear Systems With Time-Varying Delay
    Autorzy:
    Han, Q. L.
    Gu, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/911198.pdf
    Data publikacji:
    2000
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    stabilność
    niepewność
    funkcja Lapunowa
    stability
    time-varying delay
    uncertainty
    linear matrix inequalities
    Lyapunov functional
    Opis:
    This paper focuses on the stability problem for uncertain linear systems with time-varying delays. Based on a discretized Lyapunov functional approach, delay-dependent criteria that are formulated in terms of linear matrix inequalities are proposed to guarantee asymptotic stability for such systems. Numerical examples are also included to show the effectiveness of the method.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2000, 10, 2; 205-225
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    LMI based control design for linear systems with distributed time delays
    Autorzy:
    Filasova, A.
    Gontkovič, D.
    Krokavec, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/229820.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    linear matrix inequality
    systems with distributed time delays
    Lyapunov-Krasovskii functional
    state control
    asymptotic stability
    Opis:
    The paper concerns the problem of stabilization of continuous-time linear systems with distributed time delays. Using extended form of the Lyapunov-Krasovskii functional candidate, the controller design conditions are derived and formulated with respect to the incidence of structured matrix variables in the linear matrix inequality formulation. The result give sufficient condition for stabilization of the system with distributed time delays. It is illustrated with a numerical example to note reduced conservatism in the system structure.
    Źródło:
    Archives of Control Sciences; 2012, 22, 2; 217-231
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust output feedback Model Predictive Control design
    Autorzy:
    Vesely, V.
    Rosinova, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/229853.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model predictive control
    robust control
    parameter dependent quadratic stability
    Lyapunov functional
    polytopic system
    decentralized control
    Opis:
    The paper addresses the problem of designing a robust output/state model predictive control for linear polytopic systems without constraints. The new robust BMI stability condition for given predictive and control horizon is derived which guarantees the parameter dependent quadratic stability and guaranteed cost.The proposed condition is appropriate for centralized and decentralized control design, as illustrated on example.
    Źródło:
    Archives of Control Sciences; 2010, 20, 3; 303-316
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability of solutions of infinite systems of nonlinear differential-functional equations of parabolic type
    Autorzy:
    Zabawa, T.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/254967.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    stability of solutions
    infinite systems
    parabolic equations
    elliptic equations
    semilinear differential-functional equations
    monotone iteration method
    Opis:
    A parabolic initial boundary value problem and an associated elliptic Dirichlet problem for an infinite weakly coupled system of semilinear differential-functional equations are considered. It is shown that the solutions of the parabolic problem is asymptotically stable and the limit of the solution of the parabolic problem as t → ∞ is the solution of the associated elliptic problem. The result is based on the monotone methods.
    Źródło:
    Opuscula Mathematica; 2006, 26, 1; 173-183
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Difference functional inequalities and applications
    Autorzy:
    Szafrańska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/255602.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    initial boundary value problems
    difference functional inequalities
    difference methods
    stability and convergence
    interpolating operators
    error estimates
    Opis:
    The paper deals with the difference inequalities generated by initial boundary value problems for hyperbolic nonlinear differential functional systems. We apply this result to investigate the stability of constructed difference schemes. The proof of the convergence of the difference method is based on the comparison technique, and the result for difference functional inequalities is used. Numerical examples are presented.
    Źródło:
    Opuscula Mathematica; 2014, 34, 2; 405-423
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Existence and Local Asymptotic Stability of Solutions of Fractional Order Integral Equations
    Autorzy:
    Abbas, Saı̈d
    Benchohra, Mouffak
    Powiązania:
    https://bibliotekanauki.pl/articles/745463.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    Functional integral equation
    Left-sided mixed Riemann-Liouville integral of fractional order
    Solution
    Local asymptotic stability
    Fixed point
    Opis:
    In this paper, we present some results concerning the existence and the local asymptotic stability of solutions for a functional integral equation of fractional order, by using some fixed point theorems.
    Źródło:
    Commentationes Mathematicae; 2012, 52, 1
    0373-8299
    Pojawia się w:
    Commentationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    LMI optimization problem of delay-dependent robust stability criteria for stochastic systems with polytopic and linear fractional uncertainties
    Autorzy:
    Balasubramaniam, P.
    Lakshmanan, S.
    Rakkiyappan, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/331417.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    opóźnienie zależne
    liniowa nierówność macierzowa
    system stochastyczny
    stabilność odporna
    delay-dependent stability
    linear matrix inequality
    Lyapunov-Krasovskii functional
    stochastic systems
    Opis:
    This paper studies an LMI optimization problem of delay-dependent robust stability criteria for stochastic systems with polytopic and linear fractional uncertainties. The delay is assumed to be time-varying and belong to a given interval, which means that lower and upper bounds of this interval time-varying delay are available. The uncertainty under consideration includes polytopic-type uncertainty and linear fractional norm-bounded uncertainty. Based on the new Lyapunov-Krasovskii functional, some inequality techniques and stochastic stability theory, delay-dependent stability criteria are obtained in terms of Linear Matrix Inequalities (LMIs). Moreover, the derivative of time delays is allowed to take any value. Finally, four numerical examples are given to illustrate the effectiveness of the proposed method and to show an improvement over some results found in the literature.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 2; 339-351
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implicit difference methods for infinite systems of hyperbolic functional differential equations
    Autorzy:
    Szafrańska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/745990.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    initial boundary value problems
    difference functional equations
    difference methods
    stability and convergence
    interpolating operators
    nonlinear estimates of the Perron type
    Opis:
    The paper deal with classical solutions of initial boundary value problems for infinite systems of nonlinear differential functional equations. Two types of difference schemes are constructed. First we show that solutions of our differential problem can be approximated by solutions of infinite difference functional schemes. In the second part of the paper we proof that solutions of finite difference systems approximate the solutions of aur differential problem. We give a complete convergence analysis for both types of difference methods. We adopt nonlinear estimates of the Perron type for given functions with respect to the functional variable. The proof of the stability is based on the comparison technique. Numerical examples are presented.
    Źródło:
    Commentationes Mathematicae; 2010, 50, 1
    0373-8299
    Pojawia się w:
    Commentationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On weak solutions of functional-differential abstract nonlocal Cauchy problems
    Autorzy:
    Byszewski, Ludwik
    Powiązania:
    https://bibliotekanauki.pl/articles/1310788.pdf
    Data publikacji:
    1997
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    abstract Cauchy problems
    functional-differential equation
    nonlocal conditions
    weak solutions
    existence
    uniqueness
    asympto tic stability
    m-accretive operators
    Banach contraction theorem
    Opis:
    The existence, uniqueness and asymptotic stability of weak solutions of functional-differential abstract nonlocal Cauchy problems in a Banach space are studied. Methods of m-accretive operators and the Banach contraction theorem are applied.
    Źródło:
    Annales Polonici Mathematici; 1996-1997, 65, 2; 163-170
    0066-2216
    Pojawia się w:
    Annales Polonici Mathematici
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approximate homomorphisms and derivation in multi-Banach algebras
    Autorzy:
    Agarwal, Ravi P.
    Cho, Yeol Je
    Park, Choonkil
    Saadati, Reza
    Powiązania:
    https://bibliotekanauki.pl/articles/1912850.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    Additive functional equation
    fixed point
    homomorphism in multi-Banach algebra
    generalized Hyers-Ulam stability
    derivation on multi-Banach algebra
    multi-normed space
    Opis:
    Using fixed point methods, we prove the generalized Hyers-Ulam stability of homomorphisms in multi-Banach algebras and derivations on multi-Banach algebras for the additive functional equation \[ \sum_{i=1}^m f\left(mx_i+\sum_{j=1, j\not=i}^m x_j\right) + f\left(\sum_{i=1}^m x_i\right) = 2 f \left(\sum_{i=1}^{m} mx_i\right) \] for each \(m\in \mathbb{N}\) with \(m\geq 2\).
    Źródło:
    Commentationes Mathematicae; 2011, 51, 1
    0373-8299
    Pojawia się w:
    Commentationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Matrices splitting the norm and their applications in the theory of stability of difference schemes
    Autorzy:
    Pokrzywa, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/747515.pdf
    Data publikacji:
    1985
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    Matrix norms, conditioning, scaling
    Norms of matrices, numerical range, applications of functional analysis to matrix theory
    Stability and convergence of difference methods
    Opis:
    .
    In a finite-dimensional real or complex linear normed space X there are characterized all the sets of operators A1,...,An which sum up to the identity operator and such that ||Aix||+...+||Anx|=||x|| for all xX. An example of application in the theory of stability of difference schemes is given.
    Źródło:
    Mathematica Applicanda; 1985, 13, 26
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observer-based controller design of time-delay systems with an interval time-varying delay
    Autorzy:
    Thuan, M. V.
    Phat, V. N.
    Trinh, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/331338.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sprzężenie zwrotne
    opóźnienie czasowo zależne
    liniowa nierówność macierzowa
    funkcjonał Lapunowa-Krasowskiego
    stabilność wykładnicza
    observer based feedback control
    interval time-varying delay
    linear matrix inequality
    Lyapunov-Krasovskii functional
    exponential stability
    Opis:
    This paper considers the problem of designing an observer-based output feedback controller to exponentially stabilize a class of linear systems with an interval time-varying delay in the state vector. The delay is assumed to vary within an interval with known lower and upper bounds. The time-varying delay is not required to be differentiable, nor should its lower bound be zero. By constructing a set of Lyapunov-Krasovskii functionals and utilizing the Newton-Leibniz formula, a delay-dependent stabilizability condition which is expressed in terms of Linear Matrix Inequalities (LMIs) is derived to ensure the closed-loop system is exponentially stable with a prescribed \alfa-convergence rate. The design of an observer based output feedback controller can be carried out in a systematic and computationally efficient manner via the use of an LMI-based algorithm. A numerical example is given to illustrate the design procedure.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 4; 921-927
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-35 z 35

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