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Wyszukujesz frazę "Torres, F." wg kryterium: Autor

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    Wyświetlanie 1-11 z 11
    Tytuł:
    A generalized fractional calculus of variations
    Autorzy:
    Odzijewicz, T.
    Malinowska, A. B.
    Torres, D. F. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/205955.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    generalized fractional operators fractional variational analysis
    Euler-Lagrange equations
    natural boundary conditions
    Noether's theorem
    damped harmonic oscillator
    Opis:
    We study incommensurate fractional variational problems in terms of a generalized fractional integral with Lagrangians depending on classical derivatives and generalized fractional integrals and derivatives. We obtain necessary optimality conditions for the basic and isoperimetric problems, transversality conditions for free boundary value problems, and a generalized Noether type theorem.
    Źródło:
    Control and Cybernetics; 2013, 42, 2; 443-458
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Existence of positive solutions to a discrete fractional boundary value problem and corresponding Lyapunov-type inequalities
    Autorzy:
    Chidouh, A.
    Torres, D. F. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/255913.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    fractional difference equations
    Lyapunov-type inequalities
    fractional boundary value problems
    positive solutions
    Opis:
    We prove existence of positive solutions to a boundary value problem depending on discrete fractional operators. Then, corresponding discrete fractional Lyapunov-type inequalities are obtained.
    Źródło:
    Opuscula Mathematica; 2018, 38, 1; 31-40
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New sauropod trackways from the Middle Jurassic of Portugal
    Autorzy:
    Santos, V F
    Moratalla, J.J.
    Royo-Torres, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/22749.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    new sauropod
    sauropod
    paleontology
    trackway
    Middle Jurassic
    Jurassic
    Portugal
    Dinosauria
    Sauropoda
    morphotype
    Opis:
    The Galinha tracksite reveals a sequence of Bajocian–Bathonian limestones belonging to the Serra de Aire Formation (West−Central Portugal) and is one of the few sites in the world where Middle Jurassic sauropod dinosaur tracks can be found. This tracksite is characterised by the presence of long, wide gauge sauropod trackways, the Middle Jurassic age of which suggests these dinosaurs were more widely distributed over time than previously thought. Two trackways contain unique pes and manus prints with morphologies that allow a new sauropod ichnotaxon to be described: Polyonyx gomesi igen. et isp. nov. On the basis of different manus/pes prints and trackway features, the proposal is made to subdivide Sauropodomorpha ichno−morphotypes into five groups: Tetrasauropus−like, Otozoum−like, Breviparopus/Parabrontopodus−like; Brontopodus−like, and Polyonyx−like. Polyonyx gomesi igen. et isp. nov. is thought to represent a nonneosauropod eusauropod, with a well developed manus digit I. The posterior orientation of this digit print suggests they were made by a eusauropod dinosaur with a posteriorly rotated pollex. The manus print morphologies observed in two trackways suggest a stage of manus structure intermediate between the primitive non−tubular sauropod manus and the tubular metacarpal arrangement characteristic of more derived sauropods. The low heteropody (manus:pes area ratio 1:2) of the trackway renders it possible they could have been made by eusauropods such as Turiasaurus riodevensis, which has a similar manus:pes area ratio. The Polyonyx igen. nov. trackway was made by non−neosauropod eusauropod, and suggests that wide gauge sauropod trackways were not exclusively made by Titanosauriformes.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 3; 409-422
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal control for a steady state dead oil isotherm problem
    Autorzy:
    Sidi Ammi, M. R.
    Malinowska, A. B.
    Torres, D. F. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/205514.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    dead oil isotherm problem
    optimal control
    existence and regularity of solutions
    necessary optimality conditions
    Opis:
    We study the optimal control of a steady-state dead oil isotherm problem. The problem is described by a system of nonlinear partial differential equations resulting from the traditional modelling of oil engineering within the framework of mechanics of a continuous medium. Existence and regularity results of the optima control are proved, as well as necessary optimality conditions.
    Źródło:
    Control and Cybernetics; 2013, 42, 2; 459-470
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quadratures of Pontryagin extremals for optimal control problems
    Autorzy:
    Rocha, E. A.
    Torres, D. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/969990.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    Noether's theorem
    Kozlov-Kolesnikov integrability
    integrability by quadratures
    optimal control
    Opis:
    We obtain a method to compute effective first integrals by combining Noether's principle with the Kozlov-Kolesnikov integrability theorem. A sufficient condition for the integrability by quadratures of optimal control problems with controls taking values on open sets is obtained. We illustrate our approach on some problems taken from the literature. An alternative proof of the integrability of the sub-Riemannian nilpotent Lie group of type (2,3,5) is also given.
    Źródło:
    Control and Cybernetics; 2006, 35, 4; 948-963
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simvastatin modulates β-catenin/MDR1 expression on spheres derived from CF41.Mg canine mammary carcinoma cells
    Autorzy:
    Cruz, P.
    Reyes, F.
    Torres, C.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087784.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    β-catenin
    MDR1
    simvastatin
    canine mammary carcinoma cells
    cancer stem cells
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 1; 95-99
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Symbolic computation of variational symmetries in optimal control
    Autorzy:
    Gouveia, P. D.
    Torres, D. F.
    Rocha, E. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/970020.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    sterowanie optymalne
    variational symmetries
    gauge term
    nonconservative forces
    computer algebra systems
    Noether's theorem
    first integrals
    optimal control
    Opis:
    We use a computer algebra system to compute, in an efficient way, optimal control variational symmetries up to a gauge term. The symmetries are then used to obtain families of Noether's first integrals, possibly in the presence of nonconservative external forces. As an application, we obtain eight independent first integrals for a sub-Riemannian nilpotent problem (2,3,5,8).
    Źródło:
    Control and Cybernetics; 2006, 35, 4; 831-849
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Terahertz Detection of Quantum Cascade Laser Emission by Plasma Waves in Field Effect Transistors
    Autorzy:
    Teppe, F.
    Consejo, C.
    Torres, J.
    Chenaud, B.
    Solignac, P.
    Fathololoumi, S.
    Wasilewski, Z.
    Zholudev, M.
    Dyakonova, N.
    Coquillat, D.
    El Fatimy, A.
    Buzatu, P.
    Chaubet, C.
    Knap, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492959.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.Tv
    07.57.Kp
    52.35.-g
    Opis:
    We report on the resonant detection of a 3.1 THz radiation produced by a quantum cascade laser using a 250 nm gate length GaAs/AlGaAs field effect transistor at liquid nitrogen temperature. We show that the physical mechanism of the detection is related to the plasma waves excited in the transistor channel. The detection is enhanced by increasing the drain current and driving the transistor into saturation regime. These results clearly show that plasma wave nanometer-size transistors can be used as detectors in all-solid-state terahertz systems where quantum cascade lasers act as sources.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 930-932
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THz Emission Induced by an Optical Beating in Nanometer-Length High-Electron-Mobility Transistors
    Autorzy:
    Nouvel, P.
    Torres, J.
    Marinchio, H.
    Laurent, T.
    Palermo, C.
    Varani, L.
    Teppe, F.
    Shiktorov, P.
    Starikov, E.
    Gruzinskis, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505652.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Nj
    72.20.Ht
    72.30.+q
    Opis:
    Experimental results of direct measurement of resonant terahertz emission optically excited in InGaAs HEMT channels are presented. The emission was attributed to two-dimensional plasma waves excited by photogeneration of electron-hole pairs in the HEMT channel at the frequency of the beating of two cw-laser sources. The presence of resonances for the radiation emission in the range of $f_0$ ± 10 GHz (with $f_0$ from 0.3 up to 0.5 THz) detected by a Si-bolometer is found. The intensity of THz emission exhibits a nonlinear growth with increase of the pumping power.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 199-202
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-dimensional Newtons problem of minimal resistance
    Autorzy:
    Silva, C. J.
    Torres, D. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/969988.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    Newton's problem of minimal resistance
    dimension two
    calculus of variations
    optimal control
    Opis:
    Newton's problem of minimal resistance is one of the first problems of optimal control: it was proposed, and its solution given, by Isaac Newton in his masterful Principia Mathematica, in 1686. The problem consists of determining, in dimension three, the shape of an axis-symmetric body, with assigned radius and height, which offers minimum resistance when it is moving in a resistant medium. The problem has a very rich history and is well documented in the literature. Of course, at a first glance, one suspects that the two dimensional case should be well known. Nevertheless, we have looked into numerous references and asked at least as many experts on the problem, and we have not been able to identify a single source. Solution was always plausible to everyone who thought about the problem, and writing it down was always thought not to be worthwhile. Here we show that this is not the case: the two-dimensional problem is richer than the classical one, being, in some sense, more interesting. Novelties include: (i) while in the classical three-dimensional problem only the restricted case makes sense (without restriction on the monotonicity of admissible functions the problem does not admit a local minimum), we prove that in dimension two the unrestricted problem is also well-posed when the ratio of height versus radius of base is greater than a given quantity; (ii) while in three dimensions the (restricted) problem has a unique solution, we show that in the restricted two-dimensional problem the minimizer is not always unique - when the height of the body is less or equal than its base radius, there exists infinitely many minimizing functions.
    Źródło:
    Control and Cybernetics; 2006, 35, 4; 965-975
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using visual and force information in robot-robot cooperation to build metallic structures
    Autorzy:
    Pomares, J.
    Gil, P.
    Corrales, J. A.
    Garcia, G. J.
    Puente, S. T.
    Torres, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/384655.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Opis:
    In this paper, a cooperative robot-robot approach to construct metallic structures is presented. In order to develop this task, a visual-force control system is proposed. The visual information is composed of an eye-in-hand camera, and a time of flight 3D camera. Both robots are equipped by a force sensor at the end-effector. In order to allow a human cooperate with both robots, an inertial motion capture system and an indoor localization system are em ployed. This multisensorial approach allows the robots to cooperatively construct the metallic structure in a flexible way and sharing the workspace with a human operator.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 3; 96-101
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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