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Artykuły w czasopismach na temat "Retard fractionnel"
Pskhu, A. V., i S. Sh Rekhviashvili. "Retarded Potentials in Fractional Electrodynamics". Moscow University Physics Bulletin 75, nr 4 (lipiec 2020): 316–19. http://dx.doi.org/10.3103/s0027134920040098.
Pełny tekst źródłaSchiavone, S. E. "Fractional powers of the retarded potential". Applicable Analysis 42, nr 1-4 (grudzień 1991): 145–55. http://dx.doi.org/10.1080/00036819108840038.
Pełny tekst źródłaSikora, Beata. "Controllability criteria for time–delay fractional systems with a retarded state". International Journal of Applied Mathematics and Computer Science 26, nr 3 (1.09.2016): 521–31. http://dx.doi.org/10.1515/amcs-2016-0036.
Pełny tekst źródłaJiang, Wei, i Zheng Xia Wang. "Image Denoising New Method Based on Fractional Partial Differential Equation". Advanced Materials Research 532-533 (czerwiec 2012): 797–802. http://dx.doi.org/10.4028/www.scientific.net/amr.532-533.797.
Pełny tekst źródłaNguyen, Van Quang, i Suchin Arunsawatwong. "Stability and Stabilization of Retarded Fractional Delay Differential Systems". IFAC Proceedings Volumes 41, nr 2 (2008): 3928–33. http://dx.doi.org/10.3182/20080706-5-kr-1001.00661.
Pełny tekst źródłaDhandapani, Prasantha Bharathi, Jayakumar Thippan, Dumitru Baleanu i Vinoth Sivakumar. "On a novel fuzzy fractional retarded delay epidemic model". AIMS Mathematics 7, nr 6 (2022): 10122–42. http://dx.doi.org/10.3934/math.2022563.
Pełny tekst źródłaTafesse, Simegne, i Nagarajan Sukavanam. "Approximate Controllability of Fractional Order Retarded Semilinear Control Systems". International Journal of Modern Nonlinear Theory and Application 02, nr 03 (2013): 153–60. http://dx.doi.org/10.4236/ijmnta.2013.23020.
Pełny tekst źródłaSubramanian, Shivaram, i Hanif D. Sherali. "A fractional programming approach for retail category price optimization". Journal of Global Optimization 48, nr 2 (21.11.2009): 263–77. http://dx.doi.org/10.1007/s10898-009-9491-2.
Pełny tekst źródłaKim, Daewook, i Jin-Mun Jeong. "Controllability for Retarded Semilinear Neutral Control Systems of Fractional Order in Hilbert Spaces". Mathematics 9, nr 6 (21.03.2021): 671. http://dx.doi.org/10.3390/math9060671.
Pełny tekst źródłaWang, Ying, Jingxiao Jiang, Zhi Cai i Kaifeng Zhang. "Fractional Prospect Theory-Based Bidding Strategy of Power Retail Company in the Uniform Pricing Electricity Market under Price Uncertainty". Fractal and Fractional 7, nr 3 (23.02.2023): 210. http://dx.doi.org/10.3390/fractalfract7030210.
Pełny tekst źródłaRozprawy doktorskie na temat "Retard fractionnel"
Bouldja, Nacera. "Slow Light in a SPS Photorefractive Crystal". Electronic Thesis or Diss., CentraleSupélec, 2020. http://www.theses.fr/2020CSUP0005.
Pełny tekst źródłaSlow light is the science domain that focuses on the physical nonlinear processes that canreduce the group velocity of a light pulse as it propagates in the medium. This discoveryhas been a great deal of recent interest for a wide range of applications such as opticalbuffering, nonlinear photonics and various types of spectroscopic.The slow light performance is typically measured through two key parameters: the valueof the delay or the group delay and the bandwidth of the output light pulse. This lastone is generally defined by the so-called fractional delay, which is the ratio between theoptical delay and the width of the output pulse. It is important to know that the opticaltelecommunication needs a slow light system that is able to slowdown short input lightpulses with therefore a large value of the fractional delay (FD).In the last years, numerous studies of slow light have been performed in several dispersivematerials at different wavelengths. In 1999, group velocities smaller than 17 m/s [1] havebeen experimentally measured by Hau et al. in an ultra-cold gas using ElectromagneticallyInduced Transparency. More recently, the deceleration of the light pulses has been alsosuccessfully observed in solid-state materials such as in optical fibers [2] and in photoniccrystals [3]. On the other hand, several studies have shown that photorefractive (PR)crystals can also be used to reduce the light propagation velocity at room temperature.As a matter of fact, the smallest group velocity of 0.025 cm/s has been achieved using therecording of refractive index gratings in a BaTiO3 photorefractive crystal [4]. This methodconsists of the coupling of a continuous pump beam and a probe signal to increase therefractive index dispersion and leads the generation of a photorefractive gain. However,this small group velocity is often accompanied by the output pulse distortion which reducesthe value of the fractional delay (FD of the order of 0.4 in [4]).This thesis focuses on the study of the methods which allow in addition to the decelerationgroup velocity, the limitation of the distortion of the pulse in a photorefractive (PR) media.First, using the two-wave mixing (TWM) method, the PR crystal with a response time of10 ms can slow down bright or dark pulses with duration of the order of ms. It is shownthat the value of the time delay and the width of the transmitted pulse can be controlledby the photorefractive gain and the input pulse duration. By improving the TWM setup,we measure a fractional delay of 0.79 and 1 respectively, for the bright and the dark pulseswith a duration close to the response time of the crystal. The beam fanning in a PRcrystal has also been used to slow down a single light pulse. The coupling between thebeam fanning and the input beam leads both to the modulation of the noisy refractiveindex gratings and to the slowing down of the output pulse. The use of beam fanning forlight slow down is new and significantly simplifies the slow light setup.Slow light with the TWM and the beam fanning can be observed for long pulses, typicallyfor a pulse of the order of the milliseconds and the seconds. In other words, only pulseswith durations around the crystal response time are slowed down. In this thesis, we showfor the first time that the use of the TWM at the nanosecond regime and a high laserintensity can reduce the photorefractive response time of the crystal and the slowdown ofa shorter pulse (with a width of ns). The results achieved in a PR crystal with a thicknessof 1 cm are similar to those achieved in slow light systems using a km-long optical fiberand for the same pulse durations
Myung, Young-soo, i Dong-wan Tcha. "Return on Investment Analysis for Facility Location". Massachusetts Institute of Technology, Operations Research Center, 1991. http://hdl.handle.net/1721.1/5306.
Pełny tekst źródłaNguyen, Le Ha Vy. "Stability and stabilization of several classes of fractional systems with delays". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112387/document.
Pełny tekst źródłaWe consider two classes of linear time-invariant fractional systems with commensurate orders and discrete delays. The first one consists of multi-input single-output fractional systems with output or input delays. The second one consists of single-input single-output fractional neutral systems with commensurate delays. We study the stabilization of the first class of systems using the factorization approach. We derive left and right coprime factorizations and Bézout factors, which are the elements to constitute the set of all stabilizing controllers. For the second class of systems, we are interested in the critical case where some chains of poles are asymptotic to the imaginary axis. First, we approximate asymptotic poles in order to determine their location relative to the axis. Then, when appropriate, necessary and sufficient conditions for H-infinity-stability are derived. This stability analysis is then extended to classical delay systems of the same form and finally a unified approach for both classes of neutral delay systems with commensurate delays (standard and fractional) is proposed. Next, the stabilization of a subclass of fractional neutral systems is studied. First, the set of all stabilizing controllers is derived. Second, we prove that a large class of fractional controllers with delays cannot eliminate in the closed loop chains of poles asymptotic to the imaginary axis if such chains are present in the controlled systems
Fioravanti, André. "H∞ analysis and control of time-delay systems by methods in frequency domain". Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00627352.
Pełny tekst źródłaTenoutit, Mammar. "Définition et réglage de correcteurs robustes d'ordre fractionnaire". Thesis, Poitiers, 2013. http://www.theses.fr/2013POIT2268.
Pełny tekst źródłaThe application of fractional calculus in automatic control have received much attention these last years, mainly in robust control. This PhD dissertation is a contribution to the control of integer order systems using a fractional order PID controller.The classical PID, well known for its applications to industrial plants, has been adapted to the fractional case as a PInDf controller, thanks to a fractional order reference model, characterized by its robustness to static gain variations.This new controller has been generalized to time delay systems as a fractional SMITH Predictor. In standard case, these controllers are adapted to first and second order systems, with or without a time delay. For more complex systems, two design methodologies have been proposed, based on the method of moments and on output feedback approach.For systems whose model is obtained by an identification procedure, the closed loop has to be robust to estimation errors. So, a worst-case model, derived from the covariance matrix of the estimator and the frequency uncertainty domains, has been proposed for the design of the controller.The different numerical simulations demonstrate that this methodology is able to provide robustness to static gain variations and to identification uncertainties
Bai, Jing. "Commande des Systèmes Multi-agent d'Ordre Fractionnaire". Thesis, Ecole centrale de Lille, 2015. http://www.theses.fr/2015ECLI0019/document.
Pełny tekst źródłaThis thesis focuses on the distributed coordination of fractional-order multi-agent systems under fixed directed communication graph. Firstly, formation producing with absolute damping and communication delay of fractional-order multi-agent systems is studied. A control law is proposed and some sufficient conditions are derived for achieving formation producing. However, in some scenarios, it might be desirable that all agents achieve formation and move as a group, instead of rendezvous at a stationary point. Therefore, secondly, formation producing with relative damping and communication delay is considered. Thirdly, consensus tracking of fractional-order multi-agent systems with a time-varying reference state is studied. A common control law and a control law based on error predictor are proposed, and it is shown that the control laws are effective when a communication graph has directed spanning trees. Meanwhile, it is proved that the convergence of systems is faster using the control law based on error predictor than by the common one. Finally, the above control laws are extended to achieve formation-tracking problems. In fact, in many cases information can be sent from a reference state to only its neighbor agents not to all the agents. In order to solve the above problem, an effective control law is given to achieve consensus with a constant reference state. Then, an effective general control law and an effective particular one are proposed to achieve consensus with a time-varying reference state. Furthermore, the above control laws are extended to achieve the formation tracking problems
Karangwa, Innocent. "Comparing South African financial markets behaviour to the geometric Brownian Motion Process". Thesis, University of the Western Cape, 2008. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_4787_1363778247.
Pełny tekst źródłaThis study examines the behaviour of the South African financial markets with regards to the Geometric Brownian motion process. It uses the daily, weekly, and monthly stock returns time series of some major securities trading in the South African financial market, more specifically the US dollar/Euro, JSE ALSI Total Returns Index, South African All Bond Index, Anglo American Corporation, Standard Bank, Sasol, US dollar Gold Price , Brent spot oil price, and South African white maize near future. The assumptions underlying the 
Geometric Brownian motion in finance, namely the stationarity, the normality and the independence of stock returns, are tested using both graphical (histograms and normal plots) 
and statistical test (Kolmogorov-Simirnov test, Box-Ljung statistic and Augmented Dickey-Fuller test) methods to check whether or not the Brownian motion as a model for South 
African financial markets holds. The Hurst exponent or independence index is also applied to support the results from the previous test. Theoretically, the independent or Geometric 
Brownian motion time series should be characterised by the Hurst exponent of ½
. A value of a Hurst exponent different from that would indicate the presence of long memory or 
fractional Brownian motion in a time series. The study shows that at least one assumption is violated when the Geometric Brownian motion process is examined assumption by 
assumption. It also reveals the presence of both long memory and random walk or Geometric Brownian motion in the South African financial markets returns when the Hurst index analysis is used and finds that the Currency market is the most efficient of the South African financial markets. The study concludes that although some assumptions underlying the 
rocess are violated, the Brownian motion as a model in South African financial markets can not be rejected. It can be accepted in some instances if some parameters such as the Hurst exponent are added.
Monteghetti, Florian. "Analysis and Discretization of Time-Domain Impedance Boundary Conditions in Aeroacoustics". Thesis, Toulouse, ISAE, 2018. http://www.theses.fr/2018ESAE0019.
Pełny tekst źródłaIn computational aeroacoustics, time-domain impedance boundary conditions (TDIBCs) canbe employed to model a locally reacting sound absorbing material. They enable to computethe effect of a material on the sound field after a homogenization distance and have proveneffective in noise level predictions. The broad objective of this work is to study the physical,mathematical, and computational aspects of TDIBCs, starting from the physical literature.The first part of this dissertation defines admissibility conditions for nonlinear TDIBCs underthe impedance, admittance, and scattering formulations. It then shows that linear physicalmodels, whose Laplace transforms are irrational, admit in the time domain a time-delayedoscillatory-diffusive representation and gives its physical interpretation. This analysis enablesto derive the discrete TDIBC best suited to a particular physical model, by contrast with a onesize-fits-all approach, and suggests elementary ways of computing the poles and weights. Theproposed time-local formulation consists in composing a set of ordinary differential equationswith a transport equation.The main contribution of the second part is the proof of the asymptotic stability of the multidimensionalwave equation coupled with various classes of admissible TDIBCs, whose Laplacetransforms are positive-real functions. The method of proof consists in formulating an abstractCauchy problem on an extended state space using a realization of the impedance, be it finiteor infinite-dimensional. The asymptotic stability of the corresponding strongly continuoussemigroup of contractions is then obtained by verifying the sufficient spectral conditions of theArendt-Batty-Lyubich-V˜u theorem.The third and last part of the dissertation tackles the discretization of the linearized Eulerequations with TDIBCs. It demonstrates the computational advantage of using the scatteringoperator over the impedance and admittance operators, even for nonlinear TDIBCs. This isachieved by a systematic semi-discrete energy analysis of the weak enforcement of a genericnonlinear TDIBC in a discontinuous Galerkin finite element method. In particular, the analysishighlights that the sole definition of a discrete model is not enough to fully define a TDIBC.To support the analysis, an elementary physical nonlinear scattering operator is derived andits computational properties are investigated in an impedance tube. Then, the derivation oftime-delayed broadband TDIBCs from physical reflection coefficient models is carried out forsingle degree of freedom acoustical liners. A high-order discretization of the derived time-localformulation, which consists in composing a set of ordinary differential equations with a transportequation, is applied to two flow ducts
Zamoum, Redouane. "Etude théorique des fluctuations de courant de l'admittance et de la densité d'états d'un nano-système en interaction". Phd thesis, Aix-Marseille Université, 2013. http://tel.archives-ouvertes.fr/tel-00881571.
Pełny tekst źródłaDe, Brito Cardeliquio Caetano. "Contributions to the Theory of Time-Delay Systems : Stability and Stabilisation". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC080/document.
Pełny tekst źródłaThe aim of this dissertation is to present new results on analysis and control design of time-delay systems. On the first part, we extend the use of a finite order LTI system, called 'comparison system', to design a controller which depends not only on the output at the present time and maximum delay, but also on an arbitrary number of values between those. This approach allows us to increase the maximum stable delay without requiring any additional information. The methods presented here consider time-delay systems control design with classical numeric routines based on Hoo theory. The second part of this work deals with a new approach to develop an envelope that engulfs all poles of a time-delay system. Through LMIs, we are able to determine envelopes for retarded and neutral time-delay systems. The envelopes proposed are not only tighter than the ones in the literature but, with our procedure, they can also be applied to verify the stability of the system and design state-feedback controllers which cope with design requirements regarding alpha-stability and are robust in face of parametric uncertainties. Fractional systems are also discussed for both chapters mentioned above. The third and last part studies stochastic time-delay systems.First we discuss continuous-time systems that are subjected to Markov jumps. We define stability and obtain LMIs for the state-feedback control in such a way that the relation with the transition rates between the modes is affine, allowing, therefore, to treat the case in which the rates are uncertain. We then discuss positive systems with delays, both for the continuous case as for the discrete case. Equivalent systems are obtained and delay dependent stability is addressed. A fair amount of examples are presented throughout the dissertation
Książki na temat "Retard fractionnel"
Lameire, Norbert, Raymond Vanholder i Wim Van Biesen. Clinical approach to the patient with acute kidney injury. Redaktor Norbert Lameire. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199592548.003.0222_update_001.
Pełny tekst źródłaCzęści książek na temat "Retard fractionnel"
Matušů, Radek, Bilal Senol, Baris Baykant Alagoz i Abdullah Ates. "Value Set-Based Numerical Analysis of Robust Stability for Fractional-Order Retarded Quasi-Polynomials with Uncertain Parameters and Uncertain Fractional Orders". W Lecture Notes in Networks and Systems, 18–23. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-90321-3_3.
Pełny tekst źródłaAvanessoff, David, André R. Fioravanti, Catherine Bonnet i Le Ha Vy Nguyen. "H ∞ -Stability Analysis of (Fractional) Delay Systems of Retarded and Neutral Type with the Matlab Toolbox YALTA". W Delay Systems, 285–97. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-01695-5_21.
Pełny tekst źródłaEl-Sayed, Ahmed M. A. "Nonlinear retarded functional differential equations of arbitrary (fractional) orders". W Equadiff 99, 1393–95. World Scientific Publishing Company, 2000. http://dx.doi.org/10.1142/9789812792617_0258.
Pełny tekst źródłaJayananda Singh, Samom, Rajesh Kumar i M. M. Dixit. "Study Analysis of Printed Monopole Antenna for C and X Band Application". W Frontiers in Artificial Intelligence and Applications. IOS Press, 2022. http://dx.doi.org/10.3233/faia220525.
Pełny tekst źródłaBora, Onur, M. Sedat Kabdaşlı, Nuray Gedik i Emel İrtem. "Floating Object Induced Hydro-morphological Effects in Approach Channel". W Fractional Calculus: New Applications in Understanding Nonlinear Phenomena, 232–50. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815051933122030013.
Pełny tekst źródłaNwajana, Augustine O., Emenike Raymond Obi, Gerald Kelechi Ijemaru, Emmanuel U. Oleka i Destiny Chidi Anthony. "Fundamentals of RF/Microwave Bandpass Filter Design". W Handbook of Research on 5G Networks and Advancements in Computing, Electronics, and Electrical Engineering, 149–64. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-6992-4.ch005.
Pełny tekst źródłaPestovska, Zoia, i Mariia Rahulina. "MANAGEMENT OF THE INVESTMENT PORTFOLIO OF INDIVIDUALS DURING INFLATION". W The scientific paradigm in the context of technological development and social change. Publishing House “Baltija Publishing”, 2023. http://dx.doi.org/10.30525/978-9934-26-297-5-10.
Pełny tekst źródłaStreszczenia konferencji na temat "Retard fractionnel"
Lorenzo, Carl F., i Tom T. Hartley. "Energy Considerations for Fractional Elements". W ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-13247.
Pełny tekst źródłaHarrington, Mark W., Nicolas Fontaine, Mikael Mazur i Daniel J. Blumenthal. "Optical Frequency Transfer Stability of 1E-15 at 1 Second Over Correlated Core Pairs in a 40 km 7-core Fiber Link". W Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ofc.2023.m3j.3.
Pełny tekst źródłaBusher, Victor, Vasily Horoshko, Anatoly Shestaka i Lubov Melnikova. "Fractional Integrated Dual Electromagnetic Retarder Controller for Tuning Internal Combustion Engines". W 2020 IEEE Problems of Automated Electrodrive. Theory and Practice (PAEP). IEEE, 2020. http://dx.doi.org/10.1109/paep49887.2020.9240785.
Pełny tekst źródłaHristova, Snezhana, i Cemil Tunc. "On the stability properties of retarded Volterra integro-fractional differential equations with Caputo derivative". W SEVENTH INTERNATIONAL CONFERENCE ON NEW TRENDS IN THE APPLICATIONS OF DIFFERENTIAL EQUATIONS IN SCIENCES (NTADES 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0040076.
Pełny tekst źródłaPapoulia, Katerina D., Vassilis P. Panoskaltsis i Igor Korovajchuk. "Some Equivalences in the Theory of Linear Viscoelasticity and Their Implications in Modeling and Simulation". W ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1191.
Pełny tekst źródłaYaşar, Aysu, i Kenan Terzioğlu. "Long Memory in Exchange Rate Volatility". W International Conference on Eurasian Economies. Eurasian Economists Association, 2021. http://dx.doi.org/10.36880/c13.02560.
Pełny tekst źródłaRaporty organizacyjne na temat "Retard fractionnel"
Picciotto, Sol. The Contested Shaping of International Tax Rules: The Growth of Services and the Revival of Fractional Apportionment. Institute of Development Studies (IDS), lipiec 2021. http://dx.doi.org/10.19088/ictd.2021.014.
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