Rozprawy doktorskie na temat „Long-Time stability”
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Cheng, Bin. "Long time stability of rotational Euler dynamics". College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/7155.
Pełny tekst źródłaThesis research directed by: Applied Mathematics and Scientific Computation Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
PESSANHA, JOSE EDUARDO ONODA. "VOLTAGE STABILITY PHENOMENON ANALYSIS: TRANSIENT AND LONG TERM TIME DOMAIN SIMULATION". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1997. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8941@1.
Pełny tekst źródłaEste trabalho analisa o fenômeno da estabilidade de tensão no domínio do tempo incluindo fenômenos rápidos (transitórios) e lentos (longo-termo). As diferentes formas de estabilidade existentes nos sistemas elétricos de potência são definidas e classificadas de acordo com a variável de interesse e com a amplitude do distúrbio. Utilizando-se um simples sistema elétrico de potência, verifica-se através de formulações dinâmicas fatores relevantes ao fenômeno da estabilidade de tensão. Investiga-se a influência de cargas do tipo potência constante e impedância constante sobre a estabilidade de tensão. Compensadores estáticos são incluídos nas análises e verifica-se a existência de regiões de operação onde as ações de controle não apresentam o efeito esperado. Investiga-se através de cenários o efeito adverso de dispositivos de controle com o limitador de sobre- excitação e o transformador de tape variável sobre a estabilidade de tensão. A partir de uma versão do programa de estabilidade transitória TRANSTAB, foram desenvolvidas duas versões do programa computacional VOLTDYN para simular no domínio do tempo o fenômeno da estabilidade de tensão. A primeira versão do programa Utiliza um algoritmo de integração de passo variável usando o método trapezoidal implícito enquanto que a segunda versão utiliza o método de Adams-Bashforth- Moulton. Diversos testes computacionais com as duas versões são realizados comprovando-se a importância desta forma de análise.
This work is concerned with voltage stability analysis in time domain including transient and long-term time frames. Different power system stability forms are defined and classified according to the variable of interest and with the disturbance magnitude. Using a simple power system model, it is shown through dynamics formulations important aspects of the voltage stability phenomenon. Important aspects of load characteristics of constant power type and mixed (constant power/constant impedance) type on voltage stability are investigated. A static compensator model is included in the analysis and it is verified that under specific operation conditions the control actions are not efficient. Scenarios show the adverse effects of long-term control devices such as overexcitation limiters and under load tap changers on voltage stability. One version of the transient stability program TRANSTAB is modified in order to simulate transient and long-term voltage phenomena. The resulting modified computer program is called VOLTDYN. Two versions of the VOLTDYN progran are available. The first version uses a variable step-size algorithm based on the trapezoidal method. The other includes a variable step-size algorithm based on the Adams- Bashforth-Moulton method.
Lee, Chihoon Budhiraja Amarjit. "Long time stability and control problems for stochastic networks in heavy traffic". Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,2308.
Pełny tekst źródłaTitle from electronic title page (viewed Jun. 26, 2009). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Statistics and Operations Research Statistics." Discipline: Statistics and Operations Research; Department/School: Statistics and Operations Research.
Tone, Florentina. "On the long-time stability of numerical schemes for the Navier-Stokes equations". [Bloomington, Ind.] : Indiana University, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219905.
Pełny tekst źródła"Title from dissertation home page (viewed June 28, 2007)." Source: Dissertation Abstracts International, Volume: 67-06, Section: B, page: 3172. Adviser: Roger Temam.
Chevalier, Samuel. "Using Real Time Statistical Data To Improve Long Term Voltage Stability In Stochastic Power Systems". ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/637.
Pełny tekst źródłaYarahmadian, Shantia. "Point wise Green function bounds and long-time stability of large-amplitude noncharacteristic boundary layers". [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3337271.
Pełny tekst źródłaTitle from PDF t.p. (viewed on Jul 28, 2009). Source: Dissertation Abstracts International, Volume: 69-12, Section: B, page: 7553. Adviser: Kevin Zumbrun.
Fedorchuk, Oleksiy [Verfasser]. "Investigations of the long-term stability of a Gas Electron Multipliers and double hit resolution for the highly granular Time-Projection Chamber / Oleksiy Fedorchuk". Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2019. http://d-nb.info/1223621138/34.
Pełny tekst źródłaRosas, Martinez Luis. "Study of two wave propagation problems in electromagnetic dispersive media : 1) Long-time stability analysis in Drude-Lorentz media; 2) Transmission between a slab of metamaterial on a dielectric". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAE011.
Pełny tekst źródłaThis PhD thesis addresses two independent problems related to wave propagation phenomena in dispersive media. In the first part, we investigate the long-time behavior of solutions of Maxwell’s equations in dissipative generalized Drude-Lorentz media. More precisely, we wish to quantify the loss in such media in terms of the decay rate of the electromagnetic energy for the corresponding Cauchy problem. This first part is in turn composed by two approaches. The first one, namely, the frequency dependent Lyapunov approach, consists in deriving a differential inequality (in time) for certain functionals of the solution, the Lyapunov functions L(k), where k is the spatial frequency. The stability estimates are then obtained from the time integration of the differential inequality. By developing this method, we obtain a polynomial stability result under strong dissipative assumptions. The second approach, the modal approach, exploits the spectral properties of the Hamiltonian operator appearing in the Cauchy problem. This last approach ameliorates the first one by considering weak dissipation assumptions. In the second part of the work, we are interested in the transmission problem of a slab of non-dissipative Drude metamaterial within a dielectric. In this context, we consider the TM two dimensional time-dependent Maxwell’s equations and we reformulate it into a Schrödinger equation whose Hamiltonian, A, is a unbounded self-adjoint operator. Fourier transform allow us to work with the reduced Hamiltonians A(k), k ∈ R. Finally, we are interested in the point spectrum of the reduced Hamiltonian which is related to the guided modes of the original problem. This study leads to a diseprsion relation whose difficulty lies in its highly non-linear character with respect to the spectral parameter. We prove the existence of a countable infinity of solution branches for the dispersion relation: the so-called dispersion curves. We give a precise analysis of these curves and enlighten the existence of guided waves which correspond to surface plasmons
Collot, Charles. "Sur l’explosion critique et surcritique pour les équations des ondes et de la chaleur semi-linéaires". Thesis, Université Côte d'Azur (ComUE), 2016. http://www.theses.fr/2016AZUR4095/document.
Pełny tekst źródłaThis thesis is devoted to the study of qualitative properties for solutions to the semilinear heat and wave equations. The results that are described are the following. The first two concern the existence and description of blow-up dynamics in which the radially symmetric stationary state is concentrated in finite time in the so-called energy supercritical regime; in addition, for the wave equation the stability of these phenomena is studied in the radial case, and for the heat equation the more general case of a bounded domain with Dirichlet condition at the boundary is considered. The third one deals with the classification of the possible dynamics near the radial stationary state for the heat equation in the so-called energy critical regime, where three scenarii occur: stabilization, instability by blow-up with the constant in space blow-up profile, and instability by dissipation to the null solution. Eventually, in the forth result we investigate the existence and the stability of self-similar blow-up profiles that are not constant in space, for the heat equation in the energy supercritical case
Esliker, Rebecca. "An Examination of Social Support, Contentment with Life and Time Spent in an Assisted Living Setting". ScholarWorks, 2015. https://scholarworks.waldenu.edu/dissertations/882.
Pełny tekst źródłaChytil, Jiří. "Digitálně řízený vícekvadrantový zdroj". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220262.
Pełny tekst źródłaFeng, Yuehong. "Stabilité de solutions régulières pour des systèmes d'Euler-Maxwell et de Navier-Stokes-Maxwell compressibles". Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22484/document.
Pełny tekst źródłaThis thesis is essentially composed of two parts dealing with Cauchy problems and periodic problems. In the first part, we study the stability of smooth solutions near non constant equilibrium states for a two-fluid isentropic compressible Euler-Maxwell system.By classical energy estimates together with an induction argument on the order of the derivatives of solutions, we prove the existence and uniqueness of global solutions to the system when the given initial data are near the equilibrium states. We also obtain the asymptotic behavior of solutions when the time goes to infinity. In the second part, we consider the long time stability of the global smooth solutions for compressible Euler-Maxwell and Navier-Stokes-Maxwell systems in non isentropic case when the equilibrium solutions are constants. With the help of suitable choices of symmetrizers and energy estimates, we prove the existence and uniqueness of global solutions to the systems with given small initial data. Furthermore, using the Duhamel principle and the Fourier analysis tool, we obtain the decay rates of smooth solutions as the time goes to infinity
Rohlén, Karl, i Pontus Ekdahl. "Uncovered Interest Parity and the Financial Crisis of 2007 : An econometric study of the robustness of the uncovered interest parity over different time periods, with varying economic stability". Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Nationalekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-44249.
Pełny tekst źródłaVelleret, Aurélien. "Mesures quasi-stationnaires et applications à la modélisation de l'évolution biologique". Thesis, Aix-Marseille, 2020. http://www.theses.fr/2020AIXM0226.
Pełny tekst źródłaI describe the long term behavior of several processes that model the mechanisms of natural selection. In the cases under consideration, one can interpret those selective effects as a conditioning which introduces a bias on the dynamics of some « neutral » stochastic process. This process evolves in a potentially very general space, notably continuous and unbounded. By these means, one can characterize the dynamics of the whole profile of individuals in the population of study as well as the profile of an individual uniformly chosen in the population. One can naturally see in these descriptions some brutal transitions of the distribution laws as time evolves, which makes the analysis much trickier than for the models without conditioning. The first part of this thesis consists in setting the conditions under which one can prove results analogous to the notion of stationarity while taking the conditioning into account. The second part is dedicated to the application of these criteria for a diversity of models of populations under selection and their interpretation. Examples of application include the mobile optimum model for adaptation to environmental change, a group selection model and Müller's ratchet model that describes how the sub-population unaffected by deleterious mutations can maintain itself
Calvo, García-Maroto Marta. "Analysis of long-term gravity records in europe : consequences for the retrieval of small amplitude and low frequency signals including the core resonance effects". Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAH003/document.
Pełny tekst źródłaThe study of temporal variations of gravity has a long tradition in Central Europe. Since the 1970s three main gravimeter types (spring, superconducting (SG) and absolute) have been set up at the J9 gravity station located in Strasbourg. These series allow us to review the instrumental improvements from the analyses of long term stability and instrumental drift. We show that the SG is the most powerful tool for thestudy of the low frequency and small amplitudes tides. We show the tidal analysis results for these tidal waves. We estimate the period of the Free Core Nutation and we seek the one of the Free Inner Core Nutation (FICN), which has not yet been observed. For this we make a careful study, in order to separate the low-amplitude waves in the vicinity of possible periods of FICN
La deformación elasto-gravitacional de la Tierra y las correspondientes variaciones temporales de la gravedad asociadas, registradas en la superficie terrestre mediante los gravímetros, son debidas a distintos fenómenos geofísicos con diferentes períodos y amplitudes, incluyendo entre otros a las denominadas mareas terrestres, que son el fenómeno que genera los efectos más fuertes (dichas mareas terrestres son los movimientos inducidos en la Tierra sólida y los cambios en su potencial gravitatorio derivados de las fuerzas de marea generadas por los cuerpos celestes).El objetivo principal de este trabajo consiste en mostrar la importancia tanto de la longitud de las series de datos de gravedad, como de la calidad de dichas series para mejorar nuestro conocimiento sobre la dinámica de la Tierra a través de los análisis de las mareas terrestres. [...]
Mayur, Manik. "Study of interface evolution between two immiscible fluids due to a time periodic electric field in a microfluidic channel". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00983473.
Pełny tekst źródła"Voltage stability phenomenon analysis: transient and long term time domain simulation". Tese, MAXWELL, 1997. http://www.maxwell.lambda.ele.puc-rio.br/cgi-bin/db2www/PRG_0991.D2W/SHOW?Cont=8941:pt&Mat=&Sys=&Nr=&Fun=&CdLinPrg=pt.
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