Дисертації з теми "Spectrum stability"
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Baldoni, Riccardo. "Investigation of spectral stability of X-ray tubes by simulations and experimental spectrum measurements." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10574/.
Повний текст джерелаGrünvogel, Stefan Michael. "Lyapunov spectrum and control sets." Augsburg [Germany] : Wissner-Verlag, 2000. http://catalog.hathitrust.org/api/volumes/oclc/45796984.html.
Повний текст джерелаChrysler, Benjamin D., Pelaez Silvana Ayala, Yuechen Wu, Shelby D. Vorndran, and Raymond K. Kostuk. "Environmental stability study of holographic solar spectrum splitting materials." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622712.
Повний текст джерелаKrombach, Patricia A. "Effects of Stability Balls on Children with Autism Spectrum Disorder." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6107.
Повний текст джерелаVronskaya, Maria. "Stability of singular spectrum analysis and causality in time series." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/52140/.
Повний текст джерелаMOLLOY, CYNTHIA ANN. "ASSESSMENT OF POSTURAL STABILITY IN CHILDREN WITH AUTISM SPECTRUM DISORDER." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1006206215.
Повний текст джерелаCramond, Alexander J. "The Longitudinal Stability of Memory in Males with Autism Spectrum Disorder." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3284.
Повний текст джерелаSong, Degong. "On the Spectrum of Neutron Transport Equations with Reflecting Boundary Conditions." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/26375.
Повний текст джерелаPh. D.
Feng, He. "A Study on Heterotic Target Space Duality – Bundle Stability/Holomorphy, F-theory and LG Spectra." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/102383.
Повний текст джерелаDoctor of Philosophy
Weldhagen, Gerhard Frederick. "Laboratory Detection and Gene Cassette Stability of the Novel Extended-Spectrum Beta-Lactamase, GES-2 from Pseudomonas aeruginosa." Thesis, University of Pretoria, 2004. http://hdl.handle.net/2263/29221.
Повний текст джерелаThesis (PhD (Medical Microbiology))--University of Pretoria, 2006.
Medical Microbiology
unrestricted
Smoot, Senia I. "Effect of an Acute Sensory Integration Therapy on the Postural Stability and Gaze Patterns of Children with Autism Spectrum Disorder." University of Dayton / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1386151416.
Повний текст джерелаBenoit, Valérie. "La brévicine 27, une bactériocine produite par Lactobacillus brevis SB27 : caractérisation, purification et éléments de structure chimique." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL101N.
Повний текст джерелаSingh, Navrag B. "Functional competency of lower limb musculature in the elderly." Doctoral thesis, Humboldt-Universität zu Berlin, Philosophische Fakultät IV, 2013. http://dx.doi.org/10.18452/16772.
Повний текст джерелаUndertaking activities is fundamental throughout daily living. In order to successfully perform these activities, continuous involvement of the human sensori-motor system (HSMS) is required. The HSMS involves feedback mechanisms to control numerous afferent and the efferent subsystems to ensure maintenance of balance and stability during both static and dynamic activities. Despite such control and stabilizing mechanisms, the kinematic and kinetic output of a task is not constant; instead variability occurs during continuous performance of both global tasks such as standing and walking, as well as local force production. The interpretation of variability during output task performance remains controversial, with larger levels of variability not always indicating deficits in human-motor performance. The aim of this dissertation was to assess variability during local as well as global task performance in static and dynamic settings. Furthermore, the association between the level of variability during local force production and variability during global tasks such as standing and walking was also investigated. The results within this dissertation showed that variability during task performance is modified in magnitude as well as in structure after perturbation due to fatigue, changes in environmental conditions, and aging, as well as in fall-prone elderly individuals. Furthermore, both high as well as low levels of variation constitute a key functional deficit among elderly individuals. This dissertation highlights the importance of considering trial-to-trial variations during continuous task performance as a key functional biomarker for motor-related pathologies. Effective assessment of such measures of variability in clinical settings could effectively complement current clinical practice for both early and effective identification of individuals with motor-related pathology, designing subject-specific rehabilitation programs, and evaluating therapy efficacy.
Al, Sheikh Lamis. "Scattering resonances and Pseudospectrum : stability and completeness aspects in optical and gravitational systems." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2022. http://www.theses.fr/2022UBFCK007.
Повний текст джерелаThe general context of this thesis is an effort to establish a bridge between gravitational andoptical physics, specifically in the context of scattering problems using as a guideline concepts andtools taken from the theory of non-self-adjoint operators. Our focus is on Quasi-Normal Modes(QNMs), namely the natural resonant modes of open leaky structures under linear perturbationssubject to outgoing boundary conditions. They also are referred to as scattering resonances.In the conservative self-adjoint case the spectral theorem guarantees the completeness andspectral stability of the associated normal modes. In this sense, a natural question in the non-self-adjoint setting refers to the characterization and assessment of appropriate notions of QNMcompleteness and spectral stability in open non-conservative systems. This defines the generalobjective of this thesis. To this aim, and in contrast with the traditional approach to scatter-ing resonances, we adopt a methodology in which QNMs are cast as a spectral problem of anappropriate non-self-adjoint operator. Specifically this methodology is based on following threeingredients:(i) Hyperboloidal approach: The hyperboloidal slicing approach is already used in gravitationalproblems, we introduced it here to optical ones. The idea is to study the wave equationin hyperbolic slices instead of usually used Cauchy slices. The system of coordinates ismore adapted to the problem of QNMs and its outgoing boundary conditions, in particularaddressing the exploding modes in the Cauchy approach. The modes are normalizable insuch coordinates and working in these slices eliminate the need of imposing the outgoingboundary conditions.(ii) Pseudospectrum of an operator: the notion of epsilon-pseudospectrum allows to assess the (in)stabilityof eigenvalues of an operator in the complex plane due to a perturbation to the operator oforder epsilon. This thesis introduces the notion of pseudospectrum in gravitational and opticalphysics in the vicinity of the eigenvalues.(iii) Numerical Chebyshev spectral methods: On the technical level, spectral methods providesan efficient tool when translating the problem into a numerical one. In particular we usedChebyshev basis to expand our fields.The results of this work touch three areas:(i) The instability of QNMs for some class of potentials. The fundamental modes are stablespecially under small "high frequency" perturbations, whereas overtones are sensitive tosuch perturbations. The instability of the overtones increases as their imaginary part grows.(ii) The universality of the asymptotic behaviour of QNMs and pseudospectrum. We remarkan asymptotically logarithmic behavior of pseudospectrum contour lines and bounding theopening QNMs branches from below.(iii) QNMs expansion. We revisit Lax & Phillips asymptotic resonant expansions of a "scattered field" in terms of QNMs in our physical settings. In particular , we make use of Keldysh expansion of the generalizations of the expressions for normal modes of conservative systems, specifically in terms of normalizable QNM eigenfunctions and explicit expressions for the excitation coefficients
Sauvage, Jean-Paul, and Jean-François Verchère. "Relations structure-stabilité dans les complexes molybdiques et tungstiques des glucides." Rouen, 1993. http://www.theses.fr/1993ROUES030.
Повний текст джерелаKhan, Mustayeen Ahmed. "Stabilite, spectres electroniques et structures des halogenocuprates en milieu protique." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13059.
Повний текст джерелаParveen, Tania. "Composite load model decomposition : induction motor contribution." Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/31301/1/Tania_Parveen_Thesis.pdf.
Повний текст джерелаSchwartz, Jean-Luc. "Représentations auditives de spectres vocaliques." Grenoble INPG, 1987. http://www.theses.fr/1987INPG0086.
Повний текст джерелаFerraresso, Francesco. "On the spectral stability of polyharmonic operators on singularly perturbed domains." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3426790.
Повний текст джерелаIn questa tesi si studia la dipendenza degli autovalori di operatori differenziali ellittici di ordine superiore da perturbazioni singolari del dominio, con attenzione per gli operatori poliarmonici e per condizioni al bordo di tipo intermedio e Neumann. Si identificano opportune condizioni geometriche sul dominio iniziale, sui domini perturbati e sulla perturbazione al fine di assicurare la stabilità spettrale. Si caratterizzano i problemi differenziali limite, al variare dei parametri che regolano la deformazione del dominio iniziale. Si dimostra che, assumendo opportune ipotesi, gli autovalori e le proiezioni sugli autospazi associati al problema differenziale nel dominio perturbato convergono ai rispettivi autovalori e proiezioni associati al problema limite nel dominio iniziale. Inoltre si dimostra che i risolventi convergono compattamente al risolvente associato al problema limite. In particolare, si analizza dapprima la convergenza spettrale di una famiglia di operatori autoaggiunti, ellittici, di ordine superiore, con condizioni al bordo di tipo intermedio, su domini perturbati definiti localmente dal sottografico di date funzioni. Si dimostra un teorema di stabilità spettrale assumendo che la convergenza delle funzioni che rappresentano localmente la frontiera convergano in modo sufficientemente regolare. Si utilizza poi tale risultato per studiare il comportamento spettrale di operatori poliarmonici con condizioni al bordo di tipo intermedio quando la frontiera del dominio è soggetta ad una oscillazione periodica e singolare, adattando delle tecniche utilizzate da J.M. Arrieta e P.D. Lamberti nel caso dell'operatore biarmonico. Si dimostra che il problema limite dipende dal rapporto tra l'ampiezza dell'oscillazione e il periodo di oscillazione. Infatti esiste un valore limite per questo rapporto al di sopra del quale si ha stabilità spettrale, cioè gli autovalori e le proiezioni sugli autospazi associati alla famiglia di domini perturbati convergono ai corrispondenti autovalori e proiezioni associati allo stesso operatore differenziale nel dominio limite; al di sotto di tale valore critico invece l'operatore differenziale limite è differente, in quanto assume condizioni al bordo diverse sulla frontiera del dominio limite. Infine se il rapporto assume esattamente il valore critico, appare un `termine strano' in una delle condizioni al bordo associate al problema limite, che è stato caratterizzato in funzione della soluzione di un dato problema al bordo ausiliario. In questo caso limite si sfruttano tecniche dimostrative tipiche dell'omogeneizzazione periodica, come il metodo di `unfolding' e le decomposizioni micro-macroscopiche delle funzioni di Sobolev, presenti, ad esempio, in alcuni articoli di J. Casado-Diaz e collaboratori. Nel piano euclideo si considerano inoltre l'operatore biarmonico e l'operatore associato al sistema di Reissner-Mindlin, con condizioni al bordo di tipo Neumann, su un dominio `a bilanciere', che consiste di due domini regolari, limitati e disgiunti, collegati attraverso un canale sottile. Si analizza il comportamento limite dello spettro degli operatori e si caratterizza il limite degli autovalori e delle proiezioni sugli autospazi quando la larghezza del canale diminuisce fino ad annullarsi, adattando tecniche introdotte da J.M. Arrieta e collaboratori per l'operatore di Laplace con condizioni al bordo di tipo Neumann. Nelle applicazioni alla teoria dell'elasticità lineare, gli operatori in considerazione sono collegati alla deformazione di una piastra elastica, di materiale omogeneo e non vincolata, dovuta alla degenerazione di una delle sue dimensioni. In contrasto con il caso dell'operatore di Laplace, l'equazione limite risulta distorta da un coefficiente strano, che dipende dal coefficiente di Poisson della piastra modellizzata.
Novickij, Jurij. "Hiperbolinės lygties su nelokaliosiomis kraštinėmis sąlygomis skirtuminio sprendinio stabilumas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2012~D_20140704_175149-44355.
Повний текст джерелаOn the stability of an explicit difference scheme for hyperbolic equation with integral conditions. The aim of the work is stability analysis of solution of finite difference method for hyperbolic equations. Trying to achieve formulated aim these tasks were solved: • a method of transformation of three-layered finite difference scheme into two-layered one was investigated; • a spectrum of transition matrix subject to the properties of second order differential operator Lambda was studied; • stability conditions of hyperbolic type equations with nonlocal conditions subject to boundary parameters were obtained; • numerical experiments, confirming theoretical derivations were made. Derived results could be used to solve one-dimensional tasks with hyperbolic equations in different sciences, to analyse spectrum structure of mathematical models and construct new numerical methods for solving hyperbolic PDEs.
Akil, Mohammad. "Quelques problèmes de stabilisation directe et indirecte d’équations d’ondes par des contrôles de type fractionnaire frontière ou de type Kelvin-Voight localisé." Thesis, Limoges, 2017. http://www.theses.fr/2017LIMO0043/document.
Повний текст джерелаThis thesis is devoted to study the stabilization of the system of waves equations with one boundary fractional damping acting on apart of the boundary of the domain and the stabilization of a system of waves equations with locally viscoelastic damping of Kelvin-Voight type. First, we study the stability of the multidimensional wave equation with boundary fractional damping acting on a part of the boundary of the domain. Second, we study the stability of the system of coupled onedimensional wave equation with one fractional damping acting on a part of the boundary of the domain. Next, we study the stability of the system of coupled multi-dimensional wave equation with one fractional damping acting on a part of the boundary of the domain. Finally, we study the stability of the multidimensional waves equations with locally viscoelastic damping of Kelvin-Voight is applied for one equation around the boundary of the domain
Lytle, Joshua W. "Stability for Traveling Waves." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/3063.
Повний текст джерелаNakano, Yushi. "Stochastic Stability of Partially Expanding Maps via Spectral Approaches." Kyoto University, 2015. http://hdl.handle.net/2433/200463.
Повний текст джерела0048
新制・課程博士
博士(人間・環境学)
甲第19200号
人博第741号
新制||人||178(附属図書館)
27||人博||741(吉田南総合図書館)
32192
京都大学大学院人間・環境学研究科共生人間学専攻
(主査)教授 宇敷 重廣, 教授 森本 芳則, 准教授 木坂 正史
学位規則第4条第1項該当
Hendricks, Jeffrey James. "Spectral Stability of Weak Detonations in the Majda Model." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3626.
Повний текст джерелаOrynbayev, Murat. "Spectral response characterization and stability of polymer-fullerene solar cells /." [Beersheba] : Ben-Gurion University of the Negev, 2006. http://aranne5.lib.ad.bgu.ac.il/others/OrynbayevMurat.pdf.
Повний текст джерелаHöwing, Johannes [Verfasser]. "Spectral Stability of Solitary Waves and Undercompressive Shocks / Johannes Höwing." Konstanz : Bibliothek der Universität Konstanz, 2013. http://d-nb.info/1037917707/34.
Повний текст джерелаChiquete, Carlos. "Stability and Receptivity of Idealized Detonations." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/145419.
Повний текст джерелаCorbett, Jennifer Leontine. "Sodium-cluster complexes : probability of formation, stability and mass spectra." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/41966.
Повний текст джерелаYamazoe, Shotaro. "Bifurcations and Spectral Stability of Solitary Waves in Nonlinear Wave Equations." Kyoto University, 2020. http://hdl.handle.net/2433/259759.
Повний текст джерелаFeleqi, Ermal. "Spectral stability estimates for the eigenfunctions of second order elliptic operators." Doctoral thesis, Università degli studi di Padova, 2009. http://hdl.handle.net/11577/3421876.
Повний текст джерелаLa tesi affronta una nuova direzione nel problema della stabilità spettrale degli operatori ellittici, precisamente di trovare stime per la variazione delle autofunzioni in seguito alla perturbazione del dominio. A differenza del problema della variazione degli autovalori, questo problema non era praticamente mai stato investigato in precedenza. L'approccio che è stato sviluppato nella tesi si basa sulla nozione di "gap'' tra operatori lineari. Questa nozione, che misura la vicinanza di due operatori lineari illimitati, si estende al caso di operatori definiti su domimi diversi. In seguito si ottengono delle stime per il gap tra operatori differenziali ellittici alle derivate parziali con condizioni al contorno di Dirichlet omogenee definiti su domini diversi. Ciò quindi permette di ottenere delle stime per la norma delle differenze degli autoproiettori e come conseguenza le stime volute per la norma delle differenze di appropriate autofunzioni di operatori definiti su domini diversi, stime espresse mediante caratteristiche geometiche dei domini, precisamente mediante potenza della distanza di Hausdorff-Pompeiu tra i bordi dei domini. I risultati ottenuti sono nuovi e molto interessanti e danno un buon contributo al problema della stabilità spettrale per operatori differenziali.
Bassam, Maya. "Étude de la stabilité de quelques systèmes d'équations des ondes couplées sur des domaines bornés et non bornés." Thesis, Valenciennes, 2014. http://www.theses.fr/2014VALE0034/document.
Повний текст джерелаThe thesis is driven mainly on indirect stabilization system of two coupled wave equations and the boundary stabilization of Rayleigh beam equation. In the case of stabilization of a coupled wave equations, the Control is introduced into the system directly on the edge of the field of a single equation in the case of a bounded domain or inside a single equation but in the case of an unbounded domain. The nature of thus coupled system depends on the coupling equations and arithmetic Nature of speeds of propagation, and this gives different results for the polynomial stability and the instability. In the case of stabilization of Rayleigh beam equation, we consider an equation with one control force acting on the edge of the area. First, using the asymptotic expansion of the eigenvalues and vectors of the uncontrolled system an observability result and a result of boundedness of the transfer function are obtained. Then a polynomial decay rate of the energy of the system is established. Then through a spectral study combined with a frequency method, optimality of the rate obtained is assured
Toumazou, Vincent. "Portraits spectraux de matrices : un outil d'analyse de la stabilité." Nancy 1, 1996. http://www.theses.fr/1996NAN10273.
Повний текст джерелаReizer, Gabriella v. "Stability Selection of the Number of Clusters." Digital Archive @ GSU, 2011. http://digitalarchive.gsu.edu/math_theses/98.
Повний текст джерелаIssa, Ibtissam. "Some results on the stabilization of elastic/viscoelastic transmission problems with Kelvin-Voigt or fractional Kelvin-Voigt damping." Thesis, Aix-Marseille, 2021. http://theses.univ-amu.fr.lama.univ-amu.fr/211207_ISSA_690cu840ucxbzr880kpmyt859oe_TH.pdf.
Повний текст джерелаThis thesis is devoted to study the stabilization of some locally coupled systems. First, we study the stability of a one-dimensional coupled wave equations with two interior non smooth viscous dampings where we establish exponential stability. Second, we study the stabilization of a locally coupled wave equations with only one internal viscoelastic damping of Kelvin-Voigt type. Both the damping and the coupling coefficients are non smooth. Using a spectrum approach, we prove the non-uniform stability of the system. Next, using a frequency domain approach, combined with a piecewise multiplier technique and the construction of a new multiplier satisfying some ordinary differential equations, we show that the energy of the smooth solution of the system decays polynomially. Third, we investigate the energy decay of hyperbolic systems of wave-wave, wave-Euler Bernoulli beam and beam-beam types. Indeed, the two equations are coupled through boundary connection with only one localized non smooth fractional Kelvin Voigt damping. We establish a polynomial energy decay rate. Finally, we study the stability of a multidimensional system of two wave equations coupled by velocities with only one localized non-smooth Kelvin-Voigt damping. By using a spectral analysis, we prove the non uniform stability of the system. Further, using a frequency domain approach combined with a multiplier technique, we establish some polynomial stability results by considering different geometric conditions on the coupling and the damping domains. In addition, in the absence of any geometric condition, we establish two polynomial energy decay rates of the system on a square domain
Lerbinger, Klaus. "Problèmes spectraux en MHD : effets non idéaux, stabilité du kink interne." Paris 11, 1988. http://www.theses.fr/1988PA112109.
Повний текст джерелаXiao, Lan. "Etude physico-chimique de la complexation de divers ions metalliques (cu**(2+), ni**(2+) et co**(2+)) avec des dipeptides l-l contenant des chaines laterales non-coordinantes." Paris 7, 1988. http://www.theses.fr/1988PA077170.
Повний текст джерелаKhan, Mustayeen Ahmed. "Stabilité, spectres électroniques et structures des halogénocuprates en milieu protique." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37614662r.
Повний текст джерелаWächtler, Johannes [Verfasser]. "Spectral stability of small-amplitude traveling waves via geometric singular perturbation theory / Johannes Wächtler." Konstanz : Bibliothek der Universität Konstanz, 2012. http://d-nb.info/1024853799/34.
Повний текст джерелаArnqvist, Johan. "Mean Wind and Turbulence Conditions in the Boundary Layer above Forests." Doctoral thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-237764.
Повний текст джерелаVindforsk III, Wind power in forests
Vindforsk IV, Forest wind
Řehák, Petr. "Prvoprincipiální analýza stability krystalů pevných látek." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-234177.
Повний текст джерелаVenzl, Hannah [Verfasser], and Andreas [Akademischer Betreuer] Buchleitner. "Ultracold bosons in tilted optical lattices – impact of spectral statistics on simulability, stability, and dynamics = Ultrakalte Bosonen in optischen Gittern - der Einfluss spektraler Statistik auf Simulierbarkeit, Stabilität und Dynamik." Freiburg : Universität, 2011. http://d-nb.info/1123459029/34.
Повний текст джерелаLiefvendahl, Mattias. "Stability results for viscous shock waves and plane Couette flow." Doctoral thesis, Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3241.
Повний текст джерелаKlaiber, Andreas [Verfasser]. "On the Spectral Stability of Internal Solitary Waves in Fluids with Density Stratification / Andreas Klaiber." Konstanz : Bibliothek der Universität Konstanz, 2013. http://d-nb.info/1045840556/34.
Повний текст джерелаLerbinger, Klaus. "Problèmes spectraux en MHD effets non idéaux, stabilité du Kink interne /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376152381.
Повний текст джерелаOGNIBENE, ROBERTO. "Monotonicity formulas and blow-up methods for the study of spectral stability and fractional obstacle problems." Doctoral thesis, Università degli studi di Pavia, 2021. http://hdl.handle.net/11571/1431735.
Повний текст джерелаHagen, Thomas Ch. "Elongational Flows in Polymer Processing." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/29437.
Повний текст джерелаPh. D.
Portmann, Fabian. "Spectral Inequalities and Their Applications in Quantum Mechanics." Doctoral thesis, KTH, Matematik (Avd.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145210.
Повний текст джерелаQC 20140520
Ford, Wesley. "The Advancement of Stable, Efficient and Parallel Acceleration Methods for the Neutron Transport Equation." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX105/document.
Повний текст джерелаIn this paper we propose a new library of non-linear techniques for accelerating the discrete-ordinates transport equation. Two new types of nonlinear acceleration methods called Spatially Variant Rebalancing Method (SVRM) and Response Matrix Acceleration (RMA), respectively, are proposed and investigated. The first method, SVRM, is based on the computation of the zeroth and first order spatial variation of the neutron balance equation. RMA, is a DP0 method that uses knowledge of the transport operator to form a consistent relationship. Two distinct variants of RMA, called Explicit-RMA (E-RMA) and Balance (B-RMA), respectively, are derived. The convergence properties of both acceleration methods are investigated for two different iteration schemes of the method of characteristics (MOC) transport operator for a 1D slab, using spectral and Fourier analysis. Based off the results of the 1D comparison, only RMA and CMFD were implemented in the library. The performance of RMA is compared to CMFD using the C5G7, ZPPR, and UH12 3D benchmarks. Both parallel and sequential solving schemes are considered. Analysis of the results indicates that both variants of RMA have improved effectiveness and stability relative to CMFD, for optically diffusive materials. Moreover, RMA shows great improvement in stability and effectiveness when the geometry is spatially decomposed. To achieve optimal numerical performance, a combination of RMA and CMFD is suggested. Further investigation into the use and improvement of RMA is proposed. As well, many ideas for extending the features of the library are presented
Řehák, Petr. "Stabilita krystalů pevných látek z prvních principů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228571.
Повний текст джерелаHao, Zhaopeng. "High-order numerical methods for integral fractional Laplacian: algorithm and analysis." Digital WPI, 2020. https://digitalcommons.wpi.edu/etd-dissertations/612.
Повний текст джерела