Tesis sobre el tema "Dynamical transition"
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Proeme, Arno. "Nonequilibrium dynamical transition in the asymmetric exclusion process". Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/5286.
Texto completoFOMINA, Margarita. "THE PHYSICAL ORIGIN OF PROTEIN DYNAMICAL TRANSITION: A LIQUID-LIQUID TRANSITION IN HYDRATION WATER?" Doctoral thesis, Università degli Studi di Palermo, 2015. http://hdl.handle.net/10447/106561.
Texto completoMitchell, Radford. "Transition to turbulence and mixing in a quasi-two-dimensional Lorentz force-driven Kolmogorov flow". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49045.
Texto completoPark, Hyunhang. "Spin Systems far from Equilibrium: Aging and Dynamic Phase Transition". Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/19323.
Texto completoPh. D.
Brown, Roger Keith. "Triangular proximity-coupled arrays : phase transition in a magnetic field and dynamical properties /". The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu148726282507655.
Texto completoNájera, Ocampo Oscar. "Study of the dimer Hubbard Model within Dynamical Mean Field Theory and its application to VO₂". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS462/document.
Texto completoWe study in detail the solution of a basic strongly correlated model,namely, the dimer Hubbard model. This model is the simplest realization ofa cluster DMFT problem.We provide a detailed description of the solutions in the ``coexistentregion'' where two (meta)stable states of the DMFT equations are found, onea metal and the other an insulator. Moreover, we describe in detail howthese states break down at their respective critical lines. We clarify thekey role played by the intra-dimer correlation, which here acts in additionto the onsite Coulomb correlations.We review the important issue of the Mott-Peierls insulator crossoverwhere we characterize a variety of physical regimes. In a subtle change inthe electronic structure the Hubbard bands evolve from purely incoherent(Mott) to purely coherent (Peierls) through a state with unexpected mixedcharacter. We find a singlet pairing temperature T* below which thelocalized electrons at each atomic site can bind into a singlet and quenchtheir entropy, this uncovers a new paradigm of a para-magnetic Mottinsulator.Finally, we discuss the relevance of our results for the interpretation ofvarious experimental studies in VO₂. We present a variety of argumentsthat allow us to advance the conclusion that the long-lived (meta-stable)metallic phase, induced in pump-probe experiments, and the thermallyactivated M₁ meta-stable metallic state in nano-domains are the same.In fact, they may all be qualitatively described by the dimerizedcorrelated metal state of our model
Tan, Xiao. "Partitioning and Control for Dynamical Systems Evolving on Manifolds". Licentiate thesis, KTH, Reglerteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-283672.
Texto completoQC 20201012
Kreilos, Tobias [Verfasser] y Bruno [Akademischer Betreuer] Eckhardt. "Turbulence Transition in Shear Flows and Dynamical Systems Theory / Tobias Kreilos. Betreuer: Bruno Eckhardt". Marburg : Philipps-Universität Marburg, 2014. http://d-nb.info/1052995128/34.
Texto completoRusz, Ján, Shunsuke Muto y Kazuyoshi Tatsumi. "Energy Loss by Channeled Electrons: A Quantitative Study on Transition Metal Oxides". Cambridge University Press, 2013. http://hdl.handle.net/2237/20834.
Texto completoBorrero, Daniel. "Subcritical Transition to Turbulence in Taylor-Couette Flow". Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53140.
Texto completoGong, Xue. "Dynamical Systems in Cell Division Cycle, Winnerless Competition Models, and Tensor Approximations". Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1458303716.
Texto completoAl-Sawai, Wael. "Non-equilibrium Phase Transitions in Interacting Diffusions". Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7660.
Texto completoRestrepo, Lopez Ricardo. "Topics in spatial and dynamical phase transitions of interacting particle systems". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42729.
Texto completoHiruta, Yoshiki. "Dynamics and subcritical transition focusing on spatially-localized turbulence in two-dimensional Kolmogorov flow". Kyoto University, 2019. http://hdl.handle.net/2433/242590.
Texto completoKhapko, Taras. "Transition to turbulence in the asymptotic suction boundary layer". Licentiate thesis, KTH, Stabilitet, Transition, Kontroll, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141344.
Texto completoQC 20140213
Moles, Jordan. "On concentration inequalities for equilibrium states in lattice and symbolic dynamical systems". Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX102.
Texto completoThis thesis deals with the existence of Gaussian concentration for sufficiently mixing equilibrium states for lattice systems. Moreover, we show that such a property ensures uniqueness.In the first chapter, we show that if an equilibrium state associated to a shift-invariant and absolutely summable potential satisfies a Gaussian concentration bound then it is à fortiori mixing and unique em i.e. there is no phase transition.Thereafter, We study numerically a particular physical model which allows phase transition to occur: the ferromagnetic Ising model in two dimensions. We evaluate concentration constants through classical estimates at all temperature. Thank to the behavior of these parameters, we emphasize divergence of the Gaussian concentration constant at the critical temperature deduce that such property doesn't hold.Later on, we prove that the Gaussian concentration behavior holds for all temperature above the critical one for this model.Then, we dedicate a chapter to the study of an unidimensional symbolic dynamics on a finite alphabet: chains with complete connections. In particular, we study the concentration properties of a unique equilibrium state associated to a potential (or transition probability) satisfying Walters' condition.In the end, we review the high-noise regime in probabilistic cellular automata. In particular, we prove that in this regime, the probabilistic cellular automata satisfies a Gaussian concentration for a certain class of spatio-temporal observables
Masurel, Robin. "Role des hétérogénéités dynamiques dans la mécanique des polymères amorphes : modélisation et simulations par éléments finis". Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066001.
Texto completoAmorphous polymers present dynamical heterogeneities at the scale of 3 to 5nm near Tg. Their contributions to mechanical properties are still not well known. We thus consider a simple model where each dynamical heterogeneities has its own relaxation time randomly drawn is a log-normal time distribution. A coarse –grained model at the dynamical heterogeneity is then developed in the continuous medium approximation. Finite element simulations are performed to calculate macroscopic mechanical properties of amorphous polymers taking account of mechanical couplings between heterogeneities. We show that the glass transition is controlled by a percolation of slow domains. Mechanical couplings result in viscoelastic spectrum highly narrowed as compared to the microscopic one. In thin films of polymers, we evidence a slowdown of the dynamics of relaxation as compared to the bulk one. Considering that a high applied stress increase the dynamics of polymers, we show that dynamical heterogeneities result in an internal stress network. The latter is a consequence a plastic deformation and result in an internal energy which is not released after an unloading
Griffith, Daniel Todd. "New methods for estimation, modeling and validation of dynamical systems using automatic differentiation". Texas A&M University, 2004. http://hdl.handle.net/1969.1/1408.
Texto completoVieira, Ewerton Rocha 1987. "Transition matrix theory = Teoria da matriz de transição". [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/307536.
Texto completoTese (doutorado) - Universidade Estadual de Campinas, Instituto de Matemática Estatística e Computação Científica
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Resumo: Nessa tese, apresentamos uma unificação da teoria das matrizes de transição algébrica, singular, topológica e direcional ao introduzir a matriz de transição (generalizada), a qual engloba todas as quatros citadas anteriormente. Alguns resultados de existência são apresentados bem como a verificação de que cada matriz de transição supracitada são casos particulares da matriz de transição (generalizada). Além disso, nós abordamos como as aplicações das quatros matrizes de transiçao, na teoria do índice de Conley, se traduzem para a matriz de transição (generalizada). Quando a matriz de transição (generalizada) satisfizer o requerimento adicional de cobrir o isomorfismo do índice de Conley F definido pelo fluxo, pode-se provar propriedades de existência e de conexão de órbitas. Essa matriz de transição com a propriedade de cobrir o isomorfismo F é definida como matriz de transição topológica generalizada e a utilizamos para obter conexões de órbitas num fluxo Morse-Smale sem órbitas periódicas bem como para obter conexões de órbitas numa continuação associada à sequência espectral dinâmica
Abstract: In this thesis, we present a unification of the theory of algebraic, singular, topological and directional transition matrices by introducing the (generalized) transition matrix which encompasses each of the previous four. Some transition matrix existence results are presented as well as the verification that each of the previous transition matrices are cases of the (generalized) transition matrix. Furthermore, we address how applications of the previous transition matrices to the Conley Index theory carry over to the (generalized) transition matrix. When this more general transition matrix satisfies the additional requirement that it covers flow-defined Conley-index isomorphisms, one proves algebraic and connection-existence properties. These general transition matrices with this covering property are referred to as generalized topological transition matrices and are used to consider connecting orbits of Morse-Smale flows without periodic orbits, as well as those in a continuation associated to a dynamical spectral sequence
Doutorado
Matematica
Doutor em Matemática
Zhoroev, Tilekbek. "Controllability and Observability of Linear Nabla Discrete Fractional Systems". TopSCHOLAR®, 2019. https://digitalcommons.wku.edu/theses/3156.
Texto completoWesp, Christian [Verfasser], Carsten [Akademischer Betreuer] Greiner y Jürgen [Akademischer Betreuer] Schaffner-Bielich. "Dynamical simulation of a linear sigma model near the chiral phase transition / Christian Wesp. Gutachter: Carsten Greiner ; Jürgen Schaffner-Bielich". Frankfurt am Main : Univ.-Bibliothek Frankfurt am Main, 2015. http://d-nb.info/1079362495/34.
Texto completovan, Rooij Marieke M. J. W. "What Changes When We Change Our Decision Strategy? A Dynamical Account of Transitions between Risk-averse and Risk-seeking Choice Behavior". University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1382951052.
Texto completoFarano, Mirko. "Using nonlinear optimization to understand coherent structures in turbulence and transition". Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0047/document.
Texto completoThis thesis aims at unraveling the main mechanisms involved in transitional and turbulent flows. The central idea is that of using a nonlinear optimization technique to investigate the origin and role of coherent structures usually observed in these flows. This method has been used in three different contexts. First, a linearly stable laminar flow has been considered and the optimization has been used to compute the most amplified perturbations among all disturbances able to trigger transition to turbulence. Once turbulence is well established, a fully 3D nonlinear optimization maximizing the turbulent kinetic energy is used to study coherent structures populating turbulent shear flow as well as investigate the mechanisms responsible for the energy (optimally) growth and exchange. Then, a dynamical system approach is applied to fluid flow equations. The geometry of the state space is investigated by using transient growth theory to reveal the importance of the stable and unstable manifold. In the same framework, a nonlinear minimization algorithm is used to compute heteroclinic connections among invariant solutions of the Navier-Stokes equations
Conte, Riccardo. "A dynamical approach to the calculation of thermal reaction rate constants". Doctoral thesis, Scuola Normale Superiore, 2008. http://hdl.handle.net/11384/85794.
Texto completoRuscher, Céline. "The Voronoi liquid : a new model to probe the glass transition". Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAE027/document.
Texto completoUnderstanding the origin of the important slowing down of the dynamics near glass transition is still one of the remaining fundamental problems of condensed matter physics. During this work we introduced a brand-new model of liquids named Voronoi liquid, whose interactions are directly related to the geometrical properties of Voronoi tessellations. For these class of liquids interactions are intrinsically manybody and act in such a way that the liquid is always under tension but remains stable. The aim of this work is to use a binary mixture of the Voronoi liquid to see to what extend these exotic interactions may affect the classical scenario of glass transition. Throughout this work we characterize theoretically and by mean of numerical simulation the bidisperse Voronoi liquid. Comparisons with well-known Lennard-Jones glass formers are systematically performed
Sayer, Ryan Thomas. "Quantum Dynamics Using Lie Algebras, with Explorations in the Chaotic Behavior of Oscillators". BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3285.
Texto completoSANGIOVANNI, GIORGIO. "The electron-phonon interaction in strongly correlated electron systems". Doctoral thesis, La Sapienza, 2004. http://hdl.handle.net/11573/917137.
Texto completoLandes, François. "Viscoelastic Interfaces Driven in Disordered Media and Applications to Friction". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112171/document.
Texto completoMany complex systems respond to a continuous input of energy by an accumulation of stress over time, interrupted by sudden energy releases called avalanches. Recently, it has been pointed out that several basic features of avalanche dynamics are induced at the microscopic level by relaxation processes, which are neglected by most models. During my thesis, I studied two well-known models of avalanche dynamics, modified minimally by the inclusion of some forms of relaxation. The first system is that of a viscoelastic interface driven in a disordered medium. In mean-field, we prove that the interface has a periodic behaviour (with a new, emerging time scale), with avalanche events that span the whole system. We compute semi-analytically the friction force acting on this surface, and find that it is compatible with classical friction experiments. In finite dimensions (2D), the mean-field system-sized events become local, and numerical simulations give qualitative and quantitative results in good agreement with several important features of real earthquakes. The second system including a minimal form of relaxation consists in a toy model of avalanches: the Directed Percolation process. In our study of a non-Markovian variant of Directed Percolation, we observed that the universality class was modified but not completely. In particular, in the non-Markov case an exponent changes of value while several scaling relations still hold. This picture of an extended universality class obtained by the addition of a non-Markovian perturbation to the dynamics provides promising prospects for our first system
Holzer, Jenny Rebecca. "Scanning SQUID Microscope Measurements on Josephson Junction Arrays". University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin973710069.
Texto completoVanneuville, Hugo. "Percolation dans le plan : dynamiques, pavages aléatoires et lignes nodales". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1262/document.
Texto completoWe study three models of percolation in the plane: Bernoulli percolation, Voronoi percolation, and nodal lines percolation. Bernoulli percolation is often considered as the simplest model which admits a phase transition. Voronoi percolation is a Bernoulli percolation model in random environment. Nodal lines percolation is a level lines percolation model for smooth planar Gaussian fields. We have followed two main threads. The first one is the resarch of similarities between these models, having in mind that we expect that they admit the same scaling limit. We show for instance that the critical level for nodal lines percolation is the self-dual level (namely the zero level) if the Gaussian field is the Bargmann-Fock field, which is natural analytical field. The second main thread is the study of dynamics on these percolation models. We show in particular that if we sample a critical Voronoi percolation model and if we let each point move according to a long range stable Lévy process, then there exist exceptional times with an unbounded cluster
Thompson, Ian. "Dynamic phase transitions in biased ensembles of particle systems with repulsive interactions". Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665407.
Texto completoDelange, Pascal. "Many-electron effects in transition metal and rare earth compounds : Electronic structure, magnetic properties and point defects from first principles". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX040/document.
Texto completoThe topic of this thesis is the first-principles theory of the electronic structure of materials with strong electronic correlations. Tremendous progress has been made in this field thanks to modern implementations of Density Functional Theory (DFT). However, the DFT framework has some limits. First, it is designed to predict ground state but not excited state properties of materials, even though the latter may be just as important for many applications. Second, the approximate functionals used in actual calculations have more limited validity than conceptually exact DFT: in particular, they are not able to describe those materials where many-electron effects are most important.Since the 1990's, different many-body theories have been used to improve or complement DFT calculations of materials. One of the most significant non-perturbative methods is Dynamical Mean-Field Theory (DMFT), where a lattice model is self-consistently mapped onto an impurity model, producing good results if correlations are mostly local. We briefly review these methods in the first part of this thesis. Recent developments on DMFT and its extensions were aimed at better describing non-local effects, understanding out-of-equilibrium properties or describing real materials rather than model systems, among others. Here, we focus on the latter aspect.In order to describe real materials with DMFT, one typically needs to start with an electronic structure calculation that treats all the electrons of the system on the same footing, and apply a many-body correction on a well-chosen subspace of orbitals near the Fermi level. Defining such a low-energy subspace consistently requires to integrate out the motion of the electrons outside this subspace. Taking this into account correctly is crucial: it is, for instance, the screening by electrons outside the subspace strongly reduces the Coulomb interaction between electrons within the subspace. Yet it is a complex task, not least because DFT and DMFT are working on different observables. In the second part of this thesis, we discuss low-energy models in the context of the recently proposed Screened Exchange + DMFT scheme. In particular, we study the importance of non-local exchange and dynamically-screened Coulomb interactions. We illustrate this by discussing semi-core states in the d10 metals Zn and Cd.In the third and last part, we use the methods described above to study the electronic structure of three fundamentally and technologically important correlated materials. First, we discuss the physics of point defects in the paramagnetic phase of bcc Fe, more precisely the simplest of them: the monovacancy. Surprisingly for such a simple point defect, its formation energy had not yet been reported consistently from calculations and experiments. We show that this is due to subtle but nevertheless important correlation effects around the vacancy in the high-temperature paramagnetic phase, which is significantly more strongly correlated than the ferromagnetic phase where DFT calculations had been done.Second, we study the metal-insulator phase transition in the metastable VO2 B phase. We show that this transition is similar to that between the conventional rutile and M2 VO2 phases, involving both bonding physics in the dimer and an atom-selective Mott transition on the remaining V atoms. Motivated by recent calculations on SrVO3, we study the possible effect of oxygen vacancies on the electronic structure of VO2.Finally, we propose a scheme beyond DFT for calculating the crystal field splittings in rare earth intermetallics or oxides. While the magnitude of this splitting for the localized 4f shell of lanthanides does not typically exceed a few hundred Kelvin, it is crucial for their hard-magnetic properties. Using a modified Hubbard I approximation as DMFT solver, we avoid a nominally small but important self-interaction error, stressing again the importance of carefully tailored low-energy models
Fujiwara, Naoya. "Dynamic phase transition and pattern dynamics in periodic external fields". 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/135964.
Texto completoSouvatzis, Petros. "Electronic Structure and Lattice Dynamics of Elements and Compounds". Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8198.
Texto completoSuárez, Villagrán Martha Yolima 1984. "Estudos do modelo de Hubbard desordenado em duas dimensões". [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276990.
Texto completoTese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
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Resumo: Estudamos nesta tese alguns aspectos da transição metal-isolante de Mott no caso desordenado. O modelo no qual baseamos nosso estudo é o modelo de Hubbard desordenado, que é o modelo mais simples a apresentar a transição metal-isolante de Mott. Analisamos esse modelo através da Teoria Dinâmica de Campo Médio Estatística (StatDMFT). Essa teoria é uma extensão natural da Teoria Dinâmica de Campo Médio (DMFT), que foi usada com relativo sucesso nos últimos anos para analisar a transição de Mott no caso limpo. Como no caso dessa última, a StatDMFT incorpora os efeitos de correlação eletrônica apenas nos seus aspetos locais. A desordem é tratada de maneira a incorporar todos os efeitos de localização de Anderson. Com essa técnica, analisamos a transição de Mott desordenada no caso bi-dimensional, usando o Monte Carlo quântico para resolver os problemas de impureza única de Anderson requeridos pela StatDMFT. Encontramos as linhas espinodais nas quais o metal e o isolante deixam de ser meta-estáveis. Também estudamos os padrões espaciais das flutuações de quantidades locais, como a auto-energia e a função de Green local, e mostramos como há o aparecimento de regiões metálicas dentro do isolante e viceversa. Analisamos efeitos de tamanho finito e mostramos que, em consonância com os teoremas de Imry e Ma, a transição de primeira ordem desaparece no limite termodinâmico. Analisamos as propriedades de transporte desse sistema através de um mapeamento a um sistema de resistores aleatórios clássicos e calculamos a corrente média e sua distribuição através da transição metal-isolante. Finalmente, estudamos o comportamento da parede de domínio que se forma entre o isolante e o metal no caso limpo. Isso foi feito através de um modelo de uma cadeia unidimensional conectada a reservatórios, um metálico e um isolante, cada um em uma de suas extremidades. Nesse caso, utilizamos o método da Teoria de Perturbação Iterada para a solução dos modelos de impureza única. Encontramos o comportamento da parede como função da temperatura e das interações
Abstract: In this thesis, we studied some aspects of the Mott metal-insulator transition in the disordered case. The model on which we based our analysis is the disordered Hubbard model, which is the simplest model capable of capturing the Mott metal-insulator transition. We investigated this model through the Statistical Dynamical Mean-Field Theory (statDMFT). This theory is a natural extension of the Dynamical Mean-Field Theory (DMFT), which has been used with relative success in the last several years with the purpose of describing the Mott transition in the clean case. As is the case for the latter theory, the statDMFT incorporates the electronic correlation effects only incorporate Anderson localization effects.. With this technique, we analyzed the disordered two-dimensional Mott transition, using Quantum Monte Carlo to solve the associated single-impurity problems. We found the spinodal lines at which metal and insulator cease to be meta-stable. We also studied the spatial fluctuations of local quantities, such as the self-energy and the local Green¿s function, and showed the appearance of metallic regions within the insulator and vice-versa. We carried out an analysis of finite-size effects and showed that, in agreement with the theorems of Imry and Ma, the first-order transition is smeared in the thermodynamic limit. We analyzed transport properties by means of a mapping to a random classical resistor network and calculated both the average current and its distribution across the metalinsulator transition. Finally, we studied the behavior of the domain wall which forms between the metal and the insulator in the clean case. This was done by means of a model of a one-dimensional chain connected to two reservoirs, one metallic and the other insulating, each attached to one of the chain¿s ends. In this case, we used the Iterated Perturbation Theory technique in order to solve the associated singleimpurity problems. We then established the behavior of the domain wall width as a function of temperature and interactions
Doutorado
Física
Doutora em Ciências
Benzid, Khalif. "Etude de l'effet de l'anisotropie magnétique sur la phase dynamique et sur la phase géométrique des bits quantiques de spins électroniques d'ions de métaux de transition Mn2+, Co2+, Fe3+ isolés et des complexes d'ions Fe3+ dans l'oxyde de zinc monocristallin". Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAE009/document.
Texto completoWe studied by pulsed EPR (p-EPR), the quantum coherence of electronic spins qubits of isolated transition metal ions of Mn2+, Co2+, Fe3+ and Fe3+/Cs+ as well as Fe3+/Na+ complexes, all found as traces in mono-crystalline ZnO. Indeed, we experimentally demonstrated that the magnetic anisotropy can alter the coherence of the dynamic phase of electronic spins qubits. We found a small decoherence for Mn2+ and Fe3+, spins having a small uniaxial magnetic anisotropy, and on the contrary, we found a very strong decoherence for Co2+ spins having a very strong uniaxial magnetic anisotropy. We found that the electronic spins of the Fe3+/Cs+ complex, having a more complex tensor magnetic anisotropy compared to the simplest uniaxial one of isolated Fe3+ spins in ZnO, have almost the same coherence time. By the perturbation method, we have found theoretically an additional term to the usual geometric Berry phase, due to the magnetic anisotropy which exists in any system having a spin S>1/2
Rojas, Molina Constanza. "Etude mathématique des propriétés de transport des opérateurs de Schrödigner aléatoires avec structure quasi-cristalline". Thesis, Cergy-Pontoise, 2012. http://www.theses.fr/2012CERG0565/document.
Texto completoHis thesis is devoted to the study of electronic transport in non ergodic disordered models, in the framework of random Schrödinger operators.We start by reformulating the main tool in our study, the multiscale analysis, in the non ergodic setting. We establish suitable homogeneity conditions on the operator, in order to apply this method.Next, we study the spectral properties of non ergodic Delone-Anderson operators. These models represent a particle interacting with a medium whose atomic structure is quasi-crystalline and the nature of its impurities is disordered. In the case where the probability measures associated to the single-site potential are regular, in dimension 2 and under the effect of a magnetic field, we establish a metal-insulator transition and the existence of a mobility edge that separates the localization and delocalization regions. In arbitrary dimension, for regular and for Bernoulli single-site measures, we show dynamical localization at the bottom of the spectrum. Moreover, we obtain a quantitative lower bound on the size of the localization region in terms of the geometric parameters of the underlying Delone structure.We conclude this essay by studying the integrated density of states for Delone-Anderson models, using tools from the theory of dynamical systems associated to quasicrystals. Under certain conditions on the geometry of the underlying Delone set, we show the existence of the integrated density of states. Furthermore, in the case of a Delone-Anderson perturbation of the free Laplacian, we show it exhibits Lifshitz tails at the bottom of the spectrum
Khodadadi, Sheila. "Influence of Solvent on Protein Dynamics and Activity". University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1247697577.
Texto completoHines, Andrew Peter. "Entanglement, dynamical bifurcations and quantum phase transitions /". [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19792.pdf.
Texto completoBlythe, Richard Alexander. "Nonequilibrium phase transitions and dynamical scaling regimes". Thesis, University of Edinburgh, 2001. http://hdl.handle.net/1842/10834.
Texto completoShakhovoy, Roman. "Structural properties and dynamics of alkali sulfates". Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2029/document.
Texto completoThe main goal of a present research is a detailed study of ionic transfer in double sulfates belonging to the LIMSO₄ family, where M = Na, K, Rb, Cs. The most attention has been paid to LiNaSO₄ as to the most interesting (in terms of the ion dynamics) compound among other double sulfates. We have carried out magnetic relaxation measurements and line width analysis for all compounds under consideration. Moreover, PGF NMR measurements of ₇li and ²³Na self-diffusion coefficients in LiNaSO4 have been carried out. For the first time, we have measured the phase transition kinetics in LiNaSO₄. For this purpose, we developed a new technique, which is based on the difference of spin-lattice relaxation times in the two phases, but which does not involve the direct measurement of T₁. Elaborated technique allows measuring time evolution of the volume of the appearing phase at controlled cooling rates. We have carried out NMR study of the sulfate ion reorientations in the low-temperature modification of LiNaSO₄. The influence of the SO ₄² reorientational jumps on the quadrupolar interactions of 7Li nuclei was investigated b y a j ump reorientational model, which has not previously been app lied to sulfates. The proposed method is a “low-cost” technique, since it does not require an ¹⁷O enriched sample and dispenses with time-consuming ³³S NMR. Other advantage of a given method is a possibility to probe reorientational motions without NMR relaxation measurements. To analyze motional narrowing in solids with two diffusing spin sublattices (such case occurs, e.g., in LiNaSO₄) we deduced a formula, which can be used for fitting of the two-step temperature dependencies of the NMR line width. The obtained function has been al so ex tended to the case, when a distribution of correlation times takes place. The advantage of this approach is that even in the case of distribution of correlation times, the fitting function could be expressed in the analytical form
Smith, Kristin Elizabeth. "Full-time motherhood understanding transition dynamics /". College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3515.
Texto completoThesis research directed by: Sociology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
González, Gómez Andrés. "Nonlinear dynamics and smooth transition models". Doctoral thesis, Handelshögskolan i Stockholm, Ekonomisk Statistik (ES), 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:hhs:diva-541.
Texto completoDiss. Stockholm : Handelshögsk., 2004
Furukawa, Akira. "Phase Transition Dynamics of Complex Fluids". 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147797.
Texto completoGrote, Christoph. "Dynamic theories of the glass transition". Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318104.
Texto completoHung, Jui-Hsiang. "Efficient computational strategies enabling insights into the glass transition". University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1512640511831277.
Texto completoMillanes, Romero Alba 1986. "Heterochromatin dynamics during epithelial-to-mesenchymal transition". Doctoral thesis, Universitat Pompeu Fabra, 2014. http://hdl.handle.net/10803/129339.
Texto completoTot i estar enriquida en marques repressores, l’heterocromatina es transcriu activament i dóna lloc a grans quantitats d’ARNs no codificants. Aquests trànscrits són responsables de la formació i el manteniment de l’heterocromatina, però com es regula la seva transcripció segueix sent quelcom poc clarificat. En aquesta tesi demostrem que el factor de transcripció Snail1 reprimeix la transcripció pericentromèrica en cèl·lules de ratolí i regula l’organització de l’heterocromatina a través de l’acció de la LOXL2, que deamina l’H3K4. Snail1 té un paper clau en la transició epiteli-mesènquima (EMT). Aquí demostrem que, també durant aquest procés, Snail1 és responsable de la regulació de la transcripció pericentromèrica. A l’inici de l’EMT, l’HP1α, una de les principals proteïnes estructurals de l’heterocromatina, es desprèn de forma transitòria de l’heterocromatina. Aquest esdeveniment està regulat per Snail1 i LOXL2 i coincideix amb una disminució de la transcripció pericentromèrica. El bloqueig de la baixada dels trànscrits durant l’EMT compromet les capacitats migratòries i invasives de les cèl·lules mesenchimals que en resulten. Així doncs, proposem que Snail1 i LOXL2 regulen l’heterocromatina durant aquest procés, i així permeten que tingui lloc la reorganització genòmica que deu ser necessària per tal que es completi la EMT.
Moon, Chang Man. "Molecular dynamics study of phase transition phenomena". Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/12675.
Texto completoValiev, Damir. "Flame Dynamics and Deflagration-to-Detonation Transition". Doctoral thesis, Stockholm : Industriell teknik och management, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4875.
Texto completoHeyl, Markus Philip Ludwig [Verfasser] y Stefan [Akademischer Betreuer] Kehrein. "Nonequilibrium phenomena in many-body quantum systems : dynamics, thermodynamics, and dynamical phase transitions / Markus Philip Ludwig Heyl. Betreuer: Stefan Kehrein". München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2012. http://d-nb.info/1024658619/34.
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