Tesi sul tema "Correlations"
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Toy, Randy Scott. "CORRELATIONS". VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd_retro/7.
Testo completoHystad, Grethe. "Periodic Ising Correlations". Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/196130.
Testo completoMartinsson, Engshagen Jan. "Nothing is normal in nance! : On Tail Correlations and Robust Higher Order Moments in Normal Portfolio Frameworks". Thesis, KTH, Matematik (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102699.
Testo completoPerarnau, Llobet Martí. "Thermodynamics and quantum correlations". Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/404732.
Testo completoLa termodinàmica va néixer com una teoria dedicada a l'estudi de cossos macroscòpics en equilibri tèrmic. A partir d'aquell moment, l'abast de la teoria no ha deixat d'augmentar, aplicant-se en l'actualitat a gran part de les disciplines científiques, així com a objectes de mides extremadament diferents. La present tesis està dedicada a l'estudi de la termodinàmica de sistemes quàntics. Conté resultats originals en diferents temes, que inclouen l'extracció de treball de sistemes quàntics, les fluctuacions de treball, la relació entre l'energia i les correlacions quàntiques, i la termodinàmica de sistemes de molts cossos. La primera part de la tesis està dedicada a l'estudi de l'extracció de treball de sistemes quàntics. En aquest context la noció d'estat passiu (un estat del qual no es pot extreure treball) és fonamental. Primer de tot, caracteritzem el conjunt d'estats passius, i en particular trobem els més energètics, que es troben a l'altre extrem dels estats tèrmics (o de Gibbs). Notablement, els estats passius poden ser activats, en el sentit que es pot extreure treball d'un conjunt suficientment gran de còpies d'un estat passiu. Estudiant en detall l'esmentat procés d'activació, trobem una relació entre la velocitat del procés i l'entrellaçament generat. Seguidament, considerem la possibilitat d'extreure treball d'un sistema utilitzant un bany tèrmic. En aquest cas, d'acord amb la segona llei de la termodinàmica, la quantitat de treball està limitada per l'energia lliure. Per sistemes quàntics, en molts casos no és possible extreure tota l'energia lliure, i desenvolupem correccions de la segona llei que depenen només de la mida del bany i de la seva estructura. A continuació estudiem les fluctuacions termodinàmiques (en particular del treball), que són especialment rellevants per sistemes microscòpics. La seva descripció en el règim quàntic és especialment difícil, donat que les mesures tenen un efecte invasiu en l'estat. De fet, mostrem que és impossible mesurar exactament les fluctuacions d'energia en processos que involucren coherència quàntica. Malgrat aquest resultat, també desenvolupem un sistema per mesurar les fluctuacions del treball de forma aproximada. Una part important d'aquesta tesis està dedicada a la relació entre les correlacions (quàntiques) i el treball. Comencem considerant un conjunt d'estats correlacionats, que individualment es troben en un estat tèrmic. La motivació és que en aquest cas el treball contingut en els estats prové únicament de les correlacions. En aquest escenari, calculem la quantitat de treball que es pot extreure d'estats entrellaçats, estats separables i estats correlacionats amb una determinada entropia. És a dir, calculem el treball màxim que es pot extreure de les correlacions, tan clàssiques com quàntiques. A continuació, considerem el procés invers, és a dir, la creació de correlacions en estats tèrmics. En aquest cas derivem límits en la temperatura màxima per poder crear diferents tipus entrellaçament, i el corresponent cost energètic. Finalment, estudiem la termodinàmica de sistemes de molts cossos. Aquí fem servir un dels resultats més importants relacionats amb l'equilibració en sistemes quàntics: sistemes quàntics tancats que involucren moltes partícules no arriben a l'equilibri, però es comporten com si hi haguessin arribat per la majoria d'observables (incloent observables rellevants des d'un punt de vista físic com l'energia). Tanmateix, el corresponent estat d'equilibri no és sempre tèrmic, i a vegades només es pot descriure mitjançant un estat generalitzat de Gibbs (GGE). La nostra contribució consisteix en desenvolupar un formalisme que permet estudiar la producció d'entropia i l'extracció del treball en estats GGE, el qual apliquem a sistemes de fermions.
Matte, Robert. "Correlations and multifractal measures". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56945.
Testo completoParker, Jane Ker. "Crystal structure reactivity correlations". Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316782.
Testo completoLothian, Paul James Gillougley. "On correlations of sequences". Thesis, Royal Holloway, University of London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286326.
Testo completoEkert, Artur Konrad. "Correlations in quantum optics". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293479.
Testo completoSaunders, Christopher Glenn. "Magnetostructural Correlations in Tetrahalocuprates". Thesis, University of Canterbury. Chemistry, 2012. http://hdl.handle.net/10092/8651.
Testo completoHughes, John Rhys. "Octupole correlations in '2'2'5Th". Thesis, University of York, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235660.
Testo completoJones, Nicholas Steven. "Correlations : quantum and classical". Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424643.
Testo completoMenga, Marina. "Entanglement detection measuring classical correlations". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13510/.
Testo completoTröster, Tilman. "Weak gravitational lensing cross-correlations". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62592.
Testo completoScience, Faculty of
Physics and Astronomy, Department of
Graduate
Korkusinski, Marek. "Correlations in semiconductor quantum dots". Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/29128.
Testo completoSloggett, Clare Physics Faculty of Science UNSW. "Electron correlations in mesoscopic systems". Awarded by:University of New South Wales. School of Physics, 2007. http://handle.unsw.edu.au/1959.4/31875.
Testo completoSyratt, Richard William. "Angular correlations of speckle patterns". Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261820.
Testo completoGirolami, Davide. "Quantum correlations in information theory". Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13397/.
Testo completoTipton, Denver Leonard John. "Electron correlations in quantum dots". Thesis, King's College London (University of London), 2001. https://kclpure.kcl.ac.uk/portal/en/theses/electron-correlations-in-quantum-dots(b6e1a547-fbb8-41f7-9d2b-f235b68b85be).html.
Testo completoNorrköping, Symfoniorkestern. "Quantum correlations in various systems". Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411371.
Testo completoStratton, B. "Aspects of structure-reactivity correlations". Thesis, University of East Anglia, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382852.
Testo completoThirukkonda, Sreeram (Sreeram Radhakrishnan) 1975. "Correlations in firm default behavior". Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55245.
Testo completoCataloged from PDF version of thesis.
Includes bibliographical references (p. 67-68).
Modeling credit risk using Structural and Reduced Form models has been a popular and apropos topic of research. This work makes an attempt to better understand correlations in firm default. A review of contemporary research reveals several models with varying degrees of assumptions around firm default and how they relate to macroeconomic variables. More recent literature also makes use of a doubly stochastic assumption which in essence holds that given a certain path of covariates the default probabilities of two similar firms is independent. We explore empirical evidence which points to correlated defaults conditional on various explanatory covariates. Given the strong similarities in underlying firm structure and relationship to macro-economic environment, it can be hypothesized that there exist correlations in default behavior among similar firms.
by Sreeram Thirukkonda.
S.M.
Marianetti, Chris 1975. "Electronic correlations in Lix̳ CoO₂". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/30120.
Testo completoIn title on t.p., double-underscored "x" appears as subscript.
Includes bibliographical references (p. 120-123).
The purpose of this thesis is further the understanding of the electronic properties of LixCoO2 using density functional theory (DFT) and the dynamical mean-field theory (DMFT). Three main problems are addressed. First, the influence of hybridization among the eg and oxygen orbitals is studied using DFT and a modified Hubbard model which is solved within DMFT. It has long been known that doping holes into the t2g bands are accompanied by a rehybridization which causes electron density to be added to the eg states and hole density to the oxygen states. This so-called rehybridization mechanism has been demonstrated to be a competition between the hybridization, which prefers to occupy the eg orbitals, and the Co on-site coulomb repulsion, which prefers to have the eg orbitals empty to avoid the strong coulomb interaction. It is also shown that eg-oxygen hybridization effectively screens the low energy t2g excitations, which has implications for the low energy Hamiltonian corresponding to hydrated Nal/3CoO2. Second, the hereto anomalous first-order metal-insulator transition in LixCoO2 (0.75 < x < 0.95) is identified as a Mott transition of impurity states. DFT supercell calculations indicate that for dilute Li vacancy concentrations (ie x > 0.95), the vacancy potential binds its hole and forms an impurity state which leads to a Mott insulator. We argue that the first-order transition is due to a decomposition of the impurity band, and is perhaps the only known example of a first-order Mott transition in a doped semiconductor. Third, LiCoO2 possesses a high energy photoemission satellite which hereto could not be predicted by any first-principles method. LDA+DMFT solved within multi-band iterated perturbation theory successfully predicts the satellite.
by Chris A. Marianetti.
Ph.D.
Ainsley, Anne Elizabeth. "Interplot correlations in variety trials". Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/13828.
Testo completoCheong, Pak Leng. "Genotype-Phenotype Correlations in Porphyria". Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/13647.
Testo completoIbnouhsein, Mohamed Issam. "Quantum correlations and causal structures". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112426/document.
Testo completoRecent works in foundations of quantum (field) theory and relativistic quantum information try to better grasp the interplay between the structure of quantum correlations and the constraints imposed by causality on physical operations. Chapter 1 is dedicated to the study of the conceptual implications of quantum nonlocality, a concept that subsumes that of entanglement in a certain way. We detail the recent information-theoretic approaches to understanding the structure of nonlocal correlations, and the issues the latter raise concerning the ability of local observers to isolate a system from its environment. Chapter 2 reviews in what sense imposing Poincaré invariance affects entanglement detection and quantification procedures. This invariance ultimately forces a description of all quantum systems within the framework of quantum field theory, which leads to the impossibility of localized finite-energy states and to the divergence of all entanglement measures for local observers. We provide a solution to these two problems by showing that there exists a generic equivalence between a finite spatial resolution of the measurement apparatus and the exclusion of high-energy degrees of freedom from the definition of the observed system. This equivalence allows for an epistemic interpretation of the standard quantum formalism describing nonrelativistic localized systems and their correlations, hence a clarification of the origin of the finite measures of entanglement between such systems. Chapter 3 presents a recent theoretical framework that predicts the existence of correlations with indefinite causal order. In analogy to the information-theoretic approaches to nonlocal correlations, we introduce some principles that constrain the structure of such correlations, which is a first step toward a clear understanding of their physical origin
Rabenseifner, Adrian. "Oblivious transfer from non-local correlations". Zurich : ETH, Swiss Federal Institute of Technology Zurich, Department of Computer Science, Group of Quantum Information, 2009. http://e-collection.ethbib.ethz.ch/show?type=dipl&nr=446.
Testo completoGuerini, de Souza Leonardo. "Simulating quantum measurements and quantum correlations". Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/482108.
Testo completoEsta tese de doutorado é centrada no problema de simulação de medições quânticas, ou seja, em decidir se uma dada medição pode ser simulada quando temos acesso a apenas um subconjunto restrito de medições. Apresentamos um framework operacional para esse problema, baseado em manipulações clássicas sobre o conjunto de simuladores. Casos particulares de interesse são estudados em detalhe, nos quais o conjunto de simuladores é dado por medições projetivas, medições de um número fixo de outcomes, e conjuntos arbitrários de cardinalidade fixada. Em cada uma dessas situações, derivamos condições necessárias ou suficientes para simulabilidade, e uma caracterização completa em termos de programação semidefinida em alguns casos específicos. Como comensurabilidade é um caso particular de simulabilidade, apresentamos também uma generalização natural para esse conceito. Além de decidir se uma dada medição é simulável ou não, também exploramos a questão de quais são as medições mais robustas contra simulabilidade. Apresentamos então uma estratégia para aproximar o conjunto das medições quânticas baseada em uma relaxação da condição de positividade. Isso nos permite identificar a medição mais robusta contra simulabilidade projetiva em dimensão 2, assim como os conjuntos de N medições mais incompatíveis, para N = 1, . . . , 5, que notavelmente se revelam ser projetivas em todos esses casos. Aplicando nossos resultados de simulabilidade no contexto de Einstein-Podolsky-Rosen steering e não-localidade de Bell, somos capazes de construir modelos locais melhores e mais gerais. Partindo de modelos para um número finito de medições, obtemos o primeiro método geral para construção de modelos locais para famílias arbitrárias de estados quânticos. De forma similar, nosso estudo de simulabilidade projetiva fornece uma estratégia para estender modelos locais para medições projetivas a medições arbitrárias, culminando no mais eficiente modelo local para estados de Werner de dois qubits e medições quaisquer
Aquesta tesi doctoral se centra en el problema de la simulació de mesures quàntiques, és a dir, en decidir si es pot simular una determinada mesura quan només tenim accés a un subconjunt restringit de mesures diferents. Presentem un marc operacional per a aquest problema, basat en manipulacions clàssiques sobre el conjunt de simuladors. Casos particulars d’interès son estudiat en detall, on el conjunt de simuladors està donat per mesures projectius, mesures d’un nombre fix de resultats i conjunts arbitraris de cardinalitat fixa. En cadascuna d’aquestes situacions, derivem condicions necessaris o suficients per a la simulació, i una caracterització completa en termes de programació semi-definida en alguns casos específics. Com la mensurabilitat conjunta és un cas particular de simulació, presentem també una generalització natural per a aquest concepte. A més de decidir si un mesura és simulable o no, també exploram la qüestió de quines son las mesures més robustes contra la simulabilitat. A continuació, presentem una estratègia per aproximar el conjunt de mesures quàntiques basat en una relaxació de la condició de positivitat. Això permet la identificació de la mesura més robusta envers la simulació projectiva en dimensió 2, així com els conjunts més incompatibles de N mesures, per N = 1, . . . , 5, que notablement resulten ser projectivas en tots aquests casos. Aplicant els nostres resultats de simulació en el context d’Einstein-Podolsky-Rosen steering i no-localitat de Bell, som capaços de construir models locals millors i més generals. A partir de models per a un nombre finit de mesures, obtenim el primer mètode general per a la construcció de models locals per a famílies arbitràries d’estats quàntics. De la mateixa manera, el nostre estudi de la simulació projectiva proporciona una estratégia per ampliar models locals per a mesures projectivas a mesures arbitraris, culminant en el model local més eficient per als estats de Werner de dos qubits i mesures generals
Kidun, Oleg. "Investigation of electronic correlations in nanostructures". [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=972491562.
Testo completoHogan, Patrick. "Correlations in geometrically frustrated spin systems". Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491535.
Testo completoGuimarães, Dias Ricardo Assis. "Anomalous correlations in low dimensional metals". Thesis, University of Cambridge, 1996. https://www.repository.cam.ac.uk/handle/1810/251598.
Testo completoBurke, Georgina. "Genotype - phenotype correlations in congenital myasthenia". Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437178.
Testo completoNunnenkamp, Andreas. "Strong correlations in ultracold atomic gases". Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:6e09e9d3-f5cd-4580-a667-6599203162e2.
Testo completoCollins, Jeremy Charles. "Grammaticalization and Greenberg's word order correlations". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B50534130.
Testo completopublished_or_final_version
Linguistics
Master
Master of Philosophy
Lyamzin, Dmitry. "Correlations in populations of sensory neurons". Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-176398.
Testo completoLang, Guillaume. "Correlations in low-dimensional quantum gases". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY076/document.
Testo completoUltracold atom gases are a versatile platform to simulate condensed matter physics phenomena, as virtually any parameter is experimentally tunable with a high accuracy.In particular, highly anisotropic traps allow the realization of low-dimensional systems, where the role of quantum fluctuations is enhanced. I investigate the paradigmatic model of a one-dimensional Bose gas with contact interactions, a.k.a the Lieb-Liniger model, using powerful analytical tools such as Bethe Ansatz, Conformal Field Theory and the Tomonaga-Luttinger liquid formalism, as well as the Bose-Fermi mapping.These exact and approximate methods allow me to investigate with high accuracy its Ground-State energy and thermodynamics, excitation spectra and correlation functions, from the k-body local correlations to the momentum distribution and the dynamical structure factor. These quantities yield useful informations on the coherence and superfluidity of a gas. In particular, I study the drag force exerted by a gaussian laser beam stirred into the gas in linear response theory.Then, releasing a transverse trapping, I study the appearance of a multimode structure and the dimensional crossover. All along, the effect of a harmonic trap in the longitudinal direction is studied within the Local Density Approximation
FIELDS, PATRICK-PIERRE. "Correlations radio-serologiques des polyarthrites rhumatoides". Aix-Marseille 2, 1988. http://www.theses.fr/1988AIX20491.
Testo completoSchneider, William. "Strong Correlations in Ultracold Fermi Gases". The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316447449.
Testo completoBrézin, Antoine P. "Glaucome chronique : genetique et correlations cliniques". Paris 7, 2001. http://www.theses.fr/2001PA077064.
Testo completoZhang, Zhihong. "Feature selection from higher order correlations". Thesis, University of York, 2012. http://etheses.whiterose.ac.uk/3340/.
Testo completoBennet, Adam Joseph. "Optical Experiments on Shared Quantum Correlations". Thesis, Griffith University, 2015. http://hdl.handle.net/10072/365930.
Testo completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Biomolecular and Physical Sciences
Science, Environment, Engineering and Technology
Full Text
Wolstenhulme, Richard. "Three-point phase correlations in cosmology". Thesis, University of Cambridge, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.762062.
Testo completoChrzanowski, Helen Mary. "Extracting quantum correlations from gaussian states". Phd thesis, Canberra, ACT : The Australian National University, 2014. http://hdl.handle.net/1885/14511.
Testo completoRICCARDI, ALBERTO. "UNCERTAINTY RELATIONS, QUANTUM CORRELATIONS AND APPLICATIONS". Doctoral thesis, Università degli studi di Pavia, 2020. http://hdl.handle.net/11571/1317091.
Testo completoAbedinpour, Harzand Saeed. "Correlations in low-dimensional electron liquids". Doctoral thesis, Scuola Normale Superiore, 2007. http://hdl.handle.net/11384/85852.
Testo completoAVRIL, GEORGES-ANTOINE. "Plaques d'endarteriectomie carotidienne : correlations anatomo-cliniques". Nice, 1989. http://www.theses.fr/1989NICE6022.
Testo completoThomsen, Laura Kathrine Wehde, e n/a. "Using Quantum Feedback to Control Nonclassical Correlations in Light and Atoms". Griffith University. School of Science, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040406.124012.
Testo completoThomsen, Laura Kathrine Wehde. "Using Quantum Feedback to Control Nonclassical Correlations in Light and Atoms". Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367297.
Testo completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Science
Full Text
Thongchua, Chalita, e Wenjin Yang. "Correlations between Requirement Attributes and Process Attributes : Identifying and quantifying the correlations in a rapid software development process". Thesis, Blekinge Tekniska Högskola, Avdelningen för programvarusystem, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2206.
Testo completoNilsson, Johanna. "CORRELATIONS BETWEEN PHYSICOCHEMICAL PROPERTIES IN MATERIALS COMPRISING MICROFIBRILLATED CELLULOSE : CORRELATIONS BETWEEN PHYSICOCHEMICAL PROPERTIES IN MATERIALS COMPRISING MICROFIBRILLATED CELLULOSE". Thesis, Umeå universitet, Kemiska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-185526.
Testo completoSchütz, Florian. "Aspects of strong correlations in low dimensions". [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976728982.
Testo completo