Дисертації з теми "Ensemble FRET"
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Sharma, Shruti. "Unfolding and compaction in chaperonin-assisted protein folding followed by single molecule and ensemble FRET." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-76225.
Повний текст джерелаStenström, Harald. "Free ensemble improvisation /." Göteborg : Faculty of Fine, Applied and Performing Arts, Academy of Music and Drama, University of Gothenburg, 2009. http://hdl.handle.net/2077/20293.
Повний текст джерелаStubblefield, Cedrick L. "Extracting value from ensembles for cloud-free forecasting." Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/10796.
Повний текст джерелаWatson, Samuel Stewart 1986. "Conformal loop ensembles and the Gaussian free field." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/97319.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 173-178).
The study of two-dimensional statistical physics models leads naturally to the analysis of various conformally invariant mathematical objects, such as the Gaussian free field, the Schramm-Loewner evolution, and the conformal loop ensemble. Just as Brownian motion is a scaling limit of discrete random walks, these objects serve as universal scaling limits of functions or paths associated with the underlying discrete models. We establish a new convergence result for percolation, a well-studied discrete model. We also study random sets of points surrounded by exceptional numbers of conformal loop ensemble loops and establish the existence of a random generalized function describing the nesting of the conformal loop ensemble. Using this framework, we study the relationship between Gaussian free field extrema and nesting extrema of the ensemble of Gaussian free field level loops. Finally, we describe a coupling between the set of all Gaussian free field level loops and a conformal loop ensemble growth process introduced by Werner and Wu. We prove that the dynamics are determined by the conformal loop ensemble in this coupling, and we use this result to construct a conformally invariant metric space.
by Samuel Stewart Watson.
Ph. D.
Li, Rui. "OVERCOMING INITIAL HURDLES: STRATEGIES FOR DEVELOPING A UNIVERSITY FREE IMPROVISATION ENSEMBLE." UKnowledge, 2015. http://uknowledge.uky.edu/music_etds/52.
Повний текст джерелаEriksson, Jesper. "My Improvisation Practice : the act of improvising in individual instrumental practice, collaboration projects and performance." Thesis, Kungl. Musikhögskolan, Institutionen för klassisk musik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kmh:diva-1654.
Повний текст джерелаSjälvständiga arbete, Master, 40 hp.
Program examenskonsert:
ImprovisationKvintett
Jesper Eriksson saxofon, Linnea Andreassen röst, Maiju Kopra röst, Viktor Rydén röst, Amanda Larsson röst.
Jesper ErikssonKvartett (2014), uruppförande
Alexander Rydberg violin, Jesper Eriksson saxofon, Emma Augustsson cello, Anton Svanberg tuba.
ImprovisationTrio
Jesper Eriksson saxofon, Jaan Krivel röst och klarinett, Kristoffer Linder slagverk
Extranummer: Friimprovisationsorkester
Jesper Eriksson saxofon, Alexander Rydberg violin, Emma Augustsson cello, Anton Svanberg tuba, Linnea Andreassen röst, Maiju Kopra röst, Viktor Rydén röst, Amanda Larsson röst, Jaan Krivel röst och klarinett, Kristoffer Linder slagverk, Bernhard Greter piano.
Martínez, Monge Álvaro. "Free energy and information-content measurements in thermodynamic and molecular ensembles." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667026.
Повний текст джерелаEn esta tesis hemos abordado cuestiones fundamentales de la física estadística. En particular, hemos estudiado el problema de la equivalencia entre colectivos estadísticos, la conversión de energía a información y el estudio de las energías específicas de unión de iones metálicos a sustratos de RNA. Esta tesis doctoral se ha llevado a cabo empleando dos de los instrumentos de molécula individual más conocidos, las pinzas ópticas y las pinzas magnéticas. Ambas son técnicas que permiten la aplicación controlada de fuerzas mecánicas a los extremos de una molécula individual. El poder aplicar fuerzas a sistemas moleculares permite llevar a cabo una profunda caracterización de las propiedades físicas de los llamados sistemas pequeños. Las dimensiones de estos sistemas abarcan desde unos pocos nanómetros —una millonésima parte del metro— hasta varios cientos de nanómetros. Además, los sistemas pequeños están lejos del llamado límite termodinámico y están dominados por las fluctuaciones térmicas del entorno. Por lo tanto, debido a estas peculiaridades, el estudio de sistemas pequeños mediante los instrumentos de molécula individual permite impulsar y extender los horizontes de la física de no equilibrio.
Westerlund, Annie M. "Computational Study of Calmodulin’s Ca2+-dependent Conformational Ensembles." Licentiate thesis, KTH, Biofysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-234888.
Повний текст джерелаQC 20180912
Nungesser, Ernesto [Verfasser]. "The future of some Bianchi A spacetimes with an ensemble of free falling particles / Ernesto Nungesser." Berlin : Freie Universität Berlin, 2012. http://d-nb.info/1027308546/34.
Повний текст джерелаHartz, Barry C. "Cultivating Individual Musicianship and Ensemble Performance Through Notation-Free Learning in Three High School Band Programs." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1435244359.
Повний текст джерелаPiedra, Olman E. "Creative Musical Improvisation in the Development and Formation of NEXUS Percussion Ensemble." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1387545761.
Повний текст джерелаLupu, Titus. "Ensembles poissoniens de boucles markoviennes." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112066/document.
Повний текст джерелаIn this thesis I study an infinite measure on loops naturally associated to a wide range of Markovian processes and the Poisson point processes of intensity proportional to this measure (intensity parameter alpha>0). This Poissson point processes are called Poisson ensembles of Markov loops or loop soups. The measure on loops is covariant with some transformation on Markovian processes, for instance the change of time. In the setting of Brownian loop soups inside a proper open simply connected domain of C it was shown that the outer boundaries of outermost clusters of loops are, for alpha1/2, Conformal Loop Ensembles CLE(kappa), kappa in (8/3,4]. Besides, it was shown for a wide range of symmetric Markovian processes that for alpha=1/2 the occupation field of a loop soup (the sum of times spent by loops over points) is the square of the Gaussian free field. First I studied the loop soups associated to one-dimensional diffusions, and particularly the occupation field and its zeroes that delimit in this case the clusters of loops. Then I studied the loop soups on discrete graphs and metric graphs (edges replaced by continuous lines). On a metric graph on one hand the loops have a non-trivial geometry and on the other hand one has the same property as in the setting of one-dimensional diffusions that the zeroes of the occupation field delimit the clusters of loops. By combing metric graphs and the isomorphism with the Gaussian free field I have shown that alpha=1/2 is the critical parameter for random walk loop soup percolation on the discrete half-plane Z*N (existence or not of an infinite cluster of loops) and that for alpha<= 1/2 the scaling limit of outer boundaries of outermost clusters on Z*N is a CLE(kappa) on the continuum half plane
Brooks, Julian. "Being sound : FLOSS, flow and event in the composition and ensemble performance of free open computer music." Thesis, University of Huddersfield, 2016. http://eprints.hud.ac.uk/id/eprint/31370/.
Повний текст джерелаSalquebre, Quentin. "Développement d'un modèle de prédimensionnement d'un ensemble alternateur - machine Stirling à pistons libres." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT015/document.
Повний текст джерелаThough the Stirling engine was invented two centuries ago, it has never really grown to a fully marketable level. The current energy context has renewed the interest in this engine. Their ability to work with any external source of heat allow them to be associated with renewable energy such as solar energy. Beyond its ecological benefits, the invention of the free piston Stirling engine by W. Beale at the end of the 1960’s further increased the interest in Stirling engines. This novel structure allows the engine to operate without mechanical interface between pistons, which are driven entirely by the gas or other spring forces. In such engines, the pistons kinematics and the system thermodynamics are intimately coupled, thus increasing the complexity of the complete system computer modelling.This PhD presents an innovative technique to model a free piston Stirling engine that takes into account the coupling between the system thermodynamics and the mechanical response of the free pistons. This technique has been named LHA5V standing for Linear Harmonic Analysis 5 Volumes. It consists in splitting the engine in five open sub-systems: the compression and expansion spaces, the heater, the cooler and the regenerator. We hypothesize that the state variables are periodic, and the model then determines the variations of their mean, amplitude and phase values in order to satisfy the mass and energy conservation equations. This PhD also presents a model for a linear electric alternator, which can be coupled to the power piston. This electrical model is based on an analytical calculation of the thrust between the stator and the magnets. Magnetic flux and induction in the iron are determined by a carefully tuned reluctance network.Both thermal and electrical models have been designed to optimize both computing time and accuracy. The models generated have systematically been compared to experimental data or finite element analysis, with satisfactory results
Cunha, João Victor de Souza. "Aplicação de Monte Carlo para a geração de ensembles e análise termodinâmica da interação biomolecular." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-25112016-143220/.
Повний текст джерелаThe molecular interactions, especially the ones with a non-covalent nature, are key processes in general aspects of cellular and molecular biology, including cellular communication and velocity and specificity of enzymatic reactions. So, there is a strong need for studies and development of methods for the calculation of the affinity on interaction processes, since these have a wide range of applications like rational drug design. The free energy of binding is the most important measure among the affinity measurements. It can be calculated by quick computational means, but lacking on strong theoretical basis or by complex calculations using molecular dynamics, where one can compute accurate results but at the price of an increased computer power. The aim of this project is to evaluate a computationally inexpensive model which can improve the results from molecular docking simulations. For this end, the Monte Carlo method is implemented to sample different ligand configurations inside the macromolecular binding site. The evaluation of this methodology showed that is possible to calculate entropy and enthalpy, along analyzing the interactive capacity between receptor-ligands complexes in a satisfactory way for the bacteriophage T4.
Viveca, Lindahl. "Optimizing sampling of important events in complex biomolecular systems." Doctoral thesis, KTH, Fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217837.
Повний текст джерелаQC 20171117
Nicolas, Adrien. "Optical quantum memories with cold atomic ensembles : a free space implementation for multimode storage, or a nanofiber-based one for high collection efficiency." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066494/document.
Повний текст джерелаWe present an experimental study of two optical quantum memory systems based on electromagnetically induced transparency (EIT) in cold cesium atoms.We explain the relevance of quantum memories for the development of large-scale quantum networks, we give a comprehensive theory of the EIT phenomenon and underline the role of relevant parameters regarding the implementation of quantum memories.The first system under study is prepared in a free-space magneto-optical trap. The main result of this thesis is the demonstration of the spatial multimode capability of this system at the quantum level. For this, we used Laguerre-Gaussian (LG) light beams, i.e. beams possessing a non-zero value of orbital angular momentum (OAM). In a first step, we showed that the orbital angular momentum of stored light pulses is preserved by the memory, deep in the single photon regime. In a second step, we encoded information in the orbital angular momentum state of a weak light pulse and defined a qubit using two LG beams of opposite helicities. We developed an original setup for the measurement of this OAM qubit and used it to characterize the action of the memory during the storage of such a light pulse. Our results show that the memory performs the quantum storage of such a qubit.The second system under study, also a cloud of cold atoms, has the specificity that the atoms are trapped optically in the vicinity of a nano-waveguide. This innovative design ensures a higher light-matter interaction and facilitates the interfacing of photons into and out of the memory. We describe the building of this setup and the first steps towards quantum memory implementations
Wu, Hao. "Autour les relations entre SLE, CLE, champ libre Gaussien, et les conséquences." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00856599.
Повний текст джерелаÅberg, K. Magnus. "Variance Reduction in Analytical Chemistry : New Numerical Methods in Chemometrics and Molecular Simulation." Doctoral thesis, Stockholm University, Department of Analytical Chemistry, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-283.
Повний текст джерелаThis thesis is based on five papers addressing variance reduction in different ways. The papers have in common that they all present new numerical methods.
Paper I investigates quantitative structure-retention relationships from an image processing perspective, using an artificial neural network to preprocess three-dimensional structural descriptions of the studied steroid molecules.
Paper II presents a new method for computing free energies. Free energy is the quantity that determines chemical equilibria and partition coefficients. The proposed method may be used for estimating, e.g., chromatographic retention without performing experiments.
Two papers (III and IV) deal with correcting deviations from bilinearity by so-called peak alignment. Bilinearity is a theoretical assumption about the distribution of instrumental data that is often violated by measured data. Deviations from bilinearity lead to increased variance, both in the data and in inferences from the data, unless invariance to the deviations is built into the model, e.g., by the use of the method proposed in paper III and extended in paper IV.
Paper V addresses a generic problem in classification; namely, how to measure the goodness of different data representations, so that the best classifier may be constructed.
Variance reduction is one of the pillars on which analytical chemistry rests. This thesis considers two aspects on variance reduction: before and after experiments are performed. Before experimenting, theoretical predictions of experimental outcomes may be used to direct which experiments to perform, and how to perform them (papers I and II). After experiments are performed, the variance of inferences from the measured data are affected by the method of data analysis (papers III-V).
Reynolds, Ryan Michael. "Moving targets: Political theatre in a post-political age." Thesis, University of Canterbury. Theatre and Film Studies, 2006. http://hdl.handle.net/10092/898.
Повний текст джерелаLi, Qiang. "Direct and Large-Eddy Simulations of Turbulent Boundary Layers with Heat Transfer." Doctoral thesis, KTH, Mekanik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41156.
Повний текст джерелаAru, Juhan. "Géométrie du champ libre Gaussien en relation avec les processus SLE et la formule KPZ." Thesis, Lyon, École normale supérieure, 2015. http://www.theses.fr/2015ENSL1007/document.
Повний текст джерелаIn this thesis we study the geometry of the Gaussian free field (GFF). After a gentle general introduction, we describe what we call the Hodge decomposition of the white noise – a way to represent the white noise vector field as a sum of a gradient and a rotation of independent GFFs. This decomposition gives rise to the Donsker invariance principle for the GFF.Next, we revisit from a slightly different angle the theory of so-called local sets of the GFF, introduced by Schramm and Sheffield. These random sets allow one to study the geometry of the GFF in a Markovian way. We also go a step further in describing the behaviour of the field near the boundary of possibly several local sets. The first chapter ends with a study of boundary oscillations of the GFF.The GFF is only a generalized function, yet it comes out that one can still make sense of it as a „random landscape“. In particular, Schramm and Sheffield gave meaning to the level lines of the GFF in terms of a coupling with SLE_4 process. In chapter 2 we study this coupling and describe the existent proofs and a non-proof of measurability of the SLE_4 process in this coupling. The rest of this chapter contains one of the most technical parts of the thesis – we obtain fine estimates on the winding of the SLE curves, conditioned to pass closely by a fixed point.This technical work is put in use in chapter 3, where we study the so called KPZ relation. In this context, the KPZ formula relates fractal dimensions of sets under the Euclidean geometry and under the „quantum geometry“ given by the exponential of the GFF. So far the KPZ formula was derived for planar sets independent of the quantum geometry. Here, we determine the KPZ formulas for sets that are naturally coupled with the quantum geometry – for the flow and level lines of the GFF. The family of KPZ formulas obtained resemble but still differ from the KPZ formula for independent sets
Hamy, Anne-Sophie. "Identification of Factors Predicting Sensitivity or Resistance to Neoadjuvant Chemotherapy in Breast Cancer Neoadjuvant treatment : the future of patients with breast cancer Neoadjuvant treatment for intermediate/high-risk HER2-positive and triple-negative breast cancers: no longer an “option” but an ethical obligation Long-term outcome of the REMAGUS 02 trial, a multicenter randomised phase II trial in locally advanced breast cancer patients treated with neoadjuvant chemotherapy with or without celecoxib or trastuzumab according to HER2 status BIRC5 (survivin) : a pejorative prognostic marker in stage II/III breast cancer with no response to neoadjuvant chemotherapy Beyond Axillary Lymph Node Metastasis, BMI and Menopausal Status Are Prognostic Determinants for Triple-Negative Breast Cancer Treated by Neoadjuvant Chemotherapy Pathological complete response and prognosis after neoadjuvant chemotherapy for HER2-positive breast cancers before and after trastuzumab era: results from a real-life cohort The presence of an in situ component on pre-treatment biopsy is not associated with response to neoadjuvant chemotherapy for breast cancer Chemosensitivity, tumor infiltrating lymphocytes (TILs), and survival of postpartum PABC patients treated by neoadjuvant chemotherapy Lymphovascular invasion after neoadjuvant chemotherapy is strongly associated with poor prognosis in breast carcinoma New insight for pharmacogenomics studies from the transcriptional analysis of two large-scale cancer cell line panels Biological network-driven gene selection identifies a stromal immune module as a key determinant of triple-negative breast carcinoma prognosis A Stromal Immune Module Correlated with the Response to Neoadjuvant Chemotherapy, Prognosis and Lymphocyte Infiltration in HER2-Positive Breast Carcinoma Is Inversely Correlated with Hormonal Pathways Stromal lymphocyte infiltration after neoadjuvant chemotherapy is associated with aggressive residual disease and lower disease-free survival in HER2-positive breast cancer Interaction between molecular subtypes, stromal immune infiltration before and after treatment in breast cancer patients treated with neoadjuvant chemotherapy COX2/PTGS2 Expression Is Predictive of Response to Neoadjuvant Celecoxib in HER2-negative Breast Cancer Patients Celecoxib With Neoadjuvant Chemotherapy for Breast Cancer Might Worsen Outcomes Differentially by COX-2 Expression and ER Status: Exploratory Analysis of the REMAGUS02 Trial Comedications influence immune infiltration and pathological response to neoadjuvant chemotherapy in breast cancer." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS129.
Повний текст джерелаNeoadjuvant chemotherapy (NAC i.e. chemotherapy before surgery) is increasingly being used for aggressive or locally advanced breast cancer (BCs). Beyond clinical benefits, it represents an opportunity to monitor in vivo sensitivity to treatment. Based on the analysis of datasets of BCs patients treated with NAC, we aimed at identifying mechanisms associated with resistance or sensitivity to treatment.In the first part, we evaluated biological, clinical, pathological and transcriptomic patterns. We demonstrated that unexplored pathological features such as post-NAC lymphovascular invasion may carried an important prognostic information.In a second part, we analyzed impact of imune infiltration in BC and we described extensively the changes of tumor infiltrating lymphocytes (TILs) between pre and post-NAC samples. We showed that the prognostic impact of TILs was different before and after NAC, and was opposite in TNBC and HER2-positive BCs. Finally, we investigated the impact of comedications use during NAC. We found both positive effects - while enhancing immune infiltration and response to treatment - and negative effects with deleterisous oncologic outcomes in specific patients subgroups. In conclusion, the neoadjuvant setting represents a platform to both generate and potentially validate research hypotheses aiming at increasing the efficacy of treatment. The public release of real-life datasets of BC patients treated with NAC would represent a major resource to accelerate BC research
Mohammadridha, Taghreed. "Automatic Glycemia Regulation of Type I Diabetes." Thesis, Ecole centrale de Nantes, 2017. http://www.theses.fr/2017ECDN0008.
Повний текст джерелаThis thesis investigates closed-loop control for glycemia regulation of Type1 Diabetes Mellitus (T1DM). Two main controller categories are designed: non-model-based and model-based. To test their efficiency, both types are tested in silico on two T1DM simulators. The first is a long-term model that is derived from clinical data of T1DM subjects and the second is the Uva/Padova simulator. Firstly, Model-free Control (MFC) is designed: a variable reference intelligent Proportional (iP) control and a constant reference intelligent Proportional-Integral-Derivative (iPID). Better overall performance is yielded with iPID over iP and over a classic PID. Secondly, a positive Sliding Mode Control SMC is designed for the first time for glycemia regulation. The model-based controller is chosen for glycemia regulation due to its well-known robustness properties. More importantly, our main contribution is that SMC is designed to be positive everywhere in the positively invariant set for the plasma insulin subsystem. Finally, a positive state feedback controller is designed for the first time to regulate glycemia. The largest Positively Invariant Set (PIS) is found. Not only control positivity is respected but rather a tight glycemic control is achieved. When the system initial condition belongs to the PIS, hypoglycemia is prevented, otherwise future hypoglycemia is predicted for any initial condition outside the PIS
Pouilly-Cathelain, Maxime. "Synthèse de correcteurs s’adaptant à des critères multiples de haut niveau par la commande prédictive et les réseaux de neurones." Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG019.
Повний текст джерелаThis PhD thesis deals with the control of nonlinear systems subject to nondifferentiable or nonconvex constraints. The objective is to design a control law considering any type of constraints that can be online evaluated.To achieve this goal, model predictive control has been used in addition to barrier functions included in the cost function. A gradient-free optimization algorithm has been used to solve this optimization problem. Besides, a cost function formulation has been proposed to ensure stability and robustness against disturbances for linear systems. The proof of stability is based on invariant sets and the Lyapunov theory.In the case of nonlinear systems, dynamic neural networks have been used as a predictor for model predictive control. Machine learning algorithms and the nonlinear observers required for the use of neural networks have been studied. Finally, our study has focused on improving neural network prediction in the presence of disturbances.The synthesis method presented in this work has been applied to obstacle avoidance by an autonomous vehicle
Amrane, Amazigh. "Posets série-parallèles transfinis : automates, logiques et théories équationnelles." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR102.
Повний текст джерелаWe study in this thesis structures extending the classical notion of word. They are built from a partially ordered set (poset) verifying the following properties : — they do not contain 4 distinct elements x, y, z, t whose relative order is exactly x < y, z < y, z < t (posets called N-free) ; — their chains are countable and scattered linear orderings ; — their antichains are finite ; and each element is labeled by a letter of a finite alphabet. Equivalently, the class of posets which we consider is the smallest one built from the empty poset and the singleton, and being closed under sequential and parallel products, and ω product and its backward ordering −ω (series-parallel posets). It is a generalization of both of finite series-parallel labeled posets, by adding infinity, and transfinite words, by weakening the total ordering of the elements to a partial ordering. In computer science, series-parallel posets find their interest in modeling concurrent processes based on fork/join primitives, and transfinite words in the study of recursion. The rational languages of these labeled posets are defined from expressions and equivalent automata introduced by Bedon and Rispal, which generalize thecase of transfinite words (Bruyère and Carton) and the one of finite posets (Lodaya and Weil). In this thesis we study such structures from the logic point of view. In particular, we generalize the Büchi-Elgot-Trakhtenbrot theorem, establishing in the case of finite words the correspondence between the class of rational languages and the one of languages definable in monadic second order logic (MSO). The implemented logic is an extension of MSO by Presburger arithmetic. We focus on some varieties of posets algebras too. We show that the algebra whose universe is the class of transfinite series-parallel posets and whose operations are the sequential and parallel products and the ω and −ω products (resp. powers) is free in the corresponding variety V (resp. V 0). We deduce the freeness of the same algebra without parallel or −ω product. Finally, we showthat the equational theory of V 0 is decidable. These results are, in particular, generalizations of similar results of Bloom and Choffrut on the variety of algebras of words whose length are less than ω!, of Choffrut and Ésik on the variety of algebras of N-free posets whose antichains are finite and whose chains are less than ω! and those of Bloom and Ésik on the variety of algebras of words indexed by countable and scattered linear orderings
MEDEIROS, Rex Antonio da Costa. "Zero-Error capacity of quantum channels." Universidade Federal de Campina Grande, 2008. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1320.
Повний текст джерелаMade available in DSpace on 2018-08-01T21:11:37Z (GMT). No. of bitstreams: 1 REX ANTONIO DA COSTA MEDEIROS - TESE PPGEE 2008..pdf: 1089371 bytes, checksum: ea0c95501b938e0d466779a06faaa4f6 (MD5) Previous issue date: 2008-05-09
Nesta tese, a capacidade erro-zero de canais discretos sem memória é generalizada para canais quânticos. Uma nova capacidade para a transmissão de informação clássica através de canais quânticos é proposta. A capacidade erro-zero de canais quânticos (CEZQ) é definida como sendo a máxima quantidade de informação por uso do canal que pode ser enviada através de um canal quântico ruidoso, considerando uma probabilidade de erro igual a zero. O protocolo de comunicação restringe palavras-código a produtos tensoriais de estados quânticos de entrada, enquanto que medições coletivas entre várias saídas do canal são permitidas. Portanto, o protocolo empregado é similar ao protocolo de Holevo-Schumacher-Westmoreland. O problema de encontrar a CEZQ é reformulado usando elementos da teoria de grafos. Esta definição equivalente é usada para demonstrar propriedades de famílias de estados quânticos e medições que atingem a CEZQ. É mostrado que a capacidade de um canal quântico num espaço de Hilbert de dimensão d pode sempre ser alcançada usando famílias compostas de, no máximo,d estados puros. Com relação às medições, demonstra-se que medições coletivas de von Neumann são necessárias e suficientes para alcançar a capacidade. É discutido se a CEZQ é uma generalização não trivial da capacidade erro-zero clássica. O termo não trivial refere-se a existência de canais quânticos para os quais a CEZQ só pode ser alcançada através de famílias de estados quânticos não-ortogonais e usando códigos de comprimento maior ou igual a dois. É investigada a CEZQ de alguns canais quânticos. É mostrado que o problema de calcular a CEZQ de canais clássicos-quânticos é puramente clássico. Em particular, é exibido um canal quântico para o qual conjectura-se que a CEZQ só pode ser alcançada usando uma família de estados quânticos não-ortogonais. Se a conjectura é verdadeira, é possível calcular o valor exato da capacidade e construir um código de bloco quântico que alcança a capacidade. Finalmente, é demonstrado que a CEZQ é limitada superiormente pela capacidade de Holevo-Schumacher-Westmoreland.
Sharma, Shruti [Verfasser]. "Unfolding and compaction in chaperonin-assisted protein folding followed by single molecule and ensemble FRET / Shruti Sharma." 2007. http://d-nb.info/987979825/34.
Повний текст джерелаSrinivasa, Ramya. "Flavivirus RNA replication: Probe development, structural dynamics, and role of zinc ions." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6085.
Повний текст джерелаMenezes, José. "Creative Process in Free Improvisation." Master's thesis, 2010. http://hdl.handle.net/10174/6051.
Повний текст джерелаGiovannelli, Edoardo. "Sampling methods and free energy estimators for computer simulations: development and applications." Doctoral thesis, 2018. http://hdl.handle.net/2158/1124398.
Повний текст джерелаBenedix, Alexander [Verfasser]. "Free energy prediction of biomolecular systems using ensembles of structures / von Alexander Benedix." 2009. http://d-nb.info/997942266/34.
Повний текст джерелаSwann, Ellen Therese. "Development and application of statistical and quantum mechanical methods for modelling molecular ensembles." Phd thesis, 2018. http://hdl.handle.net/1885/142784.
Повний текст джерелаMartins, João Ricardo Gonçalves. "Study of the Förster resonance energy transfer in ensembles of colloidal PbS quantum dots, emitting in the near-infrared spectral range." Master's thesis, 2020. http://hdl.handle.net/1822/73680.
Повний текст джерелаFörster resonance energy transfer (FRET) is a non-radiative energy transfer mechanism between two light-emitting systems, such as two quantum dots (QDots) or molecules. This mechanism involves an excited donor fluorophore (e.g., a QDot or a dye molecule) which transfers its energy of excitation to an acceptor (another QDot or molecule which is in resonance with the donor), via dipole-dipole coupling. FRET is the dominant type of energy transfer between emitters at a nanometre proximity. Other factors that influence the efficiency of this energy transfer mechanism include the spectral overlap of the donor emission spectrum and the acceptor absorption spectrum and the relative orientation of the dipole moment of both particles. In nature, for instance, FRET plays a dominant role in the energy transfer in photosynthetic apparatus of plants and bacteria. Some interesting applications of FRET can be found in photovoltaics, probing of molecular distances and molecular interactions, and storage and transfer of quantum information. The main goal of this master thesis lies in detecting the presence of the FRET mechanism when two different colloidal QDot samples of PbS (short for Lead Sulfide), with different QDot size, are linked together via surface chemistry. This chemical procedure activates carboxyl or phosphate groups, which promote the binding of primary amines of organic glutathione QDot shell molecules. In other words, it promotes a cross-linkage between the organic shells of two, or more, quantum dots at a distance at which FRET is present. Using PbS quantum dots, which emit in the near-infrared (NIR) region of the light spectrum, these experiments can be reported as one of the first attempts to find The FRET mechanism in a near-infrared system of QDots. Most previous reports of FRET mechanisms were concerned with QDots which emit in the visible range, such as CdTe and CdSe QDots. The NIR spectral range, for instance, promotes interesting applications in photonic crystals, where FRET can be enhanced by spontaneous emission inhibition, in photovoltaics, in order to greatly absorb infrared light, and in the production of near-infrared QDot lasers. In order to find evidences of the presence of the FRET mechanism, emission spectra and time-resolved measurements, using the time correlated single photon counting technique (TCSPC), of cross-linked colloidal PbS QDot solutions have been performed and will be shown in this master thesis. Along with the experimental results, a study of statistical moments of the PbS quantum dot photoluminescence kinetics will be presented in this thesis, which experimental kinetics were acquired with TCSPC. With this statistical analysis, it is possible to evaluate and compare various decay properties, such as the average decay time, the mean-squared value of the decay and the measure of asymmetry of the time-resolved distribution. In order to understand the obtained results, some donor decay models were developed and studied, alongside with other decay functions found in the literature. A theoretical description of the FRET mechanism will be presented in order to understand the proposed decay models.
A transferência ressonante de energia de Förster (em inglês, Förster resonance energy transfer, ou, simplesmente, FRET) é um mecanismo de transferência de energia não radiativo presente entre duas unidades fluorescentes, como dois pontos quânticos ou duas moléculas. Neste mecanismo, um dador excitado (por exemplo, um ponto quântico ou uma molécula) transfere a sua energia de excitação para um aceitador (outro ponto quântico ou molécula) com o qual se encontre em ressonância, por acoplamento dipolo-dipolo. O FRET é um mecanismo dominante entre emissores distanciados entre si a uma ordem dos nanómetros. Outros fatores dominantes que influenciam a eficiência deste mecanismo de transferência são a sobreposição do espetro de emissão do dador com o espetro de absorção do aceitador e a orientação relativa do momento dipolar de ambas as partículas. Este mecanismo tem também um papel fundamental em processos biológicos como a fotossíntese em plantas e bactérias. Algumas aplicações de FRET podem ser encontradas em sistemas fotovoltaicos, na análise de distâncias e interações moleculares, e no armazenamento de informação quântica. O objetivo principal desta tese de mestrado é a deteção do mecanismo de FRET numa mistura coloidal de duas amostras pontos quânticos de PbS (símbolo químico para Galena, ou sulfeto de chumbo) com diferentes tamanhos, que são unidas por processos de química de superfícies. Estes processos químicos promovem, neste caso específico, ligações cruzadas físicas entre dois, ou mais, pontos quânticos, a uma distância da ordem dos nanómetros, que promove a presença de FRET. A deteção de FRET em sistemas de pontos quânticos que emitem no espetro infravermelho próximo (isto é, com comprimentos de onda entre 0.7 1.4mm), como os pontos quânticos de PbS, não é amplamente encontrada na literatura, a qual foca na deteção de mecanismos de FRET em pontos quânticos que emitem no espetro visível, como pontos quânticos de CdTe ou CdSe. O espetro infravermelho próximo permite, como exemplo, aplicações em cristais fotónicos, aonde o mecanismo de FRET é predominante pela inibição da emissão radiativa espontânea, assim como a aplicação em lasers que emitem no infravermelho e absorção de luz no infravermelho em sistemas fotovoltaicos. De forma a detetar a presença de FRET nas amostras de pontos quânticos, foram medidos espetros de emissão e cinéticas fotoluminescentes, estas obtidas por técnicas de resolução temporal de fotoluminescência como TCSPC (em inglês, Time Correlated Single Photon Counting). Em conjunto com os resultados experimentais obtidos, é apresentado nesta tese o estudo estatístico das cinéticas fotoluminescentes das amostras de pontos quânticos PbS, cujas cinéticas foram obtidas pela técnica de TCSPC. A partir desta análise estatística, é possível de avaliar e comparar várias propriedades das cinéticas, tais como o tempo médio de decaimento, o erro quadrático médio e a medida da assimetria da cinética obtida. De forma a compreender os resultados obtidos, alguns modelos de decaimentos do dador foram desenvolvidos e estudados, em conjunto com outras funções de decaimento que são encontradas na literatura. De forma a sustentar os modelos teóricos de decaimento, é também apresentado um tratamento teórico do mecanismo de FRET.
Brown, Mark R. "An analysis of freedom in Jean-Paul Sartre's Critique of dialectical reason, Volume 1: theory of practical ensembles /." 1997.
Знайти повний текст джерелаReynolds, R. M. "Moving targets : political theatre in a post-political age : a thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy in the University of Canterbury /." 2006. http://library.canterbury.ac.nz/etd/adt-NZCU20060926.133947.
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