Dissertationen zum Thema „Two levels of mixing“
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Neal, Peter. „Epidemics with two levels of mixing“. Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394751.
Der volle Inhalt der QuelleRaimondo, Gianluca. „Particle mixing, two level systems and gauge theory“. Doctoral thesis, Universita degli studi di Salerno, 2012. http://hdl.handle.net/10556/1304.
Der volle Inhalt der QuelleIn this thesis I will discuss the theory of two level systems and the theory of the oscillating particles in quantum eld theory. In the rst chapter I will consider the time evolution of a two level system, a qubit, to show that it has inside a local in time gauge invariant evolution equation. I construct the covariant derivative operator and show that it is related to the free energy. The gauge invariance of the time evolution of the two level system is analogous to the phenomenon of birefringence.I also show that the two level systems present a Berry-like and an Anandan-Aharonov phase. Finally, I discuss entropy environment e ects and the distance in projective Hilbert space between two level states to show that the last one is properly related to the Aharonov - Anandan phase. In the second chapter I review the result obtained in QFT for particle mix- ing, analyzing the theoretical construction and the oscillation formula in the fermion case.I will emphasize the di erences between the quantum mechan- ics formulas and the QFT formulas.The unitary inequivalence between the avor and the mass eigenstates is also shown and the structure of the current for charged elds is nally discussed. I found a non - perturbative vacuum structure for the mixing particles that, among the other things, will lead to a non zero contribution to the value of the cosmological constant (chapter 3). Several links between rst and second chapter will arise from this thesis and will shed the light on the fact that it is possible to construct a generic two level quantum eld theory, that is an extension of the quantum mechanics bit theory in a quantum eld theory framework. [edited by author]
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An, Sunghyuck. „Theory of multiwave mixing in two- and three-level media“. Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184560.
Der volle Inhalt der QuelleBruno, Angelo. „Dissipation, mixing and two level system in quantum field theory“. Doctoral thesis, Universita degli studi di Salerno, 2012. http://hdl.handle.net/10556/290.
Der volle Inhalt der QuelleIn this dissertation we discuss several aspects of a two level system (qubit) in the context of quantum mechanics and quantum field theory. The presence of geometrical phases in the evolution of a qubit state is shown. We study geometric structures, which are correlated to an unitary time evolution and its interesting gauge structure. They can be very useful in quantum computational processes. We illustrate the quantum field theoretical formulation of boson mixed fields, and oscillation formulas for neutral and charged fields are found. We show that the space for the mixed fields is unitary inequivalent to the state space where the unmixed field are defined, and we also derive the structure of the currents and charges for the charged mixed fields. Phenomenological aspects of meson mixing in the presence of the decay are discussed. In particular, we show that the effective Hamiltonian is non-Hermitian and non-normal in the Wigner-Weisskopf approximation and we use the biorthonormal basis formalism to diagonalize such an Hamiltonian. Finally, the presence of CP and CPT violations in meson mixing is shown. [edited by author]
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Patel, Meena. „Numerical study of non-linear spectroscopy and four-wave-mixing in two and multi-level atoms“. Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2623.
Der volle Inhalt der QuelleIn this research, we undertake a numerical study of the interaction between laser beams and two as well as multi-level atoms. The main aim of this research is to obtain a deeper understanding of laser-atom interactions and non-linear processes such as optical four-wave mixing. This work will supplement experiments to be conducted by other members of the group, who are involved in generating entangled photons via four-wave mixing in cold rubidium atoms. We begin by performing a basic study of the interaction between laser beams and two-level atoms as an aid to gain knowledge of numerical techniques, as well as an understanding of the physics behind light-atom interactions. We make use of a semi-classical approach to describe the system where the atoms are treated quantum mechanically and the laser beams are treated classically. We study the interaction between atoms and laser beams using the density matrix operator and Maxwell's equations respectively. By solving the optical Bloch equations for two-level atoms we examine the atomic populations and coherences and present plots of the density matrix elements as a function of time. The e ects of various parameters such as laser intensity, detuning and laser modulation have been tested. The behaviour of the laser beam as it propagates through the atomic sample is also studied. This is determined by Maxwell's equation where the atomic polarization is estimated from the coherence terms of the density matrix elements.
French South African Institute of Technology National Research Foundation
Kubasch, Madeleine. „Approximation of stochastic models for epidemics on large multi-level graphs“. Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. https://theses.hal.science/tel-04717689.
Der volle Inhalt der QuelleWe study an SIR model with two levels of mixing, namely a uniformly mixing global level, and a local level with two layers of household and workplace contacts, respectively. More precisely, we aim at proposing reduced models which approximate well the epidemic dynamics at hand, while being more prone to mathematical analysis and/or numerical exploration.We investigate the epidemic impact of the workplace size distribution. Our simulation study shows that if the average workplace size is kept fixed, the variance of the workplace size distribution is a good indicator of its influence on key epidemic outcomes. In addition, this allows to design an efficient teleworking strategy. Next, we demonstrate that a deterministic, uniformly mixing SIR model calibrated using the epidemic growth rate yields a parsimonious approximation of the household-workplace model.However, the accuracy of this reduced model deteriorates over time and lacks theoretical guarantees. Hence, we study the large population limit of the stochastic household-workplace model, which we formalize as a measure-valued process with continuous state space. In a general setting, we establish convergence to the unique deterministic solution of a measure-valued equation. In the case of exponentially distributed infectious periods, a stronger reduction to a finite dimensional dynamical system is obtained.Further, in order to gain a finer insight on the impact of the model parameters on the performance of both reduced models, we perform a sensitivity study. We show that the large population limit of the household-workplace model can approximate well the epidemic even if some assumptions on the contact network are relaxed. Similarly, we quantify the impact of epidemic parameters on the capacity of the uniformly mixing reduced model to predict key epidemic outcomes.Finally, we consider density-dependent population processes in general. We establish a many-to-one formula which reduces the typical lineage of a sampled individual to a time-inhomogeneous spinal process. In addition, we use a coupling argument to quantify the large population convergence of a spinal process
Ward, Duncan Estcourt. „The two-phase plane turbulent mixing layer /“. Title page, contents and abstract only, 1986. http://web4.library.adelaide.edu.au/theses/09PH/09phw257.pdf.
Der volle Inhalt der QuelleMorlock, Merlin B. „Nonlinear mixing of two collinear Rayleigh waves“. Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50280.
Der volle Inhalt der QuelleCAPRON, BARBARA ANNE. „TWO-PHOTON MULTIWAVE MIXING (DOPPLER-FREE SPECTROSCOPY)“. Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183854.
Der volle Inhalt der QuelleCosta-Patry, Etienne. „Mixing of two scalars in turbulent channel flow“. Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=83859.
Der volle Inhalt der QuelleThe transverse, total RMS temperature profiles are a function of the separation distance between the line sources (d/h), their average wall-normal position (ys_av/h), and the downstream location (x/h) (relative to the line sources). The non-dimensional form of the scalar covariance, the correlation coefficient (rho), is a function of the same parameters and quantifies the mixing of the two scalars.
In all cases, the transverse profiles of the correlation coefficient flatten and tend towards 1 as x/h increases. The minimum value of the correlation coefficient for a given transverse profile (rhomin) drifts towards the wall for line source combinations that are not symmetric about the channel centreline. (For profiles that are symmetric about the centreline, the minimum correlation coefficient always occurs at the centreline.) The initial downstream evolution of rhomin (and rhoys_av/h - the value of the correlation coefficient measured at the average wall-normal source location) depend mostly on d/h. Therefore, to an extent, the measured evolutions are similar to those in homogeneous turbulence. However, the dependence on Ys_av/h is never entirely negligible. At a certain downstream position, the (inhomogeneous) high turbulence intensity (found near the wall) serves to accelerate the scalar mixing.
For line source combinations that are not influenced by the above-mentioned, near-wall, high turbulence intensities, spectral analysis indicates that the degree of mixing across scales is relatively constant for the range of parameters studied herein. In the case of near-wall mixing, the large scales were found to evolve more rapidly. This presumably derives from the large-scale nature of turbulence production, which is strong in the nearwall region.
Grunnet-Jepsen, Anders. „Two-wave mixing and subharmonic instability in photorefractive materials“. Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260761.
Der volle Inhalt der QuellePeereboom, Nick C. (Nicolaas Christopher) Carleton University Dissertation Engineering Electrical. „Optical two-wave mixing in iron-doped indium phosphide“. Ottawa, 1992.
Den vollen Inhalt der Quelle findenAbadie, Thomas. „Hydrodynamics of gas-liquid Taylor flow in microchannels“. Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/11986/1/abadie.pdf.
Der volle Inhalt der QuelleSeyed, Mahmoudi Seyed Mohammad. „Velocity and mixing characteristics of stirred vessels with two impellers“. Thesis, King's College London (University of London), 1993. https://kclpure.kcl.ac.uk/portal/en/theses/velocity-and-mixing-characteristics-of-stirred-vessels-with-two-impellers(b0de9b2e-70e2-4133-9d3e-3955562edfb0).html.
Der volle Inhalt der QuelleDimou, Konstantina. „Simulation of estuary mixing using a two-dimensional random walk model“. Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14351.
Der volle Inhalt der QuelleLee, Wei-Koon. „Chaotic mixing in wavy-type channels and two-layer shallow flows“. Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:f5fcbe34-babb-4fae-9204-28de8774eb98.
Der volle Inhalt der QuelleDaneshvar, Ahrash. „Interaction and mixing effects in two and one dimensional hole systems“. Thesis, University of Cambridge, 2008. https://www.repository.cam.ac.uk/handle/1810/198364.
Der volle Inhalt der QuelleGartside, James Nicholas Burgess. „Nonlinear interaction of two oblique modes in a supersonic mixing layer“. Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187386.
Der volle Inhalt der QuelleOliver, Eric C. J. „Spinning and mixing: Two studies of microfluidic problems using molecular dynamics simulations“. Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27400.
Der volle Inhalt der QuelleQue, Fucheng. „Dynamic simulation of gas-liquid mixing in a two-dimensional bubble column“. Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281982.
Der volle Inhalt der QuelleMcGinnis, Daniel Frank. „Two-Dimensional Lake and Reservoir Modeling: Natural and Plume-Induced Mixing Mechanisms“. Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/29395.
Der volle Inhalt der QuellePh. D.
Landel, Julien Rémy Dominique Gérard. „Dynamics of quasi-two-dimensional turbulent jets“. Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/244569.
Der volle Inhalt der QuelleLemus, Jorge Ernesto 1961. „Phonology at two levels: A new model of lexical phonology“. Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/289144.
Der volle Inhalt der QuelleDonaldson, Paul Murray. „Two dimenstional infrared four wave mixing spectroscopy of simple molecules, peptides and proteins“. Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/1245.
Der volle Inhalt der QuelleBerube, D. Steven. „Assessing differences in data and information makeup at two different organizational levels using two managerial jobs“. Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03032009-040410/.
Der volle Inhalt der QuelleHazelton, William Donald. „Configuration mixing of quark states in nucleons and other baryons in the MIT bag model /“. Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/9770.
Der volle Inhalt der QuelleAkhtar, Kareem. „Numerical Investigation using RANS Equations of Two-dimensional Turbulent Jets and Bubbly Mixing layers“. Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/34512.
Der volle Inhalt der QuelleMaster of Science
Hellenthal, Alexander Johannes. „A tale of two levels : there is an "I" in team /“. Ridderkerk : Labyrinth Publications, 2004. http://www.gbv.de/dms/sub-hamburg/393558754.pdf.
Der volle Inhalt der QuelleDavila, Yvonne A. „QSEN Competency Confidence Levels in Two Groups of New Registered Nurses“. ScholarWorks, 2019. https://scholarworks.waldenu.edu/dissertations/6549.
Der volle Inhalt der QuelleThrelfall, James W. „Wave propagation, phase mixing and dissipation in Hall MHD“. Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3182.
Der volle Inhalt der QuelleSalegio, Julius. „Agroforestry participation, a comparison of organizational levels in two Salvadoran rural communities“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60492.pdf.
Der volle Inhalt der QuelleAkers, Stephen Andrew. „Two-Dimensional Finite Element Analysis of Porous Geomaterials at Multikilobar Stress Levels“. Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/30070.
Der volle Inhalt der QuellePh. D.
Naußed, David, und Ruta Sapokaite. „Evaluation of Procedural Content Generators for Two-Dimensional Top-Down Dungeon Levels“. Thesis, Uppsala universitet, Institutionen för speldesign, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-446471.
Der volle Inhalt der QuellePendyam, Sandeep Nair Satish S. „Computational neural modeling at the cellular and network levels two case studies /“. Diss., Columbia, Mo. : University of Missouri--Columbia, 2007. http://hdl.handle.net/10355/4899.
Der volle Inhalt der QuelleLivingston, M., D. T. Ray und D. J. Jr Garrot. „Evaluation of Two Levels of Irrigation in Relation to Calsweet Watermelon Yield“. College of Agriculture, University of Arizona (Tucson, AZ), 1987. http://hdl.handle.net/10150/221259.
Der volle Inhalt der QuelleElgort, andrew Charles. „Reducing teachers' levels of stress: A comparison of two counseling treatment models“. W&M ScholarWorks, 1992. https://scholarworks.wm.edu/etd/1539618684.
Der volle Inhalt der QuelleHarrell, Greg S. „Testing and modeling of a two-phase ejector“. Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/39122.
Der volle Inhalt der QuellePh. D.
Suberg, Lavinia A. „Investigations of the variability of tidal mixing fronts and their importance for shelf-sea ecosystems across multiple trophic levels“. Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/400389/.
Der volle Inhalt der QuelleSadek, Nabel. „Comparison of Two Vortex-in-cell Schemes Implemented to a Three-dimensional Temporal Mixing Layer“. Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23198.
Der volle Inhalt der QuelleMitchell, 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.
Der volle Inhalt der QuelleBarriquand, Tamara. „The Impact of Environmental Conditions on Internal Waves and Mixing in Two Distinct Ocean Basins“. Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066682/document.
Der volle Inhalt der QuelleInternal waves are ubiquitous in the ocean, and play a key role in the global overturning circulation. This thesis analyzes the life cycle of internal waves in two distinct ocean basins: the Arctic and Indian Oceans. Hydrographic and velocity data are used to study the generation, propagation, and dissipation of internal waves in these two ocean basins. In the Indian Ocean, an area of mixing-driven upwelling, mooring data reveal the presence of a strong internal tide propagating as tidal beams above the Southwest Indian Ridge in the Indian Ocean basin. These tidal beams show a strong vertical structure, and their path of propagation is highly dependent on the mesoscale activity in the region. Despite this strong internal tide signal, however, mixing in the region is dominated by inertial internal waves. On the other side of the globe, in a region of deep water formation, shipboard data from four short time series from three consecutive springs in Storfjorden, an Arctic fjord in the Svalbard Archipelago, reveal a link between the vertical structure of the stratification profile and mixing in the Arctic. These environmental conditions, the changing mesoscale in the Indian Ocean, and the changing stratification in the Arctic Ocean, greatly impact the generation, propagation, and dissipation of internal waves, and subsequent turbulent mixing in theses two ocean basins
Barriquand, Tamara. „The Impact of Environmental Conditions on Internal Waves and Mixing in Two Distinct Ocean Basins“. Electronic Thesis or Diss., Paris 6, 2014. http://www.theses.fr/2014PA066682.
Der volle Inhalt der QuelleInternal waves are ubiquitous in the ocean, and play a key role in the global overturning circulation. This thesis analyzes the life cycle of internal waves in two distinct ocean basins: the Arctic and Indian Oceans. Hydrographic and velocity data are used to study the generation, propagation, and dissipation of internal waves in these two ocean basins. In the Indian Ocean, an area of mixing-driven upwelling, mooring data reveal the presence of a strong internal tide propagating as tidal beams above the Southwest Indian Ridge in the Indian Ocean basin. These tidal beams show a strong vertical structure, and their path of propagation is highly dependent on the mesoscale activity in the region. Despite this strong internal tide signal, however, mixing in the region is dominated by inertial internal waves. On the other side of the globe, in a region of deep water formation, shipboard data from four short time series from three consecutive springs in Storfjorden, an Arctic fjord in the Svalbard Archipelago, reveal a link between the vertical structure of the stratification profile and mixing in the Arctic. These environmental conditions, the changing mesoscale in the Indian Ocean, and the changing stratification in the Arctic Ocean, greatly impact the generation, propagation, and dissipation of internal waves, and subsequent turbulent mixing in theses two ocean basins
Franche, Renée-Louise. „The interpersonal response to depression as a function of two levels of intimacy“. Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26814.
Der volle Inhalt der QuelleArts, Faculty of
Psychology, Department of
Graduate
Pokhrel, Usmita. „Role of Mixing of Two Bacteria on Compressive Strength, Water Absorption and Microstructure of Mortar Cubes“. Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/31691.
Der volle Inhalt der QuelleHuth, Anne M. Kramer. „Geochemical and isotopic mixing models : two case studies in a snow-dominated and semi-arid environment“. Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/191260.
Der volle Inhalt der QuelleSparks, Sara A. „Two phase mixing comparison, oil contamination comparison and manufacturing accuracy effect on calibration of slotted orifice meter“. Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/1088.
Der volle Inhalt der QuelleSparks, Sara A. „Two phase mixing comparison, oil contamination comparison and manufacturing accuracy effect on calibration of slotted orifice meters“. Texas A&M University, 2004. http://hdl.handle.net/1969.1/1088.
Der volle Inhalt der QuelleShaw, Duncan Andrew. „The effect of suspended sediment concentration on the mixing of neutrally buoyant aqueous phase tracers in open channel flows“. Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340129.
Der volle Inhalt der QuelleIbrahim, Rita M. „Effect of Two Breeds and Two Dietary Concentrate Levels on Feedlot Performance, Carcass Merit, Tenderness parameters and fatty Acid Profiles“. Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/196131.
Der volle Inhalt der QuelleLowe, Leroy. „Improving student's intrinsic motivation levels in a two year college international business diploma program“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0019/MQ56789.pdf.
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