Dissertations / Theses on the topic 'Three-Body Interactions'
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Mermod, Philippe. "Neutron-Deuteron Scattering and Three-Body Interactions." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6739.
Full textYan, Hongmei. "Computations of fully nonlinear three-dimensional wave-body interactions." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61616.
Full textCataloged from PDF version of thesis.
Includes bibliographical references.
Nonlinear effects in hydrodynamics of wave-body interaction problems become critically important when large-amplitude body motions and/or extreme surface waves are involved. Accurate prediction and understanding of these fully nonlinear effects are still challenges in the design of surface ships and marine structures, owing to the complexity of the hydrodynamic problem itself and limited computational facilities. This research is focused on: (i) development of a highly efficient numerical scheme for the computation of fully-nonlinear three-dimensional wave-body interactions; and (ii) investigation of several highly nonlinear wave-body interaction problems for understanding associated key nonlinear effects. A highly efficient high-order boundary element method is developed based on the framework of the quadratic boundary element method (QBEM) for the boundary integral equation and using the pre-corrected fast Fourier transform (PFFT) algorithm to accelerate the evaluation of far-field influences of source and/or normal dipole distributions on boundary elements. The resulting numerical scheme reduces the computational effort of solving the boundary-value problem from O(N 2 ~3) (with the traditional boundary element methods) to O(N ln N) where N represents the total number of boundary unknowns. Combining with the mixed-Eulerian-Lagrangian (MEL) approach for nonlinear free surface tracking, we develop an efficient and accurate initial boundary value problem (IBVP) solver, PFFT-QBEM, which allows for practical simulations of fully nonlinear three-dimensional wave-body interaction problems. Three nonlinear wave-body interaction problems, which are of scientific interest and practical importance, are investigated in detail: water surface impact of threedimensional objects, cavity dynamics in water entries, and coupled unstable motions of floating structures in waves. For the water impact problem, with the development of an adaptive jet flow treatment and an effective approach for accurately tracking water-body separation point/line, we obtain a thorough understanding of the gravity effect on the characteristics of slamming pressure/load on the object and free-surface profiles. For the cavity problem, we investigate the formation and evolution of an air cavity behind an object dropped into water (from air) at relatively low Froude numbers where the inertia and gravity effects are comparable. A theoretical solution is newly derived based on a matched asymptotic approach and a fully nonlinear numerical simulation is carried out, for the description of the kinematics and dynamics of the air cavity. Satisfactory quantitative comparisons are obtained among the theoretical predictions, numerical simulations, and existing experimental measurements for the dependence of cavity shape and closure time/height on Froude number and body geometry. For floating structures in waves, our focus is on the understanding of the fundamental mechanism and basic characteristics for coupled unstable heave-pitch motions of floating platforms/vessels. Through stability analyses, we identify that the second-order difference-frequency interaction between surface waves and body motions is the key mechanism for the excitation of unstable resonant motions. Fully nonlinear simulations are conducted to study the development of large-amplitude body motions and investigate quantitatively the dependence of the instability on related physical parameters, such as incident wave amplitude and phase, frequency detuning, body geometry, and system damping. Theoretical analyses and numerical simulations are verified by comparison to available experiments for the coupled unstable motions of a deep draft caisson vessel (DDCV).
by Hongmei Yan.
Ph.D.in Ocean Engineering
Bush, Matthew Peter. "Spin-dependent interactions in the three-body eikonal model." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/844619/.
Full textMohr, Richard Frank Jr. "Quantum mechanical three-body problem with short-range interactions." Connect to this title online, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1050007430.
Full textTitle from first page of PDF file. Document formatted into pages; contains xiii, 182 p.; also includes graphics Includes bibliographical references (p. 181-182). Available online via OhioLINK's ETD Center
Xue, Ming 1967. "Three-dimensional fully-nonlinear simulations of waves and wave body interactions." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10216.
Full textMarcelli, Gianluca, and g. marcelli@imperial ac uk. "The role of three-body interactions on the equilibrium and non-equilibrium properties of fluids from molecular simulation." Swinburne University of Technology. Centre for Molecular Simulation, 2001. http://adt.lib.swin.edu.au./public/adt-VSWT20060112.082425.
Full textFaoro, Riccardo. "Few-body interactions in cold Rydberg atoms." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS180/document.
Full textThe aim of this thesis is to investigate different aspects of few-body interactions in cold Rydberg atoms. It has been realized in a co-tutelle program between the University of Paris-Saclay and the University of Pisa working on two different experimental set ups: one at Laboratoire Aimé Cotton on cold Cs Rydberg atoms and a second at Physics Department of Pisa on cold Rb Rydberg atoms. In Laboratoire Aimé Cotton we demonstrated the existence of new few-body interactions we observed in a frozen Rydberg gas of Cs atoms. These new resonances are a generalization of already known two-body Förster resonances. They act on the internal degrees of freedom of the Rydberg atoms leading to a resonant energy transfer analogous to the one in FRET (Fluorescence Resonance Energy Transfer). In analogy with Förster resonance, three-body FRETs are tuned with an external electric field and can be observed for different principal quantum number. The three-body interaction appeared in the absence of any two-body ones and for this reasons it has a Borromean character. The presence of this external electric field leads to additional resonances between Rydberg atoms supposedly forbidden. These resonances, we call quasi-forbidden Förster resonances, are due to dipole-dipole interaction as in the case of Förster resonance. We investigated these resonances finding a large number close to the allowed two-body and three-body FRET. A precise study was necessary in order to identify and discriminate these resonances from the allowed ones.In the experiment in Pisa we instead focus our attention on the mechanical effect of van der Waals repulsion between Rydberg atoms. We studied the spatial expansion due to a van der Waals interaction in a 1D chain of Rb Rydberg atoms excited with an off-resonant laser excitation. The comparison of the spatial expansion for different detuning of the laser excitation reveals the central role of the van der Waals interaction whose strength is equal to the detuning of the laser excitation
Tang, Chun Quan. "Time domain three-dimensional fully nonlinear computations for body-wave interaction in a dynamic visualization architecture." Thesis, University of Strathclyde, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428846.
Full textMallardeau, Catherine. "L'hydrogène atomique polarisé : interaction avec les films d'Helium : expérience de compression." Paris 6, 1986. http://www.theses.fr/1986PA066186.
Full textReyes, Estany Miguel. "Human Pose Analysis and Gesture Recognition from Depth Maps: Methods and Applications." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/403985.
Full textEl análisis visual de personas es uno de los temas de investigación más activos en Visión Computacional. Varios enfoques para la recuperación de la postura corporal se han presentado recientemente, que permiten una mejor generalización de los sistemas de reconocimiento de gestos. La evaluación de los patrones de comportamiento humano en diferentes ambientes ha sido un problema de estudio en las ciencias sociales y cognitivas, pero actualmente se presenta como un reto para las ciencias informáticas, dada la complejidad de la extracción de datos y su análisis. Entre las principales dificultades del análisis visual de los datos n RGB está la discriminación de las formas, texturas, objetos de fondo, cambios en las condiciones de iluminación y puntos de vista. En contraste con las imágenes RGB comunes utilizadas en Visión Computacional, imágenes de rango aportan información adicional sobre mundo 3-D, lo que permite capturar la información de profundidad de cada pixel en la imagen. Además, el uso de mapas de profundidad es de creciente interés después de la llegada de los dispositivos multisensor baratos basados en luz estructurada, o la tecnología de Tiempo de Vuelo (TOF, por sus siglas en inglés). En este trabajo analizaremos el problema de la postura y el movimiento humano en imágenes RGB con profundidad, y en particular: 1) la actitud humana de recuperación de la postura, 2) descripción de posiciones de la mano, y 3) el reconocimiento de gestos. Vamos a tratar estas tres áreas mediante el uso de los datos RGB-Profundos con el fin de sacar provecho de la representación visual y la información geométrica en 3-D. El uso de los dos canales de información mejora la eficiencia de los métodos de análisis de movimiento y postura humanos. También presentamos un uso eficiente de los métodos propuestos en campos de aplicación real, como la salud y la interacción persona-ordenador (HCI). Nuestros principales objetivos son establecer la viabilidad del uso de mapa de profundidad en la estimación de pose de la mano y el cuerpo humano y, por otro lado, para el reconocimiento de gestos. Adicionalmente se presenta el impacto de éstas en aplicaciones reales con alto impacto social.
Günther, Anneke. "Nuclear Structure with Unitarily Transformed Two-Body plus Phenomenological Three-Body Interactions." Phd thesis, 2011. http://tuprints.ulb.tu-darmstadt.de/2422/1/AnnekeGuenther_Dissertation.pdf.
Full textGünther, Anneke [Verfasser]. "Nuclear structure with unitarily transformed two-body plus phenomenological three-body interactions / von Anneke Günther." 2011. http://d-nb.info/1010561863/34.
Full textBryant, Eleanor J., K. Keizebrink, N. King, and J. E. Blundell. "Interaction between disinhibition and restraint: Implications for body weight and eating disturbance." 2010. http://hdl.handle.net/10454/5743.
Full textAn increase in obesity is usually accompanied by an increase in eating disturbances. Susceptibility to these states may arise from different combinations of underlying traits: Three Factor Eating Questionnaire (TFEQ) Restraint and Disinhibition. Two studies were conducted to examine the interaction between these traits; one on-line study (n=351) and one laboratory-based study (n=120). Participants completed a battery of questionnaires and provided self-report measures of body weight and physical activity. A combination of high Disinhibition and high Restraint was associated with a problematic eating behaviour profile (EAT-26), and a higher rate of smoking and alcohol consumption. A combination of high Disinhibition and low Restraint was associated with a higher susceptibility to weight gain and a higher sedentary behaviour. These data show that different combinations of Disinhibition and Restraint are associated with distinct weight and behaviour outcomes.
Guha, Amitava 1984. "Development of a Computer Program for Three Dimensional Frequency Domain Analysis of Zero Speed First Order Wave Body Interaction." Thesis, 2012. http://hdl.handle.net/1969.1/148193.
Full textChen, Cheng, and 陳徵. "A Simulation Of The Gravitational And Collisional Interaction Of Saturn's F Ring With The Shepherding Moon, Prometheus, By Elliptic Restricted Three-Body Calculation." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/06715414775410778879.
Full text國立中央大學
天文研究所
104
Because of their eccentricities, the narrow F ring of Saturn and one of the shepherding moons, Prometheus, can intercept each other's orbit. This process would lead to the formation of kinky and segmented structures along the F ring when Prometheus penetrate into the F ring. Besides gravitational scattering, collisional impact at the surface of Prometheus by the F ring particle could also occur. The numerical method in the elliptic restricted three-body problem is used to simulate the orbital motion of the F ring particles under the influence of Prometheus with a view to understand the related dynamical perturbation and mass loss (or accretion) effect in the vicinity of the Roche limit.
Khatri, Ghanshyambhai. "Investigation of Deuteron Disintegration." Praca doktorska, 2015. https://ruj.uj.edu.pl/xmlui/handle/item/45461.
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