Dissertations / Theses on the topic 'Numerical techniques'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Numerical techniques.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Hudson, Justin. "Numerical techniques for morphodynamic modelling." Thesis, University of Reading, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394022.
Full textDjambazov, Georgi Stefanov. "Numerical techniques for computational aeroacoustics." Thesis, University of Greenwich, 1998. http://gala.gre.ac.uk/6149/.
Full textFraser-Andrews, G. "Numerical techniques for singular optimal trajectories." Thesis, University of Hertfordshire, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372080.
Full textHyde, Paul. "Numerical techniques for optimising rail grinding." Thesis, University of Newcastle upon Tyne, 2012. http://hdl.handle.net/10443/1468.
Full textO'Sullivan, E. A. "Numerical noise reduction techniques in signal processing." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426583.
Full textMvondo, Bernardin Gael. "Numerical techniques for optimal investment consumption models." University of the Western Cape, 2014. http://hdl.handle.net/11394/4352.
Full textThe problem of optimal investment has been extensively studied by numerous researchers in order to generalize the original framework. Those generalizations have been made in different directions and using different techniques. For example, Perera [Optimal consumption, investment and insurance with insurable risk for an investor in a Levy market, Insurance: Mathematics and Economics, 46 (3) (2010) 479-484] applied the martingale approach to obtain a closed form solution for the optimal investment, consumption and insurance strategies of an individual in the presence of an insurable risk when the insurable risk and risky asset returns are described by Levy processes and the utility is a constant absolute risk aversion. In another work, Sattinger [The Markov consumption problem, Journal of Mathematical Economics, 47 (4-5) (2011) 409-416] gave a model of consumption behavior under uncertainty as the solution to a continuous-time dynamic control problem in which an individual moves between employment and unemployment according to a Markov process. In this thesis, we will review the consumption models in the above framework and will simulate some of them using an infinite series expansion method − a key focus of this research. Several numerical results obtained by using MATLAB are presented with detailed explanations.
Kawabata, Hideyuki. "Compiler techniques for large-scale numerical computations." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/145358.
Full textScott, Michael Andrew. "Interior node projection techniques in sweeping algorithms /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1121.pdf.
Full textPeter, Felix. "A quantitative comparison of numerical option pricing techniques." St. Gallen, 2008. http://www.biblio.unisg.ch/org/biblio/edoc.nsf/wwwDisplayIdentifier/01592823001/$FILE/01592823001.pdf.
Full textBalcázar, Arciniega Néstor Vinicio. "Numerical simulation of multiphase flows : level-set techniques." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/279386.
Full textÉsta tesis se enfoca en el desarrollo de métodos numéricos basados en la aplicación de técnicas level-set para la Simulación Numérica Directa (DNS) de flujos interfaciales y flujos de superficie libre, con el objetivo de ser usados tanto en investigación básica como en aplicaciones industriales. Primero, el método level-set conservativo desarrollado para la captura de interfaces entre dos fluidos, es combinado con un esquema de proyección adaptado para un fluido de densidad variable, con el objetivo de simular flujos de dos fases en mallas no estructuradas. Todas las ecuaciones son discretizadas mediante una aproximación de volúmenes finitos sobre un arreglo de malla colocada. Un esquema de alto orden cuya formulación se basa en el uso de limitadores de flujo, es usado para la discretización de los términos convectivos, mientras que los flujos difusivos son calculados mediante diferencias centradas. Los gradientes son calculados mediante el método de los mínimos cuadrados, en tanto que se asume que las propiedades físicas varían suavemente en una zona estrecha alrededor de la interface con el objetivo de evitar inestabilidades numéricas. La tensión superficial es incorporada mediante el enfoque de la fuerza superficial continua. El método numérico es validado con respecto a los datos experimentales y numéricos reportados en la literatura científica. Segundo, el método level-set conservativo es aplicado en el estudio del flujo de burbujas conducidas por la gravedad. A diferencia de los casos precedentes, se aplica una condición de frontera periódica en la dirección vertical, con el objetivo de simular un canal de longitud infinita. La forma y velocidad terminal de una burbuja ascenciendo en un líquido inicialmente en reposo son calculadas y contrastadas con los resultados reportados en la literatura. Adicionalmente se estudia la interacción hidrodinámica de un par de burbujas para diferentes configuraciones, y finalmente se explora la interacción de un emjambre de burbujas ascendiendo en un canal vertical. En la tercera parte de ésta tesis, se presenta una nueva metodología para la simulación de flujos interfaciales conducidos por la tensión superficial, mediante la combinación de los métodos volume-of-fluid y level-set. La idea principal se basa en usar el método volume-of-fluid para advectar la interface, minimizando las pérdidas de masa, mientras que las propiedades geométricas de la interface se calculan a partir de una función level-set obtenida mediante un algoritmo geométrico iterativo. La propiedades geométricas así calculadas son usadas para el cómputo de la tensión superficial. El método numérico es validado mediante casos bi y tri-dimensionales bien conocidos en la literatura científica. La conservación de la masa es excelente en tanto que la precisión del método es altamente satisfactoria incluso en los casos más complejos. En la cuarta parte de ésta tesis se presenta un nuevo método level-set de múltiples marcadores. Éste método es diseñado para llevar a cabo simulaciones numéricas de partículas de fluido deformables, evitando la coalescencia numérica de las interfaces. Cada partícula de fluido es capturada por una función level-set distinta, así, diferentes interfaces pueden ser resueltas en el mismo volumen de control, evitando la coalescencia artificial y potencialmente no-física de las partículas fluidas. Por lo tanto, las burbujas (o gotas) pueden acercarce y colisionar. El algoritmo es propuesto en el contexto del método level-set conservativo, mientras que la tensión superficial se resuelve mediante una adaptación del enfoque de la fuerza superficial continua. Para su validación, se estudia el impacto conducido por la gravedad de una gota sobre una interface líquido-líquido; luego, se estudia la collisión de dos gotas con salida rebotante, y finalmente el método numérico es aplicado para la simulación de un enjambre de burbujas sin coalescencia numérica.
Ortega, Gelabert Olga. "Advanced numerical techniques for inverse problems in geophysics." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/670631.
Full textAquesta tesi introdueix una metodologia eficient per acoblar tècniques de Reducció d’Ordre del Model dins el marc de problemes d’inversió probabilística en geofísica. Disposar de models precisos sobre la interacció entre els processos interns de la Terra i les característiques superficials és essencial per tal de fer prediccions fiables dels observables, ja que aquests són una part fonamental de la inferència Bayesiana. Els mètodes de Markov Chain Monte Carlo (MCMC) s’han convertit en un estàndard per tractar amb inversions probabilístiques i es basen en estratègies de mostreig que requereixen solucionar molts problemes directes moltes vegades. L’elevat cost computacional dels problemes directes a gran escala és el principal coll d’ampolla que pot limitar les capacitats i potencial de les inversions probabilístiques multi-observables en geofísica. En concret, els efectes dinàmics provinents del flux del mantell sub-litosfèric no es solen tenir en compte per a l’estimació de l’elevació de la superfície degut a l’elevat cost computacional derivat de resoldre el problema associat de flux de Stokes en 3D. La idea principal d’aquesta tesi es fer servir el mètode de la Base Reduida (RB) com a substitut del problema directe real (flux 3D Stokes) per tal d’obtenir aproximacions ràpides i precises. El substitut es fa servir per generar mostres de la distribució posterior amb un cost computacional molt inferior. Les estratègies RB es basen en expressar la solució d’un problema en un espai de baixa dimensió, i.e. una base reduïda. Aprofitant la naturalesa convergent del MCMC, proposem una estratègia “greedy” que construeix la base sobre la marxa i segons ho requereixi el problema invers. D’aquesta forma, la base està feta a mida per adaptar-se a les característiques posteriors del problema. A més, per tal de garantir la precisió del substitut, definim un estimador d’error “goal-oriented” que es centra en una Quantitat d’Interès específica del problema i, per tant, guia a la base per tal d’aconseguir la precisió necessària en aquelles característiques en particular. Tot això es tradueix en una base adaptada al problema que es més compacta i petita que si hagués de ser precisa en tot el domini. A més, per tal d’afrontar el car assemblatge de les matrius, utilitzem la parametrització del problema i l’estratègia de mostreig per definir una estratègia d’assemblatge que actualitza eficientment les matrius només amb la contribució d’aquells elements que han canviat entre passos successius de la inversió. Els beneficis i limitacions del mètode s’il·lustren a traves de varis exemples numèrics. Finalment, per demostrar l’aplicabilitat del mètode, es presenten dues inversions de problemes més realistes. El primer fa servir la topografia dinàmica per a obtenir la profunditat del límit Litosfera-Astenosfera en un domini esfèric que representa una part de la Terra i el segon s’aplica a un problema més gran en que l’estructura litosfèrica d’Àfrica està discretitzada en 1225 paràmetres.
Marmie, John A. "Modern numerical electromagnetic techniques applied to aviation problems." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182443521.
Full textDeo, H. S. "Numerical techniques for predicting aerodynamic characteristics of bodies." Thesis, Cranfield University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371828.
Full textFairbanks, James Paul. "Graph analysis combining numerical, statistical, and streaming techniques." Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/54972.
Full textCraddock, I. J. "Enhanced numerical techniques for time domain electromagnetic analysis." Thesis, University of Bristol, 1995. http://hdl.handle.net/1983/9ac15a09-f4cd-4971-beb4-80f038c0f561.
Full textEid, Rami Samir. "Numerical modelling of geophysical monitoring techniques for CCS." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/22049.
Full textFerguson, R. C. "Numerical techniques for the drift-diffusion semiconductor equations." Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362239.
Full textJones, R. "Numerical optimisation techniques applied to problems in continuum mechanics." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378760.
Full textTiezzi, Ferdinando. "Planar antennas with inhomogeneities : numerical techniques and software engineering /." [S.l.] : [s.n.], 2003. http://library.epfl.ch/theses/?nr=2706.
Full textUrlea, Maria. "Numerical Optimization Techniques for Secure Communications Over MIMO Channels." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31859.
Full textNilsson, Martin. "Fast Numerical Techniques for Electromagnetic Problems in Frequency Domain." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3884.
Full textWormald, S. Andrew. "Numerical techniques in digital microscopic holographic particle image velocimetry." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7140.
Full textWan, Kin Wa. "Advanced numerical and digital techniques in frequency stability analysis." Thesis, University of Portsmouth, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237843.
Full textAboelnor, Mootaz E. "Advanced numerical techniques to simulate soil-tool interface problems." Thesis, University of Strathclyde, 2002. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=20353.
Full textMarriott, John M. "Bayesian numerical and approximation techniques for ARMA time series." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329935.
Full textSepùlveda, Salas Paulina Ester. "Spacetime Numerical Techniques for the Wave and Schrödinger Equations." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4206.
Full textCollinson, Roger. "Mathematical models and numerical techniques for plasticity flows of granular media." Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/1930.
Full textReu, Taekyu. "Techniques for compressible flow calculations on multi-zone grids." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/52327.
Full textPh. D.
Dellaportas, Petros. "Imbedded integration rules and their applications in Bayesian analysis." Thesis, University of Plymouth, 1990. http://hdl.handle.net/10026.1/2067.
Full textCamphouse, R. Chris. "Modeling and Numerical Approximations of Optical Activity in the Chemical Oxygen-Iodine Laser." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28640.
Full textPh. D.
Meister, Neil E. "Application of numerical optimization techniques to surface combatant design synthesis." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA355524.
Full text"September 1998." Thesis advisor(s): Matthew D. Kelleher, C.N. Calvano. Includes bibliographical references (p. 229-230). Also available online.
Zhuang, Sicong. "Communication reduction techniques in numerical methods and deep neural networks." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/668073.
Full textLa comunicació entre els nodes de computació multi-core sorgeix com un dels factors principals que impacta el rendiment d’un sistema HPC d’avui en dia. I més, mentre més core es pusa, pitjor la situació. Per tant aquesta tesi explora les possibles tècniques per a reduir la comunicació en l’execució d’un programa paral·lel. Tot i això, resulta que no existeix una sola tècnica que pugui resoldre aquest obstacle. Tot i que els problemes en cada àmbit, com que té els seus propis caracristics, disposa variosos oportunitats per la reducció de comunicació. La tesi, en primer lloc, dins de l’àmbit de l’àlgebra lineal numèriques desenvolupa un algoritme IFCG que és una evolució de Pipelined CG. IFCG elimina les sincronitzacions normalment posa cap al final de cada iteració per augmentar el paral·lelisme. En la segona contribució, la tesi dirigeix l’atenció a reduir la necessitat de transferir els paràmetres entre el CPU i els GPUs durant l’entrenament d’una xarxa neuronal. Desenvolupa rutines ADT i AWP per comprimir i descomprimir els pesos amb una representació de dades reduïda abans i just desprès de la transferència. La representació es decideix dinàmicament segons el L2-norm dels pesos a cada capa. Al final la tesi disminueix la comunicació en paral·lelitzar el model duna xarxa neurona. En lloc de distribuir les neurones de cada capa als processos disponibles en el sistema, es fa cada dues capes. Així que corta com mitja de la comunicació. En canvi, com que distribueix només cada dues capes, les capes restes es repliquen, resulta que incorre en una augmenta de 50% de computació local.
Saeed, Usman. "Adaptive numerical techniques for the solution of electromagnetic integral equations." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41173.
Full textBaldwin, Emily Clare. "Investigation of impact crater processes using experimental and numerical techniques." Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/15936/.
Full textLu, Zhengxin. "Modelling geotechnical uncertainty using numerical modelling techniques : Kuldip Narbheshankar Modha." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446386.
Full textNaderian, Hamidreza. "Advanced Numerical Techniques for Dynamic and Aerodynamic Analysis of Bridges." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36089.
Full textCollinson, Roger. "Mathematical models and numerical techniques for plasticity flows of granular media." Curtin University of Technology, School of Mathematics and Statistics, 1998. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10697.
Full textOkafor, Anthony. "Entropy based techniques with applications in data mining." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0013113.
Full textSiu, Ka Wai. "Numerical algorithms for data analysis with imaging and financial applications." HKBU Institutional Repository, 2018. https://repository.hkbu.edu.hk/etd_oa/550.
Full textSaha, Reema. "Investigation of a continuum damage model using experimental and numerical techniques." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/12542.
Full textHao, Jinde. "Dynamic responses of soil anchorages using numerical and centrifuge modelling techniques." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2008. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=24846.
Full textCadafalch, Rabasa Jordi. "Numerical Simulation of Turbulent Flows. Multiblock Techniques. Verification and Experimental Validation." Doctoral thesis, Universitat Politècnica de Catalunya, 2002. http://hdl.handle.net/10803/6681.
Full textThe thesis comprises six main chapters written in a paper format. Two of them have already been published in international journals, one in the proceedings of a Spanish conference and two in proceedings of international conferences on Computational Fluid Dynamics and heat transfer. The last chapter has recently been submitted for publication to an international journal. Therefore, all the chapters are written so as to be self-contained, complete and concise. As a consequence, some contents of the chapters such those describing the governing equations, or the verification procedure used to assess the credibility of the numerical solutions, are repeated in several of them. Furthermore, as only minor changes have been introduced in the chapters respect to the original papers, each of them reflects the know-how of the CTTC (Heat and Mass Transfer Technological Centre were the research has been carried out) when they were published.
Papers presented in chapters 1 and 2 deal with turbulence modelling. A general overview is given on the formulation and numerical techniques of the different levels of turbulence modelling: Direct Numerical Simulation (DNS), Large Eddy Simulation (LES) and Reynolds Averaged Navier-Stokes Simulation (RANS). Main attention is focussed on the eddy viscosity two-equation RANS models. Their formulation is presented in more detail, and numerical solutions of the most extended. Benchmark problems on turbulence modelling are given compared to the available experimental data.
Chapters 3 and 4 focus on the use of the multiblock method (domain decomposition method), as a numerical technique that combined with the parallel computing may allow reducing the demanding computational time and memory (high performance computing). The multiblock approach used is based on the conservation of all the physical quantities (fully conservative method) and on an explicit information exchange between the different blocks of the domain. The goal of the work presented in these two chapters is to verify that such a multiblock approach does not introduce additional uncertainty in the numerical solutions.
Chapter 5 presents a tool that has been developed at the CTTC for the verification of finite volume computations. In fact, this tool is also partially used and described in the results presented in the previous chapters. Here, it is described and discussed in detail and it is applied to a set of different CFD and heat transfer problems in two and three dimensions, with free and forced convection, with reactive and non-reactive flows and with laminar and turbulent flows.
The last chapter shows a complete study for the development of a credible heat transfer relation for the heat evacuated from a ventilation channel. Such study comprises all the different steps that have to be accomplished so as to develop credible and applicable results in mechanical engineering. It comprises a description of the mathematical model to represent the physical phenomena in the channel, the numerical model to solve the set of coupled differential equations of the mathematical model, the construction and testing of an ad-hoc experimental set-up, and a verification and validation (V&V) test that guarantees that the numerical solution is an accurate enough approximation of the mathematical model (verification), and that it properly predicts the reality (validation).
He, Xin. "On some Numerical Methods and Solution Techniques for Incompressible Flow Problems." Doctoral thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-179410.
Full textXu, Yizhong. "Wind shielding analysis for cold regions using experimental and numerical techniques." Thesis, University of Hertfordshire, 2016. http://hdl.handle.net/2299/17237.
Full textChoptuik, Matthew William. "A study of numerical techniques for radiative problems in general relativity." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/27043.
Full textScience, Faculty of
Physics and Astronomy, Department of
Graduate
Ariyadasa, A. "Filtering and extrapolation techniques in numerical solution of ordinary differential equations." Thesis, University of Ottawa (Canada), 1985. http://hdl.handle.net/10393/4595.
Full textNoreland, Daniel. "Numerical Techniques for Acoustic Modelling and Design of Brass Wind Instruments." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3507.
Full textMcCollum, Clarence B. "Numerical analysis of the magnetic slider/disk interface using optimization techniques." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/16083.
Full textGroves, T. C. (Thomas Cameron). "The cross : a long poem using the techniques of numerical composition." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26272.
Full textAl-Wahab, Muhanad M. S. "Investigation on the use of different numerical techniques in CAD systems." Thesis, Brunel University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292384.
Full text