Dissertations / Theses on the topic 'Scale decomposition'
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Hawley, Stephen Dwyer. "Adaptive time-scale decomposition for multiscale systems /." Thesis, Connect to this title online; UW restricted, 2008. http://hdl.handle.net/1773/6009.
Full textFinney, John D. "Decomposition and decentralized output control of large-scale systems." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/15606.
Full textShankar, Jayashree. "Analysis of a nonhierarchical decomposition algorithm." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09192009-040336/.
Full textSanneman, Lindsay (Lindsay Michelle). "Decomposition techniques for large-scale optimization in the supply chain." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118674.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 103-105).
Integrated supply chain models provide an opportunity to optimize costs and production times in the supply chain while taking into consideration the many steps in the production and delivery process and the many constraints on time, shared resources, and throughput capabilities. In this work, mixed integer linear programming (MILP) models are developed to describe the manufacturing plant, consolidation transport, and distribution center components of the supply chain. Initial optimization results are obtained for each of these models. Additionally, an integrated model including a single plant, multiple consolidation transport vehicles, and a single distribution center is formulated and initial results are obtained. All models are implemented and optimized for their given objectives using a standard MILP solver. Initial optimization results suggest that it is intractable to solve problems of relevant scale using standard MILP solvers. The natural hierarchical structure in the supply chain problem lends itself well to application of decomposition techniques intended to speed up solution time. Exact techniques, such as Benders decomposition, are explored as a baseline. Classical Benders decomposition is applied to the manufacturing plant model, and results indicate that Benders decomposition on its own will not improve solve times for the manufacturing plant problem and instead leads to longer solve times for the problems that are solved. This is likely due to the large number of discrete variables in manufacturing plant model. To improve upon solve times for the manufacturing plant model, an approximate decomposition technique is developed, applied to the plant model, and evaluated. The approximate algorithm developed in this work decomposes the problem into a three-level hierarchical structure and integrates a heuristic approach at two of the three levels in order to solve abstracted versions of the larger problem and guide towards high-quality solutions. Results indicate that the approximate technique solves problems faster than those solved by the standard MILP solver and all solutions are within approximately 20% of the true optimal solutions. Additionally, the approximate technique can solve problems twice the size of those solved by the standard MILP solver within a one hour timeframe.
by Lindsay Sanneman.
S.M.
Becker, Adrian Bernard Druke. "Decomposition methods for large scale stochastic and robust optimization problems." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68969.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 107-112).
We propose new decomposition methods for use on broad families of stochastic and robust optimization problems in order to yield tractable approaches for large-scale real world application. We introduce a new type of a Markov decision problem named the Generalized Rest less Bandits Problem that encompasses a broad generalization of the restless bandit problem. For this class of stochastic optimization problems, we develop a nested policy heuristic which iteratively solves a series of sub-problems operating on smaller bandit systems. We also develop linear-optimization based bounds for the Generalized Restless Bandit problem and demonstrate promising computational performance of the nested policy heuristic on a large-scale real world application of search term selection for sponsored search advertising. We further study the distributionally robust optimization problem with known mean, covariance and support. These optimization models are attractive in their real world applications as they require the model consumer to only rely on those statistics of uncertainty that are known with relative confidence rather than making arbitrary assumptions about the exact dynamics of the underlying distribution of uncertainty. Known to be AP - hard, current approaches invoke tractable but often weak relaxations for real-world applications. We develop a decomposition method for this family of problems which recursively derives sub-policies along projected dimensions of uncertainty and provides a sequence of bounds on the value of the derived policy. In the development of this method, we prove that non-convex quadratic optimization in n-dimensions over a box in two-dimensions is efficiently solvable. We also show that this same decomposition method yields a promising heuristic for the MAXCUT problem. We then provide promising computational results in the context of a real world fixed income portfolio optimization problem. The decomposition methods developed in this thesis recursively derive sub-policies on projected dimensions of the master problem. These sub-policies are optimal on relaxations which admit "tight" projections of the master problem; that is, the projection of the feasible region for the relaxation is equivalent to the projection of that of master problem along the dimensions of the sub-policy. Additionally, these decomposition strategies provide a hierarchical solution structure that aids in solving large-scale problems.
by Adrian Bernard Druke Becker.
Ph.D.
Ortiz, Diaz Camilo. "Block-decomposition and accelerated gradient methods for large-scale convex optimization." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53438.
Full textScott, Drew. "Decomposition Methods for Routing and Planning of Large-Scale Aerospace Systems." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1617108065278479.
Full textPrescott, Thomas Paul. "Large-scale layered systems and synthetic biology : model reduction and decomposition." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:205a18fb-b21f-4148-ba7d-3238f4b1f25b.
Full textChan, Chi-keung, and 陳志強. "Minimum bounding boxes and volume decomposition of CAD models." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B29947340.
Full textKemenov, Konstantin A. "A New Two-Scale Decomposition Approach for Large-Eddy Simulation of Turbulent Flows." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11520.
Full textNehate, Girish. "Solving large scale support vector machine problems using matrix splitting and decomposition methods /." Search for this dissertation online, 2006. http://wwwlib.umi.com/cr/ksu/main.
Full textNagurney, Anna, and Dae-Shik Kim. "Parallel Computation of Large-Scale Dynamic Market Network Equilibria via Time Period Decomposition." Massachusetts Institute of Technology, Operations Research Center, 1990. http://hdl.handle.net/1721.1/5317.
Full textLocci-Lopez, Daniel Eduardo. "Permian Basin Reservoir Quantitative Interpretation Applying the Multi-Scale Boxcar Transform Spectral Decomposition." Thesis, University of Louisiana at Lafayette, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10816133.
Full textThe Short Time Fourier transform and the S-transform are among the most used methods of spectral decomposition to localize spectra in time and frequency. The S-transform utilizes a frequency-dependent Gaussian analysis window that is normalized for energy conservation purposes. The STFT, on the other hand, has a selected fixed time window that does not depend on frequency. In previous literature, it has been demonstrated that the S-transform distorts the Fourier spectra, shifting frequency peaks, and could result in misleading frequency attributes. Therefore, one way of making the S-transform more appropriate for quantitative seismic signal analysis is to ignore the conservation of energy over time requirement. This suggests a hybrid approach between the Short Time Fourier transform and the S-transform for seismic interpretation purposes. In this work, we introduce the Multi-Scale Boxcar transform that has temporal resolution comparable to the S-transform while giving correct Fourier peak frequencies. The Multi-Scale Boxcar transform includes a special analysis window that focusses the analysis on the highest amplitude portion of the Gaussian window, giving a more accurate time-frequency representation of the spectra in comparison with the S-transform. Post-stack seismic data with a strong well logs control was used to demonstrate the differences of the Multi-Scale Boxcar transform and the S-transform. The analysis area in this work is the Pennsylvanian and Lower Permian Horseshoe Atoll Carbonate play in the Midland Basin, a sub-basin in the larger Permian Basin. The Multi-Scale Boxcar transform spectral decomposition method improved the seismic interpretation of the study area, showing better temporal resolution for resolving the layered reservoirs? heterogeneity. The time and depth scale values on the figures are shifted according to the sponsor request, but the relative scale is correct.
Phipps, Maximillian Joshua Sebastian. "Energy decomposition analysis for large-scale first principles quantum mechanical simulations of biomolecules." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/410305/.
Full textSa, Shibasaki Rui. "Lagrangian Decomposition Methods for Large-Scale Fixed-Charge Capacitated Multicommodity Network Design Problem." Thesis, Université Clermont Auvergne (2017-2020), 2020. http://www.theses.fr/2020CLFAC024.
Full textTypically present in logistics and telecommunications domains, the Fixed-Charge Multicommodity Capacitated Network Design Problem remains challenging, especially when large-scale contexts are involved. In this particular case, the ability to produce good quality soutions in a reasonable amount of time leans on the availability of efficient algorithms. In that sense, the present thesis proposed Lagrangian approaches that are able to provide relatively sharp bounds for large-scale instances of the problem. The efficiency of the methods depend on the algorithm applied to solve Lagrangian duals, so we choose between two of the most efficient solvers in the literature: the Volume Algorithm and the Bundle Method, providing a comparison between them. The results showed that the Volume Algorithm is more efficient in the present context, being the one kept for further research.A first Lagrangian heuristic was devised to produce good quality feasible solutions for the problem, obtaining far better results than Cplex, for the largests instances. Concerning lower bounds, a Relax-and-Cut algorithm was implemented embbeding sensitivity analysis and constraint scaling, which improved results. The increases in lower bounds attained 11\%, but on average they remained under 1\%.The Relax-and-Cut algorithm was then included in a Branch-and-Cut scheme, to solve linear programs in each node of the search tree. Moreover, a Feasibility Pump heuristic using the Volume Algorithm as solver for linear programs was implemented to accelerate the search for good feasible solutions in large-scale cases. The obtained results showed that the proposed scheme is competitive with the best algorithms in the literature, and provides the best results in large-scale contexts. Moreover, a heuristic version of the Branch-and-Cut algorithm based on the Lagrangian Feasibility Pump was tested, providing the best results in general, when compared to efficient heuristics in the literature
Lange, Heinrich. "Solution of large-scale multicommodity network flow problems via a logarithmic barrier function decomposition/." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23397.
Full textWang, Xiaochuan. "A Domain Decomposition Method for Analysis of Three-Dimensional Large-Scale Electromagnetic Compatibility Problems." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338376950.
Full textMirHassani, S. Ali. "An investigation of tools for modelling and solving large scale linear programming problems under uncertainty." Thesis, Brunel University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263504.
Full textAgunwamba, Chukwunomso. "A MATLAB Program to implement the band-pass method for discovering relevant scales in surface roughness measurement." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-theses/89.
Full textGade, Dinakar. "Algorithms and Reformulations for Large-Scale Integer and Stochastic Integer Programs." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343182054.
Full textSherbaf, Behtash Mohammad. "A Decomposition-based Multidisciplinary Dynamic System Design Optimization Algorithm for Large-Scale Dynamic System Co-Design." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535468984437623.
Full textCulioli, Jean-Christophe. "Algorithmes de decomposition/coordination en optimisation stochastique." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0059.
Full textEhrler, Christoph [Verfasser], and S. [Akademischer Betreuer] Hinz. "Scale-Wavelength Decomposition of Hyperspectral Signals - Use for Mineral Classification & Quantification / Christoph Ehrler. Betreuer: S. Hinz." Karlsruhe : KIT-Bibliothek, 2014. http://d-nb.info/1048384926/34.
Full textXu, Chaojun [Verfasser]. "Coordination and Decomposition of Large-Scale Planning and Scheduling Problems with Application to Steel Production / Chaojun Xu." Aachen : Shaker, 2013. http://d-nb.info/1049381610/34.
Full textAli, Rana Shahbaz [Verfasser], and Ellen [Akademischer Betreuer] Kandeler. "Microbial regulation of soil organic matter decomposition at the regional scale / Rana Shahbaz Ali ; Betreuer: Ellen Kandeler." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2019. http://d-nb.info/1176625047/34.
Full textSariyuce, Ahmet Erdem. "Fast Algorithms for Large-Scale Network Analytics." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429825578.
Full textNemoto, Jiro, and Mika Goto. "Productivity, Efficiency, Scale Economies and Technical Change: A New Decomposition Analysis of TFP Applied to the Japanese Prefectures." Elsevier, 2005. http://hdl.handle.net/2237/7770.
Full textWeiglein, Tyler Lorenz. "A Continental-Scale Investigation of Factors Controlling the Vulnerability of Soil Organic Matter in Mineral Horizons to Decomposition." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/101987.
Full textMaster of Science
Salinas, Norma. "Decomposition in tropical forests : results from a large-scale leaf and wood translocation experiment along an elevation gradient in Peru." Thesis, University of Oxford, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.669928.
Full textMukati, Kapil. "An alternative structure for next generation regulatory controllers and scale-up of copper(indium gallium)selenide thin film co-evaporative physical vapor deposition process." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 311 p, 2007. http://proquest.umi.com/pqdweb?did=1397912441&sid=12&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textPrincipal faculty advisor: Babatunde Ogunnaike, Dept. of Chemical Engineering, and Robert W. Birkmire, Dept. of Materials Science & Engineering. Includes bibliographical references.
Burton, Ludovic Nicolas. "Multi-Scale Thermal Modeling Methodology for High Power-Electronic Cabinets." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19808.
Full textWesthoff, Andreas. "Spatial Scaling of Large-Scale Circulations and Heat Transport in Turbulent Mixed Convection." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2012. http://hdl.handle.net/11858/00-1735-0000-000D-FD19-2.
Full textBadillo, Almaraz Hiram. "Numerical modelling based on the multiscale homogenization theory. Application in composite materials and structures." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/83924.
Full textEn esta tesis se propone y desarrolla un método de homogeneización multi-dominio basado en una técnica en dos escalas. El método es capaz de analizar estructuras de materiales compuestos con varias distribuciones periódicas dentro de un mismo continuo mediante la partición de todo el dominio del material compuesto en subestructuras utilizando la teoría clásica de homogeneización a través de una formulación estándar de mecánica de medios continuos de primer orden. La necesidad de desarrollar este método multi-dominio surgió porque los métodos actuales de homogeneización se basan en el supuesto de que todo el dominio del material está representado por solo una distribución periódica o cuasi-periódica. Sin embargo, en algunos casos, la estructura puede estar formada por más de un tipo de distribución de dominio periódico. Los principios teóricos desarrollados en el método de homogeneización multi-dominio se aplicaron para ensamblar una herramienta computacional basada en dos problemas de valores de contorno anidados, los cuales son representados por un código de elementos finitos (FE) en dos escalas: a) una escala global, que trata el material compuesto como un material homogéneo. Esta escala se ocupa de las condiciones de contorno, las cargas aplicadas y los diferentes subdominios periódicos (o cuasi-periódicos) que puedan existir en el material compuesto; y b) una escala local, que obtiene la respuesta homogenizada de un volumen representativo o celda unitaria. Esta escala se ocupa de la geometría, y de la distribución espacial de los constituyentes del compuesto así como de sus propiedades constitutivas. El método se basa en la hipótesis de periodicidad local derivada de la periodicidad de la estructura interna del material. La implementación numérica de las restricciones de los desplazamientos y las fuerzas derivadas de la periodicidad se realizaron por medio del método de multiplicadores de Lagrange. La formulación incluye un método para calcular el tensor constitutivo tangente no-lineal homogeneizado una vez que el umbral de la no-linealidad de cualquiera de las celdas unitarias ha sido superado. El procedimiento se basa en llevar a cabo una derivación numérica aplicando una técnica de perturbación. El tensor constitutivo tangente se calcula para cada incremento de carga y para cada iteración del análisis una vez que la estructura ha entrado en el rango no-lineal. El método de perturbación se aplicó tanto en la escala global como en la local con el fin de analizar la efectividad del método en ambas escalas. Se lleva a cabo un proceso de paralelización en el método con el fin de acelerar el proceso de cómputo debido al enorme coste computacional que requiere la solución iterativa incremental anidada. Se investiga el efecto de ablandamiento por deformación en el material usando el método de homogeneización en dos escalas a través de un enfoque de fractura discreta. Se estudió la objetividad en el mallado dentro de la formulación clásica de FE en una escala y luego los conceptos expuestos se extrapolaron en el marco de la homogeneización de dos escalas. Se enfatiza la importancia de la longitud característica del elemento en un análisis multi-escala en el cálculo de la energía específica disipada cuando se produce el efecto de ablandamiento. Se presentan varios ejemplos para evaluar la propuesta computacional desarrollada en esta investigación. Se estudiaron diferentes configuraciones de compuestos que incluyen diferentes tipos de materiales, así como compuestos que presentan ablandamiento después de que el punto de fluencia del material se alcanza (usando daño y plasticidad) y compuestos con zonas que presentan altos gradientes de deformación. Los ejemplos se llevaron a cabo en materiales compuestos con uno y con varios dominios periódicos utilizando diferentes configuraciones de células unitarias. Los ejemplos se comparan con soluciones de referencia obtenidas con el método clásico de elementos finitos en una escala.
Badillo, Almaraz Hiram. "Numerial modelling based on the multiscale homogenization theory. Application in composite materials and structures." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/83924.
Full textEn esta tesis se propone y desarrolla un método de homogeneización multi-dominio basado en una técnica en dos escalas. El método es capaz de analizar estructuras de materiales compuestos con varias distribuciones periódicas dentro de un mismo continuo mediante la partición de todo el dominio del material compuesto en subestructuras utilizando la teoría clásica de homogeneización a través de una formulación estándar de mecánica de medios continuos de primer orden. La necesidad de desarrollar este método multi-dominio surgió porque los métodos actuales de homogeneización se basan en el supuesto de que todo el dominio del material está representado por solo una distribución periódica o cuasi-periódica. Sin embargo, en algunos casos, la estructura puede estar formada por más de un tipo de distribución de dominio periódico. Los principios teóricos desarrollados en el método de homogeneización multi-dominio se aplicaron para ensamblar una herramienta computacional basada en dos problemas de valores de contorno anidados, los cuales son representados por un código de elementos finitos (FE) en dos escalas: a) una escala global, que trata el material compuesto como un material homogéneo. Esta escala se ocupa de las condiciones de contorno, las cargas aplicadas y los diferentes subdominios periódicos (o cuasi-periódicos) que puedan existir en el material compuesto; y b) una escala local, que obtiene la respuesta homogenizada de un volumen representativo o celda unitaria. Esta escala se ocupa de la geometría, y de la distribución espacial de los constituyentes del compuesto así como de sus propiedades constitutivas. El método se basa en la hipótesis de periodicidad local derivada de la periodicidad de la estructura interna del material. La implementación numérica de las restricciones de los desplazamientos y las fuerzas derivadas de la periodicidad se realizaron por medio del método de multiplicadores de Lagrange. La formulación incluye un método para calcular el tensor constitutivo tangente no-lineal homogeneizado una vez que el umbral de la no-linealidad de cualquiera de las celdas unitarias ha sido superado. El procedimiento se basa en llevar a cabo una derivación numérica aplicando una técnica de perturbación. El tensor constitutivo tangente se calcula para cada incremento de carga y para cada iteración del análisis una vez que la estructura ha entrado en el rango no-lineal. El método de perturbación se aplicó tanto en la escala global como en la local con el fin de analizar la efectividad del método en ambas escalas. Se lleva a cabo un proceso de paralelización en el método con el fin de acelerar el proceso de cómputo debido al enorme coste computacional que requiere la solución iterativa incremental anidada. Se investiga el efecto de ablandamiento por deformación en el material usando el método de homogeneización en dos escalas a través de un enfoque de fractura discreta. Se estudió la objetividad en el mallado dentro de la formulación clásica de FE en una escala y luego los conceptos expuestos se extrapolaron en el marco de la homogeneización de dos escalas. Se enfatiza la importancia de la longitud característica del elemento en un análisis multi-escala en el cálculo de la energía específica disipada cuando se produce el efecto de ablandamiento. Se presentan varios ejemplos para evaluar la propuesta computacional desarrollada en esta investigación. Se estudiaron diferentes configuraciones de compuestos que incluyen diferentes tipos de materiales, así como compuestos que presentan ablandamiento después de que el punto de fluencia del material se alcanza (usando daño y plasticidad) y compuestos con zonas que presentan altos gradientes de deformación. Los ejemplos se llevaron a cabo en materiales compuestos con uno y con varios dominios periódicos utilizando diferentes configuraciones de células unitarias. Los ejemplos se comparan con soluciones de referencia obtenidas con el método clásico de elementos finitos en una escala.
Samadiani, Emad. "Energy efficient thermal management of data centers via open multi-scale design." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/37218.
Full textCocle, Roger. "Combining the vortex-in-cell and parallel fast multipole methods for efficient domain decomposition simulations : DNS and LES approaches." Université catholique de Louvain, 2007. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-08172007-165806/.
Full textHileman, James Isaac. "Large-scale structures and noise generation in high-speed jets." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1078776079.
Full textTitle from first page of PDF file. Document formatted into pages; contains xxviii, 365 p.; also includes graphics. Includes bibliographical references (p. 269-279).
KUROIWA, TATIANA. "Application of modal decomposition and random decrement technique to ambient vibration measurement for detection of stiffness and damping change of a full-scale frame structure." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/124509.
Full textSamadi, Afshin. "Large Scale Solar Power Integration in Distribution Grids : PV Modelling, Voltage Support and Aggregation Studies." Doctoral thesis, KTH, Elektriska energisystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-154602.
Full textThe Doctoral Degrees issued upon completion of the programme are issued by Comillas Pontifical University, Delft University of Technology and KTH Royal Institute of Technology. The invested degrees are official in Spain, the Netherlands and Sweden, respectively. QC 20141028
Mestry, Siddharth D., Martha A. Centeno, Jose A. Faria, Purushothaman Damodaran, and Chen Chin-Sheng. "Branch and Price Solution Approach for Order Acceptance and Capacity Planning in Make-to-Order Operations." FIU Digital Commons, 2010. http://digitalcommons.fiu.edu/etd/145.
Full textXie, Biancun. "Modeling and simulation of silicon interposers for 3-d integrated systems." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53922.
Full textChodak, Jillian. "Pyrolysis and Hydrodynamics of Fluidized Bed Media." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32920.
Full textMaster of Science
Gacura, Matthew David. "Drivers of Fungal Community Composition and Function In Temperate Forests." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1543579763552776.
Full textButcher, Daniel S. A. "Influence of asymmetric valve timing strategy on in-cylinder flow of the internal combustion engine." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/23327.
Full textWang, Zhu. "Reduced-Order Modeling of Complex Engineering and Geophysical Flows: Analysis and Computations." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/27504.
Full textPh. D.
Carpier, Yann. "Contribution à l’analyse multi-échelles et multi-physiques du comportement mécanique de matériaux composites à matrice thermoplastique sous températures critiques." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMIR28/document.
Full textThe increasing use of thermoplastic-based composite materials in the aeronautical industry requires a better understanding of their mechanical behavior when exposed to radiant heat flux (consequence of a fire exposure). This study, which examines the thermo-mechanical behavior of quasi-isotropic woven laminates composed of PPS reinforced with carbon fibers, is divided into 3 parts. First, the thermal decomposition of the material and the evolution of its mechanical properties with temperature is studied. These data help to understand the behavior of these materials subjected to combined loads (radiant heat flux and tensile or compressive loadings). The last part aims to identify the material parameters necessary for thermo-mechanical simulation at macroscopic and mesoscopic scales
Lynch-Aird, Jeanne Elizabeth. "Estimation of post-mortem interval using decomposition scales for hanging bodies." Thesis, University of Central Lancashire, 2016. http://clok.uclan.ac.uk/16582/.
Full textMalek, Mohamed. "Extension de l'analyse multi-résolution aux images couleurs par transformées sur graphes." Thesis, Poitiers, 2015. http://www.theses.fr/2015POIT2304/document.
Full textIn our work, we studied the extension of the multi-resolution analysis for color images by using transforms on graphs. In this context, we deployed three different strategies of analysis. Our first approach consists of computing the graph of an image using the psychovisual information and analyzing it by using the spectral graph wavelet transform. We thus have defined a wavelet transform based on a graph with perceptual information by using the CIELab color distance. Results in image restoration highlight the interest of the appropriate use of color information. In the second strategy, we propose a novel recovery algorithm for image inpainting represented in the graph domain. Motivated by the efficiency of the wavelet regularization schemes and the success of the nonlocal means methods we construct an algorithm based on the recovery of information in the graph wavelet domain. At each step the damaged structure are estimated by computing the non local graph then we apply the graph wavelet regularization model using the SGWT coefficient. The results are very encouraging and highlight the use of the perceptual informations. In the last strategy, we propose a new approach of decomposition for signals defined on a complete graphs. This method is based on the exploitation of of the laplacian matrix proprieties of the complete graph. In the context of image processing, the use of the color distance is essential to identify the specificities of the color image. This approach opens new perspectives for an in-depth study of its behavior
Xie, Jianyong. "Electrical-thermal modeling and simulation for three-dimensional integrated systems." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50307.
Full textMalta, Edgard Borges. "Investigação experimental das vibrações induzidas pela emissão de vórtices em catenárias sujeitas a perfis de correnteza variável, ortogonais ao plano de lançamento." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-30012016-074321/.
Full textThe experimental investigation of Vortex-Induced Vibrations (VIV) on long catenary models and subjected to non-uniform velocity profiles, orthogonal to the catenarys plane, it is the main subject of this doctoral thesis. As a main goal, this work search to identify, describe and discuss the dynamic behaviors of VIV on catenary lines under non-uniform velocity profiles, comparing the results with those coming from the same phenomenon acting on flexible cylinders in a vertical configuration. Thus, it is intended to help for a more general understanding of VIV in offshore lines used in the oil and gas exploration at sea. In this context, much is known about the behavior of VIV on rigid cylinders elastically supported, as well as on flexible cylinders with no curvature, both configurations counting with a large literature describing not only the dynamic behaviors, but also their relationships with hydrodynamics aspects. However, in the case of long flexible cylinders, there are still more points to be understand, particularly at those conditions closer to the offshore operations - with catenary lines under variable current profile. Under those considerations, a rotating-arm was designed and assembled in the model basin at Numerical Offshore Tank (TPN), Brazil, for model tests under non-uniform current profile, featuring itself as an unpublished research on this topic. Different catenary geometries were tested in the rotating-arm at USP and also in the towing tank at Institute for Technological Research of the State of Sao Paulo (IPT), Brazil, all of them being compared with a vertical flexible cylinder. From those conditions of test, data was analyzed according to a technique of modal decomposition, so the motion results from all the models allowed the identication and the description of a dynamic behavior quite similar in the catenary when compared to that from a vertical cylinder, which has brought great understanding about the VIV on flexible lines. As an contribution, this work has provided to the TPN\'s model basin an interesting device for a wide variety of researchs on fluid- structural interaction - the rotating-arm.