Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 182 for “"polyhedral"”.
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Enumeration of polyhedral graphs
This thesis is concerned with the design of a polyhedron enumeration algorithm. The approach taken focuses on specic classes of polyhedra and their graph theoretic properties. This is then compared more broadly to other graph enumeration algorithms that are concerned with the same or a superset …
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Interactions between polyhedral permanent magnets
… the magnetic fields produced by generalised polyhedral permanent magnets, and the forces and torques between them. To achieve this aim, two main objectives were identified. The first objective was to analytically solve the magnetic charge model field equations for arbitrary polyhedral …
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Polyhedral Code Transformation for Julia
… as considering striding of array accesses. The polyhedral model of computation describes a series of operations and abstractions for manipulating code without violating dependencies or correctness, but is more aggressive than typical compiler optimizations. This paper describes the process of …
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The Polyhedral Geometry of Graphical Designs
A graphical design is a quadrature rule for a graph. That is, a graphical design is a subset of graph vertices for which the global averages of certain Laplacian eigenvectors are equal to weighted averages of these vectors over the design subset. This definition was inspired by classical quadrature …
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Local Criteria in Polyhedral Minimizing Problems
This thesis will discuss two polyhedral minimizing problems and the necessary local criteria we find any such minimizers must have. We will also briefly discuss an extension of a third minimizing problem to higher dimension. The first result we present classifies the three-dimensional piecewise …
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Enhancing Polyhedral Relaxations for Global Optimization
… preprocessing to facilitate the construction of polyhedral relaxations for global optimization. We design and implement an automatic convexity detection algorithm to exploit the convexity properties of general nonlinear programming problems.
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Edge-unfolding almost-flat convex polyhedral terrains
… specifically on edge-unfoldability of convex polyhedral terrain which are "almost at" in that they have very small height. We demonstrate how to determine whether cut-trees of such almost-at terrains unfold and prove that, in this context, any partial cut-tree which unfolds without overlap and …
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Polyhedral aspects of cardinality constrained combinatorial optimization problems
Diese Dissertation befasst sich mit polyedrischen Strukturen von kardinalitätsbeschränkten kombinatorischen Optimierungsproblemen. Aus einem kombinatorischen Optimierungsproblem erhält man ein kardinalitätsbeschränktes kombinatorisches Optimierungsproblem, indem man nur solche Lösungen erlaubt, …
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Polyhedral Computation for Differential System Analysis and Control
… novel characterisation of the subdifferential of polyhedral functions in one of the representations that leads to novel dissipativity conditions for bounding the L1 gain of systems. Differential analysis is used throughout to link the conditions on the polyhedra to the resulting system behaviour. …
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Simplifying multiple-statement reductions with the polyhedral model
… vision, and financial analytics. Contemporary polyhedral-based techniques make it possible to optimize reductions, such as prefix sum, in which each component of reduction's output potentially shares computation with another component in the reduction. Therefore an optimizing compiler can …
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Atomistic simulations of octacyclopentyl polyhedral oligomeric silsesquioxane polyethylene nanocomposites
… Nanoscopic fillers such as carbon nanotubes, polyhedral oligomeric silsesquioxane (POSS), and layered silicates have already been successfully used to improve the thermal and mechanical properties of polymers. On this length scale, details describing particle organization, interaction between …
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Synthesis towards Polyhedral and Rigid Organic Non-Linear Optic Materials
… computational research has shown that both polyhedral carborane compounds and sterically constrained hydrindacene show great potential as NLO compounds. Their calculated values exceed those of compounds currently in use. Initial synthetic obstacles in the formation of polyhedral carborane …
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Developments in large scale discrete element simulations with polyhedral particles
… discrete element simulations with realistic polyhedral particle modeling, aiming to provide a better insight into the underlying mechanisms of the granular materials and enhance the predictive capabilities for engineering applications. In this dissertation, the research effort is made in two …
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Interpreting images of polyhedral objects in the presence of uncertainty
… are related to the interpretation of images of polyhedral objects with a special emphasis on the effects of uncertainty. Its contributions span three areas: we first present an approach to the recovery of 3D shape from a single image using line-drawing analysis and complex reflectance models. …
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Shared memory parallelization for large scale 3D polyhedral particle simulations
… In this study, novel parallel algorithms for polyhedral particle simulations were developed and implemented to reduce the computational cost. The parallelization study showed that the code achieved approximately 30 times speed-up with 48 cores on a LINUX machine. With this parallelized …
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Thermomechanical properties of polyhedral oligomeric silsequioxane- poly(methyl methacrylate) nanocomposites
Poly(methyl methacrylate)s (PMMA) containing polyhedral oligomeric silsesquioxane (POSS) nanoparticles (d [approx.] 1.5 nm) were subjected to heological, mechanical, and morphological tests to determine the effects that POSS has on the melt-state and solid-state properties of this commercially …
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Polyhedral structure of the product cycling problem with changeover costs
Thesis (Ph. D.)--Massachusetts Institute of Technology, Sloan School of Management, 1990.
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Synthesis and Characterization of Polyhedral Oligomeric Silsesquioxane (POSS) Based Amphiphiles
Polyhedral oligomeric silsesquioxanes (POSS) have attracted substantial academic interest for many years as hybrid materials and nanofillers for controlling thermal and mechanical properties, and providing thermal and chemical resistance while retaining ease of processing. A natural extension of …
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