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 19 of 19 for “"density method"”.
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Energy density method and its applications to defect energies
We propose a method to study various defects using an energy density formulation in density functional theory. Unlike traditional total energy methods that find a single energy as the difference between two calculations, this approach can provide the formation energies for more than one point …
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Dislocation core energies and magnetic exchange interactions from first-principles energy density method
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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Structural grid shell design with Islamic pattern topologies
… Form finding is conducted via the force density method, which is augmented with the addition of a force density optimization loop to enable grid shell height selection. A further modification allows for force densities to be scaled according to the initial member lengths, introducing …
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Topology optimisation for fluid flow and heat transfer applications
… to determine the merits and drawbacks of each method, extend the most suitable method to consider multi-material structures and to subsequently apply this method to design heat recovery structures subject to fluid convection. The two optimisation methods assessed were the density method and the …
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Mixed Isogeometric Form Finding Of Lightweight Structures
… work the attention has been given on the Force Density Method and the Updated Reference Strategy applied to cables and membranes. These methods have been examined by means of numerous applications highlighting their main limit that is the lack of a robust variational setting and consequently a …
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Machine learning applications for core guided petrophysical analysis
… interpretation. In this thesis, I present two methods for gas hydrate saturation estimation using well log and core data, namely the resistivity method, and the nuclear magnetic resonance (NMR) - density method. Then, I show the discrepancy between the two models to highlight the data quality …
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Free form finding of grid shell structures
… the funicular form of grid shell structures. Two methods are implemented for the form finding: the potential energy method (PEM) and the force density method (FDM). The PEM, inspired by the 3D hanging chain model, find the funicular form by minimization of the total potential energy. On the other …
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Active control of tensegrity structures and its applications using Linear Quadratic Regulator algorithms
… of these structures is given along with the methods which are used to find their form. Next, the different methods which have been previously used to achieve active control in tensegrity are reviewed as well as the objectives they intended to achieve. From there, the Linear Quadratic …
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Site characterization using drone based photogrammetry
… This research highlights an improved contour density-based methodology drawing upon existing methods of structural domain identification to locally divide the rock mass into domains of similar structural orientation. Equal angle stereographic comparisons between domains are considered …
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Form-finding structures
… optimization must be done through formfinding methods, whereby the structure itself defines its own shape based on its figure of equilibrium under applied loads. Unlike free forms which are defined mathematically, form-finding shapes rely on the structure and loads themselves for definition. …
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A novel state-space based method for direct numerical simulation of particle-laden turbulent flows
We developed a novel state-space-based numerical method for evolution of the particle density function, that describes particle-laden flows. The problem is stated purely in a deterministic Eulerian framework. The method is coupled to an incompressible three-dimensional Navier-Stokes solver. We …
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Synthesis of ion microbeam column.
… are developed to complement the charge-density method in analyzing the new column structures. Various optimization schemes are combined to avoid shallow minima at a reasonable computational cost. With each plate partitioned into four sectors, we show that the interactions between the …
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Detecting climate change and its impacts on crop yield in the continental United States
… In this thesis, a novel change point detection method, Bayesian local posterior density method in windows weighted by Pettitt test, is developed to detect unknown multiple change points in a given time series, and to classify change patterns based on the final posterior probability density. The …
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Locating senior walking frame users in crowded indoor environments
… This thesis presents two novel localization methods that make use of these simplifying constraints and provides an industry strength implementation of one of these strategies. The first method described is an image based place recognition technique that employs the Bag of Words model for …
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Heat dissipation from carbon nano-electronics
… SiO2 (a-SiO2) substrate. First, the theoretical methodologies and concepts used in our simulations are presented. In particular, two concepts are described in detail as they are necessary for the understanding of the subsequent chapters. The first is the linear response Green-Kubo (GK) theory of …
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Studies of premixed turbulent flames under flamelet assumptions
… flame by the 2D laser diagnostic. A number density method was defined to detect flame edges from particle Mie scattering images so that a high-speed PIV system could provide both velocity field and instantaneous flame edges with an acceptable uncertainty. By that, turbulent flux and …
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The effectiveness of a percussion drill method for making concrete cube samples to assess the characteristics of precast zero-slump concrete
… of the specimens results in variation in the density and compressive strength results. Therefore, there is a need for a simple, standardised quality control method that considers the compaction achieved by precast machines. A suitable procedure was pursued with the following specific …
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Influence of process parameters and manufacturing defects on the properties of thermoplastic composite pipes.
… ether ketone (PEEK), Polyamide 12 and high density polyethylene (HDPE) are the matrix. Current techniques such as the filament winding and automated tape laying or placement used in the industry are facing challenges with on-the-spot detection in a continuous manufacturing system. In TCP …
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System Reliability-Based Design and Multiresolution Topology Optimization
Structural optimization methods have been developed and applied to a variety of engineering practices. This study aims to overcome technical challenges in applying design and topology optimization techniques to large-scale structural systems with uncertainties. The specific goals of this …