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.
Results
Showing 1 to 20 of 92 for “"numerical implementation"”.
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A visco-plastic constitutive model for snow. Theoretical basis and numerical implementation
L'abstract è presente nell'allegato / the abstract is in the attachment
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Coupled Elastic-Plastic Thermomechanically Assisted Diffusion: Theory Development, Numerical Implementation, and Application
… and finite element code. Potential uses of the numerical implementation of the theory are demonstrated using two problems. Specifically, tritium diffusion in a titanium alloy and hydrogen diffusion in a multiphase stainless steel are examined.
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On a class of strain gradient plasticity theories : formulation and numerical implementation
… The following four theories were developed and numerically implemented: * A one-dimensional theory to understand the basic nature of strain gradient theories; * A small deformation crystal plasticity theory; * A small deformation theory for isotropic viscoplastic materials; and, * A large …
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Orbital Dependent Functionals: An Atom Projector Augmented Wave Method Implementation
This thesis explores the formulation and numerical implementation of orbital dependent exchange-correlation functionals within
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A comprehensive view of Markov-Functional models and their application
… from the theoretical framework down to the numerical implementation of the specific models. This involves explaining the framework for Markov-Functional models, describing specific models, obtaining a deeper understanding of how the model parameters affect the results, discussing the issues …
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Techniques for analyzing planar, periodic, frequency selective surface systems
… the tools that will enable him to properly use a numerical implementation of the FSS analysis."
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Axial segregation of granular flows in rotating drums
… limit for all boundary conditions investigated. Numerical implementation of the axial diffusion model is shown to be sensitive to the boundary conditions of the tumbling mill (particle size, volume concentration, mill speed, average friction, end wall friction, drum length and drum diameter). The …
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Modeling of melt pool thermal behavior in laser material
… free surface tracking method associated with the numerical implementation scheme is proposed. The dissertation investigates the melt pool evolution process and analyzes the effects from laser properties and different process conditions"--Abstract page iv.
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Comportamento não-linear de estruturas de concreto armado com aplicação a análise de vasos de pressão de usinas nucleares
The formulation and numerical implementation of a concrete model that has been incorporated in the computer program LORANE-NL has been presented. The material model is a hypoelastic model based on a nonlinear uniaxial stress-strain relation that is generalized to take account biaxial and triaxial …
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The impact of inhomogeneity on the analysis of cosmological data
… data for the Lemaˆıtre model, on which a numerical implementation can be based. In our numerical execution of the algorithm we have shown that there are some regions which need special treatment : the origin and the maximum in the diameter distance. We have coded a set of MATLAB programs …
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Continuum and crystal strain gradient plasticity with energetic and dissipative length scales
… Misro-scale experimental observations, and Numerical methods. Since conventional continuum plasticity and heat transfer theories, based on the local thermodynamic equilibrium, do not account for the microstructural characteristics of materials, they cannot be used to adequately address the …
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Surfactant instabilities on thin films
… on the spreding behavior. Finally, we present a numerical implementation of a mathematical model which is capable of reproducing the experimentally observed trends.
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Modeling of nearshore hydrodynamics for sediment transport calculations
… equations for the unsteady case and detail their numerical implementation. This unsteady model is applied to study the effect of a wave beat normally incident on a plane sloping beach. We use this case to illustrate the relevance of the unsteady generalization to sediment transport calculations.
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Incorporating the Pre-symptomatic Stage in the Discrete-Time Kermack-McKendrick Model
… but there is a disadvantage where the numerical implementation is too much. Here, the pre-symptomatic stage was further included in the recent discrete-time SEIR KM27 Model formulated in Diekmann (2021). With discrete-time models being general, flexible when including public health …
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Numerical solution and spectrum of boundary-domain integral equations
A numerical implementation of the direct Boundary-Domain Integral Equation (BDIE)/ Boundary-Domain Integro-Differential Equations (BDIDEs) and Localized Boundary-Domain Integral Equation (LBDIE)/Localized Boundary-Domain Integro-Differential Equations (LBDIDEs) related to the Neumann and Dirichlet …
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Formalism for the rapid evolution of primordial black holes
… formalism are investigated, details regarding a numerical implementation of our code are discussed, and a proof of concept example is presented.
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The effects of inelastic self-interacting dark matter on galactic halo properties v/
… between particles. Using the results of a numerical implementation in the AREPO code, the effects of two-state inelastic dark matter on the density profiles, velocity dispersions, pseudo-phase-space density profiles, orbital anisotropy parameter profiles, and principal axis ratios of …
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Free form finding of grid shell structures
… structural performance. This thesis presents a numerical implementation that finds 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, …
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Modeling of Hysteretic Behavior of Beam -Column Connections Based on Self -Learning Simulation
… tearing of connecting elements. Moreover, its numerical implementation is more efficient than the conventional models since it does not need an interaction equation and a plastic potential. A new approach based on a self-learning simulation algorithm is used to characterize the hysteretic …
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Evaluation of a Fractional Theis Equation
… based on non- integer order derivatives and its numerical implementation developed by Cloot and Botha. However, their equation was found faulty and a new robust derivation of a fractional Theis solution developed by Baeumer et al. (2009) is presented. The new fractional Theis equation solution …
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