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 24 for “"averaging method"”.
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Mathematical Analysis of Upscaling Well Log Data from Sonic to Seismic Resolution
… seismic observations. Various upscaling methods have been published and discussed, such as the Simple Averaging method, the Backus Averaging method, the Pair Correlation Function “PCF” method, the General Singular Approximation “GSA” method, and the Markov Chain Monte Carlo “MCMC” method. …
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Vibrational Control of a Cantilever Beam Using Sensor and Actuator Averaging Methods
… are derived. We go over sensor and actuator averaging, a method to create a spatial filter that is insensitive to model parameter uncertainty. We develop a controller to actively control cantilever beam vibration using accelerometer input. The controller is a classic single-sensor …
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Separation of tread-pattern noise in tire-pavement interaction noise
… rotation. Hence, the order domain synchronous averaging method is used in this study to separate and quantify the tread pattern contribution to the total tire-pavement interaction noise. The experiment has been carried out using an On-Board-Sound-Intensity (OBSI) system. Five tires were tested …
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Internal Fluid Dynamics and Frequency Characteristics of Feedback-Free Fluidic Oscillators
… (PIV) technique with the help of a PIV phase averaging method and a new sensor setup for simultaneous frequency measurements in refractive index matching fluid. Three different operating regimes (low flow rate, transition and high flow rate regions) and the fluid dynamics of the oscillating …
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Bayesian Methodology for Missing Data, Model Selection and Hierarchical Spatial Models with Application to Ecological Data
… the benthic health of Ohio's waterways. A new method for incorporating covariate structure and missing data mechanisms into missing data analysis is considered. This method allows us to detect relationships other popular methods do not allow. We then further extend this method into model …
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Extended describing function method for small-signal modeling of resonant and multi-resonant converters
The extended describing function method is proposed as a systematic small-signal modeling approach to nonlinear switching circuits. This method offers significant simplification upon the previous work on using the multi-variable describing functions to treat the circuit nonlinearities. As an …
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The competitive dynamics of two Protea shrubs growing in a mixed fynbos stand
… as a cause of these patterns. Two different methods were used for measuring competition in a mixed stand of P. lepidocarpodendron and P. corona/a growing on the Cape Peninsula. These were the plot-based averaging method, which considers stand density, and the nearest neighbour approach, which …
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TDDFT calculations for excitation spectra of solids and superstructures utilizing mGGA
… We adopted the TDDFT theory and the cluster averaging method to compute the spectra of III-V ternary alloys with arbitrary concentration x. We find great agreement between theoretical and experimental data. The success of this method is mainly because that we approximate the transition matrix …
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Precision Lattice Calculation of Kaon Decays with Möbius Domain Wall Fermions
… such as the eigCG algorithm and the all mode averaging method, we perform a direct, precise lattice calculation of the semileptonic kaon decay K→πlν using these newly generated high quality lattice ensembles. Our main result is the form factor f^±{Kπ}(q²) evaluated directly at zero momentum …
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Numerical Investigation of Hydrate-bearing Sediment Formation Heterogeneity during Methane Gas Recovery
… a model that adopts the conventional parameter averaging method provide results equivalent to the results of the layered model. Based on the research findings above, the 2013 Nankai Trough trial was reanalyzed. Results show that the updated model considering soil and hydrate heterogeneity gave …
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An experimental study of turbulent vortex rings using particle image velocimetry
… features are successfully captured. An azimuthal-averaging method is also developed in an attempt to estimate the turbulence quantities in cylindrical coordinates. However, because of various limitations, the three-dimensional reconstruction method is not perfect, and room for future improvement …
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Design and Analysis of Switching Circuits for Energy Harvesting in Piezostrutures
This study deals with a general method for the analysis of a semi-active control technique for a fast-shunt switching system. The benefit of the semi-active system is the reduction in power consumption, which is a significant disadvantage of a fully active system compared with a passive system. A …
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An analysis of reconnection dynamics in an eruptive flare model
… that form during solar flares. The model uses a method developed by B. V. Somov & V. S. Titov for Petschek-type reconnection. The first part of this dissertation provides a detailed analysis of the Somov-Titov model, its assumptions, strengths and weaknesses. We consider the role of both the …
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Bayesian model averaging on hydraulic conductivity estimation and groundwater head prediction
… of data, the inflexibility of parameterization methods, and non-uniqueness of parameterization methods. Groundwater predictions are greatly affected by multiple interpretations of aquifer properties and the uncertainties of model parameters. This study introduces a Bayesian model averaging (BMA) …
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B=4N Nuclei in the Skyrme Model
… via electron scattering. We develop a classical averaging method to calculate the Patterson function and the form factor for a B = 4N nucleus and make comparisons with experimental data. We also discover a way of using the baryon density directly to approximate the locations of zeroes and …
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Consistent anticipatory route guidance
… of the RGG solution process. Numerical methods for fixed point computation were examined, focusing on approaches that are rigorous and applicable to large-scale problems. Methods included Gibbs sampling for highly stochastic maps; generalizations of functional iteration for deterministic …
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Growth release of trees following fine-scale canopy disturbances in old-growth forests of coastal British Columbia, Canada
… As a first step, I calibrated the radial-growth averaging method to account for regional-scale variability and capture a more complete range of growth releases that may occur following the formation of fine-scale gaps in the study stands. A 25% threshold, 5-year moving average, and 10-year window …
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Methods for convex optimization and statistical learning
… contributions at the interface of first-order methods for convex optimization and problems in statistical machine learning. In the first part of this thesis, we present new results for the Frank-Wolfe method, with a particular focus on: (i) novel computational guarantees that apply for any …
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Studies in the theory of solids
"I: The accuracy of a recently proposed method of extracting kinematic low-energy-electron-diffraction intensities from averages of experimental data taken at constant momentum transfer is examined by using calculated intensities in lieu of the data. These ""dynamical"" intensities are evaluated …
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Bidirectional DC-DC Power Converter Design Optimization, Modeling and Control
… an inductance and snubber capacitor optimization methodology. The inductor volume index and the inductor valley current are suggested as the optimization method for small volume and the realization of ZVRT. The proposed capacitance optimization method is based on a series of experiments for …
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