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 36 for “"empirical modeling"”.
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Mechanistic-Empirical Modeling of Permanent Deformation in Asphalt Concrete Layers
Three mechanistic-empirical permanent deformation models were evaluated under Swedish conditions with respect to traffic, climate and materials using accelerated pavement testing and long-term pavement performance studies. The mechanistic-empirical pavement design guide (M E PDG), the …
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Empirical Modeling Of A Marijuana Expectancy Memory Network In Children As A Function Of Age And Marijuana Use
The present investigation modeled the expectancy memory organization and likely memory activation patterns of marijuana expectancies of children across age and marijuana use. The first phase of the study surveyed 142 children to obtain their first associate to marijuana use. From their responses, …
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Experimental Evaluation and Semi-Empirical Modeling of the Tractive Performance of Rigid and Flexible Wheels on Lunar Soil Simulant
Understanding the effects of various wheel parameters on tractive performance is not completely understood. In order to properly quantify the individual effects of wheel parameters on the mobility of rigid and flexible wheels in soft soil, tests were performed, in cooperation with NASA Glenn …
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Empirical modeling of the dynamics of the order of entry effect on market share, trial penetration and repeat purchases for frequently purchased consumer goods
Thesis (Ph. D.)--Massachusetts Institute of Technology, Sloan School of Management, 1989.
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Characterization of Oscillatory Lift in MFC Airfoils
… components from oscillating airfoil. Finally, empirical wind tunnel data is modeled and used to simulate the deflection of airfoil surfaces during dynamic testing conditions. This research serves to combine modal analysis, empirical modeling, and aerodynamic testing of MFC driven, oscillating …
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Constitutive Modeling of Friction in Bolted Connections
… is unknown and poses a significant challenge to modeling the nonlinear vibration of assemblies. This thesis applies empirical and physics-based modeling approaches to identify improvements to current models and a potential path towards predictive models of friction in bolted joints. The empirical …
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Effects of the geometric modifications on the shear layer excitation source in co-axial side branches
… of the sound source model as a reliable semi-empirical modeling methodology. The focus is on how the downstream acoustic boundary conditions, when varied, markedly alter the acoustic field and the aeroacoustic sound source within deep co-axial cavities. Furthermore, it highlights how different …
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Intrametropolitan firm clustering : measurement, detection and determinants : case study in Boston
… suburbanization and makes a solid step towards empirical modeling and understanding of them at the micro-level. As demonstrated in this thesis, clustering of firms or employments both end up with significant concentration of employment at some spots with specific attributes. This enables …
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A Statistical Approach to Empirical Macroeconomic Modeling with Practical Applications
Most of empirical modeling involves the use of Ordinary Least Squares regression where the residuals are assumed normal, independent, and identically distributed. In finite samples, these assumptions becomes critical for accurate estimations, however, in macroeconomics in particular, these …
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Low Carbon n-GaN Drift Layers for Vertical Power Electronic Devices
… and trimethylgallium (TMGa) flow. Through guided empirical modeling, it was demonstrated that the carbon incorporation in GaN growth could be predicted using a single parameter based on the ratio of ammonia flow to the growth rate. This model accurately predicts carbon concentrations ranging from …
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Analysis of Airport Security Screening Checkpoints using Queuing Networks and Discrete Event Simulation: A Theoretical and Empirical Approach
… model using Arena version 12 was utilized for an empirical approach. Data was collected from both literature and by manual collection methods. Manual data was collected during the peak operating time of 6am-7am local time at the airport being modeled. The simulation model was verified and …
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A new approach to fitting linear models in high dimensional spaces
… reviewed and compared, both theoretically and empirically, with the new methods. Estimating a mixing distribution is an indispensable part of pace regression. A measure-based minimum distance approach, including probability measures and nonnegative measures, is proposed, and strongly consistent …
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Longitudinal multilevel models analyzing the trends of land use effects on non-driving travel choice
… attempts to establish and compare three distinct modeling approaches to analyze the trends of land use effects on people’s choice behavior of non-driving travel mode. The three modeling approaches are: a comparison approach with two cross-sectional multilevel Logit models using single-year data, a …
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Modal split analysis for the journey to work
… choice is difficult to construct. Nevertheless, empirical modeling of modal choice behaviour has enabled transportation planners to predict future travel demands for different modes. Furthermore, such models have led to a body of knowledge which has allowed researchers to explore the modal choice …
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Nonlinear Sliding Mode Observer Applied to Microalgae Growth
<p>Modeling biological processes, such as algae growth, is an area of ongoing research. The ability to understand the multitude of parameters that influence this system provides a platform for better understanding the dynamics of microalgae growth. Empirical modeling efforts look to understand …
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Analysis of DRIE uniformity for microelectromechanical systems
… have focused on experimental evidence and modeling of feature level (aspect ratio) dependencies. This thesis contributes a computationally efficient and effective modeling approach which focuses on layout pattern density-induced nonuniformity in DRIE. This is a key component in an …
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Reduced-order modeling of granular intrusions driven by continuum approaches
… metals) and fluids (like water). This makes modeling granular media challenging. While the field of granular physics extensively uses grain-scale Discrete Elements Modeling (DEM) to model such characteristics of granular systems, they are computationally expensive. On the other hand, …
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Whose Choice Is It Really?: The Impact of Property Profitability, Owner Strategies, & Perceived Majority Tenant Prejudices on Housing Choice Voucher Acceptance
… to accept voucher tenants in two key ways: empirical modeling of voucher acceptance using a national sample of rental properties; and qualitative studies of landlords within a single market area. This research has implications for improving the future performance of the voucher program and …
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Evaluating the Potential for Estimating Age of Even-aged Loblolly Pine Stands Using Active and Passive Remote Sensing Data
Data from an airborne laser scanner, a dual-band interferometric synthetic aperture radar (DBInSAR), and Landsat were evaluated for estimating ages of even-aged loblolly pine stands in Appomattox-Buckingham State Forest, Virginia, U.S.A. The DBInSAR data were acquired using the GeoSAR sensor in …
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