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 116 for “"surface model"”.
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A response surface model of the air quality impacts of aviation
… Within APMT, there is a desire for faster models that can analyze multiple policy scenarios for decades into the future in order to inform policy decisions on a reasonable time scale. One particular need is that for a fast surrogate air quality model that relates changes in aviation …
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Reverse Engineering of Aircraft Wing Data Using a Partial Differential Equation Surface Model
… process are data acquisition, data separation, surface or curve fitting, and CAD/CAM production. The surface fitting step determines the design representation of the object, and thus is critical to the success or failure of the reverse engineering process. Although surface fitting methods …
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A Fractal Surface Model for Multi-Component Trim: Applications to Boron-Carbon Materials
Made available in DSpace on 2017-07-06T18:56:18Z (GMT). No. of bitstreams: 3 Shaheen_Mohammad_A_MS.pdf: 69106845 bytes, checksum: aad990c3541ed3c23a7f82a1da5953cc (MD5) Shaheen_Mohammad_A_MS_ABS.pdf: 609449 bytes, checksum: b42b81c22582d72b2618813e145223bf (MD5) license.txt: 4813 bytes, checksum: …
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Enhanced Anisotropic Bounding Surface Model: Implementation and Simulation of Excavation in Soft Cohesive Soils
… application of an enhanced anisotropic bounding surface model with non-associative flow rule, based on the anisotropic critical state theory and bounding surface plasticity. The model has exhibited a great potential to realistically simulate the mechanical behavior of cohesive soils, in …
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Estimation of the global carbon fluxes due to agricultural management activities using a land surface model (ISAM)
… the agriculture sector. This study uses a land surface model with spatially heterogeneous representations of agricultural land management practices to estimate the carbon dynamics induced by agricultural land management practices (i.e., planting crops, fertilization, irrigation, harvesting, and …
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A Cost Surface Model For Preliminary Evaluation of Selected Physical Factors Associated With Residential Site Development in South Central Greene County, Missouri
… A geographic information systems was used to model costs related to the selected physical factors in a study area in southern Greene County, Missouri. The output of this model was a cost-surface map in which peaks depicted areas with his associated development costs and valleys showed areas …
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Impacts of model-data uncertainties on biogeophysical-biogeochemical interactions in a land surface model (with an emphasis on the northern high-latitude regions)
… investigated the impacts of current model-data uncertainties on biogeophysical-biogeochemical interactions in a terrestrial modeling framework. To achieve this objective, I applied a land surface model, specifically the Integrated Science Assessment Model (ISAM), at spatial scales …
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A new technique for 3D modeling of water surfaces using a Geiger mode receiver
… and quickly (i.e in real time) create a digital surface model of a water surface using bathymetric lidar when presented with water turbidity. Accurate and consistent modeling of the water surface is required in order to correct for the surface’s volatility when imaging the sea floor. However, …
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Design optimization of aerodynamic drag at the rear of generic passenger cars using nurbs representation
… the rear body of a generic passenger car model (the Ahmed Body) and the NURBS parameters were employed for geometry parameterization. These geometry parameters were systematically modified using design of experiments to obtain different geometries of the simplified car model. The …
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Variable-Complexity Response Surface Approximations For Wing Structural Weight in HSCT Design
… Civil Transport (HSCT) is presented. Response surface methodology is used to fit a quadratic polynomial to data gathered from a series of structural optimizations. Several techniques are employed in order to minimize the number of required structural optimizations and to maintain accuracy. …
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Variable-Complexity Approximations for Aerodynamic Parameters in Hsct Optimization
… and performance design is presented. Response surface model methodology is used to fit quadratic polynomials to data gathered from a series of numerical analyses of different HSCT designs. Several techniques are employed to minimize the number of required analyses and to maintain accuracy. …
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Development of Approximations for HSCT Wing Bending Material Weight using Response Surface Methodology
… on HSCT configuration parameters. A response surface methodology is used to fit a quadratic polynomial to data gathered from a large number of structural optimizations. To reduce the time of performing a large number of structural optimizations, coarse-grained parallelization with a …
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Surface Reaction Mechanisms in Plasma Etching Processes
Surface reactions occurring in fluorocarbon plasmas also influence plasma properties by consuming or generating plasma fluxes. Of particular interest is the effect that surfaces have on CF2 densities, as CF2 is a precursor for polymer formation. These processes were investigated with the integrated …
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Quality improvement and control based on defect reduction
… Improve, and Control (DMAIC), and Response Surface Model were introduced to reduce the defect rate and control the process. As a result, critical inputs were identified, and a statistical regression model was constructed to predict the flaw size by knowing the critical inputs of the process. …
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Snow Hydrology and Streamflow Response to Snowmelt: A Case Study on SWE Dataset Comparisons, Regional Water Balance, and Snowmelt-Induced Runoff within the Smith River Watershed, Montana
… WUS-SR, SNODAS, and Noah-MP via WLDAS) and SnowModel were validated against observations from five Snow Telemetry (SNOTEL) stations using correlation (r), mean absolute error (MAE), and root mean square error (RMSE). Models assimilating SNOTEL data (SNODAS, UA 800m, and UA 4km) performed best. …
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Estimating Soil Moisture and Energy Fluxes Using Assimilation of Remotely Sensed Land Surface State Variables
… interactions. Given the approximate model physics representation in the land surface models predicting these fluxes, better predictions can be obtained by assimilating hydrologically relevant remotely sensed data into the predictive models. We consider two approaches. In the first …
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Soil moisture dynamics from satellite observations, land surface modeling, and field data
… The simple physical soil moisture dynamics model was identified as an alternative approach to characterize statistical soil moisture variability. The soil moisture variability was strongly related to physical properties including rainfall and topography.</p><p>Normal and log-normal …
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An Investigation on the Effect of Ground Plane Roughness on Antenna Radiation Characteristics
… a flat ground plane and a randomly-varying rough surface. The Method of Moments with the Electric Field Integral Equation (EFIE) is used to account for all coupling interactions. Monte Carlo averaging is used to compute results over multiple rough surface realizations, which follow the …
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Modelling surface evolution coupled with tectonics
This study presents the development of 1D and 2D Surface Evolution Codes (SECs) and their coupling to any lithospheric-scale (thermo-)mechanical code with a quadrilateral structured surface mesh. Both SECs involve diffusion as approach for hillslope processes and the stream power law to reflect …
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Modelling the effect of recent stress history on the deformation of overconsolidated soils
… foundations, and to develop a constitutive soil model that can predict such behaviour. The principal feature of soil behaviour investigated was the effect of recent stress history, defined by 9 the angle of rotation between the previous and current stress path directions. Stress path triaxial …
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