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 9 of 9 for “"X-ray scanning"”.
-
Area Based Fan Beam Projection Model for Computed Tomography
… usually referred to as projection data, from x-ray scanning. This projection data is often modeled using line integrals, but x-rays are of finite width in reality, so the accuracy of the projection data can be improved if an area based approach is used instead. In addition emitter beam shapes …
-
Corrosion and electrochemical behavior of Indium and Indium-Bismuth alloys in hydrochloric acid
… corrosion of In-Bi alloys was studied using X-ray, scanning electron microscopy, atomic absorption spectroscopy, and cyclic voltammetry techniques.</p> <p>Calculated activation energy values indicated that the corrosion of In-Bi alloys was activation controlled. The effect of amine mixtures on …
-
Long wavelength X-ray microanalysis
… light element characteristic wavelengths in an x-ray scanning microanalyser. For long wavelength microanalysis purposes, the classica1 methods of x-ray spectrometr.v are impracticable. The proportional counter, the best of several possibilities, has there~ore been employed as a dispersive …
-
Improving Object Classification in X-ray Luggage Inspection
X-ray detection methods have increasingly been used as an effective means for the automatic detection of explosives. While a number of devices are now commercially available, most of these technologies are not yet mature. The purpose of this research has been to investigate methods for using x-ray …
-
Simulation of X-ray imaging systems for luggage inspection
This thesis describes XL, an x-ray imaging simulator for luggage inspection. This software system runs on a workstation and models x-ray sources, x-ray detectors and objects between them. A simple graphical interface permits the user to specify simulation parameters and inputs. XL then uses Monte …
-
Improving capabilities of pore-scale modeling of multiphase flow for geological storage of CO2
… simulation on real rock geometry measured by X-ray micro-CT scans, as well as pore-network (PN) models which simplify the pore space into interconnected idealized shapes. Both approaches are challenged in applications to large heterogeneous cores. A heterogeneous Mt. Simon sandstone sample is …
-
Tree-ring analysis and stem biomass estimation of limba (Terminalia superba Engl. & Diels) in the framework of sustainable forest management
… sample trees, using state-of-the-art helical X-ray scanning. Combining annual tree-ring data and pith-to-bark wood density profiles enables the extraction of annual wood densities. Wood density increases from pith to bark and allows for detailed estimates of carbon stocks over time using …
-
Two-dimensional Mapping of Interface Thermal Resistance by Transient Thermal Impedance Measurement
… the sintered silver layer were investigated by scanning electron microscope (SEM) and X-ray scanning, to construct a thermal model for FEA simulation. The simulation results showed good agreement with the measured Zth result, which verified the accuracy of the test setup. The sensitivity of …