Engineering Commons^™

Improvements In A Hybrid Stochastic/Deterministic Method For Transient Three-Dimensional Neutron Transport, Charles L. Bentley

Doctoral Dissertations

This research develops an improved methodology (and corresponding code) for solving the time-dependent, three-dimensional Boltzmann Transport Equation with explicit representation of delayed neutrons. These improvements are incorporated in a modified version of the code TDKENO, entitled TDKENO-M. Specifically, these improvements are:

1. Incorporate the improved quasistatic methodology into an existing quasistatic framework. Specifically, include the flux shape derivative in the fixed source term instead of being neglected. Also, compute the point kinetics parameters deterministically by their inner product definitions.

2. Incorporate a hierarchy of three different integration time intervals for the numerical solution of the coupled set of ordinary differential …

Impacts Of Hypothetical NoX Sources On Ozone Formation In East Tennessee, Mamun Ahmed

Masters Theses

This thesis studied the effects of hypothetical NO_x sources located in East Tennessee on the tropospheric ozone concentrations impacting the Great Smoky Mountains National Park (GSMNP) using the Urban Airshed Model (UAM). The product of this study is a technique of assessing the potential impact of a new or modified large NO_x source on ozone concentrations within a Class I area, which includes and up-to-date detailed emissions inventory. The East Tennessee Modeling Domain (ETMD) consists of 94 counties in six different states with an area of 75,900 km²: Tennessee (40), North Carolina (22), South Carolina (8), …

The Effect Of University Characteristics On The Bicycle Transportation Mode And Helmet Usage, Carlton C. Urban

Masters Theses

By performing a statistical analysis on data collected from the Internet, this study sought to determine if designated characteristics of a university actually affect the bicycle transportation mode and helmet usage on college campuses. The focus group for this research experience involved bicycle commuters affiliated with universities in the United States. Through the establishment of a World Wide Web home page and on-line survey, the author obtained data concerning estimated bicycle and helmet usage percentages, and campus characteristic data from bicyclist responses. The Internet was used as an innovative approach to collecting data. Essentially the participant would simply locate the …

Investigation Of Various Shaping Methods For The Development Of A Fully-Monolithic Cmos Constant-Fraction Discriminator, Robert Gentry Jackson

Masters Theses

In this work the design of a constant-fraction discriminator (CFD) fabricated in the Orbit Semiconductor l.2-Jl n-well CMOS process is presented. This timing pick-off circuit is designed for use in the readout electronics of the Lead-Scintillator subsystem of the Pioneering High Eenergy Nuclear Ion eXperiment (PHENIX) Electromagnetic Calorimeter at the Relativistic Heavy Ion Collider (RHIC). The design was driven by stringent requirements including low power consumption, small area, arrayable, low cost and a fully integratable shaping network. Various integratable CFD shaping methods are investigated, and the candidate methods chosen for fabrication were the distributed R-C delay-line shaping, lumped-element R-C shaping …

Design And Fabrication Of A Mechanical Device For "In-Situ" Measurement Of Density Of A Wood Particle Mat During Pressing, Estevao V.C.M. De Paula

Doctoral Dissertations

The objective of this research was to design, fabricate and evaluate a device for in situ measurement of horizontal density of a wood particle mat during pressing. Requirements of the device were to maintain selected relative fixed positions, with reference to the press opening distance, during press closure.

A mechanical device was designed to .accommodate the requirements of the press environment, and to incorporate existing radiation based measurement equipment already in use in the laboratory. A system of stainless steel gears and racks was designed to maintain proportional velocity among three source and detector holders across the 24 inch opening …

The Study Of The Kinetics Of Crystallization Of Polymers During Rapid Cooling And Computer Modeling Of Melt Spinning Process, Zhuomin Ding

Doctoral Dissertations

A new technique based on Light Depolarizing Microscopy (LDM) for the study of nonisothermal crystallization of polymers was developed in this research. The cooling rates applied in this technique are not constant, and the polymer is cooled down by a cooling medium with constant temperature. The cooling rates applied in this dissertation ranged up to 2500 °C/min and the technique has a potential ability to reach much higher cooling rates. The temperature measurement was introduced into the LDM technique by using a thermocouple directly embedded in the polymer. A second light sensor was also introduced in the LDM technique to …

Design Methodology For Composite Structures Consisting Of Reinforced Hollow Brick Walls And Concrete Beams Connected At A Joint With Flashing And Subject To In-Plane Bending, John Kennedy Mccall

Doctoral Dissertations

Due to waterproofing requirements, a flashing joint is generally used at the base of a brick wall to facilitate transport of moisture from the back of a brick wall to the outside of the building. The flashing results in a loss of bond and reduced friction between the reinforced brick wall and the supporting structure. This loss of strength is of little consequence to veneer; however, it may impact wall behavior for reinforced hollow brick. This research, which uses hollow Suprking bricks as manufactured by the General Shale Co., develops data to assess the in-plane shear behavior of the flashing …

Impact Biomechanics Of The Human Body, Tyler A. Kress

Doctoral Dissertations

The research reported on in this dissertation has been systematically developed through a series of interrelated studies and experiments. The purpose has been to understand and characterize the effects of sever impact loading on the human body that results from accidents involving automobiles, motorcycles, boats, other vehicles, pedestrians, swimmer, et cetera. Previous work in this arena had relied strongly on simulations of human body anatomy, has focused on the microscopic mechanical properties of bone and soft tissue, or has resorted to analytical modeling.

Literature regarding mechanical properties of human tissue is plentiful. The experimental results in comparison among researchers are …

Effects Of Hypothetical NoX Sources In East Tennessee On The Ozone Concentrations Impacting The Gsmnp, Donald W. Brew

Masters Theses

This thesis studied the effects of hypothetical NO_x sources located in East Tennessee on the ozone concentrations impacting the Great Smoky Mountains National Park (GSMNP). The product of this study is a technique of assessing the potential impact of a new or modified large NO_x source on ozone concentrations within a Class I area, without requiring an up-to-date detailed emissions inventory. The study evaluates the MAP-03 model as a screening tool for selecting the day to be modeled by the Urban Airshed Model (UAM) for each hypothetical source location. The four source locations selected to be studied in …

Radiological Characterization Of A Uranium Processing Facility, C. A. England

Masters Theses

This document describes the plan that was developed and is being carried out at the Oak Ridge Y-12 Plant to provide data needed for radiological characterization of the site in anticipation of new posting regulations provided in Title 10, Code of Federal Regulations, Part 835, as codified from Volume 58, Number 238 of the Federal Register. The characterization plan addresses the entire site in terms of three categories: 1) Outdoor paved surfaces, 2) buildings, and 3) outdoor non-paved surfaces. Instruments chosen for use in this project are described, as well as survey techniques and the data management scheme. A quantitative …

Force Diagnostics Of Aerodynamic Bodies Based On Wake-Plane Data, Bohus Ondrusek

Masters Theses

The conventional method of using a balance to measure lift and drag on a model in a wind tunnel only provides information about the total quantities of these force components. Wake-survey analysis is a different technique developed for determining aerodynamic force on a body. Compared with the balance measurement, it provides a great deal of information about decomposed constituents and it clarifies the source of the aerodynamic force, but it also requires considerable work. In 1989, J.Z. Wu and J.M. Wu developed a unique theory, based on vorticity, for determining sources of aerodynamic force on a body from wake-plane data. …