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 …

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 …