Engineering Commons^™

The Implementation Of Nanoimprint Lithography For The Fabrication Of Patterned Magnetic Media, Daniel David Marks

Theses and Dissertations

Advances in technology are having profound effects throughout society. This is no truer than in the way information is being stored. The primary form of information storage for at least the past millennium has been paper. Today, an ever increasing amount of information is being stored electronically. An increased demand for high-performance, low-cost information storage has been a major catalyst in increasing the popularity of hard drives. In 2002, two exabytes of original information was stored on hard drives. This is ten times the amount of all printed material in the world if it were converted to electronic files. To …

An Algebraic Reconstruction Technique (Art) For The Synthesis Of Three-Dimensional Models Of Particle Aggregates From Projective Representations, Daniel Jonathan Randall-Barrot

Theses and Dissertations

There exists considerable evidence that the shear behavior and flow behavior of granular materials is significantly dependent on particle morphology. However, quantification of this dependence is a challenging task owing to a dearth of quantitative models for describing particle shape and the difficulty of modeling angular particle assemblies. The situation becomes more complex when discrete element analyses of realistic 3-D particle shapes are required. The thesis attempts to address this problem by adapting the algebraic reconstruction technique (ART) to synthesize composite 3-D granular particles from statistically obtained 3-D shape descriptors of the particles in an aggregate mixture. This thesis extends …

Green Engineering And Gate-To Gate Life Cycle Assessments For Pharmaceutical Products, Daniel Fichana

Theses and Dissertations

The research of this thesis focused on the environmental and processing metrics during the development of two different drugs. Previous research in life cycle assessments and green engineering have focused on other products and processes, but only a limited amount of studies have been conducted for pharmaceutical applications. This analysis concerned a gate-to-gate analysis of two distinct pharmaceutical products along with the development of a solvent selection table. The goal of this research was to determine how various processing and environmental metrics were affected by process improvements.

The first drug was the pravastatin, which was made via a fermentation route. …

A Patterning Process Utilizing A Nanoimprint Lithography For Fabrication Of Planar Perpendicular Patterned Magnetic Media, Robert Grove Iii

Theses and Dissertations

This thesis describes the results of applied research in the area of patterned magnetic media. Current magnetic media is pushing the physical limits of magnetic bits by compressing them into very small spaces - a process that will eventually be hampered by the superparamagnetic effect. The superparamagnetic effect will require the magnetic media industry to find a modified method of storing magnetic bits. Perpendicular patterned magnetic media could be the method of choice for future generations of magnetic data storage. Patterning magnetic media allows bits to be stored in isolated magnetic islands instead of in a continuous magnetic surface, as …

The Accuracy Of Energy-Based Crash Reconstruction Techniques Using Event Data Recorder Measurements, Peter Niehoff

Theses and Dissertations

In the field of accident investigation, a vehicle's delta-V is commonly used to quantify the severity of a collision. Delta-V is defined as the impulsive change in vehicle velocity caused by a collision. Often, the method used to obtain delta-Vs in real-world collisions is estimation based on post-collision vehicle crush measurements. However, these estimates have been known to result in large errors. The recent advent of Event Data Recorder (EDR) technology has provided engineers with measured delta-Vs from real-world collisions. These accurate measurements were the basis for several studies conducted in this thesis.

As EDRs are a new technology, little …

The Sensitivity Of Aircraft Emergency Locator Transmitters To Non-Distress Impact Events, Christopher John Molnar

Theses and Dissertations

Emergency locator transmitters are radio beacons that help locate aircraft in distress and are required on many aircraft, primarily general aviation aircraft. The purpose of an emergency locator transmitter is to assist SAR teams in rapidly locating downed aircraft so aid can be provided to the pilot and passengers. The first emergency locator transmitters, still in use today, were found to have crash activation rates of only twenty-five percent (25%). This means that three out of every four crashes are not detected by these devices. Newer emergency locator transmitters were found to have crash activation rates of seventy-three percent (73%) …

Three-Dimensional Finite Element Modeling As A Tool For Flexible Pavement Design And Analysis, Michael L. Willis

Theses and Dissertations

This study investigates the potential of using finite element modeling for analyzing the performance of flexible pavement. The study is deemed necessary because of the complexity of the landing gears and heavy loads imposed by heavier and bigger aircraft, like the Boeing 747-400, Airbus A380 and Boeing 777.

The development of the finite element model required a finite element mesh design study and two verification studies conducted to show that the material properties and material models used in the study gave a good representation of the individual soil and also the response of the pavement structure.

The dynamic analysis which …

Photocontrol Data Acquisition System For Lamp Life Prediction In High Pressure Sodium Lighting, Jeffrey William Tisa

Theses and Dissertations

This thesis begins with a brief historical account of high intensity discharge (HID) lighting. It begins in the seventeenth century and concludes with the modem high pressure sodium (HPS) lamp, which has become the most widespread HID lighting source due to its high efficacy (Lumens/Watt) and acceptable color rendition. Following a more in-depth discussion on the HPS lamp, a means of estimating the arc tube voltage of an HPS lamp from the confines of a photocontrol is introduced. This technique is implemented as part of a 'smart' photocontrol data acquisition unit that functions as part of a proposed practical asset …