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Modeling Of Diffusional Creep And Stress Relaxation In Copper Grains During Manufacturing Of Microelectronic Integrated Circuits, Vasyl M. Grychanyuk

Doctoral Dissertations

The finite element technique was developed to study diffusional creep and stress relaxation in Cu grains with several atomic monolayers thick grain boundary region of enhanced diffusivity. The model was motivated by the need to study nanoscale back-end interconnect structures of microelectronic circuits. These structures have the length scale that does not conform to the assumptions of classical dimensional theories of diffusional creep.

Both diffusion and elasticity governing equations are considered in the coupled formulation of mass flow and stress analysis. Vacancy concentration field in the grains subjected to external load is coupled to stress field through diffusional creep strains. …

Development And Characterization Of A Side Scan Sonar Towfish Stabilization Device, Rebecca Ann Conrad

Master's Theses and Capstones

The attitude of a side scan sonar towfish may introduce artifacts into the imagery when the towfish attitude exhibits a significant mean offset from horizontal and/or exhibits significant variations over time. The Smart Tail was designed by Boeing Australia for stabilizing the attitude of a Klein System 5000 towfish. This report describes the development and testing of a closed-loop controller for towfish attitude based on the Smart Tail's movable elevators. Transient and steady state response of the towfish pitch and roll motion were evaluated in a tow tank at speeds up to 6 knots. Mathematical modeling and simulation were used …

Retinal Tracking System Design For Smart Flashblindness Non Lethal Weapon, Gregory T. Wolff

Master's Theses and Capstones

Development of a non lethal method of providing incapacitation of human subjects is of primary importance in both law enforcement and military fields. The proposed Smart White Light Dazzler is such a device that induces flashblindness in the subject using a flash of white light. It is intended to automatically track the retina of a human subject, and then make adjustments to the power of the flash based on factors that affect the susceptibility of the eye. Temporary blindness is induced in the subject without risking permanent tissue damage.

The primary contribution of this research is the design of a …