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Full-Text Articles in Engineering
Non-Destructive Evaluation Of Space Shuttle Thermal Protection System Tile Bond Integrity, George David Mulligan
Non-Destructive Evaluation Of Space Shuttle Thermal Protection System Tile Bond Integrity, George David Mulligan
Retrospective Theses and Dissertations
Experimental modal analysis (EMA) is used as a non-destructive technique for the evaluation of Space Shuttle thermal protection system (TPS) tile bond integrity. Finite element (FE) models for tile systems were developed and were used to generate their vibration characteristics (i.e. natural frequencies and mode shapes). Various TPS tile assembly configurations as well as different bond conditions were analyzed. Results of finite element analyses demonstrated a drop in natural frequencies and a change in mode shapes which correlate with both size and location of disband. Results of experimental testing of tile panels correlated with FE results and demonstrated the feasibility …
Emissions Of Hexavalent Chromium From Hard Chromium Plating Operations, Mitchell Scott Hall
Emissions Of Hexavalent Chromium From Hard Chromium Plating Operations, Mitchell Scott Hall
Retrospective Theses and Dissertations
This research addresses emissions of hexavalent chromium mist from hard chromium electroplating operations. Most of these emissions are typically captured by a ventilation stack and directed to a pollution control device; those which escape capture are called fugitive emissions. Releases of toxic materials such as hexavalent chromium must be reported annually to the Environmental Protection Agency (EPA) under provisions of the Superfund Amendments and Reauthorization Act (SARA) Title III of 1986 via the Toxic Release Inventory (TRI), Form R. The objectives were: (1) to provide estimates of fugitive hexavalent chromium emissions for the completion of Form R; and (2) to …
Express Transit Service For The University Of Central Florida, Arturo J. Perez
Express Transit Service For The University Of Central Florida, Arturo J. Perez
Retrospective Theses and Dissertations
As one of the fastest growing universities in the State of Florida, the University of Central Florida (UCF) is faced with the hardships placed on higher learning institutions across the nation. The increase of students paralleled by the increase of motor vehicles on the university campus, and the shortage of funding needed to construct the necessary parking facilities to support this growth, has left the University with a big dilemma, whether to try to overcome the parking space deficit by building the needed spaces to accommodate the demand, or provide a mass transit system that would reduce the number of …
Electromagnetic Focusing Properties Of Chirped Metallic Gratings, Jeffrey C. Schmidt
Electromagnetic Focusing Properties Of Chirped Metallic Gratings, Jeffrey C. Schmidt
Retrospective Theses and Dissertations
The focusing properties of chirped diffraction gratings have long been studied and often used in applications at optical frequencies. Chirped metallic gratings of this type have also been studied theoretically at microwave frequencies, but no attempt has been made to experimentally examine or utilize the focusing properties of these structures at microwave frequencies. This thesis presents an experimental analysis of the focusing properties of chirped metallic gratings. These gratings are designed to focus electromagnetic energy at a predetermined position by varying strip width and spacing as a function of position. The diffraction gratings are characterized, and experimentally measured results are …
Microchannel Fluid Flow In A Silicon Chip, Ronald R. Ulseth
Microchannel Fluid Flow In A Silicon Chip, Ronald R. Ulseth
Retrospective Theses and Dissertations
The objective of this study was to analyze theoretically and experimentally the fluid characteristics of forced flow in microchannels. An apparatus was designed and constructed to allow microflow through a 450 μm wide by 17. 5 μm deep microchannel in a silicon chip. The flow through the chip was laminar with Reynolds numbers not exceeding 100. Tuckerman and Pease (1981) theorized that microscopic heat exchangers etched in the back of silicon chips could provide for efficient heat removal from the chips at rates much higher than the conventional methods could attain. The best technologies available provided for heat removal rates …