Theses and Dissertations from UMD

Permanent URI for this communityhttp://hdl.handle.net/1903/2

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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2004 - 20072

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    Development of Video Image Detection Algorithm for Smoke Plumes
    (2007-07-03) Kouchinsky, Alan John; Milke, James A; Fire Protection Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    The objective of this work is to develop a predictive activation time algorithm for smoke plumes for axonX's SigniFire video image detection (VID) system from recent tests in a large volume space performed at the University of Maryland's (UMD) Cole Field House. The SigniFire system was able to detect a smoke plume from distances of 37.8 m (124 ft) to 54.9 m (180 ft) typically before the smoke reached the ceiling. The goal is to establish an understanding of the significant parameters affecting activation time based on observations and trends from the video image data. As a result of the understanding, insight into a predictive algorithm is developed, which is the first step toward future use of the VID system for a performance based design.
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    Characterizing Cigarette Lighter Flames to Reduce Unwanted Ignition
    (2004-09-14) Williamson, Justin Wade; Marshall, Andre W; Quintiere, James G; Trouve, Arnaud; Fire Protection Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    This investigation provides detailed measurements and analysis for improved understanding of ignition from the 'small' flames produced by cigarette lighters. This research program is motivated by the need to improve the fire safety of cigarette lighters in response to the juvenile firesetter problem. A novel cigarette lighter concept for improved ignition safety has been developed, characterized, and compared with conventional lighters. Diagnostics were performed to measure laminar near-field plume behavior and turbulent far-field behavior in these small-scale (75W) flames. Plume diagnostics include centerline temperature, heat flux to a horizontal flat plate, and ignition of filter paper. Data was scaled and compared to plume theory and measurements. Other practical cigarette lighter performance related properties were also noted, such as lighter surface temperatures and cigarette ignition effectiveness.