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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    Feasibility Analysis and FDS Modeling of Water Mist Fire Suppression Systems for Protection of Aircraft Hangars
    (2021) Steranka, Karolyn; Milke, James; Fire Protection Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Concern about PFAS containing foam fire suppression agents’ negative environmental impact motivated the U.S. Air Force to perform a two-phase feasibility analysis of water mist systems for protection of aircraft hangars. Phase I involved a feasibility analysis of COTS water mist technologies based on manufacturer specifications, literature, and previous test data. Phase I identified seven manufacturers who have developed systems with potential for successful protection of aircraft hangars. Phase II used FDS to model two low pressure and one high pressure system identified in Phase I. Phase II completed an analysis and validation simulations of the Lagrangian particle, extinction, and evaporation model in FDS. Following validation simulations each nozzle was tested in a full-scale hangar configuration for protection of a JP-8 spill fire. The results found the high-pressure mist system was able to extinguish the fire and earlier activation times lead to less damage to the aircraft and hangar compartment.
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    Learning to Forget: An Interference Account of Cue-Independent Forgetting
    (2009) Tomlinson, Tracy Darlene; Dougherty, Michael R; Psychology; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Memory suppression is investigated in inhibition paradigms that produce cue-independent forgetting. Because the forgotten items are not retrieved even when tested with an independent, semantically related cue, it has been assumed that this forgetting is due to an inhibition process. However, this conclusion is based on comparing inhibition to classic interference theory with a single stage of recall. Yet, memory models, which produce forgetting through a process of interference, include both a sampling and a recovery stage of recall. A neo-classic interference theory is proposed, which assumes that interference exists during recovery as well as sampling and can explain cue-independent forgetting. Three behavioral studies tested predictions of the neo-classic interference theory. Experiment 1 found support for recovery interference in testing key predictions of the theory within the think/no-think paradigm. Most importantly, learning to quickly press enter produced as much cue-independent forgetting as no-think instructions. Experiment 2 tested the role of word frequency in terms of sampling and recovery, but failed to obtain cue-independent forgetting. Experiment 3 reversed the order of blocks and produced original cue forgetting following retrieval practice with independent cues, which provided a clear manipulation of recovery strength. Lastly, a mathematical model (SAM-RI) of neo-classic interference theory was specified that captures data from Experiment 1, Experiment 3, and is extended to the greater retrieval induced forgetting.