UMD Theses and Dissertations

Permanent URI for this collectionhttp://hdl.handle.net/1903/3

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 given thesis/dissertation in DRUM.

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

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2014 - 20182

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Author: search.filters.author.Liu, Jiayu

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    International Student Community
    (2018) Liu, Jiayu; Rockcastle, Garth; Architecture; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    In order to receive a more advanced and diverse education, more students opt for an international status and choose to apply for overseas universities. Not only are their course loads greater than domestic students, but also, they must learn to adapt to local culture and lifestyle. Furthermore, a social stigma may present itself between student bodies, especially as for some local students, a cultural disparity with “new” people of different backgrounds inevitably leads to moments of convergence. As a sanctuary for learning and personal engagement, a campus setting will best serve as a testing grounds for this thesis proposal. University of Maryland has a collective diversity, which provides a great opportunity for development of international and local student communities. This community serves for the needs for both public space to hold people together and private space to help them feel as secure and comfortable as home. The site for the new community is located near the campus in order to strengthen the connection with University of Maryland geographically and academically. The site is also close to public transportation, which opens opportunities for various prototypes of development to nearby urban centers, such as Greenbelt, Hyattsville, and Silver Spring. This thesis is aimed to present a model for future international student communities in other universities.
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    FIELD EVALUATION OF ENHANCED PHOSPHORUS AND NITROGEN REMOVAL IN STORMWATER CONTROL MEASURES
    (2014) Liu, Jiayu; Davis, Allen P; Civil Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    This project evaluates two innovative stormwater control measures (SCMs) installed on the University of Maryland campus in College Park, Maryland. One project retrofitted an existing bioretention cell with 5% (by mass) aluminum-based water treatment residual (Al-WTR) to enhance phosphorus removal (P1 site). The other combined a porous parking area with underground anoxic vaults to promote nitrogen removal (N1 site). At the P1 site, the net reduction of the total runoff was 40% and the volume reduction ratios ( ) were lower than before the retrofit. The total suspended solids (TSS), total phosphorus (TP), and particulate phosphorus (PP) concentrations were significantly reduced by the bioretention cell, due to the filtration of the particulate matter, while TP export occurred before WTR retrofit. Soluble reactive phosphorus (SRP) and dissolved organic phosphorus (DOP) concentrations in the stormwater runoff were not obviously changed compared to the system effluent. The near constant outflow of SRP and DOP concentrations suggest an equilibrium adsorption treatment mechanism. Mass loads were reduced for TSS and all P species. WTR incorporation decreased the bioretention media phosphorus saturation index (PSI) from approximately 0.075 to approximately 0.041, which stayed relatively constant during the two year study period, even with the media P continually increasing, indicating a significant increase in media P sorption capacity. At the N1 site, the flow management achieved nearly zero runoff discharge due to infiltration from the vaults during dry weather. With regard to the porous pavement, approximately 34% of the total nitrogen (TN) (4.7 kg/ha-yr) was mitigated by filtration processes; 6.5 kg/ha-yr particulate organic nitrogen (PON) and 1.8 kg/ha-yr ammonium nitrogen ( ) were removed, and 4.0 kg/ha-yr oxidized nitrogen (NOx) were created. In the denitrification vaults, approximately 26% of the TN (3.7 kg/ha-yr) was decreased by system reaction, mostly due to the decrease in NOx (3.8 kg/ha-yr). PON was reduced slightly, by 0.2 kg/ha-yr. The small amount of DON and produced likely resulted from leaching from the wood logs. As a result, the N mass reduction that occurred was not only due to volume reduction, but also to system reactions (60%).