DRUM - Digital Repository at the University of Maryland

DRUM collects, preserves, and provides public access to the scholarly output of the university. Faculty and researchers can upload research products for rapid dissemination, global visibility and impact, and long-term preservation.

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Submit to DRUM

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Equitable Access Policy

Equitable Access Policy

The University of Maryland Equitable Access Policy provides equitable, open access to the University's research and scholarship. Faculty can learn more about what is covered by the policy and how to deposit on the policy website.
Theses and Dissertations

Theses and Dissertations

DRUM includes all UMD theses and dissertations from 2003 forward.

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Recent Submissions

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    Global Oceans
    (American Meteorological Society, 2024) Johnson, G.; Lumpkin, R.; Alexander, Michael; Amaya, Dillon; Beckley, Brian; Boyer, Tim; Bringas, Francis; Carter, Brendan; Cetinić, Ivona; Chambers, Don; Chan, Duo; Cheng, Lijing; Dong, Shenfu; Elipot, Shane; Feely, Richard; Franz, Bryan; Fu, Yao; Gao, Meng; Garg, Jay; Giglio, Donata; Gilson, John; Goes, Marlos; Graham, Garrett; Hamlington, Benjamin; Hobbs, Will; Hu, Zeng-Zhen; Huang, Boyin; Ishii, Masayoshi; Jacox, Michael; Jersild, Annika; Jevrejeva, Svetlana; Johns, William; Killick, Rachel.; Kuusela, Mikael; Landschützer, Peter; Leuliette, Eric; Liu, Chao; Locarnini, Ricardo; Lozier, Susan; Lyman, John; Merrifield, Mark; Mishonov, Alexey; Mitchum, Gary; Moat, Ben; Nerem, R.; Oe, Mitsuho; Perez, Renellys; Pita, Ivenis; Purkey, Sarah; Reagan, James; Sato, Kanako; Schmid, Claudia; Smeed, David; Smith, Ryan; Stackhouse, Paul; Sukianto, Thea; Sweet, William; Thompson, Philip; Triñanes, Joaquin; Volkov, Denis; Wanninkhof, Rik; Weller, Robert; Westberry, Toby; Widlansky, Matthew; Willis, Josh; Yin, Xungang; Yu, Lisan; Zhang, Huai-min
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    Supporting Movie files for Fuel-Driven Rapid Swelling and Shrinking in Porous Hydrogels
    (2026) Rath, Medha; Wood, Jemma; Srivastava, Satyam; Battumur, Sarangua; Mazurkiewicz, Alicja; Raghavan, Srinivasa R; Woehl, Taylor J; Woehl, Taylor J
    Biological systems are known for their transient and autonomous responses, such as muscle actuation and cell division. Soft materials that mimic these responses have been investigated, with examples including materials that actuate or morph when exposed to chemical fuels. However, their reconfiguration times extend to tens of hours, which is 10 to 100 slower than biological systems. Here, for the first time, we demonstrate autonomous responses (swelling and shrinking) in porous hydrogels that occur in < 1 h. The gels are crosslinked networks of acrylic acid and acrylamide copolymers containing ~100 µm interconnected pores. When a carbodiimide chemical fuel is added to swollen gels, anionic carboxylates are converted to nonpolar anhydrides, causing the gels to shrink by ~50% in 5 min. The anhydrides then spontaneously hydrolyze and revert to their anionic form, causing the gels to autonomously reswell in < 1 h. The reswelling time increases with decreasing porosity and increasing fuel concentration. We show that rapid gel shrinkage upon fuel exposure occurs via convective water transport out of pores, while reswelling occurs via rapid bulk hydrolysis of anhydrides. This work thereby uncovers general mechanisms for quickening the response of soft materials to chemical triggers.
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    n books in one, or, a discourse on bound-withs on the shelf and in the catalog
    (2026-06-04) Hovde, Sarah
    When a cataloger pulled it from the shelf, it looked like any other old book… but inside its covers lurked not just one book, but many. And within those pages lay still more layers of bibliographic complications… "Bound-with" volumes combine two or more separately published books into one physical item, presenting both intellectual and logistical challenges for librarians. This presentation will present several bound-with volumes from the Libraries' Special Collections and University Archives, using them as a window to discuss the development and implementation of cataloging standards, Alma functionality, and the overall process of bibliographic description.
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    Evaluating Tropical Cyclone Intensity Forecasts from HAFS Using Satellite-Derived Ocean Profiles
    (American Meteorological Society, 2025) Lavin, Paige D.; Byrne, Deirdre A.; Gramer, Lewis J.; Trossman, David S.
    As the ocean warms, tropical cyclones (TCs) may become more dangerous and costly for coastal communities since oceanic heat can increase TC intensity. Accurately modeling and forecasting TC intensity changes, especially from rapid intensification (RI) events, is challenging. Both RI and rapid weakening (RW) events can be strongly influenced by the heat content and stratification of the upper ocean, particularly for larger and slower-moving TCs. Better information about upper-ocean conditions can thus aid in the evaluation and potentially the improvement of RI/RW forecasts. The National Oceanic and Atmospheric Administration (NOAA) Next-Generation Enterprise Ocean Heat Content (NGE OHC) algorithm, an empirical parameterization, generates depth-resolved ocean temperature and salinity profiles that will be used operationally to estimate daily upper OHC fields and support detailed analysis of the potential oceanic contributions to RI/RW. The method leverages known ocean dynamics from relatively sparse in situ data to directly estimate profiles at high vertical and horizontal resolution from satellite data. In case studies from the 2020–22 Atlantic hurricane seasons, daily oceanic conditions from the NGE OHC are retrospectively compared with in situ Argo float observations, model initializations from the Hurricane Analysis and Forecast System (HAFS version 1.0B), and a current operational NOAA OHC product to illustrate how the NGE OHC would have helped improve the model’s initial ocean state in the Gulf of Mexico and Caribbean Sea. These comparisons show that many HAFS forecasts with intensity busts miss near-surface heat and barrier layers found in observations and the NGE OHC synthetic profiles.
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    Is China-Taiwan Rapprochement Possible? Experimental Evidence From Taiwan
    (Journal of Conflict Resolution, 2025) Pan, Hsin-Hsin; Kastner, Scott L.; Pearson, Margaret L.
    Any peaceful resolution to the Cross-Strait conflict between China and Taiwan is likely to be composed of give-and-take between the two sides, and any agreement will ultimately require the support of Taiwan’s citizens, by whom Taiwan’s leaders are held accountable. Yet little is known about the actual tradeoffs Taiwanese citizens are willing to make in pursuit of an agreement in a time of peace. In conjoint experiments fielded in Taiwan in April 2022, we present Taiwanese respondents with hypothetical Cross-Strait agreements that randomly assign economic, security, and sovereignty-related concessions by the two sides. We find that support for agreements is conditioned by the concessions included, with sovereignty-related or security-related concessions by Taiwan lowering support, and sovereignty or security-related concessions by China increasing support. Additionally, respondents indicate that neither US support nor PRC threats significantly influence support for agreements, and that Taiwan's acceptance of an agreement substantially reduces the perceived likelihood of conflict.