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.

 
Submit to DRUM

Submit to DRUM

To submit an item to DRUM, login using your UMD credentials. Then select the "Submit Item to DRUM" link in the navigation bar. View DRUM policies and submission guidelines.
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.

List of Communities

Collections Organized by Department

UM Community-managed Collections

Recent Submissions

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30 Parent Number Input
(2024-07-15) Mix, Kelly; Cabrera, Natasha; not applicable
This dataset contains codes of parent numeracy input including number word utterances, other quantitative words, and quantitative actions or gestures based on a set of video recorded home visits conducted for a separate study (Cabrera & Reich, 2017) when children were 30 months old. The dataset also includes demographic information and children's scores on a numeracy outcome measure collected when children were 43 months on average. The parent number input codes were collected in 2022-2023 and the children’s numeracy outcome scores collected between 2020-2021.
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OUR's Student-Proposed Innovation & Research Experience (SPIRE)
(2024) Sare, Perfect; Jones, Morgan; Chi, Zehua; Riggins, Tracy
Understanding brain development is a critical area of neuroscience requiring comprehensive research. Numerous factors, including prenatal drug exposure (PDE), significantly influence both pre- and postnatal brain development. The HEALthy Brain and Child Development (HBCD) Study is a longitudinal study that aims to explore these impacts and advance our knowledge of early brain and child development. It utilizes multiple, carefully curated methods to obtain physiological data from participants, including diverse patient recruitment, biospecimen collection, and various MRI scans. This poster will address these methods of data collection and how they will contribute to future research. 2
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Enhanced Computational Tool for Seismic Fault Sensitivity Screening
(2024) Subramaniyan, Vishnu; Mandhan, Sai; Maheshwari, Raunak; Bensi, Michelle; Lundstern, Jens-Erik
Earthquakes occur when stress exceeds the strength of pre-existing faults, potentially causing severe damage to the built environment. It is critical to identify the faults that are most likely to rupture, given our knowledge of various subsurface properties. Existing fault screening tools are closed-source or have limitations that affect their usefulness in research and engineering applications. Our team is developing a more efficient, open-source seismic fault sensitivity screening software program designed to support probabilistic seismic hazard analysis and geophysical research. Our research aims to improve upon existing tools by leveraging vectorization to increase calculation speeds and offering choice among multiple probabilistic distributions to capture uncertainty in input parameters. Moreover, the open-source nature of this tool enables researchers to adapt the program for their own purposes to support seismic hazard assessment.
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BioCascade Exhaled Breath Sampler (BEBS): Sample Viability
(2024) Chartrand, Ansley; Coleman, Kristen
The viability of samples collected in the BioCasade Exhaled Breath Sampler (BEBS) machine is to be measured by simulating an exhaled breath sampling event via a Collison nebulizer. There are four stages the nebulized stimulants are divided into within the BEBS system, they divide the particles based on size. The stages are labeled large, medium, small, and BioSpot and they collect particles of sizes >8.2µm, 3.3-8.2µm, 1.15-3.3µm, and <1.15µm respectively. Similar experiments have been done to examine the viability of collected samples in the BEBS system but all are done at lower collection flow rates, where this test collects at 12 lpm. In addition, this experiment collects the nebulized virus onto a hydrogel surface as opposed to previously used liquid mediums. PR8 virus will be used as the model to simulate the collection of influenza viruses. The purpose of this experiment is to recreate real-world collection data to ensure the BEBS efficacy for collecting culturable samples prior to clinical use in the EMIT-2 study.
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222 nm UV Disinfection of Bacteriophages as Surrogates for Eukaryotic Viruses
(2024) Lim, Mariana K.; Fadaka, Esther A.; Coleman, Kristen K.
Germicidal ultraviolet (GUV) radiation, particularly shortwave UV-C (200-280 nm) is a promising technique used for disinfection of several microbiological targets. In the wake of the COVID-19 pandemic, its use for disinfecting eukaryotic viruses has garnered attention as an intervention to prevent transmission of airborne respiratory viruses. This study examines 222 nm GUV, primarily in liquid, and uses various bacteriophages (MS2, Phi6, T1, and T4) as surrogates to model eukaryotic viruses, aiming to broaden current understanding of GUV disinfection efficacy and virus models. Usage of bacteriophages (RG1 organisms) as virus surrogates serves as a low risk alternative to handling pathogenic viruses (RG2 organisms), allowing for safer infectious disease transmission mitigation research. UV exposures of bacteriophages were conducted in a collimated beam chamber designed according to Bolton and Linden (2003) [1], which was validated using iodide/iodate actinometry. For MS2 phage experiments, approximately 0.75, 1.1, 4.5, and 6.4 log reductions in PFU/mL were observed following UV exposures of 2.5, 5, 15, and 30 minutes (fluence of 7.60, 15.22, 45.65, 91.29 mJ/cm2), respectively. Liquid experiments with other phages are still ongoing. Continued efforts will also explore 222 nm disinfection in an aerosol state via a single pass flow chamber, using the same virus models as in liquid. Future work will also repeat all experiments with eukaryotic viruses such as influenza to compare virus behavior to that of the phages. [1] Bolton, J. R., & Linden, K. G. (2003). Standardization of methods for fluence (UV dose) determination in bench-scale UV experiments. Journal of environmental engineering, 129(3), 209-215.