A5041448701- Smart Materials for Construction
- Urban Stormwater Management Solutions
- Water Quality and Pollution Assessment
- CO2 Sequestration and Geologic Interactions
- Groundwater flow and contamination studies
- Diet and metabolism studies
- Hydrology and Sediment Transport Processes
- Scottish History and National Identity
- Combustion and flame dynamics
- Organ Transplantation Techniques and Outcomes
- Cardiac Ischemia and Reperfusion
- Historical Studies of British Isles
- Fish Ecology and Management Studies
- Hydrology and Watershed Management Studies
- Coastal wetland ecosystem dynamics
- Rocket and propulsion systems research
- Hydrocarbon exploration and reservoir analysis
- Geological and Geochemical Analysis
- Soil and Water Nutrient Dynamics
- Microbial Community Ecology and Physiology
- Geochemistry and Geologic Mapping
- Groundwater and Isotope Geochemistry
- Advanced Combustion Engine Technologies
- Historical Geography and Cartography
- Fire dynamics and safety research
Pennsylvania State University
2005-2024
Towson University
2013-2024
Inspire
2024
UPMC Altoona
2019-2024
University of Glasgow
1994-2017
Northwestern University
2013-2015
University of Hull
1971
Application of road salts in regions with colder climates is leading to ground and surface water contamination. However, we know little about how modern stormwater management practices affect the movement salt through urban watersheds. We investigated groundwater contamination transport at two ponds Baltimore County, Maryland. In association ponds, documented a plume contaminated that resulted Cl- loadings adjacent stream 6574 40 008 kg per winter, depending on winter snowfall. also...
The rapid expansion of urban land cover is associated with negative impacts on stream ecosystems. Elevated specific conductance (SC) and major ion concentrations are increasingly documented in streams. However, the degree to which nonpoint sources contribute elevated unclear. We characterized SC five small watersheds along a forested-to-urban gradient impervious surface (ISC) ranging from 0–25%, no point such as wastewater treatment plants, similar bedrock chemistry. Ion increase by an...
Increasing specific conductance (SC) and chloride concentrations [Cl] negatively affect many stream ecosystems. We characterized spatial variability in SC, [Cl], exceedances of Environmental Protection Agency criteria using nearly 30 million high-frequency observations (2–15 min intervals) for SC modeled from 93 sites across three regions the eastern United States: Southeast, Mid-Atlantic, New England. increase substantially south to north within with impervious surface cover (ISC). In...
ABSTRACT Corestones of quartz diorite bedrock in the Rio Icacos watershed Puerto Rico weather spheroidally to form concentric sets partially weathered rock layers (referred here as rindlets ) that slowly transform saprolite. The rindlet zone (0.2–2 m thick) is overlain by saprolite (2–8 m) topped soil (0.5–1 m). With objective understanding interactions between weathering, substrate availability, and resident micro‐organisms, we made geochemical microbiological measurements a function depth...
Sources of many major ions in urban streams remain ambiguous, particularly for unrelated to deicing salt use, and temporal patterns concentrations are unstudied. We used 16 years water chemistry data based on weekly samples from the Baltimore, MD, USA, metropolitan area Weighted Regressions Time, Discharge, Season approach investigate connections between ions, land cover, time. All watersheds were underlain by silicate bedrock, contained no regulated point sources, had stable cover. Major...
Abstract Synoptic sampling of streams is an inexpensive way to gain insight into the spatial distribution dissolved constituents in subsurface critical zone. Few synoptics have focused on urban watersheds although this approach useful areas where monitoring wells are uncommon. Baseflow stream was used quantify variability water chemistry a highly developed Piedmont watershed suburban Baltimore, MD having no permitted point discharges. Six synoptic surveys were conducted from 2014 2016 after...
Abstract Stream restoration includes a number of different approaches intended to reduce sediment and nutrient export. Legacy removal (LSR) floodplain reconnection (FR) involve removing anthropogenically derived accumulated in valley bottoms reconnect incised streams their floodplains. These projects also present an opportunity create high-quality riparian wetland plant communities provide information about the early stages vegetation development succession. We surveyed immediately after at...
Abstract Understanding urban carbon cycling is essential given that cities sustain 54% of the global population and contribute 70% anthropogenic CO2 emissions. When combined with concentration measurements ([CO2]), stable isotope analyses (δ13C) can differentiate sources CO2, including ecosystem respiration combustion fossil fuels, such as petroleum natural gas. In this study, we used a wavelength scanned-cavity ringdown spectrometer to collect ∼2x106 paired for [CO2] δ13C values in...
Abstract The effectiveness of many stream restorations in improving water quality is unmeasured. In the Mid-Atlantic region United States, activity by European settlers resulted upland erosion and deposition sediments 1–3 m thickness valleys. Subsequently, streams incised those legacy creating steep, exposed banks, infrequent floodplain inundation, tables disconnected from floodplains. Legacy sediment removal (LSR) reconnection (FR) proposes improvement restoration to a hydrological state...
Drugs that induce reversible slowing of metabolic and physiological processes would have great value for organ preservation, especially organs with high susceptibility to hypoxia-reperfusion injury, such as the heart. Using whole-organism screening metabolism, mobility, development in Xenopus, we identified an existing drug, SNC80, rapidly reversibly slows biochemical activities while preserving cell tissue viability. Although SNC80 was developed a delta opioid receptor activator, discovered...
The focus of this research was understanding the effect varying secondary flow impingement angle a single coaxial injector in an experimental non-premixed flame burner on stability. horizontally mounted, rectangular combustion chamber with retractable spark plug for ignition. Reactants were gaseous oxygen and methane as primary flow, respectively. Three injectors designed fabricated exit angles 15, 30, 45 degrees flow. diffusion behavior standoff distance length observed through optical side...
Abstract Sulfate is a potential pollutant and important nutrient linked with the nitrogen, carbon, phosphorus cycles. The importance of different anthropogenic sulfate sources in suburban streams (septic systems, fertilizer, road salt, infrastructure) uncertain, temporal dynamics stream export sparsely documented. We study forested headwater catchments. Stream baseflow discharge concentrations were strongly positively correlated both watersheds highest values spring. Suburban fluxes...
The focus of this research was the design, fabrication, and testing an experimental non-premixed flame burner to determine effect gaseous flow parameters geometry on stability methane/oxygen combustion. consisted a horizontally mounted, rectangular combustion chamber with single coaxial injector, capable introducing reactants at specified impingement angle 30° exit plane. Gaseous oxygen primary methane secondary flow. equipped optical windows both sides parallel axis flame, which allowed for...
Drawn from the norms and rules of their fields, scientists use variety practices, such as asking questions arguing based on evidence, to engage in research that will contribute our understanding Earth beyond. In this study, we explore how preservice teachers' learn teach scientific practices while teaching plate tectonic theory. particular, aim is observe which teachers an earth science unit, do they integrate these into lessons, what challenges face during first time content area integrated...