Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"Northeastern U.S."”.
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Linking Carbon, Nitrogen, And Calcium Cycling In Northeastern U.S. Forests
… by the balance of new inputs and losses. In the northeastern U.S., the availability of these elements has been dramatically altered by human activities. Acid deposition has increased N inputs and caused declines in soil Ca concentrations. Concurrently, atmospheric carbon dioxide concentrations …
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Biogeochemical Modeling of the Response of Forest Watersheds in the Northeastern U.S. to Future Climate Change
… change conditions on forested watersheds in the northeastern U.S. using climate projections from several atmosphere ocean general circulation models (AOGCMs) under different carbon dioxide (CO2) emissions scenarios. The impacts of changing climate on terrestrial ecosystems have been assessed by …
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Multi-scale analysis of 6PPD-quinone: distribution, environmental risk, and urbanization influence in the Delaware River Basin
… Asian water systems, environmental data from northeastern U.S. freshwater ecosystems remain limited. This dissertation addresses this gap through a multiscale investigation of spatiotemporal distribution, ecological risk, urbanization impact and leaching dynamics of 6PPDQ across two major …
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Continental outflow of polluted air from the US to the North Atlantic and mercury chemical cycling in various atmospheric environments
… and mercury chemical transformation in the northeastern U.S. MDEs were studied by simulations using a chemical box model and data analysis of NASA DC-8 flights during the Arctic Research of the Composition of the Troposphere from Aircraft and Satellites field campaign. A chemical box model …
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Population dynamics, mortality factors, and pest status of alfalfa weevil in Virginia
… being under complete biological control in the northeastern U.S. In 1996, a survey of 187 alfalfa fields in Virginia was initiated to determine the current pest status of alfalfa weevil and incidence of natural enemies. Fields located in the Piedmont region of the state had significantly higher …
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Synoptic controls on ozone over the northeastern US and continental export
… were investigated for the surface over the northeastern U.S. as well as for the spring-, winter- and summertime North American export and trans-Atlantic Transport. The latter studies utilized the Tropospheric Emission Spectrometer (TES) retrievals of O3 and carbon monoxide (CO) to explore …
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Design, Testing And Controls For Air Source Heat Pump System In Cold Climates Using Natural & Conventional Refrigerants
… systems used in the residential buildings in northeastern U.S region are not only inefficient but also largely responsible for the greenhouse gas emissions in U.S. Electrification of the buildings has been proved to be the most efficient way to reduce the greenhouse gas emissions where Heat …
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Exploring rising anxiety levels in higher education : perspectives of administrators, faculty, and students on essential support and barriers
… from institutes of higher education in the Northeastern U.S. Utilizing a convergent design, quantitative data were collected from students through the Depression Anxiety Stress Scale (DASS-21), the University Belonging Questionnaire (UBQ), and the Student Self-Efficacy Scale (SSE). Faculty …
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Assessing the impacts of white-nose syndrome induced mortality on the monitoring of a bat community at Fort Drum Military Installation
Since white-nose syndrome (WNS) arrived in the northeastern U.S. in 2006, several affected bat species have exhibited marked population declines (> 90%). For areas such as Fort Drum in northern New York that are subject to regulatory mandates because of the presence of the endangered Indiana bat …
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Building a Comprehensive Understanding of Disturbance Mitigation in Migrating Shorebirds
… human disturbance to migratory shorebirds in the Northeastern U.S. Finally, we conducted a survey of beachgoers to evaluate a shorebird conservation outreach campaign and examined the factors that influence pro-shorebird behavior change. This research demonstrates how integrating social and …
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The deconstruction of ambition: Campus climate, stereotype threat, and the motivational goals of African American students at a selective small liberal arts college
… predominantly White, liberal arts college in the northeastern U.S., this study uses both survey and interview data to assess campus racial climate as perceived by White students, and capture and discrepancies between reported beliefs and actions; and, ascertain the achievement goal orientation of …
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Investigating the pH of atmospheric fine particles and implications for atmospheric chemistry
… then extended to aircraft observations in the northeastern U.S. in winter (WINTER study; pH = 0.77 ± 0.96) and ground observations in the coastal southwestern U.S. in early summer (CalNex study; PM1 pH = 1.9 ± 0.5 and PM2.5 pH = 2.7 ± 0.3). All studies have consistently found highly acidic PM1 …
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School Counselor Advocacy: Postsecondary Planning for Adolescents Experiencing Emotional Disturbances in Urban Environments
… working within a large school district of the northeastern U.S. on postsecondary planning with students experiencing emotional disturbances in urban environments. An ecological perspective framed the discussion to provide a holistic picture of the postsecondary needs of adolescents experiencing …
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Dynamics of water, carbon, and nitrogen in forest and alpine tundra ecosystems in the Pacific Northwest and the Rocky Mountains of the U.S. under future climate change
… applied to the forest ecosystems in the northeastern United States, the interactive effects of multiple environmental factors on ecosystem function and element dynamics can be investigated. </p> <p>In this dissertation, I applied PnET-BGC to three ecosystems, including one in Oregon (The …
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Applications of Adjoint Modelling in Chemical Composition: Studies of Tropospheric Ozone at Middle and High Northern Latitudes
… of 2-3 increase in deposition rates in the northeastern U.S., decreasing the ozone bias from 17.5 ppbv to 6.0 ppbv. This analysis, however, is sensitive to the model boundary layer mixing scheme. Several inversion analyses are conducted to estimate lightning NOx emissions over North America …
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The influence of urbanization on runoff generation and stream chemistry in Massachusetts watersheds
… (r2 = 0.56) and in a compiled dataset of northeastern U.S. watersheds (r2 = 0.60; n = 158 watersheds). Hydrograph separation in an intensively-studied 3.9 km 2 catchment indicates that surface flow paths are critical to stormflow generation during rainfall events in urbanizing catchments. …
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From Providing Access To Promoting Success: Transforming A Community College System’s Advising Services
… that time, a system of community colleges in the northeastern U.S. sought to support at-risk students to academic success through a program of proactive advising delivered by professional advisors and peer mentors. This qualitative collective case study examined the experiences of peer mentors to …
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The Relationship Between Workplace Absenteeism and Alcohol Use: A Day-to-Day Examination
… in one of three large companies located in the northeastern U.S. Semi-structured interviews were used to gather information from employees on their daily use of alcohol and other drugs during a 1-month period. Employees' absenteeism and work injury data during the same target time period were …
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On a New Framework for Detecting, Classifying, and Forecasting Floods for Large-scale Flood Risk Analysis
… capabilities, extreme flood events in the Northeastern U.S. are presented as a case study. Historical streamflow data was collected for the years 1955 – 2017 for 55 stations from the U.S. Geological Survey for the Hydrological Unit Code 2 (HUC2) region. Floods are classified as days when a …
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