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Articles 1 - 11 of 11
Full-Text Articles in Social and Behavioral Sciences
Whole-Rock Lead-Lead Systematics And Major Element Analyses On The 1.85 Ga. Flin Flon Paleosol, Manitoba, Canada: Implications For Uranium Mobility., Federico Arturo Valencia
Whole-Rock Lead-Lead Systematics And Major Element Analyses On The 1.85 Ga. Flin Flon Paleosol, Manitoba, Canada: Implications For Uranium Mobility., Federico Arturo Valencia
Geosciences Theses
The 1.85 Ga Flin Flon paleosol located in Flin Flon, Manitoba, Canada, is studied with the purpose of determining the timing and geochemical trend of uranium migration. Radiometric minimum ages of sediments and paleosols indicates the presence of a post-depositional event, these ages are bracketed by the Trans-Hudson orogeny event (2155–1750 Ma) which resulted in the alteration of κ(Th/U) and µ(U/Pb) ratios by exposing volcanics to the atmosphere and instigating the mobilization of U. The profile shows that the Missi sediments lost Uby 84% average relative to corrected average upper crust value. The upper paleosol gained U by 11% and …
A Geochemical Analysis: Application Of A Chelating Agent On Potential Asr Reactive Aggregates, Jennifer N. Garcia
A Geochemical Analysis: Application Of A Chelating Agent On Potential Asr Reactive Aggregates, Jennifer N. Garcia
Geosciences Theses
Alkali Silica Reaction (ASR) is a deleterious, expansive reaction in concrete. Several ASTM methods test potential aggregates for ASR risk. One method uses NaOH digestion, followed by spectroscopic methods, to estimate the amount of reactive silica present in an aggregate. NaOH, however, can digest both crystalline (i.e. quartz) and non-crystalline (e.g. opal), or poorly crystalline silica, potentially yielding falsely high estimates of reactive silica. Studies in soil and plant sciences have used Tiron, an alkaline chelating agent (C6H4S2O8Na2), as a method of digesting opaline silica for spectroscopic analysis. Here we …
The Impact Of Local Source Sediments On Bed Texture In The Fall River, Rocky Mountain National Park, Usa, Jordan A. Clayton, Kristopher N. Eby
The Impact Of Local Source Sediments On Bed Texture In The Fall River, Rocky Mountain National Park, Usa, Jordan A. Clayton, Kristopher N. Eby
Geosciences Faculty Publications
The bed texture of a gravel-bed river is related to the size distribution and quantity of source sediments, the routing of sediment through the reach, and the distribution of flow velocity. A reach morphology that is consistent in depth with little lateral topographic variation will typically have a bed texture that is characterized by a fairly uniform grain size distribution. However, spatial variations in source sediments within a given watershed may impact the distribution of gravel-bed river sediments, even at the reach scale, such that two proximal reaches of the same river having the same general morphology can exhibit contrasting …
Stakeholders' Perceptions Of Risk For Gentrification In Atlanta's Pittsburgh Neighborhood, David C. Holmes
Stakeholders' Perceptions Of Risk For Gentrification In Atlanta's Pittsburgh Neighborhood, David C. Holmes
Geosciences Theses
The 2008-2010 foreclosure crisis and the Beltline project present two significant forces shaping neighborhoods throughout Atlanta. Both the high foreclosure rates and the promise of public and private investment create conditions for the displacement of existing residents and for the gentrification of the southwest Atlanta neighborhood of Pittsburgh in particular. Through qualitative analysis, including interviews with residents, community leaders, and government officials, the development of overlay analysis maps of Pittsburgh, as well as studying the various stakeholders' perception of risk for gentrification in Pittsburgh, this research examines how and why these stakeholders' perception of the risk of gentrification in Pittsburgh …
Assessment Of Watershed Model Simplification And Potential Application In Small Ungaged Watersheds: A Case Study Of Big Creek, Atlanta, Ga, Zoia A. Comarova Ms
Assessment Of Watershed Model Simplification And Potential Application In Small Ungaged Watersheds: A Case Study Of Big Creek, Atlanta, Ga, Zoia A. Comarova Ms
Geosciences Theses
Technological and methodological advances of the past few decades have provided hydrologists with advanced and increasingly complex hydrological models. These models improve our ability to simulate hydrological systems, but they also require a lot of detailed input data and, therefore, have a limited applicability in locations with poor data availability. From a case study of Big Creek watershed, a 186.4 km2 urbanizing watershed in Atlanta, GA, for which continuous flow data are available since 1960, this project investigates the relationship between model complexity, data availability and predictive performance in order to provide reliability factors for the use of reduced …
Critical Thresholds For Sediment Mobility In An Urban Stream, Ross H. Martin
Critical Thresholds For Sediment Mobility In An Urban Stream, Ross H. Martin
Geosciences Theses
Bed load transport measurements were made in a small urban stream in Decatur, GA, from which thresholds for motion were calculated using methodologies from the published literature. These methodologies are discussed in terms of their limitations and assumptions. Mobility frequencies were calculated for single grains of each grain size fraction to illustrate the transition from size selective transport to equal mobility. In general, urban streams behave differently than many gravel rivers in non-urban settings because of differences in the availability and character of sediment sources and altered flow hydrographs. This comparison allows for discussion about the way sediment is transported …
Spatiotemporal Analyses Of Child Pedestrian-Vehicle Incidents Occurring During School-Commuting Hours In Metro Atlanta From 2000 To 2007, Amy M. Moore
Geosciences Theses
From 2000 to 2007, the five core county area of Metropolitan Atlanta (Fulton, Dekalb, Clayton, Cobb and Gwinnett) experienced 1,871 incidents involving child pedestrians. Nearly one-third of these incidents occurred during school-commuting hours. This study examines the geospatial locations of these incidents, with regards to the location of all 647 public schools within the study area. A GIS is used to analyze the spatiotemporal arrangement of these incidents in order to find risk factors and patterns in the data. Aspects of the built environment are then considered in areas with higher frequencies of child pedestrian-vehicle incidents. A walkability assessment is …
Mineralogy And Geochemistry Of The Bauxite Deposits (Cretaceous), Wilkinson County, Georgia., Adebayo O. Ayorinde
Mineralogy And Geochemistry Of The Bauxite Deposits (Cretaceous), Wilkinson County, Georgia., Adebayo O. Ayorinde
Geosciences Theses
Cretaceous bauxite deposits from Hall and Veneer mines, Wilkinson County, Georgia are composed of kaolinite, gibbsite, goethite, anatase, nordstrandite and bohemite. Quartz and micas are absent in the samples. The presence of boehmite and goethite are evidence of intense weathering forming the bauxite deposits. The extremely high values of the Chemical Index of Alteration (CIA) which is over 99, and the low values of the alkali metals and alkali earth metals, support an intense weathering origin for the bauxite deposit. There is evidence of deposition in the mines based on the presence of pisoids in the bauxite samples and the …
Particle Size, Critical Shear Stress, And Benthic Invertebrate Distribution And Abundance In A Gravel-Bed River Of The Southern Appalachians, Helen Mayoral
Geosciences Theses
To determine the relationship between the abundance and density of benthic invertebrates, and the critical shear stress of individual grain sizes, a reach along Smith Creek, was divided into ten 2m x 2m quadrants. Within each quadrant, five randomly selected clasts for each grain size ranging from 2.26 to 25.6 cm were cleaned for benthic invertebrates. Wolman pebble counts for each quadrant were also conducted and used to determine the critical Shields stress per grain size fraction from the model given by Wiberg and Smith (1987) that explicitly accounts for particle hiding/sheltering effects in mixed-bed rivers. Particle entrainment values were …
Intensive Study Of Ambient Carbon Dioxide Variability In Urban Atlanta, Brian L. Vann Mr.
Intensive Study Of Ambient Carbon Dioxide Variability In Urban Atlanta, Brian L. Vann Mr.
Geosciences Theses
Urban areas contain multiple sources and sinks of carbon dioxide, yet spatial and temporal information explaining its variability, diurnal patterns, and effects from human activity are limited. The city of Atlanta, due to conflicting air masses, geographic location, and population growth, is as an excellent location to study carbon dioxide concentrations across its urban landscape. Mobile measurements of ambient CO2 concentrations were obtained at 1.5m above ground level along a transect in winter 2010 within the perimeter of Atlanta. Analyses of winter 2010 CO2 variability at GSU’s stationary CO2 monitor was also explored. The results showed that …
Labor Agency Beyond The Union: The Coalition Of Immokalee Workers And Faith-Based Community Organizations, Michael Husebo
Labor Agency Beyond The Union: The Coalition Of Immokalee Workers And Faith-Based Community Organizations, Michael Husebo
Geosciences Theses
Labor geographers have identified multiple strategies through which workers assert their demands in an era of global production networks. In this thesis I examine the strategic organizational actions of the Coalition of Immokalee Workers (CIW), a community-based organization representing immigrant farm-workers in southwestern Florida. Central to the successes of the CIW is its strategy to organize and embed its agency in civil society. Social actors have proved to be of vital importance as they enabled the CIW to position itself strategically in important locations of the production network to contest capitalist geographies more effectively. Using qualitative analysis of in-depth interviews …