Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Geochemistry (4)
- Crawfish (3)
- Crayfish (3)
- Louisiana (3)
- Synthesis (3)
-
- Wetlands (3)
- Antarctica (2)
- Curriculum (2)
- Forested wetlands (2)
- GUMBOS (2)
- Geometry (2)
- Gulf of Mexico (2)
- High school (2)
- High school mathematics (2)
- Hybridization (2)
- Hydroacoustics (2)
- Mississippi River (2)
- Palynology (2)
- Photochemistry (2)
- Spectroscopy (2)
- Video (2)
- 1-3 anti diols (1)
- 1-3 syn diols (1)
- 234Th as a proxy for PAHs Flux (1)
- 31P NMR (1)
- 3D printing (1)
- 3rd generation (1)
- 4d cbct (1)
- ACT (1)
- AFM (1)
Articles 121 - 137 of 137
Full-Text Articles in Entire DC Network
Fish Biomass And Community Structure Around Standing And Toppled Oil And Gas Platforms In The Northern Gulf Of Mexico Using Hydroacoustic And Video Surveys, Emily Marissa Reynolds
Fish Biomass And Community Structure Around Standing And Toppled Oil And Gas Platforms In The Northern Gulf Of Mexico Using Hydroacoustic And Video Surveys, Emily Marissa Reynolds
LSU Master's Theses
There has been relatively little study of the efficacy of decommissioned oil and gas platforms as artificial reef habitats for fish assemblages in the northern Gulf of Mexico (GOM). A variety of fish species have been reported on these structures, but the species biomass distribution and community structure has not been studied thoroughly. Hydroacoustic and video surveys were conducted quarterly from June 2013 to June 2014 at three standing and two toppled oil and gas platforms located approximately 130 km off the coast of Louisiana at 90 m depth; to gain information about the spatial biomass distribution and community structure …
Potential For Geothermal Energy In Northern Louisiana: Analysis Of The Subsurface Environment In Union And Morehouse Parishes, Tessa Shizuko Hermes
Potential For Geothermal Energy In Northern Louisiana: Analysis Of The Subsurface Environment In Union And Morehouse Parishes, Tessa Shizuko Hermes
LSU Master's Theses
Efforts to mitigate greenhouse gas emissions and reduce dependence on fossil fuels have led to renewed focus on the exploration and development of alternative energy production. One such option is hydrothermal binary geothermal energy production from geothermal reservoirs with temperatures of at least 100 °C at depths no greater than 5 km. In the U.S., such systems have the potential to provide 5,400 % of 2013 total U.S. energy consumption. This study evaluates the potential for geothermal energy systems implementation in Morehouse and Union Parishes, Louisiana, by using publicly available bottom hole temperature (BHT), mud weight (MW), logged formation top …
Z-Spectral Modeling For Magnetization Transfer Ratio Asymmetry Calculations In Chemical Exchange Saturation Transfer Mri At 3 Tesla, Ryan Nicholas Schurr
Z-Spectral Modeling For Magnetization Transfer Ratio Asymmetry Calculations In Chemical Exchange Saturation Transfer Mri At 3 Tesla, Ryan Nicholas Schurr
LSU Master's Theses
Chemical exchange saturation transfer (CEST) and magnetization transfer (MT) are types of magnetic resonance imaging (MRI) experiments in which contrast is based on the transfer of magnetization from selectively saturated solute or macromolecular protons to bulk water protons. These processes offer insight into the chemical composition of tissue and are quantified by the asymmetry of the magnetization transfer ratio (MTRasym). This study was to develop a Z-spectral curve fitting procedure based on the underlying physics of CEST-MRI from which MTRasym values can be calculated and applied to distinguish healthy tissue from cancer. Z-spectra were collected from CEST-MR images of a …
Planktonic Influence On The Toxicity Of Hewafs (High-Energy Water Attenuated Fractions), Erin Elizabeth Saal
Planktonic Influence On The Toxicity Of Hewafs (High-Energy Water Attenuated Fractions), Erin Elizabeth Saal
LSU Master's Theses
The Deep Water Horizon oilrig explosion led to the release of 6.8 ± 1.7 x 108 kg or 4.9 million barrels of petroleum hydrocarbons into the Gulf of Mexico. The spill persisted from the end of April to mid July 2010 affecting a significant portion of the Gulf coast. The effects of this spill are being studied in labs across the country, and this thesis investigated high-energy water accommodated fractions (HEWAFs) as a potential tool for use in this effort. Water accommodated fractions (WAFs) are mediums containing only the fraction of petroleum that remains in aqueous phase after a mixing …
Habitat Preferences Of Adult Spotted Seatrout, Cynoscion Nebulosus, In Lake Pontchartrain, Louisiana, Noelle Marie Bramer
Habitat Preferences Of Adult Spotted Seatrout, Cynoscion Nebulosus, In Lake Pontchartrain, Louisiana, Noelle Marie Bramer
LSU Master's Theses
Spotted seatrout (Cynoscion nebulosus) are a highly sought after sportfish, making up over 90% of the recreational fishery in Louisiana. As a significant portion of every life history stage is spent within its natal estuary, it is an ideal bio-indicator of estuarine health. As one of the largest estuaries in Louisiana, Lake Pontchartrain represents one such supporting ecosystem. From November 2012 to April 2014 acoustic tagging of individual fish, a lake-wide receiver array, and ArcGIS mapping software were utilized to determine the spatial distribution of spotted seatrout within the lake. Receivers were placed in representative locations including man-made and natural …
Site-Specific Habitat And Landscape Associations Of Rusty Blackbirds Wintering In Louisiana, Sinead Mary Borchert
Site-Specific Habitat And Landscape Associations Of Rusty Blackbirds Wintering In Louisiana, Sinead Mary Borchert
LSU Master's Theses
The Rusty Blackbird (Euphagus carolinus) has gained notoriety in recent years as one of the fastest declining North American bird species, with a global population loss of as much as 95%. Causes of the decline are not completely understood, but the high rate of forested wetland change in the southeastern United States suggests that wintering habitat degradation may be a primary driver. To better inform management on critical wintering grounds, I surveyed 68 sites in Louisiana where Rusty Blackbirds had been known to occur to address how occupancy changes with habitat type and colonization and extinction rates vary with ground …
Toxic Landscapes, Environmental Justice, And The Community: An Assessment Of Citizen Participation In Superfund Site Remediation Across Vulnerable Populations, Simone Justine Domingue
Toxic Landscapes, Environmental Justice, And The Community: An Assessment Of Citizen Participation In Superfund Site Remediation Across Vulnerable Populations, Simone Justine Domingue
LSU Master's Theses
The environmental justice movement has made progress toward unveiling environmental inequalities and addressing these inequalities through the empowerment of low-income and minority communities. Federal agencies like the EPA have incorporated environmental justice principles into their operating frameworks, with the goals of ensuring every community is treated similarly when it comes to the implementation of environmental statutes, and ensuring community members are active participants in environmental activities that affect community well-being. Community involvement at federal Superfund sites is rarely conceptualized as an event related to environmental justice despite the role it has in shaping decisions at hazardous waste sites. This study …
The Stratal Architecture Of The False River Point Bar (Lower Mississippi River, La), Alexandra Lechnowskyj
The Stratal Architecture Of The False River Point Bar (Lower Mississippi River, La), Alexandra Lechnowskyj
LSU Master's Theses
The False River point bar system is located roughly thirty miles north of Baton Rouge, LA. It is an oxbow lake cut off from the Mississippi River, and represents a large-scale modern analogue to the ancient systems of northeastern Alberta, Canada, specifically those of the Athabasca Oils Sands. While previous work has been done regarding the general architecture of a point bar, there is still omplexity associated with larger scale systems, as studies have been mostly based on small and medium-scale examples. Examination of the point bar was done through a combination of coring and geophysical logging, followed by software …
Chlorine Enrichment Of Hydrous Minerals In Archean Granulite Facies Ironstone From The Beartooth Mountains, Montana, Usa: Implications For High-Grade Metamorphic Fluids, Nicholas Michael Daigle
Chlorine Enrichment Of Hydrous Minerals In Archean Granulite Facies Ironstone From The Beartooth Mountains, Montana, Usa: Implications For High-Grade Metamorphic Fluids, Nicholas Michael Daigle
LSU Master's Theses
The amount of chlorine present in hydrous minerals influences mineral stability and may serve as a monitor of the evolving fluid phase during progressive metamorphism. Chlorine contents of amphibole and biotite vary as a function of temperature, pressure, crystallochemical factors, and fluid composition. The sensitivity of these minerals to serve as a monitor of Cl in aqueous fluids is particularly effective in Fe-rich amphibole and biotite such as those found in ironstones. Ironstones from the eastern Beartooth Mountains, Montana are typified by dominantly anhydrous mineral assemblages of quartz + magnetite + orthopyroxene + garnet ± clinopyroxene and have equilibrated during …
Distribution Of Uranium In A Black Shale Across The Shelf Of The Late Pennsylvanian Midcontinent Sea, Maxwell A. Lindaman
Distribution Of Uranium In A Black Shale Across The Shelf Of The Late Pennsylvanian Midcontinent Sea, Maxwell A. Lindaman
LSU Master's Theses
Uranium paleoredox proxies such as enrichment factors and 238U/235U ratios can be used to reconstruct redox conditions in ancient water masses on local and global scales based on the differential behavior of uranium in oxic, suboxic, and anoxic environments. Many studies have focused on black shales due to their high levels of metal enrichment and association with climactic events. However, the influence of local effects on uranium accumulation is uncertain, particularly in ancient epeiric sea environments. This study consists of two parts: an evaluation of common sequential extraction methods for U analysis (particularly the Tessier-type sequential extraction) and the application …
Dosimetric Advantages Of Personalized Phantoms For Quality Assurance And Research In Radiation Dose Measurements, Andrew Michael Halloran
Dosimetric Advantages Of Personalized Phantoms For Quality Assurance And Research In Radiation Dose Measurements, Andrew Michael Halloran
LSU Master's Theses
Background: Phantoms have been in use in medical and health physics for decades, serving as a surrogate for human tissue in several different applications. In radiation dose measurements, anthropomorphic phantoms are designed with tissue substitute materials to mimic both the elemental compositions and anatomical structures of the human body. In some cases the performance of anthropomorphic phantoms for personalized measurements is severely limited by the use of reference anatomy in the geometric design. 3D printing could potentially be used to overcome some of these shortcomings by enabling rapid fabrication of personalized phantoms for individual patients based on radiographic imaging data. …
Writing In The Geometry Classroom, Amy Lynn Rome
Writing In The Geometry Classroom, Amy Lynn Rome
LSU Master's Theses
This study sought a time-efficient way to implement writing in ninth-grade Geometry. Students wrote responses to five expository writing prompts spread out over the spring semester of the 2014-2015 school year. Students’ first attempts were graded and returned to them along with feedback in the form of a teacher-written exemplar. Students rewrote assignments to improve their grades. All first and second attempts were collected and evaluated. We found that students were more successful after seeing the exemplar. Moreover, on assignments occurring later in the semester, more students were able to score in the top categories of the writing assignments on …
Forest Stakeholders, Policies And Trade In India's Forest Sector, Joy Das
Forest Stakeholders, Policies And Trade In India's Forest Sector, Joy Das
LSU Master's Theses
The thesis examines a panel of trade flows during 2009-2013, exploring the influence of regulatory quality on the pattern of forest products imports by India from 143 partner countries. The study applies a pooled regression model followed by Generalized Least Squared (GLS) technique and a more robust Feasible Generalized Least Squared (FGLS) method of estimation with regulatory quality, distance between the partner country and India, total forest area of partner country, GDP and population indicators to assess the impact of partner country’s regulatory quality and other trade-related factors on imports of forest products by India. The results support the notion …
Impact Of Exposure To Weathered Crude Oil And Accumulation Of Pahs In Crawfish (Procambarus Clarkii), Brittany Lynn Chichester
Impact Of Exposure To Weathered Crude Oil And Accumulation Of Pahs In Crawfish (Procambarus Clarkii), Brittany Lynn Chichester
LSU Master's Theses
The number of pipelines transporting crude oil and other refined petroleum products across the U.S. has increased 15.4% from 2004 to 2013. In Louisiana, over 3,450 miles of liquid petroleum pipelines crisscross the state. In January 2013, crude oil was accidentally released from an underground pipeline into Bayou Sorrel, Louisiana. This freshwater wetland is located within the Atchafalaya River Basin which is home to large populations of wild crawfish that could be impacted by the crude oil released. This study aims to assess the potential lethal impacts that crude oil spill may have produced in adult crawfish (P. clarkii) and …
Hybridization And Population Structure Of Western Gulf Coast Mottled Ducks, Robert Joseph Ford
Hybridization And Population Structure Of Western Gulf Coast Mottled Ducks, Robert Joseph Ford
LSU Master's Theses
Rates of hybridization between species that do not normally interbreed have increased due to human impacts on natural environments, such as habitat alteration or introductions of non-native species. Human-induced hybridization can be detrimental to wildlife and contribute to species extinctions. In Florida, feral Mallards (Anas platyrhynchos) hybridize with endemic Mottled Ducks (A. fulvigula) at rates close to 9%. However, levels of hybridization between these two species have not been extensively examined in the western Gulf Coast (from Alabama to northern Mexico) despite the potential impact on the Mottled Duck lineage. In this study, I examined the degree of hybridization between …
Effect Of The Herbicide Atrazine On Phytoplankton, Water Quality, And Ecosystem Functions In Louisiana Estuaries, Alexis Victoria Starr
Effect Of The Herbicide Atrazine On Phytoplankton, Water Quality, And Ecosystem Functions In Louisiana Estuaries, Alexis Victoria Starr
LSU Master's Theses
Pesticides are used primarily for agricultural purposes in the US and while these chemicals provide many benefits, the inherent toxicity of the compounds pose a substantial risk to the environment. These chemicals may enter water bodies in areas with a high proportion of agricultural land use through surface run off, ground water discharge, and erosion, and negatively impact non-target aquatic organisms. As a result, Louisiana’s estuaries may be vulnerable to a variety of compounds, including the herbicide atrazine. Atrazine is used extensively throughout the Midwest and has been known to enter the Mississippi River through surface runoff and ground water …
The Effects Of Tropical Storms And Hurricanes On Phytoplankton And Nutrient Concentrations In Wetland-Estuary Transition Zones Along The Gulf Coast, Tiffany Chantelle Johnson
The Effects Of Tropical Storms And Hurricanes On Phytoplankton And Nutrient Concentrations In Wetland-Estuary Transition Zones Along The Gulf Coast, Tiffany Chantelle Johnson
LSU Master's Theses
Two consecutive storms made landfall along the Northern Gulf of Mexico on June and August 2012 (Tropical Storm Debby, 06/26/2012; Isaac, 08/28/2012, Category (Cat) 1 Saffir-Simpson Hurricane Scale). Each storm passed within 48 to 273 km of one of seven wetland-estuary transition zone sampling sites, and indirect storm effects associated with changes in freshwater discharge and an inflow of inorganic nutrients were observed at five of the seven sites. To assess the impacts of the 2012 hurricanes on hydrology, nutrient concentrations, and phytoplankton concentrations at transition zones along the Gulf Coast, a within-sites analysis along with a seasonal analysis were …