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2012

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Articles 16801 - 16830 of 19476

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U-Pb Geochronology Of Detrital Zircon In Quartzites Of The Sawtooth Metamorphic Complex, Sawtooth Range, Idaho, Usa, Philip Gerard Bergeron Jan 2012

U-Pb Geochronology Of Detrital Zircon In Quartzites Of The Sawtooth Metamorphic Complex, Sawtooth Range, Idaho, Usa, Philip Gerard Bergeron

LSU Master's Theses

In southwest Laurentia, the Paleoproterozoic Selway terrane has been proposed to extend as basement from the Wyoming Province to the Proterozoic rifted margin of Laurentia primarily based on limited exposures. The Sawtooth Metamorphic Complex (SMC), Idaho, a series of high-grade metasupracrustal rocks lies within the proposed region of the Selway terrane and may represent remnants of this terrane. Alternatively, it may represent another basement terrane of cratonic North America. To test the hypothesis that the SMC belongs to the Selway terrane, detrital zircon U/Pb ages of five quartzite samples were analyzed by LA-ICP-MS to establish age, possible provenance, and age …

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Assessing Effectiveness Of Concept Map As Instructional Tool In High School Biology, Ritchie Adlaon Jan 2012

Assessing Effectiveness Of Concept Map As Instructional Tool In High School Biology, Ritchie Adlaon

LSU Master's Theses

This thesis emphasizes on an alternate instructional tool called “Concept Map”. The goal of this study was to determine the effectiveness of using concept maps in improving the science achievement of 10th -grade students and compare it with a traditional approach for a Biology unit. Furthermore, the interaction of the student’s concept mapping ability and their learning gains was investigated. Both the control and the experimental groups were required to take a pre test before instruction and a posttest at the end of three weeks. The test consisting of 31 questions was used to assess learning gains on a Biology …

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Design Of Electron Dual Foil Scattering Systems For Elekta Infinity Radiotherapy Accelerators, Justin Deloy Leblanc Jan 2012

Design Of Electron Dual Foil Scattering Systems For Elekta Infinity Radiotherapy Accelerators, Justin Deloy Leblanc

LSU Master's Theses

Purpose: To design a dual foil scattering system within Elekta Infinity radiotherapy accelerator constraints that results in clinical electron beams that meet flatness criteria of ±3% (±4%) along its principal axes (diagonal axes) for the 25x25cm2 applicator and most probable surface energies of 7-20 MeV (1 MeV increments). Methods: An analytical electron dual scattering foil system simulator was commissioned and verified using Monte Carlo (MC) simulations. Verification required comparing analytical simulator with MC-calculated electron fluence profiles for identical geometries: (1) only primary foil and (2) both primary and secondary foils in the beam. Also, simulator-calculated bremsstrahlung dose was validated by …

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Evaluation Of Pleistocene To Holocene (Mis 5 To 1) Climatic Changes In Southwestern Black Sea: A Palynological Study Of Dsdp Site 380, Shannon Ferguson Jan 2012

Evaluation Of Pleistocene To Holocene (Mis 5 To 1) Climatic Changes In Southwestern Black Sea: A Palynological Study Of Dsdp Site 380, Shannon Ferguson

LSU Master's Theses

Site 380 of the Deep Sea Drilling Program [DSDP] is located in the southwestern region of the Black Sea (42°05.94’, 29°36.82’E). The location of this site is important due to its proximity to the narrow Bosphorus strait, the only present-day connection between the Black Sea and the Aegean Sea. Drops in eustatic sea level during extensive Pleistocene glacial episodes disconnected the Black Sea from the Aegean Sea at the Bosphorus strait, creating a change from brackish to freshwater within the Black Sea during these intervals. Organic-walled phytoplankton (dinoflagellate cysts, acritarchs, and fresh-water algae) are investigated to better constrain these glacio-eustatic …

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Unit Assessments For High School Geometry, Damayanthi Srimathi Jegart Jan 2012

Unit Assessments For High School Geometry, Damayanthi Srimathi Jegart

LSU Master's Theses

Abstract Eight unit tests closely aligned with the Louisiana Comprehensive Curriculum for high school geometry were developed. Five of these were administered, each to the same 115 students spanning all ability and attainment levels in a magnet school in a semi-rural Louisiana district. The results were analyzed to determine the quality of the questions as well as to glean information about student-learning. The test scores were compared to the results of the state-administered end-of-course test for high-school geometry. The main findings were as follows: a) most students do not communicate their reasoning or justification unless directed to do so, and …

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Proton Dose Calculations In Homogeneous Media, John Wesley Chapman, Jr. Jan 2012

Proton Dose Calculations In Homogeneous Media, John Wesley Chapman, Jr.

LSU Master's Theses

In this study, a proton pencil beam dose calculation algorithm was developed for a parallel, monoenergetic beam incident on a homogeneous water phantom. Fermi-Eyges theory (Eyges 1948) was used to transport pencil beams, and the characteristic width of elastic scatter events was modeled using the differential Moliere scattering power (Gottschalk 2010). The incorporation of this scattering power formalism allowed our model to account for multiple Coulomb scattering, single scattering, plural scattering, and rigorously accounted for material effects on scatter. Nonelastic nuclear interactions were incorporated into an additional pencil beam model. The attenuation of primary fluence due to nuclear events was …

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The Role Of Managers Within The Welfare System: How Race And Negative Stereotypes About Clients Affect Managers' Tolerance Of Caseworker Discretion, Alethia Marie Picciola Jan 2012

The Role Of Managers Within The Welfare System: How Race And Negative Stereotypes About Clients Affect Managers' Tolerance Of Caseworker Discretion, Alethia Marie Picciola

LSU Master's Theses

Previous research studies found differences in social welfare policy implementation based on the racial and ethnical differences of clients, workers, and managers. The public perception of welfare recipients being content with living on government money and unmotivated to become self-sufficient is a central theme throughout American culture. The current study examined whether parish-level managers’ personal beliefs about their clients are associated with their tolerance of frontline staff’s discretionary practices. Additionally, the author examined the role that the race of managers plays in the personal beliefs they hold about their clients as well as their tolerance of frontline discretion. This study …

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Measurement Of The Differential Cross Section Dσ/Dt In Elastic Pp- Scattering At √S = 1.96 Tev, David Hedin Jan 2012

Measurement Of The Differential Cross Section Dσ/Dt In Elastic Pp- Scattering At √S = 1.96 Tev, David Hedin

Faculty Articles, Papers, and Other Scholarship

We present a measurement of the elastic differential cross section dσ( pp-→ pp-)/dt as a function of the four-momentum-transfer squared t. The data sample corresponds to an integrated luminosity of ≈ 31 nb-1 collected with the D0 detector using dedicated Tevatron pp- Collider operating conditions at √s = 1.96 TeV and covers the range 0.26 < │t │ < 1:2 GeV2. For │t│< 0.6 GeV2, dσ/dt is described by an exponential function of the form Ae-b│t│with a slope parameter b = 16.86 ± 0.10(stat) ± 0.20(syst) GeV-2. A change in slope is observed at │t│≈ 0.6 GeV2, followed by a more gradual │t│ dependence with increasing values of │t│.

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Combination Of The Top Quark Mass Measurements From The Tevatron Collider, David Hedin Jan 2012

Combination Of The Top Quark Mass Measurements From The Tevatron Collider, David Hedin

Faculty Articles, Papers, and Other Scholarship

The top quark is the heaviest known elementary particle, with a mass about 40 times larger than the mass of its isospin partner, the bottom quark. It decays almost 100% of the time to a W boson and a bottom quark. Using top-antitop pairs at the Tevatron proton-antiproton collider, the CDF and D0 Collaborations have measured the top quark’s mass in different final states for integrated luminosities of up to 5.8 fb-1. This paper reports on a combination of these measurements that results in a more precise value of the mass than any individual decay channel can provide. It describes …

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The Spatial-Temporal Dynamics Of China’S Changing Urban Hierarchy (1950–2005), Xuwei Chen, Richard Greene Jan 2012

The Spatial-Temporal Dynamics Of China’S Changing Urban Hierarchy (1950–2005), Xuwei Chen, Richard Greene

Faculty Articles, Papers, and Other Scholarship

This paper examines the dynamic spatial and temporal patterns of China’s urban hierarchy from 1950 to 2005. We limit the study to mainland China’s 137 urban agglomerations of 750,000 or more population as of 2005. The paper improves upon a classic approach to measuring shifting ranks within an urban hierarchy by applying advanced spatial analysis techniques. We use a Getis-Ord G∗ i , a space-timeMoran scatter plot, and dynamic LISA paths to examine the regional difference and change for these urban agglomerations. Our study revealed a north-south divide in the changing urban hierarchy of China after 1990. The analysis demonstrated …

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Glacial Deposits, Vol. 40, 2011-2012, Department Of Geography-Geology Jan 2012

Glacial Deposits, Vol. 40, 2011-2012, Department Of Geography-Geology

Glacial Deposits

Newsletter of the Department of Geography-Geology

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Variations In Pore Water Salinities Above And Below Allochthonous Salt Sheets In The Deepwater Gulf Of Mexico: Implications For Mechanisms Of Solute Transport, Miles Alexander Mccammon Jan 2012

Variations In Pore Water Salinities Above And Below Allochthonous Salt Sheets In The Deepwater Gulf Of Mexico: Implications For Mechanisms Of Solute Transport, Miles Alexander Mccammon

LSU Master's Theses

Spatial variations in salinity of pore waters in marine sediments provide useful information on processes and rates of subseafloor fluid flow and solute transport, particularly if there are evaporites in the section. Pore water salinities were determined for 18 drill holes which penetrated allochthonous salt bodies in 12 widely-scattered protraction blocks on the Louisiana offshore continental shelf and slope. Salinities were calculated from Log ASCII Standard-Logging While Drilling (LAS-LWD) logs using the Revil et al. (1998) dual-conductivity technique. The sites represent a wide range of field settings. Water depths range from 30 to 1990 m, depths to the top of …

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Improving Middle School Math Achievement Using A Web-Based Program And Extended Written Tasks, Sarah Claire Dyer Jan 2012

Improving Middle School Math Achievement Using A Web-Based Program And Extended Written Tasks, Sarah Claire Dyer

LSU Master's Theses

This thesis outlines a dual-intensity approach using a web-based program, MyMathLab, for procedural fluency and, in parallel, extended written tasks for helping students improve their reasoning skills, to learn to use multiple representations, and securing mathematical knowledge. The new Common Core State Standards have increased expectations and achievement goals at all grade levels, the required changes being most significant at earlier grade levels (in elementary and middle schools). It is my assertion that a combined approach, one that encompasses both procedure-oriented practice for fluency and extended written tasks designed to stretch thinking and reasoning is needed to meet these goals.

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A Seismic Attribute Study To Assess Well Productivity In The Ninilchik Field, Cook Inlet Basin, Alaska, Andrew Sampson Jan 2012

A Seismic Attribute Study To Assess Well Productivity In The Ninilchik Field, Cook Inlet Basin, Alaska, Andrew Sampson

LSU Master's Theses

Coal bed methane which has formed in the Tertiary Kenai Group strata has been produced from the Ninilchik field of Cook Inlet, Alaska since 2001. Ninilchik field is located on the eastern margin of the central Cook Inlet along the Kenai Peninsula. Cook Inlet is a forearc basin and is characterized by northeast trending anticlines with upwards of 10,000 feet of Late Oligocene and younger, non-marine sediments. Highly variable well production within the Oligocene to Miocene Tyonek formation of the Kenai Group has been a source of uncertainty. A series of seismic attributes visualized in Schlumberger's Petrel® software were studied …

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Biomass And Mass Balance Isotope Content Of Mussel Seep Populations, Philip Martin Riekenberg Jan 2012

Biomass And Mass Balance Isotope Content Of Mussel Seep Populations, Philip Martin Riekenberg

LSU Master's Theses

Cold seep mussels, Bathymodiolus childressi, are common cold seep constituents that form large populations at upper continental slope (500-1000 m) cold seep sites in the Northern Gulf of Mexico. These mussels utilize methane present through symbiotic relationships with methanotrophic bacteria. This study uses a coupled isotope technique to determine the relative incorporation of respiratory carbon in the shell as a measure of the availability of methane between different seep sites. This method indicates a higher abundance of methane at the Brine Pool site than at the Bush Hill site which appears significantly more resource limited and that changes in methane …

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Implications Of Geothermal History On Microbial Gas Generation And Coalbed Methane Production In The Ninilchik Field, Cook Inlet Basin, Alaska, Eric M. Hart Jan 2012

Implications Of Geothermal History On Microbial Gas Generation And Coalbed Methane Production In The Ninilchik Field, Cook Inlet Basin, Alaska, Eric M. Hart

LSU Master's Theses

Coalbed methane (CBM) production operations atop the Ninilchik anticline of Cook Inlet, Alaska pose intriguing questions regarding the nature of biogenic gas generation in a thermally complex forearc basin setting. This thermal complexity stems, in part, from its up to 30,000 ft thick Tertiary section, comprised of braided stream alluvium and expansive, interbedded coal deposits. Rapid accumulation of cold, glacial strata is documented as being capable of regionally suppressing the elevated heat flux values expected within a forearc basin. In addition, beds with high organic content, such as the coal layers, act as natural insulators from basinal heat flux and …

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Simulations Of The Primary Cement Placement In Annular Geometries During Well Completion Using Computational Fluid Dynamics (Cfd), Muhammad Zulqarnain Jan 2012

Simulations Of The Primary Cement Placement In Annular Geometries During Well Completion Using Computational Fluid Dynamics (Cfd), Muhammad Zulqarnain

LSU Master's Theses

Effective zonal isolation during primary cementing is only possible when drilling mud in the annulus is completely displaced with cement, while the spacers aid in this process. During the displacement process the rheological properties of fluids used and the operating conditions control the motion of different fluids interfaces; desired stable interfacial displacement leads to piston like motion. Computational Fluid Dynamics (CFD) tool with the Volume-of-Fluid (VOF) has been validated against experimental and used to conduct numerical experiments in a virtual well model consisting of 50 ft vertical section of 8.765" x 12.5" annulus having initially mud and this mud is …

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Consensusability Of Discrete-Time Multi-Agent Systems, Abhishek Pandey Jan 2012

Consensusability Of Discrete-Time Multi-Agent Systems, Abhishek Pandey

LSU Master's Theses

The study of multi-agent systems (MAS) focuses on systems in which many intelligent agents interact within an environment. The agents are considered to be autonomous entities. MAS can be used to solve problems that are difficult or impossible for an individual agent to solve. The main feature which is achieved when developing MAS, if they work, is flexibility, since MAS can be added to, modified and reconstructed, without the need for detailed rewriting of the application. MAS can manifest self-organization as well as self-steering related complex behaviors even when the individual strategies of all their agents are simple. The goal …

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Palynostratigraphy Of The Umir Formation, Middle Magdalena Valley Basin (Mmvb) Colombia, Carlos Enrique Santos Jan 2012

Palynostratigraphy Of The Umir Formation, Middle Magdalena Valley Basin (Mmvb) Colombia, Carlos Enrique Santos

LSU Master's Theses

The Late Cretaceous Umir Formation in Middle Magdalena Valley Basin (MMVB) was recently acknowledged as a new target. However, there is little known about the regional distribution of the Umir Formation since it is affected by structural complexity and a major regional unconformity. To improve biosteering of the Umir Formation and reduce exploratory risks, a detailed biostratigraphic analysis of the Umir Formation in the MMVB is presented. Eighty samples from four cores drilled in the Central Eastern MMVB were analyzed for palynological content. These cores represent 976.6 meters of the Middle to Upper Umir Formation. The sediment yielded a good …

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Monitoring The Molecular Weight Of Poly(Lactic Acid) During Fiber Spinning And Coloration, Ashley Nicole Jacobs Jan 2012

Monitoring The Molecular Weight Of Poly(Lactic Acid) During Fiber Spinning And Coloration, Ashley Nicole Jacobs

LSU Master's Theses

One fiber that is being researched as a possible alternative to the petroleum based polyester fibers currently being used is polylactic acid (PLA). Being aware of the low heat resistance and degradation of PLA during processing is a concern for practical production and the performance of the polymer. Disperse dyed PLA film and solution dyed PLA film, along with un-dyed film and the original PLA pellets have been investigated to determine molecular weight. Infrared analysis has been conducted to examine the compounds found in the PLA samples at different steps in the polymer processing. Un-dyed PLA samples have been subjected …

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Pah Concentrations Found Within Gulf Menhaden (Brevoortia Patronus) Populations Located Off Of The South/Southeast Coast Of Louisiana, Gregory Michael Olson Jan 2012

Pah Concentrations Found Within Gulf Menhaden (Brevoortia Patronus) Populations Located Off Of The South/Southeast Coast Of Louisiana, Gregory Michael Olson

LSU Master's Theses

In April 2010, large quantities of crude oil were released into the Gulf of Mexico (GoM) raising questions about the possible contamination of marine organisms with constituents of concern known as Polycyclic Aromatic Hydrocarbons (PAHs). In order to determine the impact of the Deepwater Horizon (DWH) crude oil spill, Gulf menhaden (Brevoortia patronus) were harvested from two coastal regions of Louisiana. Tissue analysis to determine total PAH concentration was conducted using an adapted matrix solid phase dispersion (MSPD) method; a Soxhlet extraction process was used to determine fish oil to mass ratios for “small” (fork length < 16 cm) and “large” (fork length > 16 cm) menhaden. Menhaden …

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Measuring City Commitment To Climate Change Mitigation, Kelsey Wefer Clinton Jan 2012

Measuring City Commitment To Climate Change Mitigation, Kelsey Wefer Clinton

LSU Master's Theses

An increasing number of cities are focusing on sustainability and climate change mitigation by joining groups such the International Council for Local Environmental Initiatives (ICLEI). ICLEI uses a five-step milestone process to help cities achieve their mitigation goals. These milestones include conducting a greenhouse gas inventory, setting reduction targets, creating a Climate Action Plan, and implementing and monitoring that plan. Prior studies have examined factors that may influence a city’s decision to join ICLEI, but few have looked at how committed the cities are to sustainability and to ICLEI itself after joining the organization. The purpose of this study is …

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Reductive Dechlorination Of High Concentrations Of 1,2-Dichloroethane, 1,2-Dichloropropane, And 1,1,2-Trichloroethane By Dehalogenimonas Sp., Andrew D. Maness Jan 2012

Reductive Dechlorination Of High Concentrations Of 1,2-Dichloroethane, 1,2-Dichloropropane, And 1,1,2-Trichloroethane By Dehalogenimonas Sp., Andrew D. Maness

LSU Master's Theses

The research goals presented here were to evaluate the solvent concentrations over which Dehalogenimonas lykanthroporepellens strain BL-DC-9T and Dehalogenimonas sp. IP3-3 are able to reductively dechlorinate 1,2-dichloroethane (1,2-DCA), 1,2-dichloropropane (1,2-DCP), and 1,1,2-trichloroethane (1,1,2-TCA). Both of these novel bacteria were isolated from contaminated groundwater at the PetroProcessors of Louisiana, Inc. Superfund site located near Baton Rouge. Both cluster in the phylum Chloroflexi, related to, but distinct from, the widely studied, reductively dechlorinating “Dehalococcoides” strains .

Although previous research demonstrated that strains BL-DC-9T and IP3-3 are able to reductively dechlorinate a variety of polyhalogenated alkanes, the solvent concentration at which the strains …

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Impact Of Lean Production On Workers' Exposure To Risk In Modular Home Building Manufacturing, Joel James Jan 2012

Impact Of Lean Production On Workers' Exposure To Risk In Modular Home Building Manufacturing, Joel James

LSU Master's Theses

The construction industry records the highest number of work-related injuries and fatalities in the United States according to the Bureau of Labor Statistics. Workers’ exposure to risk may be affected by implementing Lean concepts. This study describes the effects on worker’s safety environment after a Kaizen event, a Lean tool, conducted in three workstations within a modular home manufacturer: base-framing, sheet-rock hanging, and painting. The effects of Lean on safety hazards at each of the three workstations were determined by conducting a Job Safety Analysis (JSA) before and after each Kaizen. Based on the JSAs a risk assessment tool (questionnaire) …

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The Biomechanics Of Salt Marsh Vegetation Applied To Wave And Surge Attenuation, James Chatagnier Jan 2012

The Biomechanics Of Salt Marsh Vegetation Applied To Wave And Surge Attenuation, James Chatagnier

LSU Master's Theses

The Northern coast of the Gulf of Mexico is threatened by storm surge and waves from tropical storms. It has been long known that marsh vegetation attenuates storm surge and waves and is vital for sustaining marsh edges. However, little is known about the relationship between plant properties and the amount of storm surge and wave reduction the plants provide. In order to better understand the stiffness properties and physical dimensions of saltmarsh vegetation, which are directly related to their ability to attenuate waves and storm surge, this study has been conducted. Stiffness of salt marsh vegetation was determined through …

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Effects Of Varying Land Use On Headwater Stream Fish Assemblages And In-Stream Habitats In Southwestern Louisiana, Alexandra Marie Fitzgerald Jan 2012

Effects Of Varying Land Use On Headwater Stream Fish Assemblages And In-Stream Habitats In Southwestern Louisiana, Alexandra Marie Fitzgerald

LSU Master's Theses

Although watershed land use effects on in-stream fish habitat and fish-macrohabitat associations have been widely studied in the past, low-gradient, coastal Louisiana streams have been poorly described in the literature. In this thesis, I report the results of a two-year study exploring relationships among regional land use, in-stream physical habitat, and headwater stream fish assemblages. In chapter two, I examined in-stream habitat variables such as depth, flow, and substrate combined with three-pass electrofishing depletion estimates at thirteen 100-m stream sites. I used a combination of principle component analysis and structural equation modeling to determine if trends were present in the …

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Determining Impact: Using Formative Evaluation In A Professional Development Program For Teachers Of Mathematics And Science, Tiah B. Alphonso Jan 2012

Determining Impact: Using Formative Evaluation In A Professional Development Program For Teachers Of Mathematics And Science, Tiah B. Alphonso

LSU Master's Theses

The purpose of this study was to evaluate a professional development (PD) program for middle and high school teachers of mathematics and science which is funded by a $5 million National Science Foundation grant. The evaluation was internal and formative in nature and took place in two separate phases. The focus of the evaluation was not only on program improvement but also to extend the body of existing knowledge in the area of teacher professional development. Both the needs of project stakeholders and the findings of previous research in the areas of professional development and program evaluation were drawn on …

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Drinking With Friends: A Cellular Automata Approach To Modeling Peer Influence On Binge Drinking Behavior, Piper Jackson, Andrew Reid, Niki Huitson, Kathryn Wuschke, Vahid Dabbaghian Jan 2012

Drinking With Friends: A Cellular Automata Approach To Modeling Peer Influence On Binge Drinking Behavior, Piper Jackson, Andrew Reid, Niki Huitson, Kathryn Wuschke, Vahid Dabbaghian

Criminology and Criminal Justice Faculty Publications and Presentations

In this project, we adopt Cellular Automata (CA) modeling as a means to focus solely on the elements of concern: individual state (binging) and local interactions (peer pressure). CA models are well suited for exploring the dynamics that occur within a population, and are useful for visualizing the clustering behaviour of communities. With this more abstract approach, it is possible to simulate large populations with reasonable computational requirements.

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Efficient Finite Element Modeling Of Reinforced Concrete Columns Confined With Fiber Reinforced Polymers, Dan Hu Jan 2012

Efficient Finite Element Modeling Of Reinforced Concrete Columns Confined With Fiber Reinforced Polymers, Dan Hu

LSU Master's Theses

Fiber reinforced polymer (FRP) composites have found extensive applications in the field of Civil Engineering due to their advantageous properties such as high strength-to-weight ratio and high corrosion resistance. This study presents a simple and efficient frame finite element (FE) able to accurately estimate the load-carrying capacity and ductility of reinforced concrete (RC) circular columns confined with externally bonded fiber reinforced polymer (FRP) plates and/or sheets. The proposed FE considers distributed plasticity with fiber-discretization of the cross-sections in the context of a force-based (FB) formulation. The element is able to model collapse due to concrete crushing, reinforcement steel yielding, and …

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Low-Order Modeling Of Micro-Flier Impact With Thin Stationary Energetic Targets, Mark B. Fry Jan 2012

Low-Order Modeling Of Micro-Flier Impact With Thin Stationary Energetic Targets, Mark B. Fry

LSU Master's Theses

The impact of high-speed (500-1500 m/s), laser driven micro-fliers with thin energetic targets (10-100 &# 956;m) is being examined to characterize impact-induced heating and combustion of these materials. Aluminum fliers are propelled by a laser into a thin metallic target plate having a layer of energetic material deposited on its backside. Mass spectrometry is performed in vacuo on the energetic side to interrogate the shock-induced chemistry of the energetic material. It is important to ignite and possibly detonate the energetic material without perforation of the target plate avoiding contamination of the vacuum chamber. To guide development of these experiments, a …

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