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Articles 1 - 30 of 69
Full-Text Articles in Physical Sciences and Mathematics
The Impact Of Virtual Simulations On Student Comprehension Of Mechanics, Ann Sanchez Couch
The Impact Of Virtual Simulations On Student Comprehension Of Mechanics, Ann Sanchez Couch
LSU Master's Theses
The use of technology in classrooms has become an increasing trend throughout all levels of education. Often times, teachers are left to figure out how to incorporate the many different types of available technologies into their lessons. This study examines the use of one specific type of technology in the classroom: computer simulations, specifically the impact of virtual lab simulations on student understanding of mechanics concepts. In this study, the experimental group and the control group received identical instruction in the form of lectures, practice problems, homework, and tests. The difference between the two groups was the use of virtual …
Modeling Near Surface, Gas-Induced Seafloor Deformation Using Thin Plate Mechanics In The Thunder Horse Oil Field, Gulf Of Mexico And Ninilchik Field, Cook Inlet Basin, Alaska, Michael I. Thoma
LSU Master's Theses
Seabed topographic expressions such as pockmarks and domes caused by the vertical migration and accumulation of methane are found in muddy, cohesive sea beds around the world. These surface features range from 10-1000 m in diameter and 1-20 m in relief (Judd and Hovland, 2007). The mechanics of soft, cohesive sediment deformation due to overpressure from rising gas is not well understood or quantitatively defined despite the hazards they present to offshore drilling. Shallow gas pockets and overpressured sediments formed by the migration of subsurface gas to the seafloor can cause drilling blowouts, resulting in the release of large amounts …
Variations In Salinity And Temperature On The Flank Of An Offshore Louisiana Salt Structure, Candice M. Mccollum
Variations In Salinity And Temperature On The Flank Of An Offshore Louisiana Salt Structure, Candice M. Mccollum
LSU Master's Theses
Sediments located in the vicinity of salt structures in the northern Gulf of Mexico have highly complex structures and fluid dynamics associated with the dissolution and diapirism of salt. Past studies (Lin and Nunn, 1997; Bruno and Hanor, 2003; Richards, 2013) have shown that faults associated with salt structures can act both as migration pathways and barriers to the flow of formation waters. Bruno and Hanor (2003), Steen et al. (2011), and Richards (2013) also demonstrated that lithology was a controlling factor in the flow of formation waters. In this study, two sets of wireline logs, one used in salinity …
An Efficient Approach To Epid Transit Dosimetry, Bart Alan Morris
An Efficient Approach To Epid Transit Dosimetry, Bart Alan Morris
LSU Master's Theses
Introduction: In order to maintain uniform standards in the accuracy of fractionated radiation therapy, quantification of the delivered dose per fraction accuracy is required. The pupose of this study was to investigate the feasibility of a transit dosimetry method using the electronic portal imaging device (EPID) for dose delivery error detection and prevention. Methods and Materials: In the proposed method, 2D predicted transit images were generated for comparison with online images acquired during treatment. Predicted transit images were generated by convolving through-air EPID measurements of each field with pixel-specific kernels selected from a library of pre-calculated Monte Carlo pencil kernels …
Does Exploring Non-Linear Models Address High School Students' Misconceptions Of Linearity And Rate Of Change?, Kailyn Brabham
Does Exploring Non-Linear Models Address High School Students' Misconceptions Of Linearity And Rate Of Change?, Kailyn Brabham
LSU Master's Theses
Previous studies have shown that students at all levels—elementary, secondary and post-secondary—tend to apply linear reasoning in mathematical problems where non-linear models are needed. They rely on proportionality and linear equations without paying attention to the problem features needed for an accurate model. In the present study, students were taught using an activity-inspired by modeling curricula. In a hands-on activity, they explored the rate of change of linear and nonlinear functions that arise in describing elastic materials, recording average rates of change and noting key graphical features. This led them to articulate the relationship between nonlinear models, local linearity and …
Predicted Risk Of Post-Irradiation Cerebral Necrosis In Pediatric Brain Cancer Patients: A Treatment Planning Comparison Of Proton Therapy Vs. Photon Therapy, Derek Freund
LSU Master's Theses
Purpose: To predict the risk of radiation necrosis in a cohort of pediatric patients with glioma and ependymoma and compare the predicted risk between volumetric modulated arc photon therapy (VMAT), passively scattered proton therapy (PSPT) and intensity modulated proton therapy (IMPT). Methods: Thirteen pediatric patients with varying age and sex were selected for this study. A radiation oncologist contoured a clinical treatment volume (CTV) on 8 patients selected for glioma in the cerebral hemisphere and 5 with ependymoma located in the posterior fossa. A 1 cm margin was added to the CTV to define the planning treatment volume (PTV). VMAT …
Assessment Of Habitat Quality For Red Snapper, Lutjanus Campechanus, In The Northwestern Gulf Of Mexico: Natural Vs. Artificial Reefs, Brittany Dawn Schwartzkopf
Assessment Of Habitat Quality For Red Snapper, Lutjanus Campechanus, In The Northwestern Gulf Of Mexico: Natural Vs. Artificial Reefs, Brittany Dawn Schwartzkopf
LSU Master's Theses
Habitat quality of natural and artificial reefs for red snapper (Lutjanus campechanus) in the northwestern Gulf of Mexico (Gulf) is important as this area is home to the majority of the Gulf’s artificial reef system, in the form of oil and gas platforms, in addition to the largest extent of high vertical relief natural habitat. This study sought to assess habitat quality of natural reefs of varying habitat complexity and an artificial reef complex located on the LA continental shelf. Habitat quality was assessed by comparing red snapper diets and foraging patterns, and nutritional condition using the liver-somatic index (LSI) …
Damage Evolution In Pressurized Domain: A Gradient Based Variational Approach, Navid Mozaffari
Damage Evolution In Pressurized Domain: A Gradient Based Variational Approach, Navid Mozaffari
LSU Master's Theses
Construction of appropriate models through mathematical analysis for materials in order to find their main properties and ingredients and enhance the numerical simulations to predict their behavior under specific conditions is in interest even in mathematics departments rather than material science and engineering branches. Among these models, gradient damage models have reached to the specific stage because of their ability to bring the effects of micro cracks propagation into conventional continuum mechanics formulation and approximate brittle fracture as one of the most phenomena in the area of material behavior simulation. This thesis includes the application and extension of a previously …
Legacy Phosphorus Implications In The Lake Pontchartrain Estuary Sediment Due To The 2011 Bonnet Carre Spillway Opening, Nhan Thanh Nguyen
Legacy Phosphorus Implications In The Lake Pontchartrain Estuary Sediment Due To The 2011 Bonnet Carre Spillway Opening, Nhan Thanh Nguyen
LSU Master's Theses
Phosphorus (P) is an essential nutrient for life and excess P in aquatic systems can trigger algal blooms. Nutrient-rich Mississippi River water is diverted into the Lake Pontchartrain estuary (LPE) periodically through the Bonnet Carré Spillway (BCS) to avoid downstream flooding to the city of New Orleans, Louisiana and can significantly increase the internal P load in the sediment. A sequential P fractionation procedure was performed on sediments collected before the opening and after the closing of the 2011 BCS operation to understand the role of these large river diversions on P dynamics. Before the 2011 BCS opening, 10,368 Mt …
Oxygen Isotope Composition Of Phosphate Along Vertical Weathering Profiles That Developed On Igneous Rocks: Testing Modern Analogues For Identifying Terrestrial Life In Ancient Paleosols, Dustin Warn Boyd
LSU Master's Theses
Life on Earth began in its early oceans before moving on to land. Determining the exact timing of an established biosphere on land, however, has been elusive, due largely to the lack of either fossil or chemical evidence on land deposits. Here I test a hypothesis that the activity of land biota can be recorded in the oxygen isotope composition of phosphate in weathering profiles developed on igneous parent rocks. Igneous rock contains phosphate (PO43-), which is readily utilized for biological activities during soil development. The oxygen in PO43- does not readily exchange its oxygen …
Does The Jigsaw Method Improve Student Conceptual Knowledge In Physical Science?, Althea Alisa Morgan
Does The Jigsaw Method Improve Student Conceptual Knowledge In Physical Science?, Althea Alisa Morgan
LSU Master's Theses
ABSTRACT The goal of my research is to determine if the Jigsaw Method has an effect on student conceptual knowledge of Physical Science in a classroom setting that predominately uses cooperative learning. The assessment instruments that were given in pretest and posttest format to assess student knowledge were the Matter Concept Inventory (MCI) and Edusoft Assessments. The research study group consisted of two sections of a ninth grade Physical Science class (N = 42) in a rural high school in Louisiana. As an intervention prior to the study, students were introduced to working in cooperative learning groups. The students in …
Teaching Complex Numbers In High School, Esperanza Gotoman Chavez
Teaching Complex Numbers In High School, Esperanza Gotoman Chavez
LSU Master's Theses
One of the mathematics standards for high schools stated in the Common Core State Standards Initiative (CCSS, 2010 Appendix A, p. 60) is the understanding of the Complex Number system, performing arithmetic operations with complex numbers, representing complex numbers and their operations on the complex plane, and using complex numbers in polynomial identities and equations. In this thesis, we trace back the history of complex numbers and formulate a set of problems based on the history. The thesis gives a description of the Common Core standards and goals. The exercises based on the history of complex numbers are shown to …
A Treatment Planning Comparison Of Volumetric Modulated Arc Therapy And Proton Therapy For A Sample Of Breast Cancer Patients Treated With Post-Mastectomy Radiotherapy, Margaret Hernandez
A Treatment Planning Comparison Of Volumetric Modulated Arc Therapy And Proton Therapy For A Sample Of Breast Cancer Patients Treated With Post-Mastectomy Radiotherapy, Margaret Hernandez
LSU Master's Theses
Purpose: The delivery of post-mastectomy radiotherapy (PMRT) can be challenging for patients with left-sided breast cancer due to the planning target volume (PTV) size and proximity to critical organs. This study investigates the use of protons, both passively scattered (PS) and intensity modulated proton therapy (IMPT), for PMRT in a clinically-representative cohort of patients, and quantitatively compares the predicted outcomes of volumetric modulated photon arc therapy (VMAT) to those of proton therapy to develop an evidence-based rationale for selecting a treatment modality for PMRT patients. Methods: Eight left-sided PMRT patients previously treated at our clinic with VMAT were included in …
Teaching Strategies For Proof Based Geometry, Kristina Marie Chaves
Teaching Strategies For Proof Based Geometry, Kristina Marie Chaves
LSU Master's Theses
This study aims is to discover the best methods for geometry students to master proof writing. Students who are taught how to write proofs in a traditional setting find proofs to be very difficult - struggling throughout the school year writing proofs on their own. Studies have been conducted regarding the use of dynamic geometry software in proof writing. To further study the effects of proof writing using dynamic geometry software, forty-eight freshmen students enrolled in an honors geometry course at a high performing suburban high school in Louisiana were given several proofs to complete, along with self-reflection surveys. During …
Teaching Climate Literacy Using Geospatial Tools, Steven L. Babcock
Teaching Climate Literacy Using Geospatial Tools, Steven L. Babcock
LSU Master's Theses
Antarctica is the world’s coldest, driest and windiest continent. It is a harsh environment that few people will ever see but it is a very important part of our Earth system. Over the past 34 million years the climate in Antarctica has deteriorated from one that supported lush vegetation to the conditions observed today. By studying this trend and the associated changes to ice and vegetation we can gain critical insight into climate changes taking place today. This thesis presents three pieces of curricula that will help students and the general public understand some of the research currently underway in …
A Comparison Of Capacity For Resilience Among Coastal Communities In The Northeast U.S. And The Northern Gulf Of Mexico Region, Emily Gootee
A Comparison Of Capacity For Resilience Among Coastal Communities In The Northeast U.S. And The Northern Gulf Of Mexico Region, Emily Gootee
LSU Master's Theses
Coastal communities face many threats from their surrounding environment, including floods and severe storms. These threats are exacerbated by climate change and sea level rise, which may cause increased frequency and severity of these events. Despite these hazards, population density along the coasts continues to rise. These areas of dense population and infrastructure are highly vulnerable to extreme weather events. Hurricane Sandy of 2012 was a powerful demonstration of the impact that severe storms can have on coastal populations. In the face of this reality, coastal communities must adapt and become more resilient to environmental changes. In order to assess …
The Adoption Of State Wetland Policies: How Do Wetlands Fit Within The Theoretical Framework Of Environmental Policy Determinants?, Rachel Bogart Krech
The Adoption Of State Wetland Policies: How Do Wetlands Fit Within The Theoretical Framework Of Environmental Policy Determinants?, Rachel Bogart Krech
LSU Master's Theses
Wetlands are an extremely important natural resource in the United States. They offer storm surge protection, sediment stabilization, groundwater recharging, carbon sequestration, and habitat for many species. Despite their values, wetlands have a long history of being misunderstood. It was not until the mid-1970s that scientific understanding helped transform policy from that of rapid conversion to that of conservation. By this time, the lower 48 states had already lost 53 percent of its total wetlands. The nature of wetlands and federal limitations make the management of this natural resource a primarily state-based responsibility. However, the way that states construct their …
A Toolkit For Tracking And Mediating Parametric Objects Upon Commodity Mobile Devices, Shantanu Thatte
A Toolkit For Tracking And Mediating Parametric Objects Upon Commodity Mobile Devices, Shantanu Thatte
LSU Master's Theses
The large number of mobile devices introduced in the market in recent years provide numerous interaction opportunities. We used commercially available products to create an interface for interaction with diverse datasets. We extended this scenario to include multiple physical instances, realizing a real-time multi-party interaction session. Tangibles act as tools and containers, in a fashion that requires their physical location and orientation to be evaluated continuously during a session. We present a technique to detect an object using only the touchscreen of a mobile device as an input, by means of touch patterns created on the screen. This helps avoid …
The Effects Of Modeling Instruction In A High School Physics Classroom, Mark E. Arseneault
The Effects Of Modeling Instruction In A High School Physics Classroom, Mark E. Arseneault
LSU Master's Theses
The purpose of this research was to study my effectiveness as a high school physics teacher using a traditional approach to instruction compared to a Modeling approach. The study was conducted at a high school near Baton Rouge, Louisiana. Both groups consisted of 1 section of honors physics and 1 section of regular physics each. Conceptual understanding and problems solving gains were measured using pre/post Force Concept Inventory (FCI) and the Mechanics Baseline Test (MBT) results, respectively. Students’ level of science reasoning was also measured at the beginning of the school year only, using the Classroom Test of Scientific Reasoning …
Habitat Associations Of Lower Mississippi River Floodplain Fishes On St. Catherine Creek National Wildlife Refuge, Alonda Mccarty
Habitat Associations Of Lower Mississippi River Floodplain Fishes On St. Catherine Creek National Wildlife Refuge, Alonda Mccarty
LSU Master's Theses
Each year, floodplain habitats are inundated and dewatered throughout the lower Mississippi River during the flood pulse. Many organisms, particularly fishes, are facultative or obligate users of inundated floodplain habitats for foraging and reproduction. The abundance and distribution of these fishes are influenced by annual floods, ranging from weeks to months depending on intensity and duration of the pulse. One major consequence of anthropogenic alterations to the river has been the sequential loss of connectivity of floodplain habitats. In light of these changes, a concentrated effort has been made to restore the integrity of the LMR floodplain. An integral part …
Tube Current Modulated Computed Tomography Effective Dose And Size Specific Organ Dose Estimates With Impact: Total Scan Versus Slice By Slice Parameters For Urogram Protocols, David Wayne Byrd
LSU Master's Theses
Purpose: One of the predominant computed tomography (CT) dosimetry estimation programs, ImPACT, was not designed to estimate organ absorbed dose or effective dose for modern tube current modulated-CT (TCM-CT). ImPACT also only estimates organ doses for a standard adult hermaphrodite mathematical phantom, not for a specific patient. Two methods for calculating size specific TCM-CT organ absorbed dose and non-size dependent TCM-CT effective dose were developed and compared with conventional dose estimation methods. Methods: A sample of 48 TCM-CT urogram procedures was obtained. Patient specific dose was calculated for each data set by two methods. The first method was a summation …
Developing Auxiliary Resource Materials To Support The Engageny Geometry Curriculum, Joanne Griffin
Developing Auxiliary Resource Materials To Support The Engageny Geometry Curriculum, Joanne Griffin
LSU Master's Theses
With the advent of current education reform, and the introduction of the Common Core State Standards for Mathematics, the present offerings of the geometry curriculum have become dated. One contribution to remedy this situation is a project by the state of New York called EngageNY. EngageNY is a common core aligned mathematics curriculum across all grades. The EngageNY Geometry Curriculum Module 1 is the basis from which this thesis was developed. It is the purpose of this thesis to present a supplement to the EngageNY Geometry Module 1 Curriculum and to describe why it is advantageous to have such a …
Palynology Of The Upper Cretaceous Ferron-Notom Sandstone, Utah, Isil Akyuz
Palynology Of The Upper Cretaceous Ferron-Notom Sandstone, Utah, Isil Akyuz
LSU Master's Theses
ABSTRACT The Late Cretaceous Ferron-Notom Sandstone Member of the Mancos Shale Formation plays a dominant role in oil production in Utah. Although numerous sedimentological and sequence stratigraphic studies have been conducted in recent years on this sequence, palynological analyses had not yet been undertaken. Here we present palynological data from one hundred twenty eight samples collected in the Ferron-Noton Sandstone Member outcroping in south-central Utah. The purpose of this study is to refine our understanding of climatic and depositional environments and to build a biostratigraphic palynological framework. The dominance of terrestrial palynomorphs, especially the high yield in moisture-loving cryptogam spores …
Creating Effective Mymathlab Problems Aligned With 7th Grade Pre-Algebra Common Core State Standards, Erin Ashley Glover
Creating Effective Mymathlab Problems Aligned With 7th Grade Pre-Algebra Common Core State Standards, Erin Ashley Glover
LSU Master's Theses
As states across the nation began to transition to the Common Core State Standards (CCSS), new curriculums and supplemental resources were and are still being developed to guide and support the teachers and students. Pearson Education, the publisher of many mathematics textbooks, as well as the online program MyMathLab (MML), has been successfully providing meaningful, lasting mathematics learning materials for many years. Online learning programs, including MML, are used in thousands of middle school, high school, and college-level mathematics courses. However, these products were developed long before the adoption of the CCSS by 43 states, so they are not aligned …
Dissolved Oxygen Dynamics And Modeling - A Case Study In A Subtropical Shallow Lake, Zhen Xu
Dissolved Oxygen Dynamics And Modeling - A Case Study In A Subtropical Shallow Lake, Zhen Xu
LSU Master's Theses
As one of the most valued and treasured natural resources, today many lakes in the world face degradation of their water quality due to nutrient enrichment, toxic contamination, and hydrological modification from their drainage areas. Among various water quality impairments, dissolved oxygen (DO) depletion is often a leading stressor in lake systems. Despite numerous studies on DO in deep water lakes in temperate regions, the knowledge of DO dynamics in eutrophic shallow lakes in subtropical regions is still limited. This thesis research conducted intensive DO monitoring in an eutrophic shallow lake in south Louisiana to characterize diel cycles of DO …
Study Of The Low Energy Solar Neutrino Spectrometer (Lens) Concept With The Ulens Prototype, Liudmyla Afanasieva
Study Of The Low Energy Solar Neutrino Spectrometer (Lens) Concept With The Ulens Prototype, Liudmyla Afanasieva
LSU Master's Theses
Neutrinos are a useful tool that serves as an immediate probe of the Sun’s core providing insight into the details of the Sun’s energy production, internal composition and structure. Across the globe a number of solar neutrinos experiments have helped to clarify various characteristics of the solar neutrino spectrum. However, little experimental information is known regarding low-energy solar neutrinos, which comprise about 90% of the total solar neutrino spectrum. With this in mind, we are developing the Low Energy Solar Neutrino Spectrometer (LENS), an indium-based liquid scintillator detector with the capability to precisely measure the full spectrum of solar neutrinos, …
High School 4th Mathematics: Precalculus For Ap Calculus, Yong Suk Lowery
High School 4th Mathematics: Precalculus For Ap Calculus, Yong Suk Lowery
LSU Master's Theses
ABSTRACT The purpose of this thesis is to provide the needed instructional materials to those who are teaching a Precalculus course following Algebra I, Geometry, and Algebra II. The recent adoption of the Common Core State Standards in Mathematics (CCSSM) has left many teachers scrambling to find instructional materials that meet the graduation requirement as well as insuring that our students are college and career ready when they leave high school. Furthermore, the College Board’s Advanced Placement (AP) Calculus curriculum is generally accepted as the model for a twenty-first century calculus course serving as prerequisite for STEM related fields of …
Effect Of Predicting Motion On Student Understanding Of Kinematic Graphs, Charles William Redding
Effect Of Predicting Motion On Student Understanding Of Kinematic Graphs, Charles William Redding
LSU Master's Theses
Different interactive engagements strategies have given students more hands-on involvement in the classroom and helped increase conceptual learning in physics. The purpose of this study was to test the effect of predicting motion graphs by utilizing motion analysis software. Two groups of high school students followed a modified version of Sokoloff and Thornton’s seven step ILD process. One group was taught by making predictions. A second group was taught by watching demonstrations. To test for differences in the two groups understanding of kinematic graphs, pre and posttest where taken using the FMCE and Tug-K. The results of both the FMCE …
Hydraulic Fracturing: A Look At Efficiency In The Haynesville Shale And The Environmental Effects Of Fracking, Emily Celeste Jackson
Hydraulic Fracturing: A Look At Efficiency In The Haynesville Shale And The Environmental Effects Of Fracking, Emily Celeste Jackson
LSU Master's Theses
Hydraulic fracturing has become a hot topic in America’s growing, domestic, oil and natural industry. This new technology has provided an economic way to extract resources from tight oil and gas shale formations found deep underground, but this new way of drilling does not come without environmental and human health effects. Among these health effects are water usage, water quality, and air quality. In this paper, data from Frac Focus.org was used to get the average amount of water used per well, and the average amount of chemicals, and what those chemicals are, for each well in the Haynesville Shale. …
Polonium-210 Dynamics In The Northern Gulf Of Mexico, Patrick Robert Jones
Polonium-210 Dynamics In The Northern Gulf Of Mexico, Patrick Robert Jones
LSU Master's Theses
Polonium-210 (t1/2=138 d) is the most common among the 33 known radioisotopes of Polonium found in the natural environment. It is produced by the radioactive decay of its long-lived grandparent Lead-210(t1/2=22.3 d) via Bismuth-210 (t1/2=5.012 d) and forms as part of the natural Uranium-238 decay series. The primary hazard associated with Polonium-210 is its radioactivity, as an alpha particle emitter. Marine organisms receive their maximum radioactive dose in the natural environment from Polonium-210. Polonium has been known to bioaccumulate in the marine food web and can be potentially harmful to humans via the intake of certain marine organisms. Thus it …