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Developmental Math Education: The Bermuda Triangle Of Student Success--Many Enter, But Few Succeed., Julia Elizabeth Paxton Sullivan
Developmental Math Education: The Bermuda Triangle Of Student Success--Many Enter, But Few Succeed., Julia Elizabeth Paxton Sullivan
LSU Doctoral Dissertations
This study employed a quantitative design to evaluate the effectiveness of developmental math and the predictors of student success in developmental math for a period of three years. Four of the study’s original eight predictors of student success were statistically significant. However, a model was created using multinomial regression. The model was created using data from the fall 2013 semester and was tested using data from the fall 2014 semester. The effectiveness of developmental math in predicting a student’s success in the first college-level math course was tested using a multinomial regression. Although no statistical significance was found, the study …
Study Of Condensed Matter Systems With Monte Carlo Simulation On Heterogeneous Computing Systems, Sheng Feng
Study Of Condensed Matter Systems With Monte Carlo Simulation On Heterogeneous Computing Systems, Sheng Feng
LSU Doctoral Dissertations
We study the Edwards-Anderson model on a simple cubic lattice with a finite constant external field. We employ an indicator composed of a ratio of susceptibilities at finite momenta, which was recently proposed to avoid the difficulties of a zero momentum quantity, for capturing the spin glass phase transition. Unfortunately, this new indicator is fairly noisy, so a large pool of samples at low temperature and small external field are needed to generate results with a sufficiently small statistical error for analysis. We thus implement the Monte Carlo method using graphics processing units to drastically speed up the simulation. We …
Variability Of Optical Counterparts To X-Ray Sources Within The Galactic Bulge Survey, Christopher Bradley Johnson
Variability Of Optical Counterparts To X-Ray Sources Within The Galactic Bulge Survey, Christopher Bradley Johnson
LSU Doctoral Dissertations
The Chandra Galactic Bulge Survey (GBS) is a shallow, wide field survey to search for and classify X-ray sources in the Galactic Bulge. Specifically, we are looking for Low Mass X-ray Binaries (LMXBs): systems containing either a neutron star or black hole that is accreting matter from a roughly stellar mass companion via Roche-Lobe overflow. My research uses optical, time-series photometry from the DECam instrument on the Blanco 4.0 m telescope at the Cerro Tololo Inter-American Observatory to identify counterparts to new X-ray sources in the GBS. For the systems that are variable in brightness in the optical, I use …
Arsenic Speciation And Phytoremediation Modeling For Environmental Management, Sidney Joseph Marlborough
Arsenic Speciation And Phytoremediation Modeling For Environmental Management, Sidney Joseph Marlborough
LSU Doctoral Dissertations
Arsenic has been used throughout recorded history but during the industrial revolution widespread use led to global environmental impact. The two forms that should be considered in environment management are arsenate and arsenite. The calculations of environmental risk for arsenic exposure relies the toxicity of arsenite however, in well aeriated surface soils arsenate may be the predominate form. Ecological risk assessments based on arsenite studies will lead to restrictive remediation requirements that do not adequately reflect the level of risk. Arsenate resembles phosphate and as such has a greater affinity for phytoremediation. Phytoremediation is one of the most viable and …
Advances In Quantum Metrology: Continuous Variables In Phase Space, Bryan Tomas Gard
Advances In Quantum Metrology: Continuous Variables In Phase Space, Bryan Tomas Gard
LSU Doctoral Dissertations
This dissertation serves as a general introduction to Wigner functions, phase space, and quantum metrology but also strives to be useful as a how-to guide for those who wish to delve into the realm of using continuous variables, to describe quantum states of light and optical interferometry. We include many of the introductory elements one needs to appreciate the advantages of this treatment as well as show many examples in an effort to make this dissertation more friendly. In the initial segment of this dissertation, we focus on the advantages of Wigner functions and their use to describe many quantum …
Beyond The Tails Of The Colored Jones Polynomial, Jun Peng
Beyond The Tails Of The Colored Jones Polynomial, Jun Peng
LSU Doctoral Dissertations
In [2] Armond showed that the heads and tails of the colored Jones polynomial exist for adequate links. This was also shown independently by Garoufalidis and Le for alternating links in [8]. Here we study coefficients of the "difference quotient" of the colored Jones polynomial. We begin with the fundamentals of knot theory. A brief introduction to skein theory is also included to illustrate those necessary tools. In Chapter 3 we give an explicit expression for the first coefficient of the relative difference. In Chapter 4 we develop a formula of t_2, the number of regions with exactly 2 crossings …
Complexity Theory And Its Applications In Linear Quantum Optics, Jonathan Olson
Complexity Theory And Its Applications In Linear Quantum Optics, Jonathan Olson
LSU Doctoral Dissertations
This thesis is intended in part to summarize and also to contribute to the newest developments in passive linear optics that have resulted, directly or indirectly, from the somewhat shocking discovery in 2010 that the BosonSampling problem is likely hard for a classical computer to simulate. In doing so, I hope to provide a historic context for the original result, as well as an outlook on the future of technology derived from these newer developments. An emphasis is made in each section to provide a broader conceptual framework for understanding the consequences of each result in light of the others. …
Minimizing Decoherence In Optical Fiber For Long Distance Quantum Communication, Manish Kumar Gupta
Minimizing Decoherence In Optical Fiber For Long Distance Quantum Communication, Manish Kumar Gupta
LSU Doctoral Dissertations
In this research work, I have derived analytical models for decoherence of quantum states of light and developed techniques based on Dynamical Decoupling (DD) to preserve the quantum state of polarization qubit and Orbital Angular Momentum (OAM) qudit in single-mode, multi-mode and specialized optical fibers. In subsequent work, I have derived the analytical model for decoherence of an entangled state in an optical fiber to show that such a decoherence causes loss of entanglement. I also showed that such states can be preserved with DD. In Chapter 1, I have introduced the subject of a quantum computer and its relation …
Twisted Reflection Positivity, Mostafa Ahmad Hayajneh
Twisted Reflection Positivity, Mostafa Ahmad Hayajneh
LSU Doctoral Dissertations
Reflection positivity has several applications in both mathematics and physics. For example, reflection positivity induces a duality between group representations. In this thesis, we coin a new definition for a new kind of reflection positivity, namely, twisted reflection positive representation on a vector space. We show that all of the non-compactly causal symmetric spaces give rise to twisted reflection positive representations. We discover examples of twisted reflection positive representations on the sphere and on the Grassmannian manifold which are not unitary, namely, the generalized principle series with the Cosine transform as an intertwining operator. We give a direct proof for …
Probabilistic And Deep Learning Algorithms For The Analysis Of Imagery Data, Saikat Basu
Probabilistic And Deep Learning Algorithms For The Analysis Of Imagery Data, Saikat Basu
LSU Doctoral Dissertations
Accurate object classification is a challenging problem for various low to high resolution imagery data. This applies to both natural as well as synthetic image datasets. However, each object recognition dataset poses its own distinct set of domain-specific problems. In order to address these issues, we need to devise intelligent learning algorithms which require a deep understanding and careful analysis of the feature space. In this thesis, we introduce three new learning frameworks for the analysis of both airborne images (NAIP dataset) and handwritten digit datasets without and with noise (MNIST and n-MNIST respectively). First, we propose a probabilistic framework …
Visible Light And Electron Transfer Chemistry For O-Glycosylation And Remote Hydroxylation, Mark Louis Spell
Visible Light And Electron Transfer Chemistry For O-Glycosylation And Remote Hydroxylation, Mark Louis Spell
LSU Doctoral Dissertations
This dissertation focuses on the synthesis of dauer pheromone analogs for biological evaluation, the development of visible light promoted O-glycosylation methods and the development of an Ir(ppy)3 catalyzed C-H hydroxylation method. Chapter 1 describes the synthesis of dauer pheromone analogs. C.elegans is a small nematode that enters a dauer stage when encountering unfavorable environmental conditions. The dauer stage is initiated by the nematodes chemosensation of the dauer pheromone caused by the down regulation biochemical pathways TGF-â and IGF-1. These biochemical pathways are also seen in Homo Sapiens and play a role in a number of biological processes. Understanding how these …
Synthesis Of Functional Polypeptides And Development Of New Synthetic Strategies Toward Polypeptides, Jinbao Cao
Synthesis Of Functional Polypeptides And Development Of New Synthetic Strategies Toward Polypeptides, Jinbao Cao
LSU Doctoral Dissertations
The objective of this work is to develop a new synthetic strategy for synthesizing advanced functional polypeptides or polypeptides in general. Polypeptides are amino acids based polymers with appealing properties for different applications. One of the key challenges in polypeptide research is the synthesis of functional polypeptides under mild conditions. We developed a system based on ring-opening polymerization (ROP) of N-thiocarboxyanhydrosulfides (NTAs) to synthesize polypeptides with wide range of molecular weights under mild conditions. Owing to NTAs’ good stability, our system serves as an excellent alternative to the traditional ROP of N-carboxyanhydrides (NCA). In Chapter 1, the fundamental knowledge and …
A Direct Study Of 20ne(Alpha,P)23na With The Helical Orbit Spectrometer (Helios), Jianping Lai
A Direct Study Of 20ne(Alpha,P)23na With The Helical Orbit Spectrometer (Helios), Jianping Lai
LSU Doctoral Dissertations
Type Ia Supernovae are thermonuclear explosions that occur on CO white dwarfs in binary systems, completely disrupting the system. While the exact progenitor of these events is unclear, there have been several studies exploring the nucleosynthesis that drives these stellar explosions. These studies have shown that a handful of reactions have a significant effect on Type Ia Supernova nucleosynthesis, specifically 12C(alpha, gamma), 12C+12C, 20Ne(alpha, p), 20Ne(alpha, gamma), and 30Si(p, gamma). While the 20Ne(alpha,p)23Na reaction has been shown to be one of the five most influential reactions, it has not been directly been measured at astrophysically relevant energies. We performed direct …
Modelling Hydraulic Fracturing Propagation In Heterogeneous Reservoirs Using Cohesive Zone Methods, Miguel Alejandro Gonzalez-Chavez
Modelling Hydraulic Fracturing Propagation In Heterogeneous Reservoirs Using Cohesive Zone Methods, Miguel Alejandro Gonzalez-Chavez
LSU Doctoral Dissertations
The recent success in exploiting low permeability shale reservoirs has heavily relied on hydraulic fracturing to produce hydrocarbons economically in disadvantaged reservoir conditions. Although horizontal drilling significantly increases the contact area between the wellbore and the reservoir, the objective of hydraulic fracturing is set on creating further expanded conductive flow paths into the reservoir. This research uses cohesive zone method to numerically simulate hydraulic fracture propagation in the presence of natural fractures in two- and three-dimensional model. The Cohesive element approach limits fracture propagation to some predefined paths. However, in highly fractured formations since hydraulic fractures are growing through a …
Dynamic Resonant Scattering Of Near-Monochromatic Fields, Gayan Shanaka Abeynanda
Dynamic Resonant Scattering Of Near-Monochromatic Fields, Gayan Shanaka Abeynanda
LSU Doctoral Dissertations
Certain universal features of photonic resonant scattering systems are encapsulated in a simple model which is a resonant modification of the famous Lamb Model for free vibrations of a nucleus in an extended medium. We analyze this "resonant Lamb model" to garner information on dynamic resonant scattering of near-monochromatic fields when an extended system is weakly coupled to a resonator. The transmitted field in a resonant scattering process consists of two distinct pathways: an initial pulse (direct transmission) and a tail of slow decay (resonant transmission). The resonant Lamb model incorporates a two-part scatterer attached to an infinite string with …
Synthetic Efforts Towards The Synthesis Of Prostaglandin Pgf2a, Amy Marie Pollard
Synthetic Efforts Towards The Synthesis Of Prostaglandin Pgf2a, Amy Marie Pollard
LSU Doctoral Dissertations
This dissertation describes strategies for synthesizing prostaglandin PGF2α. Our synthetic design creates the stereochemistry needed for the core and side chains of the target prostaglandin PGF2 alpha and PGF2 alpha synthase selective analogues while incorporating iodocyclization desymmetrization of acyclic dienes. A model system for 4-(iodomethyl)-6-methyl-1,3-dioxan-2-one was developed and synthesized for our target compound 4-(2-(benzyloxy)ethyl)-6-(iodomethyl)-5-vinyl-1,3-dioxan-2-one. Both compounds were successfully synthesized providing useful stereocenters for completing the synthesis of prostaglandin PGF2 alpha. Efforts toward total stereochemical control of PGF2α include the partial syntheses of bis-diethylanimedimethylsilane and of (4S,5S)-2-((1E,3E)-penta-1,3-dien-1-yl)-4,5-diphenyl-1,3-ditosyl-1,3,2-diazaborolidine.
Understanding Agile Software Development Assimilation Beyond Acceptance, Corey Wayne Baham
Understanding Agile Software Development Assimilation Beyond Acceptance, Corey Wayne Baham
LSU Doctoral Dissertations
Agile software development methods represent a departure from the heavily regimented and document-driven procedures of traditional, waterfall approaches. Despite the highly touted benefits of employing agile ISD methods and the growth of agile adoption rates over the past two decades, it is not clear why some organizations fail to routinize agile methods, while others do so and realize their promised benefits. Motivated by the need to understand the factors that influence agile routinization, this study empirically examines the deep contextual factors that impact the extent to which agile methods are proliferated throughout an organization. Findings indicate that project success from …
Toward An Advanced System Of Accountability For Improved Student Learning Outcomes: A Mixed-Methods Analysis Of Test-Based Accountability In Louisiana, Susan Nicole Kahn
Toward An Advanced System Of Accountability For Improved Student Learning Outcomes: A Mixed-Methods Analysis Of Test-Based Accountability In Louisiana, Susan Nicole Kahn
LSU Doctoral Dissertations
The nature of federal and state policies regarding accountability testing narrows the taught curriculum to content tested, thereby changing what is officially valued as student learning. The over-emphasis on standardized test scores has narrowed the curriculum to content that is tested (Amrein & Berliner, 2002; Baker, 2008; Herman, 2008; Koretz & Hamilton, 2003; Linn, 2000). In Louisiana, test-based accountability defines local school quality through a letter grade rating scale that uses an index for school performance scores (SPS), which in turn impacts traditional and nontraditional (e.g. charter) school expansion, closure, and takeover, administration of opportunity scholarships (e.g. voucher) for private …
Essays On The Externalities Of The Mahatma Gandhi National Rural Employment Guarantee Act Of India, Satadru Das
Essays On The Externalities Of The Mahatma Gandhi National Rural Employment Guarantee Act Of India, Satadru Das
LSU Doctoral Dissertations
In this dissertation, I offer two distinct studies on the welfare externalities of the Mahatma Gandhi National Rural Employment Guarantee Act (MGNREGA) of India. The MGNREGA is an employment guarantee scheme implemented in rural India since 2006 and is the world’s largest public works project. In the first study, I look at the effects of the MGNREGA on crime in India. I use crime statistics from National Crime Records Bureau of India to create a district level panel between 2002 and 2012 to estimate the effects of the program on various violent and property crimes. I also create a district …
Analysis And Management Of The Price Volatility In The Construction Industry, Alireza Joukar
Analysis And Management Of The Price Volatility In The Construction Industry, Alireza Joukar
LSU Doctoral Dissertations
The problem of price volatility as it pertains to material and labor is a major source of risk and financial distress for all the participants in the construction industry. The overarching goal of this dissertation is to address this problem from both viewpoints of risk analysis and risk management. This dissertation offers three independent papers addressing this goal. In the first paper using the Engineering News Record Construction Cost Index (ENR CCI), a predictive model is developed. The model uses General Autoregressive Conditional Heteroscedastic (GARCH) approach which facilitates both forecasting of the future values of the CCI, and capturing and …
Cluster Algebras And Maximal Green Sequences For Closed Surfaces, Eric Bucher
Cluster Algebras And Maximal Green Sequences For Closed Surfaces, Eric Bucher
LSU Doctoral Dissertations
Given a marked surface (S,M) we can add arcs to the surface to create a triangulation, T, of that surface. For each triangulation, T, we can associate a cluster algebra. In this paper we will consider orientable surfaces of genus n with two interior marked points and no boundary component. We will construct a specific triangulation of this surface which yields a quiver. Then in the sense of work by Keller we will produce a maximal green sequence for this quiver. Since all finite mutation type cluster algebras can be associated to a surface, with some rare exceptions, this work …
Feedback Control Theory In Stochastic Dynamical Systems, Ashkan Balouchi
Feedback Control Theory In Stochastic Dynamical Systems, Ashkan Balouchi
LSU Doctoral Dissertations
A stochastic dynamical system is a system composed of many interacting components which includes stochastic behavior. Feedback control theory is designed to use information from the current state of the system in order to temper the final state toward the desired outcome. In this dissertation, I perform studies on two choices of classic and quantum dynamical systems to cover vast variety of statistical tools and methods. For classical model, I perform a study on finite-size effects at the phase transition in the Nagel-Schreckenberg traffic model as an example of non-equilibrium many body stochastic dynamical system. For quantum mechanical model, I …
Microscopic Study Of Structure, Chemical Composition And Local Conductivity Of La2/3sr1/3mno3 Films, Lina Chen
Microscopic Study Of Structure, Chemical Composition And Local Conductivity Of La2/3sr1/3mno3 Films, Lina Chen
LSU Doctoral Dissertations
The colossal magnetoresistance (CMR) manganites have attracted intensive study due to their richness of underlying physics and potential technological applications. Of particular interest is half-metallic La2/3Sr1/3MnO3 (LSMO) because it possesses the highest known Curie temperature of the group ~ 370 K), which makes it a promising candidate for room temperature spintronic applications. On the other hand, LSMO ultrathin films exhibit a metal-insulator transition (MIT) when reducing film thickness. The origin of such a thickness-dependent MIT remains highly controversial, though understanding and controlling this kind of behavior is necessary for any possible device applications. An essential first step then, and the …
Investigating The Structure Of The Papain-Inhibitor Complex Using Spr And Nmr, Margaret Sara Thomasson
Investigating The Structure Of The Papain-Inhibitor Complex Using Spr And Nmr, Margaret Sara Thomasson
LSU Doctoral Dissertations
Cysteine proteases (CPs) are enzymes with a nucleophilic thiol in their active sites. Inhibitors of cysteine proteases (ICPs) occur naturally in bacterial pathogens and some protozoa. In parasites, ICPs are often virulence factors, contributing to the formation and survival of amastigotes within host cells. These amastigotes have higher CP activity, therefore making both ICPs and CPs potential drug targets. Despite great genetic variability, ICPs contain highly conserved structural features, including a series of defined loops that play a significant role in binding CPs. Papain, a CP from Carica papaya, complexes with ICP from Leishmania mexicana. Although the individual 3-D structures …
Ultrafast And Nonlinear Spectroscopy Of Colloidal Nanomaterials, Tony Eugene Karam
Ultrafast And Nonlinear Spectroscopy Of Colloidal Nanomaterials, Tony Eugene Karam
LSU Doctoral Dissertations
In the first part of this dissertation, the adsorption isotherms, resonance coupling, and fluorescence of molecular dyes on the surface of plasmonic nanoparticles are investigates. SHG is also used to investigate the growth of a silver shell on the surface of gold nanoparticles in real time. Additionally, gold-silver-gold core-shell-shell nanoparticles possess extinction peak wavelengths that can be controlled over the visible and near-infrared regions and enhanced photothermal effect. Transient absorption measurements determine that the phonon-phonon scattering lifetime is considerably faster in the core-shell-shell nanoparticles than in the gold nanospheres and gold nanorods, which contributes to the higher photothermal efficiencies. Transient …
Relay Selection Strategies For Multi-Hop Cooperative Networks, Hui Sun
Relay Selection Strategies For Multi-Hop Cooperative Networks, Hui Sun
LSU Doctoral Dissertations
In this dissertation we consider several relay selection strategies for multi-hop cooperative networks. The relay selection strategies we propose do not require a central controller (CC). Instead, the relay selection is on a hop-by-hop basis. As such, these strategies can be implemented in a distributed manner. Therefore, increasing the number of hops in the network would not increase the complexity or time consumed for the relay selection procedure of each hop. We first investigate the performance of a hop-by-hop relay selection strategy for multi-hop decode-and-forward (DF) cooperative networks. In each relay cluster, relays that successfully receive and decode the message …
Application Of The Variational Fracture Model To Hydraulic Fracturing In Poroelastic Media, Chukwudi Chukwudozie
Application Of The Variational Fracture Model To Hydraulic Fracturing In Poroelastic Media, Chukwudi Chukwudozie
LSU Doctoral Dissertations
Hydraulic fracturing has persisted through the use of simple numerical models to describe fracture geometry and propagation. Field tests provide evidence of interaction and merging of multiple fractures, complex fracture geometry and propagation paths. These complicated behaviors suggest that the simple models are incapable of serving as predictive tools for treatment designs. In addition, other commonly used models are designed without considering poroelastic effects even though a propagating hydraulic fracture induces deformation of the surrounding porous media. A rigorous hydraulic fracturing model capable of reproducing realistic fracture behaviors should couple rock deformation, fracture propagation and fluid flow in the both …
Global A Priori Estimates And Sharp Existence Results For Quasilinear Equations On Nonsmooth Domains., Karthik Adimurthi
Global A Priori Estimates And Sharp Existence Results For Quasilinear Equations On Nonsmooth Domains., Karthik Adimurthi
LSU Doctoral Dissertations
This thesis deals obtaining global a priori estimates for quasilinear elliptic equations and sharp existence results for Quasilinear equations with gradient nonlinearity on the right. The main results are contained in Chapters 3, 4, 5 and 6. In Chapters 3 and 4, we obtain global unweighted a priori estimates for very weak solutions below the natural exponent and weighted estimates at the natural exponent. The weights we consider are the well studied Muckenhoupt weights. Using the results obtained in Chapter 4, we obtain sharp existence result for quasilinear operators with gradient type nonlinearity on the right. We characterize the function …
Retention Of Institutional Memory Via Knowledge Management: Perceptions Regarding The Effectiveness Of Corporate Approaches Applied In Higher Education, Sonya Yvette Marsh
Retention Of Institutional Memory Via Knowledge Management: Perceptions Regarding The Effectiveness Of Corporate Approaches Applied In Higher Education, Sonya Yvette Marsh
LSU Doctoral Dissertations
Research has shown that private industry has a better grasp on knowledge management concepts and practices than in the higher education arena. Given the internal and external challenges facing colleges and universities, the processes and systems associated with knowledge management could serve as a resource for performance improvement and greater levels of effectiveness and efficiency. This phenomenological study was conducted to determine the perceptions and perspectives of deans regarding the usefulness and value of implementing knowledge management best practices typically employed by organizations in the private sector. Four research questions guided this study: 1) What level of awareness exists of …
Theory And Utility Of The Three Isotope Fractionation Relationship, Justin Alan Hayles
Theory And Utility Of The Three Isotope Fractionation Relationship, Justin Alan Hayles
LSU Doctoral Dissertations
The field of isotope geochemistry began with the study of oxygen isotope geothermometry, most famously for carbonates. Traditionally oxygen isotope studies are only concerned with the relationship between one rare isotope, oxygen-18, and the common isotope, oxygen-16. In these cases, the abundance of the third stable isotope, oxygen-17 is ignored because for almost all terrestrial processes the 17O-16O relationship roughly scales with the 18O-16O relationship through a fractionation processes and is thought to not provide any new information. However, the discovery of large “mass independent” isotope effects for ozone chemistry has driven a multitude of uses for triple isotope relationships. …