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Articles 1291 - 1320 of 2330
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Investigations Of The Initiation Of Motion In Aeolian Transport, Brandon L. Edwards
Investigations Of The Initiation Of Motion In Aeolian Transport, Brandon L. Edwards
LSU Doctoral Dissertations
This dissertation is an investigation of the initiation of motion in aeolian sediment transport. The chapters within address transport thresholds for dry sands and spatiotemporal variability of surface moisture on natural beaches, both critical concerns for the study of aeolian processes. Results indicate a new model of transport threshold conditions provides substantial improvement in predictive capability. Field measurements closely match model predictions. In addition, results indicate that small scale variability and near surface gradients of surficial moisture are important components to aeolian systems. New techniques for measuring beach surface moisture provide improved accuracy over previous approaches.
Experimental And Computational Studies Of Environmentally Persistent Free Radicals (Epfrs) Formation, Lucy W. Kiruri
Experimental And Computational Studies Of Environmentally Persistent Free Radicals (Epfrs) Formation, Lucy W. Kiruri
LSU Doctoral Dissertations
The first part of the thesis investigates the use of theoretical quantum calculations for the study of EPFRs as the initial and fundamental step in the formation of polychlorinated dibenzo-p-dioxin and dibenzofuran. The computational model comprised of density functionals (B3LYP, PBE1PBE, and M06) and two types of basis set namely: LANL2DZ for all atoms and GEN (LANL2DZ for metals and aug-cc-pVDZ for non-metals). Full mechanisms of EPFRs formation over (CuO)1-8, and aluminum oxide clusters were studied. The most stable intermediates and products have been determined and compared to available experimental data. In case of (CuO)1-8 clusters, the small clusters are …
Feedback Control Of Sector-Bound Nonlinear Systems With Applications To Aeroengine Control, Luis Donaldo Alvergue
Feedback Control Of Sector-Bound Nonlinear Systems With Applications To Aeroengine Control, Luis Donaldo Alvergue
LSU Doctoral Dissertations
This dissertation is divided into two parts. In the first part we consider the problem of feedback stabilization of nonlinear systems described by state-space models. This approach is inherited from the methodology of sector bounded or passive nonlinearities, and influenced by the concept of absolute and quadratic stability. It aims not only to regionally stabilize the nonlinear dynamics asymptotically but also to maximize the estimated region of quadratic attraction and to ensure nominal performance at each equilibrium. In close connection to gain scheduling and switching control, a path of equilibria is programmed based on the assumption of centered-epsilon-cover which leads …
From Engagement To Alignment : Exploring Enterprise Architecture Through The Lens Of Design Science, Matthew Lloyd Levy
From Engagement To Alignment : Exploring Enterprise Architecture Through The Lens Of Design Science, Matthew Lloyd Levy
LSU Doctoral Dissertations
Information Systems Design Science (ISDS) as a research community is limited by a small number of research frameworks with considerable influence. The small triad of influential ISDS research, consisting of Walls, et al (1992), March and Smith (1995), and Hevner et al (2004) have primarily limited ISDS research to the positivist paradigm and the IT artifact. In contrast, Herbert Simon’s intentions for design science never had such restrictions and intended a broader perspective. This dissertation explores Simon’s intentions for design science, the Simonian stream of thought that includes The Sciences of the Artificial, as well as much of his most …
Exploring The Underpinnings That Attribute To Low Performance On Standardized Tests By First Year University Freshmen At A Historically Black College And University, Jeffery Joseph Darby, Jr.
Exploring The Underpinnings That Attribute To Low Performance On Standardized Tests By First Year University Freshmen At A Historically Black College And University, Jeffery Joseph Darby, Jr.
LSU Doctoral Dissertations
The primary purpose of this study was to examine and determine what factors contribute to the prevention of first semester freshmen students not succeeding on high stakes tests based on their opinions, and what variables are important to their performance at the university. The Personal Educational Academic Survey (PEAS), a 65 item Likert-type scale was designed to measure the students’ opinions regarding their academic knowledge acquired during their first semester in college in Academic Achievement and other courses at Langston University. The final response count was 216 representing a 35.47% response rate. The target population in this research study was …
Phase Behavior Of Silica-Polypeptide Hybrid Particles Immersed In Cholesteric Liquid Crystals, Melissa Elizabeth Collins
Phase Behavior Of Silica-Polypeptide Hybrid Particles Immersed In Cholesteric Liquid Crystals, Melissa Elizabeth Collins
LSU Doctoral Dissertations
Silica-polypeptide hybrid particles are core-shell colloids. Established synthetic methods ensure uniformly sized cores and provide the ability to have magnetic or fluorescent inclusions. The polypeptide shell is highly functional in its ability to respond to stimuli through changes in shape and formation of ordered phases above certain concentrations or temperatures. This research explores the interactions of hybrid particles mixed with polypeptides dispersed in solution. Depletion theory, which considers mainly entropic interactions between particles, can be used to explain the phase behavior of colloids. Due to the chemical similarities between the polypeptides attached to the surface and those free in solution, …
Searching For New Gamma-Ray Sources Using Earth Occultation Imaging With The Cgro/Burst And Transient Source Experiment, Yuan Zhang
LSU Doctoral Dissertations
Earth occultation provides a means of monitoring gamma-ray sources over the entire sky. This technique has been demonstrated with the Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory (CGRO) active from 1991 to 2000, and is now being used with the Gamma-ray Burst Monitor (GBM) instrument on the Fermi mission. Although this approach provides a powerful wide field monitoring capability, the BATSE and GBM implementations of this technique have so far limited the analysis to a catalog of previously identified sources. In this dissertation, an indirect imaging method is described that permits searching for unknown sources …
Effects Of Stress And Water Saturation On Seismic Velocity And Attenuation In Near Surface Sediments, James Michael Crane
Effects Of Stress And Water Saturation On Seismic Velocity And Attenuation In Near Surface Sediments, James Michael Crane
LSU Doctoral Dissertations
Seismic investigation in the near-surface is complicated by highly attenuating media, large interparticle stresses, and variable water saturation, so new tools and methodology are necessary to understand the relationships between velocity, attenuation, and physical properties of the propagating media. A new shear wave source is developed for investigation of gas-charged, organic-rich sediments because compressional waves are highly attenuated and currently available sources are inadequate. The new source compares favorably to a traditional hammer impact source, producing a signal with a broader-band of frequencies (30-100Hz cf. 30-60Hz) and signal-to-noise ratios (SNR) equivalent to ~3 stacked hammer blows to the hammer impact …
Multiplicity Formulas For Perverse Coherent Sheaves On The Nilpotent Cone, Myron Minn-Thu-Aye
Multiplicity Formulas For Perverse Coherent Sheaves On The Nilpotent Cone, Myron Minn-Thu-Aye
LSU Doctoral Dissertations
Arinkin and Bezrukavnikov have given the construction of the category of equivariant perverse coherent sheaves on the nilpotent cone of a complex reductive algebraic group. Bezrukavnikov has shown that this category is in fact weakly quasi-hereditary with Andersen--Jantzen sheaves playing a role analogous to that of Verma modules in category O for a semi-simple Lie algebra. Our goal is to show that the category of perverse coherent sheaves possesses the added structure of a properly stratified category, and to use this structure to give an effective algorithm to compute multiplicities of simple objects in perverse coherent sheaves. The algorithm is …
The Development Of Capillary Electrophoresis Assays To Study Enzyme Inhibition, Sherrisse Kelly Bryant
The Development Of Capillary Electrophoresis Assays To Study Enzyme Inhibition, Sherrisse Kelly Bryant
LSU Doctoral Dissertations
New methods for studying enzymes and enzyme inhibition using capillary electrophoresis (CE) were developed and applied. Because CE is a separation technique, spectral interference is minimized by separation of substrates, products, inhibitors, and sample matrix components. Two types of CE enzyme assays were explored in this dissertation research. The first assay was based on optically gated vacancy capillary electrophoresis (OGVCE) with laser-induced fluorescence detection (LIF). This approach involves periodic photobleaching of fluorescent substrates and products. The initial goal of the study was to develop an assay for adenosine deaminase (ADA). A fluorescent ADA substrate was synthesized; however, the substrate was …
Finite Element Modeling Of Hot-Mix Asphalt Performance In The Laboratory, Hao Ying
Finite Element Modeling Of Hot-Mix Asphalt Performance In The Laboratory, Hao Ying
LSU Doctoral Dissertations
The theoretical investigation of Hot-Mix Asphalt (HMA) response in the dynamic modulus and the semi-circular bending (SCB) laboratory test procedures is necessary to understand the influence of various design parameters on the performance of the mix. In addition, laboratory tests such as the dynamic complex modulus assume that this material can be dealt with as a homogeneous material while overlooking the particulate nature of this composite. The ultimate goal of this study is to develop an advanced theoretical framework, based on three-dimensional (3D) finite element (FE) methods and digital image analysis techniques to describe the behavior of HMA in two …
Program Analysis : Termination Proofs For Linear Simple Loops, Hongyi Chen
Program Analysis : Termination Proofs For Linear Simple Loops, Hongyi Chen
LSU Doctoral Dissertations
Termination proof synthesis for simple loops, i.e., loops with only conjoined constraints in the loop guard and variable updates in the loop body, is the building block of termination analysis, as well as liveness analysis, for large complex imperative systems. In particular, we consider a subclass of simple loops which contain only linear constraints in the loop guard and linear updates in the loop body. We call them Linear Simple Loops (LSLs). LSLs are particularly interesting because most loops in practice are indeed linear; more importantly, since we allow the update statements to handle nondeterminism, LSLs are expressive enough to …
Gene Set Based Ensemble Methods For Cancer Classification, William Evans Duncan
Gene Set Based Ensemble Methods For Cancer Classification, William Evans Duncan
LSU Doctoral Dissertations
Diagnosis of cancer very often depends on conclusions drawn after both clinical and microscopic examinations of tissues to study the manifestation of the disease in order to place tumors in known categories. One factor which determines the categorization of cancer is the tissue from which the tumor originates. Information gathered from clinical exams may be partial or not completely predictive of a specific category of cancer. Further complicating the problem of categorizing various tumors is that the histological classification of the cancer tissue and description of its course of development may be atypical. Gene expression data gleaned from micro-array analysis …
Achievable Secrecy Enchancement Through Joint Encryption And Privacy Amplification, Yahya Sowti Khiabani
Achievable Secrecy Enchancement Through Joint Encryption And Privacy Amplification, Yahya Sowti Khiabani
LSU Doctoral Dissertations
In this dissertation we try to achieve secrecy enhancement in communications by resorting to both cryptographic and information theoretic secrecy tools and metrics. Our objective is to unify tools and measures from cryptography community with techniques and metrics from information theory community that are utilized to provide privacy and confidentiality in communication systems. For this purpose we adopt encryption techniques accompanied with privacy amplification tools in order to achieve secrecy goals that are determined based on information theoretic and cryptographic metrics. Every secrecy scheme relies on a certain advantage for legitimate users over adversaries viewed as an asymmetry in the …
An Insider's View : An Exploration Of Implementing The Common Core Standards For Mathematical Practice For Elementary Teachers In A Rural Louisiana Charter School, Teri P. Roberts
LSU Doctoral Dissertations
This qualitative single case study in a rural start-up charter school in North Louisiana explored the impact that professional learning from Whole-Faculty Study Group sessions had on teachers’ understanding of the most significant contributions of the Standards for Mathematical Practice in preparation of the implementation of the Common Core State Standards for Mathematics (CCSSM). The theoretical framework proposed that structured time for collaboration would enhance teachers’ understanding of the math practice standards. The literature indicated that collaborative job-embedded professional learning can lead to improvements in teachers’ knowledge and practice and that understanding the Standards for Mathematical Practice is key to …
Challenges And Rewards Of Single Crystal Flux Growth: Physical Properties Of Structurally Related Ln-Ru-Al Intermetallics, Gregory Morrison
Challenges And Rewards Of Single Crystal Flux Growth: Physical Properties Of Structurally Related Ln-Ru-Al Intermetallics, Gregory Morrison
LSU Doctoral Dissertations
The availability of single crystals is vital for understanding the intrinsic properties of crystalline materials. The flux growth method is a versatile technique which may be used to grow single crystals. However, their synthesis can often be challenging, especially when a competing phase is very robust. Herein, we study the growth competition between structurally related compounds in the Ln-Ru-Al phase space. We demonstrate the benefits of single crystals and suggest methods to grow competing phases. CeRu2Al10 has garnered interest due to its higher ordering temperate than expected from de Gennes scaling and its metal-to-insulator transition at the same temperature. Here, …
Refining The Characterization Of Projective Graphs, Perry K. Iverson
Refining The Characterization Of Projective Graphs, Perry K. Iverson
LSU Doctoral Dissertations
Archdeacon showed that the class of graphs embeddable in the projective plane is characterized by a set of 35 excluded minors. Robertson, Seymour and Thomas in an unpublished result found the excluded minors for the class of k-connected graphs embeddable on the projective plane for k = 1,2,3. We give a short proof of that result and then determine the excluded minors for the class of internally 4-connected projective graphs. Hall showed that a 3-connected graph diff_x000B_erent from K5 is planar if and only if it has K3,3 as a minor. We provide two analogous results for projective graphs. For …
Background, Analysis, And Performance Guide For Edison Denisov's Sonata For Flute And Piano, Esther June Waite
Background, Analysis, And Performance Guide For Edison Denisov's Sonata For Flute And Piano, Esther June Waite
LSU Doctoral Dissertations
After composer Edison Vasilievich Denisov (1929–1996) finished his graduate work at the Moscow Conservatoire, he launched into an independent examination of composers whose music had been banned by the Soviet authorities during his conservatory years (1951–1959). It was during this time in his compositional development that he composed his Sonata for Flute and Piano (1960). The first section of this document provides a biographical summary of Edison Denisov and the circumstances surrounding the composition of the flute sonata. The second section is devoted to formal, harmonic, and stylistic analysis of the sonata. The final section of the document provides a …
Time-Variant Performance Assessment And Improvement Of Existing Bridges, Miao Xia
Time-Variant Performance Assessment And Improvement Of Existing Bridges, Miao Xia
LSU Doctoral Dissertations
The serviceability and safety of buildings and bridges are expected to be maintained within a reasonable safety level throughout their lifetimes. However, the increase of the applied loads and degradation of structural performances reduce the safety of these structures over time. Therefore, the performance assessment of existing bridges with reliability theories is a worldwide problem in civil infrastructure systems. Theoretically, the bridge reliability, usually expressed by a reliability index, is quantified by comparing the structural capacity (R) with the load effects (Q), using the predefined limit state functions. A limit state function is a mathematical description of a boundary between …
On Contests With Complementarities, Matthew Wiser
On Contests With Complementarities, Matthew Wiser
LSU Doctoral Dissertations
In this dissertation, we consider the role of complementarities in contests. In most contests, there is either a single prize available, or multiple prizes whose joint value is simply the sum of the values of the individual prizes. We consider contests involving competitions for multiple objectives whose value depend on the combination of objectives won. These combinations of objectives are the basis for the complementarities we examine. We use contests consisting of multiple subcontests, with the subcontests determining the winner of each objective. The overall contest thus determines which combinations of objectives each player achieves, and thus the overall prize …
Skein Theory And Topological Quantum Field Theory, Xuanting Cai
Skein Theory And Topological Quantum Field Theory, Xuanting Cai
LSU Doctoral Dissertations
Skein modules arise naturally when mathematicians try to generalize the Jones polynomial of knots. In the first part of this work, we study properties of skein modules. The Temperley-Lieb algebra and some of its generalizations are skein modules. We construct a bases for these skein modules. With this basis, we are able to compute some gram determinants of bilinear forms on these skein modules. Also we use this basis to prove that the Mahler measures of colored Jones polynomial of a sequence of knots converges to the Mahler measure of some two variable polynomial. The topological quantum field theory constructed …
Analysis Of Protein Aggregates And Synthetic Nanoparticles Using Capillary Electrophoresis With Light Scattering And Fluorescence Detection, Suresh Chandra Regmi
Analysis Of Protein Aggregates And Synthetic Nanoparticles Using Capillary Electrophoresis With Light Scattering And Fluorescence Detection, Suresh Chandra Regmi
LSU Doctoral Dissertations
The goal of the research presented in this dissertation is to develop capillary electrophoresis (CE) based analysis techniques for the characterization of individual particles including amyloid beta (Aâ) peptide aggregates and to apply these methods to study the aggregation of Aâ peptides. Protein self-assembly into ordered aggregates is a common and important process in normal biological function, but this process is also involved in several diseases. Amyloid beta peptide aggregation is linked to Alzheimer’s disease. Thioflavin T (ThT) has been used as a fluorescent probe for the detection of Aâ aggregation. Based on previous observations of false positive fluorescent signals …
Modeling Temporal And Spatial Variations In Dissolved Oxygen In Amite River, Vahid Zahraeifard
Modeling Temporal And Spatial Variations In Dissolved Oxygen In Amite River, Vahid Zahraeifard
LSU Doctoral Dissertations
A watershed-based modeling framework is developed in this dissertation for simulating temporal and spatial variations in DO in lowland rivers with organic-rich fine-grained sediment. The modeling framework is based on three major contributions/new models, including (1)VART-DO model for improved estimation of reaeration coefficient (K2) in natural streams, (2)VART-DOS model for simulation of temporal variations in DO in response to sediment resuspension, and (3)VART DO-3L model for simulation of spatial variations in DO. A major advantage of VART-DO model is the capability of simulating DO exchange across the water-sediment interface through the hyporheic exchange mechanism in addition to the air-water exchange. …
Crystal Growth And An Investigation Of Structural Stability: Synthesis, Structure, And Physical Properties Of Yb(Mn,M)Xal12-X (M = Fe, Ru; X < 2.5) And Lnmnxga3 (Ln = Ho-Tm; X < 0.15), Bradford Wesley Fulfer
Crystal Growth And An Investigation Of Structural Stability: Synthesis, Structure, And Physical Properties Of Yb(Mn,M)Xal12-X (M = Fe, Ru; X < 2.5) And Lnmnxga3 (Ln = Ho-Tm; X < 0.15), Bradford Wesley Fulfer
LSU Doctoral Dissertations
The contents of this dissertation describe the crystal growth, crystal structures, and physical properties of ternary intermetallic aluminides and gallides. These compounds are grown in an effort to determine how controlling reaction ratios using the flux growth method can impact chemical structure and physical properties. Three specific examples are given where slight changes in reaction ratios leads to crystalline products that adopt various structure types. LnMn2+xAl10-x (Ln = Gd, Yb) crystals adopt the CaCr2Al10 and ThMn12 structure types. We compare LnMn2+xAl10-x compounds adopting the CaCr2Al10 and ThMn12 structure types, and outline synthesis methods to obtain each polymorph. Magnetic susceptibility measurements …
Optimizing Light Requirements And Dilution Rates For Maximizing Algal Cell Growth And Lipid Content For Biofuel Feedstock Production, Beatrice Gabriela Terigar
Optimizing Light Requirements And Dilution Rates For Maximizing Algal Cell Growth And Lipid Content For Biofuel Feedstock Production, Beatrice Gabriela Terigar
LSU Doctoral Dissertations
There is a rapidly growing interest in the potential of microalgae as feedstock for the next generation of biofuels. The current study was designed to meet the following objectives: (1) Investigate the interdependence among cell density, biomass and lipid productivity to maximize feedstock production from outdoor cultures; (2) Investigate the effect of cycling high-intensity lights to identify optimum Dark:Light (D/L) ratios, which can be effectively used by researchers to maximize aerial biomass productivities; (3) Develop a deterministic model to simulate the biomass productivity in an continuous-flow bioreactor at various hydraulic retention times. Results indicated that variation in HRTs has a …
Single-Crystal Metal Oxides And Supported Metal Nanoclusters As Model Catalyst Sytems, Matthew C. Patterson
Single-Crystal Metal Oxides And Supported Metal Nanoclusters As Model Catalyst Sytems, Matthew C. Patterson
LSU Doctoral Dissertations
We have investigated the morphology and electronic structure of two basic classes of systems: metal oxide surfaces that catalyze the formation of environmentally persistent free radicals (EPFRs) from aromatic precursors, and Au and Cu nanoparticles that may be suitable catalysts for the catalytic oxidation of CO or hydrogenation of CO2. First, we examine the adsorption behavior of phenol on rutile TiO2(110) and ultrathin films of alumina prepared on a NiAl(110) substrate. Electron paramagnetic resonance studies show that exposure of both γ-alumina and titania powder to phenol at 250°C results in the formation of persistent phenoxyl radicals. EELS studies of phenol …
Oligohaline Wetland Response And Recovery Following Storm-Driven Saltwater Intrusion In Coastal Louisiana, Whitney Marie Kiehn
Oligohaline Wetland Response And Recovery Following Storm-Driven Saltwater Intrusion In Coastal Louisiana, Whitney Marie Kiehn
LSU Doctoral Dissertations
Coastal ecosystems occupy an interface between land and ocean, making them vulnerable to a variety of natural and anthropogenic disturbances. Large, episodic disturbances (mega-disturbances) cause immediate and long-lasting changes to coastal wetland plant communities and soils by changing the environmental conditions in which they exist. Here I examined the impacts of storm-induced saltwater intrusion and post-intrusion conditions on the structure and growth of an oligohaline wetland plant community, and on wetland soil biogeochemistry and conditions during and after saltwater intrusion. In the greenhouse, a six-week saltwater intrusion reduced canopy cover and species richness. Once intrusion stress was alleviated, plant community …
Consumer's Preferences For Goat Meat In The United States : An Application Of Choice-Based Conjoint Analysis, Jessica Irene Hill
Consumer's Preferences For Goat Meat In The United States : An Application Of Choice-Based Conjoint Analysis, Jessica Irene Hill
LSU Doctoral Dissertations
The meat goat industry is one of the fastest growing agricultural sectors in the United States. However, there has been limited research on consumers’ preferences for goat meat; therefore, a choice experiment was used to assess consumer preferences for goat meat and/or live goats. A national online survey was conducted from April 27, 2012 to May 4, 2012. Respondents were asked to complete either the goat meat choice experiment, live goat choice experiment or both. In addition to the choice experiment, respondents answered a set of questions about goat meat consumption and purchasing behavior as well as demographics. The attributes …
Design, Synthesis, And Characterization Of Porphyrin Derivatives For Biological Applications, Raja Gabadage Waruna Eranga Jinadasa
Design, Synthesis, And Characterization Of Porphyrin Derivatives For Biological Applications, Raja Gabadage Waruna Eranga Jinadasa
LSU Doctoral Dissertations
Chapter 1 of this Dissertation presents a brief introduction to the basic properties of porphyrins and their derivatives (hydroporphyrins), their abundance and functions in the nature, and their applications in photodynamic therapy. Chapter 2 reports the synthesis, characterization, conformational analysis and cellular studies of novel mono conjugated regioisomers of chlorin e6 derivatives that are promising photosensitizers for photodynamic therapy. All three regioisomers were synthesized from pheophytin a, which was extracted from the alga Spirulina pacifica. In vitro investigations using human carcinoma HEp2 cells show that the 152-lysyl regioisomers accumulate the most within cells, and the most phototoxic …
A Study Of The Temporal And Spatial Distribution Of Ichthyoplankton And Post-Larval Penaeids Recruiting Into A Louisiana Tidal Pass, Matthew John Kupchik
A Study Of The Temporal And Spatial Distribution Of Ichthyoplankton And Post-Larval Penaeids Recruiting Into A Louisiana Tidal Pass, Matthew John Kupchik
LSU Doctoral Dissertations
This dissertation attempts to better understand astronomical, meteorological, and oceanographic forcing of offshore-spawned, estuarine-dependent species from continental shelf to estuarine waters through tidal passes. The vertical distribution of zoo-/ichthyoplankton within the inner continental shelf from the Louisiana Offshore Oil Platform monitoring project (1978-1995) provided an important offshore end member for the estuarine recruitment study, and is potentially useful in predicting vulnerabilities to past and future oil spills. The role that atmospheric cold front passages may have on densities and movement of zoo-/ichthyoplankton recruiting through the Bayou Tartellan tidal pass, Louisiana, were analyzed using a Generalized Additive Model. The pre-frontal phase, …