Digital Commons Network^™

A Market-Based Approach For Valuing Ecosystem Services On Coastal Properties, Michelle A. Savolainen

LSU Doctoral Dissertations

As part of ongoing efforts to assess ecosystem services provided by wetlands, this research focuses on estimating the private monetary value of wetland services to residential property owners in Louisiana and Alabama using a hedonic price model. Understanding that tradeoffs must be made with limited resources, valuing ecosystem services is important for policy and decision making purposes, such as determining how much public and private financial resources should be put towards wetland maintenance and restoration. Data on property transactions, wetland coverage, and built infrastructure were collected for the analysis. Based on theory and results from a Box-Cox model, the log-linear …

All The Science That Is Fit To Blog: An Analysis Of Science Blogging Practices, Paige Brown Jarreau

LSU Doctoral Dissertations

This dissertation examines science blogging practices, including motivations, routines and content decision rules, across a wide range of science bloggers. Previous research has largely failed to investigate science blogging practices from science bloggers’ perspective or to establish a sociological framework for understanding how science bloggers decide what to blog about. I address this gap in previous research by conducting qualitative in-depth interviews with 50 science bloggers and an extensive survey of blogging motivations, approaches, content decisions rules, values and editorial constraints for over 600 active science bloggers. Results reveal that science blog content is shaped heavily by not only individual …

Has Teacher Tenure’S Time Passed?, Charles J. Russo

Educational Leadership Faculty Publications

A recent trial court order (Vergara v. State of California 2014), which Governor Jerry Brown has already appealed (Nagourney 2014), has sent shock waves through the ranks of teachers and their unions because it threatens what is perhaps educators’ most cherished prize: tenure.

In Vergara, the court invalidated five statutes addressing tenure, procedural safeguards relating to teacher dismissal, and seniority as violating the equal protection clause in the California constitution. The court ruled that the challenged laws “impose a real and appreciable impact on students’ fundamental right to equality of education and that they impose a disproportionate burden on poor …

Green Bank Telescope And Swift X-Ray Telescope Observations Of The Galactic Center Radio Magnetar Sgr J1745–2900, Ryan S. Lynch, Robert F. Archibald, Victoria M. Kaspi, Paul Scholz

Faculty & Staff Scholarship

We present results from eight months of Green Bank Telescope 8.7 GHz observations and nearly 18 months of Swift X-ray telescope observations of the radio magnetar SGR J1745–2900. We tracked the radio and X-ray flux density, polarization properties, profile evolution, rotation, and single-pulse behavior. We identified two main periods of activity. The first is characterized by approximately 5.5 months of relatively stable evolution in radio flux density, rotation, and profile shape, while in the second these properties varied substantially. Specifically, a third profile component emerged and the radio flux also became more variable. The single pulse properties also changed, most …

Social Functioning In Schizotypy: An Exploration Of Communicative Effectiveness Through Speech Analysis And Observer Rated Performance In A Socially Demanding Task, Tracey Lauren Auster

LSU Doctoral Dissertations

Individuals with schizotypal traits have demonstrated sub-clinical symptoms of psychosis (e.g. perceptual disturbances, self-reported social functioning impairment, self-reported memory problems, and delusions). However, the evidence has been mixed regarding what impairments exist, particularly with regards to social functioning domains. As schizotypy is posited to reflect an underlying vulnerability for development of clinical levels of psychosis/risk conversion, individuals with these traits are an important group to study in order to identify these vulnerabilities. Research has indicated that current measures of social functioning (whether they are localized objective measures of verbal and non-verbal communication or global self-report of functioning) are missing some …

Dwelling Poetically, Proceeding Orphically: The Platonic Tradition And The Heideggerian Humanism Of Ernesto Grassi, Geoffrey Alexander Leeves Bain

LSU Doctoral Dissertations

Martin Heidegger exerted an immense influence over twentieth century thought by providing profound insights into the nature of Being as well as scathing social critiques, focused on the destructive force of late modern technological reductionism. As part of Heidegger’s project, he elaborated upon a sophisticated history of Being in which two great monsters of Platonism and Humanism are cast as Antichrist and False Prophet. Subsequently, however, his own student Ernesto Grassi argued that Renaissance Humanism was not a stepping stone towards subjectivism and technological thinking, but rather stood in conformity with the fundamental essence of Heidegger’s own project. This study …

Towards The Realization Of Systematic, Self-Consistent Typical Medium Theory For Interacting Disordered Systems, Chinedu Ekuma Ekuma

LSU Doctoral Dissertations

This work is devoted to the development of a systematic method for studying electron localization. The developed method is Typical Medium Dynamical Cluster Approximation (TMDCA) using the Anderson-Hubbard model. The TMDCA incorporates non-local correlations beyond the local typical environment in a self-consistent way utilizing the momentum resolved typical-density-of-states and the non-local hybridization function to characterize the localization transition. For the (non-interacting) Anderson model, I show that the TMDCA provides a proper description of the Anderson localization transition in one, two, and three dimensions. In three-dimensions, as a function of cluster size, the TMDCA systematically recovers the re-entrance behavior of the …

Chemical Structure And Dynamics In Laminar Flame Propagation, Mohsen Ayoobi

LSU Doctoral Dissertations

The objective of this dissertation is to investigate fundamental aspects of premixed flame structures as well as flame dynamics that arise due to conjugate heat transfer in narrow channels. Laminar premixed combustion simulations in narrow 2D channels show that conjugate heat transfer allows for combustion of mixtures at small scales that are not flammable at normal conditions. To investigate the impact of conjugate heat transfer, preheated 1D cases with premixed H2/Air fuel are simulated for a wide range of operating conditions based on inlet temperature and equivalence ratio. For post-processing, Chemical Explosive Mode Analysis (CEMA, an eigen-analysis technique) is used …

Constitutive Modeling And Experiments For The Micro And Nano Behaviors In Metals, Cheng Zhang

LSU Doctoral Dissertations

This work addresses the micro- and nano-behaviors in metals through constitutive modeling and experiments. The size effect encountered during nanoindentation experiments, which is known as indentation size effect (ISE), is investigated for metal materials. The ISE is believed to be related with the strain gradient at small indentation depths. Geometrically necessary dislocations (GNDs) are formed in order to accommodate the strain gradient, which results in the increase in the material hardness. The grain boundaries in polycrystalline materials play an important role on the material hardness during nanoindentation experiments as there is a soften-hardening segment in the curve of hardness as …

Career Development Among College Students: Determining The Influence Of Career Services On Student Persistence To Graduation, Anne Wanjiku Sang

LSU Doctoral Dissertations

The primary purpose of this study was to determine the influence of participation in career services activities and selected demographic characteristics on the persistence to graduation among undergraduate students at a research university-very high research activity (RU/VH) in the Southern portion of the United States. The target population was all undergraduate students enrolled at a research university –very high research activity (RU/VH) in the Southern portion of the United States. The accessible population for this study was undergraduate students at one selected research university –very high research activity (RU/VH) in the Southern portion of the United States and the sample …

Evaluating And Increasing The Range Of Reinforcers For Individuals With Autism Spectrum Disorder, Megan Kliebert Wiggins

LSU Doctoral Dissertations

Prior research has demonstrated the utility of several preference-assessment methodologies to identify stimuli more likely to function as reinforcers for individuals with limited verbal repertoires. However, differing results have been obtained from studies evaluating the reinforcement effects of stimuli identified as high preference by one assessment method but low preference by another assessment method. The first focus of the project was to evaluate the reinforcing efficacy of edible and leisure items based on predictions from preference assessments. Results indicated that edible and leisure items approached frequently during a single-stimulus preference assessment but infrequently during a paired-stimulus preference assessment produced less …

Development And Optimization Of Non-Hydrostatic Models For Water Waves And Fluid-Vegetation Interaction, Ling Zhu

LSU Doctoral Dissertations

The primary objective of this study is twofold: 1) to develop an efficient and accurate non-hydrostatic wave model for fully dispersive highly nonlinear waves, and 2) to investigate the interaction between waves and submerged flexible vegetation using a fully coupled wave-vegetation model. This research consists of three parts. Firstly, an analytical dispersion relationship is derived for waves simulated by models utilizing Keller-box scheme and central differencing for vertical discretization. The phase speed can be expressed as a rational polynomial function of the dimensionless water depth, $kh$, and the layer distribution in water column becomes an optimizable parameter in this function. …

Investigating The Photorecombination Dynamics In Molecular High-Harmonic Spectra, Benjamin Parker Wilson

LSU Doctoral Dissertations

The work presented in this dissertation will relate the photorecombination dynamics to photoionization dynamics in SF6 utilizing the self-probing mechanism, high harmonic generation (HHG). This work specifically aims to establish parameters for which the comparison is applicable and the macroscopic complications inherent in HHG do not interfere with the extraction of dynamic information. The first part of this work established the macroscopic experimental apparatus necessary for consistent spectroscopic observation. It is shown that using a gas jet that is an order of magnitude shorter than the Rayleigh length of the driving laser results in more consistent harmonic spatial profiles and …

Three Essays On Land Ownership, Gender, And Agricultural Productivity In The Case Of Developing Countries, Krishna H. Koirala

LSU Doctoral Dissertations

This dissertation set out to evaluate the impact of land ownership and role of gender to the Filipino farmers and to investigate gender difference in agricultural productivity and technical efficiency of Malawian rural households. The first essay investigates the impact of land ownership on the productivity and technical efficiency of rice farmers in the Philippines. We use a 2007-2012 Loop Survey from the International Rice Research Institute (IRRI) and analyzed it by using a stochastic frontier function method. Results show that land ownership has a significant impact on technical efficiency. In particular, counter to the theory, the Comprehensive Agrarian Reform …

The Impact Of Financial Knowledge On Student Retention From The Second To The Third Year At A Public Research University, Eric N. Monday

LSU Doctoral Dissertations

The primary purpose of this study was to determine the influence of financial knowledge and selected demographic characteristics on student retention from the second to the third year at a public research university in the southern region of the United States. The accessible population was defined as students in the Fall 2013 entering freshman cohort who were enrolled in the Spring 2015 semester. Measurements including the independent variable represented by the financial knowledge score and 17 other independent variables were collected using a survey instrument and downloaded data from the university’s electronic student information system. A total of 695 students …

Empire Of Faith: Toleration, Confessionalism And The Politics Of Religious Pluralism In The Habsburg Empire, 1792-1867, Scott Michael Berg

LSU Doctoral Dissertations

The issues of religious toleration and confessionalism are complex, with deep roots and unresolved, enduring legacies. This project takes a look on one sustained attempt to tackle this problem by looking at the Habsburg Empire after the death of Joseph II (r. 1780-1790), whose far-reaching reforms established extensive state control over the Catholic Church and introduced toleration for Protestants, Orthodox Christians and, in a more limited way, to Jews. Yet ultimately, religious toleration was one of the many factors that caused Joseph’s reign to end in failure. In addition, the French Revolution and Napoleonic Wars created conditions that promoted confessionalism, …

Time-Resolved Investigations Of Continuous Flow Synthesis Of Nanomaterials And Catalysis Using Millifluidic Reactors For Biomass Conversion Reactors, Chelliah V Navin

LSU Doctoral Dissertations

Millifluidics can be used as a simple tool and convenient platform to perform in-situ investigations on nanoparticles synthesis to generate real-time information in a continuous flow fashion. These investigations can be used to observe the relationship between the structure and performance of nanoparticles for catalytic applications as a function of space and time. These improvements in nanoparticles research offer unique advantages to develop catalysts with molecular strategies. In order to showcase these advantages of the millifluidic reactors, here we: A. Extensively covered a complete literature review on Lab-on-a-chip devices for gold nanoparticle synthesis and as a catalyst support for continuous …

Impact Of The S.T.R.I.P.E.S. Leadership And Extended Orientation Program On Philanthropic Giving, Beverly Brooks Thompson

LSU Doctoral Dissertations

This study investigated the impact participating in S.T.R.I.P.E.S., a leadership and extended orientation program, had on the philanthropic giving of recent alumni at a research university in the Southeastern United States. The dependent variable for this study was philanthropic giving to the institution during the three years immediately following graduation, as defined by their personal donations as recorded in cumulative giving by the university’s foundation. The goal of the study was to determine to what extent, if any, school leadership development, loyalty, and engagement taught through leadership and extended orientation programs influence the donation behavior of recent graduates. The target …

Bioplastic Production In Cyanobacteria And Consensus Degenerate Pcr Probe Design, Courtney Edward Lane

LSU Doctoral Dissertations

Cyanobacteria show much promise in reducing biodegradable thermoplastic production costs; however, most currently characterized strains are ill-equipped to do so. The result of Objective I produced a high-throughput assay designed to discover existing cyanobacterial strains and rapidly characterize them as PHA-producers or potential PHA-producers. This assay will play an instrumental role in the attainment of a novel cyanobacteria environmental isolate capable of accumulating high levels of PHA naturally. Objective II produced an open source computer program which dramatically speeds the design of similar assays for any arbitrary genetic screening purpose. The program is not limited to this implementation alone. In …

The Saxophone Symposium: An Index Of The Journal Of The North American Saxophone Alliance, 1976-2014, Ashley Kelly

LSU Doctoral Dissertations

The Saxophone Symposium is the journal of the North American Saxophone Alliance and is a peer-reviewed academic publication. Since 1976, its readership has enjoyed articles on a variety of saxophone related topics as well as reviews of contemporary recordings and publications. Aside from these academic applications, The Saxophone Symposium is an historical account of some of the saxophone culture in North America and beyond. Academic journals such as this are invaluable to both students and educators, and the ability to access the information within them is vital. Prior to the digital age, the majority of serious academic journals have been …

Regulation Of The Chloride Store In The Retinal Amacrine Cells, Vijai Krishnan

LSU Doctoral Dissertations

Nitric Oxide (NO) is a key gaseous messenger that has been shown to be produced by multiple cell types in the vertebrate retina. Research in our lab is aimed at unlocking critical synaptic functions of NO. A major finding from our lab is that NO affects synaptic responses in amacrine cells by altering the plasma membrane gradient for Cl-. This is due to release of Cl- from an internal store and this in turn dependent on a decrease in cytosolic pH. Determining the factors regulating cytosolic Cl- in neurons is fundamental to our understanding of the function of GABAergic and …

Hybrid Electronic Materials: Characterization And Thin-Film Deposition, Kalyan Chakravarthy Kanakamedala

LSU Doctoral Dissertations

Hybrid Electronic Materials (HEMs), as defined for this dissertation, are combinations of organic and inorganic materials as may be used to fabricate active device components in “beyond the transistor” electronics. However, the use of organics is often limited by issues such as thermal stability, compatibility with traditional (semiconductor) materials, and current processing technology. Thus, we began our exploration of HEMs with a “new” class of materials called GUMBOS (Group of Uniform Materials Based on Organic Salts) as derived from ionic liquids. For this first segment of our work, we investigated selected species of GUMBOS and nanoGUMBOS via their current-voltage characteristics, …

Molecular Dynamics Simulation Study Of Single Dna Nucleotides Transport Through Nanoslits, Kai Xia

LSU Doctoral Dissertations

There is potential for flight time based DNA sequencing involving disassembly into individual nucleotides which would pass through a nanochannel with 2 or more detectors. Molecular dynamics simulation of electrophoretic motion of single DNA nucleotides through 3 nm wide hydrophobic slits was performed. Electric field strength (E) varied from 0.0 to 0.6 V/nm. Slit walls were smooth or had a roughness similar to nucleotide size. Multiple nucleotide-wall adsorptions occurred. The electric field did not influence the nucleotide adsorption and desorption mechanism for E ¡Ü 0.1 V/nm, but influenced nucleotide orientation relative to the field direction. The nucleotide-wall interactions differed due …

Constraining The Solution To The Last Parsec Problem With Pulsar Timing, Laura Sampson, Neil J. Cornish, Sean T. Mcwilliams

Faculty & Staff Scholarship

No abstract provided.

Continuous Wave Cavity Ring-Down Spectroscopy For Velocity Distribution Measurements In Plasma, D. Mccarren, E. Scime

Faculty & Staff Scholarship

No abstract provided.

Coupled Oscillator Model For Nonlinear Gravitational Perturbations, Huan Yang, Fan Zhang, Stephen R. Green, Luis Lehner

Faculty & Staff Scholarship

Motivated by the gravity/fluid correspondence, we introduce a new method for characterizing nonlinear gravitational interactions. Namely we map the nonlinear perturbative form of the Einstein equation to the equations of motion of a collection of nonlinearly-coupled harmonic oscillators. These oscillators correspond to the quasinormal or normal modes of the background spacetime. We demonstrate the mechanics and the utility of this formalism within the context of perturbed asymptotically anti-de Sitter black brane spacetimes. We confirm in this case that the boundary fluid dynamics are equivalent to those of the hydrodynamic quasinormal modes of the bulk spacetime. We expect this formalism to …

Connected Vehicle Technology: User And System Performance Characteristics, Osama Abdulmonaem Thabet Osman

LSU Doctoral Dissertations

The emerging connected vehicle (CV) technology plays a promising role in providing more operable and safer transportation environments. Yet, many questions remain unanswered as to how various user and system characteristics of CV-enabled networks can shape the successful implementation of the technology to maximize the return on investment. This research attempts to capture the effect of multiple factors such as traffic density, market penetration, and transmission range on the communication stability and overall network performance by developing a new CONnectivity ROBustness (CONROB) model. The model was tested with data collected from microscopic simulation of a 195 sq-mile traffic network and …

An Exploration Of How Closely Upper Elementary Magnet School Reading Teachers' Perceptions Of Evidence-Based Practices In Reading Compared To Actual Practices In Their Classrooms, Rhonda Ann Cross

LSU Doctoral Dissertations

The purpose of this study was to explore how closely upper elementary magnet school reading teachers’ perceptions of evidenced-based practices in reading compared to actual practices in their classrooms. Literacy instruction, beginning in the third grade, places more emphasis on comprehension and higher expectations on the students than in the early elementary grades. There has been little research conducted on how teacher beliefs about reading and their actual instructional practices affect reading scores on national tests. Perhaps in the understanding of teachers’ beliefs about evidenced-based practices and the actual instructional practices used in the classroom can help in the development …

Ambit Of Multiphase Cfd In Modelling Transport Processes Related To Oil Spill Scenario And Microfluidics, Abhijit Rao

LSU Doctoral Dissertations

During the ‘Deepwater Horizon’ accident in the deep sea in 2010, about 4.9 million barrels of oil was released into the Gulf of Mexico, making the spill one of the worst ocean spills in recent times. To mitigate the ill effects of the event on the environment, subsea injection of dispersants was carried out. Dispersant addition lowers the interfacial tension at oil/water interface and presence of local turbulence enhances the droplet disintegration process. The oil droplets contain a plethora of hydrocarbons which are soluble in water. In deep spill scenarios, droplets spend large amounts of time in water column; hence, …

Modeling Two-Phase Flow And Heat Transfer In Polygonal Microchannels, Sai Sashankh Rao

LSU Doctoral Dissertations

Microfluidics is a burgeoning research area with applications ranging from microfluidic cooling to biomolecule synthesis. Here we study two problems to gain an improved understanding of two-phase flow and heat transfer in microfluidic devices. We also study a third problem on boundary layer flow out of theoretical interest. In the first problem, we study the heat and mass transfer in polygonal micro heat pipes under small imposed temperature differences. A micro heat pipe, used in electronics cooling, consists of a closed polygonal microchannel filled with a wetting liquid and a long vapor bubble. We model the evaporation, fluid flow, and …