Digital Commons Network^™

Effect Of Bulk Flow Modulations On A Normal Jet In Crossflow At A Mean Blowing Ratio Of 0.25, Jeremiah Oertling

LSU Master's Theses

An experimental wind tunnel has been designed, built, outfitted with automated hot wire anemometry and laser sheet imagery systems methods of instrumentation and tested with the purpose of performing scientific research on the control and stabilization of a jet issuing 90 degrees into a crossflow. After the design and system characterizations were performed, the system was employed as a experimental platform to conduct an investigation of bulk flow modulation of a jet in crossflow. The Mean Blowing ratio investigated was set at 0.25, and the effect of duty cycle, peak to peak blowing ratio and frequency of excitation are investigated. …

Em Algorithm For Multiple Wideband Source Localization, Kiran Kumar Mada

LSU Master's Theses

A computationally efficient algorithm using the expectation-maximization (EM) algorithm for multiple wideband source localization in the near field of a sensor array/area is addressed in this thesis. Our idea is to decompose the observed sensor data, which is a superimposition of multiple sources, into the individual components in the frequency domain and then estimate the corresponding location parameters associated with each component separately. Instead of the conventional alternating projection (AP) method, we propose to adopt the EM algorithm in this work; our new method involves two steps, namely Expectation (E-step) and Maximization (M-step). In the E-step, the individual incident source …

Theory Of Curvature-Dependent Disjoining Pressure And Its Application To Liquid Films, Jin Zhang

LSU Doctoral Dissertations

A liquid film of thickness h < 100 nm is subject to additional intermolecular forces, which are collectively called disjoining pressure Pi. Since Pi dominates at small film thicknesses, it determines the stability and wettability of thin films. Current theory for uniform films gives Pi = Pi(h). It becomes unbounded as h -> 0. We present a theory of curvature-dependent disjoining pressure. The new Pi depends on the curvature hxx, slope hx, and h. When this theory is implemented for Lennard-Jones liquid films, the new Pi is bounded as h -> 0. We show that this Pi captures three regimes of drop behavior (complete wetting, partial wetting, and pseudo partial wetting) without altering the signs of the long and short-range interactions. We also find that a drop with a uniform film is linearly stable, whereas a drop without a uniform film is unstable. Evaporating thin films is …

Ab Initio Molecular Dynamics Simulations Of Methylaluminoxane (Mao) Synthesis By Hydrolysis Of Trimethylaluminum, Lacramioara Negureanu

LSU Doctoral Dissertations

MAO is the co-catalyst in the metallocene catalytic systems, which are widely used in single site olefin polymerization due to their high stereoselectivity. To date, the precise structure of MAO, the particular compound or compounds catalytically active in MAO, have eluded researchers. MAO, a white amorphous powder, is not a good sample for a direct spectroscopic characterization, and its NMR spectra are broad and almost featureless. Many structural models have been proposed but none are generally accepted. In the first part of this work the MAO formation mechanism was addressed. Molecular dynamics simulations at MP2 configuration interaction theory level have …

Application Of Short-Term Sediment Dynamics And Particle-Bound Phosphorus Fractionation Methods (Sedex) To Estimate The Benthic Nutrient Loading Potential In Upper Newport Estuary, California, Hilary Amanda Collis

LSU Master's Theses

Estuaries act as sources, sinks, and biogeochemical transformation sites for natural and anthropogenically-derived nutrients. Sediment loading from watersheds provides an important source of particulate nutrients to estuaries often neglected when constructing nutrient budgets. Deposition and resuspension of these sediments are known to impact biogeochemical cycles in estuarine environments. Phosphorus (P) exists in many forms in aquatic environments, and increased P loading to coastal environments increases primary productivity potentially leading to eutrophication. Magnitude and variability of sediment deposition, resuspension, and sediment-bound P concentrations were evaluated in Upper Newport Bay (UNB), California. During 2004, seven push cores were collected from the intertidal …

Effects Of Fire On Habitat Associations, Abundance, And Survival Of Wintering Henslow's Sparrows (Ammodramus Henslowii) In Southeastern Louisiana Longleaf Pine Savannas, Erik Ivan Johnson

LSU Master's Theses

The Henslow’s Sparrow (Ammodramus henslowii) is the fastest declining short-distance migrant and fastest declining grassland bird in North America. Declines in longleaf pine (Pinus palustris) savannas, its primary wintering habitat, have exceeded 97%. Other than basic habitat requirements, very little is known about its wintering ecology. I examined habitat associations of wintering Henslow’s Sparrows resulting from fire in longleaf pine savannas in southeastern Louisiana during two winters. Because it is important to understand the relative importance of habitat parameters, which include structure, species composition, and food availability, I measured these to determine their relative importance to Henslow’s Sparrow densities. I …

Investigation Into The Dirhodium-Catalyzed Hydroformylation Of 1-Alkenes And Preparation Of A Novel Tetraphosphine Ligand, Alexandre R. Monteil

LSU Doctoral Dissertations

The reaction of the tetraphosphine ligand rac-et,ph-P4 (et,ph-P4 = PEt₂CH₂CH₂(Ph)PCH₂P(Ph)CH₂CH₂PEt₂) with 2 equiv. of [Rh(nbd)₂]⁺ (nbd = norbornadiene) generates [rac-Rh₂(nbd)₂(et,ph-P4)]²⁺, which is the precursor to a highly active and regioselective hydroformylation catalyst system. The “key” catalyst species generated under H₂/CO pressure has been proposed to be the dihydrido complex [rac-Rh₂H₂(ì-CO)₂(et,ph-P4)]²⁺, and represents one of the most dramatic example of homobimetallic …

The Beleaguered Gatekeeper: Protection Challenges Posed By Unhcr Refugee Status Determination, Michael Kagan

Scholarly Works

The number of individual Refugee Status Determination (RSD) applications received by United Nations High Commissioner for Refugees (UNHCR) offices worldwide nearly doubled from 1997 to 2001, while UNHCR’s RSD operations have been criticized for failing to implement basic standards of procedural fairness. Yet, although there is some literature critiquing how UNHCR determines refugee status, there is little literature examining whether UNHCR should do so, and if it should, when, where, and under what conditions.

UNHCR performance of RSD poses protection challenges because it is founded on a basic contradiction. On the one hand, government action is essential for effective refugee …

Gamete And Cell Technologies For Use In Biological Resource Banking, Liesl Nel-Themaat

LSU Doctoral Dissertations

Biological resource banking is becoming important for endangered species conservation. A series of experiments were conducted to address issues concerning collection and utilization of biomaterials from Gulf Coast Native (GCN) sheep (model species) (Ovis aries) and Eland antelope (Taurotragus oryx). In the first experiment, two ejaculates were collected 10 minutes apart from each of five rams three times a week for three weeks to maximize output and minimize handling time. Semen volume, concentration and total number of spermatozoa were significantly greater in first ejaculates, whereas pre-cooled, cooled and post-thaw motility, as well as sperm survival, were greater in second ejaculates. …

Grammatical Morphology Of Children Reared In Poverty: Implications For Specific Language Impairment, Sonja L. Pruitt

LSU Doctoral Dissertations

In the current study, the past tense systems of children reared in poverty were examined. Guiding the study was Rice and Wexler’s (1996) Extended Optional Infinitive (EOI) account, which makes a number of predictions about the past tense systems of children with specific language impairment (SLI). The goal of the current study was to determine if these predictions apply to other children with weak language systems, such as those reared in poverty. The participants included 15 six-year-olds from low-income backgrounds (LSES), 15 age-matched peers from middle-income backgrounds (AM), and 15 language-matched peers from middle-income backgrounds (LM). All were African American …

Biology And Chemical Ecology Of The Sugarcane Beetle And Integrated Pest Management Of Sweet Potato Soil Insects In Louisiana, Tara Parker Smith

LSU Doctoral Dissertations

Host plant preference and chemical ecology of the sugarcane beetle, Euetheola humilis were evaluated in greenhouse and laboratory studies. Sweet potato, Ipomoea batatas, was significantly preferred over all other plant species evaluated in a host plant preference test. Corn, Zea mays, and sugarcane, Saccharum spp., were the next most chosen plant species in the study. In olfactometer experiments, sugarcane beetles responded significantly more to beetle injured and mechanically injured roots vs. uninjured roots. Male and female beetles were also significantly more attracted to female conspecifics. Differences were not detected between sweet potato cultivars in olfactometer trials. Cultivar preference studies suggested …

A Historical Examination Of The Tradition Of Experience In The Teaching Of Literature In English Education, Deborah Davis Reed

LSU Doctoral Dissertations

By examining major documents for tensions regarding the teaching of literature in the field of secondary English education, this dissertation addressed the following questions: (1) What assumptions about learning and knowledge helped to shape the field? (2) To what extent does the field demonstrate consistency or change in its discourse defined-positions? and (3) How might current conversations in the field fit within a larger historical, social, and political context, thus equipping English educators to better articulate and situate their own pedagogical beliefs? Stephen Toulmin’s (1958) model of an argument served as a means of analyzing the field’s ongoing conversation about …

The Effects Of A Multistrategy Reading Comprehension Intervention On The Reading Skills Of University Athletes With Reading Deficits, Gerlinde Grandstaff-Beckers

LSU Doctoral Dissertations

A large number of entering college and university students are unable to derive meaning from print at age-expected levels. The purpose of this study was to determine the effectiveness of Collaborative Strategic Reading (CSR; Klingner, Vaughn, Dimino, Schumm, & Bryant, 2001) in improving the reading comprehension skills of underprepared college students. Sixteen (8 experimental and 8 control) first-time male college student athletes entering their freshman year at a research-intensive university in the southeastern United States participated in the study. An experimental design was implemented to address the following research question: What effects does a multistrategy reading comprehension intervention (i.e., CSR) …

A Probabilistic Approach For Modeling And Real-Time Filtering Of Freeway Detector Data, Shourie Kondagari

LSU Master's Theses

Traffic surveillance systems are a key component for providing information on traffic conditions and supporting traffic management functions. A large amount of data is currently collected from inductive loop detector systems in the form of three macroscopic traffic parameters (speed, volume and occupancy). Such information is vital to the successful implementation of transportation data warehouses and decision support systems. The quality of data is, however, affected by erroneous observations that result from malfunctioning or mis-calibration of detectors. The open literature shows that little effort has been made to establish procedures for screening traffic observations in real-time. This study presents a …

Using The Fasb's Qualitative Characteristics In Earnings Quality Measures, Abhijit Barua

LSU Doctoral Dissertations

In this study, I develop a measure of earnings quality by using qualitative characteristics of financial statement information specified in the Statement of Financial Accounting Concepts (SFAC) No. 2 (FASB 1980). I derive a summary measure of earnings quality by applying factor analysis on fifteen variables representing different components of two primary dimensions of earnings quality: relevance and reliability. I then test the validity of the earnings quality construct by examining whether the construct reflects decision usefulness that is operationalized in two ways: value relevance and cost of capital analyses. I provide empirical evidence suggesting that the earnings quality construct …

Essays On The Bayesian Estimation Of Stochastic Cost Frontier, Xia Zhao

LSU Doctoral Dissertations

This dissertation consists of three essays that focus on a Bayesian estimation of stochastic cost frontiers for electric generation plants. This research gives insight into the changing development of the electric generation market and could serve to inform both private investment and public policy decisions. The main contributions to the growing literature on stochastic cost frontier analysis are to 1. Empirically estimate the possible efficiency gain of power plants due to deregulation. 2. Estimate the cost of electric power generating plants using coal as a fuel taking into account both regularity restrictions and sulfur dioxide emissions. 3. Compare costs of …

Understanding An Indigenous Curriculum In Louisiana Through Listening To Houma Oral Histories, Nicholas Anthony Ng-A-Fook

LSU Doctoral Dissertations

Indigenous communities have inhabited Louisiana since time immemorial. However, the national project of teaching the rise of the West as a heroic story remains the curricular centerpiece in elementary and high school history classes in North America. As a curriculum theorist, and former science and history teacher, I am concerned with the ways in which my teachings of colonialism’s cultural, historical, and national narratives suppress and silence the stories of the colonized. Therefore, the purpose of this paper (based on a four-year qualitative study) is to share oral histories of the United Houma Nation in order to illustrate their daily …

Structural Performance Of Approach Slab And Its Effect On Vehicle Induced Bridge Dynamic Response, Xiaomin Shi

LSU Doctoral Dissertations

Differential settlement often occurs between the bridge abutment and the embankment soil. It causes the approach slab to lose its contacts and supports from the soil and the slab will bend in a concave manner. Meanwhile, loads on the slab will also redistribute to the slab ends, which may result in faulting (or "bump") at the slab ends. Once a bump forms, repeating traffic vehicles can deteriorate the expansion joint in turn. In this case, the vehicle receives an initial disturbance before it reaches the bridge. This excitation introduces an extra impact load on the bridge and affects its dynamic …

The Body Politic: Splitting Gender Medically In Eighteenth-Century Philadelphia, Sarah Sally Carraher

LSU Master's Theses

Before the rise of clinical medicine, Western medicine was undergoing several prerequisite shifts in epistemology and methodology - moving from an eighteenth-century practice of spaces and classes, wherein the symptom is synonymous with the disease, toward a nineteenth-century science of signs and cases, in which symptoms are symbols, or products, of a deeper disease (Foucault 1973). During the former age of classes, about mid-century, a particular shift in the medical perception of sex differences appears in the literature, without any great advances or revisions in human anatomical knowledge or treatment methods. This thesis looks at hospitalization of in-patients at Pennsylvania …

Characterization Of Beta-Amyloid Peptide Aggregation And Acceleration With Non-Fibrillar Forming Peptide-Based Mediators, Nadia J. Edwin

LSU Doctoral Dissertations

Protein aggregation occurs under many circumstances, from the dynamic assembly of tubulin to form microtubules, the aggregation of actin into filaments, as well as plaque formation by amyloid precipitation. One important requirement in studying the mechanism of amyloid aggregation is the ability to monitor the growth kinetics over a wide range in size scales (10 nm to microns) with time that spans microseconds to seconds. Understanding the mechanisms of the aggregation may then lead to improved design of drugs to help control or suppress the aggregation process. In this dissertation, the physical characterization of the â-amyloid peptide and its interaction …

Is Attention Unitary Or Divisible By Modality?, Sharon Diane Lynn

LSU Master's Theses

Using the attentional network task (ANT) developed by Fan et al. (2002) and a modification of this task, the development of selective attention in a bimodal (auditory and visual) task is measured and compared to the results and development of the visual version of the task. The theoretical purpose of the study was to determine whether the attentional mechanism involved in this task is organized as a single mechanism or into modality-specific mechanisms. It was shown that adults needed specific instructions to efficiently use the auditory spatial warning cues but instructions were not required for efficient use of visual spatial …

Federalism, Checks And The Welfare State: A Cross National Analysis, Amanda Louise Beal

LSU Master's Theses

It is often asserted in the institutional literature that there is a trade-off between effective and efficient government. Effective government is often stipulated to be more representative, while efficient government is considered superior at passing legislation. This analysis critiques Arend Lijphart's theory that consensus democracies are more representative, and therefore, result in "kinder, gentler" democracies with more encompassing social policies. I hypothesize that more representative government - operationalized as having higher levels of fractionalization within the legislature, more federalism and more checks within the system - is actually more effective at translating the median voter's preference for occupationally dependent or …

Toward A New Student Insurgency: A Critical Epistolary, Rachel J. Anderson, Marc-Tizoc Gonzalez, Stephen Lee

Scholarly Works

Taking the form of an epistolary (a collection of letters), this law review article explores the relationship between law and social change in the context of student activism at the University of California, Berkeley, School of Law (Berkeley Law formerly Boalt). The author’s contribution to this essay examines the simultaneously linear and circular history of social justice activism at Berkeley Law and discusses the relationship between social crises and resurging waves of activism, focusing on student activism in the sphere of legal scholarship.

Synthesis, Characterization And Properties Of Cooper(Ii) Beta-Diketonate Macrocycles, Sylvester Burton

LSU Doctoral Dissertations

This dissertation deals with the synthesis and properties of multidentate β-diketone ligands and their transition-metal complexes. (1) We prepared two bis(β-diketones), C₁BAH₂ and p-XBAH₂ (see sketch below), determined their crystal structures, and studied their reactions with copper(II). We envisioned that they would form macrocyclic complexes with 3-6 metal atoms. In both cases, although the initial products are soluble, as expected for the desired molecular products, we were unable to isolate well-behaved molecular solids. In the case of C₁BAH₂, this may be because the cyclic product requires an unusual combination of conformations of …

The Antipodes: On Rebellion, Michael Scott Robinson

LSU Master's Theses

This essay argues that the term rebellion applies to two similar but distinguishable experiences representative of the limits to human action and capacity. The political rebel is a man who rebels against an oppressive political regime. Opposing him is the metaphysical rebel whose action is inspired by a grievance against the nature of existence generally, as a human being, which he has interpreted to be oppressive. These contradicting inspirations are matched by juxtaposing consequences, exemplified through a literary analysis of Fyodor Dostoevsky’s novels, and a historical analysis of Václav Havel and the Velvet Revolution.

Characterization Of Equine Pulmonary Endothelin Receptors In Health And Disease, Sumanth Polikepahad

LSU Doctoral Dissertations

Endothelin-1 (ET-1) has been implicated in allergic type of respiratory inflammatory diseases in various species of animals including horses. This peptide elicits its actions by acting through endothelin-A (ET-A) and endothelin-B (ET-B) receptor sub-types. In this project, we have hypothesized that endothelin receptors (both ET-A and ET-B) are altered in terms of affinity and expression, in the lungs of summer pasture-associated obstructive pulmonary disease (SPAOPD)-affected horses. Objective of this dissertation was to determine the alterations in the affinity and expression of endothelin receptors in the lungs of healthy and SPAOPD-affected horses. To pursue our hypothesis, we have employed pharmacological, immunohistochemical …

Use Of Atomic Force Microscopy To Study A Molecular Micelle As An Anionic Polymer For Polyelectrolyte Multilayer Deposition On Polymeric Substrates, Angela Nakeeta Douglas

LSU Master's Theses

Polyelectrolyte multilayers (PEMs) have been used as stationary phases for various chiral and achiral separations in open-tubular electrochromatagraphy (OT-CEC). However, the physical characteristics of PEMs are not well understood. The production of PEM coatings involves flowing alternating rinses of positive and negative charged polyelectrolytes onto a surface. Although PEMs are typically deposited on fused silica capillaries, there is growing interest to use this approach in conjunction with microchip devices to enhance separation characteristics. Since microchips are fabricated using polymeric substrates, the deposition of PEMs on these substrates needs to be examined. The study reported in this thesis uses atomic force …

The Meaning Of Masculinity For Male Baccalaureate Nursing Program Graduates, Kenneth Tillman

LSU Doctoral Dissertations

Previous researchers have reported that societal definitions of masculinity may act as a barrier to men entering the nursing profession, and that men who do enter nursing may hold a different view of masculinity. The purpose of this study was to describe the meaning of masculinity for recent male baccalaureate nursing program graduates. In addition, the study explored how the participants’ perceived meaning of masculinity shaped or influenced their nursing education experiences, and in turn how their nursing education experiences may have shaped or influenced their perceived meaning of masculinity. A phenomenological research design was used to study eight male …

Mesoscale Predictions For The Dynamic Compaction Of Explosively-Coated Aluminum Micro-Particles, Michael Wayne Crochet

LSU Master's Theses

Conventional granular explosives are widely used in aerospace and defense-related industries. Powdered metals are often mixed with high explosives to enhance detonation. The effectiveness of these mixtures is limited by the slow burning of the metal relative to the explosive and their sensitivity to mechanical loading. Granular energetic composites, composed of an aluminum core coated with a layer of the high explosive RDX (C₃H₆N₆O₆), may be a high-performance alternative to conventional explosives because of a higher metal combustion rate and lower impact sensitivity. Though the technology required to manufacture granular energetic composites …

Color And Tenderness In Chilled Or Frozen Pork Loin Chops After Antioxident Dipping And Modified Atmosphere Packaging, Dennis Michael Price

LSU Master's Theses

The objective of this research was to evaluate color and tenderness in chilled or frozen pork loin chops after antioxidant dipping and modified atmosphere packaging. Loin chops were dipped in 0.3 M calcium chloride, 2.0 % sodium ascorbate, 0.2 M calcium ascorbate, or 0.3 M calcium ascorbate. Non-dipped chops served as controls. Chops were packaged in high oxygen (80% O2 / 20% CO2) or no oxygen (80% N2 / 20% CO2) and stored chilled (4° C) for 7 days or frozen (-18° C) for 21 days. After storage, chops were displayed under continuous fluorescent lighting for 3 or 6 days. …