Digital Commons Network^™

Preferences Of Louisiana Agronomic Crop Producers And Crop Consultants Regarding Sources Of Information Related To Agricultural Production, Kenneth Craig Gautreaux

LSU Doctoral Dissertations

The dissemination of information related to agronomic crop production is crucial to the success of the agriculture industry in Louisiana. This information is distributed by various sources and through multiple methods. The primary purpose of this study was to determine the preferences of Louisiana agronomic crop producers and crop consultants in regards to acquiring information related to their agricultural operations. A secondary purpose was to determine how agronomic crop producers perceived selected LSU AgCenter information sources on accuracy, awareness and frequency of use. Data for the study were obtained through surveys completed by 176 agronomic crop producers and 32 crop …

Numerical Studies Of Flow In Porous Media Using An Unstructured Approach, Nathan Matthew Lane

LSU Doctoral Dissertations

Flow and transport in porous media is relevant to many areas of engineering and science including groundwater hydrology and the recovery of oil and gas. Porous materials are characterized by the unique shape and connectivity of the internal void structures which give rise to a large range in macroscopic transport properties. Historically an inability to accurately describe the internal pore-structure has prevented detailed study of the role of pore structure on transport. In recent decades however, the combination of high resolution imaging technologies with computational modeling has seen the development of fundamental pore-scale techniques for studying flow in porous media. …

Female Perceptions Of Technology Education At Old Dominion University, Brian Reynolds

OTS Master's Level Projects & Papers

The problem of this study was to determine the perceptions of technology education among female Darden College of Education students at Old Dominion University and their willingness to switch career paths.

Analytical Design Method For Cold Production Of Heavy Oil With Bottom Water Using Bilateral Sink Wells, Wenting Qin

LSU Doctoral Dissertations

Few heavy oil reservoirs with strong bottom water drives have been developed successfully because of severe water coning. Water coning tends to cause low ultimate recovery, low well productivity, and high water production. Although thermal and gravity-assisted methods might improve recovery in oil reservoirs, such methods are widely perceived as either economically unfavorable or technologically infeasible. This study proposes a new, cold production technique, called Bilateral Water Sink (BWS), to meet those challenges. The BWS method suppresses water cresting by producing oil and water simultaneously from separate, horizontal wells completed in the oil and water zones; the oil and water …

Silicon Nanowire Anode For Lithium-Ion Batteries: Fabrication, Characterization And Solid Electrolyte Interphase, Wanli Xu

LSU Doctoral Dissertations

Depletion of fossil fuels and concerns over CO2 emission have driven the development of electric vehicles (EVs) with high-energy efficiencies and low emissions. Lithium-ion rechargeable batteries, compared to lead acid, nickel cadmium, nickel metal hydroxide, and other popular rechargeable batteries, are considered as the most promising candidates for EVs for their high operating voltage and high energy density. Silicon nanowires are considered as lithium-ion battery anodes for their ultra high capacity at 4200 mAh·g-1 (10× higher than conventional graphite anode), as well as stress accommodation for reversible lithiation and delithiation. Silicon nanowires were fabricated via metal assisted electroless etching, and …

The Influence Of Budget Allocation By Function On Student Retention Of Public Community Colleges In The Sixteen States In The Southern Region Education Board, Clayton Clendenin Burton

LSU Doctoral Dissertations

Stakeholders of higher education expect a positive return for their investment. One of the measures of success for higher education is persistence; one of the measures of persistence is retention rate. One segment of higher education, community colleges, receives a significant outlay of public resources in terms of government appropriations, student financial aid, and individual investment. This study follows the framework of Ryan (2004) and Gansemer-Topf and Schuh (2006) who successfully created models using the allocation of financial resources to predict graduation and retention rates for four-year colleges. Using data from the U. S. Department of Education’s Integrated Postsecondary Education …

Proteomic Analysis Of The Blood Of Alligator Mississippiensis, Lancia Nadinia Fallen Darville-Bowleg

LSU Doctoral Dissertations

My research focus was to investigate alligator blood using mass spectrometry-based proteomics methods to understand their innate immune systems. The first goal was to sequence peptides and proteins from the blood serum and leukocytes using tandem mass spectrometry and de novo sequencing. The second goal was to determine the function of these biological molecules and their relationship to the immune system. One- and two-dimensional gel electrophoresis was used to separate proteins from alligator leukocytes, which were enzymatically digested. The peptides were measured using reversed phase nano-high performance liquid chromatography coupled with tandem mass spectrometry (nano-HPLC-MS/MS) followed with de novo sequencing. …

Phase Noise In Cmos Phase-Locked Loop Circuits, Yang Liu

LSU Doctoral Dissertations

Phase-locked loops (PLLs) have been widely used in mixed-signal integrated circuits. With the continuously increasing demand of market for high speed, low noise devices, PLLs are playing a more important role in communications. In this dissertation, phase noise and jitter performances are investigated in different types of PLL designs. Hot carrier and negative bias temperature instability effects are analyzed from simulations and experiments. Phase noise of a CMOS phase-locked loop as a frequency synthesizer circuit is modeled from the superposition of noises from its building blocks: voltage-controlled oscillator, frequency divider, phase-frequency detector, loop filter and auxiliary input reference clock. A …

6.4 Ghz Acoustic Sensor For In-Situ Monitoring Of Afm Tip Wear, T.J. Cheng, Jun Hyun Han, Michael Ziwisky, Chung-Hoon Lee, S.A. Bhave

Electrical and Computer Engineering Faculty Research and Publications

This paper demonstrates an acoustic sensor that can resolve atomic force microscopy (AFM) tip blunting with a frequency sensitivity of 0.007%. The AFM tip is fabricated on a thin film piezoelectric aluminum nitride (AlN) membrane that is excited as a film bulk acoustic resonator (FBAR). We demonstrate that cutting 0.98 μm off of the tip apex results in a resonance frequency change of 0.4MHz at 6.387GHz. This work demonstrates the potential for in-situ monitoring of AFM tip wear.

Application Of Spatial Bandwidth Concepts To Mas Pole Location For Dielectric Cylinders, James Richie

Electrical and Computer Engineering Faculty Research and Publications

The concept of effective spatial bandwidth (EBW) is extended from the case of an MAS solution for perfectly conducting (PEC) cylinders to dielectric cylinders. It is shown that the ideas and results for the conducting cylinder apply in a straightforward manner to the dielectric case. For the dielectric case, there are two auxiliary surfaces. Because the EBW calculations are independent of the scatterer material, the auxiliary surface for the scattered field will follow the same guidelines for both the PEC and dielectric cases. The guidelines for the second auxiliary surface are described and verified here. Guidelines for both a plane …

Market Intermediaries And Rural People In Bolivia's Forest Products Sector: Are Trusting Partnerships Possible?, James T. Murphy, Mary Lawhon

Geography

Decentralization in access to and control of Bolivia's forest resources, coupled with a rising global demand for tropical hardwoods, raises important questions about whether increased trade and community forest management (CFM) initiatives can enable forms of market integration that have more favourable outcomes for rural communities. This paper assesses the prospects for such a transition through an examination of the relationships linking wood product market intermediaries (brokers and buyers) to rural suppliers and forest communities in Bolivia. The analysis centres on whether trust - conceptualized as a power-laden sociospatial process driven by multiscalar factors - can evolve between buyers and …

Theorizing Practice In Economic Geography: Foundations, Challenges, And Possibilities, Andrew Jones, James T. Murphy

Geography

Over the last decade or so there has been an identifiable shift in the interests of many economic geographers towards a concern with practices: stabilized, routinized, or improvised social actions that constitute and reproduce economic space, and through and within which socioeconomic actors and communities embed knowledge, organize production activities, and interpret and derive meaning from the world. Although this shift has gained significant momentum its general theoretical significance remains somewhat unclear and the concept is vulnerable to criticisms that it is incoherent, too 'micro-scale' in emphasis, unable to provide valid links between everyday practices and higher-order phenomena (eg, institutions, …

Sensory Discrimination Testing With Children, Karen Melissa Garcia

LSU Doctoral Dissertations

Literature concerning children’s performance in sensory discrimination methods is not as extensively published as performance with adults. Therefore, in this dissertation children’s performance in discrimination methods was investigated. First, performance in the triangle and 3-AFC methods was explored with children 6 to 12 years old. The paradox of discriminatory non-discriminators states that the proportion of correct responses in the 3-AFC method will be higher than that of the triangle. However, Thurstonian theory predicts that despite the difference in proportions of correct responses the degree of difference between the stimuli will be similar. The paradox and the Thurstonian predictions were challenged …

Making Transitions: A Multiple Case Study Of Mathematics Classroom Teaching Reform In China, Lianfang Lu

LSU Doctoral Dissertations

The main purpose of this study is to investigate how teachers implemented teaching reform in secondary mathematics classrooms in China, and to understand the context of teaching transformation in general. Two groups of mathematics teachers were included in this study. One group was involved in a leadership project led by university-based mathematics teacher educators, and the other was engaged in a school teaching experiment led by teacher educators from local education department. In this study, classrooms are viewed as social systems in which the teacher and students are interrelated through communication networks. This study examines the structures, patterns of social …

Fully Integrated Microsystem For Bacterial Genotyping, Hui-Wen Chen

LSU Doctoral Dissertations

Methods for bacterial detection and identification has garnered renewed interest in recent years due to the infections they may cause and the antimicrobial resistances they can develop, the potential for bioterrorism threats and possible contamination of food/water supplies. Therefore, the rapid, specific and accurate detection of pathogens is crucial for the prevention of pathogen-related disease outbreaks and facilitating disease management as well as the containment of suspected contaminated food and/or water supplies. In this dissertation an integrated modular-based microfluidic system composed of a fluidic cartridge and a control instrument has been developed for bacterial pathogen detection. The integrated system can …

Kinetics And Mechanisms Of Release By Redox-Active Liposomes In Drug Delivery, Jerimiah Forsythe

LSU Doctoral Dissertations

Liposomes have had a long and fruitful application of drug delivery devices in the treatment of select tumors and cancer types. Third-generation liposomes possess endogenous triggering methods that hold the ability for site-specific unloading of liposomal contents, thus providing necessary temporal and spatial control over contents release that can be tuned to match the drug efficacy for decreased side effects during treatment. Of these new endogenous triggers, redox-active liposomes that can be triggered to unload contents via two-electron reduction by enzymes or chemical means have demonstrated promise for the encapsulation and delivery of cargo. The research project undertaken involved the …

Understanding The Role Of Expectation Disconfirmation Theory On It Outsourcing Success, Colleen Schwarz

LSU Doctoral Dissertations

Outsourcing has become a ubiquitous phenomenon, but IT outsourcing success has been elusive. Over half of the outsourcing contracts are ended prematurely and some organizations are beginning to backsource. This research employs a unique lens to understand outsourcing. Although most IT outsourcing studies employ absolute success measure, this research utilizes expectations and disconfirmations to predict success. Specifically, the Expectation Disconfirmation Theory is used to understand the role of various types of expectations on IT outsourcing success. A Delphi study of IT outsourcing experts in addition to a survey on success is utilized to present a triangulation of data to support …

Bio-Implantable Microdevices And Structures For Functional Electrical Stimulation Applications, Naga Srinivas Korivi

LSU Doctoral Dissertations

This dissertation describes the development of microstructures and devices for applications in functional electrical stimulation. A nerve cuff electrode design has been developed for applications in neural electrical stimulation and recording, which addresses limitations with existing cuff electrodes. The developed clip-on micro-cuff electrode design consists of a naturally closed cuff with inner diameter in the micro-scale or above. A novel pinch-hinge feature allows a user to easily open the cuff and place it on target nerve tissue for stimulation or recording purposes. Upon release of the pinch-hinge, the cuff assumes its normally closed nature. The device conducts and reads electrical …

"Baby, Dream Your Dream": Pearl Bailey, Hello, Dolly!, And The Negotiation Of Race In Commerical American Musical Theatre, Charles Eliot Mehler

LSU Doctoral Dissertations

In October of 1967, producer David Merrick closed his successful production of Hello, Dolly! Merrick reopened the show one month later with an all-black cast that featured the talents of performers Pearl Bailey and Cab Calloway. While this Bailey Dolly! was a mammoth commercial success, this production brought attention to various problems concerning the interaction of black and white creative and performing talent in the venue of commercial American musical theatre. One such problem involved the risk of possible loss of genuine black culture and ignorance of recalcitrant intra-black-community difficulties and the extent to which African Americans should have desired …

Application Of Scanning Probe Microscopy For New Physical Measurements And Studies Of Surface Chemical Reactions Of Materials At The Molecular Level, Stephanie Loletha Daniels

LSU Doctoral Dissertations

Scanning probe microscopy (SPM) provides unique capabilities for surface visualization and measurements that reach atomic and molecular dimensions. My research focus is directed toward applying and developing new measurements for analytical and surface chemistry with SPM. Two distinct goals based on studies with atomic force microscopy (AFM) will be described within this dissertation. The primary goal was to develop and apply a new AFM imaging mode for ultrasensitive measurements of the superparamagnetic properties of proteins. Magnetic sample modulation (MSM)-AFM, has capabilities to investigate and map the magnetic response of nanomaterials with unprecedented spatial resolution. The second goal was to apply …

Radical Realms: A Materialist Theory Of Fantasy Literature, Rich Paul Cooper

LSU Doctoral Dissertations

This dissertation offers a materialist theory of fantasy as the literature of estranged cognition, an entirely novel perspective that challenges all of the existing criticism on fantasy literature by proposing an outlook that emphasizes not impossibility, but infinite possibility. During the late-Victorian period, the form of the fairy tale shifted from the literary fairy tale to ‘fantasy.’ Three formal characteristics reveal that fantasy literature derives from the fairy tale: an indication, thematically or formally, that another dimension has been entered; the making and remaking of genres—stories—in dialectically overdetermined configurations; and a textual conflation between physics and ethics that results in …

George Enescu's Concertstück For Viola And Piano: A Theoretical Analysis Within The Composer's Musical Legacy, Simina Alexandra Renea

LSU Doctoral Dissertations

The purpose of this monograph was to understand George Enescu’s Concertstück for viola and piano from the broad perspective of Enescu’s multiple facets of musicianship: composer, performer (violin, piano, conducting), and teacher. Moreover, the Romanian background (including musical education and direct knowledge of Romanian folklore) of this monograph’s author facilitated in a higher degree the achievement of the given purpose. The document is divided into three chapters. Chapter 1 describes Enescu as composer, performer, and teacher. The first part of Chapter 1 offers information about the most important influences on his composition style (including his teachers), and his main works …

The Attitudes Of African American Students Towards The Study Of Foreign Languages And Cultures, Katrina Watterson

LSU Doctoral Dissertations

This dissertation explores the reasons that African American students participate at lower levels in foreign language programs in terms of taking courses and majoring and minoring in foreign languages. The primary foreign language that it explores is Spanish, and its findings suggest that the introduction of the language devoid of the influence of Afro-diasporic linkages to Spanish culture leads to the topic being taught in abstraction, therefore causing a lack of interest among African American students. As this study shows, a teacher's thinking about cultural and racial difference is often intimately woven into their disciplinary training, and as a result, …

Damage Detection And Identification In Fiber Reinforced Plastic Structural Members And Field Bridges Using Acoustic Emission Technique, Archana Nair

LSU Doctoral Dissertations

With the increased use of fiber reinforced polymer (FRP) based structural systems for rehabilitation of existing and construction of new bridges there is a requirement for identification of critical components of these structural systems and the determination of critical damage thresholds in them. Of the many available non-destructive techniques (NDT), acoustic emission (AE) monitoring had been identified as one of the most popular techniques applicable for damage discrimination in composites. The current study aimed at using patterns in AE data for the identification of damage modes exhibited by composite structural systems. The extensive experimental program involved testing of two structural …

Cognitive Radio Network With A Distributed Control Channel And Quality-Of-Service Solution, Urban Terrell Wiggins

LSU Doctoral Dissertations

The proliferation of wireless access and applications to the Internet and the advent of a myriad of highly evolved portable communication devices; creates the need for an efficiently utilized radio spectrum. This is paramount in the licensed and unlicensed radio frequency bands, that spawn an exponential growth in Dynamic Spectrum Access (DSA) research, Cognitive Radio (CR) and Cognitive Radio Networks (CRN) research. DSA research has given way to the paradigm shift toward CR with its dynamic changes in transmission schemas. This paradigm shift from a fixed and centralized frequency spectrum environment has morphed into a dynamic and decentralized one. CR …

In-Wheel Motors: Express Comparative Method For Pmbl Motors, Pavani Gottipati

LSU Doctoral Dissertations

One of the challenges facing the electric vehicle industry today is the selection and design of a suitable in-wheel motor. Permanent Magnet Brushless (PMBL) motor is a good choice for the in-wheel motor because of its lossless excitation, improved efficiency, reduced weight and low maintenance. The PMBL motors can be further classified as Axial-Flux Twin-Rotor (AFTR) and Radial-Flux Twin-Rotor (RFTR) machines.

The objective of this dissertation is to develop a fast method for the selection of appropriate in-wheel motor depending on wheel size. To achieve this, torque equations are developed for a conventional single-rotor cylindrical, twin-rotor axial-flux and twin-rotor radial-flux …

Evaluation Of The Physicochemical Properties And Stability Of Solid Lipid Nanoparticles Designed For The Delivery Of Dexamethasone To Tumors, Melissa Howard

University of Kentucky Doctoral Dissertations

Pre-clinical and clinical trials suggest that pre-treatment with dexamethasone (Dex) may facilitate enhanced uptake of subsequently administered chemotherapeutic agents. To reduce the side effects associated with systemic administration of Dex, solid lipid nanoparticles (SLNs) containing dexamethasone palmitate (Dex-P) were prepared as a means of achieving tumor-targeted drug delivery. These studies were aimed at evaluating the physicochemical properties and both the physiological and storage stability of the SLNs.

SLNs were prepared using nanotemplate engineering technology. Stearyl alcohol (SA) was used as the lipid phase with Brij^® 78 and Polysorbate 60 as surfactants and PEG6000 monostearate as a long-chain PEGylating agent. …

New Accurate Fault Location Algorithm For Parallel Transmission Lines, Pramote Chaiwan

University of Kentucky Doctoral Dissertations

Electric power systems have been in existence for over a century. Electric power transmission line systems play an important role in carrying electrical power to customers everywhere. The number of transmission lines in power systems is increasing as global demand for power has increased. Parallel transmission lines are widely used in the modern transmission system for higher reliability. The parallel lines method has economic and environmental advantages over single circuit. A fault that occurs on a power transmission line will cause long outage time if the fault location is not located as quickly as possible. The faster the fault location …

Depositional And Stratigraphic Significance Of Marine, Green-Clay, Mineral Facies In The Lower-Middle Mississippian Borden And Fort Payne Formations, Western Appalachian And Eastern Illinois Basins, Kentucky, Devi Bhagabati Prasad Udgata

University of Kentucky Doctoral Dissertations

Detailed study of strata associated with the glauconite-rich Floyds Knob Bed in the western Appalachian and eastern Illinois basins have corroborated previous interpretations that the unit is a widespread, largely synchronous marker horizon. However, in some areas there are multiple glauconite beds; in others a distinct bed is lacking, but the glauconite is dispersed throughout many beds, forming an interval rather than a distinct bed. In Kentucky and adjacent states, the Floyds Knob interval, in upper parts of the Lower-Middle Mississippian Borden-Grainger delta sequence and in lower parts of the Fort Payne carbonate sequence, was deposited at the end of …

Isolation And Elucidation Of The Chrysomycin Biosynthetic Gene Cluster And Altering The Glycosylation Patterns Of Tetracenomycins And Mithramycin-Pathway Molecules, Stephen Eric Nybo

University of Kentucky Doctoral Dissertations

Natural products occupy a central role as the majority of currently used antibiotic and anticancer agents. Among these are type-II polyketide synthase (PKS)-derived molecules, or polyketides, which are produced by many representatives of the genus Streptomyces. Some type-II polyketides, such as the tetracyclines and the anthracycline doxorubicin, are currently employed as therapeutics. However, several polyketide molecules exhibit promising biological activity, but due to toxic side effects or solubility concerns, remain undeveloped as drugs.

Gilvocarcin V (GV) (topoisomerase II inhibitor) has a novel mechanism of action: [2+2] cycloaddition to thymine residues by the 8-vinyl side chain and cross-linking of histone …