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Energy Dissipation And Entropy Generation During The Fatigue Degradation: Application To Health Monitoring Of Composites, Ali Kahirdeh

LSU Doctoral Dissertations

In this dissertation, an experimental approach for characterizing energy dissipation and degradation evolution in a woven Epoxy/Glass (G10/FR4) laminate subjected to fully reversed bending fatigue test is presented. Infrared thermography and acoustic emission are utilized to characterize the degradation progression. The results show similar evolutionary response indicating the presence of three degradation stages. The effect of the surface cooling on the fatigue life of the laminates is investigated both experimentally and analytically. The results show that the life of the laminate is highly dependent on the temperature and that surface cooling can significantly increase the fatigue life of the laminate. …

Linking Local Weather To Climate Change: One Year Of Twitter In The Us, Tatiana Molodtsova

Theses and Dissertations

There is a high level of scientific consensus on climate change. Nevertheless for climate change research to have any practical value, to develop public support for climate policies, the climate research results must find the way to general public. That is why it is important to understand how the public perception of climate change forms.

During the last decades there have been a number of studies on the factors affecting the level of public concern on climate change. Two major groups of factors are hypothesized to have the biggest influence on the level of public concern on climate change: extreme …

Correctional Education Programs: Institutional Predictors Of Availability, Shamilya Marielle Mitchell

Theses and Dissertations

Being a convicted felon can limit a person's life chances. Adding a lack of education and training to that felony conviction can further limit the ability to find stable employment and transition back into society. Correctional education programs can reduce recidivism rates, but there are a wide variety of programs and not every facility offers them. This study examines the institutional characteristics that predict the availability of vocational training and college course programs in correctional institutions. The data for this study come from the 2000 Census of State and Federal Adult Correctional Facilities. Data were collected from 84 federal correctional …

Analysis Of Multi-Platform Mobile Application Development, Courtney B. Thaden

Theses and Dissertations

The variety of mobile devices and their operating platforms has rapidly increased. With this increase come separate standards, programming languages, and distribution markets. Typically developers want to deliver their products to a variety of users encompassing various platforms; however choosing to develop using a native program for a platform can delay the development and release on another platform. Multi-platform development applications were created in order to deploy applications to various platforms in a more timely and cost efficient manner by using a single code base.

The purpose of this study was to investigate the multi-platform development applications MoSync, Appcelerator, and …

The (In)Visible Road Map: The Role Of Mentoring For First-Generation Black Female Doctoral Students At Predominantly White Institutions, Takea Vickers

LSU Doctoral Dissertations

Although women’s status in higher education has vastly improved over the past decades, invisible barriers remain that disenfranchise first-generation Black female doctoral students at predominantly White institutions (PWI). Specifically, the sparse literature base constricts existing knowledge and understanding about the mentoring relationships of first-generation Black female doctoral students and the barriers they face in the academy. Using the theoretical framework of intersectionality, this study sought to address the ways in which first-generation Black female doctoral students navigated the academy through mentorship and the ways in which mentoring relationships were formidable to construct. Five first-generational Black female doctoral students and two …

Examining The Boundary Conditions Between Cognitive Control And Interference Derived From Stimulus-Based And Response-Based Conflict, Jonathan D. Tall

LSU Doctoral Dissertations

Cognitive control is a broad construct that defines a set of processes involved in maintaining task goals in response to interference. Working memory capacity (WMC) is a similarly defined construct that shares many overlapping functions with cognitive control. The studies presented used controlled forms of interference to identify limits, or boundary conditions, that could help clarify the relationship between cognitive control and WMC. Experiment 1 used context effects to manipulate how interference and cognitive control could overlap. A spatial Stroop/Simon task was used in which proportion congruency for each subset (e.g., Simon or spatial Stroop) was manipulated to produce a …

Neighborhood Perceptions In The Near South Side Neighborhood Of Grand Forks, Nd, Mikel Elizabeth Smith

Theses and Dissertations

Older neighborhoods across the country are at risk of collapse. In response, city governments are taking a renewed interest in their older inner-city districts. Urban Neighborhood Initiatives (UNI) is one way local governments are renewing and revitalizing these neighborhoods. This is happening in Grand Forks, ND. Consequently, this study's focus is on the perceptions of residents in the Near South Side neighborhood (NSS).

Data was collected through a questionnaire survey. A total of 203 replies were received from the pool of 740 surveys distributed in the Mayors Urban Neighborhood Initiative and the attached historic district. The four research questions focused …

Reading Comprehension Assessment: A Comparison Of Academic And Clinical Measures, Emily Ann Stephens

Theses and Dissertations

The Measures of Academic Progress (MAP) test is a computer-based academic assessment of reading comprehension that is used by school districts nationwide. The MAP has established reliability, but its validity is not widely available. The purpose of this study was to seek validity for the MAP by comparing it to the Gray Oral Reading Test--5th edition (GORT-5), a frequently used and valid clinical test of reading comprehension. Participants included twenty-eight fourth grade students ranging from 9;7 to 10;8 years of age, with a mean of 10;2. Each participant completed the GORT-5 and MAP test. The GORT-5 and MAP each yield …

Mapping Techniques For Soil Erosion: Modeling Stream Power Index In Eastern North Dakota, Rick Thalacker

Theses and Dissertations

Soil erosion is a worldwide problem that can negatively affect surface water through the introduction of sediment, nutrients (eg. nitrogen, phosphorus), pesticides, and other chemicals. Soil erosion is often exacerbated by agricultural and other types of land use. The objective of this study was to identify gully locations in agricultural fields adjacent to the Turtle and Forest rivers in eastern North Dakota that accumulate surface flow resulting in areas of critical surface erosion in a GIS using the Stream Power Index (SPI). A field survey was conducted to verify the accuracy of the terrain analysis at identifying 391 gully and …

Determinants Of Gold Returns: An Austrian Perspective, Justin Nicholas Theriot

Theses and Dissertations

In this article, I offer a comprehensive analysis on the factors that influence the gold market in relation to returns to demonstrate that gold moves as a currency. I employed a wide range of macroeconomic and commodity variables to investigate the underlying movements in the gold market. The methodology followed four simple steps; 1) correlation tests, 2) vector autoregression model of two lags, 3) auto-regressive integrated moving average model and 4) generalized autoregressive conditional heoteroskedasticity. This methodology enabled me to

convey that gold moves more as a currency and not as an investment. The main findings of this paper provided …

Spectrum Sensing, Spectrum Monitoring, And Security In Cognitive Radios, Erfan Soltanmohammadi

LSU Doctoral Dissertations

Spectrum sensing is a key function of cognitive radios and is used to determine whether a primary user is present in the channel or not. In this dissertation, we formulate and solve the generalized likelihood ratio test (GLRT) for spectrum sensing when both primary user transmitter and the secondary user receiver are equipped with multiple antennas. We do not assume any prior information about the channel statistics or the primary user’s signal structure. Two cases are considered when the secondary user is aware of the energy of the noise and when it is not. The final test statistics derived from …

Study Of The Suit Inflation Effect On Crew Safety During Landing Using A Full-Pressure Iva Suit For New-Generation Reentry Space Vehicles, Suzuki Wataru

Theses and Dissertations

Recently, manned space capsules have been recognized as beneficial and reasonable human space vehicles again. The Dragon capsule already achieved several significant successes. The Orion capsule is going to be sent to a high-apogee orbit without crews for experimental purposes in September 2014. For such human-rated space capsules, the study of acceleration impacts against the human body during splashdown is essential to ensure the safety of crews. Moreover, it is also known that wearing a full pressure rescue suit significantly increases safety of a crew, compared to wearing a partial pressure suit. This is mainly because it enables the use …

Panic Development Mechanisms And Preventive Methods Analysis, Inga Wuerges

Theses and Dissertations

Panic Development (PD) is one of the most important areas of Human Factors research due to its debilitating effects during high stress operating conditions in extreme environments. High levels of anxiety and panic evoke incidents that are a real threat to mission success and may result in fatalities. A delicate balance of crew selection, training, and systems' design is critical for mission success and human survival.

This research investigates possible panic development profiles and methods for preventing panic through realistic training. This research focuses on realistic training scenarios during the intense military flying exercise Red-Flag Alaska at Eielson AFB, AK. …

Application And Prospect Of Orthogonal On-Off Keying As An Error Control Coding In Laser Communication, Tasbirun Nahian Upal

Theses and Dissertations

In this thesis work, a bandwidth efficient coded modulation technique has been proposed for LASER based communication. It offers reliable error correction and bandwidth optimization for free space connectivity. Laser communication has been emerging as a potential alternative of Radio Frequency (RF) communication for long-haul connectivity. It provides several advantages over RF systems. Some of specific advantages are its high speed data transfer, higher bandwidth, robust security, immunity to electromagnetic interference, lower implementation cost. However, as any other communication system, it requires an error control system that detects and corrects error in the data transmission. The proposed technique blends well …

The Structures, Mass Motions And Footpoints Of Solar Filaments, Aparna Venkataramanasastry

Theses and Dissertations

This thesis focuses on identifying the mechanism by which solar filaments acquire mass. Some of the speculations for how a filament gets its mass are 1) injection of mass from the chromosphere into the filament structure, and 2) condensation of mass from the corona into the region of the filament channel. Mass motion at the footpoints of the filaments is studied to detect mass entering and leaving the filament body. The magnetic properties of the footpoints of the filaments are also studied. Recommendations are drawn by comparing observational properties obtained in this study with the features used in some of …

The Combined Effects Of Copper Sulfate And Hypoxia Stress On The Swim Performance Of Bluegill Sunfish (Lepomis Macrochirus), Dustin D. Anderson

Theses and Dissertations

Copper (Cu) is a component of several aquatic pesticides often used to target noxious algae, but at high concentrations may elicit toxic effects on non-target organisms such as fish. The severity of Cu toxicity varies widely by fish species, Cu concentration, duration of exposure, and water quality. Hypoxia is a widely occurring aquatic stressor that is also a potential side effect of Cu application due to increased oxygen demand from algae decay. Because Cu and hypoxia stress may occur in concert, it is important to understand and quantify their combined effects. Critical swimming speed (Ucrit) tests are an efficient and …

Agricultural Drought Monitoring And Prediction Using Soil Moisture Deficit Index, Jiexia Wu

Theses and Dissertations

The purposes of this study are: 1) to evaluate the performance of an agricultural drought index, Soil Moisture Deficit Index (SMDI) at continental scale; 2) to develop an agricultural drought prediction method based on precipitation, evapotranspiration and terrestrial water storage.

This study applied multiple linear regression (MLR) with the inputs of precipitation from Parameter-elevation Regressions on Independent Slopes Model (PRISM), evapotranspiration from Moderate Resolution Imaging Spectroradiometer (MODIS) MOD 16 and terrestrial water storage (TWS) derived from the Gravity Recovery and Climate Experiment (GRACE) to predict soil moisture and SMDI. The inputs of the MLR model were chosen based on the …

Statistical Analysis Of The Effectiveness Of The 'You're Hired!' Program At Changing Students' Attitudes Towards Engineering, Kristin Michelle Brevik

Theses and Dissertations

With the growing need for qualified employees in STEM-based careers, it is critical to develop activities for middle and high school students to increase their awareness of opportunities in these areas. With proper design, increasing awareness of STEM-based careers in conjunction with overcoming current stereotypes can lead to a change in attitudes towards these various careers. As part of this research project I have developed `You're Hired!', a program providing middle and high school students a hands-on, authentic experience in various engineering roles while assessing the change in a student's attitude towards the engineering profession. Project design also incorporates an …

Minnesota Paraeducators' Perceptions Of The Barriers To Becoming Licensed Special Education Teachers, Joni Burris

Theses and Dissertations

Public schools across the country are facing a critical shortage of licensed special education teachers. For many reasons, paraeducators have been considered strong teacher candidates and have been recruited into the teaching profession intermittently for decades. Paraeducators who decide to obtain their teaching license often experience obstacles to this endeavor: money, time, family obligations, navigating the university system, and academics.

This research study examined and analyzed Minnesota paraeducators' perceptions of the barriers to obtaining their special education teaching license. It also assessed the perceptional differences between Minnesota paraeducators who have completed at least a bachelor's degree and those who have …

Restoration, Presence And Computer Use: How Computer Displays Incorporating Restorative Environments Effect Users' Sense Of Restoration And Presence, Jacob Bell

Theses and Dissertations

Recent technological advances provide opportunities for computer users to replace

desktop pictures with dynamic, audio-visual recordings. Such advances provide researchers with opportunities to better understand how specific video content may effect users' sense of restoration and presence. As described within Attention Restoration Theory, those perceiving restorative environments, which are found primarily within nature-based environments, experience a sense of restoration. Yet, prior research has largely focused on singular, and to an extent, non-interactive displays of restorative environments. The current research further investigated the restorative potential of environments having incorporated interactive, computer-based displays, with animated audio-visual environments. Participants were assigned to either …

Translation Of Aadl To Pnml To Ensure The Utilization Of Petri Nets, Amrita Chatterjee

Theses and Dissertations

Architecture Analysis and Design Language (AADL), which is used to design and analyze software and hardware architectures of embedded and real-time systems, has proven to be a very efficient way of expressing the non-functional properties of safety-critical systems and architectural modeling. Petri nets are the graphical and mathematical modeling tools used to describe and study information processing systems characterized as concurrent and distributed. As AADL lacks the formal semantics needed to show the functional properties of such systems, the objective of this research was to extend AADL to enable other Petri nets to be incorporated into Petri Net Markup Language …

Liminal Encounters And The Missionary Position: New England's Sexual Colonization Of The Hawaiian Islands, 1778-1840, Anatole Brown Ma

All Student Scholarship

This study on New England’s early contact with the Hawaiian Islands examines the sexual liminality of the initial encounter. Late eighteenth century navigators from Boston recorded what could be described as “intimate encounters” with Native Hawaiian women and men.

Visible-Light Photocatalyzed Cross-Linking Of Diacetylene Ligands By Quantum Dots To Improve Their Aqueous Colloidal Stability, Marion G. Götz, Hiroko Takeuchi, Matthew J. Goldfogel, Julia M. Warren, Brandon D. Fennel, Colin D. Heyes

Chemistry & Biochemistry Faculty Publications and Presentations

Ligand cross-linking is known to improve the colloidal stability of nanoparticles, particularly in aqueous solutions. However, most cross-linking is performed chemically, in which it is difficult to limit interparticle cross-linking, unless performed at low concentrations. Photochemical cross-linking is a promising approach but usually requires ultraviolet (UV) light to initiate. Using such high-energy photons can be harmful to systems in which the ligand–nanoparticle bond is fairly weak, as is the case for the commonly used semiconductor quantum dots (QDs). Here, we introduce a novel approach to cross-link thiolated ligands on QDs by utilizing the photocatalytic activity of QDs upon absorbing visible …

Star Formation And The Interstellar Medium In Nearby Tidal Streams (Saints): Spitzer Mid-Infrared Spectroscopy And Imaging Of Intergalactic Star-Forming Objects, Sarah J.U. Higdon, James L. Higdon, B. J. Smith, M. Hancock

Physics & Astronomy: Faculty Publications

A spectroscopic analysis of 10 intergalactic star-forming objects (ISFOs) and a photometric analysis of 67 ISFOs in a sample of 14 interacting systems is presented. The majority of the ISFOs have relative polycyclic aromatic hydrocarbon (PAH) band strengths similar to those of nearby spiral and starburst galaxies. In contrast to what is observed in blue compact dwarfs (BCDs) and local giant H ii regions in the Milky Way (NGC 3603) and the Magellanic Clouds (30 Doradus and N 66), the relative PAH band strengths in ISFOs correspond to models with a significant PAH ion fraction (3.7, i.e., enhanced non-stellar emission, …

Wiyot History Papers, Jerry Rohde

Wiyot History Papers

"The Wiyot History Papers are an astonishing and deeply moving set of documents. They contain the only known statements that were both given by and recorded by Indians, probably dictated in the Wiyot language in the early 1920s by several Wiyot elders and translated and transcribed by a younger Wiyot, Warren Brenard. The accounts give great insight into what actually happened to the Humboldt County Indians in the mid-19th century and are testimony to the courage and endurance of a people who for years were under merciless attack."--Introduction

Identification Of Plasma Lipid Biomarkers In Alzheimer's Disease, Rhona Creegan

Theses: Doctorates and Masters

Alzheimer’s disease (AD), the commonest form of dementia, is a chronic, progressive neurodegenerative disease which manifests clinically as a slow global decline in cognitive function, including deterioration of memory, reasoning, abstraction, language and emotional stability, culminating in a patient with end-stage disease, totally dependent on custodial care. With an ageing population, there is predicted to be a marked increase in the number of people diagnosed with AD in the coming decades, making this a significant challenge to socio-economic policy and aged care. Currently there is no cure for AD and while current therapies may temporarily ameliorate symptoms, death usually occurs …

Developing Effective Hospital Management Information Systems: A Technology Ecosystem Perspective, Christopher Bain

Theses: Doctorates and Masters

This thesis presents the results of the program of research performed in the completion of a Doctor of Philosophy (Business) entitled: Developing Effective Hospital Management Information Systems: A Technology Ecosystem Perspective.

The central contention of this thesis is that the current ecosystem models in the information technology (IT) and information systems (IS) literature can be extended and improved. In turn they can be better applied to the field of IS and the development and implementation of information systems. This research seeks to highlight an example of how these models can be extended, through an analysis of the specific context of …

Comparison Of The Shaping Abilities Of Three Nickel–Titanium Instrumentation Systems Using Micro-Computed Tomography, Jin Yi Baek, Hyun Mi Yoo, Dong Sung Park, Tae Seok Oh, Kee Yeon Kum, Seung Yun Shin, Seok Woo Chang

Journal of Dental Sciences

Abstract Background/purpose The purpose of this study was to compare the canal transportation (CTR) and centering ratio (CR) of ProFile (PF), Twisted File (TF), and WaveOne (WO) nickel-titanium instrument systems and evaluate canal volume (CV) and surface area (SA) using micro-computed tomography (CT). Materials and methods Eighteen extracted human mandibular molars with two separate mesial canals were selected. The specimens were randomly divided into three groups of six teeth. Therefore, twelve root canals were allocated for each group ( n = 12): group 1, PF(#30/.06); group 2, TF(#30/.06); group 3, WO (primary) instrument systems. Working lengths were determined 0.5 mm …

Elliott Carter And His Use Of Metric And Temporal Modulaton In His Eight Pieces For Four Timpani : An Examination Into The Application Of Click Tracks During The Preparation And Performance Of These Works, Tegan Lebrun

Theses : Honours

Elliott Carter’s Eight Pieces for Four Timpani have become integral works in the solo timpani repertoire. They continue to offer technical and musical challenges to both developing and professional players and have influenced the development of the solo timpani genre to date. These pieces contain metric and temporal modulation – musical processes which alter certain performance parameters concerning pulse and subdivision tempi.

This dissertation investigates Carter’s use of metric and temporal modulation in his Eight Pieces for Four Timpani and examines the effects click track application has on the performance of these works. A brief biography of Carter and his …

Intermediate Accounting Ii, William Hahn

Syllabus Repository

No abstract provided.