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Articles 14671 - 14700 of 19641
Full-Text Articles in Entire DC Network
Generation Y And Vocal Fry, Paul Michael Valley
Generation Y And Vocal Fry, Paul Michael Valley
Theses and Dissertations
In this thesis, the author explores a vocal phenomenon called “vocal fry” and why this dysphonia has emerged as one of the primary means of communication for the population referred to as “Generation Y.” The first chapter defines what vocal fry is and why it is of modest value to the stage actor. The second chapter defines the physiological means by which the human body creates sound, what good sound is and how vocal fry is created. The third and fourth chapters define several generations as well as what defines Gen Y, and the communication physiologies associated with those generations. …
A Verbal Snapshot Of Visual Scrutiny Primarily In The Sphere Of Art, Matthew Alverson
A Verbal Snapshot Of Visual Scrutiny Primarily In The Sphere Of Art, Matthew Alverson
Theses and Dissertations
Finding and extracting meaning from the world I encounter every day is the primary motivation behind my creativity. Filtering perception and separating the important bits of information by selection or elimination is the crux of this investigation. This process is one of finding rationale in futility and applying meaning to meaningless encounters. The significance of life is not fixed and it is our responsibility to make it up to best suit the desire to have purpose. Depending on the way something is looked at determines the meaning behind it. Anything can have content if it is seen and translated a …
The Prognostic Potential Of The Epidermal Growth Factor Receptor And Nuclear Factor Kappa B Pathways And Associated Therapeutic Strategies In Patients With Squamous Cell Carcinoma Of The Head And Neck, Pamela Wirth
Theses and Dissertations
Little is known about the signaling pathways that contribute to treatment response in advanced stage head and neck tumors. Increased expression of epidermal growth factor receptor (EGFR) and downstream pathways such as nuclear factor kappa B (NFκB) are implicated in aggressive tumor phenotypes and limited response to therapy. This study explored the rationale for combining the proteasome inhibitor bortezomib with the EGFR inhibitor gefitinib in a subset of head and neck squamous cell carcinomas with high EGFR gene amplification. Drug responses of gefitinib and bortezomib as single agents and in combination within head and neck squamous cell carcinoma cell lines …
Relationship Between Green School Design And Student Achievement, Attendance, And Student Behaviors, Deborah Lynn Bruick
Relationship Between Green School Design And Student Achievement, Attendance, And Student Behaviors, Deborah Lynn Bruick
Theses and Dissertations
Literature is replete with the harmful effects of poorly maintained facilities on building occupants. School district officials are charged with constructing schools of quality while also serving as conscientious stewards of public monies, therefore, school leaders need facility research to support decision-making. The purpose of the study was to examine the impact that schools constructed following Leadership in Energy and Environmental Design (LEED) certification standards have on student achievement, student attendance, and teacher's perceptions compared to non-LEED schools. The analysis revealed no significant difference for academic achievement or attendance but revealed a statistically significant difference between LEED and non-LEED teachers …
Studies On Inositol Polyphosphates And Their Role In Programmed Cell Death, Rakhee Agarwal
Studies On Inositol Polyphosphates And Their Role In Programmed Cell Death, Rakhee Agarwal
Theses and Dissertations
The agents that induce apoptosis in cancerous cells are considered as potential candidates for cancer therapy. Inositol polyphosphates, the naturally occurring compounds, regulate diverse cellular processes including induction of apoptosis in certain cancerous cells and hence can be considered as potential anticancer agents. The aim of this research dissertation was to establish firmly the role of inositol polyphosphates in induction of apoptosis by examining their mechanism of action. The overall hypothesis was that alterations in intracellular levels of inositol polyphosphates would bring about apoptotic changes. The hypothesis was tested by changing endogenous inositol polyphosphates by way of chemical treatments known …
Influence Of Soil Water Repellency On Post-Fire Revegetation Success And Management Techniques To Improve Establishment Of Desired Species, Matthew D. Madsen
Influence Of Soil Water Repellency On Post-Fire Revegetation Success And Management Techniques To Improve Establishment Of Desired Species, Matthew D. Madsen
Theses and Dissertations
The influence of soil water repellency (WR) on vegetation recovery after a fire is poorly understood. This dissertation presents strategies to broaden opportunities for enhanced post-fire rangeland restoration and monitoring of burned piñon and juniper (P-J) woodlands by: 1) mapping the extent and severity of critical and subcritical WR, 2) determining the influence of WR on soil ecohydrologic properties and revegetation success, and 3) evaluating the suitability of a wetting agent composed of alkylpolyglycoside-ethylene oxide/propylene oxide block copolymers as a post-fire restoration tool for ameliorating the effects of soil WR and increasing seedling establishment. Results indicate that:
• Post-fire patterns …
Carbon Coated Tellurium For Optical Data Storage, Jonathan D. Abbott
Carbon Coated Tellurium For Optical Data Storage, Jonathan D. Abbott
Theses and Dissertations
A highly durable optical disk has been developed for data archiving. This optical disk uses tellurium as the write layer and carbon as a dielectric and oxidation prevention layer. The sandwich style CTeC film was deposited on polycarbonate and silicon substrates by plasma sputtering. These films were then characterized with SEM, TEM, EELS, ellipsometry, ToF-SIMS, etc, and were tested for writability and longevity. Results show the films were uniform in physical structure, are stable, and able to form permanent pits. Data was written to a disk and successfully read back in a commercial DVD drive.
Inferring Dispersal Of Aquatic Invertebrates From Genetic Variation: A Comparative Study Of An Amphipod (Talitridae Hyalella Azteca) And Mayfly (Baetidae Callibaetis Americanus) In Great Basin Springs, Heather Lynn Stutz
Theses and Dissertations
Whether active or passive, dispersal accompanied by gene flow shapes the population genetics and evolutionary divergence of species. Indirect methods which use genetic markers have the ability to assess effective dispersal—that which resulted in gene flow. My objective was to see if an aquatic insect and an obligate aquatic invertebrate show similar phylogeographic patterns and genetic uniqueness. Hyalella azteca and Callibaetis americanus were collected from 4-5 springs in each of six basins in the Great Basin of western North America. No dispersal or genetic studies of C. americanus have been conducted to date. However, several studies focusing on mtDNA diversity …
Development Of A Methodology For Numerical Simulation Of A D C Arc Discharge In A Liquid Dielectric, Christopher James Lewis
Development Of A Methodology For Numerical Simulation Of A D C Arc Discharge In A Liquid Dielectric, Christopher James Lewis
Theses and Dissertations
The majority of literature regarding the numerical simulation of arc discharges in gaseous environments has used a plasma physics approach. Virtually all simulations treat the discharge as an idealized gaseous plasma, which can be described by temperature, pressure, and electric field. This approach can work well if the media is a shielding gas such as Argon; however, the approach does not work well for processes such as underwater welding, EDM, and underwater discharges used to generate high purity particles. The reason these discharges do not have many extensive simulation efforts as described in the literature is because they occur in …
Acoustic Mediation Of Vocalized Emotion Identification: Do Decoders Identify Emotions Idiographically Or Nomothetically?, Michael Kenneth Lauritzen
Acoustic Mediation Of Vocalized Emotion Identification: Do Decoders Identify Emotions Idiographically Or Nomothetically?, Michael Kenneth Lauritzen
Theses and Dissertations
Most research investigating vocal expressions of emotion has focused on one or more of three questions: whether there exist unique acoustic profiles of individual encoded emotions, whether the nature of emotion expression is universal across cultures, and how accurately decoders can identify expressed emotions. This dissertation begins to answer a fourth question, whether there exist unique patterns in the types of acoustic properties persons focus on to identify vocalized emotions. Three hypotheses were tested: first, whether acoustic patterns are interpreted idiographically or nomothetically as reflected in a comparison of individual vs. group lens model identification ratios; second, whether there exists …
Computational Modeling Of Biochemical Systems Using Cellular Automata, Advait Apte
Computational Modeling Of Biochemical Systems Using Cellular Automata, Advait Apte
Theses and Dissertations
Biological systems exhibit complex behaviors through coordinated responses of individual biological components. With the advent of genome-scale techniques, one focus has been to develop methods to model interactions between components to accurately describe intact system function. Mathematical modeling techniques such as constraint-based modeling, agent-based modeling, cellular automata (CA) modeling and differential equation modeling are employed as computational tools to study biological phenomenon. We have shown that cellular automata simulations can be used as a computational tool for 12 predicting the dynamics of biological systems with stochastic behavior. The basic premise for the research was the observations made during a study …
Comparison Of Single-Use And Multiple-Use Electrodes For Sensory, Motor Threshold Amplitudes And Force Production, Lucia Maloy
Comparison Of Single-Use And Multiple-Use Electrodes For Sensory, Motor Threshold Amplitudes And Force Production, Lucia Maloy
Theses and Dissertations
Context: Electrodes play an important role in interfacing tissue with electrical stimulation devices. Manufacturers recommend that adhesive metallic mesh cloth electrodes be used no more than 10 times before they are discarded, however, clinically the electrodes are often used up to 30 times. Another concern is sanitation. When electrodes are used on different patients, there is a chance for cross-contamination and bacterial growth on the electrode. Objective: To compare amplitudes of perceived sensation, motor twitch and force produced at specific amplitudes using single-use electrodes that run no risk of cross-contamination, and multiple-use electrodes. Design: Mixed model ANOVA with the subject …
Decision-Based Data Fusion Of Complementary Features For The Early Diagnosis Of Alzheimer's Disease, Metin Ahiskali
Decision-Based Data Fusion Of Complementary Features For The Early Diagnosis Of Alzheimer's Disease, Metin Ahiskali
Theses and Dissertations
As the average life expectancy increases, particularly in developing countries, the prevalence of Alzheimer's disease (AD), which is the most common form of dementia worldwide, has increased dramatically. As there is no cure to stop or reverse the effects of AD, the early diagnosis and detection is of utmost concern. Recent pharmacological advances have shown the ability to slow the progression of AD; however, the efficacy of these treatments is dependent on the ability to detect the disease at the earliest stage possible. Many patients are limited to small community clinics, by geographic and/or financial constraints. Making diagnosis possible at …
Progress Toward The Total Synthesis Of Lyconadin A, Yu Zhang
Progress Toward The Total Synthesis Of Lyconadin A, Yu Zhang
Theses and Dissertations
Lyconadin A is a pentacyclic Lycopodium alkaloid isolated from the club moss Lycopodium complanatum with antitumor properties. We have developed a novel 7-exo/6-exo acyl radical cascade cyclization as a method of making the bicyclo[5.4.0]undecane ring system of lyconadin A. The model products are trans-fused ring systems, while a cis-fused ring system is needed in lyconadin A. We have discovered a method to convert the trans-fused model cascade cyclization product into the desired cis isomer. Based on Donohoe's pyridone synthesis, we developed a method for the construction of 5-alkyl and 3,5-dialkyl-6-carbomethoxy-2-pyridones, the former of which …
The Association Between Lead Exposure And Respiratory Health In Children, Colleen Coleman
The Association Between Lead Exposure And Respiratory Health In Children, Colleen Coleman
Theses and Dissertations
Purpose: The substantial impact of indoor air quality and environmental hazards in the home on one’s health has long been recognized in the field of public health. This cross-sectional study investigates the risk between home based hazards, specifically lead, and respiratory health in children. The objective of this study is to examine the extent to which children testing positive for blood lead exposure are at an increased risk for having poor respiratory health. Methods: A nationally representative sample of 977 children ages 1- 6 years was obtained from the 2005-2006 National Health and Nutrition Examination Survey (NHANES). Information from the …
Modeling Of The Biomass Power Generation And Techno-Economic Analysis, Shireesha Methuku
Modeling Of The Biomass Power Generation And Techno-Economic Analysis, Shireesha Methuku
Theses and Dissertations
Biomass is one of the renewable energy sources being used widely for power generation. This research work includes developing a comprehensive model for a biomass based power generation system as well as analyzing the technical, economical, and environmental impacts. The research objectives include modeling of the system, stability studies, and sensitivity analysis using MATLAB/Simulink. A mathematical model for the gas turbine has been developed and successfully interconnected with the distribution network. Transient stability of the power system has been carried out for four bus and six bus test case systems. Maximum rotor speed deviation, oscillation duration, rotor angle, and mechanical …
A Method For Integrating Heterogeneous Datasets Based On Go Term Similarity, Chamali Lankara Thanthiriwatte
A Method For Integrating Heterogeneous Datasets Based On Go Term Similarity, Chamali Lankara Thanthiriwatte
Theses and Dissertations
This thesis presents a method for integrating heterogeneous gene/protein datasets at the functional level based on Gene Ontology term similarity. Often biologists want to integrate heterogeneous data sets obtain from different biological samples. A major challenge in this process is how to link the heterogeneous datasets. Currently, the most common approach is to link them through common reference database identifiers which tend to result in small number of matching identifiers. This is due to lack of standard accession schemes. Due to this problem, biologists may not recognize the underlying biological phenomena revealed by a combination of the data but by …
Incentives For Poultry Integrators To Contract Bio-Secure Producers And Implication For Government Indemnification Program, Yichen Zhang
Incentives For Poultry Integrators To Contract Bio-Secure Producers And Implication For Government Indemnification Program, Yichen Zhang
Theses and Dissertations
These recent events of H1N1 flu outbreak illustrate the potential ramifications of infectious diseases on modern society and how society responds to these threats. This thesis addresses the specific case of avian influenza in U.S. poultry production. By building an expected utility maximization model for integrators contracting with growers of varying bio-secure levels, one can investigate the relationship between the bio-secure choice of the poultry industry and their production performance. The model is empiricized using the Phoon, Quek, and Huang (PQH) simulation technique to conduct numerical analysis. The model selects the optimal percentage of bio-secure farms for the integrators to …
Biogeochemistry Of Microbial Mats From A Hypersaline Pond And Reef Biofilm From A Modern Coral Reef, The Bahamas, Mary Keith Puckett
Biogeochemistry Of Microbial Mats From A Hypersaline Pond And Reef Biofilm From A Modern Coral Reef, The Bahamas, Mary Keith Puckett
Theses and Dissertations
Biofilm communities host complex biogeochemical processes and play a role in the formation of many carbonate rocks by influencing both carbonate precipitation and dissolution. In this study, the biogeochemistry of microbial mats from a hypersaline pond and biofilm from a coral reef are described using SEM, microelectrode profiling, Biolog, fatty acid methyl ester (FAME) and carbon nitrogen analysis. Results show that the microbial mats are distinctly layered, having an oxic upper portion and an H2S-rich lower portion. The most significant conclusions are that the mats have exceptionally high TOC values and display significant differences in microbial communities present, both between …
Waterfowl Foods And Use In Managed Grain Sorghum And Other Habitats In The Mississippi Alluvial Valley, Alicia Joy Wiseman
Waterfowl Foods And Use In Managed Grain Sorghum And Other Habitats In The Mississippi Alluvial Valley, Alicia Joy Wiseman
Theses and Dissertations
Grain sorghum provides energy-rich seeds for waterfowl. I conducted experiments in 22 sorghum fields in Arkansas, Mississippi, and Louisiana during falls 2006 – 2007 to evaluate abundance of ratoon grain (i.e., second crop after harvest), waste grain, and natural seeds. I also conducted surveys of wintering waterfowl in flooded croplands and moist-soil wetlands to evaluate if ducks and geese differentially used habitats. Fertilized plots in 2007 produced >4 times more ratoon grain (x = 219.57 ± 39.65 [SE] kg/ha) than other treatments. Fertilized plots in southern regions of my study area produced ~5 times more ratoon grain (x = 262.93 …
A Descriptive Study Of Intercollegiate Athletics In Mississippi's Public Community And Junior Colleges, Brian Colson Alexander
A Descriptive Study Of Intercollegiate Athletics In Mississippi's Public Community And Junior Colleges, Brian Colson Alexander
Theses and Dissertations
The purpose of the study was to provide an assessment of the involvement of Mississippi's community and junior colleges in intercollegiate athletics during the academic year 2007–2008. These data could assist community and junior college presidents, vice presidents residing over athletics, athletic directors, and other policy makers in their decision-making processes concerning intercollegiate athletics. They could compare their institution with other institutions in the state. This study included the entire population of Mississippi's public community and junior colleges that offered intercollegiate athletics. Frequencies and percentages were utilized by the researcher to report the information. Data were collected to provide an …
Osteogenic Regulatory Mechanisms Activated By Pressure In Aortic Heart Valve, Carol Andrea Pregonero Gamez
Osteogenic Regulatory Mechanisms Activated By Pressure In Aortic Heart Valve, Carol Andrea Pregonero Gamez
Theses and Dissertations
Calcific aortic valve disease (CAVD) is the most common cause of aortic valve failure and replacement in the elderly population, affecting 25% of the population over 65 years of age. Current pharmacological approaches for preventing the onset and progression of calcific aortic valve disease have not shown consistent benefits in clinical studies. Differentiation of valvular interstitial cells (VICs) into osteoblast–like cells is an integral step in the calcification process. Although clinical evidence suggests hypertension as a potential candidate contributing to the development of CAVD, the underlying molecular mechanisms that cause de-differentiation remain unclear. The present study investigates the role of …
Implantable Antennas For Wireless Data Telemetry: Design, Simulation, And Measurement Techniques, Tutku Karacolak
Implantable Antennas For Wireless Data Telemetry: Design, Simulation, And Measurement Techniques, Tutku Karacolak
Theses and Dissertations
Recent advances in electrical engineering have let the realization of small size electrical systems for in-body applications. Today’s hybrid implantable systems combine radio frequency and biosensor technologies. The biosensors are intended for wireless medical monitoring of the physiological parameters such as glucose, pressure, temperature etc. Enabling wireless communication with these biosensors is vital to allow continuous monitoring of the patients over a distance via radio frequency (RF) technology. Because the implantable antennas provide communication between the implanted device and the external environment, their efficient design is vital for overall system reliability. However, antenna design for implantable RF systems is a …
Verification Of A Three-Dimensional Statics Model For Continuum Robotics And The Design And Construction Of A Small Continuum Robot (Scr), Ricky (Ricky Lee) Gray
Verification Of A Three-Dimensional Statics Model For Continuum Robotics And The Design And Construction Of A Small Continuum Robot (Scr), Ricky (Ricky Lee) Gray
Theses and Dissertations
Continuum robots are biologically inspired robots that capture the extraordinary abilities of biological structures such as elephant trunks, octopus tentacles, and mamma-lian tongues. They are given the term continuum robots due to their ability to bend conti-nuously rather than at specific joints such as with traditional rigid link robots. They are used in applications such as search and rescue operations, nuclear reactor repairs, colo-noscopies, minimal invasive surgeries, and steerable needles. In this thesis, a model that predicts the shape of a continuum robot is presented and verified. A verification system to verify the validity and accuracy of the model is …
Analysis Of Electromagnetic And Seismic Geophysical Methods For Investigating Shallow Sub-Surface Hydrogeology, Eric M. Parks
Analysis Of Electromagnetic And Seismic Geophysical Methods For Investigating Shallow Sub-Surface Hydrogeology, Eric M. Parks
Theses and Dissertations
An integrated electromagnetic (EM) and seismic geophysical study was performed to evaluate non-invasive approaches to estimate depth to shallow groundwater in arid environments with elevated soil salinity where the installation of piezometers would be impractical or prohibited. Both methods were tested in two study areas (semi-arid and arid respectively), one in Palmyra, Utah, USA near the shore of Utah Lake where groundwater is shallow and unconfined in relatively homogeneous lacustrine sediments. The other area is Carson Slough, Nevada, USA near Ash Meadows National Wildlife Refuge in Amargosa Valley. The area is underlain by valley fill, with generally variable shallow depths …
The Ecological Importance Of Extrinsic And Intrinsic Drivers Of Animal Movement, Josh Earl Rasmussen
The Ecological Importance Of Extrinsic And Intrinsic Drivers Of Animal Movement, Josh Earl Rasmussen
Theses and Dissertations
The movement of individuals is foundational to many ecological processes. For example, the movement of an organism from one place to another alters population density at both sites and has potential for affecting the genetic dynamics within the new population. Individual movement events may be in synchrony with overall trends in populations, e.g. spawning migrations, or may be atypical (asynchronous). This latter movement type can affect population and metapopulation dynamics, depending on its prevalence within a population. Nevertheless, given the complexity of interactions, the causative factors of movement are understood vaguely, much less for aquatic organisms. Drivers of movement are …
Analysis Of Regulatory T Cell Activation Markers In Feline Immunodeficiency Virus (Fiv)-Infected And Control Placenta Samples From Early And Late Term Pregnancy, Nikki Nikkia Lockett
Analysis Of Regulatory T Cell Activation Markers In Feline Immunodeficiency Virus (Fiv)-Infected And Control Placenta Samples From Early And Late Term Pregnancy, Nikki Nikkia Lockett
Theses and Dissertations
Mother-to-child transmission of HIV is the leading cause of pediatric AIDS; however, mechanisms by which HIV compromises pregnancy are not understood. CD4+CD25+ T-regulatory (Treg) cells play a role in pregnancy maintenance. RNA from early and late gestation placentas and fetuses from FIV-infected and control cats were probed for expression of FIV gag and Treg markers CD25, FOXP3, and CTLA4, using real time reverse-transcriptase (RT)-PCR. High rates of vertical transmission and reproductive failure were detected in early and late pregnancy. In control animals, both FOXP3 and CTLA4 expression decreased with gestational stage, indicating a natural decline in Tregs. Expression of FOXP3 …
Investigation Of The Mechanical Properties Of Poly (Ethylene Glycol) Diacrylate By Nanoindentation Using Atomic Force Microscopy, Zouheir Drira
Investigation Of The Mechanical Properties Of Poly (Ethylene Glycol) Diacrylate By Nanoindentation Using Atomic Force Microscopy, Zouheir Drira
Theses and Dissertations
Poly (ethylene glycol) (PEG) hydrogel based polymers are among the most widely used synthetic materials for biomedical applications. Because of their biocompatibility, and ease of fabrication, hydrogels are highly suitable for use as constructs to engineer tissues as well as for cell transplantation. A critical parameter of importance for PEG hydrogels is their mechanical properties which are highly dependent on the environmental conditions. Properties of PEG-based hydrogels can be engineered to resemble scaffolds composed of extracellular matrix molecules, which provide structural support, adhesive sites and mechanical as well as biomechanical signals to most cells. The mechanical properties of these synthetic …
Incorporating Multiresolution Analysis With Multiclassifiers And Decision Fusion For Hyperspectral Remote Sensing, Terrance Roshad West
Incorporating Multiresolution Analysis With Multiclassifiers And Decision Fusion For Hyperspectral Remote Sensing, Terrance Roshad West
Theses and Dissertations
The ongoing development and increased affordability of hyperspectral sensors are increasing their utilization in a variety of applications, such as agricultural monitoring and decision making. Hyperspectral Automated Target Recognition (ATR) systems typically rely heavily on dimensionality reduction methods, and particularly intelligent reduction methods referred to as feature extraction techniques. This dissertation reports on the development, implementation, and testing of new hyperspectral analysis techniques for ATR systems, including their use in agricultural applications where ground truthed observations available for training the ATR system are typically very limited. This dissertation reports the design of effective methods for grouping and down-selecting Discrete Wavelet …
Detection Of Tick-Borne Bacterial Agents In Lone Star Ticks (Amblyomma Americanum) And Various Wildlife In Mississippi, Ashley Harris Castellaw
Detection Of Tick-Borne Bacterial Agents In Lone Star Ticks (Amblyomma Americanum) And Various Wildlife In Mississippi, Ashley Harris Castellaw
Theses and Dissertations
Two studies were conducted to evaluate the presence of tick-borne bacterial agents in Amblyomma americanum, lone star tick (LST), and various wildlife in Mississippi. Adult LSTs had DNA evidence of Ehrlichia chaffeensis (3.7%), E. ewingii (6.3%), and Borrelia lonestari (2.6%), while both larval (24.3%) and adult (43.5%) LSTs were positive for a Rickettsia spp. by polymerase chain reaction (PCR). White-tailed deer (WTD) were the only wildlife PCR positive for E. chaffeensis (18.8%), B. lonestari (3.1%), and Anaplasma phagocytophilum (3.1%). In addition, WTD had the highest seroprevalence to B. lonestari (19.3%) and E. chaffeensis (43.9%) antigens while raccoons had the highest …