Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

2009

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 5341 - 5370 of 95731

Full-Text Articles in Entire DC Network

The Development Of A Mechatronics And Material Handling Course: Laboratory Experiments And Projects, James Shirley Dec 2009

The Development Of A Mechatronics And Material Handling Course: Laboratory Experiments And Projects, James Shirley

All Theses

Mechatronic systems integrate technologies from a variety of engineering disciplines to create solutions to challenging industrial problems. The material handling industry utilizes mechatronics to move, track, and manipulate items in factories and distribution centers. Material handling systems, because of their use of programmable logic controllers (PLC), PLC networks, industrial robotics, and other mechatronic elements, are a natural choice for a college instructional environment. This thesis offers insight and guidance for mechatronic activities introduced in a laboratory setting. A series of eight laboratory experiments have been created to introduce PLCs, robotics, electric circuits, and data acquisition fundamentals. In-depth case studies synthesize …

Go to article

A Genetic Approach To Voltage Collapse Mitigation, Dwarakesh Nallan Chakravartula Dec 2009

A Genetic Approach To Voltage Collapse Mitigation, Dwarakesh Nallan Chakravartula

All Theses

The objective of this thesis is to provide an efficient and accurate corrective solution to a system that is on verge of voltage collapse. This thesis describes, in detail, the development of an optimization scheme that aims to alleviate power system instability and voltage collapse condition based on the principles of an evolutionary approach called Genetic Algorithm. The state of a system is determined using a voltage stability identifier termed Collapse Proximity Index (CPI) and the critical loading condition is identified. Applying principles of Genetic Algorithm, the critical system is brought back to a stable operating region. The sequential procedure …

Go to article

Green Can Bring Green: An Evaluation And Comparison Of The Economic Effects Of Sustainable And Economic Redevelopment, Kathryn Young Dec 2009

Green Can Bring Green: An Evaluation And Comparison Of The Economic Effects Of Sustainable And Economic Redevelopment, Kathryn Young

All Theses

The process of redevelopment is a relied upon method of breathing new life into downtowns and urban areas. Though several common redevelopment approaches contribute to a sustainable atmosphere, more significant environmentally- and ecologically- sustainable approaches can be implemented in redevelopments to repair and support the environment and ecology of an area. But do economic and sustainable redevelopment models have similar impacts on the surrounding economies? This report conducted an evaluation and comparison of the economic effects of sustainable redevelopments and economic redevelopments. Though research is considered exploratory, the results demonstrate that sustainable and economic redevelopments are both viable options for …

Go to article

Gold Nanoparticle Interactions And Impact Upon A Common Biofilm Source: Legionella Pneumophila , Amber Stojak Dec 2009

Gold Nanoparticle Interactions And Impact Upon A Common Biofilm Source: Legionella Pneumophila , Amber Stojak

All Theses

There exists widespread concern of pathogenic bacteria colonizing and establishing biofilms in water systems providing a direct exposure route to the public. Legionella are widely distributed in human-made and natural environments, and colonization lends the potential to infect human hosts that may lead to the development of Legionnaire's Disease. Silver has been used in cooling towers and water filtration systems for removal of planktonic bacteria and biofilms; however permanent removal of L. pneumophila biofilms with metal ions is impossible when established biofilms are in hard to access places such as dead end piping or inside a protozoan host. Bulk metals …

Go to article

The Bite Detector: A Device For The Behavioral Treatment Of Overweight And Obesity, Jenna Scisco Dec 2009

The Bite Detector: A Device For The Behavioral Treatment Of Overweight And Obesity, Jenna Scisco

All Theses

Overweight and obesity are primary health concerns worldwide and particularly in the United States. Currently, the most effective treatments are behavioral interventions, and a reduction of eating rate is one behavioral method that may help individuals eat less and lose weight. Additionally, adaptive eating behaviors, such as intuitive eating, have been identified as healthy body weight predictors. The purpose of Study 1 was to examine the accuracy of the bite detector, a wrist-worn device designed to detect bites of food. Participants (N = 21) ate a meal in the laboratory, and the sensitivity and positive predictive value (PPV) of the …

Go to article

Reading Between The Lines: Reactions To Gendered Managerial Communications, Melissa Waitsman Dec 2009

Reading Between The Lines: Reactions To Gendered Managerial Communications, Melissa Waitsman

All Theses

Some of the earliest research on women in the workplace demonstrated that women are not perceived as competent leaders and managers. Several decades have passed since that time, but, on average, American women still earn less than their male counterparts, and women still occupy only 12 Chief Executive Officer positions in Fortune 500 companies, up from 2 in 2007 (Fortune, 2008). Recent research suggests that negative stereotypes about women's managerial competence persist, particularly in regards to their assertiveness and forcefulness, two core managerial characteristics.
Current research on gender differences indicates that females are significantly more concerned with social relationships in …

Go to article

Identifying And Comparing Key Process Attributes For Sustainable Building Delivery In India And The U.S., Prashanth Palanisamy Dec 2009

Identifying And Comparing Key Process Attributes For Sustainable Building Delivery In India And The U.S., Prashanth Palanisamy

All Theses

India is a rapidly developing nation with the associated brisk pace of construction. More sustainable building practices for construction in India would have social, environmental, and economic benefits. However, the key process attributes for successfully planning, designing, and constructing sustainable buildings in India are largely undefined. Other projects in India would benefit from a rigorous identification of these key process attributes which could help leapfrogging the sustainable building delivery in India to the best available practices.
Sustainable buildings require different delivery processes than traditional buildings; this can lead to process wastes due to unfamiliarity or incompatibility of the processes. These …

Go to article

2-D And 3-D Assessment Of Cambered And Symmetric Airfoils: A Cfd Study, Tuncay Kamas Dec 2009

2-D And 3-D Assessment Of Cambered And Symmetric Airfoils: A Cfd Study, Tuncay Kamas

All Theses

A two dimensional and three dimensional computational study has been carried out respectively regarding aerodynamic forces affecting a symmetric airfoil, NACA0015 and a cambered airfoil, NACA2414. The negative lift (down force) and drag forces were predicted through the simulation of airflows over inverted rear-wings in different configurations namely; varying incidences i.e. angles of attack of the airfoils, two dimensional cross section of the inverted rear wings to be mounted on back of a car, and varying speeds of initial airflow.
The downforce increases as the angle of attack increases however, if an inverted rear wing is fixed on a car …

Go to article

Effect Of Oscillating And Static Retort Thermal Processing Technology Using An Institutional Size Pouch, Judith Trevino Dec 2009

Effect Of Oscillating And Static Retort Thermal Processing Technology Using An Institutional Size Pouch, Judith Trevino

All Theses

The effects of oscillating and static retort thermal processing on heat penetration using an institutional size pouch were evaluated. A literature review of general information on retort thermal processing, process modes, processing mediums, retort pouches and starch was presented.
Frigex-W starch (National Starch Food Innovation) and water mixtures were prepared at three different concentrations (1%, 3% and 5%). Five replications of starch and water mixtures were processed using water spray as the processing medium in institutional size retort pouches (29.2 cm. x 38.1 cm.) using both oscillating and static processing modes.
Viscosity (by Brookfield viscometer and Bostwick consistometer), residual air …

Go to article

Recollection/Re-Collection: A Re-Positioning Of Artificial Nature In The Natural World, Martha Epp-Carter Dec 2009

Recollection/Re-Collection: A Re-Positioning Of Artificial Nature In The Natural World, Martha Epp-Carter

All Theses

ABSTRACT
In this body of work I explore the division between our experiences with nature in a controlled environment versus the less frequent experience of true nature. I concern myself with the distance we create for ourselves by diminishing our interactions with nature, making them convenient, not messy or intrusive. I also attempt to resensitize the viewer to his or her own conscious or unconscious response to nature. By setting up situations that utilize both real and artificial objects, images and materials, I place the viewer in a relationship with the work that requires thoughtful attention.
Through the creation of …

Go to article

Neomycin Enhances Glutaraldehyde Crosslinking And Glycosaminoglycan Stability In Bioprosthetic Heart Valves, Vincent Friebe Dec 2009

Neomycin Enhances Glutaraldehyde Crosslinking And Glycosaminoglycan Stability In Bioprosthetic Heart Valves, Vincent Friebe

All Theses

The native heart valve will open and close an astonishing 3 billion times in the average lifetime, implicating immense biomechanical ramifications that necessitate near-flawless structure and functional behavior. Deviations from this idyllic function as a result of heart valve disease (HVD) affect millions of individuals worldwide and result in over 275,000 heart valve replacements worldwide every year. Glutaraldehyde (GLUT) cross-linked porcine aortic heart valves, a common type of bioprosthetic heart valve (BHV), are used frequently in these valve replacement surgeries. The native valve leaflets entail a tri-composite design of type I collagen, elastin and glycosaminoglycans (GAGs), each of which are …

Go to article

Principal Component Thermography For Steady Thermal Perturbation Scenarios, Rohit Parvataneni Dec 2009

Principal Component Thermography For Steady Thermal Perturbation Scenarios, Rohit Parvataneni

All Theses

The work focuses on the qualitative enhancement of Thermographic Inspection data using Principal Component Analysis technique. A new processing tool named Economical Singular Value Decomposition (SVD) is proposed for analyzing the infrared image sequences acquired from the test specimen.
Experiments are carried out on test sample using thermal excitation modalities such as flash, halogen and induction to create temperature variations. The infrared (IR) image sequence containing the information about the sample is captured using IR cameras. The acquired IR image sequences are processed using the proposed Economical SVD which projects the matrix of raw pixel values of image sequence into …

Go to article

Experimental Characterization Of Stress Relaxation In Glass, Hemanth Kadali Dec 2009

Experimental Characterization Of Stress Relaxation In Glass, Hemanth Kadali

All Theses

Glass viscoelasticity has gained importance in recent years as glass lens molding appeared as a valuable alternative to the traditional grinding and polishing process for manufacturing glass lenses. In the precision lens molding process, knowledge of viscoelastic properties of glass in the transition region, which affect the stress relaxation behavior, is required to precisely predict the final size and shape of molded lenses. The purpose of this study is to establish a step-by-step procedure for characterizing the viscoelastic behavior of glass in the glass transition region using a finite term Prony series of a Generalized Maxwell model. This study focuses …

Go to article

The Effect Of Moderate Exercise On Folliculogenesis, Cortisol, Estradiol And Luteinizing Hormone In Mares, Dale Kelley Dec 2009

The Effect Of Moderate Exercise On Folliculogenesis, Cortisol, Estradiol And Luteinizing Hormone In Mares, Dale Kelley

All Theses

Assisted reproductive technologies allow mares to remain in training and produce offspring; however, limited data regarding the impact of exercise on folliculogenesis exists. Mares in training are reported to have reduced embryo recovery rates and ovulated smaller follicles. The objectives of this study are to evaluate the effect of exercise on folliculogenesis using ultrasound technology. Additionally, cortisol, luteinizing hormone (LH), follicle stimulating hormone (FSH) and estradiol concentrations in mares were evaluated. The exercise period was from April to September 2008 at Latitude: 34¡ 41' 1' N. Thirteen horses were assigned to Exercise (n=6) or Control group (n=7). Mares were exercised …

Go to article

Light Beaming From A Single Subwavelength Metal Slit, Pengyu Chen Dec 2009

Light Beaming From A Single Subwavelength Metal Slit, Pengyu Chen

All Theses

In this thesis, light transmission through a single sub-wavelength slit in a silver thin film with periodic gratings at the exit side of the slit has been studied in both the visible and mid-infrared wavelength ranges.
In the visible wavelength range, we first investigate the enhancement of plasmonic light beaming efficiency by near field resonance in a subwavelength metallic slit-groove beaming structure. We show that by varying the film thickness and the separation distance of the beaming grating, the intensity of the near field can be greatly enhanced by resonance, which leads to the increase of the beaming efficiency. Moreover, …

Go to article

Comparing Problem-Based Learning And Lecture As Methods To Teach Whole-Systems Design To Engineering Students, Michael Dukes Dec 2009

Comparing Problem-Based Learning And Lecture As Methods To Teach Whole-Systems Design To Engineering Students, Michael Dukes

All Theses

The objective of this research is to compare problem-based learning and lecture as methods to teach whole-systems design to engineering students. A case study, Appendix A, exemplifying successful whole-systems design was developed and written by the author in partnership with the Rocky Mountain Institute. Concepts to be tested were then determined, and a questionnaire was developed to test students' preconceptions. A control group of students was taught using traditional lecture methods, and a sample group of students was taught using problem-based learning methods. After several weeks, the students were given the same questionnaire as prior to the instruction, and the …

Go to article

Position Value And Wage Determinants In The Nhl, Sean Watterson Dec 2009

Position Value And Wage Determinants In The Nhl, Sean Watterson

All Theses

The landscape of the NHL has changed significantly following the lockout season that began in 2004. This paper studies the effects of the rule changes that followed the lockout, the rule changes effect on the documented discrimination against French Canadian players, and models the determinants of wage in the NHL for the three positions in the NHL: forward, defenseman, and goaltender.
The rule changes and stricter enforcement of existing rules resulted in an increase in average scoring by all teams. The rule changes caused the value of scoring to decrease, and they increased the value of skilled defensemen, particularly those …

Go to article

Charging Kinetics Of Electric Double Layer Capacitors, Clint Cagle Dec 2009

Charging Kinetics Of Electric Double Layer Capacitors, Clint Cagle

All Theses

A recent increase in the popularity of EDLCs and AC-EOF has necessitated a deeper understanding of the structure and charging kinetics of electrical double layers (EDLs) at electrode-electrolyte interfaces. Here, the charging kinetics of EDLs in nanoscale EDLCs is studied by a circuit model, a Poisson-Nernst-Planck (PNP) mo del, and molecular dynamics (MD) simulations. The results of the MD simulations demonstrate a linear charging behavior of EDLs near planar electrodes for both aqueous and organic electrolytes at charging below 90% and time larger than tens of picoseconds. Additionally, we will show that the circuit and PNP models are capable of …

Go to article

Investigation Of The Thermoelectric Behavior And Structure Formation Of (Pbte/Agsbte2)-Silver Chalcogenide Mixtures, Yisha Wang Dec 2009

Investigation Of The Thermoelectric Behavior And Structure Formation Of (Pbte/Agsbte2)-Silver Chalcogenide Mixtures, Yisha Wang

All Theses

Sustainable energy research is currently on the forefront of scientific exploration and energy conservation and the development of new energy production techniques are both crucial for our long lasting stable future. Accordingly, thermoelectric materials will be a significant energy conservation and production source. The state-of -the-art thermoelectric materials can be used to collect the wasted heat and converted to power, which is the future for the green power generation.
PbTe is considered a state-of-the-art thermoelectric material, which has been extensively studied. It forms in the NaCl structure and it is a semiconductor with a room temperature gap value of 0.29 …

Go to article

Cloning And Expression Of Porcine Dicer And Argonaute-2, Heather Stowe Dec 2009

Cloning And Expression Of Porcine Dicer And Argonaute-2, Heather Stowe

All Theses

In vitro-produced embryos exhibit aberrations in development, but the reasons for these developmental problems are unknown. Recently, a class of small non-coding RNA called microRNA (miRNA) has been described and reported to have roles in normal mammalian embryonic development. These miRNAs are encoded in the genome, transcribed by RNA pol II and processed into fragments approximately 22 nt in length by ribonuclease enzymes, the final one being a protein called Dicer. miRNA work through the RNA-induced silencing complex (RISC), of which the argonaute gene family are key proteins. Argonaute-2 (Ago2) has been identified as the only member possessing endonuclease activity, …

Go to article

Digital Social Imagery In Silhouette, Ashley Triplett Dec 2009

Digital Social Imagery In Silhouette, Ashley Triplett

All Theses

Society places an extreme emphasis on outward appearance and beauty that is often unattainable. The short film, Silhouette, reminds audiences of the dangers that can result from society's infatuation with physical perfection, and the film's production is the focus of this thesis. The goal of the film is to effectively communicate the impact of society on an individual's self-worth and self-image and to illustrate the consequences that result when trying to attain physical perfection. An integral part of this project is an examination of how women have been portrayed in art historically as compared to present day. To visualize …

Go to article

Molecular Analysis Of Split Hand/Foot Malformation (Shfm) At The Shfm3 And Shfm5 Loci, Megan Chryst-Ladd Dec 2009

Molecular Analysis Of Split Hand/Foot Malformation (Shfm) At The Shfm3 And Shfm5 Loci, Megan Chryst-Ladd

All Theses

Split hand/foot malformation (SHFM) is a congenital limb malformation observed in humans characterized by a reduction or loss of the central digits of the hands and/or feet. The condition affects one in every 8,500 to 25,000 births, accounting for 8-17% of all limb reduction defects. A tandem duplication of approximately 500 Kb has been determined to be the causative mutation at the SHFM3 locus. Patients that are heterozygous for this duplication have three copies of the genes BTRC, POLL, and DPCD as well as an extra copy of exons 6-9 of FBXW4. The SHFM3 critical region also contains the FGF8 …

Go to article

Filtering Noise Caused By Sensor Selection For An Ultra-Wide Band Position Tracking System, Danyan Ganjali Dec 2009

Filtering Noise Caused By Sensor Selection For An Ultra-Wide Band Position Tracking System, Danyan Ganjali

All Theses

A filter designed to be optimal for alternating multi-sensor tracking systems is presented. This filter can be used on ultra-wide band position tracking systems such as the Ubisense system. In this thesis, a comprehensive evaluation of the accuracy of the Ubisense tracking system in a multi-room building is given. Then the multi-modality of the noise distribution of such a system is shown. A multi-sensor tracking system is then simulated and a Kalman filter is used to filter the measurements. It is shown that the Kalman filter is not optimal for such a system and the need for a filter that …

Go to article

Design And Analysis Of Alternating Spoke Pair Concepts For A Non-Pneumatic Tire With Reduced Vibration At High Speed Rolling, Shashank Bezgam Dec 2009

Design And Analysis Of Alternating Spoke Pair Concepts For A Non-Pneumatic Tire With Reduced Vibration At High Speed Rolling, Shashank Bezgam

All Theses

Recently, Michelin has invented an innovative non-pneumatic tire which has potential for improved handling, grip, comfort, and less rolling resistance when compared to a traditional pneumatic tire. The non-pneumatic wheel is manufactured from a molding process with integrated shear ring and collapsible spokes designed to provide optimal uniform ground contact patch with low rolling resistance. The shear band is constructed from a polyurethane material with imbedded inextensible reinforcements. During high speed rolling in initial testing, the original prototype showed high noise levels at frequencies above 100 Hz. A possible source of noise could be due to vibration initiated from the …

Go to article

Risk Assessment Of Bird Aircraft Strike Hazard For Grassland Birds At The Mcentire Air National Guard Station, Eastover, South Carolina, Marla Hamilton Dec 2009

Risk Assessment Of Bird Aircraft Strike Hazard For Grassland Birds At The Mcentire Air National Guard Station, Eastover, South Carolina, Marla Hamilton

All Theses

ABSTRACT
There are strict regulations surrounding vegetation management at military airfields for the purpose of reducing Bird Aircraft Strike Hazards (B.A.S.H.). At military installations vegetation heights are set between 17 to 38 cm to discourage the use of animal species such as flocking birds, soarers (e.g. raptors), large wading birds (e.g. herons), and waterfowl that create hazards to flying aircraft. Within designated clear zones, managers have typically promoted the growth of non - non-native grasses without much consideration for how these plantings might impact B.A.S.H. potential, bird occupancy, or avian conservation. Grasslands and grassland associated avifauna are among the 'highest …

Go to article

The Effects Of Ethnic Identity On The Assimilation Behaviors Of Second Generation Immigrants, Emily Baumann Dec 2009

The Effects Of Ethnic Identity On The Assimilation Behaviors Of Second Generation Immigrants, Emily Baumann

All Theses

This thesis examines the effects of ethnic identity on assimilation behaviors in second generation immigrants. It looks at two types of ethnic identity--one that is an internal, self-identification and one that is an external, objective designation. More specifically, this study reviews the effects of ethnic identity on how well a respondent writes a foreign language, how well a respondent writes English, language the respondent prefers to speak, total monthly earnings, and highest level of education achieved. This study hypothesizes that various ethnic self-identifications and various nationalities will be predictors of various assimilation pathways set forth in the segmented assimilation theory. …

Go to article

Provinializing World Literature: Tristram Shandy And Midnight's Children As Precursors To Current Postcolonial Critical Theory, Rachel Jordan Dec 2009

Provinializing World Literature: Tristram Shandy And Midnight's Children As Precursors To Current Postcolonial Critical Theory, Rachel Jordan

All Theses

Postcolonial critical theory is currently experiencing a period of upheaval. It is becoming increasing clear that the field's concentration on geopolitical bifurcation has provided an incomplete paradigm for critical literary analysis. The current approach incorrectly separates literature (and the analysis thereof), into that of former colonies and that of former colonial powers, with each having distinct critical methodologies that are considered appropriate. I argue that Dipesh Chakrabarty's method of provincializing, or the constant accumulation of new and divergent viewpoints to shape analysis through an iterative process, is a promising, but not new, critical paradigm.
Chakrabarty's contribution to postcolonial studies is …

Go to article

Monitoring Co Concentration In Fuel Cells Using Microcantilever Sensors, Tugba Demir Dec 2009

Monitoring Co Concentration In Fuel Cells Using Microcantilever Sensors, Tugba Demir

All Theses

Estimating the concentration of gases including carbon monoxide (CO) in the hydrogen fuel exiting the reformer and entering the fuel cell is imperative. A high concentration of CO can cause fuel-cell catalyst poisoning, which permanently destroys the cell. Current practices call for utilizing expensive and bulky spectral analyzers to achieve this task. In addition to their high cost, these methodologies, undoubtedly, hinder the portability and self-containment of the cell. To overcome these problems and achieve the desired objectives of a portable, self-contained, and real-time measurement module, this thesis presents and experimentally investigates a new enabling technology based on utilizing an …

Go to article

Friction Stir Welding Process And Material Microstructure Evolution Modeling In 2000 And 5000 Series Of Aluminum Alloys, Harshavardhan Yalavarthy Dec 2009

Friction Stir Welding Process And Material Microstructure Evolution Modeling In 2000 And 5000 Series Of Aluminum Alloys, Harshavardhan Yalavarthy

All Theses

Interactions between the rotating and advancing pin-shaped tool (terminated at one end with a circular-cylindrical shoulder) with the clamped welding-plates and the associated material and heat transport during a Friction Stir Welding (FSW) process are studied computationally using a fully-coupled thermo-mechanical finite-element analysis. To surmount potential numerical problems associated with extensive mesh distortions/entanglement, an Arbitrary Lagrangian Eulerian (ALE) formulation was used which enabled adaptive re-meshing (to ensure the continuing presence of a high-quality mesh) while allowing full tracking of the material free surfaces. To demonstrate the utility of the present computational approach, the analysis is applied to the cases of …

Go to article

Evaluation Of An Online Intelligent Transportation System (Its) Asset Management System, Tahera Anjuman Dec 2009

Evaluation Of An Online Intelligent Transportation System (Its) Asset Management System, Tahera Anjuman

All Theses

Intelligent Transportation System (ITS) enhances the performance of modern transportation systems by improving the reliability of travel times and reducing the risk of collisions and injuries. Recently, many public agencies have expressed a need for an ITS asset management system that will effectively and efficiently meet their requirements of managing associated resources, which often includes technologically sophisticated devices, computer hardware and software, and communications infrastructure. To address this need, the author evaluated different asset management systems for their potential efficacy to support public agencies requirements for an ITS asset management system. These requirements were identified through a nationwide survey of …

Go to article

First Prev Next Last