Digital Commons Network^™

Enhancement Of Jet Impingement Heat Transfer Using Shape Modification And Phase Change, Yacob Mesfin Argaw

Theses

The overall goal of the present study is to enhance heat transfer rate performance on high heat flux surfaces while maintaining a uniform and low temperature of the substrate. The specific objectives are to determine shapes which maximize heat transport from heater surfaces when using jet impingement cooling method and to model a two phase jet impingement process which incorporates phase change at the impingement substrate. A very high heat flux of up to 10MW/m2 is applied at the bottom of a heated chamber and a jet of air and water are applied separately to a confined control volume. Free …

Museum Education And Professional Development Partnerships: How The Educational Programs Of Museums Enhance Career Goals And Professional Development Skills In Adults, Victoria A. Jensen

Theses

No abstract provided.

Assessing Interpretability Of Visual Symbols Of Varied Colors Across Demographic Profiles, Brendan Parker

Theses

Visual symbols are often ambiguous. An icon is meant to convey a particular meaning, but viewers may interpret the image differently. This thesis shows how a viewer`s demographic background and icon color can affect their interpretation of a symbol. A website survey, featuring a library of icons, asked users of varied demographic profiles to interpret each figure presented randomly in one of five colors: black, blue, red, green, and orange. The qualitative text data from the participants` interpretations were compared to the quantitative data from icon and demographic information by means of multinomial logit analysis. The experiment found numerous noteworthy …

The Role And Positioning Of Public Relations In Non Profit Organisations: A Case Study Analysis, Gillian Lyons

Theses

This study aims to explore the role and positioning of public relations (PR) in non-profit organisations (NPO’s). Two case studies are explored namely the Mercy Hospital Foundation and the Cork Simon Community. The lack of research in the area along with the belief that NPOs rely on PR more than any other industry prompted the research idea for this study.

The literature review deals with the need for PR to be accepted as a management function with many leading theorists agreeing on the matter. According to Grunig (1992), the organisational effectiveness theories provide organisations with the formula to make their …

Can The Effectiveness Of An Online Tourism Public Relations Campaign Be Evaluated?, Deirdre Mangan

Theses

The practice of public relations has changed dramatically in the past fifteen years, embracing a variety of new media tools in a fast changing, global market. New and social media have radically altered the work of public relations practitioners. One aspect of this which gives rise to much debate is evaluating the effectiveness of online public relations campaigns.

Travel and tourism is an industry that has been changed fundamentally by the internet. This industry led the way with online reservations and information systems. Online public relations followed this innovation. The aim of this study is to look at the process …

Zackup, A Scalable Centralized Backup Service, Benjamin Allen

Theses

The currently available open source, centralized to disk, backup services use a custom data storage structure to effectively store backup sets. While cus- tom data storage structures are necessary to store backup sets in differential or space efficient manner, they often lead to hard to navigate structures and increase the complexity of the backup service. To solve these problems a backup service was developed that relies on the Sun Microsystems, Inc. open sourced file system ZFS. With the variety of features ZFS includes, the major- ity of common tasks to create backup sets were delegated to the file system. Along …

The Pathology Of Addiction, Janis Dougherty

Theses

The field of addiction has grown exponentially in the last 60 years with abundant research and results. Today we understand that addiction is less of a disease and more of a choice, however, it continues to be a perplexing disease. The focus of this thesis project is to condense the theories presented in Dr. Ronald Ruden's book The Craving Brain into a 7 minute animated film. The film illustrates three major topics outlined in the book: "Landscaping the Brain", stress, and neurotransmitters. The conclusion ties it all together showing how each individual piece contributes to the makeup of the addictive …

Influence Of Coulomb Interactions On Emission Dynamics In Semiconductor Quantum Dot Systems, Kamil Gradkowski

Theses

In this thesis the novel self-assembled quantum dots based on GaSb/GaAs technology are investigated for the possible application in the near- and mid-infrared, i.e. telecommunication networks, solar cells, gas sensors and imaging systems. These heterostructures exhibit a type-Il band alignment, which means that one species of carriers is confined to the dot, while the other is outside in the surrounding matrix. This physical separation of carriers leads to profound Coulomb interactions, which makes the optical properties of these structures dependent on the injected charge density. The relationship between two of those properties, the emission energy and transition probability, leads to …

Application Of Liquid Chromatography - Tandem Mass Spectrometry For The Determination Of Veterinary Drug Residues In Food Of Animal Origin, Brian Kinsella

Theses

The QuEChERS (quick, easy, cheap, effective, rugged and safe) sample preparation approach was evaluated for the extraction of anthelmintic residues from bovine milk and tissues. Liquid chromatography coupled to tandem mass spectrom.etry (LC- MS/MS) was used for detection and quantification of residues, which included the benzimidazoles (BZs), macrocyclic lactones (MLS) and the generally overlooked flukicides.

Initial work focused on the optimisation of a QuEChERS method to effectively extract anthelmintic residues from milk and liver. The method involves the extraction of residues with acetonitrile (MeCN) in the presence of salts (MgS04 and NaCl) to induce phase separation. After shaking and centrifugation, …

Scaling A Single Element Combustor To Replicate Combustion Instability Modes Of A Liquid Rocket Engine, Brian A. Sweeney

Theses

This research evaluated a method of scaling a single element sub-scale combustor to match the combustion instability modes of a full-scale liquid rocket engine. The experiments used a shear-coaxial injector in an atmospheric chamber using gaseous oxygen and a heated gaseous methane/nitrogen fuel mixture. The flow conditions matched the full-scale equivalence ratio, propellant velocities and propellant volumetric flow rates. The first set of experiments empirically determined the effect of chamber diameter on chamber temperature. The results were used to calculate the dimensions of the sub-scaled combustion chamber that would match the transverse frequencies of the full-scale engine. The scaled chamber …

The Effects Of Chamber Pressure Variation On Swirl Injector Atomization, Chad Jonathan Eberhart

Theses

No abstract provided.

Evaluating Combustion Instability In A Sub-Scale Combustion Experiment With Three Scaling Parameters, John Whitlock Brooks

Theses

No abstract provided.

Development Of A Hover Test Bed, Jason Alan Williams

Theses

No abstract provided.

‘Remember The Peasantry’: A Study Of Genocide, Famine, And The Stalinist Holodomor In Soviet Ukraine, 1932-33, As It Was Remembered By Post-War Immigrants In Western Australia Who Experienced It, Lesa Melnyczuk Morgan

Theses

In 1936 Joseph Stalin offered what he called ‘friendly advice’ to his Communist allies in war-torn Spain: ‘One should pay attention to the peasantry, which...is of great importance.’¹ So important, indeed, was the peasantry to the security of the Communist state that Stalin had adopted ruthless, widespread policies in the Soviet Union to ensure their compliance with the centralised regime in Moscow.

The devastating famine experienced in Soviet Ukraine from 1932 to 1933 was an example of such ruthless policies of Stalin’s government. Some scholars argue that in the space of a year up to ten million people died …

Evaluation Of The Current Knowledge, Attitude And Perception Of End-Of-Life Electronics Among Students Of Selected North Carolina Universities Located In Guilford County, Bethany L. Clark

Theses

The purpose of the present study was to determine how much the general student population understands about the dangers and lost value that result from not properly recycling end-of-life (EOL) electronic devices. It was believed that changing the language associated with EOL electronics would, in turn, change the disposal practices of the general student population. College students at North Carolina Agricultural and Technical State University (NC A&T SU) and the University of North Carolina at Greensboro (UNCG) were chosen for this study because college students are a large group of electronic device consumers and because they are the next generation …

Validation Of The Forebody Design Of A Ramjet-Scramjet Propulsion System Using Computational Fluid Dynamics, Jamil D. Grant

Theses

The objective of this study is to effectively model and independently analyze the three dimensional forebody, inlet, and isolator of a conceptual Four-Point-Star Morphing Ramjet-Scramjet Engine. The analysis was conducted using computational fluid dynamic (CFD) softwares, namely, the Air Vehicle Unstructured Solver (AVUS) and FLUENTTM . Ultimately a steady, three dimensional, double precision solver was used to model and analyse this very complex problem. The morphing ramjet-scramjet engine is very unique in that, this engine actually changes its geometry to obtain optimal thrust efficiencies. This engine is capable of operating in many different propulsion regimes. The propulsion regime of interest …

Genetic And Evolutionary Feature Selection And Weighting For Face Recognition, Tamirat Abegaz

Theses

In this thesis, we have Investigated the hybridization of genetic-based feature selection (GEFeS), genetic-based feature weighting (GEFeW) and LBP-based face recognition techniques. The results indicate that feature selection and weighting enhances the overall performance of LBP-based face recognition techniques. In addition, the results show that GEFeS reduces the number of features needed by approximately 50% while obtaining significant improvement in the accuracy. GEFeS improves the accuracy from 70.36 to 96.62 (in the case of LBP-GEFeS) and from 70.71 to 96.43 (in the case of oLBP-GEFeS) respectively.

Antimicrobial Activity Of Copper Alone Or In Combination With Lactic Acid On The Growth Of Escherichia Coli O157:H7 In Laboratory Medium And On The Surface Of Lettuce And Tomatoes, Rabin Gyawali

Theses

In recent years, Escherichia coli O157:H7 has been a major foodborne pathogen associated with fresh produce. Many outbreaks of foodborne illnesses have raised concerns in the microbial safety of fresh produce. Several different treatment solutions are being used to decontaminate fresh produce, but still it is very difficult to guarantee the microbiological safety. Therefore, the development of effective treatment for reducing E. coli O157:H7 on fresh produce is needed. The objectives of this study were to investigate the effect of copper alone or in combination with lactic acid on the survival and growth of E. coli O157:H7 in laboratory medium …

Major Factors Affecting The Growth Of Emerging Consulting Companies In Kosovo : [Presentation Given May 27, 2010], Leke Zogaj

Theses

There are many problems and challenges confronting small consulting companies in Kosovo today. The major factors involved form the basis of the problem that is described in this proposal. The Kosovo market has its unique characteristics that local companies are having to face as well as general factors affecting companies all around the world. These factors are listed below a) General Factors, b) East Europe Factors, and c) Kosovo specific Factors: A) General Factors 1) Technology 2) Globalization 3) Innovations 4) Fast changing markets B) East Europe Factors 1) Post communist market 2) Privatization 3) Business Processes C) Kosovo Specific …

Prishtina International Airport: Capacity Expansions And Service Standards : [Presentation Given August 20, 2010], Bujar Ejupi

Theses

Not provided.

A Multi-Sensor Chip For Monitoring The Quality Of Drinking Water, Heidi Purrington

Theses

A MEMS based multi-sensor chip has been developed for the purpose of monitoring turbidity, TDS, and temperature in a sample of drinking water. The benefits of MEMS technology over conventional sensors include compact size, low power consumption, integration capability, and low cost bulk manufacturing. Two revisions of the multi-sensor silicon chip were designed, fabricated, and tested. The layout of the chip and the fabrication process were redesigned in the second spin to provide more robust and sensitive responses. The sensor structures include photodiodes, temperature diodes, interdigitated electrodes in direct contact with the sample, and capacitive interdigitated fingers. The sensors were …

A Survey Of Transition Strategies To Improve The Performance Of Chord In The Face Of Rapidly Changing Ip Addresses, Timothy Ecklund

Theses

Mobile wi-fi enabled devices are becoming less expensive and more common all the time. The field is ripe for DHTs like Chord. Given the highly scalable nature of DHTs, the ability to efficiently tap the storage resources of so many devices is very attractive. Unfortunately DHTs have been having a difficult time finding a foothold on mobile devices due to poor performance, both in terms of network overhead and lookup failure. Much of the research that has been done attributes this poor performance to the extra hops packets must make due to the mismatch between the physical topology and the …

Murky Waters, Akmal Hanan

Theses

In this feature length screenplay, three boys (friends) grow up together in a conflict zone in northern province of India. Braving the hostile socio-political environment, one of them joins a rebel group fighting the state forces for what they call liberation of their land. He soon gets disillusioned with the mindless violence from both the sides but finds himself into this quagmire where neither the rebels nor the state would spare his life. The other two friends who are equally affected by the hostile environment help him to flee the country.

Criteria For Promoting A Regional Electricity Market And Benefits To Kosovo : [Presentation Given February 23, 2010], Faton Aliu

Theses

South East Europe (SEE) is moving rapidly toward the creation of a regional electricity market and wholesale electricity market/power exchange that will improve competitive performance and increase liquidity and reliability. Kosovo’s utility leaders are very interested in becoming active partners in a well-developed regional electricity market. In order to achieve this then certain criteria have to be met. This capstone project gives a general background of electricity markets with developments in Europe and especially Southeast Europe (SEE) for meeting the criteria for promoting a more integrated regional electricity market. Eight criteria to be discussed are: Supply and demand conditions, Trading …

Comparison Of Particle Deposition For Realistic Adult And Adolescent Upper Airway Geometries Using Unsteady Computational Fluid Dynamics, Jonathan Steffens

Theses

Particle deposition in the respiratory tract is studied in order to better understand the negative health effects due to cigarette smoke inhalation. Until recently, idealized models of the respiratory airways based on the original Weibel model have been used to calculate deposition. These models consist of symmetric bifurcating airways and do not take into account variations of airway diameter, and asymmetry in the human respiratory tract. Until recently, little work has been done to accurately recreate the entire upper respiratory tract including the oral cavity, pharynx, and larynx. Technological improvement has changed the way in which researchers approach this problem. …

Development Of Plasma Enhanced Chemical Vapor Deposition (Pecvd) Gate Dielectrics For Tft Applications, Germain L. Fenger

Theses

This study investigated a variety of electrically insulating materials for potential use as a gate dielectric in thin-film transistor applications. The materials that were investigated include silicon dioxide and oxynitride films deposited using PECVD and LPCVD techniques. Silicon source materials included tetraethylorthosilicate (TEOS) and silane (SiH4). Oxygen sources included diatomic oxygen (O2) and nitrous oxide (N2O). The optical, electrical, and material properties of the dielectrics were analyzed using Variable Angle Spectroscopic Ellipsometry (VASE), Fourier Transform Infrared Spectroscopy (FTIR), Capacitance-Voltage (C-V) analysis and current-voltage (I-V) analysis. Transistors were also fabricated at low temperatures with different gate dielectrics to investigate the impact …

Evolutionary Spectral Co-Clustering, Nathan S. Green

Theses

The field of mining evolving data is relatively new and evolutionary clustering is among the latest in this trend. Presently, there are algorithms for evolutionary k-means, agglomerative hierarchical, and spectral clustering. These have been excellent in showing the advantages of using evolving data snapshots for better clustering results. From these algorithms the key portion of the conversion from static data handling to evolving data handling has been the addition of the historical cost function. The cost function is what determines whether or not instances should be moved from one cluster to the next between time-steps based on the historical cuts …

From Medical Images To Individualized Cardiac Mechanics: A Physiome Approach, Chun Wong

Theses

Cardiac mechanics is a branch of science that deals with forces, kinematics, and material properties of the heart, which is valuable for clinical applications and physiological studies. Although anatomical and biomechanical experiments are necessary to provide the fundamental knowledge of cardiac mechanics, the invasive nature of the procedures limits their further applicability. In consequence, noninvasive alternatives are required, and cardiac images provide an excellent source of subject-specific and in vivo information. Noninvasive and individualized cardiac mechanical studies can be achieved through coupling general physiological models derived from invasive experiments with subject-specific information extracted from medical images. Nevertheless, as data extracted …

Enhanced Vacuum Drying Through Improved Solvent Recovery, Reduced Process Cycle Times And Prediction Of Drying Duration, Diana Patricia Mesa Delgado

Theses

Drying of pharmaceuticals and fine chemicals is often accomplished under vacuum conditions to enhance energy efficiency and to avoid overheating of thermo sensitive materials. This project aims to study vacuum drying operations to obtain a better understanding of this process so as to optimize drying performance. This project obtained industrial data collected from a range companies in Ireland.

Pharmaceutical companies started assessing processes and making changes to drying processes from 2004 onwards; these initiatives are due to economic pressures, environmental issues and the Process Analytical Technology (PAT) initiative launched by the FDA in 2004.

Vacuum drying has been used in …

How Independent Irish Music Artists Are Practising Online Pr Techniques By Utilising Social Media Tools., Áine Cullen

Theses

This Dissertation explores how the evolution of social media is enabling Irish Independent music artists to publicise their music. It aims to explore the online public relations techniques that Independent Irish music artists are using and determine whether they are embracing it.

A qualitative research design was chosen and the primary method used to gather the data were in-depth interviews with PR professionals in the music industry, PR directors, major record labels. Independent record labels and Irish music artists that practice social media.

The research findings reveal how beneficial social media are for Independent music artists and show how social …