Digital Commons Network^™

Cold Flow Simulation Of Vortex Shedding In A Segmented Solid Rocket Motor, Rasheed Durojaye

Theses

Combustion instabilities are a major problem in large solid rocket boosters. They are responsible for exciting undesirable oscillations in the propellant burn rate. It is believed that vortex shedding from upstream inhibitors is one of the phenomena responsible for the onset of these instabilities. Vortex shedding frequencies are time dependent due to the unsteady nature of the flow inside the rocket motor. When one of these frequencies coincides with a structural frequency, the oscillations can increase substantially. The protruding inhibitors are caused by their slow burn rate compared to that of the fuel. In the current research, cold flow simulations …

Failure Analysis Of Braided U-Shaped Metal Bellows Flexible Hoses, Stephen O. Pierce

Theses

No abstract provided.

Weapons Bay Acoustic Suppression Using A Novel Rod In Crossflow Configuration, Shane Lackey

Theses

No abstract provided.

Magnetic Field Mapping In The Plasmoid Thruster Experiment, Coby W. Mccolgin

Theses

No abstract provided.

Rocket Motor Segmenting, Jeffrey Lynn Lee

Theses

No abstract provided.

Chemical Components Of Fraxinus Americana And Fraxinus Pennsylvanica Of Northern Alabama, Twaskia S. Johnson

Theses

No abstract provided.

Numerical Optimization Of A Liquid Propellant Settling Scenario, Josh Rojahn

Theses

No abstract provided.

Feasibility Of Backing Up Server Information In A Distributed Storage Using Client Workstations Hard Drives, Raúl Rafael Acevedo Cárdenas

Theses

As a consequence of nowadays large hard disk capacities, we can frequently find many networks in corporate environment with a considerable amount of unused hard disk storage space dispersed among all its computers. In an immediate future, the purpose of this unused space is unclearly defined and represents a waste of resource. Several studies suggest and evaluate numerous ways to take advantages of workstation unused hard disk space in a network. However, there are no evidences of studies that consider disk-based backup, distributed storage, and the unused workstation storage aiming at backing up server information in small business network. Determining …

A Competitive Gaussian Model And Linear Regression Technique For Modeling Mst Neuron Receptive Field Responses For Primate Perception Of Self-Motion, Jeffrey Robble

Theses

This thesis presents a linear regression technique applied to non-linear features extracted from a scaled Gaussian mixture model (SGMM) to describe the receptive field (RF) behavior of neurons in the Medial Superior Temporal region of the brain of Rhesus monkeys which viewed visual stimuli on a projector screen. The stimuli consist of simple and complex combinations of planar, circular, and radial motion and neuron responses were recorded in spikes/second. It is our goal to understand the neuronal responses of the primates to these stimuli and to create a model capable of predicting how the RFs in the primates' neurons respond …

An Investigation Of Female Career Progression And Development In The Irish Hospitality Industry., Richella Ryan Devereaux

Theses

In recent years, the increasing number of women at the lower positions in the hospitality industry and their underrepresentation in top management positions has made women’s status in the industry a great concern. The purpose of this study is to examine the career progression of female graduates in the Irish hospitality industry.

A qualitative approach in the form of in-depth interviews of twenty-one female middle and senior managers in the Irish hospitality industry provided the opportunity to gain insights into their experiences and barriers faced in advancing their careers to senior management positions.

The results of the current study identify …

Social Media Marketing In Performing Art Centers, Natalia V. Ryzhkova

Theses

In the reality of an economic recession and increasing competition in all sectors of economy, companies strive to find more effective and efficient ways to increase brand awareness and market their services. This study investigates one such effort used in the entertainment side of the tourism sector – social media marketing. Specifically this research looks at how Performing Art Centers are developing social media marketing. Developing an effective viral marketing strategy within the social media landscape requires being aware of the current usage of social media by Performing Art Centers in their attempt to market the services to their target …

Cultural Impacts Of Tourism: The Case Of The “Dogon Country” In Mali, Mamadou Ballo

Theses

Cultural tourism began to be recognized as a distinct product category in the late 1970s when tourism marketers and tourism researchers realized that some people traveled specifically to gain a deeper understanding of the culture or heritage of a destination (Tighe, 1986). In most regions of the world, particularly in Europe and North America, cultural attractions have become important in the development of tourism. At the global level, cultural attractions are usually perceived as being icons of important streams of global culture (Richards, 2001). Unfortunately, in developing countries, in which much of the earth's magnificent heritage is located, the preservation …

Addressing The Gender Gap: Teaching Preadolescent Girls Computer Networking Concepts, Cynthia Strong

Theses

Due to the decline in the number of professional women entering labor markets in the area of computing and technology, there is a need for intervention. Focus should be given to improving these numbers by creating an early interest in women in computing and technology. This thesis focuses on developing educational modules that will create interest in networking concepts in preadolescent girls. Educational best practices, fundamentals of how people learn, assessments of pedagogy effectiveness, observations, and personal experiences frame the modules. Research such as this in the area of creating early interest will help address the issue of equal opportunity …

Performance Evaluation Of Multicast Routing On Ipv4 And Ipv6 Networks, Suneetha Hari

Theses

Even though the transition from IPv4 to IPv6 has not been realized at the pace that it was anticipated, eventually with the depletion of IPv4 address space and the ever-growing demands of the Internet, the transition is inevitable. In the rapidly evolving world of technology, multimedia applications and voice/video conferencing are fast finding their ways into the Internet and corporate networks. Multicast routing protocols run over unicast routing protocols to provide efficient routing of such applications. This thesis was aimed at understanding how the transition from IPv4 to IPv6 would impact multicast routing. The multicast routing protocol Protocol Independent Multicast-Sparse …

A Framework For Analysis Of Spatial Specialisations Of Industry, John Hobbs

Theses

Concentrations of firms in an industry sector within a geographic space or region have exercised the minds of economists for more than 100 years. Several models attempt to analyse the interactions and dynamics of such concentrations. Industry clusters (Porter, 1990) and industrial districts (Becattini 1978, Piore and Sabel 1984, Scott 1988a 19886, Storper 1989) are well known examples.

Yet debate continues about the validity of such models and how they function. While cluster theory has many adherents, spatial boundaries of a cluster and its determinants of competitive advantage remain controversial. Several variants of industrial district have been analysed, and according …

The Changing Face Of Print Media : How New Attitudes To Communication By Both Industries Could Affect Public Relations., Paul Kennedy

Theses

Digital media is a phenomenon that has affected many industries, particularly both print media and public relations. Communication is something is at the heart of both of these industries. In this thesis, communication theory is explored in a digital media and print newspaper context, in relation to these industries. It is explored how both industries are using similar techniques, and the merit of these approaches are investigated and discussed. Included in this are the value of new news outlets and new and old business models. Opinions on modem media relations are investigated and the weight of third- party endorsement is …

Politics 2.0 : The Emergence Of New Media And Its Impact On Political Communication In Ireland: A Public Relations Perspective, Gerald Counihan

Theses

Political communication occurs as a by-product of any political action. It can either be managed or not. The traditional methods of communication are still very prevalent in Irish political communication. The party maintains a strong role in communicating, but it does not infringe overly much on is national and local representatives.

The traditional mass media are play a crucial role in facilitating communication but the emergence of web 2.0 applications in social media is slowly beginning to revolutionise political communication in Ireland.

The evolution of communications tools over the past number of years has revolutionised the PR industry, and therefore …

Exploring Aspects Of Social Change In A Newly Multi-Cultural Community, Mary Hopkins

Theses

This research explored aspect of the social changes attached to the arrival of immigrants in a smaller-type rural community. It was particularly concerned with how this newly multicultural community was adapting to and accepting of a new social identity.

This study may have provided the first opportunity for locals and new-comers to engage with the nature of changes happening in the community and to speak out on what they had to say.

Qualitative in-depth interviews were conducted with 5 local population members, 5 adult immigrants and 2 support service staff. This research examined levels of cultural nationalism among local respondents, …

Why Moms Drink, Anne Freeman

Theses

The personal narratives and poems contained within this thesis explore one of the most primal and powerful relationships in the human experience, that of a parent and child. As a mother of a young boy, I have found, and continue to find my greatest strength, so1Tow, and inspiration in watching him grow.

The collection as a whole does tell a complete story, although not necessarily a chronological one. It is strongly influenced by the creative nonfiction work of David Sedaris. Like Sedaris, these essays portray everyday family relationships, often in less-than- flattering ways. In a similar style, these essays do …

Destination Competitiveness: An Analysis Of The Characteristics To Differentiate All-Inclusive Hotels & Island Destinations In The Caribbean, Leiseth Chambers

Theses

Purpose - Tourism is the mainstay of most islands within the Caribbean encompassing a great segment of their services industry. However, despite increasing maturity in the research literature about destination competitiveness, analyzing it from the hospitality professional's perspective remains a novel concept in research for destinations in the Caribbean region. In light of this, the purpose of this study is to identify the distinguishing factors determining the competitiveness of Small Island Destinations within the Caribbean. Specifically, the research examined the features, experiences and strategies that all-inclusive hotels and resorts use to differentiate themselves from other properties within their island and …

A Two Degrees-Of-Freedom (Dof) Scanning Micromirror Using Thermocapillary Effect In Microdroplets, Rakesh Dhull

Theses

This thesis research proposes a novel and simple means of tilting micromirror on a microdroplet by utilizing thermocapillary actuated droplet deformation. Device theory, device design, fabrication, packaging, testing and results are discussed to demonstrate the operation of a 2-degrees-of-freedom (2- DOF) scanning micromirror. Thermocapillary, or Marangoni, effect and contact angle hysteresis are employed to control the droplet shape and position. Hysteresis in different liquids is studied with its influence on the stability of the droplet. The device consists of a micromirror placed onto a microdroplet, and can produce a 6.5° tilting angle when actuated at 30 V. The tilting angle …

Development Of An Air Quality Monitoring Network For Kosovo : [Presentation Given December 13, 2010], Visare Hoxha

Theses

This Capstone Project addresses the important problem of air pollution in Kosovo and the need for improvement of the air quality monitoring system, in compliance with Directive 2008/50/ EC on Ambient Air Quality and Cleaner Air for Europe. This project has identified eight new possible locations taking in consideration all relevant information about the source of pollution, types of areas, number of inhabitants and other relevant factor. The outcome of this project is a functional and reliable Air Quality Network Monitoring System for Kosovo in order to facilitate the air quality assessment and improve air quality in Kosovo.

Accuracy Of Real Time Radiography Burning Rate Measurement, Bisola Olaniyi

Theses

The design of a solid propellant rocket motor requires the determination of a propellant's burning-rate and its dependency upon environmental parameters. The requirement that the burning-rate be physically measured, establishes the need for methods and equipment to obtain such data. A literature review reveals that no measurement has provided the desired burning rate accuracy. In the current study, flash x-ray modeling and digitized film-density data were employed to predict motor-port area to length ratio. The pre-fired port-areas and base burning rate were within 2.5% and 1.2% of their known values, respectively. To verify the accuracy of the method, a continuous …

Development Of A Liquid Oxygen Facility For Rocket Engine Injector Performance Testing, Henry W. Mulkey

Theses

This study demonstrated the successful operation of a new liquid oxygen - gaseous methane rocket engine test facility to characterize the performance of a swirl coaxial injector. In support of safe system functional development, an oxygen compatibility and hazards assessment was completed to identify and minimize operational risks. Facility changes were implemented to create a more fault tolerant system. Major upgrades included initiatives to manage the oxygen risk and mitigate specific oxygen ignition mechanisms. Oxygen compatible materials and facility configuration changes were instituted to achieve safer experimentation. The demonstration testing of the cryogenic propellant system employed the swirl coaxial injector …

Experimental Injector Element Stability Characterization And Combustion Imaging, Robert Lashawn Ikard

Theses

This research evaluated the stability characteristics of a swirl-coaxial injector in an atmospheric combustion chamber using gaseous oxygen and gaseous methane as the propellants. The experiment studies the mixing processes in a laboratory-scale analogue to full-scale engine operating conditions. The injector was tested over a range of mass flow conditions that matched specified scaling parameters for a notional space engine. The scaling parameters used were mixture ratio, velocity ratio, momentum ratio, and momentum flux ratio. A maximum amplitude of 3.52% of chamber pressure was measured when the injector was placed 19 mm from the chamber wall. The associated instability mode--determined …

Achieving Mars Sample Return On A Single Ares V Launch, Ashley Jones

Theses

No abstract provided.

Does Increasing Metacognitive Awareness Alleviate Retrieval-Induced Forgetting Effects, Lauren W. Jones

Theses

No abstract provided.

Utilising A Combined Exercise And Counselling Program To Examine The Relationship Between Emotional Self-Efficacy And Physiological Improvements In Breast Cancer Survivors, Jena K. Buchan

Theses

Breast cancer diagnosis in women has increased in recent years, though medical progress has helped more patients become survivors rather than victims. With cancer diagnosis and treatment, however, comes a host of psychological and physical side effects that must be addressed. Research has found exercise and counselling may decrease the detrimental effects of breast cancer, but programs have typically utilised these modalities separately. As psychosocial issues appear correlated with physical health, it is imperative to examine the mind-body connection and explore the benefits of a combination exercise and counselling program. One psychological variable of interest is emotional self-efficacy, which relates …

Models Of Faith And Reason, Peter Holmes

Theses

In his excellent work The Assurance of things Hoped For ¹ surveying the development of the understanding of “faith” in the context of the Christian religion, Avery Dulles provides a concise sketch of the historical development and current manifestation of seven 'models' of faith which still have some contemporary influence. This thesis takes each of the models of faith Dulles presents and gives a brief description of the model; offers some preliminary observations about the relationship between faith and reason in the respective models; and, by examining the Church's teaching on faith and reason in Fides et Ratio, discusses …

An Exploration Of The Study Abroad Experiences Of United States Students In Three Halls Of Residence At A Catholic University In Western Australia, Nicole Schiffer

Theses

The purpose of this research was to explore the ways United States students develop through studying abroad at a Catholic university in Western Australia. The significance of the research lies in the belief that host and home universities should be aware of the needs of these study abroad students. The needs of these students were understood through an exploration of the challenges faced, the support received, and the personal and professional development attained.

Four dimensions of the context contributed to an understanding of this study. These four dimensions were the University of Notre Dame Australia Fremantle, the UNDA three halls …