Digital Commons Network^™

Ink Jet Inks And Substrates - Novel Approaches For Their Physical And Optical Properties Characterization, Veronika Lovell

Dissertations

Undoubtedly, within the last couple of decades, the progress in non impact printing technologies has grown to an enormous level. In order to keep the development of this non impact printing method to grow even more, technicians, researchers and educators must continue in conducting investigation and provoking new ideas and questions that will lead to new outcomes and expansion of ink jet printing.

In this work, a broader area that comprises deep look into the ink jet ink and substrate performance, their physical properties and optical properties when printed is discussed in great details. Innovative techniques, novel materials and novel …

Electronic Government Accessibility For People With Blindness Or Low Vision Who Utilize Assistive Computer Technology, Robert J. Sobie

Dissertations

Citizen access to electronic government information and services continues to enjoy an expansionary phase in local government. This expansionary phase holds a prominent place in service delivery strategic planning as governments address on-going operational challenges caused by increased fiscal pressures and greater accountability to the citizenry for their actions. Since the advent of the World Wide Web, in the mid 1990s, static information and interactive applications are available on government websites to facilitate information dissemination and citizen interaction.

The presence of electronically delivered information and services may not address the accessibility needs of people with blindness or low vision who …

Healthcare Encounters Of Formerly Incarcerated Women: A Grounded Theory Study, Karen Sue Hoyt Phd

Dissertations

The adult correctional population in the United States soared to nearly 7 million people (Bureau of Justice Statistics [BJS], 2005). Over 2 million individuals were housed in prisons or jails in the United States. Nearly 7 percent (6.9%) were women (BJS, 2005). Recent trends in the adult correctional population suggest that there has been a stark increase in the number of formerly incarcerated women in the United States. The purpose of this research was to explore how formerly incarcerated women perceived their healthcare encounters. The aims of this study were to answer the following questions. How did formerly incarcerated women …

Critical Praxis: Using My Own Whiteness And Experiences To Challenge Issues Of Racism And White Privilege, Linda Selway

Dissertations

ABSTRACT

Autoethnography is a genre of research that alternately focuses its attention outwardly on the social and cultural, and inwardly on the personal life experiences of the researcher in an attempt to raise one’s consciousness and prompt action about the issue under study. This autoethnography explores the transformation I have undergone as I have grappled with the issues of race and academic achievement, and sought to find my place and voice in the struggle for social justice. Along the way, I have had to take a hard, sometimes painful look at myself, peeling away layers of defense to get at …

Study Of Propagation And Detection Methods Of Terahertz Radiation For Spectroscopy And Imaging, Aparajita Bandyopadhyay

Dissertations

The applications of terahertz (THz, 1 THz is 1012 cycles per second or 300 pm in wavelength) radiation are rapidly expanding. In particular, THz imaging is emerging as a powerful technique to spatially map a wide variety of objects with spectral features which are present for many materials in THz region. Objects buried within dielectric structures can also be imaged due to the transparency of most dielectrics in this regime. Unfortunately, the image quality in such applications is inherently influenced by the scattering introduced by the sample inhomogeneities and by the presence of barriers that reduces both the transmitted power …

Advanced Methods In Automatic Modulation Classification For Emerging Technologies, Hong Li

Dissertations

Modulation classification (MC) is of large importance in both military and commercial communication applications. It is a challenging problem, especially in non-cooperative wireless environments, where channel fading and no prior knowledge on the incoming signal are major factors that deteriorate the reception performance. Although the average likelihood ratio test method can provide an optimal solution to the MC problem with unknown parameters, it suffers from high computational complexity and in some cases mathematical intractability. Instead, in this research, an array-based quasi-hybrid likelihood ratio test (qHLRT) algorithm is proposed, which depicts two major advantages. First, it is simple yet accurate enough …

Dynamic Bandwidth Management With Service Differentiation Over Ethernet Passive Optical Networks, Yuanqiu Luo

Dissertations

Ethernet passive optical networks (EPONs) address the first mile of the communication infrastructure between the service provider central offices and the customer sites. As a low-cost, high speed technology, EPONs are deemed as the solution to the bottleneck problem of the broadband access network.

A major feature of EPONs is the utility of a shared upstream channel among the end users. Only a single optical network unit (GNU) may transmit during a timeslot to avoid data collisions. In order to provide diverse quality of service (QoS), the bandwidth management of the upstream channel is essential for the successful implementation of …

Novel Characterization Of Materials Using Thz Spectroscopic Techniques, Amartya Sengupta

Dissertations

Significant scientific and technical challenges within the terahertz (THz) frequency regime have recently motivated an array of new research activities. This involves numerous applications of this region of the electromagnetic spectrum between approximately 100 GHz (3mm) and 3 THz (100 µm) for both spectroscopy and imaging purposes. THz time domain spectroscopy is unique in that the time domain waveforms are measured and the complex optical constants are deduced directly without resorting to the Kramers-Kronig Analysis.

In this work, THz spectroscopy has been used to characterize different types of materials. Materials investigated consisted of semiconductors, gate dielectric materials, high energetic materials …

Mathematical Problems Arising In Interfacial Electrohydrodynamics, Dmitri Tseluiko

Dissertations

In this work we consider the nonlinear stability of thin films in the presence of electric fields. We study a perfectly conducting thin film flow down an inclined plane in the presence of an electric field which is uniform in its undisturbed state, and normal to the plate at infinity. In addition, the effect of normal electric fields on films lying above, or hanging from, horizontal substrates is considered. Systematic asymptotic expansions are used to derive fully nonlinear long wave model equations for the scaled interface motion and corresponding flow fields. For the case of an inclined plane, higher order …

Effect Of Polymorphic Phase Transformations Within An Alumina Layer On The Ignition Of Aluminum Particles, Mikhaylo Aleksiyovych Trunov

Dissertations

Experimental measurements of aluminum ignition temperature and models used to describe aluminum ignition are reviewed. It is shown that the current models cannot describe ignition of aluminum powders of different sizes and ignited under various experimental conditions. The properties of and phase changes occurring in the alumina scale existing on the surface of aluminum particles at different temperatures are systematically studied. The mechanism of aluminum oxidation is quantified and a new simplified ignition model is developed.

Thermogravimetry was used to study the oxidation of aluminum powders of various particle sizes and surface morphologies in oxygen at temperatures up to 1500°C. …

Facial Analysis In Video : Detection And Recognition, Peichung Shih

Dissertations

Biometric authentication systems automatically identify or verify individuals using physiological (e.g., face, fingerprint, hand geometry, retina scan) or behavioral (e.g., speaking pattern, signature, keystroke dynamics) characteristics. Among these biometrics, facial patterns have the major advantage of being the least intrusive. Automatic face recognition systems thus have great potential in a wide spectrum of application areas. Focusing on facial analysis, this dissertation presents a face detection method and numerous feature extraction methods for face recognition.

Concerning face detection, a video-based frontal face detection method has been developed using motion analysis and color information to derive field of interests, and distribution-based distance …

Enhancing Web Marketing By Using Ontology, Xuan Zhou

Dissertations

The existence of the Web has a major impact on people's life styles. Online shopping, online banking, email, instant messenger services, search engines and bulletin boards have gradually become parts of our daily life. All kinds of information can be found on the Web. Web marketing is one of the ways to make use of online information. By extracting demographic information and interest information from the Web, marketing knowledge can be augmented by applying data mining algorithms. Therefore, this knowledge which connects customers to products can be used for marketing purposes and for targeting existing and potential customers. The Web …

Synthesis And Characterization Of Mechanically Alloyed Aluminum-Based Compounds As High Energy Density Materials, Xiaoying Zhu

Dissertations

A new type of metastable reactive powders for potential use as high energy density materials in propellants, explosives, and pyrotechnics was developed. These powders are intended to replace aluminum typically added to energetic formulations to increase reaction enthalpy and temperature. The new materials are metastable aluminum-based alloys, which enable achievement of substantially reduced ignition temperatures and accelerated bulk burn rates compared to aluminum. Titanium and lithium were used as alloying components. The materials properties and characteristics leading to their enhanced combustion performance were investigated. The powders were prepared using mechanical alloying and characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy …

Structural Auditing Methodologies For Controlled Terminologies, Hua Min

Dissertations

Several auditing methodologies for large controlled terminologies are developed. These are applied to the Unified Medical Language System XXXX and the National Cancer Institute Thesaurus (NCIT). Structural auditing methodologies are based on the structural aspects such as IS-A hierarchy relationships groups of concepts assigned to semantic types and groups of relationships defined for concepts. Structurally uniform groups of concepts tend to be semantically uniform. Structural auditing methodologies focus on concepts with unlikely or rare configuration. These concepts have a high likelihood for errors.

One of the methodologies is based on comparing hierarchical relationships between the META and SN, two major …

Cross-Layer Design For Wireless Sensor Relay Networks, Lichuan Liu

Dissertations

In recent years, the idea of wireless sensor networks has gathered a great deal of attention. A distributed wireless sensor network may have hundreds of small sensor nodes. Each individual sensor contains both processing and communication elements and is designed in some degree to monitor the environmental events specified by the end user of the network. Information about the environment is gathered by sensors and delivered to a remote collector.

This research conducts an investigation with respect to the energy efficiency and the cross-layer design in wireless sensor networks. Motivated by the multipath utilization and transmit diversity capability of space-time …

Medium Access Control Design For All-Ip And Ad Hoc Wireless Network, Zaihan Jiang

Dissertations

Medium Access Control (MAC) protocol in a wireless network controls the access of wireless medium by mobile terminals, in order to achieve its fair and efficient sharing. It plays an important role in resource management and QoS support for applications. All-IP wireless WAN is fully IP protocol-based and it is a strong candidate beyond 3G (Third Generation Wireless Network). Ad hoc wireless network has recently been the topic of extensive research due to its ability to work properly without fixed infrastructure.

This dissertation is composed of two main parts. The first part pursues a Prioritized Parallel Transmission MAC (PPTM) design …

Development Decision-Making In St. Louis: Institutions, Incentives And Urban Development, William Ernst Winter

Dissertations

This study uses the example of St. Louis to identify how local leaders make decisions about development and what factors influence the type of projects chosen. Through an analysis of projects conducted in the downtown and two distressed neighborhoods, the study concludes that St. Louis has a system of development decision-making that is substantially privatized and decentralized. At the center of development activity are place-based entrepreneurs who understand the local market and work to change the incentive structure for reinvestment. The leadership of the private sector in planning and implementing development policy is the flipside of local institutions that are …

Evolutionary Epidemiology Of Endemic Gal¿Pagos Birds And Their Parasites, Noah Kerness Whiteman

Dissertations

In order to better understand parasite diversification, I went to the Gal¿pagos Islands to study the ecology and evolution of a model bird-parasite system, which included four phylogenetically independent ectoparasite lineages infecting the Gal¿pagos Hawk (Aves: Buteo galapagoensis). The parasites comprised two lice (Insecta: Phthiraptera: Amblycera, Ischnocera), a lousefly (Diptera: Hippoboscidae) and an avian skin mite (Acari: Epidermoptidae). Ultimately, my goal was to examine ectoparasite evolutionary epidemiology and disease susceptibility in relation to the host¿s ecological and colonization history. At the outset, I hypothesized that parasite natural history was key in influencing the coalescent process. Accordingly, I found differences …

Self-Deception And Other-Deception In Personality Assessment: Detection And Implications, Mary Lynn Starke

Dissertations

The present study utilized multiple methods of detecting self-deception and other-deception and explored potential implications for organizations hiring individuals exhibiting these tendencies. Participants were 242 undergraduate business students who completed self-ratings of extraversion and agreeableness under both ¿answer honestly¿ instructions and ¿answer as if you are applying for a job¿ instructions. Additionally, they completed the impression management and self-deceptive enhancement scales of the BIDR, the fake good scale and the good impression scale of the CPI, and took part in a role play with a trained observer. Individuals who knew the participants well provided ratings of participants¿ adjustment, integrity, interpersonal …

Assessing The Impact Of Ethical Training On Law Enforcement Personnel, Tina L. Lee

Dissertations

The purpose of this study was to investigate the opinions of police officers in regards to satisfaction with ethics training. The participants in this study were police officers in city/municipal and county law enforcement agencies. Ethics training is very important in the field o f law enforcement because of the many temptations that officers face and the tremendous amount of authority that society gives to the police. In order to investigate officer’s satisfaction with ethics training, the Ethics Training Questionnaire (ETQ) was developed. This questionnaire contained two parts. The first part was completed by police administrators, and the second part …

Afterschool Intervention Programs’ Impact Upon Select Variables Among 10th Grade Students In The Education Longitudinal Stu D Y (Els) 2002 Dataset, Diane Jackson-Chapman

Dissertations

This researcher analyzed data from the database of the National Center for Educational Statistics: Education Longitudinal Studies (ELS) 2002. The study included responses from 743 principals in 752 schools and from 15,362 10th grade students from public, Catholic, and other private schools. The dissertation investigated if the percentage of school participation in afterschool/summer outreach programs could predict students’ perceptions of teachers, drug availability on campus, student misbehaviors and punishments, and attitudes toward school and grades. The independent variable was the percentage of students in afterschool/summer outreach programs as reported by principals. The dependent variables related to students’ responses to attitudes …

Gender Influences In The Graduate Classroom: An Investigation Of Female And Male Student Perceptions, Gerald B. Blanton Edd

Dissertations

Defined by Mary Rowe (1977) as micro inequities, seemingly insignificant gender bias behaviors create an inequitable academic environment and marginalize groups and individuals in the American classroom. Popularized by Hall and Sandler's 1982 report on the "chilly" classroom, gender bias is subtle and differs from the more obvious behaviors associated with sexual harassment. However, gender bias research appears incomplete. Study findings contradict each other, few studies explore gender bias in the graduate classroom, and fewer yet compare the perceptions of women and men concerning gender influences in the graduate classroom. This dissertation investigates perceptions of the influence of gender in …

A Conductor’S Guide To Wind Instrument Deficiencies: A Practical Addendum To The Undergraduate Conducting Text, Donald Bradley Snow

Dissertations

commonly used undergraduate conducting texts that teach the correction of wind intonation deficiencies. Research has indicated that conductors must be aware of and be trained to recognize and correct intonation deficiencies of wind instruments. Music teachers must understand acoustical differences among just, Pythagorean, and tempered tuning systems. Nonetheless, existing pedagogical materials for undergraduate conductors in training are of little or no help. The supplemental text addresses intonation deficiencies and provides musical examples and exercises to help the young conductor gain an understanding of the factors that adversely affect the intonation of wind instruments. The body of literature on the subject …

Exercise Self-Efficacy, Stages Of Exercise Change, Health Promotion Behaviors, And Physical Activity In Postmenopausal Hispanic Women, Pamela Wolfe Kohlbry Phd

Dissertations

The purpose of this correlational research is to understand the relationships among the variables of exercise self-efficacy, stages of exercise change, health promotion behaviors, body mass index (BMI), health problems, and the level of physical activity in postmenopausal Hispanic women. The significance of this study is to contribute research that enhances the understanding of the relationship of psychosocial and health promotion correlates and physical activity in postmenopausal Hispanic women. On a national level, this is important because Hispanic women make up one of the fastest growing minority populations and they experience the second highest level of obesity. This research is …

Creativity Fostering Behaviors In The Nurse Educator, Barbara Neher Taylor Phd

Dissertations

The purpose of this descriptive study of 93 BSN nurse educators in the State of California was to examine the relationship between creativity fostering behaviors in the nurse educator and intrinsic motivation, creativity fostering behaviors and the teaching/learning goals, and creativity fostering behaviors and class size, number of years teaching, and university type. This sample included 93 participants, 93% were female, Caucasian (91%), with a mean age of 53 and worked in a public university (65%). Medical/surgical was the most common clinical specialty (26%), with a mean of 29.15 years in nursing practice, and 15 years as a nurse educator. …

The Effects Of Participating In Youth Theater, Mark Plato Arapostathis Edd

Dissertations

The purpose of this study is to explore the effects of student participation in youth theater on the students. Research suggests that theater arts have aided in building student cognition and contributed to the development of literacy. Davenport (1999) concluded that the experience and knowledge that one gains from theater arts form the basic building blocks for the skills needed to learn and to become literate. He added that creative expression is the actual production of a work of art, and this direct, personal involvement provides the experience base upon which cognitive development occurs. This cognitive development has practical application …

So You Think It's Inclusion…Think Again: A Quantitative Analysis Of Stakeholder Perceptions In Community Youth Organizations, Mary Mcallister Shea Edd

Dissertations

Over the last thirty years, a cultural transformation has occurred in public schools as students with disabilities have slowly moved from segregated sites and special day classes to more inclusive classroom environments. Although this change has largely been driven by legislative mandate, including the requirement that students be supported in the least restrictive environment possible, the benefits of inclusion have been exceedingly well documented in the literature. Unfortunately, the inclusiveness seen within schools has not extended to the provision of out-of-school programs, and as a result, sixteen years after the passage of the Americans with Disabilities Act, children with disabilities …

Changes In Functional Status Of Home Health Cardiac Patients From Admission To Discharge, Mary Rita Mcgoldrick Phd, Mph, Msn, Rn, Anp-Bc

Dissertations

The purpose of this research is to examine the functional status (ADLs and IADLs) in patients with a primary/secondary diagnosis of cardiac disease in the home health setting. The independent variables of dyspnea and service were examined for the effect on discharge functional status while controlling for the effects of age, gender, race, admission functional status, primary and secondary diagnosis. A descriptive correlational, non-experimental study of cardiac patients in an urban home health agency from January 2003 to December 2004 was conducted using data collected through a retrospective chart review. Seventeen areas of OASIS (ADL and IADL) were assessed for …

Considering The Rationality Of African Ritual Behavior, Joel Grant Mort

Dissertations

The traditional social scientific method undervalues the role that cognitive processes play in human behavior and instead focuses on posited external causal forces, the most common of which is 'culture.' Normative models of rationality, on the other hand, often do suggest and emphasize cognitive reasoning strategies. What is lacking is a familiarity and understanding of what human beings actually do which is, ironically, something social scientists do know something about. Both assume a sort of rational normative baseline cognitive structure and then try to discover those circumstances in which this structure is compromised by the culture, the environment, learning, and …

Effects Of Single Versus Multiple Verbal Operant Arrangements On The Acquisition Of Mands And Tacts In Preschool Children, Tina M. Sidener

Dissertations

Verbal Behavior programs for children diagnosed with autism typically teach novel language in the context of multiple verbal operant arrangements. Commonly called "mixed verbal behavior", this involves the interspersal of various exemplars across verbal operant categories. Despite the current recommended use of this teaching procedure, only 2 studies to date have empirically evaluated its effectiveness (i.e., Arntzen & Almas, 2001; Carroll & Hesse, 1987). In both of these studies, mixed mand-tact training resulted in faster mean acquisition of tacts than tact-only training. In Experiment 1 of the current investigation, a systematic replication of previous studies was conducted with 3 typically-developing …