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The Impact Of Sexual Abuse And How Children Cope: Different Perspectives From Caretakers And Children, Megan M. Schacht

Dissertations

Child sexual abuse is a complicated stressor with a broad range of associated symptoms. It has been suggested that the coping techniques children utilize may act as a mediating variable in the relationship between child sexual abuse and subsequent difficulties. Until recently, child sexual abuse sequelae were assessed in a piecemeal fashion, with individual tests for each symptom domain and reporter. However, recent developments in the area of trauma assessment have provided researchers with complementary caretaker- and self-report measures to assess a broad range of trauma-related symptoms (i.e., the Trauma Symptom Checklist for Young Children [TSCYC] and the Trauma Symptom …

Is Rumination General Or Specific To Negative Mood States? The Relationship Between Rumination And Distraction And Depressed, Anxious, And Angry Moods In Women, Jessica Lauren

Dissertations

Rumination has been found to play a role in negative affect by either maintaining or increasing depressive, anxious, and angry moods, whereas distraction has been found to decrease these negative moods. This experiment tested the hypothesis that the effect of rumination occurs across mood states and is not specific to one type of negative mood, using both Nolen-Hoeksema¿s Response Styles Theory (RST; 1991), and Bower¿s Associative Network Theory (1981; ANT). The impact of rumination and distraction on depressed, anxious, and angry mood states were examined in 90 women at the University of Missouri ¿ St. Louis. Participants were randomly placed …

“A Highly Ambiguous Condition”: The Transgender Subject, Experimental Narrative And Trans-Reading Identity In The Fiction Of Virginia Woolf, Angela Carter, And Jeanette Winterson, Jennifer A. Smith

Dissertations

This dissertation examines how the constantly evolving gender identity o f a text’s transgender subject relates to the text’s narrative structure and shapes the orientation o f the reader to the text. Accordingly, this project examines how these transgender narratives deploy experimental stylistic techniques that enhance the reader’s experience of ceaseless transitioning by revealing gender as a constant process that never solidifies onto a body and by highlighting the text’s own status as process rather than finalized product. Further, this project examines how a transgender subject and his/her relationship to the body, culture, and narrative is involved in the re-vision …

Exposure Of Nervous System Cells To Polychlorinated Biphenyls (Pcbs), Results In Alterations Of Neurotrophic Factor Expression, Gordon H. Gurley

Dissertations

Toxic insult by PCBs results in learning and memory deficits in humans. Alterations in expression of neurotrophic factors (NF) and/or their receptors have been linked to changes in learning and memory. How PCBs affect cognition is not known. We suggest that PCBs affect cognition by altering NF expression.

We exposed cultured C6 rat glioblastoma cells (an astrocyte cell-line) to medium containing PCB (Aroclor 1254 (10ppm)). Control cells were treated with dimethyl sulfoxide (DMSO) or regular medium. Enzyme-linked immunosorbent assays (ELISA) were used to determine glial cell-line derived neurotrophic factor(GDNF) and nerve growth factor (NGF) concentrations in all samples. We also …

Molecular Analysis Of The Effects Of Atrazine On Xenopus Laevis Frogs, Ronald Edward Celestine

Dissertations

Atrazine, the most commonly used herbicide in the U.S., has been implicated as one of the factors that may be causing the worldwide decline of amphibians. First, I examined effects of atrazine on laboratory raised Xenopus laevis tadpoles, treated from 5 days post fertilization to NF stage 65/66 with a concentrationof 25 ppb of atrazine. This study showed no significant difference in body weight, length and metamorphic rate.

Second, I used DNA microarrays to examine mRNA expression levels of genes in atrazine treated and control Xenopus laevis tadpoles. I found significant changes in gene expression levels of 18 genes. These …

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 …

Linear And Log-Linear Models Based On Generalized Inverse Sampling Scheme, Soumi Lahiri

Dissertations

This dissertation explores the development of novel statistical techniques and the applications in modeling rare events using generalized inverse sampling scheme. The Poisson model can be used for independent frequency count data. Also negative binomial and negative multinomial (NMn) models are applicable when there is only one rare category in the population. Here, a new model, based on generalized inverse sampling scheme, is introduced to study several rare events simultaneouly. The generalized inverse sampling scheme is used to study several rare categories of a population. Samples are drawn until a predetermined number of the total of the rare events occur. …

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 …

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 …

Interactions Of Ionic Liquids With Uranium And Its Implications On Biotransformation, Chengdong Zhang

Dissertations

Room temperature ionic liquids (ILs) are pure ionic compounds with melting points below 100°C, which have drawn great attention due to their many unique properties. They have been widely used in organic synthesis, analytical chemistry, and biochemistry. Although ionic liquids have been used to extract metals and radionuclides, there is no systematic study on the interactions of ILs with uranium and their effects on the biotransformation of uranium.

My research focused on: (1) the interactions between uranium and ionic liquids in aqueous solution; and (2) biotransformation of uranium in the presence of ILs. The interactions between three representative ionic liquids, …

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 …

Gas Chromatography On Self Assembled Single Walled Carbon Nanotubes, Mahesh Kumar Karwa

Dissertations

Carbon nanotubes (CNTs) are nano-sized carbon-based sorbents, which have high surface area, large aspect ratio, can be self-assembled and are known to be stable at high temperatures. It is therefore conceivable that separation techniques, such as, gas chromatography (GC) can benefit from their unique properties and nano-scale interactions. Self-assembly, in-contrast to packing these materials in a tube, prevents them from agglomeration and thus facilitates in retaining their nano-characteristics. In this research, novel substrates, such as, steel tubings, on a scaled-up level have been explored for the self-assembly process of CNTs, for applications such as gas chromatography, where the CNTs served …

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 …

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 …

Resilience And Quality Of Life In Taiwanese Survivors Of Childhood Cancer, Li-Na Chou Phd, Msn, Rn

Dissertations

Survivors of childhood cancer are at risk to develop physiologic-psychosocial complications that affect their quality of life. This study explored how the independent variables of illness-related risk (ILLRK), individual risks (IRK), protective factors (PF) and resilience (RS) affected the dependent variable---quality of life (QOL)--in Taiwanese survivors of childhood cancer. Triangulated research methodology was employed to (1) identify the statistical relationships between the variables and (2) explore qualitatively what these variables meant to the subjects and how their perceptions further explained the statistical results. Haase's (2004) Adolescent Resilience Model was used as the theoretical framework. Ninety-eight Taiwanese adolescent cancer survivors, diagnosed …

The Dilemma Of Disclosure For College Students With Attention Deficit Disorder, Teresa L. Spoulos Edd

Dissertations

Many college campuses are striving to recruit and retain a diverse student population, and one population making its presence known are students with disabilities. As a result of the Rehabilitation Act of 1973 and the Americans with Disabilities Act of 1990, students with disabilities are ensured equal access to education through the removal of architectural barriers and the provision of reasonable accommodations. Despite the existence of these laws, however, many students with attention deficit disorder (ADD) choose not to request classroom accommodations from professors. Students choose not to disclose out of fear of having inaccurate labels placed on them, being …

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 …

Development Of An Instrument To Identify The Virtues Of Expert Nursing Practice: ‘Byrd’S Nurses Ethical Sensitivity Test’ (Byrd’S Nest), Lisa Marie Byrd

Dissertations

The purpose of this research was to develop and analyze the psychometric properties of Byrd’s Nurse’s Ethical Sensitivity Test (Byrd’s NEST). An instrument to evaluate nurses’ ethical sensitivity in practice by examining choices of action in ethical dilemmas based on nursing virtues: compassion, fidelity to trust, moral courage, justice, self-confidence, resilience, practical reasoning, and integrity (Benner, Tanner, & Chelsa, 1996; Volbrecht, 2002). Benner’s theory of skill acquisition-novice to expert was the theoretical framework for this research which surveyed for correlations between a nurse’s ethical sensitivity and educational level, years of experience, certification, and work setting. Until now, there have been …

Olfactory Bulb Neurons Of Adult Zebrafish Morphology, Distribution, Cellular Interactions And Structural Stability Following Deafferentation, Cynthia L. Fuller

Dissertations

The zebrafish is becoming an increasingly popular model for studies involving olfactory function, yet there is still much to be learned about the anatomy and circuitry of different cell types in the olfactory bulb. This study focuses on identifying the morphology and distribution of output neurons and interneurons in the olfactory bulb of adult zebrafish, Danio rerio . Furthermore, this investigation examines the cellular interactions of the primary output neuron, the mitral cell, and addresses the issue of neuronal plasticity by considering the structural stability of this cell type following loss of afferent innervation.

Using retrograde tract tracing with various …

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 …

New Estimators Of A Circular Median, Sauwanit Ratanaruamkarn

Dissertations

The specific properties of probability distributions on a circle require different definitions of several statistical concepts. For example, a median that can always be found for linear data not always exists on the circle. Several estimators of a circular median were proposed, lately by Otieno (2002), Otieno and Anderson - Cook (2003). Their work is, however, focused on the "preferred direction" which coincides with the median, mean and mode in the case of symmetric, unimodal distributions. This dissertation is focused on the estimators of a population median in a wider range of population distributions on a circle including distributions with …

Comparative Genomic Analyses And Expression Of A Set Of Overlapping Open Reading Frames Of Frog Virus 3, Type Species Of Ranavirus (Family Iridoviridae), Wendy Guat Hoon Tan

Dissertations

Frog virus 3 (FV3) is the type species member of the genus Ranavirus (family Iridoviridae ). To better understand the molecular mechanisms involved in the replication of FV3, including transcription of its highly methylated DNA genome, the complete nucleotide sequence of the FV3 genome has been determined. The FV3 genome is 105, 903 base pairs long excluding the terminal redundancy. The G+C content of FV3 genome is 55% and it encodes 98 non-overlappingpotential open reading frames (ORFs) containing 50 to 1293 amino acids. Eighty-four ORFs have significant homology to known proteins of other iridoviruses, whereas 14 are unique FV3 ORFs. …

Synthetic Studies Of 1,10-Phenanthroline Derivatives As Novel Catalysis Ligands And Their Application In Transition Metals Catalyzed Reactions, Son Duc Tran

Dissertations

The preparation of 1,10-phenanthroline derivatives entailed ring opening reactions of 1,10-phenanthroline epoxide as a key transformation, affording novelbidentate nitrogen ligands with new stereogenic centers in the 5- and 6-position. This research was concerned with (i) the epoxidation of 1,10-phen, (ii) epoxide ring opening reactions, (iii) the formation of trans -5,6-disubstituted-1,10-phenanthroline metal complexes, and (iv) application of 1,10-phenanthroline derivatives in metal-catalyze reactions such as palladium-catalyzed allylic substitution and aminohalogenation reactions; Zinc-catalyzed direct aldolreaction, and acetophenone reduction; Nickel-catalyzed Michael addition reaction.

Homeless Mothers' Perceptions Of Parenting In Shelters, Sarah E. Young Whitaker Dnsc, Msn, Rn

Dissertations

Descriptions of parenting in a homeless shelter were obtained from nine single mothers housed in one of two shelters in a major southwestern border metroplex. Case study methodology was used to obtain their perspectives on parenting in this unique context. Content analysis was used to organize and analyze emerging themes. Major themes that emerged from the study were (a) a lack of autonomy, (b) gaining access to material resources, (c) lack of privacy, (d) constant change and insecurity in the environment, (e) differing values, and (e) psychosocial support.

Terrorism And College Students: A Generation's Response To September 11, 2001, Robert Mason Wild

Dissertations

The terrorist attacks on the United States of September 11, 2001 marked a significant cultural turning point for Americans. The tragic destruction of the World Trade Towers , the damage to the Pentagon and the loss of thousands of civilian lives brought an end to the optimism and feelings of security and invulnerability that marked the decade of the 1990s. Students who were enrolled in college at the time of the attacks were affected as well. This qualitative study examines the emotions and attitudes of 50 students enrolled a mid-sized, private research institution on September 11, 2001. The study explores …

Dynamic Simulations Of Particle Suspensions Subjected To An External Electric-Field, Xianjin Jiang

Dissertations

A numerical method is performed to study the suspension of polarizable particles in nonconductive solvents subjected to external electric fields. Such particles experience both hydrodynamic and electrostatic interactions. The hydrodynamic force acting on the particles is determined using the Stokesian dynamics method under the assumption that the Reynolds number is much smaller than 1, while the electrostatic force is determined by differentiating the electrostatic energy of the suspension, which is computed from the induced particle dipoles. In addition, the multiple image method is used to compensate for the electrostatic force when two particles are close to each other. Because the …

Ligand-Based Design Of Dopamine Reuptake Inhibitors : Fuzzy Relational Clustering And 2-D And 3-D Qsar Modleing, Milind Misra

Dissertations

As the three-dimensional structure of the dopamine transporter (DAT) remains undiscovered, any attempt to model the binding of drug-like ligands to this protein must necessarily include strategies that use ligand information. For flexible ligands that bind to the DAT, the identification of the binding conformation becomes an important but challenging task. In the first part of this work, the selection of a few representative structures as putative binding conformations from a large collection of conformations of a flexible GBR 12909 analogue was demonstrated by cluster analysis. Novel structurebased features that can be easily generalized to other molecules were developed and …

The Effects Of Aging On Cardiac Mechanics, Samuel C. Lieber

Dissertations

It is well established that the aging heart exhibits left ventricular (LV) diastolic dysfunction and changes in mechanical properties, which have been attributed to alterations in the extracellular matrix (ECM). The investigators tested the hypothesis that the mechanical properties of cardiac myocytes significantly change with aging thereby contributing to the LV diastolic dysfunction. Cellular mechanical properties were determined by indenting cells with an atomic force microscope (AFM). The indentation results were interpreted by modeling the AFM probe as a blunted cone and determining an apparent elastic modulus (B) with classical infinitesimal strain theory (CIST). A commercially available finite element software …

Design And Resource Management Of Reconfigurable Multiprocessors For Data-Parallel Applications, Xiaofang Wang

Dissertations

FPGA (Field-Programmable Gate Array)-based custom reconfigurable computing machines have established themselves as low-cost and low-risk alternatives to ASIC (Application-Specific Integrated Circuit) implementations and general-purpose microprocessors in accelerating a wide range of computation-intensive applications. Most often they are Application Specific Programmable Circuiits (ASPCs), which are developer programmable instead of user programmable. The major disadvantages of ASPCs are minimal programmability, and significant time and energy overheads caused by required hardware reconfiguration when the problem size outnumbers the available reconfigurable resources; these problems are expected to become more serious with increases in the FPGA chip size. On the other hand, dominant high-performance computing …