This thesis is an experimental study of the fluidization of binary mixture in particulate flows. A fluidized bed with two distributors was built with water being used as carrying fluid. Three types of solid particles of nylon, glass and aluminum of the same size and different densities are used in the experiments. The wall effect on a single particle fluidization, the fluidization of binary mixture of large density difference (nylon and aluminum of density ratio of 0.42), and the fluidization of binary mixture of close density (glass and aluminum with density ratio of 0.91) were investigated. Also, the effect of distributors on mono-disperse and bi-disperse particle fluidization was investigated. Results show that the presence of narrow walls reduces the minimum fluidization velocity for a single particle by as much as nearly 40%. Also, in the case of binary mixture of close density particles, uniform mixing was easily achieved and no segregation was observed, but in the case of large density difference particles, there exists significant segregation and separation. At high velocity, the uniform distributor behaves like a transport bed. To achieve a full bed in the single jet, it requires 1.5 times velocity of the uniform distributor. This behavior determines …

Interest in a multiracial society has increased in recent years and including on racism and prejudice and in the propensity to stereotype out-groups. Theories on racism help explain the dominant group's prejudice toward subordinate groups. Yet they only explain why dominant group members stereotype subordinates or if the dominant group's propensity to stereotype is different from that of subordinate groups. Recent assimilation theories suggest that some minorities are assimilating with Whites but Blacks are not undergoing assimilation. Classic assimilation theory suggests that when a subordinate group assimilates with the dominant group then they will also take on the dominant group's values and beliefs, including their prejudices and propensities to stereotype. The use of racial stereotypes in support of the assimilation of a minority group has not been tested. Results from the LSAF national survey provide support for Asians to be assimilating with Whites. However, Hispanics do not appear to be taking on Whites' propensity to stereotype, contradicting the prediction that Hispanics are assimilating with Whites.

The purpose of this study was to determine the relationship between using computer-assisted instruction (CAI) and success on the Texas Assessment of Knowledge and Skills (TAKS) mathematics exam with fifth-grade students in Texas compared to the effect of alternative improvement approaches used by a control group. Research explored the use of SuccessMaker® CAI educational software (Pearson Education, Upper Saddle River, NJ, www.pearsoned.com) in public elementary schools in Texas. Successmaker® CAI was not a good predictor of passing percentage on the mathematics TAKS. Multiple regression analysis utilized in this quasi-experimental design study predicted a negative and not statistically significant change in the percentage of students passing the mathematics TAKS exam (B = -.448, p > .05). SuccessMaker® use exhibited a very small effect size (r = -.04) and accounted for less than 1% of the change in passing percentage (r2 = .0016). Multiple regression model predicted a negative and statistically significant effect upon mathematics passing percentage by economic disadvantage percentage (B = -.211, p < .01). The 95% confidence interval for B ranged from -.365 to -.057. The large effect size correlation coefficient (r = -.51) accounted for 26% of the variance in the mathematics TAKS passing percentage (r2 = .26).

The purpose of this study was to determine whether publicly disclosed violations by U.S corporations, resulting in convictions or settlements, erode shareholder investment in the offending organizations. This study was designed to assess whether or not the shareholders' reactions to corporations' violations were related to a decline in organizations' stock valuations across sectors. In addition, this study attempted to assess whether or not shareholder support, expressed by stock prices, declined more after a corporation was prosecuted or reached a settlement for violations, as compared to corporations that disclosed earnings disappointments. Also, this study investigated the stock prices of violating corporations compared to the non-offending corporations from within the same business sector, as well as considered the percentage decline for repeat offenders for violation two compared to violation one. Opposite to hypothesis, results showed that stock prices for the violating companies were significantly greater 12 months after the violation compared to the other months and no significant differences in percent decline between the eight sectors on any of the five decline measures. There were also no differences between violating companies and their matched companies. Companies with a violation had significantly greater stock prices overall than those without a violation.

The purpose of this study was to examine differences and relationships in student definition and background characteristics, help seeking behaviors, academic and environmental variables between and among community college students at a single institution who successfully completed and those who did not complete online courses during a single term. An adapted version of Bean and Metzner's conceptual model of nontraditional student attrition provided the theoretical framework for the study. The results of data analysis revealed statistically significant differences between completers and noncompleters on the basis of definition, gender, ethnicity, experience and prior GPA. Statistically significant relationships were found between definition, ethnicity, gender, experience, prior GPA, orientation and completion and noncompletion. No statistically significant interactions were found between definition and experience and help seeking behaviors. No statistically significant differences, relationships or predictor variables were found by degree seeking, preassessment, or technical help seeking. Additional analyses by defining characteristics revealed statistically significant differences between completers and noncompleters on the basis of residency, age and enrollment status. Predictor variables found to be significant were definition, gender, experience, prior GPA and orientation. The odds of completion increased with nontraditional definition, female gender, higher prior GPA, and orientation participation. The odds of completion decreased with …

The occurrence of custodial grandparents is increasing greatly. These grandparents face added stress and many adversities that arise from caregiving. Findings of current research tends to be mixed on the effects of grandparents raising grandchildren experience. Much research concludes that grandparent caregivers experience negative declines in overall health and well-being, while other research points out that the caregiving role may actually be a positive experience for the grandparent. The current study hypothesizes that mixed research may be a result of varying levels of resilience in the custodial grandparent population. The model proposed in this study looks at resilience as a mediator between several variables that effect custodial grandparenting. The current sample consisted of 239 custodial grandparents. A regression/correlation analysis was conducted on the data, and it was found that resilience levels were significant in mediating the effects of grandparent caregiving.

Previous research indicates that survivors of sexual assault often blame themselves for the assault. Research has also shown that people blame the perpetrator in some situations and the survivor in other situations involving sexual assault. The purpose of this study was to discover if survivors of sexual assault who blame themselves tend to blame other survivors (survivor blame) in situations different from their own. Another purpose was to assess whether or not sexual assault survivors who do not blame themselves for their attack tend to blame other survivors. The participants' attributional style was also assessed in order to understand the relations between self-blame and survivor blame in situations involving sexual assault. Findings indicated that certain types of attributional style are related to self-blame in sexual assault survivors and blame toward sexual assault survivors depicted in vignettes. This indicates that attributional style may have important implications in the clinical setting to aid sexual assault survivors who experience self-blame, as well in educating society about sexual assault and the ultimate responsibility of perpetrators.

Expanding on prior research into the state level causes of terrorism, I argue that state repression and limited state capacity reduces opportunities for non-violent political expression and increases the utility of terrorism. I also argue that economic freedom can is a form of political expression that can dissipate political grievances. While previous authors analyzed some of these variables separately using data on transnational attacks, I created a complete model incorporating the three categories of variables and tested my hypotheses using data that includes both domestic and transnational attacks. I use regression analysis for hypothesis testing and find support for the three primary contentions of this thesis and conclude that limits on political expression increase the likelihood nations will experienced increased levels of terrorism.

In this thesis, I survey 11 approximation algorithms for unweighted set cover problem. I have also implemented the three algorithms and created a software library that stores the code I have written. The algorithms I survey are: 1. Johnson's standard greedy; 2. f-frequency greedy; 3. Goldsmidt, Hochbaum and Yu's modified greedy; 4. Halldorsson's local optimization; 5. Dur and Furer semi local optimization; 6. Asaf Levin's improvement to Dur and Furer; 7. Simple rounding; 8. Randomized rounding; 9. LP duality; 10. Primal-dual schema; and 11. Network flow technique. Most of the algorithms surveyed are refinements of standard greedy algorithm.

Substitution of the 1,5-cyclooctadiene (cod) ligand in PtCl2(cod) (1) by the diphosphine ligand 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd) yields PtCl2(bpcd) (2). Knoevenagel condensation of 2 with 9-anthracenecarboxaldehyde leads to the functionalization of the bpcd ligand and formation of the corresponding 2-(9-anthracenylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (abpcd) substituted compound PtCl2(abpcd) (3), which is also obtained from the direct reaction of 1 with the abpcd ligand in near quantitative yield. The reaction of 3 with disodium maleonitriledithiolate (Na2mnt) affords the chelating dithiolate compound Pt(mnt)(abpcd) (4). The reaction of PtCl2(bpcd) (2) with 4-methyl-1,2-benzene dithiol under basic conditions affords Pt(tdt)(bpcd) (5). Compounds 2-5 have been fully characterized in solution by IR and NMR spectroscopies (1H and 31P), and their molecular structures established by X-ray crystallography. The electrochemical properties of 2&#8209;5 have examined by cyclic voltammetry, and the nature of the HOMO and LUMO levels in systems 2-4 has been established by MO calculations at the extended Hückel level, the results of which are discussed with respect to electrochemical data and related diphosphine derivatives. In addition the new compounds 2-5 have been isolated by column chromatography and characterized by IR, UV-Vis spectroscopy.

The purpose of this study was to investigate the effect of a professional development intervention conducted with mainstream middle school teachers of English language learners (ELLs) in a North Texas school district. Teacher change was examined in the context of this intervention. Three groups of teachers participated in this study. Group 1 (n= 4) consisted of teachers returning to the intervention for a second year. Group 2 (n= 12) consisted of teachers new to the intervention. Group 3 (n = 16) served as the control group and consisted of teachers who were not part of the intervention. Mixed methods were utilized, including a self-assessment questionnaire, an observation tool, and data from the Texas Assessment of Knowledge and Skills (TAKS) test. Statistically significant differences were found between teachers in Group 1 and teachers in Group 2 in the perception of self-efficacy. Statistically significant differences were also found for Group 1 and Group 2 teachers between the beginning and the end of the year. Group 3 teachers experienced a decrease in their perception of self-efficacy between the beginning and the end of the year. A statistically significant difference in the use of interaction was found across time for teachers in Group 1 …

Certain sport environments may contribute to the development of disordered eating and those that heavily emphasize weight and/or body shape can be particularly damaging to an athlete's body image, self-concept, and eating behaviors. In particular, female athletes in collegiate sports are at a greater risk for engaging in unhealthy behaviors because they face both societal pressures from Western culture to be thin, in addition to sport pressures that focus on performance and appearance. According to the American Medical Association almost half of American women are trying to lose weight, illustrating that societal pressures alone to be thin and attractive can influence the development of disordered eating. Athletes are exposed to the same sociocultural pressures as their nonathlete counterparts, and would be expected to have similar feelings about their bodies as women in general. Add subsequent pressures like team "weigh-ins," coaches' body comp preferences, judges' critiques, revealing attire, and endurance/strength demands, and the stage is set for the development of disordered eating. In the current study, participants were 414 Division-I female gymnasts, swimmers/divers, and they completed self-report measures assessing sport pressures, body satisfaction and disordered eating behavior to test Petrie & Greenleaf's etiological model. Results indicate that sport pressures do lead …

The development of a "cradle-to-cradle" mindset with both material performance during utilization and end of life disposal is a critical need for both ecological and economic considerations. The main limitation to the use of the biopolymers is their mechanical properties. Reinforcements are therefore a good alternative but disposal concerns then arise. Thus the objective of this dissertation is to investigate a biopolymer nanocomposite where the filler is a synthetically prepared layer double hydroxide (inorganic interface); and a biopolymer paper (organic interface) based coating or laminate. The underlying issues driving performance are the packing density of the biopolymer and the interaction with the reinforcement. Since the polyhydroxyalkanoates or PHAs (the biopolymers used for the manufacture of the nanocomposites and coatings) are semicrystalline materials, the glass transition was investigated using dynamic mechanical analysis (DMA) and dielectric spectroscopy (DES), whereas the melt crystallization, cold crystallization and melting points were investigated using differential scanning calorimetry (DSC). Fourier transform infrared (FTIR) spectroscopy was used to estimate crystallinity in the coated material given the low thermal mass of the PHA in the PHA coating. The significant enhancement of the crystallization rate in the PHA nanocomposite was probed using DSC and polarized optical microscopy (POM) and analyzed …

True Selves: Narrative Distance in Stories of Fiction and Nonfiction consists of a scholarly preface and four creative works. The preface discusses narrative distance as used in both fiction and nonfiction, and as compares to other narrative agents such as point of view, especially in contemporary creative writing. The selection of stories examines relationships, especially familial, and themes of isolation, community, and memory. Collection includes two chapters of a novel-in-progress, Fences, short fiction story "Trees and Furniture," and creative nonfiction essays, "Floating" and "On the Sparrow."

The December 2004 Indian Ocean Tsunami wrecked thousands of lives, homes, and livelihoods - losses that could have been avoided with timely and better information. A resource such as information is needed at a fundamental level much like water, food, medicine, or shelter. This dissertation examines the development of the Thai information society, in terms of the share of information workforce and the level of diffusion of information and communication technologies (ICT), as well as, the role of the Thai information society in response to the tsunami disaster. The study combined the historical and political economy analyses in explaining factors influencing the growth of information workforce and the development of ICT in Thailand. Interviews conducted in 2007-08 revealed the Thai information society responded to the 2004 Tsunami - the first global internet-mediated natural disaster - in two areas: on-site assistance in collecting and recording identification information of tsunami disaster victims and on-line dissemination of disaster relief information. The effectiveness of ICT institutions in providing the tsunami disaster relief efforts and increasing the development of the information society were assessed using statistical procedures analyzing the perceptions of the Internet-based survey respondents. The disaster effects on survey respondents were also assessed. The …

A shift is occurring in environmentalism to a post-metaphysical understanding of the human relationship to nature. Stemming from developments within the wilderness debate, ecofeminism, and eco-phenomenology, the old dichotomy between John Muir's tradition of privileging nature and Gifford Pinchot's tradition of privileging society is giving way to a relational paradigm that privileges neither. The starting point for this involves articulating the ontology of relationship anew. Insofar as the dominant metaphors of nature and their complimentary narratives present a choice between the agency of the human or the natural worlds, they encourage one-sided or "reactive" relationships to the world. By contrast, developments sensitive to the mutual agency between them encourage "responsive" relationships. The relational metaphors of "partnership" (Merchant) and "dialogue" (Plumwood) are prominent examples. The idea of "nonhuman agency," however, is counter-intuitive and problematic. The works of Buber, Heidegger, and Merleau-Ponty suggest a model of "mutual response" rather than "mutual agency."

Although governments try to create strict policies and regulations to prevent abuses, use of excessive force is still a problem for almost every country including Turkey. This study is intended to help Turkish National Police administrators to understand and prevent police use of excessive force. Studies on police brutality categorize three factors that explain why police officers use excessive force; these are individual, situational and organizational. In addition to brutality theories, job satisfaction literature is examined in this study to understand the use of excessive force. Job satisfaction is found to be related with burnout, turnover, stress, commitment, and performance. The impact of officers' attitude toward the criminal justice system and/or laws has not been tested widely. Police officers attitudes toward human rights laws are examined in this study to measure its impact on attitude toward use of excessive force. A secondary data collected in Turkey are analyzed by structural equation modeling which provides confirmatory factor analysis, path analysis, and causal relationships between variables. It is found that police officers' attitude toward human rights laws is a significant predictor of their attitudes toward use of excessive force. Job satisfaction and education level are the other significant variables affecting attitude toward …

Many calamities in history like hurricanes, tornado and flooding are proof to the large scale impact they cause to the life and economy. Computer simulation and GIS helps in modeling a real world scenario, which assists in evacuation planning, damage assessment, assistance and reconstruction. For achieving computer simulation and modeling there is a need for accurate classification of ground objects. One of the most significant aspects of this research is that it achieves improved classification for regions within which light detection and ranging (LiDAR) has low spatial resolution. This thesis describes a method for accurate classification of bare ground, water body, roads, vegetation, and structures using LiDAR data and aerial Infrared imagery. The most basic step for any terrain modeling application is filtering which is classification of ground and non-ground points. We present an integrated systematic method that makes classification of terrain and non-terrain points effective. Our filtering method uses the geometric feature of the triangle meshes created from LiDAR samples and calculate the confidence for every point. Geometric homogenous blocks and confidence are derived from TIN model and gridded LiDAR samples. The results from two representations are used in a classifier to determine if the block belongs ground or …

This dissertation describes WikiRank, an unsupervised method of assigning relative values to elements of a broad coverage encyclopedic information source in order to identify those entries that may be relevant to a given piece of text. The valuation given to an entry is based not on textual similarity but instead on the links that associate entries, and an estimation of the expected frequency of visitation that would be given to each entry based on those associations in context. This estimation of relative frequency of visitation is embodied in modifications to the random walk interpretation of the PageRank algorithm. WikiRank is an effective algorithm to support natural language processing applications. It is shown to exceed the performance of previous machine learning algorithms for the task of automatic topic identification, providing results comparable to that of human annotators. Second, WikiRank is found useful for the task of recognizing text-based paraphrases on a semantic level, by comparing the distribution of attention generated by two pieces of text using the encyclopedic resource as a common reference. Finally, WikiRank is shown to have the ability to use its base of encyclopedic knowledge to recognize terms from different ontologies as describing the same thing, and thus …

This study investigated if girls and boys high in ADHD symptomology exhibited and experienced relational and overt aggression differently than boys and girls without ADHD symptoms using peer, parent and teacher ratings. A measurement of social behavior for parent ratings was also validated. Using archival data, 371 3rd- 6th graders from a north Texas school district participated in the study, along with a parent or guardian and teachers. Results supported that ADHD subtype predicted more overt aggression according to parents and teachers but not peers. ADHD subtype did not predict more relational aggression but ADHD symptomology did. Contrary to past research, gender did not moderate relational aggression or internalizing symptoms from relational victimization. Furthermore, a parent version of the Child Social Behavior Scale was found to effectively measure relational, overt and prosocial behavior. Limitations, future directions and implications are discussed.

Wetting of a substance has been widely investigated since it has many applications to many different fields. Wetting principles can be applied to better select cleans for front end of line (FEOL) and back end of line (BEOL) cleaning processes. These principles can also be used to help determine processes that best repel water from a semiconductor device. It is known that the value of the dielectric constant in an insulator increases when water is absorbed. These contact angle experiments will determine which processes can eliminate water absorption. Wetting is measured by the contact angle between a solid and a liquid. It is known that roughness plays a crucial role on the wetting of a substance. Different surface groups also affect the wetting of a surface. In this work, it was investigated how wetting was affected by different solid surfaces with different chemistries and different roughness. Four different materials were used: silicon; thermally grown silicon dioxide on silicon; chemically vapor deposited (CVD) silicon dioxide on silicon made from tetraethyl orthosilicate (TEOS); and organosilicate glass (OSG) on silicon. The contact angle of each of the samples was measured using a goniometer. The roughness of the samples was measured by atomic force …

This thesis is a comparative analysis of Ibn Taymiyya of Damascus and Gregory of Rimini within their respective religious and philosophical traditions. Ibn Taymiyya and Gregory of Rimini rejected the use of Aristotelian logic in the valorization of divine revelation in Islam and Christianity respectively. The translation movements, in Baghdad and then in Toledo, ensured the transmission of Greek scientific and philosophical works to both the Islamic world during the 'Abbasid Caliphate and the Catholic Christian European milieu beginning in the eleventh century. By the fourteenth century both the Islamic and the Catholic European religious traditions had a long history of assimilating Aristotle's Organon. Ibn Taymiyya and Gregory of Rimini rejected the notion, adopted by the kalam and scholastic traditions respectively, that logical demonstration could be used to validate religious doctrine as taught in the Qur'an and the Bible. Ibn Taymiyya rejected demonstration completely but Gregory accepted its qualified use.

Users in social networking sites, such as Facebook, are increasingly receiving friend requests from strangers and accepting strangers as friends. The purpose of this study was to examine the effects of the Big Five personality traits and strangers' gender in affecting Facebook users' decisions to accept the stranger's friend request by adopting a 2 (gender of the stranger: male vs. female) x 5 (stranger's personality: Neuroticism vs. Extraversion vs. Openness vs. Conscientiousness vs. Agreeableness) factorial design. Results revealed that participants were more likely to accept the stranger's friend request when the participant's and stranger's personalities matched. This effect was more pronounced when the stranger was a female. Participants accepted female stranger's friend request due to the inflated perception of stereotypical female characteristics, which supported the hyperpersonal effect. Majority of the participants accepted the stranger's friend request based on textual cues that were displayed in the friend request message, which supported social information processing theory, suggesting that impression formation of the stranger was not constrained to the lack of nonverbal cues setting.