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Enriched Vs Impoverished Housing: Food Choice And Consumption, Berenice Martinez
Enriched Vs Impoverished Housing: Food Choice And Consumption, Berenice Martinez
Theses and Dissertations - UTB/UTPA
This study focused on the relationship between environmental setting, eating choices and food intake. Ten Swiss Webster female subjects were socially housed under impoverished environmental conditions and ten under enriched housing conditions. Subjects were exposed to a nutritious food and sweet fat-laden food diet together with ad lib access to regular tap water on a 12 h light and dark cycle for four weeks. Results showed that an impoverished environment does not lead to an increase in body weight (t(6)= 0.293, p > .05) and environmental manipulations do not delineate a preference for diet type (t(6)= .877, p >.05). Further research …
The Study Of The Parasitic Fauna In Sciaenops Ocellatus, Lower Laguna Madre, Texas, Veronica Abrigo
The Study Of The Parasitic Fauna In Sciaenops Ocellatus, Lower Laguna Madre, Texas, Veronica Abrigo
Theses and Dissertations - UTB/UTPA
Parasitological investigations provide information on ecosystem health because parasite prevalence and abundance are influenced by biotic and abiotic environmental changes. This survey classified the parasitic fauna of red drum, Sciaenops ocellatus, in the Lower Laguna Madre, TX. Fish (n = 239) were collected from four study sites (May 2005 - June 2006). Parasite identification consisted of digenean and monogenean trematodes, cestodes, larval nematodes, copepods, and protozoans. Parasite prevalence and host length was positively correlated from South Bay (r=0.473), Port Isabel (r=0.533), Arroyo(r=0.314), and Port Mansfield (r=0.630). Significant differences (p<0.001) between zone and parasite prevalence from Arroyo site indicated a higher prevalence of protozoa and monogeneans and reduced prevalence of digeneans. Statistical analyses indicated the greatest difference between Port Isabel and Arroyo sites ( divided by 2= 48.195; p<0.001; df= 14), and the least difference between South Bay and Arroyo sites ( divided by 2= 20.847; p= 1.06; df= 14).
First Mover: Otto Struve And The Use Of Scientific Capital In Astrophysics, 1921–1950, Erik Paul Norquest
First Mover: Otto Struve And The Use Of Scientific Capital In Astrophysics, 1921–1950, Erik Paul Norquest
Theses and Dissertations - UTB/UTPA
Otto Struve (1897-1963) came to the United States in 1921 and became one of the dominant personalities in the field of astrophysics. Struve’s career made him, in the words of sociologist Pierre Bourdieu, a “first mover” in a scientific field that was firmly engaged in the process of what Thomas Kuhn called “normal science.” Struve pulled astrophysics further away from its empirical roots in categorization and made it more like physics in its unification of theory and observation. The primary way that he accomplished this was through his administration of Yerkes and McDonald observatories, where he brought in theorists to …
And They Were Thirteen, Daniel Sanchez
And They Were Thirteen, Daniel Sanchez
Theses and Dissertations - UTB/UTPA
In the critical introduction to my thesis, I explore how the progression of my creative work straddled the gap between fiction and nonfiction and how, in trying to make the creative work a combination of both, I failed to make it work as successfully as I could have as a narrative. I then segue into my research on Joseph Campbell’s monomyth and how it has even affected narratives focusing on teachers. I then explain how elements present in my work coincide with aspects of the monomyth. Because of the prevalence of the monomyth in American pop culture, I make an …
Subthreshold 3 Phase Mixers, Jesus Angel Torres
Subthreshold 3 Phase Mixers, Jesus Angel Torres
Theses and Dissertations - UTB/UTPA
This thesis will discuss subthreshold FET mixers with a focus on conversion loss derivations. To begin understanding the mixers, a look into the FET model is first taken in Chapter II. Then in Chapter III, a single FET device mixer is studied and its conversion loss is found from its small-signal model. The chapter will then include a two FET device mixer and a four device FET mixer. Finally a new type of mixer will be discussed in Chapter IV. The new type of mixer is a 3 phase mixer with the phase angles being 0°, 120°, and 240°. The …
An Analysis Of The Dynamic Properties Of The American Depositary Receipt Cross Market Premium, Jorge Vidal
An Analysis Of The Dynamic Properties Of The American Depositary Receipt Cross Market Premium, Jorge Vidal
Theses and Dissertations - UTB/UTPA
The American Depositary Receipt (ADR) cross-market premium is studied over a 20 year period. The dynamic properties of the cross-market premium are studied for the first time in a nonlinear smooth error correction framework using a smooth transition error correction model (STECM) and compared against a linear model and two other nonlinear model specifications. The results indicate the ADR cross-market premium is more appropriately estimated when the nonlinearity, smooth transition, and cointegration properties present in the premium are estimated simultaneously with a STECM. The estimates of the STECM indicate arbitrage opportunities in the ADR market are rare and dissipate quickly. …
“Oye: Words Are One Big Mind” A Collection Of Poems, Samuel Arizpe
“Oye: Words Are One Big Mind” A Collection Of Poems, Samuel Arizpe
Theses and Dissertations - UTB/UTPA
Oye: Words Are One Big Mind. A Collection of Poems comprises forty poems arranged into three sections. It is preceded by a critical introduction in which the author discusses: 1) the childhood provenance of his love for language; 2) how his Latino linguistic, religious and cultural roots from South Texas set him on the path of poetic discovery and contextualized his poetic style 3) the influence of early Chican@ poets upon his poetry; 4) commonalities of Latin American poetry in his own work; 5) the convergence of spiritual, social, religious, mystical, and universal issues in his work.
The Mexican Identity And Music: Audioscapes And The Transnational Death Metal Band Brujeria, Michael D. Mena
The Mexican Identity And Music: Audioscapes And The Transnational Death Metal Band Brujeria, Michael D. Mena
Theses and Dissertations - UTB/UTPA
The California-based Mexican-American “activist” metal band Brujeria, uses a powerful, yet conflicting, blend of nihilism, anarchism, and racism with a dose of hyper-patriotism in its attempt to convey the voice of oppressed Mexicans on both sides of the border. While it is uncertain whether or not Brujeria is intentionally political, their live performances and song lyrics are highly critical of both the U.S. and Mexico regarding immigration policy, border-crossing, and other issues which have resonated among an international audience. In this paper I explore the conflicting notions of space, performativity, binationality and U.S. Mexico relations within the context of Brujeria …
The Effects Of Physical Activity On Self-Injurious Behavior, Lynnette D. Aguilar
The Effects Of Physical Activity On Self-Injurious Behavior, Lynnette D. Aguilar
Theses and Dissertations - UTB/UTPA
Auto-mutilation is a maladaptive coping mechanism and a major problem confronting behavioral medicine with no known treatment to date to place the behavior on complete extinction. The purpose of this experiment is to examine the possible beneficial effects of running relative to caffeine-induced SIB. Female Sprague Dawley rats (n = 4) served as subjects with each having a different extended baseline and treatment condition. Visual analysis of a multiple baseline graph did not support the hypothesis that as treatment (physical activity) was implemented SIB would decrease. It was found that subjects who drank more caffeinated water had higher amounts of …
Parenting Strategies As Predictors Of Cognitive Development Among Children, Nydia E. Martinez
Parenting Strategies As Predictors Of Cognitive Development Among Children, Nydia E. Martinez
Theses and Dissertations - UTB/UTPA
The present study investigated relationships among parenting strategies, socioeconomic status, and theory of mind development in 88 (43 girls and 45 boys) predominantly Hispanic 3 – to 7-year-old children. Vocabulary and ToM reasoning (via one true and one false belief task) levels were assessed. Parents completed demographic surveys and a disciplinary questionnaire, which presented the parents with hypothetical corrective behavioral situations. Contrary to expectations there were no significant relations between ToM, parenting strategies, and socioeconomic status in the overall sample. However, examining children tested in English and children tested in Spanish separately yielded some significant results. In the Spanish-speaking sample, …
Social Skills As Predictors Of Theory Of Mind Development Among Children, Lucia A. Salinas
Social Skills As Predictors Of Theory Of Mind Development Among Children, Lucia A. Salinas
Theses and Dissertations - UTB/UTPA
The present study examined relationships among social skills including deceptive behavior, socioeconomic status, and theory of mind development in 98 predominantly Hispanic 3- to 7-year-old children residing in the Rio Grande Valley of Texas. Measures were of vocabulary, deceptive ability, true belief, and false belief understanding. Children’s interactions with others were also measured through observational methods and parental data was obtained to compute socioeconomic status and validate social skills information. It was hypothesized that social skill development, including deception would emerge along with theory of mind understanding in this population, and that children from households of lower socioeconomic status would …
The Use Of Debit Cards In Promoting On-Time Payment Behavior In A Daycare Center In The Rio Grande Valley Region Of Texas, Ruben James Nieto
The Use Of Debit Cards In Promoting On-Time Payment Behavior In A Daycare Center In The Rio Grande Valley Region Of Texas, Ruben James Nieto
Theses and Dissertations - UTB/UTPA
The study investigates the inappropriate payment behavior of consumers at a local daycare in the Rio Grande Valley. An AB, baseline and intervention, single subject design was used to increase the on-time payment behavior of consumers paying on time at the daycare. Baseline data was taken for 14 weeks before the intervention was implemented. The intervention consisted of an alternative payment method, accepting credit and debit cards, [as an antecedent, to the consumer in order to receive payments on time]. This alternative payment method showed that on-time payment behavior increased compared to pre-intervention.
An Investigation Into Temperature Trending In Railroad Tapered Roller Bearings Through Vibration Monitoring Techniques, Rafael Kristian Maldonado
An Investigation Into Temperature Trending In Railroad Tapered Roller Bearings Through Vibration Monitoring Techniques, Rafael Kristian Maldonado
Theses and Dissertations - UTB/UTPA
A series of laboratory experiments have been conducted at The University of Texas-Pan American to investigate the cause of bearing “temperature trending.” A combination of theoretical and experimental studies has identified potential sources for the abrupt changes in temperature often seen in railroad bearings. Previous studies suggest the possibility of vibration induced roller misalignment as the root cause for temperature trending. Subsequent research conducted by the UTPA team was designed to provide evidence through vibration monitoring techniques for the proposed hypothesis. To that end, a dynamic bearing tester was used to run four bearings at various speeds and loads experienced …
Does Responding On Progressive Ratio Schedule Of Reinforcement Vary As A Function Of Phase In Estrous Cycle?, Armandina M. Sanchez
Does Responding On Progressive Ratio Schedule Of Reinforcement Vary As A Function Of Phase In Estrous Cycle?, Armandina M. Sanchez
Theses and Dissertations - UTB/UTPA
Hormonal fluctuations across the menstrual and estrous cycle have been found to influence a variety of behavioral and physical responses in humans and animals, respectively. Impulsive behavior has been associated with the luteal phase of the cycle. Progressive ratio schedule of reinforcement has been widely used to assess the strength of reinforcers. In the present study, a comparison was made between the rate of motor activity, lever pressing, of early and late estrous groups. Differences between the groups were not statistically significant. Further analysis explored subjects individually. Visual examination of the data reveal extreme variability in responding, which coupled with …
The Role Of Thermally-Induced Geometrical Changes In Temperature Trending Of Railroad Tapered Roller Bearings, Andrei G. Vaipan
The Role Of Thermally-Induced Geometrical Changes In Temperature Trending Of Railroad Tapered Roller Bearings, Andrei G. Vaipan
Theses and Dissertations - UTB/UTPA
The understanding of the phenomenon of temperature trending of railroad tapered roller bearings is of paramount importance to the railroad industry. The problem that this poses to the industry is that it leads to false alarms triggered by wayside detectors, which forces the premature removal of defect-free bearings. This thesis provides more insight into this phenomenon and answers questions regarding the importance of key tapered roller bearing components geometry and geometrical changes during temperature trending events. In this study, dynamic experiments conducted in the laboratory have represented the primary method of testing bearing temperature trending. The experimental results are brought …
The Evaluation And Analysis Of The Impact Of Variability On The Twelve Workstation Factory, Hernando Garrido
The Evaluation And Analysis Of The Impact Of Variability On The Twelve Workstation Factory, Hernando Garrido
Theses and Dissertations - UTB/UTPA
Presently, there is theory and work examples about factory performance presented in the book ―Optimizing factory Performance‖ by James Ignizio, Ph.D. The theory explains how to determine performance using three fundamental equations by considering the impact and propagation of variability through a 12-Workstation Factory Model, and a number of its variations. The objective of developing a simulation model was to serve as a tool for instructors to illustrate the impact and propagation of variability in the manufacturing industry and to investigate phenomena (i.e., time to reach steady state, impact of variability) in the three dimensions of manufacturing. The validation of …
Analysis And Design Of An Anisotropic, Compliant Suspension Component, Samantha Jean Salinas
Analysis And Design Of An Anisotropic, Compliant Suspension Component, Samantha Jean Salinas
Theses and Dissertations - UTB/UTPA
A steering pad on a train is meant to reduce the force on the wheel while moving along a curve in the rail. A new steering pad was desired with properties tuned for a new suspension system design. An anisotropic, compliant pad was designed for a specific stiffness anisotropy, 20:1. Finite element analysis was performed on various models as a guide to designing a pin with the desired stiffness ratio. A design was chosen for a prototype made of thermoset polyurethane, a similar material to that currently used. Experiments were performed on the prototype pad model to determine vertical and …
Characterization And Antibiotic Resistance Profile Of Staphylococci In The Lower Rio Grande Valley, Diana E. Trevino
Characterization And Antibiotic Resistance Profile Of Staphylococci In The Lower Rio Grande Valley, Diana E. Trevino
Theses and Dissertations - UTB/UTPA
Staphylococci from part of the natural flora of humans and some, like Staphylococcus aureus, appear to be evolving antibiotic resistance. The Lower Rio Grande Valley (LRGV) is an area of interest due to its proximity to the US/Mexico border where antibiotics could recently be purchased without prescription. Two libraries from community association (CA-S) and environmental association (E-S) have been collected and the staphylococci isolated. We hypothesize that their SCCmec type, which aids the staphylococci in antibiotic resistance, will not display classically defined association schemes and will surface in many species of staphylococci. This study generates antibiotic resistance profiles via antibiotic …
“Breakfast Shots” And Other Stories: Collected Fiction Of Joseph D. Haske, Joseph D. Haske
“Breakfast Shots” And Other Stories: Collected Fiction Of Joseph D. Haske, Joseph D. Haske
Theses and Dissertations - UTB/UTPA
The following thesis for the Master of Fine Arts in Creative Writing consists of two parts. The first part contains five excerpts from a short story cycle, tentatively entitled Breakfast Shots. The second part includes experimentation with the short story form, including the noir-influenced Bloqueo and two minimalist stories derived from this piece. Several stories included in this thesis have been published in journals such as Boulevard, Fiction International, and Dark Sky. The rest are currently under consideration for various journals and anthologies.
Are Progressive Ratio And Fixed Interval Schedules Of Reinforcement Related Measures Of Impulsivity?, Christine Guiterrez
Are Progressive Ratio And Fixed Interval Schedules Of Reinforcement Related Measures Of Impulsivity?, Christine Guiterrez
Theses and Dissertations - UTB/UTPA
The area of impulsivity is widely studied among many different professional fields. However, given the broad brush that has been used to paint the construct of impulsivity, it’s apparent that there is no true agreement on a definitive definition. In the present study, a purely behavioral procedure was tested with 10 female Sprague-Dawley rats who were placed on a progressive ratio and then a fixed interval 20 s schedule of reinforcement to see if these two schedules were related measures of impulsivity. The definition of impulsivity used in this study was relative to the performance of all animals in that …
Use Of Preventative Health Care Services In Hispanic Workers In Manufacturing Sector In South Texas, Pooja Chopra
Use Of Preventative Health Care Services In Hispanic Workers In Manufacturing Sector In South Texas, Pooja Chopra
Theses and Dissertations - UTB/UTPA
This study analyses the factors that determine the intensity of use of preventive health care services for a sample of Hispanic manufacturing workers in South Texas (RGV). Logistic regression is used to estimate the effect of health insurance, age, income level and education on the use of preventive health care of Hispanic workers in the manufacturing sector in South Texas (RGV). The outcome variables are vaccinations, tests and screening for women and men. The sample includes 228 manufacturing workers from the RGV. People with health insurance were more likely to use preventive care services such as vaccination for flu, hepatitis, …
A Study Of Six South Texas Mexican Descent Former Students: Elementary School Experiences And Their Influence On The Students' Decision On High School Completion, Lazaro Ramirez
Theses and Dissertations - UTB/UTPA
The purpose of this study was to explore the interactions between elementary school students and school personnel, family members, and community members to identify factors that contributed to South Texas Mexican descent students dropping out of school. A second purpose was to gain a deeper understanding of Mexican descent former high school dropouts’ middle childhood life experiences. A qualitative methodology was utilized for this study. A three-interview series structure was utilized in conducting three one-on-one semi-structured interviews of six South Texas Mexican descent study participants. The findings of the study indicate that student discipline procedures in South Texas schools attended …
Dropout Prevention: Factors Contributing To The Resiliency Of At-Risk Hispanic Students And Their Pursuit Of A High School Diploma, William Roach
Dropout Prevention: Factors Contributing To The Resiliency Of At-Risk Hispanic Students And Their Pursuit Of A High School Diploma, William Roach
Theses and Dissertations - UTB/UTPA
Dropping out of high school has become a reality for far too many Hispanic high school students. Some estimates have the Hispanic dropout rate at close to 50% (Stutz & Hobbs, 2008). Research on factors contributing to this high dropout rate is well documented and schools across the nation are well aware of the problem. But in spite of this knowledge, the dropout epidemic persists. The purpose of this study was to determine, from a student perspective, what can be done to reduce the number of Hispanic dropouts. Forty-six at-risk Hispanic seniors in a small Texas high school along the …
The Effects Of Teaching The Academic Language Of Language Arts To Secondary Long-Term English Learners, Mary Soto
Theses and Dissertations - UTB/UTPA
While the majority of English language learners are found in elementary schools, an alarming number of these students are entering secondary schools. These secondary students are long-term English learners, students who have been in U.S. schools for seven years or longer. Long-term English learners struggle with academic success, and educators need to find ways to support them. In this qualitative study, the effects of teaching academic vocabulary and concepts to 10th grade Hispanic long-term English learners in a language arts class at a large, South Texas high school were explored. The researcher observed students as they were involved in five …
The Culturally Adapted Public Administrator: How Accredited Mpa Programs Are Preparing Administrators With Cultural Competency, Nicholas Weimer
The Culturally Adapted Public Administrator: How Accredited Mpa Programs Are Preparing Administrators With Cultural Competency, Nicholas Weimer
Theses and Dissertations - UTB/UTPA
The purpose of this thesis is to examine the extent to which National Association of Schools of Public Affairs and Administration (NASPAA) accredited Public Administration terminal professional degree programs address cultural competency in their curriculum, the amount of institutional diversity of these programs, and the relations among these quantities. The sample includes 74 university self-study reports. Cultural competency is the dependent variable of this study and syllabi/abstracts of courses taught constitute the major explanatory variable. Descriptive analysis reveals that 15.4% of the total courses in the sample address elements of cultural competency. The use of frequency statistics further reveal that …
History Of Childhood Sexual Abuse In Mexican Origin Undergraduate Students And Its Relationship To Impulsivity, Jessica Lee Graham
History Of Childhood Sexual Abuse In Mexican Origin Undergraduate Students And Its Relationship To Impulsivity, Jessica Lee Graham
Theses and Dissertations - UTB/UTPA
It is estimated that twenty-five percent of undergraduate female students have experienced some form of sexual abuse while under the age of 18. The definition of childhood sexual abuse, CSA, consists of abusive behaviors of varying intensity and duration and varies across states. Few studies have been done addressing the relationship between CSA and impulsivity. The purpose of this study was to determine if there was an association between a history of childhood sexual abuse and impulsivity in adults of Mexican origin. One hundred fifty-one undergraduates from UTPA participated. For the purposes of this study focus was placed on the …
The First-Integral Method For Duffing-Van Der Pol-Type Oscillator System, Xiaochuan Hu
The First-Integral Method For Duffing-Van Der Pol-Type Oscillator System, Xiaochuan Hu
Theses and Dissertations - UTB/UTPA
In this thesis, we restrict our attention to nonlinear Duffing–van der Pol–type oscillator system by means of the First-integral method. This system has physical relevance as a model in certain flow-induced structural vibration problems, which includes the van der Pol oscillator and the damped Duffing oscillator etc as particular cases. Firstly we apply the Division Theorem for two variables in the complex domain, which is based on the ring theory of commutative algebra, to explore a quasi-polynomial first integral to an equivalent autonomous system. Then through a certain parametric condition, we derive a more general first integral of the Duffing–van …
Development And Implementation Of Challenge-Based Instruction In Engineering Graphics, Gregory A. Potter
Development And Implementation Of Challenge-Based Instruction In Engineering Graphics, Gregory A. Potter
Theses and Dissertations - UTB/UTPA
This thesis discusses the challenge-based instructional (CBI) lessons currently being developed for the Engineering Graphics course at UTPA. This endeavor concentrates on student retention, as well as the students’ ability to practically apply their new skills. Minority science, technology, engineering, and math (STEM) students have been found, in recent studies, to depart from STEM undergraduate fields to some extent because of the lack of real world connections to the subject matter. Also, the traditional way of teaching theory first and then assigning a task may actually stifle creative thought and innovation required in later STEM courses. Our use of CBI …
Life Stories Of Four Conjunto Musicians: Adding To The Culturally Relevant Curriculum Of The Rio Grande Valley Schools, Andres Martinez
Life Stories Of Four Conjunto Musicians: Adding To The Culturally Relevant Curriculum Of The Rio Grande Valley Schools, Andres Martinez
Theses and Dissertations - UTB/UTPA
This study examines music and culture and their importance in the learning process. As early as 1838, Horace Mann and later John Dewey (1916), Tim Brophy (1992) and others were expounding the benefits of music as a necessary element of the school curriculum. Julio Cammarota (2008), Geneva Gay (2000), Alan Singer (1994), Banks and Banks (1989) and others have argued for the importance of culture in the curriculum to enhance learning. Both elements have a unique place in the school curriculum. A brief history of the genre is presented beginning with the early years (mid 1800s), the development years (early …
Zero Inflated Exponential Distribution And It's Variants, Sougata Dhar
Zero Inflated Exponential Distribution And It's Variants, Sougata Dhar
Theses and Dissertations - UTB/UTPA
There have been a lot of studies with respect to the popular Zero Inflated versions of some discrete distributions, like Zero Inflated Poisson and Zero Inflated Negative Binomial distributions. They arise naturally in the literature when one aims to model count data sets having more than usual number of zeros by well known probability distributions. But it can be argued and established that Zero Inflated versions of continuous distributions also make sense. In this thesis, we first provide some motivations for studying Zero Inflated versions of exponential distribution and its variants and then study some parametric and Bayesian aspects related …