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Title: The working relationship of international teaching assistants and undergraduate students.
Creator: Farina, Marcella, Stebbins, Consuelo, Arts and Sciences
Abstract / Description: The present study was conducted to ascertain undergraduate views about the effectiveness of International Teaching Assistants (ITAs) in the American classroom. The study was administered to a stratified cluster sampling by college of the target population, undergraduate students at the University of Central Florida, in Orlando, Florida. The instrument used, Questionnaire of Undergraduates about International Teaching Assistants (QUITA) as developed by Wanda Fox (1990), is composed of a total...
Show moreThe present study was conducted to ascertain undergraduate views about the effectiveness of International Teaching Assistants (ITAs) in the American classroom. The study was administered to a stratified cluster sampling by college of the target population, undergraduate students at the University of Central Florida, in Orlando, Florida. The instrument used, Questionnaire of Undergraduates about International Teaching Assistants (QUITA) as developed by Wanda Fox (1990), is composed of a total of 40 items regarding personal and academic background, cultural exposure to and views about non-native speakers of English, and ITA-classroom effectiveness and problem-solving strategies. On the basis of data from the Fall 1998 semester, approximately 15% of the total number of ITA-taught course sections per college were surveyed. The subjects responded anonymously using computerized answer sheets. Upon completion of the data collection phase, all surveys were analyzed for response frequencies. In addition, background and demographic information regarding the participants and information regarding undergraduate exposure to IT As and IT A instruction were also summarized. The Likert-type items were combined to reveal an overall ATITA (Attitude toward International Teaching Assistants) score. The results of the ATITA portion of the study indicate that undergraduate student views toward IT As and IT A instruction are between neutral and mildly positive. Furthermore, survey responses indicated that undergraduates resolve conflicts involving IT As through personal means. The closing recommendations suggest maintaining open lines of communication between undergraduates, ITAs, and administrators alike.
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Date Issued: 1999
Identifier: CFR0003046, ucf:52915
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0003046

Title: Communism's Futures: Intelligentsia Imaginations in the Writings of the Strugatsky Brothers.
Creator: Tammaro, Elizabeth, Solonari, Vladimir, Gannon, Barbara, French, Scot, University of Central Florida
Abstract / Description: Arkady and Boris Strugatsky were the most popular science fiction writing duo in Soviet Russia from the 1960s through the 1980s. Examining their imaginative fictional worlds against the background of wider changes in the Soviet Union allows scholars to gain insights in the world of the Soviet intelligentsia, the educated bearers of culture. As members of this group, the Strugatskys expressed the hopes, frustrations and fears, of their peers, vindicating their intellectual and emotional life....
Show moreArkady and Boris Strugatsky were the most popular science fiction writing duo in Soviet Russia from the 1960s through the 1980s. Examining their imaginative fictional worlds against the background of wider changes in the Soviet Union allows scholars to gain insights in the world of the Soviet intelligentsia, the educated bearers of culture. As members of this group, the Strugatskys expressed the hopes, frustrations and fears, of their peers, vindicating their intellectual and emotional life. I support the argument that the Brothers occupied a middle ground between conformity and dissident, dubbed the (")lost(") intelligentsia by Lloyd Churchward. I demonstrate this state of being in Soviet society by providing context to popular Strugatsky works, and discussing the evolution of their perspective over time, as displayed in their literature. Featured prominently in Strugatsky works are themes of governmental authority and scientific development, therefore these are the key focuses of this research. The Strugatskys examination of the essential question of the meaning and attainment of happiness adds a new layer of insight to this argument. Studying the Strugatsky Brothers aligns with the greater trend in the field of cultural studies of the Soviet Union, as historians seek to gain greater understanding of how society experienced the communist government. The captivating writing of the Strugatskys, a mixture of foreboding, irony and humor, contributes to the narrative of Soviet history as the authors were culturally significant figures whose legacy remains influential today.
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Date Issued: 2017
Identifier: CFE0006919, ucf:51693
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006919

Title: IMPACT OF SCALE-UP ON SCIENCE TEACHING SELF-EFFICACY OF STUDENTS IN GENERAL EDUCATION SCIENCE COURSES.
Creator: Cassani, Mary Kay, Jeanpierre, Bobby, University of Central Florida
Abstract / Description: The objective of this study was to evaluate the effect of two pedagogical models used in general education science on non-majors' science teaching self-efficacy. Science teaching self-efficacy can be influenced by inquiry and cooperative learning, through cognitive mechanisms described by Bandura (1997). The Student Centered Activities for Large Enrollment Undergraduate Programs (SCALE-UP) model of inquiry and cooperative learning incorporates cooperative learning and inquiry-guided...
Show moreThe objective of this study was to evaluate the effect of two pedagogical models used in general education science on non-majors' science teaching self-efficacy. Science teaching self-efficacy can be influenced by inquiry and cooperative learning, through cognitive mechanisms described by Bandura (1997). The Student Centered Activities for Large Enrollment Undergraduate Programs (SCALE-UP) model of inquiry and cooperative learning incorporates cooperative learning and inquiry-guided learning in large enrollment combined lecture-laboratory classes (Oliver-Hoyo & Beichner, 2004). SCALE-UP was adopted by a small but rapidly growing public university in the southeastern United States in three undergraduate, general education science courses for non-science majors in the Fall 2006 and Spring 2007 semesters. Students in these courses were compared with students in three other general education science courses for non-science majors taught with the standard teaching model at the host university. The standard model combines lecture and laboratory in the same course, with smaller enrollments and utilizes cooperative learning. Science teaching self-efficacy was measured using the Science Teaching Efficacy Belief Instrument – B (STEBI-B; Bleicher, 2004). A science teaching self-efficacy score was computed from the Personal Science Teaching Efficacy (PTSE) factor of the instrument. Using non-parametric statistics, no significant difference was found between teaching models, between genders, within models, among instructors, or among courses. The number of previous science courses was significantly correlated with PTSE score. Student responses to open-ended questions indicated that students felt the larger enrollment in the SCALE-UP room reduced individual teacher attention but that the large round SCALE-UP tables promoted group interaction. Students responded positively to cooperative and hands-on activities, and would encourage inclusion of more such activities in all of the courses. The large enrollment SCALE-UP model as implemented at the host university did not increase science teaching self-efficacy of non-science majors, as hypothesized. This was likely due to limited modification of standard cooperative activities according to the inquiry-guided SCALE-UP model. It was also found that larger SCALE-UP enrollments did not decrease science teaching self-efficacy when standard cooperative activities were used in the larger class.
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Date Issued: 2008
Identifier: CFE0002125, ucf:47560
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002125

Title: AN EXPLORATION OF HOW PRE-SERVICE EARLY CHILDHOOD TEACHERS USE EDUCATIVE CURRICULUM MATERIALS TO SUPPORT THEIR SCIENCE TEACHING PRACTICES.
Creator: Englehart, Deirdre, Boote, David, University of Central Florida
Abstract / Description: Research indicates that a proportion of elementary teachers are not comfortable teaching science to young children. These teachers are unaware of the best methods of approaching science and don't have the science background knowledge to support teaching through inquiry methods. This case study explores the role educative curriculum materials play in supporting pre-service early childhood education teachers' knowledge with science content and teaching practices. Specifically, I examine...
Show moreResearch indicates that a proportion of elementary teachers are not comfortable teaching science to young children. These teachers are unaware of the best methods of approaching science and don't have the science background knowledge to support teaching through inquiry methods. This case study explores the role educative curriculum materials play in supporting pre-service early childhood education teachers' knowledge with science content and teaching practices. Specifically, I examine how educative materials impact pre-service teacher's content knowledge in science and their pedagogical content knowledge related to inquiry methods. Three pre-service early childhood teachers participated in this research. The teachers were initially interviewed about teaching science based upon three instruments: Views of Science Inquiry, Views of the Nature of Science and the Science Teachers Efficacy Beliefs Inventory. Each subject was observed teaching science in their internship site: the first lessons taught were guided or approved by their teachers and the next lessons were conducted using the support of educative curriculum materials. Finally, the initial instruments were once again administered along with an interview to obtain changes in teacher's knowledge, beliefs and understandings of science and science teaching. Results from this research indicate that educative curriculum was supportive of teachers in a variety of ways. Most importantly, this curriculum helped teachers to target more aspects of scientific inquiry during their science lessons than lessons without the use of educative curriculum. The important considerations regarding the effectiveness of the educative curriculum for these pre-service teachers were their underlying beliefs about how science should be taught, their uses of the curriculum materials and reflective practices regarding their own teaching. Results specifically related to early childhood educators include the level of inquiry implemented with young children and how children communicate their findings. Young children need support in their participation of inquiry learning. Successful implementation of guided inquiry practices occurred in this research. Also, the teachers in this research found insightful ways that directly supported young children in their communication of ideas. Implications for further research are also discussed. Educative materials could further support pre-service early childhood teachers if additional supports were used including accessible curricular rationales, support in classroom management and the specific use of guided inquiry.
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Date Issued: 2008
Identifier: CFE0002142, ucf:47520
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002142

Title: THE EFFECTS OF RECIPROCAL TEACHING STRATEGIES ON STUDENTS' COMPREHENSION OF A SEVENTH GRADE LIFE SCIENCE TEXT.
Creator: Bess, Brooke, Jeanpierre, Bobby, University of Central Florida
Abstract / Description: This action research study was conducted with 7th grade life science students at a public middle school in central Florida. The author used Reciprocal Teaching (RT) as described by Annemarie Palincsar and Anne Brown (1984) to examine changes in student comprehension when reading their life science textbook and changes in how the students used the predicting, questioning, and summarizing strategies. The RT strategies ask students to employ 4 strategies: predict what they will read, generate...
Show moreThis action research study was conducted with 7th grade life science students at a public middle school in central Florida. The author used Reciprocal Teaching (RT) as described by Annemarie Palincsar and Anne Brown (1984) to examine changes in student comprehension when reading their life science textbook and changes in how the students used the predicting, questioning, and summarizing strategies. The RT strategies ask students to employ 4 strategies: predict what they will read, generate questions about what was read, clarify any ideas that were not understood in the reading, and summarize the main idea of the reading. Students were given a pre and post reading comprehension test, they completed reading response worksheets to record their predictions, questions, clarifications, and summaries. Students were explicitly taught the 4 strategies prior to using them and the strategies were reinforced through teacher modeling (using think aloud teaching to show students how to use the strategies) and expert scaffolding (giving students the support needed while using the strategies). The teacher-researcher also examined if the students showed change in their level of proficiency when using the strategies after they had been taught them. Analysis of data revealed that student comprehension did increase after being taught the four reading strategies. Data also showed that students became increasingly more proficient when using the strategies as the study progressed. Data analysis also uncovered the unexpected pattern of increased student participation during whole-class and reading group discussions. Further research is needed to examine the effects of teaching highly proficient students specific reading strategies and to see how the explicit instruction of reading strategies affects student participation and achievement during inquiry-based laboratory investigations.
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Date Issued: 2007
Identifier: CFE0001669, ucf:47209
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001669

Title: A CASE STUDY OF THE EFFECTS OF INQUIRY BASED PROFESSIONAL DEVELOPMENT THROUGH THE USE OF A MENTOR ON AN ALTERNATIVELY CERTIFIED ELEMENTARY TEACHER'S SCIENCE TEACHING SELF-EFFICACY.
Creator: Thrift, Michelle, Jeanpierre, Bobby, University of Central Florida
Abstract / Description: One alternatively certified elementary teacher was the subject of this sixteen week research study on science teaching self-efficacy. The researcher taught inquiry based student level science lessons to the fourth grade teacher. The teacher participant, in turn, taught those same lessons to her class while the researcher observed and took field notes. The participant responded to specific open ended questions in a journal after each science experience and also completed three interviews with...
Show moreOne alternatively certified elementary teacher was the subject of this sixteen week research study on science teaching self-efficacy. The researcher taught inquiry based student level science lessons to the fourth grade teacher. The teacher participant, in turn, taught those same lessons to her class while the researcher observed and took field notes. The participant responded to specific open ended questions in a journal after each science experience and also completed three interviews with the researcher. Each sequential lesson from the researcher was then modified based on participant needs. The participant completed the STEBI (Science Teaching Efficacy Belief Instrument) as a pre and post test to measure the effects of the above mentioned activities. The collected data from the STEBI was reported quantitatively. The collected data from the reflective journal entries and interviews were reported qualitatively. After careful analysis of the data gathered for this case study, the researcher came to the conclusion that inquiry based professional development through the use of a mentor affected the alternatively certified elementary teacher's science teaching self-efficacy. The subject maintained a positive attitude about the use of a mentor for the duration of the study and her Personal Science Teaching Efficacy increased or stayed the same on all of the STEBI questions. Limitations of the study as well as recommendations for further research were also discussed.
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Date Issued: 2007
Identifier: CFE0001618, ucf:47189
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001618

Title: A DESCRIPTIVE FRAMEWORK FOR THE PROBLEM-SOLVING EXPERIENCES OF PHYSICS STUDENTS.
Creator: Savrda, Sherry, Boote, David, University of Central Florida
Abstract / Description: This study investigated the applicability of a general model of physics students' problem-solving experiences that suggests there are four dynamic factors affecting the problem-solving process: categorization, goal interpretation, resource relevance, and complexity. Furthermore, it suggests an overarching control factor called stabilization, which describes the inter-relatedness of the other factors over the problem-solving process. Think-aloud protocols of problem-solving experiences...
Show moreThis study investigated the applicability of a general model of physics students' problem-solving experiences that suggests there are four dynamic factors affecting the problem-solving process: categorization, goal interpretation, resource relevance, and complexity. Furthermore, it suggests an overarching control factor called stabilization, which describes the inter-relatedness of the other factors over the problem-solving process. Think-aloud protocols of problem-solving experiences were used to investigate the model. Results of the study showed that conceptual resources had a significant impact on the success of problem-solving attempts. Participants who exhibited a lack of understanding of physics concepts were less likely to check their work, use diagrams effectively, set subgoals, or to use geometric or trigonometric resources, and were more likely to use a formula-driven search for a solution than those who exhibited evidence of conceptual understanding. However, conceptual understanding did guarantee problem-solving success. Mathematical and procedural knowledge was also seen as important. While many of the specific observations were consistent with the existing literature, the model provides an alternative framework with which to understand and synthesize those observations. The model was shown to be partially successful in describing participants' problem-solving experiences. Categorization, resource relevance and goal interpretation were supported to varying degrees; however, there was less evidence to support the construct of complexity. Determination of evidence for stabilization was guided by a working definition based on the participants' search for a stable understanding of the problem. Implications of these results for research and practice were noted.
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Date Issued: 2007
Identifier: CFE0001619, ucf:47170
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001619

Title: SCIENCE SELF-EFFICACY IN TENTH GRADE HISPANIC FEMALE HIGH SCHOOL STUDENTS.
Creator: Miller, Maria, Biraimah, Karen, University of Central Florida
Abstract / Description: Historical data have demonstrated an underrepresentation of females and minorities in science, technology, engineering, and mathematics (STEM) professions. The purpose of the study considered the variables of gender and ethnicity collectively in relationship to tenth grade Hispanic females' perception of their self-efficacy in science. The correlation of science self-efficacy to science academic achievement was also studied. Possible interventions for use with female Hispanic minority...
Show moreHistorical data have demonstrated an underrepresentation of females and minorities in science, technology, engineering, and mathematics (STEM) professions. The purpose of the study considered the variables of gender and ethnicity collectively in relationship to tenth grade Hispanic females' perception of their self-efficacy in science. The correlation of science self-efficacy to science academic achievement was also studied. Possible interventions for use with female Hispanic minority populations might help increase participation in STEM field preparation during the high school career. A population of 272 students was chosen through convenience sampling methods, including 80 Hispanic females. Students were administered a 27-item questionnaire taken directly from the Smist (1993) Science Self-efficacy Questionnaire (SSEQ). Three science self-efficacy factors were successfully extracted and included Academic Engagement Self-efficacy (M=42.57), Laboratory Self-efficacy (M=25.44), and Biology Self-efficacy (M=19.35). Each factor showed a significant positive correlation (p<.01) to each of the other two factors. ANOVA procedures compared all female subgroups in their science self-efficacy perceptions. Asian/Pacific and Native American females had higher self-efficacy mean scores as compared to White, Black and Hispanic females on all three extracted science self-efficacy factors. Asian/Pacific females had the highest mean scores. No statistically significant correlations were found between science-self-efficacy and a measure of science achievement. Two high-ability and two low-ability Hispanic females were randomly chosen to participate in a brief structured interview. Three general themes emerged. Classroom Variables, Outside School Variables, and Personal Variables were subsequently divided into sub themes influenced by participants' views of science, It was concluded that Hispanic female science self-efficacy was among the subgroups which self-scored the lowest. Asian/Pacific and Native American females fared better than White, Black, and Hispanic female counterparts respectively. Triangulation of interview and quantitative data showed that classroom factors, specifically academic engagement, influenced participant perceptions of science self efficacy the greatest. Suggested further studies on the impact of science self-efficacy and science achievement are discussed. Information gleaned from the continued study of science self-efficacy may influence the ability of traditionally underrepresented racial/ethnic females to persist in their science preparation and training in an effort to prevent leaving the STEM pipeline at this crucial juncture.
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Date Issued: 2006
Identifier: CFE0000933, ucf:46743
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000933

Title: PERFORMANCE EFFICACY USING A COMPARISON OF COMMERCIAL AND IN-HOUSE Y-STR MULTIPLEX SYSTEMS FOR OPERATIONAL USE.
Creator: Mayntz-Press, Kathleen, Ballantyne, Jack, University of Central Florida
Abstract / Description: It is routine for the forensic scientist to obtain a genetic profile of an individual from DNA recovered from a biological stain deposited at a crime scene. In contrast, only a limited number of laboratories in the United States have the capability of performing Y-STR analysis in casework. In order to aid in facilitating the transfer of Y-STR technology to the crime laboratory community for operational use, a comparison between commercial products from three main vendors (Applied Biosystems...
Show moreIt is routine for the forensic scientist to obtain a genetic profile of an individual from DNA recovered from a biological stain deposited at a crime scene. In contrast, only a limited number of laboratories in the United States have the capability of performing Y-STR analysis in casework. In order to aid in facilitating the transfer of Y-STR technology to the crime laboratory community for operational use, a comparison between commercial products from three main vendors (Applied Biosystems AmpFℓSTR® Yfiler™ PCR Amplification Kit, Promega PowerPlex® – Y System, Reliagene Y-PLEX™ 12) and two in-house Y-STR multiplexes (MPI and MPB) commenced. The main intention for this comparison was to ascertain whether commercial Y-STR kits are able to obtain a male profile from difficult samples which have been accomplished with our in-house Y-STR multiplexes; such as mixtures, post coital specimens, and environmental insults. To aid the crime laboratory community an in depth comparison of the three main commercial Y-STR kits began in hopes to glean information in circumstances where Y chromosome polymorphisms may need to be employed. For example, the ability to provide investigators with the numbers of semen donors in multiple rape cases, identification of the genetic profile of the male component in a male/female mixture, and identification of the genetic profile of the male component in an extended interval post-coital sample. The capability of typing Y-STR loci by the crime laboratory community could dramatically affect the admissibility of Y-STR evidence. Therefore, the comparison of commercially available kits is an imperative process by which the scientific community acquires the necessary information to assess the ability of a procedure to obtain reliable results, determine the conditions under which such results can be obtained and define the limitations of the procedure. Thus the information for the study could lend itself to a standard being established amongst Y-STR kits for operational use and/or the production of a new Y-STR kit. One example of how the comparison of the three main commercial Y-STR kits could directly impact a new standard being established is by examining post-coital samples and their extreme limits (>48 hrs) for each kit in which a full male genetic profile was observed and comparing it to other commercial Y-STR kit and in-house Y-STR multiplexes. This would help establish the types of cases where specific Y-STR kits would be most useful, and the parameters in which each kit is able to perform. Thus leading to the development of a highly sensitive Y-STR kit that would be more sufficient to perform with the variety of samples an operational crime laboratory would routinely analyze. The capability of typing Y-STR loci by the crime laboratory community could dramatically affect the admissibility of Y-STR evidence. Therefore, the comparison of commercially available kits is an imperative process in order to inform the forensic community of different Y-STR kits available and their performance through direct comparison using modified SWGDAM validation guidelines.
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Date Issued: 2006
Identifier: CFE0001026, ucf:46824
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0001026

Title: EFFECTIVENESS OF CARDIAC REHABILITATION: SECONDARY PREVENTION INCREASES FUNCTIONAL CAPACITY IN POST-MYOCARDIAL INFARCTION PATIENTS.
Creator: Badillo, Kristin, Fisher, Thomas, University of Central Florida
Abstract / Description: The purpose of this study was to discern the effectiveness of Cardiac Rehabilitation/ Secondary Prevention Programs (CR/ SPPs) by evaluating increased functional capacity in the form of MET (metabolic equivalent) scores post-myocardial infarction (MI) or heart attack. The Duke Activity Status Index (DASI) survey is administered as part of the Standard Operating Procedure (SOP) for participation in the Secondary Prevention Program. Criterion for the research included patients 65 and older,...
Show moreThe purpose of this study was to discern the effectiveness of Cardiac Rehabilitation/ Secondary Prevention Programs (CR/ SPPs) by evaluating increased functional capacity in the form of MET (metabolic equivalent) scores post-myocardial infarction (MI) or heart attack. The Duke Activity Status Index (DASI) survey is administered as part of the Standard Operating Procedure (SOP) for participation in the Secondary Prevention Program. Criterion for the research included patients 65 and older, with a history of one myocardial infarction, and had completed all 36 sessions of CR. The scores from 11 SPP surveys were analyzed and compared in three time increments from sessions 1-18 (initial, or"pre"), sessions 19-36 ("pan"), and sessions 1-36 ("post"). A total of 11 (n=11) surveys were collected and analyzed at The Computing and Statistical Technology Laboratory in Education (CASTLE) in the Teaching Academy on UCF Main Campus. Results from the data showed mean MET scores of 6.21 at session 1, 7.59 at session 18, and 8.15 at session 36. The mean changes over time represented in METs were 1.38 (1), .56 (18), and 1.93 (36). Percent changes over time were 27% (1), 8% (18), and 36% (36). This study showed increased functional capacity over time and will improve program design in terms of frequency and duration.
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Date Issued: 2015
Identifier: CFH0004770, ucf:45339
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004770

Title: EFFECTS OF CAFFEINATED ENERGY DRINK AND ALCOHOL USAGE ON PERCEIVED STRESS AND BURNOUT IN UNDERGRADUATE STUDENTS.
Creator: Patel, Arjun, Webster, Danielle, University of Central Florida
Abstract / Description: Caffeinated energy beverages (CEDs) are a growing supplement being consumed by a large number of young adults aged 18 to 24 years of age. As these CEDs contain nutritional supplements, they are not classified the same way other beverages such as sodas are and they can thus bypass regulation by the Food and Drug Administration. Without regulation by this governing body, it is important to understand how these supplements may be affecting their target population. In this study, students from a...
Show moreCaffeinated energy beverages (CEDs) are a growing supplement being consumed by a large number of young adults aged 18 to 24 years of age. As these CEDs contain nutritional supplements, they are not classified the same way other beverages such as sodas are and they can thus bypass regulation by the Food and Drug Administration. Without regulation by this governing body, it is important to understand how these supplements may be affecting their target population. In this study, students from a large university were recruited in order to determine patterns of CED usage as well as how CED usage may affect perceived stress and burnout. Alcohol usage, another type of beverage commonly consumed in this population, was also assayed in this group in order to determine how perceived stress and burnout are affected. The study was case-control in nature, as regular users of CEDs were compared against students who were not regular consumers. From the data, no major relationships could be identified in regards to perceived stress, burnout, and CED usage. However, extracurricular activity was found to be somewhat predictive of CED usage while alcohol usage was found to be negatively correlated with perceived stress.
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Date Issued: 2015
Identifier: CFH0004787, ucf:45333
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004787

Title: METHOD TO DISCRETIZE CONTINUOUS GRADIENT STRUCTURES AND CALCULATE THERMAL RESIDUAL STRESSES WITHIN LAYERED FUNCTIONALLY GRADED CERAMICS.
Creator: Neale, Ryan E, Orlovskaya, Nina, University of Central Florida
Abstract / Description: Functionally graded materials (FGMs) are an advanced class of material which seeks to leverage the strengths of one material to mitigate the weaknesses of another. This allows for operation in extreme environments or conditions where materials properties must change at various locations within a structure. Fabrication of this advanced class of material is limited due to geometric, economic, and material constraints inherent in the various methods. For this reason, a model was developed to...
Show moreFunctionally graded materials (FGMs) are an advanced class of material which seeks to leverage the strengths of one material to mitigate the weaknesses of another. This allows for operation in extreme environments or conditions where materials properties must change at various locations within a structure. Fabrication of this advanced class of material is limited due to geometric, economic, and material constraints inherent in the various methods. For this reason, a model was developed to discretize continuous gradient curves to allow for the use of a step-wise approximations to such gradients. These alternative step-wise gradients would allow for the use of numerous manufacturing techniques which have improved composition control, cost of processing, cost of equipment, and equipment availability. One such technique, tape casting, was explored due to its robustness and ability to create layered ceramics. Since ceramics are inherently brittle materials, they serve to be strengthened by the thermal residual stresses that form in the creation of these step-wise graded composites. With models to calculate these residual stresses and determine step-wise approximations of various compositional gradients, the process of designing these layered ceramics can be significantly improved.
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Date Issued: 2019
Identifier: CFH2000530, ucf:45633
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000530

Title: THE AMBIVALENCE OF SCIENCE FICTION: SCIENCE FICTION, NEO-IMPERIALISM, AND THE IDEOLOGY OF MODERNITY AS PROGRESS.
Creator: Hall, Graham, Campbell, James, University of Central Florida
Abstract / Description: This thesis sets out to examine the relationship between science fiction and its conditions of production, specifically interrogating the genre's articulations of the ideology of modernity as progress. Sf has been characterized variously as a characteristically useful critical engagement with the ideologies of its context and as wholly ideological at the level of form, relying on the authority of a scientific episteme in its "cognitive estrangements," while not obligated to operate within the...
Show moreThis thesis sets out to examine the relationship between science fiction and its conditions of production, specifically interrogating the genre's articulations of the ideology of modernity as progress. Sf has been characterized variously as a characteristically useful critical engagement with the ideologies of its context and as wholly ideological at the level of form, relying on the authority of a scientific episteme in its "cognitive estrangements," while not obligated to operate within the boundaries of this episteme. As such, the genre is unparalleled in its capacity to articulate ideologies under the guise of a putatively neutral science and reason. However, this same formal action places the genre in the unique position of being able to utilize the authority of a scientific episteme to re-evaluate the putative neutrality of that very scientific episteme. As a result, this study concludes that while the genre's reliance on the external authority of science in "cognitively" organizing its estrangements may make it particularly conducive to articulating ideological technoscience and the ideology of modernity as progress, the genre is characteristically ambivalent in this respect, both at the level of form and as a result of the incongruities between form and narrative. To support my thesis I engage a number of science fictional texts, focusing on Golden Age sf of the mid-20th century, while also branching out into explorations of a variety of 20th and 21st century sf texts, including texts from the pulp era, New Wave, cyberpunk, and post-singularity sf. I analyze within the effects of the conceptual mapping of society in terms of the natural sciences in sf, as well as the ambivalent presence of the robot as a megatextual motif, exploring the relationship of these to the ideology of modernity as progress and the post-scarcity fantasy of global mass consumption prosperity.
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Date Issued: 2013
Identifier: CFH0004471, ucf:45121
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004471

Title: THE THERMODYNAMICS OF PLANETARY ENGINEERING ON THE PLANET MARS.
Creator: Barsoum, Christopher, Lin, Kuo-Chi, University of Central Florida
Abstract / Description: Mars is a potentially habitable planet given the appropriate planetary engineering efforts. In order to create a habitable environment, the planet must be terraformed, creating quasi-Earth conditions. Benchmarks for minimum acceptable survivable human conditions were set by observing atmospheric pressures and temperatures here on Earth that humans are known to exist in. By observing a positive feedback reaction, it is shown how the sublimation of the volatile southern polar ice cap on Mars...
Show moreMars is a potentially habitable planet given the appropriate planetary engineering efforts. In order to create a habitable environment, the planet must be terraformed, creating quasi-Earth conditions. Benchmarks for minimum acceptable survivable human conditions were set by observing atmospheric pressures and temperatures here on Earth that humans are known to exist in. By observing a positive feedback reaction, it is shown how the sublimation of the volatile southern polar ice cap on Mars can increase global temperatures and pressures to the benchmarks set for minimum acceptable survivable human conditions. Given the degree of uncertainty, utilization of pressure scale heights and the Martin extreme terrain were used to show how less than desirable conditions can still produce results where these benchmarks can be met. Methods for obtaining enough energy to sublimate the southern polar ice cap were reviewed in detail. A new method of using dark, carbonaceous Martian moon material to alter the overall average albedo of the polar ice cap is proposed. Such a method would increase Martian energy efficiency. It is shown that by covering roughly 10% of the Martian polar ice cap with dark carbonaceous material, this required energy can be obtained. Overall contributions include utilization of pressure scale heights at various suggested settlement sites, as well as polar albedo altering as a method of planetary engineering. This project serves as a foundational work for long term solar system exploration and settlement.
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Date Issued: 2014
Identifier: CFH0004540, ucf:45225
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004540

Title: IN-SITU GAS PHASE CATALYTIC PROPERTIES OF METAL NANOPARTICLES.
Creator: Ono, Luis, Roldan Cuenya, Beatriz, University of Central Florida
Abstract / Description: Recent advances in surface science technology have opened new opportunities for atomic scale studies in the field of nanoparticle (NP) catalysis. The 2007 Nobel Prize of Chemistry awarded to Prof. G. Ertl, a pioneer in introducing surface science techniques to the field of heterogeneous catalysis, shows the importance of the field and revealed some of the fundamental processes of how chemical reactions take place at extended surfaces. However, after several decades of intense research,...
Show moreRecent advances in surface science technology have opened new opportunities for atomic scale studies in the field of nanoparticle (NP) catalysis. The 2007 Nobel Prize of Chemistry awarded to Prof. G. Ertl, a pioneer in introducing surface science techniques to the field of heterogeneous catalysis, shows the importance of the field and revealed some of the fundamental processes of how chemical reactions take place at extended surfaces. However, after several decades of intense research, fundamental understanding on the factors that dominate the activity, selectivity, and stability (life-time) of nanoscale catalysts are still not well understood. This dissertation aims to explore the basic processes taking place in NP catalyzed chemical reactions by systematically changing their size, shape, oxide support, and composition, one factor at a time. Low temperature oxidation of CO over gold NPs supported on different metal oxides and carbides (SiO2, TiO2, TiC, etc.) has been used as a model reaction. The fabrication of nanocatalysts with a narrow size and shape distribution is essential for the microscopic understanding of reaction kinetics on complex catalyst systems ("real-world" systems). Our NP synthesis tools are based on self-assembly techniques such as diblock-copolymer encapsulation and nanosphere lithography. The morphological, electronic and chemical properties of these nanocatalysts have been investigated by atomic force microscopy (AFM), scanning tunneling microscopy (STM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and temperature-programmed desorption (TPD). Chapter 1 describes briefly the basic principles of the instrumentation used within this experimental dissertation. Since most of the state-of-art surface science characterization tools provide ensemble-averaged information, catalyst samples with well defined morphology and structure must be available to be able to extract meaningful information on how size and shape affect the physical and chemical properties of these structures. In chapter 2, the inverse-micelle encapsulation and nanosphere lithography methods used in this dissertation for synthesizing uniformly arranged and narrow size- and shape-selected spherical and triangular NPs are described. Chapter 3 describes morphological changes on individual Au NPs supported on SiO2 as function of the annealing temperature and gaseous environment. In addition, NP mobility is monitored. Chapter 4 explores size-effects on the electronic and catalytic properties of size-selected Au NPs supported on a transition metal carbide, TiC. The effect of interparticle interactions on the reactivity and stability (catalyst lifetime) of Au NPs deposited on TiC is discussed in chapter 5. Size and support effects on the formation and thermal stability of Au2O3, PtO and PtO2 on Au and Pt NPs supported on SiO2, TiO2 and ZrO2 is investigated in chapter 6. Emphasis is given to gaining insight into the role of the NP/support interface and that played by oxygen vacancies on the stability of the above metal oxides. Chapter 7 reports on the formation, thermal stability, and vibrational properties of mono- and bimetallic AuxFe1-x (x = 1, 0.8, 0.5, 0.2, 0) NPs supported on TiO2(110). At the end of the thesis, a brief summary describes the main highlights of this 5-year research program.
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Date Issued: 2009
Identifier: CFE0002940, ucf:47962
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002940

Title: LEVELS OF LINE GRAPH QUESTION INTERPRETATION WITH INTERMEDIATE ELEMENTARY STUDENTS OF VARYING SCIENTIFIC AND MATHEMATICAL KNOWLEDGE AND ABILITY: A THINK ALOUD STUDY.
Creator: Keller, Stacy, Biraimah, Karen, University of Central Florida
Abstract / Description: This study examined how intermediate elementary students' mathematics and science background knowledge affected their interpretation of line graphs and how their interpretations were affected by graph question levels. A purposive sample of 14 6th-grade students engaged in think aloud interviews (Ericsson & Simon, 1993) while completing an excerpted Test of Graphing in Science (TOGS) (McKenzie & Padilla, 1986). Hand gestures were video recorded. Student performance on the TOGS was assessed...
Show moreThis study examined how intermediate elementary students' mathematics and science background knowledge affected their interpretation of line graphs and how their interpretations were affected by graph question levels. A purposive sample of 14 6th-grade students engaged in think aloud interviews (Ericsson & Simon, 1993) while completing an excerpted Test of Graphing in Science (TOGS) (McKenzie & Padilla, 1986). Hand gestures were video recorded. Student performance on the TOGS was assessed using an assessment rubric created from previously cited factors affecting students' graphing ability. Factors were categorized using Bertin's (1983) three graph question levels. The assessment rubric was validated by Padilla and a veteran mathematics and science teacher. Observational notes were also collected. Data were analyzed using Roth and Bowen's semiotic process of reading graphs (2001). Key findings from this analysis included differences in the use of heuristics, self-generated questions, science knowledge, and self-motivation. Students with higher prior achievement used a greater number and variety of heuristics and more often chose appropriate heuristics. They also monitored their understanding of the question and the adequacy of their strategy and answer by asking themselves questions. Most used their science knowledge spontaneously to check their understanding of the question and the adequacy of their answers. Students with lower and moderate prior achievement favored one heuristic even when it was not useful for answering the question and rarely asked their own questions. In some cases, if students with lower prior achievement had thought about their answers in the context of their science knowledge, they would have been able to recognize their errors. One student with lower prior achievement motivated herself when she thought the questions were too difficult. In addition, students answered the TOGS in one of three ways: as if they were mathematics word problems, science data to be analyzed, or they were confused and had to guess. A second set of findings corroborated how science background knowledge affected graph interpretation: correct science knowledge supported students' reasoning, but it was not necessary to answer any question correctly; correct science knowledge could not compensate for incomplete mathematics knowledge; and incorrect science knowledge often distracted students when they tried to use it while answering a question. Finally, using Roth and Bowen's (2001) two-stage semiotic model of reading graphs, representative vignettes showed emerging patterns from the study. This study added to our understanding of the role of science content knowledge during line graph interpretation, highlighted the importance of heuristics and mathematics procedural knowledge, and documented the importance of perception attentions, motivation, and students' self-generated questions. Recommendations were made for future research in line graph interpretation in mathematics and science education and for improving instruction in this area.
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Date Issued: 2008
Identifier: CFE0002356, ucf:47810
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002356

Title: A FRAMEWORK FOR EFFICIENT DATA DISTRIBUTION IN PEER-TO-PEER NETWORKS.
Creator: Purandare, Darshan, Guha, Ratan, University of Central Florida
Abstract / Description: Peer to Peer (P2P) models are based on user altruism, wherein a user shares its content with other users in the pool and it also has an interest in the content of the other nodes. Most P2P systems in their current form are not fair in terms of the content served by a peer and the service obtained from swarm. Most systems suffer from free rider's problem where many high uplink capacity peers contribute much more than they should while many others get a free ride for downloading the content...
Show morePeer to Peer (P2P) models are based on user altruism, wherein a user shares its content with other users in the pool and it also has an interest in the content of the other nodes. Most P2P systems in their current form are not fair in terms of the content served by a peer and the service obtained from swarm. Most systems suffer from free rider's problem where many high uplink capacity peers contribute much more than they should while many others get a free ride for downloading the content. This leaves high capacity nodes with very little or no motivation to contribute. Many times such resourceful nodes exit the swarm or don't even participate. The whole scenario is unfavorable and disappointing for P2P networks in general, where participation is a must and a very important feature. As the number of users increases in the swarm, the swarm becomes robust and scalable. Other important issues in the present day P2P system are below optimal Quality of Service (QoS) in terms of download time, end-to-end latency and jitter rate, uplink utilization, excessive cross ISP traffic, security and cheating threats etc. These current day problems in P2P networks serve as a motivation for present work. To this end, we present an efficient data distribution framework in Peer-to-Peer (P2P) networks for media streaming and file sharing domain. The experiments with our model, an alliance based peering scheme for media streaming, show that such a scheme distributes data to the swarm members in a near-optimal way. Alliances are small groups of nodes that share data and other vital information for symbiotic association. We show that alliance formation is a loosely coupled and an effective way to organize the peers and our model maps to a small world network, which form efficient overlay structures and are robust to network perturbations such as churn. We present a comparative simulation based study of our model with CoolStreaming/DONet (a popular model) and present a quantitative performance evaluation. Simulation results show that our model scales well under varying workloads and conditions, delivers near optimal levels of QoS, reduces cross ISP traffic considerably and for most cases, performs at par or even better than Cool-Streaming/DONet. In the next phase of our work, we focussed on BitTorrent P2P model as it the most widely used file sharing protocol. Many studies in academia and industry have shown that though BitTorrent scales very well but is far from optimal in terms of fairness to end users, download time and uplink utilization. Furthermore, random peering and data distribution in such model lead to suboptimal performance. Lately, new breed of BitTorrent clients like BitTyrant have shown successful strategic attacks against BitTorrent. Strategic peers configure the BitTorrent client software such that for very less or no contribution, they can obtain good download speeds. Such strategic nodes exploit the altruism in the swarm and consume resources at the expense of other honest nodes and create an unfair swarm. More unfairness is generated in the swarm with the presence of heterogeneous bandwidth nodes. We investigate and propose a new token-based anti-strategic policy that could be used in BitTorrent to minimize the free-riding by strategic clients. We also proposed other policies against strategic attacks that include using a smart tracker that denies the request of strategic clients for peer listmultiple times, and black listing the non-behaving nodes that do not follow the protocol policies. These policies help to stop the strategic behavior of peers to a large extent and improve overall system performance. We also quantify and validate the benefits of using bandwidth peer matching policy. Our simulations results show that with the above proposed changes, uplink utilization and mean download time in BitTorrent network improves considerably. It leaves strategic clients with little or no incentive to behave greedily. This reduces free riding and creates fairer swarm with very little computational overhead. Finally, we show that our model is self healing model where user behavior changes from selfish to altruistic in the presence of the aforementioned policies.
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Date Issued: 2008
Identifier: CFE0002260, ucf:47864
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002260

Title: The physical properties and composition of main-belt asteroids from infrared spectroscopy.
Creator: Landsman, Zoe, Campins, Humberto, Britt, Daniel, Fernandez, Yan, Emery, Joshua, Hernandez, Florencio, University of Central Florida
Abstract / Description: Asteroids are the remnants of planet formation, and as such, they represent a record of the physical and chemical conditions in the early solar system and its evolution over the past 4.6 billion years. Asteroids are relatively accessible by spacecraft, and thus may be a source of the raw materials necessary for future human exploration and settlement of space. Those on Earth-crossing orbits pose impact hazards for which mitigation strategies must be developed. For these reasons, several...
Show moreAsteroids are the remnants of planet formation, and as such, they represent a record of the physical and chemical conditions in the early solar system and its evolution over the past 4.6 billion years. Asteroids are relatively accessible by spacecraft, and thus may be a source of the raw materials necessary for future human exploration and settlement of space. Those on Earth-crossing orbits pose impact hazards for which mitigation strategies must be developed. For these reasons, several missions to asteroids are in progress or planned with the support of the National Aeronautics and Space Administration (NASA) and other national space agencies. The study of asteroid composition and physical surface properties is vital to both our scientific understanding of the solar system's formation and evolution and to the development of asteroid missions and resource utilization schemes. This dissertation uses infrared spectroscopy to investigate the composition and physical properties of main-belt asteroid surfaces. Our efforts are focused on two populations that are especially relevant to constraining thermal and collisional processes in the asteroid belt: the "M-type" asteroids and primitive asteroid families.To investigate volatiles in the M-type asteroids, we obtained 2-4 micron spectra of six M-type asteroids using NASA's Infrared Telescope Facility. We find spectral signatures of hydrated minerals on all six asteroids, with evidence for rotational variability of hydration in one target. Diversity in the shape of the 3-micron feature in our sampled asteroids suggests there are different modes of hydration in the M-type population. Next, we carried out a thermal and compositional study of M-type asteroid (16) Psyche using 5-14 micron spectra from the Spitzer Space Telescope. Psyche is suspected to be a remnant iron core, and it is the target of an upcoming NASA mission. Using thermophysical modeling, we find that Psyche's surface is smooth and most likely has a thermal inertia of 5-25 J/m^2/K/s^(1/2), and a bolometric emissivity of 0.9, although a scenario with an emissivity of 0.7 and thermal inertia up to 95 J/m^2/K/s^(1/2) is possible if Psyche is somewhat larger than previously determined. From comparisons with laboratory spectra of silicate and meteorite powders, Psyche's emissivity spectrum is consistent with the presence of fine-grained ((<)75 micron) silicates. These silicates may include a magnesian pyroxene component. We conclude that Psyche is likely covered in a fine silicate regolith, which may also contain iron grains, overlying an iron-rich bedrock.Finally, we compared the mid-infrared properties of two primitive asteroids families, ancient Themis (~2.5 Gyr) and young Veritas (~8 Myr). Visible and near-infrared studies show spectral differences between the two families attributed to different degrees of space weathering. To test whether these differences are apparent in the mid-infrared, we analyzed the 5-14 micron Spitzer Space Telescope spectra of 11 Themis-family asteroids and 9 Veritas-family asteroids. We detect a broad 10-micron emission feature, attributed to fine-grained and/or porous silicate regolith, in all 11 Themis-family spectra and six of nine Veritas-family asteroids, with 10-micron spectral contrast ranging from 1% +/- 0.1% to 8.5% +/- 0.9%. Comparison with laboratory spectra of primitive meteorites suggests these asteroids are similar to meteorites with relatively low abundances of phyllosilicates. We used thermal modeling to derive diameters, beaming parameters and albedos for our sample. Asteroids in both families have beaming parameters near unity and geometric albedos in the range 0.031-0.14. Spectral contrast of the 10-micron silicate emission feature is not correlated with asteroid diameter; however, higher 10-micron contrast may be associated with flatter spectral slopes in the near-infrared. There is a slight trend of increasing 10-micron contrast with decreasing albedo in the Veritas asteroids, but not the Themis asteroids. Overall, our results indicate the Themis and Veritas family members show variation in regolith texture and/or structure within both families that is not directly related to family age.
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Date Issued: 2017
Identifier: CFE0007124, ucf:51966
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007124

Title: Predicting Students' Academic Performance with Decision Tree and Neural Network.
Creator: Feng, Junshuai, Jha, Sumit Kumar, Zhang, Wei, Zhang, Shaojie, University of Central Florida
Abstract / Description: Educational Data Mining (EDM) is a developing research field that involves many techniques to explore data relating to educational background. EDM can analyze and resolve educational data with computational methods to address educational questions. Similar to EDM, neural networks have been utilized in widespread and successful data mining applications. In this paper, synthetic datasets are employed since this paper aims to explore the methodologies such as decision tree classifiers and neural...
Show moreEducational Data Mining (EDM) is a developing research field that involves many techniques to explore data relating to educational background. EDM can analyze and resolve educational data with computational methods to address educational questions. Similar to EDM, neural networks have been utilized in widespread and successful data mining applications. In this paper, synthetic datasets are employed since this paper aims to explore the methodologies such as decision tree classifiers and neural networks to predict student performance in the context of EDM. Firstly, it introduces EDM and some relative works that have been accomplished previously in this field along with their datasets and computational results. Then, it demonstrates how the synthetic student dataset is generated, analyzes some input attributes from the dataset such as gender and high school GPA, and delivers with some visualization results to determine which classification methods approaches are the most efficient. After testing the data with decision tree classifiers and neural networks methodologies, it concludes the effectiveness of both approaches in terms of the model evaluation performance as well as discussing some of the most promising future work of this research.
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Date Issued: 2019
Identifier: CFE0007455, ucf:52680
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007455

Title: Government Respect for Human Rights and their Relation to Shadow Economic Activity.
Creator: Gahagan, Christopher, Mousseau, Demet, Marien, Daniel, Reynolds, Teddy, University of Central Florida
Abstract / Description: Shadow economic activity can have detrimental effects on many aspects of a society including trust in government policies, quality of public institutions, government revenues, and economic growth. Empirical studies have generally employed a rational actor approach and focused on economic factors. Most studies in this literature claim that when individuals do not receive the right economic stimuli from the government, it damages the relationship between individuals and the state and citizens...
Show moreShadow economic activity can have detrimental effects on many aspects of a society including trust in government policies, quality of public institutions, government revenues, and economic growth. Empirical studies have generally employed a rational actor approach and focused on economic factors. Most studies in this literature claim that when individuals do not receive the right economic stimuli from the government, it damages the relationship between individuals and the state and citizens opt to move into the shadow economy. A small but growing body of research, however, suggests that certain political factors can also lead to shadow economic activity because of a breakdown in the relationship between individuals and the state. Building on this growing body of research, this study investigates how governments' repression of human rights can play an important role in the growth of shadow economic activities. The empirical literature on human rights offer three main groups of human rights: Survival Rights (physical integrity), Women's Economic Rights, and Civil Liberties (i.e. freedom of speech). This study expects a similar pattern for all sectors of human rights, that when they are abused, citizens will react to those abuses by moving into the shadow economy because of the breakdown in the citizen-state relationship. Several multiple regression analyses are conducted for 150 countries from the years 1999 to 2011 to investigate if these different types of human rights had an impact on the levels of shadow economic activity. Results indicate that while Survival Rights and Women's Economic Rights have no statistically significant impact on the size of the shadow economy, the respect or abuse of citizens' Civil Liberties are statistically significant after the introduction of control variables. A possible reason for the difference in these findings might be that while the fear of reprisal of Survival Rights can work to deter shadow economic activity, repression of Civil Liberties may not create enough fear to deter it. Future research is necessary in this area to expand our knowledge on the political determinants of the size of the shadow economy as well as the creation of policies to combat its growth.
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Date Issued: 2019
Identifier: CFE0007459, ucf:52691
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007459

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