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- Title
- Characterization of SLM-Manufactured Turbine Blade Microfeatures from Superalloy Powders.
- Creator
-
Ealy, Brandon, Kapat, Jayanta, Ahmed, Kareem, Vasu Sumathi, Subith, University of Central Florida
- Abstract / Description
-
The limits of gas turbine technology are heavily influenced by materials and manufacturing capabilities. Inconel remains the material of choice for most hot gas path (HGP) components in gas turbines, however recent increases in turbine inlet temperature (TIT) are associated with the development of advanced convective cooling methods and ceramic thermal barrier coatings. Increasing cycle efficiency and cycle specific work are the primary drivers for increasing TIT. Lately, incremental...
Show moreThe limits of gas turbine technology are heavily influenced by materials and manufacturing capabilities. Inconel remains the material of choice for most hot gas path (HGP) components in gas turbines, however recent increases in turbine inlet temperature (TIT) are associated with the development of advanced convective cooling methods and ceramic thermal barrier coatings. Increasing cycle efficiency and cycle specific work are the primary drivers for increasing TIT. Lately, incremental performance gains responsible for increasing the allowable TIT have been made mainly through innovations in cooling technology, specifically convective cooling schemes. An emerging manufacturing technology may further facilitate the increase of allowable maximum TIT, thereby impacting cycle efficiencies. Laser Additive Manufacturing (LAM) is a promising manufacturing technology that uses lasers to selectively melt powders of metal in a layer-by-layer process to directly manufacture components, paving the way to produce designs that are not possible with conventional casting methods. This study investigates manufacturing qualities seen in LAM methods and its ability to successfully produce complex microfeatures in a mock turbine blade leading edge. Various cooling features are incorporated in design, consisting of internal impingement cooling, internal lattice structures, and external showerhead cooling. The internal structure is designed as a lattice of intersecting cylinders in order to mimic that of a porous material. Through a non-destructive approach, the presented design is analyzed against the departure of the design by utilizing X-ray computed tomography (CT). Employing this non-destructive testing (NDT) method, a more thorough analysis of the quality of manufacture is established by revealing the internal structures of the porous region and internal impingement array. Variance distribution between the design and manufactured test article are carried out for both internal impingement and external transpiration hole diameters from CT data. Flow testing is performed to characterize the uniformity of porous regions and flow behavior across the entire article for various pressure ratios. Discharge coefficients of internal impingement arrays and porous structures are quantified. A numerical model of fluid flow through the exact CAD geometry is analyzed over the range of experimental flowrates. By comparison of experimental and numerical data, performance discrepancies associated with manufacturing quality are observed. Simplifying assumptions to the domain are evaluated to compare predictions of CFD using the exact geometry. This study yields quantitative data on the build quality of the LAM process, providing more insight as to whether it is a viable option for manufacture of micro-features in current turbine blade production.
Show less - Date Issued
- 2016
- Identifier
- CFE0006452, ucf:51428
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006452
- Title
- Modeling Mass Transfer and Assessing Cost and Performance of a Hollow Fiber Nanofiltration Membrane Process.
- Creator
-
Yonge, David, Duranceau, Steven, Sadmani, A H M Anwar, Lee, Woo Hyoung, Clausen, Christian, University of Central Florida
- Abstract / Description
-
Bench-scale water treatment testing of three next generation hollow-fiber (HF) nanofiltration (NF) membranes was conducted to characterize divalent ion rejection capabilities and investigate removal mechanisms. Existing mathematical models were investigated to describe solute transport using synthetic magnesium sulfate solutions including the size exclusion model, homogenous solution diffusion (HSD) model, dimensional analysis, and the HSD model incorporating film theory. Solute transport for...
Show moreBench-scale water treatment testing of three next generation hollow-fiber (HF) nanofiltration (NF) membranes was conducted to characterize divalent ion rejection capabilities and investigate removal mechanisms. Existing mathematical models were investigated to describe solute transport using synthetic magnesium sulfate solutions including the size exclusion model, homogenous solution diffusion (HSD) model, dimensional analysis, and the HSD model incorporating film theory. Solute transport for two of the membranes were described by HSD theory and were predictive of their 90% divalent ion removal. A third membrane was more accurately modeled using size exclusion and was found to be predictive of its 40% divalent ion rejection. Feed ionic strength variation was shown to significantly impact rejection. In this work, semi-empirical models were developed to describe solute transport under varying feed ionic strength conditions. Bench-scale testing of aerated groundwater confirmed the HFNF membrane divalent ion rejection capabilities. Pilot testing of a commercially available HFNF membrane was shown to remove divalent ions and dissolved organic carbon (DOC) by 10% and 25%, respectively. Financial evaluations indicated that HFNF offered cost savings over traditional spiral-wound (SW) NF, $0.60/kgal versus $0.85/kgal operating costs, respectively. Traditional SWNF membranes produced superior water quality achieving 90% divalent ion removal and 96% DOC removal but required media and membrane filtration pretreatment. When considering the costs of constructing a new 2 million gallon per day (permeate) HFNF process, conceptual cost comparisons revealed that HFNF technologies could reduce capital costs by approximately $1 million, and operating costs by $0.27/kgal for an 85% recovery plant.
Show less - Date Issued
- 2016
- Identifier
- CFE0006549, ucf:51346
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006549
- Title
- Moral Judgment Development of Student Nurses in an Associate Degree in Nursing Program.
- Creator
-
Way, Graciela, Cintron Delgado, Rosa, Owens, J. Thomas, Olan, Elsie, Welch, Kerry, Cicotti, Cheryl, University of Central Florida
- Abstract / Description
-
This study explored the correlation between the development of moral judgment and the variables of gender, age, primacy of religion, level of educational attainment, and year in the nursing program student nurses enrolled in an associate degree in nursing program who were concurrently enrolled in a bachelor degree in nursing program in the southern United States. A correlation was established with the dependent variable, or N2 index score, and the independent variable, primacy of religion. A...
Show moreThis study explored the correlation between the development of moral judgment and the variables of gender, age, primacy of religion, level of educational attainment, and year in the nursing program student nurses enrolled in an associate degree in nursing program who were concurrently enrolled in a bachelor degree in nursing program in the southern United States. A correlation was established with the dependent variable, or N2 index score, and the independent variable, primacy of religion. A negative correlation between the N2 index was established in students who believed that religion exerted a great influence on their lives while a positive correlation was established between the N2 index score and students who believed that religion exerted no influence on their lives. One conclusion reached was that the freshman class had a higher number of respondents who did not feel that religion was important in their lives with higher N2 index scores and a larger number of students in the Postconventional Schema of Moral Judgment. Regarding recommendations, it was suggested that ethical instruction needs to move beyond merely teaching students' ethical theories and shift towards instruction in situationally-dependent, context-driven, real-world management of ethical predicaments in practice.
Show less - Date Issued
- 2016
- Identifier
- CFE0006195, ucf:51092
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006195
- Title
- A Study of a Third Grade Summer Reading Camp: Its Promotion of Student Achievement and Its Cost Effectiveness.
- Creator
-
Bixler, Krista, Murray, Barbara, Murray, Kenneth, Taylor, Rosemarye, Baldwin, Gordon, University of Central Florida
- Abstract / Description
-
The purpose of this study was to determine the immediate and long term impact of participation in the 2009 Third Grade Summer Reading Camp, as well as determine the cost-effectiveness of providing this program in comparison to the cost-effectiveness of other reading interventions as identified by Yeh (2010). All students in this study scored an achievement level one on the 2009 FCAT Reading assessment and either attended the summer reading camp or received a good cause exemption for promotion...
Show moreThe purpose of this study was to determine the immediate and long term impact of participation in the 2009 Third Grade Summer Reading Camp, as well as determine the cost-effectiveness of providing this program in comparison to the cost-effectiveness of other reading interventions as identified by Yeh (2010). All students in this study scored an achievement level one on the 2009 FCAT Reading assessment and either attended the summer reading camp or received a good cause exemption for promotion to the next grade level. Data was not available to determine immediate impact of summer school. To determine long term impact of summer school participation, 130 students who attended the program and passed were compared to a random sample of 130 students who received another good cause exemption. Results of an independent t-test indicated students who passed summer school by performing at or above the 50th percentile on the alternative assessment outperformed students who received another good cause exemption on the 2010 FCAT Reading assessment, t(258) = -9.50, p = .000, effect size r = 0.51,and 2011 FCAT Reading assessment, t(258) = -7.43, p = .000, effect size r = 0.42. Ninety percent of students who attended summer school and passed the alternative assessment for promotion made learning gains on the following year's FCAT Reading assessment; however, the majority of students performed below grade level on the 2010 and 2011 FCAT Reading assessment. Based on school district records for the cost of salaries, benefits, transportation, materials, and supplies, the total cost of summer school was calculated and adjusted for inflation to 2006 dollars so a comparison could be made to Yeh's (2010) cost-effectiveness analysis of summer school and other reading interventions that annualized the cost to 2006 dollars. The adjusted cost for the 2009 summer reading program was calculated at $872,681.23. Using this number and dividing by the total number of summer school student, which were 3,012 students, the cost per student annualized to 2006 was $289.74. Data to determine the immediate impact of summer school were not available, therefore, student performance on the 2009 FCAT Reading assessment was compared to their performance on the 2010 FCAT Reading assessment by calculating a paired samples t-test, t(1225) = 40.82, p = .000, d = 1.23, effect size r = 0.52. The effect size d was divided by the cost per student which calculated an effectiveness-cost ratio of 0.004245 compared to that derived by Yeh (2010) of 0.000125. Caution should be taken when interpreting these results as methodology was not in alignment to Yeh (2010) due to the lack of an immediate post-test measure after participation in summer school and an additional year of interventions and education is reflected in the test scores. The cost per student was calculated to be $1,225.26 less than the amount of money reported in Yeh's (2010) calculations. Based on this information, the diminishing effect of the summer school program on student reading performance in subsequent years, and the majority of students performing below grade level one and two years after summer school participation, it cannot be determined that this program is cost-effective in raising student reading achievement.It is recommended that this study be replicated with adjustments made to address the limitations identified. Further investigation should be made at the state level to determine if the current practice of good cause exemptions and summer school offerings perpetuates the achievement gap in reading.?
Show less - Date Issued
- 2013
- Identifier
- CFE0004818, ucf:49753
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004818
- Title
- The Effect of Habitat for Humanity Homeownership on Student Attendance and Standardized Test Scores in Orange County Florida School District.
- Creator
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Harris, Charles, Kincaid, John, Uddin, Nizam, Rivers, Kenyatta, Wiegand, Rudolf, University of Central Florida
- Abstract / Description
-
The mobility of low-income students who do not have access to stable housing creates numerous challenges both at home and in school. Among these challenges, academic performance certainly is one of the most important. The lack of a more permanent, familiar, and safe environment is presumed to impact home life as well as students' performance in the classroom. This research compares two groups of current and former students of Orange County Public Schools (OCPS) in Florida (1) children of...
Show moreThe mobility of low-income students who do not have access to stable housing creates numerous challenges both at home and in school. Among these challenges, academic performance certainly is one of the most important. The lack of a more permanent, familiar, and safe environment is presumed to impact home life as well as students' performance in the classroom. This research compares two groups of current and former students of Orange County Public Schools (OCPS) in Florida (1) children of families who are Habitat for Humanity (HFH) homeowners, and (2) a matched socioeconomic control group. The HFH program is designed to provide a stable, affordable housing for families who cannot acquire it through standard means. The research question is: Does stability in housing make an impact on academic performance in the particular area of FCAT scores and attendance? Data were gathered from OCPS and the HFH homeowners themselves. This data were used to evaluate the impact of HFH homeownership on students' academic environment. Results showed better attendance at school, but HFH students fared worse in FCAT performance when compared to control group especially in reading.
Show less - Date Issued
- 2014
- Identifier
- CFE0005504, ucf:50360
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005504
- Title
- The Effect of Allocated Assessment Time and Allocated Instructional Time on Student Achievement in Small, Medium, and Large School Districts in Florida.
- Creator
-
Crupi, Samuel, Jeanpierre, Bobby, Gresham, Gina, Haciomeroglu, Erhan, University of Central Florida
- Abstract / Description
-
To date, there is little current research which explores the effect of allocated assessment time and allocated instructional time as related to student achievement (Spanjers, Burns, (&) Wagner, 2008). Current educational reform has placed accountability and assessment at the forefront of public education (Hirsh, 2007; Jennings, 2012; Kallemeyn, 2009; NCLB, 2001; Supovitz, 2009). Research of time on task has demonstrated that there may be a positive correlation between the amount of time on...
Show moreTo date, there is little current research which explores the effect of allocated assessment time and allocated instructional time as related to student achievement (Spanjers, Burns, (&) Wagner, 2008). Current educational reform has placed accountability and assessment at the forefront of public education (Hirsh, 2007; Jennings, 2012; Kallemeyn, 2009; NCLB, 2001; Supovitz, 2009). Research of time on task has demonstrated that there may be a positive correlation between the amount of time on task in learning activities and student achievement (Fredricks, McColskey, Meli, Mordica, Montrosse, (&) Mooney, (2011). There is current legislation to increase the time demands of assessment and the resulting decrease of allocated instructional time may result in lower levels of student achievement (Butler, 1926; 1936; Brophy, Rohrkemper, Rashid, (&) Goldwater, 1982; Carroll, 1963; Doppelt, Mehalik, Schunn, Silk, (&) Krysinski, 2008; Spanjers, Burns, (&) Wagner, 2008; Wyss, Dolenc, Kong, (&) Tai, 2013). The purpose of this study was to compare allocated assessment time to allocated instructional time in small, medium, and large school districts in Florida. A sample of 12 school districts was selected representing small, medium, and large school districts based on student enrollment from Florida Education Finance Plan (FEFP) data. Data related to State and school district mandated assessments were collected for each school district using school district testing calendars and State assessment calendars. These data were examined and the number of minutes spent on each assessment was calculated. The calculation was used to determine the amount of time spent on State and school district mandated assessment. Allocated instructional time was calculated using the difference in allocated time and allocated assessment time. In addition, data were analyzed to determine what, if any, relationship existed between allocated assessment time and school district size as well as student achievement. Time lost to assessment preparation was also included in the determination of allocated assessment time.
Show less - Date Issued
- 2015
- Identifier
- CFE0005777, ucf:50056
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005777
- Title
- INTERDIFFUSION BEHAVIOR OF U-MO ALLOYS IN CONTACT WITH AL AND AL-SI ALLOYS.
- Creator
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Perez, Emmanuel, Sohn, Yong-Ho, University of Central Florida
- Abstract / Description
-
U-Mo dispersion and monolithic fuels embedded in Al-alloy matrix are under development to fulfill the requirements of research reactors to use low-enriched molybdenum stabilized uranium alloys as fuels. The system under consideration in this study consisted of body centered cubic (gamma) U-Mo alloys embedded in an Al structural matrix. Significant interaction has been observed to take place between the U-Mo fuel and the Al matrix during manufacturing of the fuel-plate system assembly and...
Show moreU-Mo dispersion and monolithic fuels embedded in Al-alloy matrix are under development to fulfill the requirements of research reactors to use low-enriched molybdenum stabilized uranium alloys as fuels. The system under consideration in this study consisted of body centered cubic (gamma) U-Mo alloys embedded in an Al structural matrix. Significant interaction has been observed to take place between the U-Mo fuel and the Al matrix during manufacturing of the fuel-plate system assembly and during irradiation in reactors. These interactions produce Al-rich phases with physical and thermal properties that adversely affect the performance of the fuel system and can lead to premature failure. In this study, interdiffusion and microstructural development in the U-Mo vs. Al system was examined using solid-to-solid diffusion couples consisting of U-7wt.%Mo, U-10wt.%Mo and U-12wt.%Mo vs. pure Al, annealed at 600°C for 24 hours. The influence of Si alloying addition (up to 5 wt.%) in Al on the interdiffusion microstructural development was also examined using solid-to-solid diffusion couples consisting of U-7wt.%Mo, U-10wt.%Mo and U-12wt.%Mo vs. pure Al, Al-2wt.%Si, and Al-5wt.%Si annealed at 550°C for 1, 5 and 20 hours. To further clarify the diffusional behavior in the U-Mo-Al and U-Mo-Al-Si systems, Al-rich 85.7Al-11.44U-2.86Mo, 87.5Al-10U-2.5Mo, 56.1Al-18.9Si-21.9U-3.1Mo and 69.3Al-11.9Si-18.8U (at.%) alloys were cast and homogenized at 500°C to determine the equilibrium phases of the system. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron probe microanalysis (EPMA) and X-ray diffraction (XRD) were employed to examine the phase development in the diffusion couples and the cast alloys. In ternary U-Mo-Al diffusion couples annealed at 600°C for 24 hours, the interdiffusion microstructure consisted of finely dispersed UAl3, UAl4, U6Mo4Al43, and UMo2Al20 phases while the average composition throughout the interdiffusion zone remained constant at approximately 80 at.% Al. The interdiffusion microstructures observed by EPMA, SEM and TEM analyses were correlated to explain the observed morphological development in the interdiffusion zones. The concept of thermodynamic degrees of freedom was used to justify that, although deviations are apparent, the interdiffusion zones did not significantly deviate from an equilibrium condition in order for the observed microstructures to develop. Selected diffusion couples developed periodic bands within the interdiffusion zone as sub-layers in the three-phase regions. Observation of periodic banding was utilized to augment the hypothesis that internal stresses play a significant role in the phase development and evolution of U-Mo vs. pure Al diffusion couples. The addition of Si (up to 5 wt.%) to the Al significantly reduced the growth rate of the interdiffusion zone. The constituent phases and composition within the interdiffusion zone were also modified. When Si was present in the Al terminal alloys, the interdiffusion zones developed layered morphologies with fine distributions of the (U,Mo)(Al,Si)3 and UMo2Al20 phases. The U6Mo4Al43 phase was observed scarcely in Si depleted regions within the interdiffusion zone. The phase development and evolution of the interdiffusion zone was described in terms of thermodynamic degrees of freedom with minimal deviations from equilibrium.
Show less - Date Issued
- 2011
- Identifier
- CFE0003747, ucf:48778
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003747
- Title
- AN INVESTIGATION INTO THE APPARENT OVER-REPRESENTATION OF BLACKS IN EDUCABLE MENTALLY HANDICAPPED PROGRAMS IN K-12 SCHOOLS WITHIN THE 67 FLORIDA PUBLIC SCHOOL DISTRICTS.
- Creator
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Thomson, Arlene H., Murray, Barbara, University of Central Florida
- Abstract / Description
-
Placement into educable mentally handicapped (EMH) programs is necessary for some students in order to allow them the opportunity to receive an education appropriate for their special needs. Nonetheless, identification as EMH is often perceived as negative and demeaning. Decades of research have substantiated the over-representation of black students into certain categories of special education, including EMH, in comparison to white and Hispanic students. This disparity has raised questions...
Show morePlacement into educable mentally handicapped (EMH) programs is necessary for some students in order to allow them the opportunity to receive an education appropriate for their special needs. Nonetheless, identification as EMH is often perceived as negative and demeaning. Decades of research have substantiated the over-representation of black students into certain categories of special education, including EMH, in comparison to white and Hispanic students. This disparity has raised questions within schools, academe and research communities, and legislative and governing bodies as to the causes, compelling factors, and related variables impacting the phenomenon. This study investigated the apparent over-representation of blacks identified as EMH in the 67 public school districts in Florida in 2001-2002. It also analyzed the effects certain school district characteristics had on the identification of white, black, and Hispanic students as EMH. Analysis of data derived from the Florida Department of Education database for school year 2001-2002 led to the following findings: (1) there was over-representation of blacks in EMH within the 67 public school districts in Florida, since results showed that blacks were identified as EMH 2.5 times more often than whites and Hispanics; (2) socioeconomic status of school districts had a significant effect on the identification of black students as EMH,for example, when the school district was identified as a high socioeconomic status district, there was a greater likelihood that a larger proportion of black students would be identified as EMH; (3) as the wealth of school districts rose, there was a significant likelihood that the proportion of black students identified as EMH would also rise; (4) black students had a greater likelihood of being identified as EMH in suburban school districts; (5) blacks were over-identified in school districts that had 60,000 to 89,000 students; (6) when there was a high percentage of white, full-time, non-instructional staff (80% or more) in school districts, blacks had a greater likelihood of being over-identified as EMH; (7) blacks were three times more likely to be identified as EMH regardless of the type of degrees teachers had; and, (8) as district expenditure per student (FTE) increased, the tendency for over-identification of blacks as EMH decreased. For every variable analyzed, the proportion of black students identified as EMH was significant when compared to the proportions of white and Hispanic students also identified as EMH.
Show less - Date Issued
- 2004
- Identifier
- CFE0000004, ucf:46121
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000004
- Title
- EQUIBIAXIAL FLEXURAL STRENGTH TESTING OF ADVANCE CERAMICS.
- Creator
-
Jordan, Ryan T, Orlovskaya, Nina, Kwok, Kawai; Ghosh, Ranajay, University of Central Florida
- Abstract / Description
-
Ceramics are very important materials with many unique properties used in numerous industrial applications. Ceramics could be very hard and very strong in comparison to metals; however, they are very brittle, thus they are prone to instantaneous and catastrophic failure. Therefore, their reliability is compromised and it is very important to have advanced techniques that allow evaluating their mechanical behavior in many unusual stress states. One of such testing methods is biaxial strength...
Show moreCeramics are very important materials with many unique properties used in numerous industrial applications. Ceramics could be very hard and very strong in comparison to metals; however, they are very brittle, thus they are prone to instantaneous and catastrophic failure. Therefore, their reliability is compromised and it is very important to have advanced techniques that allow evaluating their mechanical behavior in many unusual stress states. One of such testing methods is biaxial strength method, that allows to measure properties not only unidirectional, but also in a biaxial way. The research work for this thesis will be built on design and development of ring-on-ring test jigs that will measure a biaxial strength of thin ceramic disks.
Show less - Date Issued
- 2018
- Identifier
- CFH2000386, ucf:45700
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH2000386
- Title
- THE RELATIONSHIP BETWEEN SCHOOL CULTURE AND THIRD-GRADE FCAT READING PROFICIENCY IN SEMINOLE COUNTY PUBLIC ELEMENTARY SCHOOLS.
- Creator
-
Novak, Kelley, Taylor, Rosemarye, University of Central Florida
- Abstract / Description
-
ABSTRACT This study aimed to determine the relationship between school culture and student achievement. Elementary school teachers (N=574) from 27 schools in suburban Seminole County, Florida completed the School Culture Triage Survey to generate a school culture score. The participating schools were ranked and placed in categories representing the top 33% (N=9), middle 33% (N=9), and bottom 33% (N=9) of the population based on their culture score. School culture data were analyzed and...
Show moreABSTRACT This study aimed to determine the relationship between school culture and student achievement. Elementary school teachers (N=574) from 27 schools in suburban Seminole County, Florida completed the School Culture Triage Survey to generate a school culture score. The participating schools were ranked and placed in categories representing the top 33% (N=9), middle 33% (N=9), and bottom 33% (N=9) of the population based on their culture score. School culture data were analyzed and correlated with third grade student achievement data, as measured by the 2007 Florida Comprehensive Assessment Test (FCAT) Reading to determine if there were any relationships between (a) school culture and student achievement; (b) the three key components of school culture (collaboration, collegiality, and self-determination/efficacy) and student achievement; and (c) principal tenure and school culture. Additional data analysis served to determine if there were any experiential or demographic differences among the teachers from the schools falling in the top, middle, and bottom 33% on the School Culture Triage Survey. To learn more about principal beliefs with regard to school culture and student achievement, principal interviews were conducted with some principals (N=8) from the participating schools. Through a review of the research results and related literature, the researcher concluded that a relationship between the overall school culture and student achievement did not exist. Further analysis revealed that there were no relationships between student achievement and collaboration, collegiality, and self-determination/efficacy, or between school culture and principal tenure for the schools participating in this study.
Show less - Date Issued
- 2008
- Identifier
- CFE0002241, ucf:47889
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002241
- Title
- Digital Education: The Impact of Change, Acceleration, and Student Achievement Improvement.
- Creator
-
Walsh, Sarah, Olan, Elsie, Puig, Enrique, Jeanpierre, Bobby, Damico, Nicole, University of Central Florida
- Abstract / Description
-
The aim is to understand if the implementation plan in place by the public school system is exceeding the expectations of the stakeholders or if it is falling below what is expected. This quantitative research examines the English Language Arts (ELA), Florida Standard Assessment (FSA) scores for the state of Florida with a closer inspection of Orange County Public Schools (OCPS) with relation to their digital implementation plan. With an increase in digital technology and amplified emphasis...
Show moreThe aim is to understand if the implementation plan in place by the public school system is exceeding the expectations of the stakeholders or if it is falling below what is expected. This quantitative research examines the English Language Arts (ELA), Florida Standard Assessment (FSA) scores for the state of Florida with a closer inspection of Orange County Public Schools (OCPS) with relation to their digital implementation plan. With an increase in digital technology and amplified emphasis on technology-based learning, the objective of this research was to determine what impact students and schools are experiencing in regards to test scores after the first year of implementation. Data reflects a decrease in gains in relation to ELA test scores, specifically within the year of implementation of technology. With the knowledge of this information the conversation needs to be started about what needs to be done to help this from becoming a permanent issue. There needs to be an allotment for adjustments to allow for the inclusion of strategies to assist in the minimizing of the achievement gap.
Show less - Date Issued
- 2019
- Identifier
- CFE0007740, ucf:52396
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007740
- Title
- The Moral Reasoning and Moral Decision Making of Urban High-Poverty Elementary School Principals in a Large Urban Southeastern School District.
- Creator
-
Strenth, Robert, Murray, Barbara, Taylor, Rosemarye, Murray, Kenneth, Hayes, Burnice, University of Central Florida
- Abstract / Description
-
The focus of this research was to identify the moral reasoning and moral judgment of elementary school principals who serve in high-poverty schools. The study was undertaken at the request of the client public school district who was attempting to identify characteristics of current elementary principals serving in high-poverty schools. Two research questions guided this study concerning the moral operational level of the principals. The theoretical framework of the study was based on the...
Show moreThe focus of this research was to identify the moral reasoning and moral judgment of elementary school principals who serve in high-poverty schools. The study was undertaken at the request of the client public school district who was attempting to identify characteristics of current elementary principals serving in high-poverty schools. Two research questions guided this study concerning the moral operational level of the principals. The theoretical framework of the study was based on the work of Lawrence Kohlberg and his stages of moral development. Participating principals were administered the Defining Issues Test-2 (DIT-2), a pencil-paper questionnaire that presented five moral dilemmas and a series of statements asking for the participant to rank solutions to the dilemmas. The results indicated that the majority of participants operated from lower levels of moral development, reasoning, and judgment. Participants' scores were matched with their schools' performance grades. There was not an indication that high moral scores and high school performance were linked. This study confirmed the results of an early study conducted by Vitton and Wasonga (2009) and encourages a deeper examination of the results of accountability and principal decision making.
Show less - Date Issued
- 2013
- Identifier
- CFE0004943, ucf:49609
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004943
- Title
- Comparing the Receptive Vocabulary Knowledge of Intermediate-level Students of Different Native languages in an Intensive English Program.
- Creator
-
Alkhofi, Anas, Folse, Keith, Mihai, Florin, Purmensky, Kerry, Xu, Lihua, University of Central Florida
- Abstract / Description
-
Because most(-)if not all(-)intensive English programs (IEP) assign students to specific levels based on a placement test that does not involve any form of explicit vocabulary testing, some degree of variation in lexical knowledge of students within an individual class should not be surprising. However, very little research has ever quantified this variation. The current study fills the gap in this important area of TESOL research by investigating vocabulary variation among intermediate-level...
Show moreBecause most(-)if not all(-)intensive English programs (IEP) assign students to specific levels based on a placement test that does not involve any form of explicit vocabulary testing, some degree of variation in lexical knowledge of students within an individual class should not be surprising. However, very little research has ever quantified this variation. The current study fills the gap in this important area of TESOL research by investigating vocabulary variation among intermediate-level students at one IEP. Participants (N=79) were split into two main proficiency groups, high intermediate (N=28) and low intermediate (N=51). The 2K, 3K, and 5K levels from the Vocabulary Levels Test (VLT) were used as a vocabulary measure. In this study, VLT scores were analyzed by proficiency level and by students' original individual classes (N=7). The results revealed considerable vocabulary variation. In some instances, vocabulary size varied by 900 word families per student. First language influence was also investigated by comparing the largest two language groups in the sample, Arabic (N= 28) and Spanish (N=12). Spanish-speaking students significantly outperformed the Arabic speaking students in all vocabulary measures (except for the 2K level). The study, therefore, raises questions about the approaches used in teaching a class that has both Spanish and Arabic speakers. Implications and suggestions for further studies are discussed.
Show less - Date Issued
- 2015
- Identifier
- CFE0005569, ucf:50281
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005569
- Title
- Creating and Examining an Online Advising Module for Graduate Students: A Usability Study.
- Creator
-
Mitchell, Leah, Flammia, Madelyn, Jones, Daniel, Dombrowski, Paul, University of Central Florida
- Abstract / Description
-
Advisors are always examining best practices when serving students with technology. Online instruction has become a popular choice for students in higher education, and educators and other student personnel are looking to further accommodate their students by including academic services as part of a virtual environment.This study examines the usefulness of an online advising module geared at graduate students. I conducted a usability study of an online advising module created for graduate...
Show moreAdvisors are always examining best practices when serving students with technology. Online instruction has become a popular choice for students in higher education, and educators and other student personnel are looking to further accommodate their students by including academic services as part of a virtual environment.This study examines the usefulness of an online advising module geared at graduate students. I conducted a usability study of an online advising module created for graduate students in the College of Education and Human Performance (CEDHP) at the University of Central Florida. The online advising module was presented to current graduate students in the CEDHP. They were asked to make observations and provide feedback about their interactions with the online advising module. The final part of the usability test included giving students a survey to rate their overall satisfaction with the module.Results of the study showed that graduate students did benefit from viewing the online advising module. Participants reported an overall strong satisfaction rate with the module.
Show less - Date Issued
- 2014
- Identifier
- CFE0005212, ucf:50621
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005212
- Title
- MUSIC STANDARDS IMPLEMENTATION AND THE RELATIONSHIP TO FOURTH GRADE FLORIDA COMPREHENSIVE ASSESSMENT TEST SCORES FROM 2004 TO 2006.
- Creator
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Phillips, Neal, Taylor, Rosemarye, University of Central Florida
- Abstract / Description
-
This study examined the possible relationships among the perceived implementation levels of elementary music standards and Florida Comprehensive Assessment Test (FCAT) scores for fourth graders in reading, mathematics, and writing for the years 2004, 2005, and 2006. Survey data for the study were obtained from 32 school district music supervisors from large, medium, and small districts who returned fully or partially completed questionnaires. The study was focused on the relationships, if any...
Show moreThis study examined the possible relationships among the perceived implementation levels of elementary music standards and Florida Comprehensive Assessment Test (FCAT) scores for fourth graders in reading, mathematics, and writing for the years 2004, 2005, and 2006. Survey data for the study were obtained from 32 school district music supervisors from large, medium, and small districts who returned fully or partially completed questionnaires. The study was focused on the relationships, if any, between a school district's mean scale scores in reading, mathematics, and writing from 2004 to 2006 in grade 4 and (a) elementary music standards implementation, (b) the average amount of time spent in elementary school music classes per week, (c) demographic and economic factors, and (d) the reported average amount of time spent in elementary school music classes per week. Findings of the study indicated that, when all variables were considered, a relationship existed among district music supervisors' views on two variables, degree of music standards implementation and the amount of time allotted per month for elementary music in respondents' school districts in 2004, 2005, and 2006; and (a) the percentage of students achieving at proficient or higher on FCAT reading who were also identified as free and reduced lunch in 2004, 2005, and 2006, (b) the percentage of students achieving at proficient or higher on FCAT mathematics who were also identified as free and reduced lunch in 2004, 2005, and 2006, and (c) the percentage of students achieving at proficient or higher on FCAT writing who were also identified as Hispanic in 2004, 2005, and 2006. Finally, implications for educational decision making were offered and recommendations were made for future studies dealing with elementary music standards implementation in Florida's schools. These recommendations included (a) investigating reasons for achievement gaps on FCAT between majority and minority ethnic groups and between minorities themselves, (b) exploring socio-economic factors affecting FCAT scores, (c) continuing research giving special attention to brain research involving music and its impact on the brain, (d) determining why high-stakes testing is necessary, and (e) devising controlled studies both in Florida and nationwide that would compare the elementary students receiving consistent and varied teaching in music with those students not receiving consistent musical instruction. Controlled and experimental group studies of pre-schoolers should be conducted to determine the extent to which the use of musical rhythms impacts the rate of language acquisition.
Show less - Date Issued
- 2008
- Identifier
- CFE0002063, ucf:47566
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0002063
- Title
- A FAITH-BASED PROGRAM EVALUATION: MORAL DEVELOPMENT OF SEMINARY STUDENTS AT THE LOUISIANA STATE PENITENTIARY.
- Creator
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Sabin, Bruce, Tubbs, LeVester, University of Central Florida
- Abstract / Description
-
The purpose of this dissertation was to conduct an outcomes-based program evaluation for the Louisiana State Penitentiary (Angola) campus of the New Orleans Baptist Theological Seminary. The study included one primary research question, with two subquestions. The primary research question asked to what extent students in the program developed moral judgment consistent with program goals of rehabilitating students and preparing them for effective ministry. The first subquestion asked whether...
Show moreThe purpose of this dissertation was to conduct an outcomes-based program evaluation for the Louisiana State Penitentiary (Angola) campus of the New Orleans Baptist Theological Seminary. The study included one primary research question, with two subquestions. The primary research question asked to what extent students in the program developed moral judgment consistent with program goals of rehabilitating students and preparing them for effective ministry. The first subquestion asked whether statistically significant differences existed in the moral reasoning of students of different class years. The second subquestion asked whether statistically significant differences existed in the moral reasoning of students of different personality types. A cross-sectional study was conducted with students during the fall of 2005 using the Defining Issues Test 2 (DIT-2) and the Myers-Briggs Type Indicator (MBTI) instruments. All 101 program students were invited to participate in the study. To provide a benchmark for student scores, 30 Seminary faculty members were asked to complete the DIT-2. The student response rates were 94% for the DIT-2 instrument and 97% for the MBTI instrument. The response rate for faculty was 20%. After removing two outliers from the freshmen class, statistically significant differences were found in the principled moral reasoning scores (P scores) of freshmen (m = 22.146, sd = 12.002) and juniors (m = 30.274, sd = 13.165). No significant differences were found in moral reasoning based upon personality types. The mean P score among faculty members was 34.02 (sd = 15.25). In response to the primary research question, it was determined student scores did show moral reasoning differences consistent with the program goals. Conclusions reached in this study were limited because of the cross-sectional design. Further research is necessary before conclusions may be generalized beyond the sample.
Show less - Date Issued
- 2006
- Identifier
- CFE0001039, ucf:46795
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001039
- Title
- Real-time SIL Emulation Architecture for Cooperative Automated Vehicles.
- Creator
-
Gupta, Nitish, Pourmohammadi Fallah, Yaser, Rahnavard, Nazanin, Vosoughi, Azadeh, University of Central Florida
- Abstract / Description
-
This thesis presents a robust, flexible and real-time architecture for Software-in-the-Loop (SIL) testing of connected vehicle safety applications. Emerging connected and automated vehicles (CAV) use sensing, communication and computing technologies in the design of a host of new safety applications. Testing and verification of these applications is a major concern for the automotive industry. The CAV safety applications work by sharing their state and movement information over wireless...
Show moreThis thesis presents a robust, flexible and real-time architecture for Software-in-the-Loop (SIL) testing of connected vehicle safety applications. Emerging connected and automated vehicles (CAV) use sensing, communication and computing technologies in the design of a host of new safety applications. Testing and verification of these applications is a major concern for the automotive industry. The CAV safety applications work by sharing their state and movement information over wireless communication links. Vehicular communication has fueled the development of various Cooperative Vehicle Safety (CVS) applications. Development of safety applications for CAV requires testing in many different scenarios. However, the recreation of test scenarios for evaluating safety applications is a very challenging task. This is mainly due to the randomness in communication, difficulty in recreating vehicle movements precisely, and safety concerns for certain scenarios. We propose to develop a standalone Remote Vehicle Emulator (RVE) that can reproduce V2V messages of remote vehicles from simulations or from previous tests, while also emulating the over the air behavior of multiple communicating nodes. This is expected to significantly accelerate the development cycle. RVE is a unique and easily configurable emulation cum simulation setup to allow Software in the Loop (SIL) testing of connected vehicle applications in a realistic and safe manner. It will help in tailoring numerous test scenarios, expediting algorithm development and validation as well as increase the probability of finding failure modes. This, in turn, will help improve the quality of safety applications while saving testing time and reducing cost.The RVE architecture consists of two modules, the Mobility Generator, and the Communication emulator. Both of these modules consist of a sequence of events that are handled based on the type of testing to be carried out. The communication emulator simulates the behavior of MAC layer while also considering the channel model to increase the probability of successful transmission. It then produces over the air messages that resemble the output of multiple nodes transmitting, including corrupted messages due to collisions. The algorithm that goes inside the emulator has been optimized so as to minimize the communication latency and make this a realistic and real-time safety testing tool. Finally, we provide a multi-metric experimental evaluation wherein we verified the simulation results with an identically configured ns3 simulator. With the aim to improve the quality of testing of CVS applications, this unique architecture would serve as a fundamental design for the future of CVS application testing.
Show less - Date Issued
- 2018
- Identifier
- CFE0007185, ucf:52280
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007185
- Title
- A comparison of eighth grade athletes and non-athletes: Academic achievement, time spent on homework, future educational goals, and socioeconomic status.
- Creator
-
Shelby, John, Taylor, Rosemarye, Hahs-Vaughn, Debbie, Doherty, Walter, Ford, Robert, University of Central Florida
- Abstract / Description
-
This study examined the differences between eighth grade athletes and non-athletes in terms of mathematics and reading achievement based on standardized test scores from direct cognitive assessments in mathematics and reading. The data for this study came from the Early Childhood Longitudinal Study Kindergarten Class of 1998-1999 (ECLS-K). Data were collected from student and parent surveys in conjunction with direct cognitive assessments. The research questions were as follows: 1. To what...
Show moreThis study examined the differences between eighth grade athletes and non-athletes in terms of mathematics and reading achievement based on standardized test scores from direct cognitive assessments in mathematics and reading. The data for this study came from the Early Childhood Longitudinal Study Kindergarten Class of 1998-1999 (ECLS-K). Data were collected from student and parent surveys in conjunction with direct cognitive assessments. The research questions were as follows: 1. To what extent is there a difference in mathematics achievement between eighth grade athletes and non-athletes while controlling for self-reported future educational goals and socioeconomic status?2. To what extent is there a difference in mathematics achievement between eighth grade athletes and non-athletes while controlling for self-reported weekly time spent on homework and socioeconomic status?3. To what extent is there a difference in reading achievement between eighth grade athletes and non-athletes while controlling for self-reported future educational goals and socioeconomic status?4. To what extent is there a difference in reading achievement between eighth grade athletes and non-athletes while controlling for self-reported weekly time spent on homework and socioeconomic status?Factorial ANOVA's were used answer each research question. An additional variable, gender, was utilized to further evaluate differences in mathematics and reading scale scores. Based upon the results, no statistical significance was found in the three-way interaction effects for any of the research questions. As the two-way and main effects comparisons were evaluated, statistical significance was indicated within each question based on the multiple independent variables. Overall, the athletes did not outscore non-athletes.There were consistent differences in mean scores in reading and mathematics based upon self-stated future educational goals where students maintained higher mean scores in reading and mathematics as their educational goals increased. In addition consistent differences in mean scores in reading and mathematics were indicated where students below the poverty level had lower mean scores than students at or above the poverty level. Finally, students' mathematics and reading achievement significantly increased as their self-reported weekly time spent on homework increased.
Show less - Date Issued
- 2011
- Identifier
- CFE0004166, ucf:49064
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004166
- Title
- The Effects of Phosphatidylserine on Reaction Time and Cognitive Function Following an Exercise Stress.
- Creator
-
Wells, Adam, Hoffman, Jay, Fragala, Maren, Stout, Jeffrey, University of Central Florida
- Abstract / Description
-
Phosphatidylserine (PS) is an endogenously occurring phospholipid that has been shown to have cognition and mood enhancing properties in humans, possibly through its role as an enzyme co-factor in cellular signal transduction. Specifically, PS has been identified as activator of classical isoforms of protein kinase C, an enzyme known to be involved in the growth and differentiation of neural cells, and is therefore thought to play a role in the protection of neurons.The purpose of this study...
Show morePhosphatidylserine (PS) is an endogenously occurring phospholipid that has been shown to have cognition and mood enhancing properties in humans, possibly through its role as an enzyme co-factor in cellular signal transduction. Specifically, PS has been identified as activator of classical isoforms of protein kinase C, an enzyme known to be involved in the growth and differentiation of neural cells, and is therefore thought to play a role in the protection of neurons.The purpose of this study was to examine the effects of supplementation with PS and caffeine on measures of cognition, reaction time and mood prior to and following an exercise stress. Twenty, healthy, resistance trained males (17) and females (3) (mean (&)#177; SD; age: 22.75 (&)#177; 3.27 yrs; height: 177.03 (&)#177; 8.44cm; weight: 78.98 (&)#177; 11.24kg; body fat%: 14.28 (&)#177; 6.6), volunteered to participate in this randomized, double-blind, placebo-controlled study. Participants were assigned to a PS group (400mg/day PS; 100mg/day caffeine, N=9) or PL (16g/day Carbs, N=11) delivered in the form of 4 candy chews identical in size, shape and color. Subjects performed an acute bout of full body resistance exercise, prior to (T1) and following 14 days of supplementation (T2). Measures of reaction time (Dynavision(&)#174; D2 Visuomotor Training Device), cognition (Serial Subtraction Test, SST), and mood (Profile of Mood States, POMS) were assessed immediately before and following resistance exercise in both T1 and T2. Data was analyzed using two-way ANCOVA and repeated measures ANOVA.Supplementation with 400mg PS and 100mg caffeine did not have a significant impact upon measures of reaction time or cognition between groups at baseline or following acute resistance exercise. However, there was a non-significant trend to the attenuation of fatigue between groups, following acute resistance exercise (p = 0.071). Interestingly, our data suggests that acute resistance exercise alone may improve cognitive function.Although more research is necessary regarding optimal dosage and supplementation duration, the current findings suggest that supplementation 400mg/day PS with 100mg/day caffeine may attenuate fatigue following acute resistance exercise. It is possible that the lack of significance may be the result of both an inhibition of the PS activated pathway and a withdrawal effect from caffeine.
Show less - Date Issued
- 2012
- Identifier
- CFE0004457, ucf:49325
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0004457
- Title
- PATTERNED CELL CULTURES FOR HIGH THROUGHPUT STUDIES OF CELL ELECTROPHYSIOLOGY AND DRUG SCREENING APPLICATIONS.
- Creator
-
Natarajan, Anupama, Hickman, James, University of Central Florida
- Abstract / Description
-
Over the last decade, the field of tissue and bio-engineering has seen an increase in the development of in vitro high-throughput hybrid systems that can be used to understand cell function and behavior at the cellular and tissue levels. These tools would have a wide array of applications including for implants, drug discovery, and toxicology, as well as for studying cell developmental behavior and as disease models. Currently, there are a limited number of efficient, functional drug...
Show moreOver the last decade, the field of tissue and bio-engineering has seen an increase in the development of in vitro high-throughput hybrid systems that can be used to understand cell function and behavior at the cellular and tissue levels. These tools would have a wide array of applications including for implants, drug discovery, and toxicology, as well as for studying cell developmental behavior and as disease models. Currently, there are a limited number of efficient, functional drug screening assays in the pharmacology industry and studies of cell-surface interactions are complicated and invasive. Most cell physiology studies are performed using conventional patch-clamp techniques or random networks cultured on silicon devices such as Microelectrode Arrays (MEAs) and Field Effect transistors (FETs). The objective of this study was to develop high-throughput in vitro platforms that could be used to analyze cell function and their response to various stimuli. Our hypothesis was that by utilizing surface modification to provide external guidance cues for various cell types and by controlling the cell environment in terms of culture conditions, we could develop an in vitro hybrid platform for sensing and testing applications. Such a system would not only give information regarding the surface effects on the growth and behavior of cells for implant development applications, but also allow for the study of vital cell physiology parameters like conduction velocity in cardiomyocytes and synaptic plasticity in neuronal networks. This study outlines the development of these in vitro high throughput systems that have varied applications ranging from tissue engineering to drug development. We have developed a simple and relatively high-throughput method in order to test the physiological effects of varying chemical environments on rat embryonic cardiac myocytes in order to model the degradation effects of polymer scaffolds. Our results, using our simple test system, are in agreement with earlier observations that utilized a complex 3D biodegradable scaffold. Thus, surface functionalization with self-assembled monolayers combined with histological/physiological testing could be a relatively high throughput method for biocompatibility studies and for the optimization of the material/tissue interface in tissue engineering. Traditional multielectrode extracellular recording methods were combined with surface patterning of cardiac myocyte monolayers to enhance the information content of the method; for example, to enable the measurement of conduction velocity, refractory period after action potentials or to create a functional reentry model. Two drugs, 1-Heptanol, a gap junction blocker, and Sparfloxacin, a fluoroquinone antibiotic, were tested in this system. 1-Heptanol administration resulted in a marked reduction in conduction velocity, whereas Sparfloxacin caused rapid, irregular and unsynchronized activity, indicating fibrillation. As shown in these experiments, the patterning of cardiac myocyte monolayers increased the information content of traditional multielectrode measurements. Patterning techniques with self-assembled monolayers on microelectrode arrays were also used to study the physiological properties of hippocampal networks with functional uni-directional connectivity, developed to study the mono-synaptic connections found in the dentate gyrus. Results indicate that changes in synaptic connectivity and strength were chemically induced in these patterned hippocampal networks. This method is currently being used for studying long term potentiation at the cellular level. For this purpose, two cell patterns were optimized for cell migration onto the pattern as demonstrated by time lapse studies, and for supporting the best pattern formation and cell survival on these networks. The networks formed mature interconnected spiking neurons. In conclusion, this study demonstrates the development and testing of in vitro high-throughput systems that have applications in drug development, understanding disease models and tissue engineering. It can be further developed for use with human cells to have a more predictive value than existing complex, expensive and time consuming methods.
Show less - Date Issued
- 2010
- Identifier
- CFE0003384, ucf:48437
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003384
