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Title: CLOSING THE ACHIEVEMENT GAP FOR ENGLISH LANGUAGE LEARNERS:A COMPARISON OF LANGUAGE ARTS/ESOL AND ONE-WAY DEVELOPMENTAL BILINGUAL PROGRAMS.
Creator: Marlow, Kimberly, Murray, Barbara, University of Central Florida
Abstract / Description: The present study was conducted to investigate two English Language Learner programs in one Florida county and their implications for student achievement. The literature review showed that, as students progress through the educational system, the academic content becomes more and more abstract, forcing students to rely more heavily on their oral and written communication skills in English. Significant achievement gaps, sometimes extremely large, were also identified between English-only...
Show moreThe present study was conducted to investigate two English Language Learner programs in one Florida county and their implications for student achievement. The literature review showed that, as students progress through the educational system, the academic content becomes more and more abstract, forcing students to rely more heavily on their oral and written communication skills in English. Significant achievement gaps, sometimes extremely large, were also identified between English-only students and English Language Learner students. One study highlighted a 46% gap on the 2005 National Assessment of Education Progress (NAEP). The present study was designed to investigate 23 middle schools in one Florida county. The focus of the study was on two English Language Learner programs: Language Arts/ESOL and One-Way Developmental Bilingual Education. A total of 13 schools were identified that had implemented the Language Arts/ESOL program, and 10 middle schools were identified that had implemented the One-Way Developmental Bilingual Education program. The 2007 FCAT reading mean scale scores for the schools' 7th-grade English Language Learners were compared to those of standard curriculum students. For both English Language Learner programs, a statistical significance was found using t-tests. In addition, FCAT reading Levels 1-5 were investigated. At FCAT Levels 1-3, the Language Arts/ESOL program out-performed the One-Way Developmental Bilingual Education program. At FCAT Levels 4 and 5, the One-Way Developmental Bilingual Education program out-performed the Language Arts/ESOL program.
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Date Issued: 2008
Identifier: CFE0002059, ucf:47582
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002059

Title: FORENSIC ANALYSIS OF AUTOMOBILE PAINTS BY ATOMIC AND MOLECULAR SPECTROSCOPIC METHODS AND STATISTICAL DATA ANALYSES.
Creator: McIntee, Erin, Sigman, Michael, University of Central Florida
Abstract / Description: The analysis of 110 automotive paint samples was conducted for the research presented here. Laser-induced breakdown spectroscopy (LIBS) was the central instrument utilized for analysis although scanning electron microscopy / energy dispersive x-ray spectroscopy (SEM/EDS) and Fourier transform infrared spectroscopy – attenuated total reflection (FTIR-ATR) analyses were also performed. Two separate methods of LIBS analysis of samples were used: a cross sectional analysis and a drill down...
Show moreThe analysis of 110 automotive paint samples was conducted for the research presented here. Laser-induced breakdown spectroscopy (LIBS) was the central instrument utilized for analysis although scanning electron microscopy / energy dispersive x-ray spectroscopy (SEM/EDS) and Fourier transform infrared spectroscopy – attenuated total reflection (FTIR-ATR) analyses were also performed. Two separate methods of LIBS analysis of samples were used: a cross sectional analysis and a drill down analysis. SEM/EDS analysis focused on the cross section while FTIR-ATR analysis concentrated on the clearcoat layer. Several different data/statistical analyses were evaluated including principal components analysis (PCA), two tailed t-tests based on several different metrics (Hit Quality Index (HQI), Pearson's correlation and Sorenson index), multivariate analysis of variance and receiver operating characteristic (ROC) curves. Full spectrum data analysis from LIBS spectra resulted in 99.7% discrimination between different sample comparisons and 12% between same sample comparisons based on HQI and t-tests. Peak analysis of LIBS spectra resulted in 87.5% discrimination between different sample comparisons and 5% between same sample comparisons based on MANOVA. When combining the results of the FTIR-ATR and SEM/EDS analyses, 88% of the samples could be discriminated.
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Date Issued: 2008
Identifier: CFE0002430, ucf:47739
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002430

Title: EFFECTS OF THE SOIL PROPERTIES ON THE MAXIMUM DRY DENSITY OBTAINED FROM THE STANDARD PROCTOR TEST.
Creator: Arvelo, Andres, Kuo, Shiou-san, University of Central Florida
Abstract / Description: In the construction of highways, airports, and other structures, the compaction of soils is needed to improve its strength. In 1933 Proctor developed a laboratory compaction test to determine the maximum dry density of compacted soils, which can be used for specifications of field compaction. The Compaction of soils is influenced by many factors, the most common are the moisture content, the soil type and the applied compaction energy. The objective of this research is the analysis of the...
Show moreIn the construction of highways, airports, and other structures, the compaction of soils is needed to improve its strength. In 1933 Proctor developed a laboratory compaction test to determine the maximum dry density of compacted soils, which can be used for specifications of field compaction. The Compaction of soils is influenced by many factors, the most common are the moisture content, the soil type and the applied compaction energy. The objective of this research is the analysis of the maximum dry density values based on the soil classification and characterization. The method of choice in the determination of the maximum dry density from different soils was the Standard Proctor Test following the procedure for the standard Proctor test as is explained in ASTM Test Designation D-698. From this investigation, the maximum dry density of eight types of sands was obtained, the sands were classified by using the Unified Soil Classification System. The influence on the maximum dry density of the type of sands, type of fines, amount of fines and distribution of the grain size was determined, followed by a sensitivity analysis that measured the influence of these parameters on the obtained maximum dry density. The research revealed some correlations between the maximum dry density of soils with the type of fines, the fines content and the Uniformity Coefficient. These correlations were measured and some particular behavioral trends were encountered and analyzed. It was found that well-graded sands have higher maximum dry density than poorly graded when the soils have the same fines content, also it was encountered that plastic fines tend to increase the maximum dry density.
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Date Issued: 2004
Identifier: CFE0000261, ucf:46237
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000261

Title: PREPARATION AND CHARACTERIZATION OF CIGSS SOLAR CELLS AND PV MODULE DATA ANALYSIS.
Creator: Shirolikar, Jyoti, Dhere, Neelkanth, University of Central Florida
Abstract / Description: In this thesis, multiple activities have been carried out in order to improve the process of CIGSS solar cell fabrication on a 4" x 4" substrate. The process of CIGSS solar cell fabrication at FSEC's PV Materials Lab involves a series of steps that were all carried out manually in the past. A LABVIEW program has been written to carry out automated sputter deposition of Mo back contact, CuGa, In metallic precursors on a soda lime glass substrate using a stepper motor control for better...
Show moreIn this thesis, multiple activities have been carried out in order to improve the process of CIGSS solar cell fabrication on a 4" x 4" substrate. The process of CIGSS solar cell fabrication at FSEC's PV Materials Lab involves a series of steps that were all carried out manually in the past. A LABVIEW program has been written to carry out automated sputter deposition of Mo back contact, CuGa, In metallic precursors on a soda lime glass substrate using a stepper motor control for better uniformity. Further, selenization/ sulfurization of these precursors was carried out using rapid thermal processing (RTP). CIGS films were sulfurized using chemical bath deposition (CBD). ZnO:Al was deposited on the CIGSS films using RF sputtering. A separate LABVIEW program was written to automate the process of ZnO:Al deposition. Ni/Al contact fingers were deposited on the ZnO:Al layer using the e-beam evaporation technique. Further, in order to test these solar cells in-house, a simple current-voltage (IV) tracer was fabricated using LABVIEW. A quantum efficiency (QE) measurement setup was built with guidance from the National Renewable Energy Laboratory (NREL). Lastly, analysis of data from photovoltaic (PV) modules installed on the FSEC test site has been carried out using a LABVIEW program in order to find out their rate of degradation as time progresses. A 'C' program has also been written as an aid for keeping a daily log of errors in data and for troubleshooting of the same.
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Date Issued: 2005
Identifier: CFE0000859, ucf:46645
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000859

Title: THE ASSOCIATION OF ATTACHMENT STYLE AND PERCEPTIONS OF CAREGIVER EXPERIENCE.
Creator: Luther, Kandace, Paulson, Daniel, University of Central Florida
Abstract / Description: This research examines caregiver experiences as they relate to attachment style. The overarching hypothesis is that perceptions of the caregiver role differ depending on the degree of avoidance and anxiousness in the caregiver's attachment style. Caregiver response was measured in the areas of filial obligation, work reduction, perceived control, caregiver burden, depressive symptomatology, and preparedness for caregiving. The final sample consisted of 150 caregivers who identified as the...
Show moreThis research examines caregiver experiences as they relate to attachment style. The overarching hypothesis is that perceptions of the caregiver role differ depending on the degree of avoidance and anxiousness in the caregiver's attachment style. Caregiver response was measured in the areas of filial obligation, work reduction, perceived control, caregiver burden, depressive symptomatology, and preparedness for caregiving. The final sample consisted of 150 caregivers who identified as the primary caregiver for a parent over the age of 65. This sample was recruited using Mechanical Turk, an online survey distribution tool. The survey was created online with Qualtrics software. Data were analyzed using SPSS software, and procedures primarily focused on correlational and descriptive statistics. The results revealed several significant correlations between attachment style and caregiver burden as well as depression, supporting the hypothesis that attachment style is associated with differences in perception of the caregiver experience. This research is motivated by the increasingly urgent need for caregiver support through financial aid, counseling services, and cohesive healthcare options.
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Date Issued: 2014
Identifier: CFH0004705, ucf:45408
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004705

Title: AN INVESTIGATION OF LINGUISTIC, COGNITIVE, AND AFFECTIVE FACTORS THAT IMPACT ENGLISH LANGUAGE LEARNERS' PERFORMANCE ON A STATE STANDARDIZED READING ACHIEVEMENT TEST.
Creator: Strebel Halpern, Carine, Nutta, Joyce, University of Central Florida
Abstract / Description: The explicit teaching of reading comprehension strategies has been proposed as a means to better prepare secondary school-aged students for today's information-dense, fast-paced, fast-changing global society, and to improve the academic performance of struggling adolescent readers. This proposition of a direct and positive impact of reading comprehension strategies on reading achievement for all students has not been investigated with English language learners (ELLs) who, by definition,...
Show moreThe explicit teaching of reading comprehension strategies has been proposed as a means to better prepare secondary school-aged students for today's information-dense, fast-paced, fast-changing global society, and to improve the academic performance of struggling adolescent readers. This proposition of a direct and positive impact of reading comprehension strategies on reading achievement for all students has not been investigated with English language learners (ELLs) who, by definition, do not possess the same level of English language skills as their native-English speaking peers. This mixed-method study investigated linguistic, cognitive, as well as affective factors that impact adolescent ELLs' performance on a standardized state reading achievement test. The quantitative portion examined the relative contributions of second language proficiency and reading comprehension strategies to a prediction model of reading achievement in 110 ninth and tenth grade ELLs. The qualitative portion of the study involved individual interviews and was aimed at deepening the understanding of ELLs' use of strategies during the standardized reading test, while also investigating affective factors that may impact their performance on this measure of academic achievement. Quantitative findings include two statistically significant prediction models of reading achievement with reading comprehension strategies and English language proficiency as predictor variables. However, only language proficiency made a significant unique contribution to the prediction variable. Qualitative findings suggest that the participants had relatively little metacognitive awareness of their comprehension during the standardized test, had overestimated their use of reading strategies as reported on a 30-item strategy survey instrument, had concentrated on sentence-level comprehension due to unknown vocabulary, and may have been hindered by testing anxiety in being able to wholly concentrate on the task. Recommendations made for the instruction of comprehension strategies consist of the raising of metacognitive awareness through the explicit modeling of the thought processes involved in reading comprehension, including determining the meaning of unknown words.
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Date Issued: 2009
Identifier: CFE0002931, ucf:47989
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002931

Title: TEACHER PERCEPTIONS OF THE ACHIEVEMENT OF STUDENTS WITH LEARNING DISABILITIES ON STATEWIDE ASSESSMENTS.
Creator: Gromoll, Maryann, Little, Mary, University of Central Florida
Abstract / Description: Each year as a growing number of students with learning disabilities are included in statewide assessments, teacher perceptions and beliefs toward student achievement are being identified and examined. The No Child Left Behind Act of 2001(NCLB) and the 2004 reauthorization of the Individuals with Disabilities Education Act (IDEA, 2004) raise the achievement expectations of students with disabilities and require that teachers are knowledgeable about state academic content and achievement...
Show moreEach year as a growing number of students with learning disabilities are included in statewide assessments, teacher perceptions and beliefs toward student achievement are being identified and examined. The No Child Left Behind Act of 2001(NCLB) and the 2004 reauthorization of the Individuals with Disabilities Education Act (IDEA, 2004) raise the achievement expectations of students with disabilities and require that teachers are knowledgeable about state academic content and achievement standards (Thompson, Lazarus, Clapper, & Thurlow, 2006). State departments of education are responsible to ensure that teacher competencies and expectations are specific to the achievement of grade level content standards (Thompson, et al., 2006). Educational reform, increased knowledge in the teacher-learning process, and greater access to the general education curriculum require changes in instructional practice. This study investigated special education teachers' perceptions, backgrounds and beliefs related to test performance of third grade students with learning disabilities who passed the reading portion of the state assessment in Florida, the Florida Comprehensive Assessment Test (FCAT). The comparative descriptive research design was used to identify these factors and their effects in the study (Creswell, 2002). Quantitative data collection was used. A survey instrument was developed to include information on teachers' background, beliefs, experience, and perceptions toward statewide assessments. The survey was sent to seventy six third grade teachers of students with learning disabilities. Teachers receiving the survey were categorized into two groups based on the outcome of the 2007 FCAT in reading. Significant differences between teacher responses were found in the areas of professional development for test accommodations, co-teaching, and working with professionals in the general curriculum. Response to survey items on service delivery models indicated that students who spend the majority of time in the general education classroom or in a resource room setting have increased student achievement on statewide assessments. Differences were also found between teachers on questions related to school location, percentage of minority students, students who are eligible for free and reduced lunch, and positions employees held in education by the teachers in the study. One of the most significant findings of this study concluded that increased time spent in the general education classroom and collaboration of special education teachers with general education staff proved to be most beneficial when addressing the needs of students with learning disabilities and statewide assessment. The concept of teacher knowledge base and continued awareness of perceptions andbeliefs addressed in this study allowed for further research investigations.
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Date Issued: 2008
Identifier: CFE0002299, ucf:47830
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002299

Title: INITIAL VALIDATION OF NOVEL PERFORMANCE-BASED MEASURES: MENTAL ROTATION AND PSYCHOMOTOR ABILITY.
Creator: Fatolitis, Philip, Jentsch, Florian, University of Central Florida
Abstract / Description: Given the high-risk nature of military flight operations and the significant resources required to train U.S. Naval Aviation personnel, continual improvement is required in the selection process. In addition to general commissioning requirements and aeromedical standards, the U.S. Navy utilizes the Aviation Selection Test Battery (ASTB) to select commissioned aviation students. Although the ASTB has been a good predictor of aviation student performance in training, it was proposed that...
Show moreGiven the high-risk nature of military flight operations and the significant resources required to train U.S. Naval Aviation personnel, continual improvement is required in the selection process. In addition to general commissioning requirements and aeromedical standards, the U.S. Navy utilizes the Aviation Selection Test Battery (ASTB) to select commissioned aviation students. Although the ASTB has been a good predictor of aviation student performance in training, it was proposed that incremental improvement could be gained with the introduction of novel, computer administered performance-based measures: Block Rotation (BRT) and a Navy-developed Compensatory Tracking task. This work constituted an initial validation of the BRT, an interactive virtual analog of Shepard-Metzler's (1971) Mental Rotation task that was developed with the intention of quantifying mental rotation and psychomotor ability. For Compensatory Tracking, this work sought to determine if data gathered concord with results in extant literature, confirming the validity of the task. Data from the BRT were examined to determine task reliability and to formulate relevant quantitative/predictive performance human models. Results showed that the BRT performance is a valid spatial ability predictor whose output can be modeled, and that Compensatory Tracking task data concord with the psychometric properties of tracking tasks that have been previously presented in the literature.
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Date Issued: 2008
Identifier: CFE0002413, ucf:47764
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0002413

Title: Design, Development, and Testing of a Miniature Fixture for Uniaxial Compression of Ceramics Coupled with In-Situ Raman Spectrometer.
Creator: Jordan, Ryan, Orlovskaya, Nina, Kwok, Kawai, Ghosh, Ranajay, University of Central Florida
Abstract / Description: This thesis is about the design, development and integration of an in-situ compression stage which interfaces through the Leica optical microscope coupled with a Renishaw InVia micro-Raman spectrometer. This combined compression stage and Raman system will enable structural characterization of ceramics and ceramic composites. The in-situ compression stage incorporates a 440C stainless steel structural components, 6061 aluminum frame, a NEMA 23 stepper motor. Two load screws that allow to...
Show moreThis thesis is about the design, development and integration of an in-situ compression stage which interfaces through the Leica optical microscope coupled with a Renishaw InVia micro-Raman spectrometer. This combined compression stage and Raman system will enable structural characterization of ceramics and ceramic composites. The in-situ compression stage incorporates a 440C stainless steel structural components, 6061 aluminum frame, a NEMA 23 stepper motor. Two load screws that allow to apply compressive loads up to 14,137 N, with negligible off axis loading, achieving target stresses of 500 MPa for samples of up to 6.00 mm in diameter. The system will be used in the future to study the structural changes in ceramics and ceramic composites, as well as to study thermal residual stress redistribution under applied compressive loads. A broad variety of Raman active ceramics, including the traditional structural ceramics 3mol%Y2O3-ZrO2, B4C, SiC, Si3N4, as well as exotic materials such as LaCoO3 and other perovskites will be studied using this system. Calibration of the systems load cell was performed in the configured state using MTS universal testing machines. To ensure residual stresses from mounting the load cell did not invalidate the original calibration, the in-situ compression stage was tested once attached to the Renishaw Raman spectrometer using LaCoO3 ceramic samples. The Raman shift of certain peaks in LaCoO3 was detected indicative of the effect of the applied compressive stress on the ceramics understudy.
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Date Issued: 2019
Identifier: CFE0007824, ucf:52809
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007824

Title: NON-DESTRUCTIVE MICROSTRUCTURAL EVALUATION OF YTTRIA STABILIZED ZIRCONIA, NICKEL ALUMINIDES AND THERMAL BARRIER COATINGS USING ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY.
Creator: Vishweswaraiah, Srinivas, Sohn, Yongho, University of Central Florida
Abstract / Description: There has been an urge for increasing the efficiency in advanced gas turbine engines. To fulfill these needs the inlet gas temperatures should be increased in the gas turbine engines, thermal barrier coatings (TBCs) have gained significant applications in increasing the gas inlet temperatures. Insulating characteristics of ceramic TBCs allow the operation at up to 150~250 ˚C higher gas temperatures. Because of the severe turbine engine operating conditions that include high...
Show moreThere has been an urge for increasing the efficiency in advanced gas turbine engines. To fulfill these needs the inlet gas temperatures should be increased in the gas turbine engines, thermal barrier coatings (TBCs) have gained significant applications in increasing the gas inlet temperatures. Insulating characteristics of ceramic TBCs allow the operation at up to 150~250 ˚C higher gas temperatures. Because of the severe turbine engine operating conditions that include high temperature, steep temperature gradient, thermal cycling, oxidation and hot-corrosion, TBCs can fail by spallation at the interface between the metal and ceramic. The lack of understanding in failure mechanisms and their prediction warrant a development of non-destructive evaluation technique that can monitor the quality and degradation of TBCs. In addition, the development of NDE technique must be based on a robust correlation to the characteristics of TBC failure.The objective of this study is to develop electrochemical impedance spectroscopy (EIS) as a Non-destructive evaluation (NDE) technology for application to TBCs. To have a better understanding of the multilayer TBCs using EIS they were divided into individual layers and EIS were performed on them. The individual layers included polycrystalline ZrO2-7~8 wt.%Y2O3 (YSZ) (topcoat) of two different densities were subjected to sintering by varying the sintering temperature and holding time for three different thickness and hot extruded NiAl alloy buttons which were subjected to isothermal oxidation with varying temperature and time. NiAl is as similar to the available commercial bondcoats used in TBCs. Then degradation monitoring with electrolyte penetration was carried out on electron beam physical vapor deposited (EB-PVD) TBCs as a function of isothermal exposure. Quality control for air plasma sprayed TBCs were carried out as a function of density, thickness and microstructure. Dense vertically cracked TBCs were tested as a function of vertical crack density and thickness.Electrochemical impedance response was acquired from all specimens at room temperature and analyzed with an AC equivalent circuit based on the impedance response as well as multi-layered structure and micro-constituents of specimens. Physical and microstructural features of these specimens were also examined by optical and electron microscopy. The EIS measurement was carried out in a three-electrode system using a standard Flat Cell (K0235) from Princeton Applied Research and IM6e BAS ZAHNER frequency response analyzer. The electrolyte employed in this investigation was 0.01M (molar) potassium Ferri/Ferro Cyanide {(K3Fe(CN)6/K4Fe(CN)6•3H2O)}.The thickness and density were directly related to the resistance and capacitance of the polycrystalline YSZ with varying thickness and open pores. As the effective thickness of the YSZ increased with sintering time and temperature, the resistance of the YSZ (RYSZ) increased proportionally. The variation in capacitance of YSZ (CYSZ) with respect to the change in porosity/density and thickness was clearly detected by EIS. The samples with high porosity (less dense) exhibited large capacitance, CYSZ, compared to those with less porosity (high density), given similar thickness. Cracking in the YSZ monoliths resulted in decrease of resistance and increase in capacitance and this was related to the electrolyte penetration.Growth and spallation of TGO scale on NiAl alloys during isothermal oxidation at various temperatures and holding time was also correlated with resistance and capacitance of the TGO scale. With an increase in the TGO thickness, the resistance of the TGO (RTGO) increased and capacitance of the TGO (CTGO) decreased. This trend in the resistance and capacitance of the TGO changed after prolonged heat treatment. This is because of the spallation of the TGO scale from the metal surface. The parabolic growth of TGO
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Date Issued: 2004
Identifier: CFE0000041, ucf:52855
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000041

Title: INCREMENTAL LIFECYCLE VALIDATION OF KNOWLEDGE-BASED SYSTEMS THROUGH COMMONKADS.
Creator: Batarseh, Feras, Gonzalez, Avelino, University of Central Florida
Abstract / Description: This dissertation introduces a novel validation method for knowledge-based systems (KBS).Validation is an essential phase in the development lifecycle of knowledge-based systems. Validation ensures that the system is valid, reliable and that it reflects the knowledge of the expert and meets the specifications. Although many validation methods have been introduced for knowledge-based systems, there is still a need for an incremental validation method based on a lifecycle model. Lifecycle...
Show moreThis dissertation introduces a novel validation method for knowledge-based systems (KBS).Validation is an essential phase in the development lifecycle of knowledge-based systems. Validation ensures that the system is valid, reliable and that it reflects the knowledge of the expert and meets the specifications. Although many validation methods have been introduced for knowledge-based systems, there is still a need for an incremental validation method based on a lifecycle model. Lifecycle models provide a general framework for the developer and a mapping technique from the system into the validation process. They support reusability, modularity and offer guidelines for knowledge engineers to achieve high quality systems. CommonKADS is a set of models that helps to represent and analyze knowledge-based systems. It offers a de facto standard for building knowledge-based systems. Additionally, CommonKADS is a knowledge representation-independent model. It has powerful models that can represent many domains. Defining an incremental validation method based on a conceptual lifecycle model (such as CommonKADS) has a number of advantages such as reducing time and effort, ease of implementation when having a template to follow, well-structured design, and better tracking of errors when they occur. Moreover, the validation method introduced in this dissertation is based on case testing and selecting an appropriate set of test cases to validate the system. The validation method defined makes use of results of prior test cases in an incremental validation procedure. This facilitates defining a minimal set of test cases that provides complete and effective system coverage. CommonKADS doesn't define validation, verification or testing in any of its models. This research seeks to establish a direct relation between validation and lifecycle models, and introduces a validation method for KBS embedded into CommonKADS.
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Date Issued: 2011
Identifier: CFE0003621, ucf:48879
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003621

Title: Characterization of Dynamic and Static Mechanical Behavior of Polyetherimide.
Creator: Mutter, Nathan, Gordon, Ali, Raghavan, Seetha, Xu, Chengying, University of Central Florida
Abstract / Description: Polymers are increasingly being used in engineering designs due to their favorable mechanical properties such as high specific strength, corrosive resistance, manufacturing flexibility. The understanding of the mechanical behavior of these polymers under both static and dynamic loading is critical for their optimal implementation in engineering applications. One such polymer utilized in a wide variety of applications from medical instrumentation to munitions is Polyetherimide, referred to as...
Show morePolymers are increasingly being used in engineering designs due to their favorable mechanical properties such as high specific strength, corrosive resistance, manufacturing flexibility. The understanding of the mechanical behavior of these polymers under both static and dynamic loading is critical for their optimal implementation in engineering applications. One such polymer utilized in a wide variety of applications from medical instrumentation to munitions is Polyetherimide, referred to as Ultem. This thesis characterizes both the static and dynamic mechanical behavior of Ultem 1000 through experimental methods and numerical simulations. Standard compression experiments were conducted on and MTS test frame to characterize the elastic-plastic behavior of Ultem 1000 under quasi-static conditions. The dynamic response of the material was investigated at very high strain rates using a custom built miniaturized Kolsky bar apparatus. The smaller Kolsky bar configuration was chosen over the conventional Kolsky device to increase the maximum capable strain rates and to reduce common experimental problems such as wave dispersion, friction, and stress equilibrium. Since a universal test standard for this apparatus is not available, the details of the design, construction, and experimental procedures of this device are provided. The results of the high strain rate testing revealed a bilinear relationship between the material yield stress and strain rate. This relationship was modeled using the Ree-Eyring two stage activation process equation.
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Date Issued: 2012
Identifier: CFE0004238, ucf:49533
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004238

Title: OPTIMIZED MARKET INTRODUCTION OF LARGE CAPITAL PRODUCTS WITH LONG DEVELOPMENT AND LEARNING CYCLES.
Creator: Lembcke, Antje, Malone, Linda, University of Central Florida
Abstract / Description: Any product sold is expected to be reliable and available when the customer wants to operate it. Companies that produce large capital products (LCP), such as rockets, satellites, or large gas turbines to generate electrical energy, tend to shy away from extending their testing and validation method above the requirements by law, mainly due to the very high costs of each additional test and the uncertain return on investment. This research shows that todayÃ‚Â's state of...
Show moreAny product sold is expected to be reliable and available when the customer wants to operate it. Companies that produce large capital products (LCP), such as rockets, satellites, or large gas turbines to generate electrical energy, tend to shy away from extending their testing and validation method above the requirements by law, mainly due to the very high costs of each additional test and the uncertain return on investment. This research shows that todayÃ‚Â's state of the art validation methods for LCP, required by law, or suggested in literature, and adapted by these industries, are not capable of capturing all significant failure modes (or even enough failure modes), with the consequence that the subsequently sold commercial products will still experience failures with significant effects on product reliability, and subsequently on the companiesÃ‚Â' bottom line earnings projections. The research determines the type of data (significant variables) necessary to correlate a companyÃ‚Â's validation policy to product failures after commercialization, and predicts the financial impact of the current validation policy on the companyÃ‚Â's profitability. A systems dynamics model to assess a company's testing policy is developed and an optimized product validation plan is suggested, and its impact on a companyÃ‚Â's profitability is demonstrated through simulation. A generic methodology is derived and its viability is illustrated using a specific product and a dynamic model developed with data available to the researcher. The generic method can be applied by any company to develop its own model for optimizing product reliability prior to market introduction.
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Date Issued: 2010
Identifier: CFE0003413, ucf:48404
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003413

Title: FUNDAMENTAL STUDY OF MECHANICAL AND CHEMICAL DEGRADATION MECHANISMS OF PEM FUEL CELL MEMBRANES.
Creator: Yoon, Wonseok, Huang, Xinyu, University of Central Florida
Abstract / Description: One of the important factors determining the lifetime of polymer electrolyte membrane fuel cells (PEMFCs) is membrane degradation and failure. The lack of effective mitigation methods is largely due to the currently very limited understanding of the underlying mechanisms for mechanical and chemical degradations of fuel cell membranes. In order to understand degradation of membranes in fuel cells, two different experimental approaches were developed; one is fuel cell testing under open circuit...
Show moreOne of the important factors determining the lifetime of polymer electrolyte membrane fuel cells (PEMFCs) is membrane degradation and failure. The lack of effective mitigation methods is largely due to the currently very limited understanding of the underlying mechanisms for mechanical and chemical degradations of fuel cell membranes. In order to understand degradation of membranes in fuel cells, two different experimental approaches were developed; one is fuel cell testing under open circuit voltage (OCV) with bi-layer configuration of the membrane electrode assemblies (MEAs) and the other is a modified gas phase FentonÃ‚Â's test. Accelerated degradation tests for polymer electrolyte membrane (PEM) fuel cells are frequently conducted under open circuit voltage (OCV) conditions at low relative humidity (RH) and high temperature. With the bi-layer MEA technique, it was found that membrane degradation is highly localized across thickness direction of the membrane and qualitatively correlated with location of platinum (Pt) band through mechanical testing, Infrared (IR) spectroscopy, fluoride emission, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectroscopy (EDS) measurement. One of the critical experimental observations is that mechanical behavior of membranes subjected to degradation via FentonÃ‚Â's reaction exhibit completely different behavior with that of membranes from the OCV testing. This result led us to believe that other critical factors such as mechanical stress may affect on membrane degradation and therefore, a modified gas phase FentonÃ‚Â's test setup was developed to test the hypothesis. Interestingly, the results showed that mechanical stress directly accelerates the degradation rate of ionomer membranes, implying that the rate constant for the degradation reaction is a function of mechanical stress in addition to commonly known factors such as temperature and humidity. Membrane degradation induced by mechanical stress necessitates the prediction of the stress distribution in the membrane under various conditions. One of research focuses was on the developing micromechanism-inspired continuum model for ionomer membranes. The model is the basis for stress analysis, and is based on a hyperelastic model with reptation-inspired viscous flow rule and multiplicative decomposition of viscoelastic and plastic deformation gradient. Finally, evaluation of the membrane degradation requires a fuel cell model since the degradation occurs under fuel cell operating conditions. The fuel cell model included structural mechanics models and multiphysics models which represents other phenomena such as gas and water transport, charge conservation, electrochemical reactions, and energy conservation. The combined model was developed to investigate the compression effect on fuel cell performance and membrane stress distribution.
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Date Issued: 2010
Identifier: CFE0003006, ucf:48359
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003006

Title: ACHIEVEMENT FOR ADVANCEMENT VIA INDIVIDUAL DETERMINATION (AVID) STUDENTS AND NON-AVID STUDENTS IN SELECT CENTRAL FLORIDA HIGH SCHOOLS IN 2007-2009: A COMPARATIVE STUDY.
Creator: Connors, Linda, Taylor, Rosemarye, University of Central Florida
Abstract / Description: The focus of this study was to examine the relationship of student participation in the Advancement Via Individual Determination (AVID) program and student academic performance. More specifically, this study was conducted to determine if there was a mean difference in student performance on the Florida Comprehensive Assessment Test (FCAT) in mathematics, reading, and writing between students who participated in the AVID program during their first two years of high school and students who had...
Show moreThe focus of this study was to examine the relationship of student participation in the Advancement Via Individual Determination (AVID) program and student academic performance. More specifically, this study was conducted to determine if there was a mean difference in student performance on the Florida Comprehensive Assessment Test (FCAT) in mathematics, reading, and writing between students who participated in the AVID program during their first two years of high school and students who had similar demographics (e.g., ethnicity, gender, and economic status) but did not participate in the AVID program for 2007-2009. The population for this study consisted of students from six high schools with certified AVID programs during the 2007-2008 and 2008-2009 school years in two central Florida school districts. Students participating in the AVID program were matched with non-AVID participants for each school site by ethnicity, gender, socioeconomic status, and tenth grade mathematics or English course. The results of this study did not indicate statistically significant differences in the FCAT mathematics and reading developmental scale score gains between the AVID and non-AVID students. However, the non-AVID students performed significantly higher on the tenth grade writing component of the FCAT. Participation in the AVID program produced no statistically significant findings for the factors of gender, ethnicity, and socioeconomic status for FCAT mathematics, reading, or writing. The findings indicated that AVID and non-AVID students could not be differentiated by FCAT performance measures in the mathematics and reading domains.
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Date Issued: 2010
Identifier: CFE0003206, ucf:48567
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003206

Title: Analysis of Dialog Surrounding Animal Testing in Vaccine Research.
Creator: Johnson, Natalie, Scott, Blake, Rounsaville, Angela, Wheeler, Stephanie, University of Central Florida
Abstract / Description: This study analyzed the scholarly discussions surrounding the topic of animal testing for vaccine potency and safety in humans. The primary stakeholders in this discussion are the scientists, medical professionals, and researchers who are involved in animal models and alternative testing methods, specifically related to vaccine development. The debate among these professionals regarding alternative methods, which encompasses any testing approach that does not involve animals, has been...
Show moreThis study analyzed the scholarly discussions surrounding the topic of animal testing for vaccine potency and safety in humans. The primary stakeholders in this discussion are the scientists, medical professionals, and researchers who are involved in animal models and alternative testing methods, specifically related to vaccine development. The debate among these professionals regarding alternative methods, which encompasses any testing approach that does not involve animals, has been analyzed. This project looks at the argument from a historical perspective, which provides background context for the current debate and an understanding of how the current arguments originated. The changing mindset over time of using animals has been explored, as well as conversations and arguments about alternative methods.Research questions and prior questions consider the conversation's historical influences on this present day debate and are answered in this analysis. Persuasive language has been looked at, with a consideration of how it is used both within and outside the research community, as well as the influences the various stakeholders have on one another. The burgeoning field of the rhetoric of health and medicine provides a forum and a community of scholars for a rhetorical analysis such as this one to be discussed and the findings considered for other rhetorical studies. This research design project provides a comprehensive rhetorical analysis that uses the topoi theory and a textual-intertextual analysis as a framework, along with detailed coding of the texts. This project shows the advantages of a combined rhetorical approach that leads to understanding a debate through identifying multiple layers of argument. The findings and its implications for those within rhetoric, the scholarly community, as well as the scientific field are discussed in the final chapter.
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Date Issued: 2017
Identifier: CFE0006609, ucf:51288
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006609

Title: Can Best Practices in Writing Instruction and Standardized Testing Coexist?.
Creator: Cannavino, Karen, Bell, Kathleen, Wardle, Elizabeth, Roozen, Kevin, University of Central Florida
Abstract / Description: At the high school level, teachers are tasked with a twofold agenda: they must prepare their students for college level and other post-secondary writing, and they must also make sure they perform well on the standardized writing tests that are required by the state. The stakes in standardized testing continue to rise, especially in Florida. Since the passing of the No Child Left Behind Act in 2002 (NCLB) and the implementation of the Race to the Top Assessment Program (RTTT) in 2009, teachers...
Show moreAt the high school level, teachers are tasked with a twofold agenda: they must prepare their students for college level and other post-secondary writing, and they must also make sure they perform well on the standardized writing tests that are required by the state. The stakes in standardized testing continue to rise, especially in Florida. Since the passing of the No Child Left Behind Act in 2002 (NCLB) and the implementation of the Race to the Top Assessment Program (RTTT) in 2009, teachers across the nation have experienced intense pressures related to standardized testing. Many schools' efforts to conform to testing requirements have had the unintended consequence of narrowing their focus to the content of the test. As teachers and administrators experience the pressure to meet the requirements, it has become impossible to implement any pedagogy without test results in mind. The challenge facing high school writing teachers is formidable: how can they best choose their new approach to pedagogy, given the pressures of standardized testing, the new curriculum requirements, and the need to ensure that they equip students with the skills they will need to write in college? This thesis explores the question by analyzing the key factors that impact writing instruction in Florida high school classrooms: testing requirements, curriculum requirements, and the content of writing textbooks being used. Do these factors encourage teachers to follow the best practices in writing instruction recommended by field-based research? What knowledge can we gain from comparing these factors, which may be helpful to today's writing instructors in light of the challenges they face? Through this research and analysis, I hope to provide insight that can inform high school writing teachers on the heart of the issue: is it possible for best practices in writing instruction and standardized testing to coexist in their classrooms?
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Date Issued: 2016
Identifier: CFE0006084, ucf:50956
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006084

Title: A Delphi Study to Construct a Script Concordance Test for Spiritual and Religious Competence in Counseling.
Creator: Christmas, Christopher, Young, Mark, Hagedorn, William, Bai, Haiyan, Carson, David, University of Central Florida
Abstract / Description: The need to address spiritual and religious issues is well established in the counseling literature and in accreditation standards, however, many graduates counseling students do not feel prepared to address these issues. In the United States, the vast majority of clients consider themselves to be spiritual or religious, so counselors who lack competence in addressing spiritual and religious issues in counseling are likely to offer ineffective or perhaps unethical care to clients. Counselor...
Show moreThe need to address spiritual and religious issues is well established in the counseling literature and in accreditation standards, however, many graduates counseling students do not feel prepared to address these issues. In the United States, the vast majority of clients consider themselves to be spiritual or religious, so counselors who lack competence in addressing spiritual and religious issues in counseling are likely to offer ineffective or perhaps unethical care to clients. Counselor educators must improve education and assessment in this critical specialty area of counseling. Of primary concern is a student's ability to demonstrate spiritual competence in counseling. The 2009 ASERVIC Spiritual Competencies offer the most comprehensive standard of spiritual competence in counseling in any mental health profession, however there is no reliable and standardized assessment that measures demonstrated spiritual competency. Competency can best be measured when the examinee makes choices in a context that is similar or the same as that in which he or she will practice, therefore an effective competency measurement must include client cases. The purpose of this study was to investigate whether a case based assessment for measuring clinical judgment in situations of uncertainty, called a Script Concordance Test, could be constructed by experts using the Delphi Method. This instrument was based on the 2009 ASERVIC Spiritual Competencies as the standard for demonstrated competence. The results of this study indicated that expert practitioners and educators could come to consensus on appropriate cases, appropriate competencies to measure in each case, items to assess competency in each case, and an instrument that included items assessing all 14 of the 2009 Spiritual Competencies. Additionally, the constructed instrument demonstrated excellent test retest reliability and adequate internal reliability.There are several implications for counselor education. First, this study provides evidence that expert practitioners and educators can come to consensus to construct a highly contextual instrument to measures clinical decision making about spiritual competence in counseling. Second, a promising new type of instrument with excellent reliability and strong content validity has been introduced to the field of counselor education. Third, with appropriate assessment, counselor education programs can begin to measure student competence, in terms of clinical judgment, on addressing spiritual and religions issues in counseling over time because this instrument is appropriate for use at different intervals throughout professional development. Fourth, the format of this instrument is also useful for educational purposes and reflective practice. Finally, the theoretical foundations of the Delphi Method and script concordance tests are compatible with one another and with instrument development. The researcher recommends that future studies to construct script concordance tests for other specialty areas of competence employ and refine this method.
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Date Issued: 2013
Identifier: CFE0005149, ucf:50695
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005149

Title: Performance Evaluation of Two Silt Fence Geosynthetic Fabrics During and After Rainfall Event.
Creator: Dubinsky, Gregg, Chopra, Manoj, Randall, Andrew, Wang, Dingbao, Gogo-Abite, Ikiensinma, University of Central Florida
Abstract / Description: Silt fence is one of the most widely used perimeter control devices and is considered an industry standard for use in the control of sediment transport from construction sites. Numerous research studies have been conducted on the use of silt fence as a perimeter control, including a number of studies involving controlled laboratory flume tests and outdoor tests performed in the field on construction sites with actual monitored storm events. In field tests, due to the random and uncontrollable...
Show moreSilt fence is one of the most widely used perimeter control devices and is considered an industry standard for use in the control of sediment transport from construction sites. Numerous research studies have been conducted on the use of silt fence as a perimeter control, including a number of studies involving controlled laboratory flume tests and outdoor tests performed in the field on construction sites with actual monitored storm events. In field tests, due to the random and uncontrollable nature of real storm events and field conditions, studies have shown difficulty in evaluating silt fence performance. These field studies have shown the need for performance testing of silt fence in a more controlled environment, which can also simulate the actual use and performance in the field. This research, which is a continuation of ongoing research on silt fence fabrics at UCF Stormwater and Management Academy, was conducted in order to evaluate silt fence performance under simulated field conditions. Presented in this thesis are evaluation of two silt fence fabrics, a woven (ASR 1400) fabric and nonwoven (BSRF) fabric. Both fabrics were installed separately on a tilted test bed filled with a silty-sand soil and subjected to simulated rainfall.Previous field studies on the performance of silt fence fabrics have evaluated the turbidity and sediment removal efficiencies only after the rain event, with the assumption that the efficiency values represent the true overall performance of silt fence. The results of this study revealed that the turbidity and suspended sediment performance efficiencies of silt fence were significantly affected by the time of sampling. The performance efficiencies during rainfall remained less than 55 percent, however, after the rainfall event ended, the performance efficiencies increased over time, reaching performance efficiency upwards of 90 percent. The increase in efficiency after rainfall was due to the constant or decreasing ponding depth behind the silt fence, increased filtration due to fabric clogging, and sedimentation of suspended particles.The nonwoven fabric was found to achieve higher removal efficiencies and flow-through rates both during and after the rain event when compared with the woven fabric. However, over the entire test duration (during and after rainfall combined), the projected overall efficiencies of both fabrics were similar. The projected overall average turbidity performance efficiencies of the woven and nonwoven silt fence fabrics was 80 and 78 percent, respectively. Both fabric types also achieved comparable overall average suspended sediment concentration efficiencies of 79 percent. This result leads to the conclusion that silt fence performance in the field is dependent on three main processes: filtration efficiency occurring during the rain event, filtration and sedimentation efficiency occurring after the rainfall event, and flow-through rate of the silt fence fabrics. Decreases in the flow-through rate lead to increases in the overall efficiency. This thesis quantifies the different mechanisms by which these processes contribute to the overall efficiency of the silt fence system and shows how these processes are affected by different conditions such as the degree of embankment slope and rainfall intensity.
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Date Issued: 2014
Identifier: CFE0005158, ucf:50688
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005158

Title: An Evaluation Study of the Implementation of Webcam Proctoring for Secure Testing in a K-12 Virtual School.
Creator: Geiser Hogan, Elena, Gunter, Glenda, Hartshorne, Richard, Boote, David, Kennedy, Kathryn, Gordon, William, University of Central Florida
Abstract / Description: ABSTRACT The purpose of this evaluative study was to review the implementation of a Webcam Test-Proctoring Program (WTPP) implemented in a Kindergarten through 12th grade public virtual school. Results of the evaluative study will be used to determine if the secure Webcam proctoring method would be a viable solution to a problem of practice(-)requiring full-time virtual school students to participate in the multitude of required state and Florida school district assessments. At the core of...
Show moreABSTRACT The purpose of this evaluative study was to review the implementation of a Webcam Test-Proctoring Program (WTPP) implemented in a Kindergarten through 12th grade public virtual school. Results of the evaluative study will be used to determine if the secure Webcam proctoring method would be a viable solution to a problem of practice(-)requiring full-time virtual school students to participate in the multitude of required state and Florida school district assessments. At the core of virtual education lies the appeal of flexibility in each student's individual learning path. The rigid nature of secure assessments conflict with the intentions of a K-12 virtual school. Natale and Cook (2012) identified this as a problem of practice as well, stating, (")Digital learning de-standardizes and decentralizes educational delivery, so it presents challenges in applying quality control systems and metrics that were developed for more traditional school structures(") (p. 541).A formal evaluation included an electronic survey and one-on-one phone interviews. The sample population for this study included 6th-12th grade students (n = 27) who were enrolled in Hurricane County Virtual School during the 2014-2015 school year. The HCVS population was 165 at the beginning of the 2014-2015 school year, therefore the population for this study was N=165. The WTPP evaluated for this study took place over two test sessions, the first in October of 2014 and the second in January 2015. Students were asked to complete the electronic survey and to volunteer to complete phone interviews to provide feedback about their experience completing their benchmark assessments. In this mixed-methods study, an electronic survey created by the evaluator and research chair gathered quantitative data that were analyzed using descriptive and inferential statistics. In order to determine if there was any relationship between specific demographic sub-groups and their experiences and preferences regarding Webcam proctoring, the researcher used the Kruskal-Walis and Mann-Whitney inferential statistics. Additionally, qualitative data were collected through one-on-one phone interviews with six students who participated in the WTPP. Data from these interviews yielded supporting statements for the quantitative data analyzed. Results yielded from this study indicated that the majority of students who participated in the WTPP were satisfied or very satisfied with this method of proctoring for secure testing overall. Future studies should further evaluate the effectiveness of Webcam proctoring for secure testing and determine the impact of allowing students more flexibility (which Webcam proctoring inherently does) while testing has on their test scores.
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Date Issued: 2016
Identifier: CFE0006457, ucf:51441
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006457

FCAT (7)	+ -
Florida Comprehensive Assessment Test (5)	+ -
standardized tests (5)	+ -
testing (5)	+ -
Nuclear disarmament (4)	+ -

Nuclear weapons (4)	+ -
Testing (4)	+ -
standardized testing (4)	+ -
student achievement (4)	+ -
NCLB (3)	+ -
Reliability (3)	+ -
accountability (3)	+ -
professional development (3)	+ -
Assessment (2)	+ -
Finite Element Analysis (2)	+ -
High School (2)	+ -
James Rest (2)	+ -
Lawrence Kohlberg (2)	+ -
Mathematics (2)	+ -
Mechanical Testing (2)	+ -
Micro Mechanical Testing (2)	+ -
Middle School (2)	+ -
Mobility (2)	+ -
No Child Left Behind (2)	+ -
Retention (2)	+ -
Sediment control (2)	+ -
Selective Laser Melting (2)	+ -
Simulated rainfall (2)	+ -
Sinkhole (2)	+ -
Socioeconomic Status (2)	+ -

ETD Collection (103)	+ -
Honors Collection (11)	+ -
PRISM: Political & Rights Issues & Social Movements (5)	+ -

University of Central Florida (110)	+ -
Taylor, Rosemarye (12)	+ -
Bai, Haiyan (5)	+ -
Murray, Barbara (5)	+ -
Baldwin, Lee (3)	+ -

Boote, David (3)	+ -
Chopra, Manoj (3)	+ -
DeMara, Ronald (3)	+ -
Engineering (3)	+ -
Hahs-Vaughn, Debbie (3)	+ -
Hoffman, Jay (3)	+ -
Murray, Kenneth (3)	+ -
Nam, Boo Hyun (3)	+ -
Orlovskaya, Nina (3)	+ -
Raghavan, Seetha (3)	+ -
Sivo, Stephen (3)	+ -
Stout, Jeffrey (3)	+ -
Wang, Dingbao (3)	+ -
Blair, Richard (2)	+ -
Cintron Delgado, Rosa (2)	+ -
Clausen, Christian (2)	+ -
Dhere, Neelkanth (2)	+ -
Doherty, Walter (2)	+ -
Duranceau, Steven (2)	+ -
Flammia, Madelyn (2)	+ -
Fouty, Ed (2)	+ -
Fragala, Maren (2)	+ -
Fukuda, David (2)	+ -
Gay, David (2)	+ -
Gogo-Abite, Ikiensinma (2)	+ -

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