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Corrosion And Metallurgical Behavior Of Alloy C-22 For High-Temperature Applications, Raghunandan A Karamcheti
Corrosion And Metallurgical Behavior Of Alloy C-22 For High-Temperature Applications, Raghunandan A Karamcheti
UNLV Retrospective Theses & Dissertations
Austenitic Alloy C-22 has been tested for evaluation of its tensile and corrosion properties under conditions relevant to the nuclear hydrogen generation process known as the sulfur-iodine cycle. The results of tensile testing indicate that this alloy may be capable of maintaining metallurgical stability and enhanced ductility at temperatures up to 600°C. The stress-corrosion-cracking data suggest that this alloy may not undergo cracking in an acidic solution at 90°C at constant-load, the true failure stress (of) was significantly reduced under a slow-strain-rate condition using both smooth and notched specimens. The magnitude of the critical potentials determined by a polarization technique …
Examining The Influence And Developmental Impact Of After-School/Out-Of-School Programs On Youths From High Risk Environments, Ranna Jane Daud
Examining The Influence And Developmental Impact Of After-School/Out-Of-School Programs On Youths From High Risk Environments, Ranna Jane Daud
UNLV Retrospective Theses & Dissertations
Currently, thousands of youth-based programs exist to promote education, enhance development and instill a sense of belonging and competence in inner-city/urban youth. After-school programs have been found to develop resilience in adolescents (Morrison, Storino, Robertson, Weissgass, & Dondero, 2000) by providing opportunities for growth, increasing academic achievement (Mahoney, Lord, & Carryl, 2005), providing a safe environment (Kahne, Nagoaka, Brown, O'Brien, Quinn, & Thiede, 2001), creating supportive and significant relationships (Hall, Yohalem, Tolman, & Wilson, 2003), and keeping youth out of harms way. Furthermore, after-school programs have been found to increase academic potential, increase attendance rates in school, and promote academic …
High-Temperature Deformation And Environment-Induced Degradation Of Waspaloy, Jagadesh K Yelavarthi
High-Temperature Deformation And Environment-Induced Degradation Of Waspaloy, Jagadesh K Yelavarthi
UNLV Retrospective Theses & Dissertations
The tensile properties of Waspaloy, a candidate structural material to be used in nuclear hydrogen generation, were evaluated at temperatures up to 1000°C. The results indicate that this alloy was capable of maintaining appreciably high tensile strength up to 600°C, followed by a substantial drop beyond this temperature. Between ambient temperature and 300°C, the failure strain was lowest at 300°C due to a maximum dislocation density, as determined by transmission electron microscopy. The lowest ductility was, however, observed at 800°C, possibly due to the formation of brittle sigma phase. The cracking susceptibility of Waspaloy in an acidic solution was enhanced …
An Arima-Model-Based Approach With Hazard Area For The Probability Of Volcanic Disruption Of The Proposed High-Level Radioactive Waste Repositiory At Yucca Mountain, Nevada, Usa, Xiaojuan Liu
UNLV Retrospective Theses & Dissertations
An interesting extension of advanced time-series analysis techniques is introduced into the domain of volcanological data exploration. A new and innovative use of the well-known ARIMA method for modeling the recurrence rate of volcanism ranging from simple Poissonian volcanoes to those showing cyclic trends is presented. Specifically, we propose a new tool to fingerprint the eruptive behavior of a volcano, which also links some modeling tools of two of the most developed areas in the literature of statistics: stochastic processes and time series. Valuable modeling and computing insights are discussed using a data set from the volcanic database at Yucca …
Application Of Computational Fluid Dynamics For High Energy Efficiency Design With Human Comfort Of Cad-Vav And Ufad Systems, Bhanu Rekha Bandhakavi
Application Of Computational Fluid Dynamics For High Energy Efficiency Design With Human Comfort Of Cad-Vav And Ufad Systems, Bhanu Rekha Bandhakavi
UNLV Retrospective Theses & Dissertations
This thesis deals with the numerical simulation of the ceiling air distribution (CAD) system and the Under Floor Air Distribution (UFAD) system based on the dimensions of BTLab at UNLV. Ceiling Air Distribution (CAD) with variable air volume (VAV) and Under Floor Air Distribution (UFAD) systems have been widely used in different countries. CAD-VAV and UFAD systems designs have been influenced by increasing emphasis on indoor air quality (IAQ), energy conservation, environmental effects, safety, and economics. So, 3-D Computational Fluid Dynamics (CFD) analysis technique was applied to design high energy efficiency and human comfort CAD-VAV and UFAD systems. The goal …
Exploring The Effects Of Online Instructional Models On The Writing Achievement Of High School Students With And Without Disabilities, Bradley Jon Kaffar
Exploring The Effects Of Online Instructional Models On The Writing Achievement Of High School Students With And Without Disabilities, Bradley Jon Kaffar
UNLV Retrospective Theses & Dissertations
The purpose of the study was to investigate the effectiveness of three online models for teaching a paragraph writing strategy to students with and without disabilities. A learning strategist instructor implemented The Paragraph Writing Strategy (Schumaker & Lyerla, 1993) using three treatment groups that included the following online models: (a) Power Point media, (b) streaming video, and (c) multimedia (Power Point and video). Participants were 121 high school students in grades 9 through 12 enrolled in an online charter school program; there were 27 students with disabilities and 94 students without disabilities. Data were collected to answer five research questions …
Effects Of Test -Taking Strategy Instruction On High -Functioning Adolescents With Autism Spectrum Disorder, Dal Hee Songlee
Effects Of Test -Taking Strategy Instruction On High -Functioning Adolescents With Autism Spectrum Disorder, Dal Hee Songlee
UNLV Retrospective Theses & Dissertations
Students with autism spectrum disorder (ASD) are expected to take various forms of tests in general education classrooms, therefore test-taking skills are very important and a necessary tool for students with ASD as they strive for academic success. The Test-Taking Strategy (Hughes, Schumaker, Deshler, & Mercer, 2002) has been found to be useful for students with learning disabilities and emotional behavioral disorders (EBD), but not yet with students with ASD; The purpose of this multiple-probe design study was to investigate the effects of test-taking strategy instruction on high-functioning adolescents with ASD. Specifically, the Test-Taking Strategy (Hughes et al.) was taught …