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      • The Intersection of Race/Ethnicity, Gender and Exceptionality: The Racialized Construction of Educational Disabilities and Giftedness

        Fish, Rachel Elizabeth ProQuest Dissertations & Theses The University of 2015 해외박사(DDOD)

        RANK : 247343

        소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        In this dissertation, I explore the relations between student race/ethnicity, nativity, gender, and exceptionality, and I examine how school context shapes those relations. I argue that exceptionalities are socially constructed, and that differe. In the first empirical chapter, I use a factorial vignette survey to test for race/ethnicity, nativity, and gender effects in how teachers respond to children indicating academic and behavioral differences in the classroom. I found that boys of. In the second empirical chapter, I use a dataset of Wisconsin public school students to test whether and how school racial/ethnic composition moderates the relationship between individual-race/ethnicity and placement in special education across. In the final empirical chapter, I use school-level racial composition data and an experimental survey design to examine whether a student's race/ethnicity, nativity, and gender affect teacher decisions to refer for exceptionality testing differe.

      • Metriplectic systems

        Fish, Daniel Portland State University 2005 해외박사(DDOD)

        RANK : 247343

        소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        A metriplectic structure on a smooth manifold M is a pair of covariant tensors P and g which are skew-symmetric and symmetric respectively. A metriplectic system is a dynamical system defined by the equations x˙ = PdH + gdS for smooth functions H and S on M. In this exploratory work, we investigate the geometric aspects of metriplectic dynamical systems and the geometry of smooth manifolds equipped with metrplectic structures. In the case that g is Riemannian, the general form of a metriplectic connection in terms of the Levi-Civita connection is found. A theorem by Shubin regarding the existence of a Kahler structure on M is reformulated in terms of metriplectic structures. We also show that if the Levi-Civita connection for the metric g is metriplectic, then every Hamiltonian vector field defined by P is divergence-free with respect to g. Criteria for the integrability of orthogonal distributions are obtained in terms of the tensor P. It is shown that these conditions are equivalent to the closure of the kernel of P under the bracket of one-forms induced by the metric g. As an application of these results, integrability is proved on the dual to a semi-simple Lie algebra, as well as on the dual to the Lie algebra of Euclidean motions. A Hamiltonian system on a Kahler manifold is shown to be harmonic if and only if the Hamiltonian function H is pluriharmonic . This result is extended to partially-Kahler manifolds in which the skew-symmetric form is degenerate. Metriplectic representations of several well-known physical systems are found, including the dampened oscillator, the van der Pol system, the Lorenz system and the controlled Duffing oscillator. A metriplectic model of stored memory is developed. A method is found for constructing natural geometric perturbations of 3d Hamiltonian systems by introducing a symmetric covariant tensor which is defined in terms of the Hamiltonian function. We demonstrate this perturbation method on the equations for the rigid body and for a controlled harmonic oscillator.

      • Thermal Isolation of High Power Devices in Heterogeneous Integration

        Fish, Michael Christopher University of Maryland, College Park ProQuest Diss 2017 해외박사(DDOD)

        RANK : 247343

        소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Heterogeneous integration (HI) technologies present an important development in the pursuit of higher performance and reduced size, weight, power and cost of electronic systems (SWAP-C). HI systems, however, pose additional challenges for thermal management due to the disparate operating conditions of the devices. If the thermal coupling between devices can be reduced through a strategy of thermal isolation, then the SWAP-C of the accompanying thermal solution can also be reduced. This is in contrast to the alternative scenario of cooling the entire package to the maximum reliable temperature of the most sensitive devices. This isolation strategy must be implemented without a significant increase in device interconnect distances. A counter-intuitive approach is to seek packaging materials of low thermal conductivity---e.g. glass---and enhance them with arrays of metallic through-layer vias. This dissertation describes the first ever demonstration of integrating such via-enhanced interposers with microfluidic cooling, a thermal solution key to the high power applications for which HI was developed. Among the interposers tested, the best performing were shown to exhibit lower thermal coupling than bulk silicon in selective regions, validating their ability to provide thermal isolation. In the course of the study, the via-enhanced interposer is modeled as a thermal metamaterial with desirable, highly-anisotropic properties. Missing from the supporting literature is an accurate treatment of these interposers under such novel environments as microfluidic cooling. This dissertation identifies a new phenomenon, thermal microspreading, which governs how heat couples into a conductive via array from its surroundings. Both finite element analysis (FEA) and a new analytic solution of the associated boundary value problem (BVP) are used to develop a model for describing microspreading. This improves the ability to correctly predict the thermal behavior of via-enhanced interposers under diverse conditions.

      • Landowner perceptions of ecosystem health in upper Great Lakes states riparian landscapes

        Fish, Thomas Edward University of Minnesota 2001 해외박사(DDOD)

        RANK : 247343

        소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Riparian landscapes in the Upper Great Lake states play a prominent role in defining the biophysical and sociocultural character of the region. People value riparian areas for their natural aesthetic appeal, as places for reflection and solitude, as destinations for recreation and tourism, and as source areas for extractive resource use. As transition zones between aquatic and terrestrial systems, riparian areas perform important ecological and physical functions including pollutant interception and capture, storage and delivery of organic material to aquatic systems, microclimate regulation, and provision of habitat for resident and transient species. As more people choose to live and recreate in riparian areas, the potential increases for human activities to degrade riparian health and diminish performance. Natural resource management agencies are challenged with finding acceptable solutions to meet the changing demands of the public and adequately managing the resources under their care. To inform riparian management in the Upper Great Lakes states, qualitative and quantitative survey methods were used to identify benefits people associate with riparian landscapes, assess public perceptions of human impacts on riparian ecosystems, and gauge public support for management strategies to sustain the health of riparian landscapes. Survey data were compared across pre-existing land ownership characteristics and across unique groups identified through cluster analysis of landowner responses. Landowners' perceptions differed significantly with respect to the perceived benefits associated with riparian landscapes. This suggests that management messages aimed at groups exhibiting common benefit perceptions will be more effective than messages aimed at groups with common ownership characteristics.

      • Reforming the American Public Sphere: The Media Reform Models of Progressive Television Journalists in the Era of Internet Convergence and Neoliberalism

        Fish, Adam Richard University of California, Los Angeles 2012 해외박사(DDOD)

        RANK : 247343

        소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Based on ethnographic data, this dissertation analyzes the broadcasting and media reformative models of workers in American television and internet video news networks. Media reform broadcasters seek to diversify the American public sphere as a counterhegemonic movement through recursively using technology and policy to create access for increased diversity of voice. Their challenges illustrate the problems for democracy in a neoliberal state.

      • Biochemical and genetic investigations of transcript initiation and elongation in Saccharomyces cerevisiae

        Fish, Rachel Naomi University of California, Berkeley 2002 해외박사(DDOD)

        RANK : 247343

        소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Transcription can be regulated at any one of its four distinct steps: promoter binding and activation, RNA chain initiation, elongation, and termination. In recent years, attention has turned to investigations of the processes of initiation and elongation as targets for regulation in the cell. Transcript initiation is composed of two phases, abortive initiation and promoter escape. Studies with prokaryotes have provided a great deal of information about this phase. However, the mechanistic details of initiation by RNA polymerase II in eukaryotes are lacking. An <italic>in vitro</italic> system that allows quantitative measurement of abortive initiation and promoter escape would be useful in providing details about this stage of transcription in eukaryotes. I used protein factors from the yeast <italic>Saccharomyces cerevisiae</italic> to evaluate multiple parameters that might establish such a system. Many details about transcript elongation are unknown, and elongation regulation was the focus of my work. The eukaryotic transcript elongation factor TFIIS promotes transcript cleavage and readthrough by RNA polymerase II at blocks to elongation <italic>in vitro</italic>. Despite high sequence conservation among organisms, yeast and human TFIIS are unable to interact with each other's RNA polymerases. A region corresponding to a flexible linker tethering two independently folding structural domains was identified as one region of TFIIS contributing to species specificity. In an effort to identify additional determinants of species specificity, I chose to convert a human TFIIS protein into a protein functional in yeast by mutagenesis. However, this gain of function approach was less successful than expected on theoretical grounds. New elongation regulators were identified by previous work in the laboratory wherein synthetic lethality was observed between null alleles of <italic> TFG3</italic> and <italic>PPR2</italic>, the gene encoding TFIIS. This genetic interaction requires the amino-terminal domain of TFIIS. This region is not required either for the known <italic>in vitro</italic> activities of TFIIS or for known <italic>in vivo</italic> effects of disrupting <italic>PPR2</italic>. I investigated the requirements for involvement of this domain <italic>in vivo</italic>. I also found that the presence of a Myc epitope N-terminal to the domain interferes with the genetic interaction between <italic>PPR2 </italic> and <italic>TFG3</italic>. This work emphasizes the role of the amino-terminal domain in the interaction.

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