1,578 research outputs found

    Visualization of High-Dimensional Combinatorial Catalysis Data

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    The role of various techniques for visualization of high-dimensional data is demonstrated in the context of combinatorial high-throughput experimentation (HTE). Applying visualization tools, we identify which constituents of catalysts are associated with final products in a huge combinatorially generated data set of heterogeneous catalysts, and catalytic activity regions are identified with respect to pentanary composition spreads of catalysts. A radial visualization scheme directly visualizes pentanary composition spreads in two-dimensional (2D) space and catalytic activity of a final product by combining high-throughput results from five slate libraries. A glyph plot provides many possibilities for visualizing high-dimensional data with interactive tools. For catalyst discovery and lead optimization, this work demonstrates how large multidimensional catalysis data sets are visualized in terms of quantitative composition activity relationships (QCAR) to effectively identify the relevant key role of compositions (i.e., lead compositions) of catalysts

    “To Follow the Bright Star”: American Involvement in the Spanish Civil War and the Shaping of the U.S. Popular Front, 1937-1938

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    This thesis explores how American volunteers in the Spanish Civil War worked to create a unified Popular Front, a coalition of left-leaning political groups, in the United States in the late 1930s. Between 1937 and 1938, approximately 2800 Americans volunteered in the Spanish Republican Army to defend the Spanish Republic in the civil war that followed General Francisco Franco’s Nationalist coup. At the start of the war, Germany, Portugal, and Italy declared support for the insurgents and turned an isolated civil war into an international conflict centered around fascism. While the United States established a policy of non-intervention, the Soviet Union and International Communist Party officially supported the Spanish Republicans. Because of this, American involvement in the Spanish Civil War was largely coordinated by the International Communist Party and the Soviet Union. This, coupled with the Cold War between the Soviet Union and the United States following World War II, has created the tendency to equate American volunteers in Spain with an arm of the Soviet Union. Examining their correspondence during the Spanish Civil War, however, reveals a diversity of political motivations for volunteering in Spain. This thesis argues that volunteers minimized political differences within the Popular Front in order to appeal to moderates back in the United States and persuade the U.S. government to end its position of neutrality. United States volunteers intentionally unified the American Left during the Spanish Civil War in response to the threat of fascism, a threat that volunteers believed included domestic concerns regarding race, ethnicity, and class oppression

    Finding Hope: Guatemalan War Orphans\u27 Responses to the Long-Term Consequences of Genocide

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    The most brutal period of genocide in Guatemala, known as la violencia and denoting the period of 1978-1983, left tens of thousands of mostly Maya indigenous children orphaned. In this dissertation, I present results from research I conducted with war orphans who are now adults and who were raised at a permanent residential home for orphaned children in Santa Apolonia, a majority Maya Kaqchikel Highlands town. Comparing 20 of these war orphans with 20 of their peers from the town of Santa Apolonia, I found that orphans had suffered greater long-term consequences from the genocide. Relative to their peers, orphans reported more genocide-related childhood trauma and ongoing effects of that trauma, greater economic challenges in adulthood because of economic loss sustained from the death of parents and property destruction brought about by la violencia, and more severed familial and community ties, which dramatically shifted their centers of socialization and enculturation during their most formative years of childhood. Nonetheless, orphans in my research project reported higher levels of emotional resiliency and post-traumatic growth and higher rates of college and advanced education enrollment than their peers, allowing them to outpace their peers economically and professionally. In addition, despite having lost familial and natal community ties, orphans asserted a deeply-rooted sense of identity and belonging in the Guatemalan nation-state today, based on a more fluid conceptualization of identity that allows for a simultaneous internalized sense of continuity and active participation in creative practices. Experiencing neither identity loss\u27 nor an \u27identity crisis,\u27 orphans are actively and creatively adapting to their situations and contexts as orphaned survivors of genocide and maintaining a sense of profound rootedness that cannot be destroyed by external forces. Based on these findings with a particular group of war orphans, I illustrate that even in the long-term aftermath of the most brutal, inhumane violence, genocide survivors, by engaging in creative and constructive practices, can overcome adversity and build a life of hope.\u2

    Magnetotransport properties of a polarization-doped three-dimensional electron slab

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    We present evidence of strong Shubnikov-de-Haas magnetoresistance oscillations in a polarization-doped degenerate three-dimensional electron slab in an Alx_{x}Ga1x_{1-x}N semiconductor system. The degenerate free carriers are generated by a novel technique by grading a polar alloy semiconductor with spatially changing polarization. Analysis of the magnetotransport data enables us to extract an effective mass of m=0.19m0m^{\star}=0.19 m_{0} and a quantum scattering time of τq=0.3ps\tau_{q}= 0.3 ps. Analysis of scattering processes helps us extract an alloy scattering parameter for the Alx_{x}Ga1x_{1-x}N material system to be V0=1.8eVV_{0}=1.8eV

    Virtual Probe Microscope : atomic force microscope simulator

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    Training multiple users on basic atomic force microscope (AFM) operation is expensive in both time and money. Using traditional classroom and lab instruction to train AFM users does not allow for sufficient hands-on training with the actual equipment. As in other fields and industries such as aviation and surgery, hands-on training can not be fully completed on the actual equipment. Training simulators have been developed for scenarios where the actual environment is either too expensive or too dangerous. Virtual Probe Microscope (VPM) has been developed as a training simulator for training multiple users on basic AFM operation. VPM is a Windows-based simulator that can simultaneously train a room full of users without the need of an actual AFM. Instructors can use this tool to demonstrate the exact same instruction that a user would receive in an AFM lab within the confines of a classroom, computer lab or living room for distance education students. To simulate the AFM physics, VPM uses a gaming physics engine to create a physical model of the AFM. The physics engine allows the complex behavior of the AFM to be modeled robustly and efficiently in the simulator. The interface of the simulator is a graphical user interface (GUI) that replicates the interface of one of the most popular commercial AFM models

    Sealed with a Kiss on Your Artery : An Archive of Southern Lesbian Desire

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    This dissertation examines southern lesbian feminist print culture of the 1970s-2000s, which produced some of the most intersectional work to come out of second-wave feminism— especially in terms of creative and critical challenges to anti-Blackness, classism, metrocentrism, and regional exceptionalism. A central contribution of “Sealed with a Kiss on Your Artery” is its reimagination of archival reading practices from a queer-feminist literary studies perspective. Each chapter examines the archive of a particular lesbian feminist figure and demonstrates a corresponding interpretive practice; I seek to encounter these historical figures in a manner befitting not only the facts of their contributions to lesbian feminism, but also their radical methods of mobilizing print culture to transform collective feeling, affiliation, and action. Taking North Carolina-based Feminary Collective’s lesbian feminist literary journal as a starting point, the first chapter demonstrates backward-onward reflexivity as a methodology, which researchers can use to confront the past so that our presently-situated research serves ever-evolving visions of justice. Drawing from the archive of writer and special collections librarian Ann Allen Shockley, the second chapter combines some of her theories of librarianship with close readings of her fiction to argue for reading practices that remain cognizant of the power dynamics of archival research. The third chapter revisits the lesbian feminist Sex Wars of the 1980s through the archive of southern writer and sex activist Dorothy Allison; I illustrate a process of perverting the archives to tell a story that moves away from the language of war and centers erotic labor as a form of care work. Finally, the fourth chapter proposes a queer praxis of care, kinship, and grief-work modeled after the speculative archive of Jewelle Gomez’s neo-slave vampire narrative The Gilda Stories

    Telecommunications access in rural Iowa : a study of local calling areas in the Southern Iowa Development District

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    http://www.worldcat.org/oclc/1808362
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