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      • Field, Experimental and Numerical Investigations into the Mechanisms and Drivers of Lateral Erosion in Bedrock Channels

        Fuller, Theodore Kent University of Minnesota 2014 해외박사(DDOD)

        RANK : 247343

        The process of lateral erosion in bedrock channels is poorly understood. This thesis sheds light on the mechanisms of lateral bedrock erosion as well as the larger scale drivers of lateral erosion. Contained in this thesis are three distinct studies: a field-based study that investigates the drivers of lateral planation of strath surfaces; an experimental study that seeks to identify specific mechanisms of lateral erosion; and a numerical modeling study that seeks to corroborate the findings of the experimental study and permit exploration of parameter space. The field study (Chapter 1) concludes that lateral planation of strath surfaces in the dominant channel erosion process during periods of elevated sediment supply. This study further concludes that the elevated sediment supply conditions were driven by changes in climate. The experimental study (Chapter 2) concludes that the deflection of saltating bedload particles by fixed roughness elements into the wall is an effective mechanism of erosion. In addition, the experimental study identifies a minimum roughness threshold that must be crossed before significant lateral erosion can occur. Finally, the experimental study suggests that once the roughness threshold is crossed (i.e. moving from a smooth bed devoid of roughness elements to a bed with roughness elements), further increases in bed roughness do not produce ever increasing rates of lateral erosion. Rather, an erosion rate plateau is reached shortly after the roughness threshold is crossed. The numerical modeling study (Chapter 3) corroborates the findings of the experimental study and demonstrates, from first principles, that lateral erosion by deflected bed load particles is an effective mechanism of lateral bedrock erosion. In addition, this study identifies an important trade-off between increased deflection surface area from larger roughness elements and the increased form drag associated with the larger roughness elements. Here, the increase in the number of particle deflections is offset by the decrease in particle kinetic energy on impact, resulting in the erosion rate plateau observed in the physical experiments.

      • Martyrdom and sacred violence: Dying for God in Matthew and Ignatius

        Bashaw, Jennifer Garcia Fuller Theological Seminary, Center for Advanced T 2012 해외박사(DDOD)

        RANK : 247343

        Abstract Scholars of early Christian martyrdom and its development have traced the roots of martyrdom through possible Jewish, Roman, and Greek literary influences. The only consensus that has emerged is that the idea of dying for someone else, of dying a noble or voluntary death, can be found throughout antiquity. How this idea made its metamorphosis into the second- through fourth-century Christian fervor for martyrdom remains a historical mystery. The NT is the main literary link we have between the early concepts of noble death and martyrdom in Jewish and Greek antiquity and the idea of martyrdom found in martyr acts of the early church. Thus, studying the concept of dying for God in NT literature and comparing the various theologies therein with those from later first- and second-century works should prove fruitful for uncovering clues regarding how the concept developed and what influences shaped it. This dissertation initiates a comparison between the martyr rhetoric found in Matthew's Gospel and in the letters of Ignatius of Antioch, one of the church's earliest martyrs. Because these two authors and their works differ with regard to genre and purpose, this dissertation compares them using the flexible and interdisciplinary method of socio-rhetorical criticism and by adopting a religious studies theory as the framework of comparison. I employ Rene Girard's theory of violence and religion as a lens through which to view Matthew and Ignatius in order to isolate and illuminate the discrepancies between their martyrologies. It is my thesis that certain elements of Ignatius' martyr rhetoric, when viewed in comparison to Matthew, reveal that Ignatius' participates in the cycle of sacred violence, the very myth that Matthew's Gospel works to counter. Matthew releases humanity from the perpetual cycle of sacred violence, encouraging martyrs to be faithful witnesses but not seek death. Ignatius, however, envisions his own martyrdom as a sacrifice and himself as a scapegoat, and re-enters the cycle of sacred violence.

      • The effects of previous victimization on women's psychological and health-related outcomes following sexual harassment

        Fuller, Tamara Lynn University of Illinois at Urbana-Champaign 2000 해외박사(DDOD)

        RANK : 247343

        Recent models of the effects of sexual harassment have suggested the importance of previous victimization as a factor that may mediate women's outcomes, and several studies from the sexual assault literature have demonstrated the importance of previous victimization on women's responses to sexual trauma. To examine the effects of previous victimization on women's psychological and health-related outcomes following sexual harassment, a sample of one hundred sexually harassed women were interviewed about their sexual harassment experiences, previous victimization experiences, and current psychological and health functioning. Results indicated that previous adult sexual assault was strongly related to poorer outcomes following harassment, even after controlling for the effects of sexual harassment frequency. Women with a history of adult sexual assault were approximately four times more likely to receive a diagnosis of post-traumatic stress disorder than women without sexual assault experiences during adulthood. These women were also more likely to experience increased symptoms of phobic anxiety, decreased self-esteem, decreased feelings of intimacy with others, and increased health-related problems. Previous childhood physical abuse was related to increased symptoms of phobic anxiety and decreased feelings of intimacy with others. In addition, the effects of multiple types of previous victimization were examined. Multiple victimization experiences seemed to have a cumulative effect on several outcomes, including PTSD diagnosis, self-esteem, beliefs about self-safety, other-trust, and other-intimacy, and health problems. The results are discussed in terms of their relationship to previous research and their implications for clinical work with sexually harassed women.

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