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      • Indirect effects of recreational fishing on spiny lobster (Panulirus argus) behavior, mortality and population dynamics

        Parsons, Darren Michael North Carolina State University 2006 해외박사(DDOD)

        RANK : 2591

        In this study, we quantified indirect effects within the Caribbean spiny lobsters (Panulirus argus) fishery in the Florida Keys, USA, including mechanisms that resulted in behavioral modification and lobster mortality, and potential population and economic consequences of these indirect effects. The spiny lobster fishery in the Florida Keys has intense recreational sport-diver effort during a 2d mini-season in which 80-90% of legal lobsters are removed from some areas, and an over capitalized commercial trap fishery where >900,000 lobster traps are deployed annually. In field surveys we observed a 27% increase in the density of injured lobsters on patch reef habitats from before to after the 2 d mini-season, but not in other habitat types. In laboratory Y-maze shelter choice experiments, we observed that un-injured lobsters were less likely to shelter with injured lobsters than with un-injured lobsters. Using disturbance experiments conducted in the field we observed that disturbing and injuring lobsters on a coral patch-head caused individuals to emigrate from that patch-head before the mini-season, but had no effect on lobster density on patch heads after the mini-season. When lobsters were tethered in the field, mortality was higher when injured than uninjured. Similarly, lobsters that were exposed to triggerfish predators (Balistes capriscus) in a large seawater arena had a higher probability of mortality after being disturbed and injured. We used an individual-based population model to quantify potential population and economic impacts of injuries lobsters receive from sport-divers in the Florida Keys. Model results suggest that the severity of population and economic impacts are dependent on the frequency of lobster injuries throughout the Florida Keys fishery. For example, areas associated with high densities of injured lobsters may have a ≥50% reduction in the abundance of adult lobsters and associated recreational and commercial harvests. In areas where the density of injured lobsters was ∼20 times lower, the impact of injuries on the adult lobster population and commercial landings was only 5 and 8%, respectively. Despite the seemingly smaller impact in areas with lower densities of injured lobsters, injuries may still be responsible for a 900 t reduction in the adult stock biomass and a 160 t, or $1.6 million reduction in annual commercial landings when scaled to the entire spiny lobster fishery in the Florida Keys. (Abstract shortened by UMI.).

      • Development and Application of Improvements to the Tile-based Fisher Ratio Method and Fundamental Instrument Considerations for Non-targeted Analysis using Two-dimensional Gas Chromatography

        Parsons, Brendon Andrew University of Washington ProQuest Dissertations & 2016 해외박사(DDOD)

        RANK : 2591

        Comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry GCxGC--TOFMS has arguably made possible the largest increase in gas chromatograph performance since the innovation of the wall-coated open tubular (WCOT) capillary analytical column in 1979. As with the adoption of capillary columns, taking advantage of the performance possible with GCxGC--TOFMS has required the carefully study of fundamental chromatographic parameters and the development of new data analysis strategies and software to leverage the data rich output of the platform for meaningful discovery in complex chemical matrices. This dissertation presents a thorough account the development and validation of the tile-based Fisher ratio software, which aims to provide a robust and efficient method for non-targeted analysis in experiments comprised of classes of GCxGC--TOFMS chromatograms. Additionally, the software is further developed and demonstrated in a unique application to a challenging problem of forensic interest: the chemical characterization of the illicit acid alteration of diesel fuel. Finally, the chromatographic methods used in the development, validation, and demonstration of the software are carefully examined in the context of instrument performance, and compared to alternative instrumental configurations that have the potential to further increase performance.

      • Literary maps: Cartography in Anglo-Irish literature

        Parsons, Coilin Columbia University 2008 해외박사(DDOD)

        RANK : 2591

        My dissertation proposes maps as key to navigating the landscape of Anglo-Irish literature. The Anglo-Irish Revival of the late nineteenth and early twentieth century depended on the maps produced by the Ordnance Survey of the British army between 1824 and 1841 for much of its raw material. This material came from the extensive investigations in history, archaeology, and folklore carried out by the employees of the survey, as well as from the maps themselves. I argue that the survey's historical and cartographic contributions are central to the work of Irish writers from the apocryphal translator James Clarence Mangan to J.M. Synge, and W.B. Yeats. "Literary Maps" reinserts these authors' works into their contemporary cultural and disciplinary context---the development of a significant and effective tool of British government in Ireland---and argues for the centrality of mapping to their understanding of history. I also make an intervention into the study of colonial mapmaking, reading the maps and associated publications of cartographers from the seventeenth to the nineteenth centuries. I argue that the history of cartography in Ireland undermines our understanding of maps of colonized spaces as a seamless language of power; while maps promise to encode and consolidate power, they also facilitate the unbinding of that power. Though the process of map-making offers new imaginative possibilities for Irish literature in English, the traffic is by no means one way, and my dissertation hinges on the symbiotic relationship between describing Ireland in maps and describing it in imaginative literature. Mangan, Synge, and Yeats all offer compelling alternative visions of landscape, history, and folklore that constantly interrupt the appearance of order so carefully constructed in maps, exposing and exploiting the fissures that I identify in my reading of the work of the Ordnance Survey. In addition, these writers look to maps to provide an imaginative idea of landscape that overcomes the narrow, sectarian divisions of the nationalist movement, and proposes an inclusive, cosmopolitan vision of the state. "Literary Maps" attempts to recuperate the shared history of mapmaking and literature in Ireland.

      • Nuclear magnetic resonance methods for the analysis of water diffusion in neural tissue

        Parsons, Edward Cronin, Jr Yale University 2002 해외박사(DDOD)

        RANK : 2591

        This thesis reviews the development of methods for analyzing microscopic water motion in mammalian neural tissues using Magnetic Resonance Imaging (MRI). The clinically relevant mechanism for the change in Apparent Diffusion Coefficient (ADC) in brain and nerve is explored with Nuclear Magnetic Resonance (NMR) measurements and analyzed in terms of geometric tissue parameters. The standard Pulsed Gradient Spin Echo (PGSE) technique for MR diffusion measurement is applied to investigate the mechanism of ADC change observed during electrical activity in neural tissue, and to explore the displacement spectrum of water in such tissue in normal and ischemic states. Oscillating gradient methods are applied with the goal of extending downward the technically feasible time scale of such diffusion-displacement spectrum measurements. The oscillating gradient scheme is generalized to facilitate, for the first time, true temporal diffusion spectroscopy. Temporal diffusion spectra are measured in well-characterized samples of water in packed microspheres, and the extraction of geometric parameters from spectral data is calibrated. The methodology is then applied to brain and nerve tissue. The extension of these methods to the discernment of various diffusion and pseudo-diffusive flow phenomena is discussed.

      • "And a hundred other shadowy things": Specters of the transnational in nineteenth-century American literature

        Parsons, Amy Catherine University of California, Irvine 2007 해외박사(DDOD)

        RANK : 2591

        This dissertation takes its title from Herman Melville's Moby-Dick, and Ishmael's shapeless but powerful foreboding before his departure on the Pequod. In it I explore the complex relationship between antebellum prose fiction, particularly the genres of the sea adventure and the domestic novel of reform, and elements of an emerging transnational capitalism that supported the United States' economic and territorial expansion in the decades prior to the Civil War. I argue that the sea adventure and the domestic novel---imaginative elaborations of the ideal national subject at home and abroad---demonstrate how the discourses of commerce, science, racial purity, and domesticity were mutually constitutive and necessary to the stability of the bourgeois subject at the heart of both national identity and literary production. These genres were especially important to that stable subject as the constant presence of the transnational threatened to undermine its coherence. In The Narrative of Arthur Gordon Pym, Edgar Allan Poe reinforces the idealized authority of his narrator through the plagiarism of several scientific texts; however, both the narrator and narrative structure fragment and collapse the farther Pym travels from recognizably national territories. Jamaican writer Mary Seacole's autobiography produces scathing judgments of the democratic failures of both the United States and England from an international perspective; however, her reliance on the language of capitalism and science as means to reform the destruction of domestic spaces for women of African descent reproduces the very hierarchies she tries to resist. In Uncle Tom's Cabin, Harriet Beecher Stowe uses the power of sentimental fiction to purge the nation and home of the evils of slavery, but her unnamed anxiety about racial impurity infuses her commitment to repatriation, which transforms African-Americans from potential fellow citizens at home to a distant market for American goods abroad. Herman Melville's Moby-Dick accommodates the transnational in ways that require both narrative innovations and new cultural strategies for imagining national subjects.

      • Probing the Hubbard Model with Single-Site Resolution

        Parsons, Maxwell Fredrick Harvard University ProQuest Dissertations & Theses 2016 해외박사(DDOD)

        RANK : 2591

        Strongly-correlated electron systems generate some of the richest phenomena and most challenging theoretical problems studied in physics. One approach to understanding these systems is with ultracold fermionic atoms in optical lattices, which can provide a level of control and ways of observing strongly-correlated fermionic systems that are not accessible with conventional materials. This thesis describes the development of an experimental technique where a quantum gas of fermionic 6Li atoms is prepared in a two-dimensional optical lattice and each atom can be frozen in place and imaged with single-site resolution. Combining a vacuum-compatible large numerical aperture microscope with Raman sideband cooling enables site-resolved fluorescence imaging with high fidelity. We observe several phases of the Hubbard model, including band and Mott insulators. The observed in-situ occupation distributions of atoms in the lattice are compared to theory with unprecedented detail and are used to determine the thermodynamic properties of the system. By combining site-resolved imaging with a spin-removal technique, we observe antiferromagnetic correlations in the Hubbard model with single-site resolution. We observe, for the first time in cold atom systems, beyond-nearest-neighbor magnetic correlations, which provide a direct measurement of the correlation length. We also present detailed measurements of the formation of correlations during lattice loading.

      • Multiple dimensions of peer victimization and their relations with children's psychological, social, behavioral, and academic functioning

        Parsons, Sarah K University of Maryland, College Park 2012 해외박사(DDOD)

        RANK : 2591

        This study investigated the relations among victimization and psychological, social, behavioral, and academic functioning while considering how these constructs are conceptualized and measured. Victimization was treated as a multidimensional variable that can be distinguished in terms of form (relational vs. overt), informant (self vs. teacher vs. peer report), and its overlap with aggression. Participants were 99 ethnically diverse second and third graders from the mid-Atlantic region. The observed relations between victimization and functioning were impacted by issues of informant, form, and aggression. When examining different measures of the same construct, correlations were more often statistically significant for same-informant pairs of measures compared to cross-informant pairs. Correlations between peer and teacher reports were stronger than correlations between self- and other-reports. Self-other agreement was higher for aggression than for victimization, suggesting that victimization is more individualistically experienced than aggression. Peer and teacher reports of victimization were not significantly related to self-reported functioning and vice versa. Teacher and peer reports did not add to self-reports of victimization in predicting self-reported functioning. Peer and teacher reports of victimization uniquely predicted peer and teacher reports of functioning, but self-reported victimization did not make an additive contribution. These results provide evidence of a self-other dichotomy in the assessment of victimization. Overt and relational victimization emerged as distinct constructs in exploratory factor analyses. However, they were significantly correlated, and self-reports of relational victimization did not uniquely predict functioning after accounting for overt victimization. There were not significant gender differences in the two types of victimization. Aggression and victimization were significantly correlated. Peer-reported victimization was related to teacher-reported externalizing and school problems, but was not a significant predictor after accounting for aggression. This finding suggests that failing to account for the overlap between aggression and victimization might obscure the complexity of the relationship between victimization and functioning. The implications of these findings for future research are discussed.

      • Improving preceptor self-efficacy using an on-line educational program

        Parsons, Rachelle University of Minnesota 2006 해외박사(DDOD)

        RANK : 2591

        Purpose. Currently, preceptors are widely utilized in nursing education. While preceptor education programs are encouraged, gaps in the literature remain in the content and methodology needed to effectively prepare preceptors for their role in the clinical education of baccalaureate nursing students. Methods. A descriptive correlational research design was used to explore the effect of a public/community health web-based preceptor education program on knowledge of the preceptor role and self-efficacy to perform in the preceptor role. A convenience sample of 48 public/community health nurses from five states completed an on-line education program designed to enhance preceptor knowledge and skill. Instruments for this study included a 32 question quiz and a preceptor self-efficacy instrument. Analyses described demographic information; ANOVAs were performed to determine the relationship between completing the on-line education program to both self-efficacy and knowledge scores; and correlations were completed to determine the relationship between demographic variables and self-efficacy scores of public/community health nurses. Results. Self-efficacy and knowledge scores improved significantly after completing the on-line education program when compared with pretest scores. Previous experience as a preceptor, age, and place of employment, were not correlated with self-efficacy scores for public/community health nurses in this study. Both previous preceptor education and highest level of education completed were positively correlated with self-efficacy scores. Formal preceptor education was reported by 60% of nurses in this study; for those nurses previously completing preceptor education there was no standard curriculum for these programs; and the average amount of time elapsed since the last preceptor education program had been completed was 7.25 years. Conclusions. Both the method of on-line education and the content including learning styles, evaluation of students, teaching strategies, conflict management, communication strategies, cultural competency, roles and responsibilities & student objectives appear to be effective in improving preceptor self-efficacy and role knowledge. With the continued reliance on preceptors in clinical settings, it is imperative to provide nurses with knowledge and skills related to the precepting role to improve satisfaction of nurses with the precepting role and to provide quality learning experiences for students.

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