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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

LIFTING AS WE CLIMB: EXPERIENCES OF BLACK DIVERSITY OFFICERS AT THREE PREDOMINANTLY WHITE INSTITUTIONS IN KENTUCKY

Johnson, Erica NićCole 01 January 2010 (has links)
Recently, colleges and universities across the country have created executive level positions responsible for institutional diversity. The origins of this work within higher education lay in the civil rights movements and its consequences for desegregation of higher education. Early diversity officer positions usually resided within student affairs. However, as the responsibilities of these offices have changed, the reporting lines have also changed such that diversity officers are now commonly situated within academic affairs. This exploratory study examines these administrative positions responsible for diversity at southern white institutions. The research takes an in-depth look at how these positions have shifted over time and how people who hold these positions understand their work. This study presents an analysis of nine personal narratives of diversity officers at three predominantly white institutions in Kentucky from the early 1970s to the present. Counterstories, or stories that challenge majority accounts, are used to elicit the experiences of the black diversity officers. The analysis uses critical race theory to begin telling stories that have been muted. Pigeonholing and its relevance to the counterstories of the administrators are discussed to contextualize the administrators’ experiences at predominantly white institutions. The shift in responsibilities and reporting lines and changes in required credentials resulted in tensions, including intraracial tensions, among the diversity officers. Despite the tensions between generations of officers, these administrators shared a common interest in racial uplift. This was evident as they discussed what attracted them to positions responsible for diversity. In the past, scholars writing on black diversity officers suggested that the positions were the result of tokenism; however, administrators holding these positions view themselves and their roles as an opportunity to help others on their educational journeys.
2

Enhancing the Photovoltaic Efficiency of a Bulk Heterojunction Organic Solar Cell

Sahare, Swapnil Ashok 01 April 2016 (has links)
Active layer morphology of polymer-based solar cells plays an important role in improving power conversion efficiency (PCE). In this thesis, the focus is to improve the device efficiency of polymer-based solar cells. In the first objective, active layer morphology of polymer-solar cells was optimized though a novel solvent annealing technique. The second objective was to explore the possibility of replacing the highly sensitive aluminum cathode layer with a low-cost and stable alternative, copper metal. Large scale manufacturing of these solar cells is also explored using roll-to-roll printing techniques. Poly (3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl (PCBM) were used as the active layer blend for fabricating the solar cell devices using bulk heterojunction (BHJ), which is a blend of a donor polymer and an acceptor material. Blends of the donor polymer, P3HT and acceptor, PCBM were cast using spin coating and the resulting active layers were solvent annealed with dichlorobenzene in an inert atmosphere. Solvent annealed devices showed improved morphology with nano-phase segregation revealed by atomic force microscopy (AFM) analysis. The roughness of the active layer was found to be 6.5 nm. The nano-phase segregation was attributed to PCBM clusters and P3HT domains being arranged under the solvent annealing conditions. These test devices showed PCE up to 9.2 % with current density of 32.32 mA/cm2, which is the highest PCE reported to date for a P3HT-PCBM based system. Copper was deposited instead of the traditional aluminum for device fabrication. We were able to achieve similar PCEs with copper-based devices. Conductivity measurements were done on thermally deposited copper films using the two-probe method. Further, for these two configurations, PCE and other photovoltaic parameters were compared. Finally, we studied new techniques of large scale fabrication such as ultrasonic spray coating, screen-printing, and intense pulse light sintering, using the facilities at the Conn Center for Renewable Energy Research at the University of Louisville. In this study, prototype devices were fabricated on flexible ITO coated plastics. Sintering greatly improved the conductivity of the copper nano-ink cathode layer. We will explore this technique’s application to large-scale fabrication of solar cell devices in the future work.

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