This research examines the history of a small Florida agricultural community over the course of the twentieth century from a rhetorical perspective in order to understand the technological and communicative transitions that governed the development of American agricultural production. By examining archival and oral histories, this research will add to our understandings of how written and oral communications temper the relationships and social situations of an agricultural community, including the knowledge-making and technological adaptation resulting from communications within the community and with outside institutions and entities. Agricultural villages are not isolated entities, but rather sites of multiple rhetorical situations, and farmers do not farm alone, but inside an ecosystem of networked knowledges, practices, and traditions. Thus, the history of a singular farming community may serve as a rhetorical microcosm of modern American agriculture's evolution over the course of the twentieth century, and provide some mindfulness concerning the social, technological, and natural ecologies that act and interact within modern farming communities. This dissertation will use rhetorical genre theory and ideas of local literacies to examine the written and oral discourses that run through these ecologies for the purpose of tracing the relationships between the sponsors of agricultural ideas and technologies and the local farmers who interpreted, employed, and modified them. In addition, this project purports to add to digital history-making research through the construction of an historical archival website to which community members can add their voices. The Samsula Historical Archive creates an online nexus where community members can document, organize, and preserve the history of the community, offering a portal supporting multiple narratives and perspectives. Each family has its own stories and perspectives on historical happenings; by bringing these together in one databased location, the layers and interconnections will become clearer and perhaps stimulate further memories and insights. A discussion of the rhetorical choices faced in constructing such an artifact may also help future researchers embarking on such a project.

This dissertation concerns the development of the MicroWave Radiometer (MWR) brightness temperature (Tb) algorithm and the associated algorithm validation using on-orbit MWR Tb measurements. This research is sponsored by the NASA Earth Sciences Aquarius Mission, a joint international science mission, between NASA and the Argentine Space Agency (Comision Nacional de Actividades Espaciales, CONAE). The MWR is a CONAE developed passive microwave instrument operating at 23.8 GHz (K-band) H-pol and 36.5 GHz (Ka-band) H- and V-pol designed to complement the Aquarius L-band radiometer/scatterometer, which is the prime sensor for measuring sea surface salinity (SSS). MWR measures the Earth's brightness temperature and retrieves simultaneous, spatially collocated, environmental measurements (surface wind speed, rain rate, water vapor, and sea ice concentration) to assist in the measurement of SSS. This dissertation research addressed several areas including development of: 1) a signal processing procedure for determining and correcting radiometer system non-linearity; 2) an empirical method to retrieve switch matrix loss coefficients during thermal-vacuum (T/V) radiometric calibration test; and 3) an antenna pattern correction (APC) algorithm using Inter-satellite radiometric cross-calibration of MWR with the WindSat satellite radiometer. The validation of the MWR counts-to-Tb algorithm was performed using two years of on-orbit data, which included special deep space calibration measurements and routine clear sky ocean/land measurements.