Cartography of irregularly shaped satellites

Irregularly shaped satellites, such as Phobos and Amalthea, do not lend themselves to mapping by conventional methods because mathematical projections of their surfaces fail to convey an accurate visual impression of the landforms, and because large and irregular scale changes make their features difficult to measure on maps. A digital mapping technique has therefore been developed by which maps are compiled from digital topographic and spacecraft image files. The digital file is geometrically transformed as desired for human viewing, either on video screens or on hard copy. Digital files of this kind consist of digital images superimposed on another digital file representing the three-dimensional form of a body

Digital cartography of Io

A high resolution controlled mosaic of the hemisphere of Io centered on longitude 310 degrees is produced. Digital cartographic techniques were employed. Approximately 80 Voyager 1 clear and blue filter frames were utilized. This mosaic was merged with low-resolution color images. This dataset is compared to the geologic map of this region. Passage of the Voyager spacecraft through the Io plasma torus during acquisition of the highest resolution images exposed the vidicon detectors to ionized radiation, resulting in dark-current buildup on the vidicon. Because the vidicon is scanned from top to bottom, more charge accumulated toward the bottom of the frames, and the additive error increases from top to bottom as a ramp function. This ramp function was removed by using a model. Photometric normalizations were applied using the Minnaert function. An attempt to use Hapke's photometric function revealed that this function does not adequately describe Io's limb darkening at emission angles greater than 80 degrees. In contrast, the Minnaert function accurately describes the limb darkening up to emission angles of about 89 degrees. The improved set of discrete camera angles derived from this effort will be used in conjunction with the space telemetry pointing history file (the IPPS file), corrected on 4 or 12 second intervals to derive a revised time history for the pointing of the Infrared Interferometric Spectrometer (IRIS). For IRIS observations acquired between camera shutterings, the IPPS file can be corrected by linear interpolation, provided that the spacecraft motions were continuous. Image areas corresponding to the fields of view of IRIS spectra acquired between camera shutterings will be extracted from the mosaic to place the IRIS observations and hotspot models into geologic context

Engaged research and practice: Higher education and the pursuit of the public good

Grounded in Boyer’s (1990) call for higher education to address “consequential problems” of society (p. 21), Engaged Research and Practice: Higher Education and the Pursuit of the Public Good highlights research and practice within the National Forum on Higher Education for the Public Good (the National Forum) to demonstrate how engaged scholarship can have a direct impact on local, state, and national communities. By giving examples of engaged scholarship at these varying levels of community, Engaged Research and Practice provides snapshots of engagement at different scales, thus advancing a concept of engaged research that moves beyond working with a local neighborhood or a non-profit organization. These chapters provide examples of organizational change at the institutional level and state and national initiatives all informed by or part of engaged research for the public good

Narratives of women\u27s sexual identity development: A collaborative inquiry with implications for rewriting transformative learning theory.

Transformative learning theory has attended primarily to cognition and our capacity to understand experience in terms of increasingly inclusive, discriminating, permeable, and integrative perspectives (Mezirow, 1991). However, it does not allow for an understanding of the intersubjective nature of meaning-making, nor does it address the workings of oppression or how learning occurs in relation to oppression. Thus, the purpose of this paper is to rewrite transformative learning to allow us to theorize the integration of the individual with the socio-historical and to enable the understanding of the relationship between individuals and social change