AFIT School of Engineering Contributions to Air Force Research and Technology. Calendar Year 1971

This report contains abstracts of Master of Science theses and Doctoral Dissertations completed during the 1971 calendar year at the School of Engineering, Air Force Institute of Technology

Index to NASA Tech Briefs, 1972

Abstracts of 1972 NASA Tech Briefs are presented. Four indexes are included: subject, personal author, originating center, and Tech Brief number

The 30/20 GHz flight experiment system, phase 2. Volume 2: Experiment system description

A detailed technical description of the 30/20 GHz flight experiment system is presented. The overall communication system is described with performance analyses, communication operations, and experiment plans. Hardware descriptions of the payload are given with the tradeoff studies that led to the final design. The spacecraft bus which carries the payload is discussed and its interface with the launch vehicle system is described. Finally, the hardwares and the operations of the terrestrial segment are presented

Surviving Ionizing Radiation: General Stress Response and Mechanisms for the Prevention and Repair of DNA Damage in <em>Halobacterium</em> sp. str. NRC-1

The effects of ionizing radiation on the extremely halophilic Archaeon Halobacterium sp. str. NRC-1 can be divided into three central themes: protection from oxidative damages, response to ionizing radiation, and repair of DNA double strand breaks (DSBs). Intracellular salts used to maintain osmotic balance in the hypersaline conditions Halobacterium cells require are shown in this study to provide in vivo protection from oxidative damages through the scavenging of hydroxyl radicals produced from the radiolysis of water by gamma radiation. These results highlight both the importance of the intracellular environment in determining radiation resistance and the multiplicity of pathways resulting in radiation resistance that can be utilized by various microbes resulting from their adaptations to common environmental stresses such as desiccation. The global stress response to gamma radiation was measured using both genomic and proteomic methods. The resulting systems view reveals cooperation amongst several cellular processes including DNA repair, increased protein turnover, apparent shifts in metabolism to favor nucleotide biosynthesis and an overall effort to repair oxidative damage. Further, we demonstrate the importance of time dimension while correlating mRNA and protein levels and suggest that steady state comparisons may be misleading while assessing dynamics of genetic information processing across transcription and translation. The repair of DNA DSBs incurred after exposure to gamma radiation was examined in greater detail. The in vivo role of the Mre11/Rad50 complex was determined in an archaeal model system to determine if these proteins performed the same role in homologous recombination repair as their eukaryotic homologs. Deletion of mre11 was found to reduce the rate of DSB repair, but not the overall survival of the cells. Taken together, the data presented here provide a halophilic model for radiation resistance that shares some common elements with other radiation resistant organisms such as Deinococcus radiodurans while presenting alternative mechanisms specific to extreme halophiles

NASA Tech Briefs Index, 1978

Approximately 601 announcements of new technology derived from the research and development activities of the National Aeronautics and Space Administration are presented. Emphasis is placed on information considered likely to be transferrable across industrial, regional, or disciplinary lines. Subject matter covered includes: electronic components and circuits; electron systems; physical sciences; materials; life sciences; mechanics; machinery; fabrication technology; and mathematics and information sciences

Final report on a study of automated rendezvous and docking for ATS 5 despin, volume 1

Investigation of cost effective utilization of space maintenance and repair techniques to despin Applications Technology Satellite number 5 - Vol.

Wide-Field InfraRed Survey Telescope (WFIRST) Final Report

In December 2010, NASA created a Science Definition Team (SDT) for WFIRST, the Wide Field Infra-Red Survey Telescope, recommended by the Astro 2010 Decadal Survey as the highest priority for a large space mission. The SDT was chartered to work with the WFIRST Project Office at GSFC and the Program Office at JPL to produce a Design Reference Mission (DRM) for WFIRST. Part of the original charge was to produce an interim design reference mission by mid-2011. That document was delivered to NASA and widely circulated within the astronomical community. In late 2011 the Astrophysics Division augmented its original charge, asking for two design reference missions. The first of these, DRM1, was to be a finalized version of the interim DRM, reducing overall mission costs where possible. The second of these, DRM2, was to identify and eliminate capabilities that overlapped with those of NASA's James Webb Space Telescope (henceforth JWST), ESA's Euclid mission, and the NSF's ground-based Large Synoptic Survey Telescope (henceforth LSST), and again to reduce overall mission cost, while staying faithful to NWNH. This report presents both DRM1 and DRM2.Comment: 102 pages, 57 figures, 17 table