Engineering topics
Berman, D.
Publications and source records attributed to Berman, D..
Mapping Vesta: First Results from Dawn's Survey Orbit
The geologic objectives of the Dawn Mission [1] are to derive Vesta s shape, map the surface geology, understand the geological context and contribute to the determination of the asteroids origin and evolution. Geomorphology and distribution of surface features will provide evidence for impact cratering, tectonic activity, volcanism, and regolith processes. Spectral measurements of the surface will provide evidence of the compositional characteristics of geological units. Age information, as derived from crater size-frequency distributions, provides the stratigraphic context for the structural and compositional mapping results, thus revealing the geologic history of Vesta. We present here the first results of the Dawn mission from data collected during the approach to Vesta, and its first discrete orbit phase - the Survey Orbit, which lasts 21 days after the spacecraft had established a circular polar orbit at a radius of approx.3000 km with a beta angle of 10deg-15deg.
Magnetic Field Satellite (Magsat) data processing system specifications
The software specifications for the MAGSAT data processing system (MDPS) are presented. The MDPS is divided functionally into preprocessing of primary input data, data management, chronicle processing, and postprocessing. Data organization and validity, and checks of spacecraft and instrumentation are dicussed. Output products of the MDPS, including various plots and data tapes, are described. Formats for important tapes are presented. Dicussions and mathematical formulations for coordinate transformations and field model coefficients are included.
Ion engine thrust vector study Quarterly report
Ion beam current and direction changes due to electrode misalignment, and analysis of electrode temperature distribution and thermal stresses in ion engine thrust vector
Nonideal behavior of rotating gravitational mass sensors.
Vibrational mode behavior of rotating gravitational mass sensors and sensor design to minimize nonideal effect of manufacturing and external disturbances
Porosity effects in the ionization of cesium on tungsten.
Cesium vapor ionization on porous tungsten substrate creates gradients in surface atom concentrations diminishing ionization efficiency
Design of a solar-electric propulsion system for interplanetary spacecraft.
Feasibility design study of solar powered ion propulsion system for interplanetary spacecraft
Porosity effects on the oxidation of tungsten.
Rate of formation of tungsten oxide in porous sample, noting increase in rate of oxidation due to porosity effect
Nonideal behavior of rotating gravitational mass sensors
Nonideal behavior of rotating gravitational mass sensors