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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ho(FeB)2 by Materials Project

Ho(FeB)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ho is bonded in a 8-coordinate geometry to eight equivalent Fe and eight equivalent B atoms. All Ho–Fe bond lengths are 2.94 Å. All Ho–B bond lengths are 2.94 Å. Fe is bonded in a 4-coordinate geometry to four equivalent Ho and four equivalent B atoms. All Fe–B bond lengths are 2.00 Å. B is bonded in a 4-coordinate geometry to four equivalent Ho and four equivalent Fe atoms.

36 MATERIALS SCIENCE↗
NASA NTRS2011

Wallops Low Elevation Link Analysis for the Constellation Launch/Ascent Links

To execute the President's Vision for Space Exploration, the Constellation Program (CxP) was formed to build the next generation spacecraft Orion and launch vehicles Ares, to transport human and cargo to International Space Station (ISS), moon, and Mars. This paper focuses on the detailed link analysis for Orion/Ares s launch and ascent links with Wallops 11.3m antenna (1) Orion's Dissimilar Voice link: 10.24 Kbps, 2-way (2) Ares Developmental Flight Instrument link, 20 Mbps, downlink. Three launch trajectories are considered: TD7-E, F (Feb), and G (Aug). In certain launch scenarios, the critical events of main engine cutoff (MECO) and Separation occur during the low elevation regime of WFF s downrange -- less than 5 degree elevation angle. The goal of the study is to access if there is enough link margins for WFF to track the DV and DFI links.

Constellation↗