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DOE OSTI2020

Materials Data on NaSe by Materials Project

NaSe crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to six equivalent Se1- atoms to form edge-sharing NaSe6 octahedra. All Na–Se bond lengths are 3.09 Å. In the second Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six equivalent Se1- atoms. All Na–Se bond lengths are 3.00 Å. Se1- is bonded in a 7-coordinate geometry to six Na1+ and one Se1- atom. The Se–Se bond length is 2.48 Å.

36 MATERIALS SCIENCE↗

NASA NTRS2015

Wideband Digital Signal Processing Test-Bed for Radiometric RFI Mitigation

Radio Frequency Interference (RFI) is a persistent and growing problem experienced by spaceborne microwave radiometers. Recent missions such as SMOS, SMAP, and GPM have detected RFI in L, C, X, and K bands. To proactively deal with this issue, microwave radiometers must (1) Utilize new algorithms for RFI detection (2) Utilize fast digital back-ends that sample at hundreds of MHz. The wideband digital signal processing testbed (WB-RFI) is a platform that allows rapid development and testing various RFI detection and mitigation algorithms.

Bradley, Damon C.↗