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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on DyAsS by Materials Project

DyAsS is Matlockite structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Dy3+ is bonded in a 5-coordinate geometry to four equivalent As1- and five equivalent S2- atoms. There are a spread of Dy–As bond distances ranging from 3.10–3.17 Å. There are a spread of Dy–S bond distances ranging from 2.80–2.85 Å. As1- is bonded in a 8-coordinate geometry to four equivalent Dy3+ and four equivalent As1- atoms. There are a spread of As–As bond distances ranging from 2.55–2.90 Å. S2- is bonded to five equivalent Dy3+ atoms to form a mixture of distorted corner and edge-sharing SDy5 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on DyAsSe by Materials Project

DyAsSe crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Dy3+ is bonded in a 9-coordinate geometry to four equivalent As1- and five equivalent Se2- atoms. There are a spread of Dy–As bond distances ranging from 3.08–3.17 Å. There are a spread of Dy–Se bond distances ranging from 2.90–3.04 Å. As1- is bonded in a 8-coordinate geometry to four equivalent Dy3+ and four equivalent As1- atoms. There are two shorter (2.59 Å) and two longer (2.99 Å) As–As bond lengths. Se2- is bonded in a 5-coordinate geometry to five equivalent Dy3+ atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1982

Autonomous scheduling technology for Earth orbital missions

The development of a dynamic autonomous system (DYASS) of resources for the mission support of near-Earth NASA spacecraft is discussed and the current NASA space data system is described from a functional perspective. The future (late 80's and early 90's) NASA space data system is discussed. The DYASS concept, the autonomous process control, and the NASA space data system are introduced. Scheduling and related disciplines are surveyed. DYASS as a scheduling problem is also discussed. Artificial intelligence and knowledge representation is considered as well as the NUDGE system and the I-Space system.

Srivastava, S.↗