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DOE OSTI2020

Materials Data on NpSi by Materials Project

NpSi crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Np4+ sites. In the first Np4+ site, Np4+ is bonded to six equivalent Si4- atoms to form distorted edge-sharing NpSi6 pentagonal pyramids. There are two shorter (2.90 Å) and four longer (2.93 Å) Np–Si bond lengths. In the second Np4+ site, Np4+ is bonded in a 8-coordinate geometry to eight equivalent Si4- atoms. There are four shorter (2.95 Å) and four longer (3.07 Å) Np–Si bond lengths. Si4- is bonded in a 9-coordinate geometry to seven Np4+ and two equivalent Si4- atoms. There are one shorter (2.43 Å) and one longer (2.45 Å) Si–Si bond lengths.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on NpSi by Materials Project

NpSi crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Np4+ is bonded in a 8-coordinate geometry to two equivalent Np4+ and six equivalent Si4- atoms. Both Np–Np bond lengths are 2.57 Å. There are a spread of Np–Si bond distances ranging from 2.89–3.03 Å. Si4- is bonded in a 10-coordinate geometry to six equivalent Np4+ and four equivalent Si4- atoms. There are two shorter (2.50 Å) and two longer (2.57 Å) Si–Si bond lengths.

36 MATERIALS SCIENCE↗

NASA NTRS1993

A packet switched communications system for GRO

This paper describes the packet switched Instrumenters Communication System (ICS) that was developed for the Command Management Facility at GSFC to support the Gamma Ray Observatory (GRO) spacecraft. The GRO ICS serves as a vital science data acquisition link to the GRO scientists to initiate commands for their spacecraft instruments. The system is ready to send and receive messages at any time, 24 hours a day and seven days a week. The system is based on X.25 and the International Standard Organization's (ISO) 7-layer Open Systems Interconnection (OSI) protocol model and has client and server components. The components of the GRO ICS are discussed along with how the Communications Subsystem for Interconnection (CSFI) and Network Control Program Packet Switching Interface (NPSI) software are used in the system.

Husain, Shabu↗