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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 55 records · Page 3

Communications satellite no. 2 (CS-2)

The purpose of the Japanese CS-2 satellite is to provide national communications and industrial communications, such as special emergency and remote communications, and to contribute to the development of technology pertaining to communications satellites. Description and operating parameters of the following satellite components are presented: structure, communications system, telemetry/command system, electric power system, attitude and antenna control system, secondary propulsion system, apogee motor, framework, and heat control system.

Source record↗

Cell Science 2 (CS-02) Payload Overview

This payload overview presentation will be presented at the POIWG on October 17th, 2017. It provides a high-level overview of Cell Science-02 operations.

Cell Scienc↗

Straintronic Effect on Phonon-Mediated Superconductivity of Nb 2 CT 2 (T = O, S, Se, or Te) MXenes

Here, the electronic structures, phonon dispersions, and electron–phonon coupling of Nb 2 CT 2 (T = O, S, Se, or Te) MXenes were investigated via first-principles calculations. Different models of Nb 2 CT 2 were constructed, and the results show that the low-energy models of Nb 2 CT 2 are intrinsic phonon-mediated superconductors. Of the four Nb 2 CT 2 MXenes, Nb 2 CO 2 MXene exhibits the largest superconducting critical temperature ($T_c$) of 14.43 K. The existence of soft modes induced by Kohn anomalies and the contribution of Nb atoms to the Fermi level lead to strong electron–phonon coupling (λ = 0.92) in Nb 2 CO 2 MXene. The $T_c$ of Nb 2 CO 2 is further enhanced by biaxial tensile strain and reaches up to 18.28 K under 4% tensile strain. The predicted $T_c$ of Nb 2 CS 2 is 4.5 K, which is comparable with experimental data. These findings will further stimulate the search for superconducting MXenes.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗

Resonant x-ray emission across the L 3 edge of uranium compounds

A narrow bandwidth x-ray beamline and a multi-crystal von Hamos spectrometer were used to record x-ray absorption and x-ray emission (XES) across the uranium L 3 edge of UO 2 , UO 3 , Cs 2 UO 2 Cl 4 , and Cs 2 UCl 6 . Measurements were made over 17150–17250 eV with an instrumental resolution of ∼2 eV. This resolution allowed the use of Lorentzian peak fits to the L 3 N 4 and L 3 N 5 characteristic x-ray fluorescence lines that have ∼12–13 eV lifetime widths. The fluorescence yields of the four compounds display strong white lines near threshold and multiple scattering features at higher energies. The XES spectra were fit with three Lorentzians, two for the L 3 N 4 and L 3 N 5 lines and one for inelastic scattering by 2p–6d excitations and 4d–6d final states. The intensities of the white lines were largely due to the inelastic scattering component. To support the measurements, relativistic equation-of-motion coupled-cluster and restricted active space configuration interaction calculations were performed for uranium core-excitation energies in Cs 2 UO 2 Cl 4 and Cs 2 UCl 6 . These calculations with rigorous treatments of relativistic effects are shown to provide accurate uranium L 3 -edge binding energies, L 3 N 5 emission energies, as well as the energy losses in the inelastic scattering process. The measured and calculated results show variations between compounds with U(IV) oxidation states that contain 6d 0 5f 2 electrons in their ground configurations (UO 2 and Cs 2 UCl 6 ) compared with U(VI) compounds (UO 3 and Cs 2 UO 2 Cl 4 ) with empty 5f and 6d configurations.

74 ATOMIC AND MOLECULAR PHYSICS↗

Materials Data on Cs(Zr3I7)2 by Materials Project

Cs(Zr3I7)2 crystallizes in the orthorhombic Cmce space group. The structure is two-dimensional and consists of two Cs(Zr3I7)2 sheets oriented in the (1, 0, 0) direction. Cs1+ is bonded in a 12-coordinate geometry to eight I1- atoms. There are a spread of Cs–I bond distances ranging from 3.96–4.21 Å. There are two inequivalent Zr+2.17+ sites. In the first Zr+2.17+ site, Zr+2.17+ is bonded to five I1- atoms to form corner-sharing ZrI5 square pyramids. There are a spread of Zr–I bond distances ranging from 2.88–3.10 Å. In the second Zr+2.17+ site, Zr+2.17+ is bonded in a distorted see-saw-like geometry to four I1- atoms. All Zr–I bond lengths are 2.93 Å. There are five inequivalent I1- sites. In the first I1- site, I1- is bonded in a 2-coordinate geometry to two Zr+2.17+ atoms. In the second I1- site, I1- is bonded in a distorted bent 120 degrees geometry to two equivalent Zr+2.17+ atoms. In the third I1- site, I1- is bonded in a 3-coordinate geometry to one Cs1+ and two equivalent Zr+2.17+ atoms. In the fourth I1- site, I1- is bonded in a 2-coordinate geometry to one Cs1+ and two equivalent Zr+2.17+ atoms. In the fifth I1- site, I1- is bonded in a 3-coordinate geometry to one Cs1+ and two Zr+2.17+ atoms.

36 MATERIALS SCIENCE↗

Materials Data on Cs(TeO3)2 by Materials Project

Cs(TeO3)2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Cs is bonded to six O atoms to form CsO6 octahedra that share corners with twelve TeO6 octahedra. The corner-sharing octahedra tilt angles range from 64–72°. There are three shorter (3.22 Å) and three longer (3.24 Å) Cs–O bond lengths. There are two inequivalent Te sites. In the first Te site, Te is bonded to six O atoms to form TeO6 octahedra that share corners with six equivalent CsO6 octahedra and corners with six TeO6 octahedra. The corner-sharing octahedra tilt angles range from 42–69°. There is two shorter (1.94 Å) and four longer (1.99 Å) Te–O bond length. In the second Te site, Te is bonded to six equivalent O atoms to form TeO6 octahedra that share corners with six equivalent CsO6 octahedra and corners with six equivalent TeO6 octahedra. The corner-sharing octahedra tilt angles range from 44–72°. All Te–O bond lengths are 2.11 Å. There are two inequivalent O sites. In the first O site, O is bonded in a 2-coordinate geometry to one Cs and two equivalent Te atoms. In the second O site, O is bonded in a 2-coordinate geometry to one Cs and two Te atoms.

36 MATERIALS SCIENCE↗