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Materials Data on InAg(PSe3)2 by Materials Project

AgIn(PSe3)2 crystallizes in the trigonal P-31c space group. The structure is two-dimensional and consists of two AgIn(PSe3)2 sheets oriented in the (0, 0, 1) direction. Ag1+ is bonded to six equivalent Se2- atoms to form AgSe6 octahedra that share edges with three equivalent InSe6 octahedra. All Ag–Se bond lengths are 2.91 Å. In1+ is bonded to six equivalent Se2- atoms to form InSe6 octahedra that share edges with three equivalent AgSe6 octahedra. All In–Se bond lengths are 2.81 Å. P5+ is bonded in a trigonal non-coplanar geometry to three equivalent Se2- atoms. All P–Se bond lengths are 2.22 Å. Se2- is bonded in a 3-coordinate geometry to one Ag1+, one In1+, and one P5+ atom.

36 MATERIALS SCIENCE↗

Materials Data on InAg(PS3)2 by Materials Project

AgInP2S6 crystallizes in the trigonal P-31c space group. The structure is two-dimensional and consists of two AgInP2S6 sheets oriented in the (0, 0, 1) direction. Ag1+ is bonded to six equivalent S2- atoms to form AgS6 octahedra that share edges with three equivalent InS6 octahedra. All Ag–S bond lengths are 2.80 Å. In1+ is bonded to six equivalent S2- atoms to form InS6 octahedra that share edges with three equivalent AgS6 octahedra. All In–S bond lengths are 2.69 Å. P5+ is bonded in a trigonal non-coplanar geometry to three equivalent S2- atoms. All P–S bond lengths are 2.04 Å. S2- is bonded in a 3-coordinate geometry to one Ag1+, one In1+, and one P5+ atom.

36 MATERIALS SCIENCE↗

Materials Data on InAg by Materials Project

AgIn is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ag is bonded in a body-centered cubic geometry to eight equivalent In atoms. All Ag–In bond lengths are 3.04 Å. In is bonded in a body-centered cubic geometry to eight equivalent Ag atoms.

36 MATERIALS SCIENCE↗

Materials Data on InAg(WO4)2 by Materials Project

Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

36 MATERIALS SCIENCE↗

NESC GN&C TDT Workshop on 2D Image Motion Optical Transfer Functions, Pointing Performance Analysis, and Requirements

What You Will Learn: The focus is on payload imaging performance due to pointing motion. Some historical background on pointing performance analysis is given. The Optical Transfer Function (OTF) and Modulation Transfer Function (MTF) are defined. The imaging performance due to pointing motion is measured by image motion optical transfer functions (IM OTF). IM OTFs are defined for displacement, smear, and jitter motions, which are all rigorously defined. Deterministic and Statistical IM OTFs are briefly derived and graphically illustrated and compared. The IM OTFs are parameterized by pointing error metrics(PEM), which are means and covariances of displacement, smear, and jitter. Emphasis is on procedures and algorithms to evaluate the image motion optical transfer functions and pointing error metrics. Three procedures are covered, which depend on whether the pointing error data is from time-domain simulation, frequency-domain analysis, or stochastic modeling. A method to evaluate the relative contribution of disturbance sources and to identify the most significant contributors is presented. The presentation includes pertinent discussion of flexible structures and control-structure interaction. No single book can adequately cover this subject, so a book is not required for the course. A list of selected articles, reports, documents, and books is provided for reference and further study. Mathis kept to the minimum necessary to convey principles; lengthy derivations are left to the reference material. Graphics are used to illustrate concepts. As with any such learning endeavor, the knowledge gained will be retained and strengthened through actual practice.c©2019–2021 Mark E. Pittelkau— 5

NASA Engineering and Safety Center (NESC)↗