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At least 937 records · Page 52
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ti10Bi(Pb3O10)3 by Materials Project

Ti10Bi(Pb3O10)3 is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are ten inequivalent Ti+3.90+ sites. In the first Ti+3.90+ site, Ti+3.90+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.78–2.50 Å. In the second Ti+3.90+ site, Ti+3.90+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.78–2.49 Å. In the third Ti+3.90+ site, Ti+3.90+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.78–2.52 Å. In the fourth Ti+3.90+ site, Ti+3.90+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.78–2.51 Å. In the fifth Ti+3.90+ site, Ti+3.90+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.78–2.50 Å. In the sixth Ti+3.90+ site, Ti+3.90+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.77–2.50 Å. In the seventh Ti+3.90+ site, Ti+3.90+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.78–2.52 Å. In the eighth Ti+3.90+ site, Ti+3.90+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.77–2.50 Å. In the ninth Ti+3.90+ site, Ti+3.90+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.78–2.52 Å. In the tenth Ti+3.90+ site, Ti+3.90+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.78–2.52 Å. There are nine inequivalent Pb2+ sites. In the first Pb2+ site, Pb2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.51–2.85 Å. In the second Pb2+ site, Pb2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.50–2.85 Å. In the third Pb2+ site, Pb2+ is bonded in a 12-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.52–2.87 Å. In the fourth Pb2+ site, Pb2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.51–2.84 Å. In the fifth Pb2+ site, Pb2+ is bonded in a 12-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.52–2.87 Å. In the sixth Pb2+ site, Pb2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.51–2.84 Å. In the seventh Pb2+ site, Pb2+ is bonded in a 12-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.52–2.87 Å. In the eighth Pb2+ site, Pb2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.52–2.83 Å. In the ninth Pb2+ site, Pb2+ is bonded in a 12-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.51–2.87 Å. Bi3+ is bonded in a 4-coordinate geometry to eight O2- atoms. There are a spread of Bi–O bond distances ranging from 2.29–2.85 Å. There are thirty inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Ti+3.90+ and two Pb2+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two Ti+3.90+ and four Pb2+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the ninth O2- site, O2- is bonded in a distorted single-bond geometry to two Ti+3.90+ and four Pb2+ atoms. In the tenth O2- site, O2- is bonded in a distorted single-bond geometry to two Ti+3.90+ and four Pb2+ atoms. In the eleventh O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the twelfth O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the thirteenth O2- site, O2- is bonded in a distorted single-bond geometry to two Ti+3.90+ and four Pb2+ atoms. In the fourteenth O2- site, O2- is bonded in a 4-coordinate geometry to two Ti+3.90+, one Pb2+, and one Bi3+ atom. In the fifteenth O2- site, O2- is bonded in a distorted single-bond geometry to two Ti+3.90+, three Pb2+, and one Bi3+ atom. In the sixteenth O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the seventeenth O2- site, O2- is bonded in a 4-coordinate geometry to two Ti+3.90+, one Pb2+, and one Bi3+ atom. In the eighteenth O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the nineteenth O2- site, O2- is bonded in a 4-coordinate geometry to two Ti+3.90+, one Pb2+, and one Bi3+ atom. In the twentieth O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the twenty-first O2- site, O2- is bonded in a distorted single-bond geometry to two Ti+3.90+ and four Pb2+ atoms. In the twenty-second O2- site, O2- is bonded in a distorted single-bond geometry to two Ti+3.90+, three Pb2+, and one Bi3+ atom. In the twenty-third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Ti+3.90+ and two Pb2+ atoms. In the twenty-fourth O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the twenty-fifth O2- site, O2- is bonded in a distorted single-bond geometry to two Ti+3.90+, three Pb2+, and one Bi3+ atom. In the twenty-sixth O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the twenty-seventh O2- site, O2- is bonded in a distorted single-bond geometry to two Ti+3.90+ and four Pb2+ atoms. In the twenty-eighth O2- site, O2- is bonded in a 4-coordinate geometry to two Ti+3.90+, one Pb2+, and one Bi3+ atom. In the twenty-ninth O2- site, O2- is bonded in a 2-coordinate geometry to two Ti+3.90+ and two Pb2+ atoms. In the thirtieth O2- site, O2- is bonded in a distorted single-bond geometry to two Ti+3.90+, three Pb2+, and one Bi3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrTi(PbO3)2 by Materials Project

ZrTi(PbO3)2 is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the tetragonal P4mm space group. The structure is three-dimensional. Zr4+ is bonded to six O2- atoms to form distorted corner-sharing ZrO6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are a spread of Zr–O bond distances ranging from 1.99–2.44 Å. Ti4+ is bonded in a 5-coordinate geometry to five O2- atoms. There is one shorter (1.75 Å) and four longer (1.99 Å) Ti–O bond length. Pb2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.54–2.93 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Zr4+, one Ti4+, and two equivalent Pb2+ atoms. In the second O2- site, O2- is bonded in a single-bond geometry to one Ti4+ and four equivalent Pb2+ atoms. In the third O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Zr4+ and four equivalent Pb2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgTi2Nb2(PbO3)5 by Materials Project

MgTi2Nb2(PbO3)5 is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the monoclinic Cm space group. The structure is three-dimensional. Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with six NbO6 octahedra. The corner-sharing octahedra tilt angles range from 0–19°. There are a spread of Mg–O bond distances ranging from 2.06–2.35 Å. There are two inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.78–2.42 Å. In the second Ti4+ site, Ti4+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.79–2.43 Å. There are two inequivalent Nb5+ sites. In the first Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with three equivalent MgO6 octahedra. The corner-sharing octahedra tilt angles range from 5–12°. There are a spread of Nb–O bond distances ranging from 1.95–2.13 Å. In the second Nb5+ site, Nb5+ is bonded to six O2- atoms to form distorted NbO6 octahedra that share corners with three equivalent MgO6 octahedra. The corner-sharing octahedra tilt angles range from 0–19°. There are a spread of Nb–O bond distances ranging from 1.87–2.44 Å. There are five inequivalent Pb2+ sites. In the first Pb2+ site, Pb2+ is bonded in a 12-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.59–2.95 Å. In the second Pb2+ site, Pb2+ is bonded in a 12-coordinate geometry to ten O2- atoms. There are a spread of Pb–O bond distances ranging from 2.54–3.19 Å. In the third Pb2+ site, Pb2+ is bonded in a 12-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.51–2.95 Å. In the fourth Pb2+ site, Pb2+ is bonded in a 12-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.52–2.93 Å. In the fifth Pb2+ site, Pb2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.57–2.96 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Ti4+, one Nb5+, and four Pb2+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two Ti4+ and four Pb2+ atoms. In the third O2- site, O2- is bonded in a 1-coordinate geometry to one Ti4+, one Nb5+, and four Pb2+ atoms. In the fourth O2- site, O2- is bonded in a distorted linear geometry to one Mg2+, one Nb5+, and four Pb2+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Mg2+, one Nb5+, and four Pb2+ atoms. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to one Mg2+, one Nb5+, and two Pb2+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one Ti4+, one Nb5+, and two Pb2+ atoms. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to two Ti4+ and two Pb2+ atoms. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to one Ti4+, one Nb5+, and two Pb2+ atoms. In the tenth O2- site, O2- is bonded in a 2-coordinate geometry to one Mg2+, one Nb5+, and three Pb2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2019

Materials Data on HfTi4(PbO3)5 by Materials Project

HfTi4(PbO3)5 is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the orthorhombic Pmm2 space group. The structure is three-dimensional. Hf4+ is bonded to six O2- atoms to form distorted corner-sharing HfO6 octahedra. The corner-sharing octahedra tilt angles range from 0–21°. There are a spread of Hf–O bond distances ranging from 1.98–2.35 Å. There are two inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Ti–O bond distances ranging from 1.77–2.02 Å. In the second Ti4+ site, Ti4+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Ti–O bond distances ranging from 1.76–2.02 Å. There are three inequivalent Pb2+ sites. In the first Pb2+ site, Pb2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.52–2.87 Å. In the second Pb2+ site, Pb2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.51–2.86 Å. In the third Pb2+ site, Pb2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.52–2.86 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Hf4+ and four equivalent Pb2+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Ti4+ and four Pb2+ atoms. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Ti4+ and four Pb2+ atoms. In the fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Hf4+ and two equivalent Pb2+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ti4+ and two Pb2+ atoms. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ti4+ and two Pb2+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one Hf4+, one Ti4+, and two equivalent Pb2+ atoms. In the eighth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Ti4+ and two equivalent Pb2+ atoms. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ti4+ and two equivalent Pb2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrTi(PbO3)2 by Materials Project

ZrTi(PbO3)2 is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the tetragonal P4mm space group. The structure is three-dimensional. Zr4+ is bonded in a 5-coordinate geometry to five O2- atoms. There are one shorter (1.98 Å) and four longer (2.09 Å) Zr–O bond lengths. Ti4+ is bonded to six O2- atoms to form distorted corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles are 16°. There are a spread of Ti–O bond distances ranging from 1.76–2.36 Å. There are two inequivalent Pb2+ sites. In the first Pb2+ site, Pb2+ is bonded in a 12-coordinate geometry to eight O2- atoms. There are four shorter (2.56 Å) and four longer (2.90 Å) Pb–O bond lengths. In the second Pb2+ site, Pb2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.52 Å) and four longer (2.90 Å) Pb–O bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ti4+ and two equivalent Pb2+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Zr4+ and two equivalent Pb2+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Zr4+, one Ti4+, and four equivalent Pb2+ atoms. In the fourth O2- site, O2- is bonded in a single-bond geometry to one Ti4+ and four equivalent Pb2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe2H10Cl6O5 by Materials Project

FeCl4FeCl2(H2O)4H2O is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the orthorhombic Pca2_1 space group. The structure is zero-dimensional and consists of four 13478-10-9 molecules, four tetrachloroiron molecules, and four water molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgSi(HO2)2 by Materials Project

MgSiO2(OH)2 is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the monoclinic Pm space group. The structure is three-dimensional. Mg2+ is bonded to six O2- atoms to form distorted MgO6 octahedra that share corners with eight equivalent SiO6 octahedra and edges with two equivalent MgO6 octahedra. The corner-sharing octahedra tilt angles range from 50–57°. There are a spread of Mg–O bond distances ranging from 2.00–2.20 Å. Si4+ is bonded to six O2- atoms to form SiO6 octahedra that share corners with eight equivalent MgO6 octahedra and edges with two equivalent SiO6 octahedra. The corner-sharing octahedra tilt angles range from 50–57°. There are a spread of Si–O bond distances ranging from 1.71–1.94 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.05 Å) and one longer (1.50 Å) H–O bond length. In the second H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.06 Å) and one longer (1.44 Å) H–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mg2+, one Si4+, and one H1+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Mg2+, two equivalent Si4+, and one H1+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Mg2+, one Si4+, and one H1+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Mg2+, two equivalent Si4+, and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfTi(PbO3)2 by Materials Project

HfTi(PbO3)2 is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the tetragonal I4mm space group. The structure is three-dimensional. Hf4+ is bonded to six O2- atoms to form distorted HfO6 octahedra that share corners with six equivalent TiO6 octahedra. The corner-sharing octahedra tilt angles range from 0–17°. There are a spread of Hf–O bond distances ranging from 1.95–2.38 Å. Ti4+ is bonded to six O2- atoms to form distorted TiO6 octahedra that share corners with six equivalent HfO6 octahedra. The corner-sharing octahedra tilt angles range from 0–17°. There are a spread of Ti–O bond distances ranging from 1.84–2.26 Å. Pb2+ is bonded in a 12-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.57–2.90 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Hf4+, one Ti4+, and two equivalent Pb2+ atoms. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one Hf4+, one Ti4+, and four equivalent Pb2+ atoms. In the third O2- site, O2- is bonded in a distorted linear geometry to one Hf4+, one Ti4+, and four equivalent Pb2+ atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1986

The SIMRAND 1 computer program: Simulation of research and development projects

The SIMRAND I Computer Program (Version 5.0 x 0.3) written in Microsoft FORTRAN for the IBM PC microcomputer and its compatibles is described. The SIMRAND I Computer Program comprises eleven modules-a main routine and ten subroutines. Two additional files are used at compile time; one inserts the system or task equations into the source code, while the other inserts the dimension statements and common blocks. The SIMRAND I Computer Program can be run on most microcomputers or mainframe computers with only minor modifications to the computer code.

Miles, R. F., Jr.↗
DOE OSTI2022

Ultrafast X-ray spectroscopy on nonequilibrium systems (Final Report)

The goal of the project has been to theoretically investigate a wide variety of problems related to the use of X-ray spectroscopy in materials science to enhance the impact of the science done at DOE’s user facilities. The focus has generally been on obtaining a deeper understand of new types of X-ray spectroscopy and to provide support for experimentalist working in these fields.

36 MATERIALS SCIENCE↗
DOE OSTI2010

Multibeam field emission x-ray system with half-scan reconstruction algorithm

Purpose: In this article, the authors propose a multibeam field emission x-ray (MBFEX) system along with a half-scan fan-beam reconstruction algorithm. Methods: The proposed system consists of a linear CNT-based MBFEX source array, a single large area detector that is divided into same number of segments as the number of x-ray beams, a multihole collimator that aligns each beam with a corresponding detector segment, and a sample rotation stage. The collimator is placed between the source and the object to restrict the x-ray radiations through the target object only. In this design, all the x-ray beams are activated simultaneously to provide multiple projection views of the object. The detector is virtually segmented and synchronized with the x-ray exposure and the physiological signals when gating is involved. The transmitted x-ray intensity from each beam is collected by the corresponding segment on the detector. After each exposure, the object is rotated by a step angle until sufficient data set is collected. The half-scan reconstruction formula for MBFEX system is derived from the conventional filtered backprojection algorithm. To demonstrate the advantages of the system and method in reducing motion artifacts, the authors performed simulations with both standard and dynamic Shepp-Logan phantoms. Results: The numerical results indicate that the proposed multibeam system and the associated half-scan algorithm can effectively reduce the scanning time and improve the image quality for a time-varying object. Conclusions: The MBFEX technique offers an opportunity for the innovation of multisource imaging system.

60 APPLIED LIFE SCIENCES↗
NASA NTRS1989

DSN 70-meter antenna microwave optics design and performance improvements. Part 1: Design optimization

The design optimizations associated with the microwave and structural upgrade of the DSN 64-m antennas are discussed. Expected area efficiency/gain performances at S- and X-band are given for both the original 64-m systems and the upgraded 70-m systems, and error estimates are developed. The DSN 70-m Upgrade Project specifications, based on predesign estimates, were 1.4-dB gain at S-band and 1.9-dB at X-band, with no degradation to critical receiving system noise temperatures. The measurements show an S-band gain increase of 1.9 dB and an average increase of 2.1 dB at X-band. The Project also delivered small receiving system noise decreases at both frequency bands. The three DSN 70-m antennas, in the initial state of mechanical adjustment as of the end of calendar year 1988, are performing with very high peak microwave area efficiencies at very nearly the engineering design expectations of 76 percent at S-band and 71 percent at X-band.

Bathker, D. A.↗
NASA NTRS1999

KWIC: A Widefield Mid-Infrared Array Camera/Spectrometer for the KAO

The Kuiper Widefield Infrared Camera (KWIC) is an imaging spectrometer designed for use on the Kuiper Airborne Observator between 18 and 40 microns. The spectral resolution achieving devices are two fully tunable and scanning cryogenic Fabry-Perot interferometers that employ free standing metal mesh as the reflective surfaces. The detective device is a 128 x 128 pixel Si:Sb BIB array manufactured by Rockwell/Boeing for the SIRTF project. The plate scale for KWIC (one pixel subtends 2.73" x 2.73") was chosen so as to more than fully sample the KAO beam (approximately 9" at 31.5 microns), to enable effective image restoration techniques to be applied. Even so, KWIC has a rather large (5.8' x 5.8') field of view. KWIC has both high and low spectral resolution modes that are interchangeable in a few minutes time in flight on the KAO. The high resolution (R = lambda/(delta)lambda = 1000 to 6000) mode is suitable for detecting weak lines in the presence of strong continuum for Galactic sources, and for resolving broad extragalactic lines. The low resolution (R approximately 30 to 100) mode is suitable for imaging in the thermal dust continuum.

Stacey, Gordon J.↗
DOE OSTI2018

Variations in the X-ray Intensity of the Solar Corona and Heating of the Coronal Plasma in the Context of the Quantum Theory of Photon Pairs

Data obtained in the framework of the INTERBALL–Tail Probe (1995–2000) and RHESSI (from 2002 to the present) projects have revealed variations in the X-ray intensity of the solar corona in the photon energy range of 2−15 keV during the period of the quiet Sun. Previously, a hypothesis was proposed that this phenomenon could be associated with the effect of coronal heating. In the present study, a new mechanism of coronal plasma heating is proposed on the basis of the experimental data and the quantum theory of photon pairs that are produced from vacuum in the course of the Universe’s expansion. A similar mechanism based on the splitting of photon pairs in the interplanetary and intergalactic space is also proposed to explain the observed microwave background radiation.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗