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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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First-principles calculations for the mechanical properties of Ti-Nb-B2 solid solutions
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Microstructure evolution and a new mechanism of B2 phase on room temperature mechanical properties of Ti-47Al-2Cr-2Nb alloy prepared by hot isostatic pressing
Highlights: • The microstructure evolution of Ti-47Al-2Cr-2Nb alolly was investigated in detail. • The foramtion of B{sub 2} phase can be adjusted in Ti-47Al-2Cr-2Nb alloy. • A new mechanism of B{sub 2} phase on room temperature mechanical properties of Ti-47Al-2Cr-2Nb alloy was proposed. - Abstract: The formation of B{sub 2} phase was adjusted via various hot isostatic pressing processes in Ti-47Al-2Cr-2Nb alloy. The microstructure evolution and a new mechanism of B{sub 2} phase on room temperature mechanical properties was investigated by BSE, EBSD and TEM in detail. The result shows that the formation of B{sub 2} phase leads to Cr element content decrease in γ matrix phase, which results in lattice parameter increase, namely the c/a ratio of γ matrix phase. Finally, at room temperature the mechanical properties of Ti-47Al-2Cr-2Nb alloy deteriorates.
Aerosol Chemical Speciation Monitor, mentor processed, b2
ARM AOS data from the Aerosol Chemical Speciation Monitor (ACSM). Data processed by the mentor.
AOS: Oxides of Nitrogen Analyzer with Cavity Attenuated Phase Shift Technology (b2-level)
AOS: Oxides of Nitrogen Analyzer with Cavity Attenuated Phase Shift Technology
Multiwavelength study of Fermi hard spectrum blazar B2 0806+35 using Swift, Fermi, and TACTIC observations
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Voyager capsule phase B. Volume III - Surface laboratory system. Part B2 - Alternatives, analyses, selection Final report
Voyager capsule surface laboratory system - subsystem design analysis
Evidence for an optically thick component in the galactic radio source Sagittarius B2
Galactic radio source Sagittarius optically thick component evidence based on flux density measurement
Results of the RAM B2 materials-addition flight experiment
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Survey of molecular lines near the galactic center. I - 6-centimeter formaldehyde absorption in Sagittarius A, Sagittarius B2, and the galactic plane from 359.4 to 2.2 deg galactic longitude.
The data obtained indicate that the formaldehyde is concentrated in distinct clouds to a much greater extent than atomic hydrogen. The findings suggest that most of the mass in these clouds is in the form of molecular hydrogen. The locations of four dominant clouds are reported. The strongest formaldehyde features are apparently associated with the galactic nucleus. Estimates of the hydrogen density in the clouds, based on the assumption of stability and also on a comparison with local dark clouds, indicate a number density in the range from 1000 to 10,000 per cc, and a mass of approximately 500,000 solar masses.
On the substrate specificity of cathepsins B1 and B2 including a new fluorogenic substrate for cathepsin B1
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Nimbus-B2 scheduled for launch
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High-resolution far-infrared observations of H II regions - Sagittarius B2, W49, DR 21-W75
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The hydrogen lines in the high-luminosity quasar B2 1225+31
The emission lines H-alpha, H-beta + forbidden O III, and L-alpha have been observed in the high-redshift quasar 1225+31. The ratios of line intensities in 1225+31 are found to be approximately 0.8 for L-alpha/H-alpha, about 4 for H-alpha/(H-beta + forbidden O III), and between 4 and 10 for H-alpha/H-beta. The observed value of L-alpha/H-alpha agrees well with the ratio derived by Baldwin (1977) on the basis of a composite quasar spectrum, as well as with direct determination of this ratio in 3C 273 and PKS 0237-23. The ratio H-alpha/H-beta is in the range of values found for a sample of low-redshift quasars by Baldwin (1975). The low value for the L-alpha/H-alpha ratio cannot be reasonably explained by foreground extinction between the sun and 1225+31.