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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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Effects of incident UV light on the surface morphology of MBE grown GaAs
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Light-controlled molecular resistive switching ferroelectric heterojunction
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Covariance Applications in Criticality Safety, Light Water Reactor Analysis, and Spent Fuel Characterization
A new covariance data library based on ENDF/B-VII.1 was recently processed for the SCALE nuclear analysis code system. The multigroup covariance data are discussed here, along with testing and application results for critical benchmark experiments. The cross section covariance library, along with covariances for fission product yields and decay data, is used to compute uncertainties in the decay heat produced by a burned reactor fuel assembly.
Design and expected performance of a fast neutron attenuation probe for light element density measurements
In this paper, we present the design and expected performance of a proof-of-concept 32 channel material identification system. Our system is based on the energy-dependent attenuation of fast neutrons for four elements: hydrogen, carbon, nitrogen and oxygen. We describe a new approach to obtaining a broad range of neutron energies to probe a sample, as well as our technique for reconstructing the molar densities within a sample. The system's performance as a function of time-of-flight energy resolution is explored using a Geant4-based Monte Carlo. Our results indicate that, with the expected detector response of our system, we will be able to determine the molar density of all four elements to within a 20–30% accuracy in a two hour scan time. In many cases this error is systematically low, thus the ratio between elements is more accurate. This degree of accuracy is enough to distinguish, for example, a sample of water from a sample of pure hydrogen peroxide: the ratio of oxygen to hydrogen is reconstructed to within 8±0.5% of the true value. Lastly, with future algorithm development that accounts for backgrounds caused by scattering within the sample itself, the accuracy of molar densities, not ratios, may improve to the 5–10% level for a two hour scan time.
Ultrathin, lightweight and flexible organic light-emitting devices with a high light outcoupling efficiency
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Light regulation of pigment and photosystem biosynthesis in cyanobacteria
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Search for Higgs boson decays into a pair of light bosons in the bbμμ final state in pp collision at s = 13 TeV with the ATLAS detector
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A dispersive estimate of scalar contributions to hadronic light-by-light scattering
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