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Results for “Measurement”
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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Constrained Voronoi models for interpreting surface microstructural measurements
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Transport properties of SrCo0.9Nb0.1O3-δ and SrCo0.9Ta0.1O3-δ mixed conductors determined by combined oxygen permeation measurement and phenomenological modeling
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Wide-ranging absolute viscosity measurements of sub- and supercritical 1,1,1-trifluoroethane (R143a)
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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.
Test of Ultra Fast Silicon Detectors for picosecond time measurements with a new multipurpose read-out board
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Measurement of transformer ratio from ramped beams in the blowout regime
We present the plans for a UCLA-Argonne collaborative plasma wakefield acceleration (PWFA) experiment aimed at demonstrating the dependence of transformer ratio - the relation between maximum acceleration observed in a plasma wake to the maximum deceleration of the driving beam - on beam shape. Utilizing the unique capabilities of the emittance exchange (EEX) beamline, we may obtain transformer ratios in excess of six in a 120 MeV/m PWFA. These experiments are a crucial step in enabling applications ranging from compact X-ray free electron laser (FEL) light sources to TeV-class linear colliders for high energy physics.
Differential cross section measurements of the 6.13 MeV gamma ray from proton-induced reaction of fluorine
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Wire-mesh sensors: A review of methods and uncertainty in multiphase flows relative to other measurement techniques
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High-fidelity velocity measurements in a totally blocked interior subchannel of a wire-wrapped 61-pin hexagonal fuel bundle
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The permittivity and refractive index measurements of doped barium titanate (BT-BCN)
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