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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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Equivalence of optimal control problems and transformation of optimal control problems with compact control regions into Lagrange problems
Equivalent blackbody temperature and reflectance patterns of model clouds computed by changing radiometer field of view
Absorbed dose and dose equivalent from negatively and positively charged pions in energy range 10 to 2000 MeV
Equivalent excited-state temperature of high pressure plasma calculated for unequal electron and gas temperature, considering ion and electron recombination
Atomic Russell-Saunders coupling states classification from equivalent electrons configurations, using Young diagrams method
Rank permutation codes equivalence to binary code class capable of generation and detection through direct and inverse transformations respectively
Dynamic noise performance equivalence of phase locked or double superheterodyne tracking loops, using noise free external generator
Composition distribution and equivalent body shape for reacting, coaxial, supersonic hydrogen air flow
Mass matrix and resonant frequencies for generating equivalent spring-mass models for normal modes of structural subsystem
Equivalent measurements, observability, and calibration accuracy limits in linear estimation and application to orbital position estimation
Equivalence of perturbation theories of Hori and Deprit, based on Poisson brackets, and computer calculations through sixth order
Small tissue equivalent ionization chamber quartz fiber electrometer dosimeter system, for use as space qualified radiation detection instruments
Absorbed dose equivalent from high energy neutrons and protons incident on tissue, using nucleon- meson cascade calculations
Hori and Deprit perturbation theories comparison based on Poisson brackets, giving computer program determining functions through sixth order for equivalence proof
PSK signals time division multiplexing and frequency multiplexed subcarrier systems equivalence and efficiency for digital communications
Quantitative equivalence model in planet-satellite formation within Jupiter and Uranus systems
Monte Carlo calculations have been carried out to determine the absorbed dose and dose equivalent for 592-MeV protons incident on a cylindrical phantom and for neutrons from 580-MeV proton-Be collisions incident on a semi-infinite phantom. For both configurations, the calculated depth dependence of the absorbed dose is in good agreement with experimental data.
In comparing different techniques for multiplexing N binary data signals into a single channel, time-division multiplexing (TDM) is known to have a theoretic efficiency of 100 percent (neglecting sync power) and thus seems to outperform frequency-division multiplexing systems (FDM). By considering more general FDM systems, we will show that both TDM and FDM are equivalent and have an efficiency of 100 percent. The difference between the systems is in the multiplexing and demultiplexing subsystems, but not in the performance or in the generated waveforms.