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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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Multispectral and multitemporal digital imagery spatial registration using fast Fourier transform techniques, applying to earth resources satellite imagery preprocessing
Fast neutron energy spectrum and flux, using balloon flight neutron detector with charged particle rejection scheme and pulse shape discriminator for gamma rays separation
Galactic cosmic rays solar modulation effects on fast neutron flux in atmosphere
Atmospheric fast neutron flux, discussing solar proton events and Forbush decreases effects
Sensitive fast response scintillation electron detector for use with signal energy analyzer
Cross sections for simultaneous ionization and charge transfer in fast proton-helium atom collisions, using Born approximation
Alfven waves effect on MHD fast shock from numerical solution of extended Rankine-Hugoniot equations
High energy fast Grand Tour multiplanet flyby missions to outer planets omitting Jupiter, noting identical arrival date at Neptune
Radiation induced visual phosphenes observed by dark adapted human subjects in fast neutron, X ray and positive pion beams at Berkeley comparative to primary cosmic ray effects
Spectrometer slit-width cancellation by Doppler shift of light emission by fast ion beams, resulting in spectral lines increased intensities
Fast burning rates in thin film solid composite propellants composed of McCormick-Selph 510, 164 monopropellant, oxidizer and polyvinyl chloride binder
Compact fast reactor design for space power with rotating fuel drums, Mo alloy reflectors and honeycomb support structure
Fast neutron spectra in lead and water shielded reactor, comparing liquid scintillator measurements with discrete ordinates code calculations
Materials technology of Ta-W-Hf clad uranium mononitride fuel for lithium cooled compact fast space power reactor, including irradiation tests
Densitometer was developed which produces linear voltage proportional to changes in density of flowing liquid hydrogen. Unit has fast response time and good system stability, statistical variation, and thermal equilibrium. System accuracy is 2 percent of total density span. Basic design may be altered to include measurement of other flowing materials.
During the development of a delayed coincidence apparatus for the study of atomic decays, the need arose for a bright, fast, and inexpensive light source with known decay characteristics. A sample of P-15 phosphor was obtained for use as a calibration light source. A short pulse duration was employed to preferentially excite the short lifetime components relative to the longer-lived ones. The computer analysis revealed that the raw MCA decay curve data could be described well by a sum of three exponentials with decay times of about 88 nsec, about 6.5 nsec, and 1.04 + or - 2%.
Tradeoff studies to determine the design requirements for a fast response solar array simulator capable of delivering output power in the range of 20 to 5000 watts are reported. The studies were divided into four major areas: frequency and transient response considerations, digital versus analog characteristic generation and programming, optimum power module size, and accuracy considerations. Based on an evaluation of the tradeoffs, a reference design was selected with a forward biased solar cell as an analog reference, and with current accuracy of + or - 0.5% of the short circuit setting.
A fast electron gun with subanosecond rise- and decay-times and 100 ma. peak beam current has been developed for delayed coincidence studies of atomic decays. The gun is fabricated from an inexpensive tetrode Nuvistor, involving only slight modification.