Sufficient conditions for optimal fixed-time impulsive trajectories
Optimal fixed-time impulsive transfer trajectories minimizing characteristic orbital velocity, determining sufficient conditions
Lion, P. M.↗
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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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High specific impulse gas-core reactors
Calculated estimates of gas core nuclear rocket engine weights for specific impulses ranging from 3000 to 7000 seconds and for engine thrusts ranging from 4400 to 440,000 newtons
Ragsdale, R. G.↗
Sonic radiation from a circular piston with impulse excitation
Sonic pressure as function of space and time calculated for radiation from circular piston with impulse excitation
Bess, L.↗
The magnetic field component of the neural impulse Final report
Existence of electric and magnetic field component associated with transmission of neuronal impulse studied in isolated sciatic nerves of frogs
Seipel, J. H.↗
Theory of higher order optimum impulsive solutions
Higher order optimum impulsive solutions to space trajectory problems with off-on thrust magnitude control
Andrus, J. F.↗
A linearized solution to impulsive latent heat release in a dilute, isothermal atmosphere
One dimensional model for analytical solution to problem of impulsive heat release by chemically generated waves in dilute, isothermal atmosphere
Eberstein, I. J.↗
Crew radiation dose from the plume of a high impulse gas-core nuclear rocket during a Mars mission
Crew radiation dose from plume of high impulse gas-core nuclear rocket during Mars mission
Masser, C. C.↗
Sudden impulses in the geomagnetotail and the vicinity
Explorer 33 observations of sudden impulses propagating in geomagnetic tail and magnetosheath
Patel, V. L.↗
Sudden impulses in the magnetosphere observed at synchronous orbit
Sudden impulses in geomagnetic field, discussing synchronous equatorial orbit-satellite magnetometer observations
Coleman, P. J., Jr.↗
Spectral characteristics of impulsive solar- flare X-rays greater than or approximately 10 keV
Impulsive solar flare X rays spectral characteristics, examining electron energy, bremsstrahlung, microwave bursts and particle escape, collisions and injection
Anderson, K. A.↗
The noisiness of impulsive sounds
Impulsive sound signals perceived noisiness in anechoic chamber, investigating duration, intersignal interval, repetition and frequency effects
Fidell, S.↗
Application of an impulsive trajectory optimization method to the comet rendezvous problem
Multiple impulsive spacecraft trajectory optimization technique application to comet rendezvous problem, using computer program
Waters, J. I.↗
Impulsive hard X-ray and ultraviolet emission during solar flares
Impulsive hard X ray and far UV emission during solar flares
Donnelly, R. F.↗
Minimum delta-V, three-impulse, non-coplanar transfer from a circular parking orbit onto an asymptotic velocity vector for small declination angles - An approach to the trans-Mars launch window problem
Trans-Mars launch window problem, discussing minimum delta-V three-impulse noncoplanar transfer from circular parking orbit onto asymptotic velocity vector
Bean, W. C.↗
Inequality constraints in primer-optimal, N-impulse solutions
Inequality constraints in primer optimal N impulse solutions, introducing penalty function and its gradient with respect to control variables
Faust, N. L.↗
Large impulses of self-magnetic origin
Self magnetic impulses in gas discharge configuration as function of current and anode- cathode radii ratio
Garrison, R. L.↗
Guidance and navigation requirements for unmanned flyby and swingby missions to the outer planets. Volume 2: impulsive high thrust missions, phase A
The impulsive, high thrust missions portion of a study on guidance and navigation requirements for unmanned flyby and swingby missions to the outer planet is presented. The proper balance between groundbased navigational capability, using the deep space network (DSN) alone, and an onboard navigational capability with and without supplemental use of DSN tracking, for unmanned missions to the outer planets of the solar system is defined. A general guidance and navigation requirements program is used to survey parametrically the characteristics associated with three types of navigation systems: (1) totally onboard, (2) totally Earth-based, and (3) a combination of these two.
Source record↗
Neutronics analysis of an open-cycle high-impulse gas core reactor concept
A procedure was developed to calculate the critical fuel mass, including the effects of propellant pressure, for coaxial-flow gas-core reactors operating at 196,600 newtons thrust and 4400 seconds specific impulse. Data were generated for a range of cavity diameter, reflector-moderator thickness, and quantity of structural material. Also presented are such core characteristics as upper limits on cavity pressure, spectral hardening in very-high-temperature hydrogen, and reactivity coefficients.
Whitmarsh, C. L., Jr.↗