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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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Asymptotic fixed point theorems and periodic systems of functional-differential equations
Long period libration of trojan minor planet
Cavity-mounted log-periodic monopole antenna analyzed by computer
Radiation patterns of log periodic monopole antennas
Periodic earth-moon orbits in restricted three body problem
Periodicity analysis for biometeorology research
Formulas for long period terms due to seventh, ninth, and eleventh zonal harmonics in disturbing function of earth - artificial earth satellite
Lunar and solar long period effects on motion and orbit stability of satellites
Long period lunar and solar effects on motion of artificial satellite
Long period perturbation effects on satellite motion by ellipticity of earth equator
Periodic orbits in restricted three-body problem
Sighting data and trajectory analysis for mission to periodic comets
Second order forced nonlinear oscillation differential equation with time-dependent term not even, having infinity of periodic solutions
Periodic motions in Banach space and applications to autonomous functional-differential equations
Diurnal periodic changes in human electroencephalogram
Fortran IV computer program to evaluate natural frequencies and unstable values of thrust frequency for circular cylindrical shell subjected to periodically varying end thrust
Nonlinear regression and variance analyses of periods defined by irregular observations
Periodic solutions of differential equations with time lag containing small parameter