SEARCH · Engineering Papers
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Critical angle technique for measuring index of refraction of metals that have an index less than unity in extreme ultraviolet
Ionospheric electron content and scale height variations based on elevation angles of refracted satellite signals
Satellite measurement of atmospheric structure by stellar refraction, starlight transmission through atmosphere, and background sky brightness
Refraction index for helium isoelectronic sequence, using frequency dependent dipole polarizability
Jet velocity, temperature and source frequency effects on refraction of sound from harmonic point source in subsonic air jet
Helium refractive index for wavelengths above 600 angstroms calculated by variational method
Graphical method of determining dispersion properties of anisotropic medium, using angular dependence of refractive index
Refraction and intraocular pressure tests of colony chimpanzees - age relationship
Refraction of sound by jet flow or jet temperature
Effects of atmospheric refraction and supersonic aircraft accelerations on sonic boom ground-pressure patterns
Interferometric measurement of large indices of refraction, noting applicability and accuracy
Estimation of refractive index spectra in regions of clear air turbulence
Refraction of sound field of omnidirectional pure tone point source by temperature and velocity fields of 3/4-inch air or nitrogen jet
Seismic refraction measurements, computing statistics for depth to Moho, crustal thickness and upper mantle velocity for geographical and geological provinces
Plane electromagnetic wave reflection and refraction by semiinfinite dielectric medium moving uniformly parallel to surface analyzed for arbitrary incidence plane orientation
Attenuation cross section and refractive index using collision theory, calculating resonance profiles of autoionizing lines based on scattering theory
Amplitude distributions of refractive index differences showing spikes superimposed on variations continuum due to water vapor clustering
An approach to lens design is described in which the ratio of the group velocity to the speed of light (the group index) in glass is used, in conjunction with the more familiar phase index of refraction, to control certain chromatic properties of a system of thin lenses in contact. The first-order design of thin-lens systems is illustrated by examples incorporating the methods described.