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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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Electron-phonon interaction in III to V semiconductors and temperature dependence of attenuation in quartz and tourmaline
Electron-phonon attenuation measured in indium arsenide and gallium arsenide single crystals at 10 Kmc and 10 mc as function of temperature
Accurate wide range ultrahigh vacuum gauge calibration method using pressure attenuation, atomic beam, and cryopumping techniques to evaluate system components and performance
X-ray attenuation used for void fraction data in liquid metal boiling
Seismic energy spectrum and attenuation studied in Arizona geological formations for application to lunar surface investigations
Shear wave detection, wave amplitude, velocity, and attenuation in rock formations, seismic measurements, and geophysical studies analog to lunar geology
Method and instruments for measuring seismic energy propagation, velocity, attenuation, frequency spectra, and shear wave velocity in lunar surface rock
Wall vibrations and amplitude attenuations measured in tunnel and cavity formed by underground nuclear explosion
Variable viscosity, variable stiffness dampers using polymeric materials near glass transition temperatures for shock and vibration attenuation in space environment
Photographic pyrometer using variable-density filter noting temperature master curve, attenuation, calibration and error sources
Propagation velocity and attenuation variation effect in coaxial cables on frequency modulated carrier evaluated, using IBM 1620 computer
Thermoelectric power in niobium-zirconium alloys noting phonon drag peak attenuation due to Zr solute addition at very low temperatures
Adaptive on-off communication system for binary data transmission over noisy channel of unknown attenuation
Spheroidal-type seismogram study of wave generation, propagation, dispersion and attenuation in realistic spherical Earth models, especially Gutenberg-Bullen A-prime model
Special purpose electrometer amplifier is capable of operation over a dynamic range of five orders of magnitude. This is achieved by using a zener controlled attenuator in the feedback path for the amplifier.
Properties of the Brewster angle and internal reflection in a dielectric prism are proposed as the basis of a new type of element for use in oversize waveguide in quasi-optical microwave components. Waveguide loss is reduced and precision broadband attenuators, phase shifters, and directional couplers can be constructed on the basis of the properties.
Combined attenuator and latch stops and latches in place a given mass which is to be moved a discrete distance to effect a desired condition. This device is used in a retraction actuator driven by a pyrotechnic thruster, and can be tailored to meet specific design requirements.
Video synchronization processor overcomes poor signal-to-noise ratio which occurs during adverse signal conditions caused by flame attenuation, antenna pattern nulls, and near-horizon tracking. The system maintains sync lock far below the point where excessive noise would normally render the video useless.