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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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Pendular seismic transducer mounted on base plate measures small horizontal displacements of structures subjected to vibration where no fixed reference point is available. Enclosure of transducer in transparent plastic case prevents air currents from disturbing the pendulum balance.
Transistor low noise seismic amplifier for fractional mv signals at ELF in ocean bottom seismographs and magnetic variometer
Wave propagation in continents and adjacent shelf areas used for study of seismic crustal refraction and reflection measurements
Measurement and interpretation of ground vibrations, produced by seismic effect of sonic boom
Electroexplosive devices in Active Seismic Experiment of Apollo Lunar Surface Experiments Package, noting thumper and mortar package
Lunar structure study using seismic waves generated by meteorite impact, examining feasibility for Shoemaker statistics, noting inelastic attenuation
Seismic wave refraction measurements on continental shelf between Cape Hatteras and Cape Fear during East Coast OnShore- OffShore Experiment
Air coupled seismic waves generated by jet fighters flying at high altitudes and supersonic speeds
Seismic refraction study of internal structure of volcanic cinder cone
Sonic boom produced earth particle velocities, noting seismic effect limitation to boom pressure envelope area and earth surface boundary
Apollo 11 passive seismic experiment design and objectives, describing seismometer characteristics and lunar interior
Multiple filter technique for seismic multimode dispersed signals, checking time and frequency resolution by diagnostic diagram
Miniaturized seismic refraction system for manned lunar landings consisting of geophones, three channel amplifier, calibrator and logarithmic compressor
Passive seismic experiment design changes and tests for Viking Mars Program
Passing surface vehicle identification using seismic signal analysis and weight estimation
Seismicity in Cascade Mountains and vicinity, Oregon
Seismic analysis of lunar module impact and missile-earth impact, comparing recorded signal parameters
Seismic refraction profiles of ash flow in Valley of Ten Thousand Smokes, Alaska, obtaining P wave velocities