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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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Optimum length buffer crystals are used with an amplification section for measuring the noise figure for acoustic amplifiers. Measuring the time required to saturate with noise a signal, which is reflected back and forth in the circuit, gives a direct measurement of the amplifiers noise figure.
Comparison is made of the power consumed and the acoustic amplification realized when a dc bias field is placed across a piezoelectric semiconductor and adjusted to amplify a microwave acoustic signal to the point where the forward gain is just equal to the reverse attenuation. This represents the maximum possible gain condition.
Amplification and maintenance of magnetic fields in turbulent conducting fluids
Microwave amplification in high resistivity GaAs and Gunn effect in GaAs oscillators
Maser amplification as intense OH lines cause in small radiation sources, discussing OH molecules formation and chemical pumping
Traveling wave maser with 6 db amplification at 36 GHz, using Cr ion doped rutile as active material and superconducting magnet for DC magnetic field
Homogeneous dynamics analyzed for Chapman- Ferraro model of magnetosphere surface, noting failure to explain small magnetic disturbances amplification
Beam plasma amplification, harmonic generation, and coupling schemes
Transmission of Alfven waves through earth bow shock based on hydromagnetic shocks theory, discussing amplitude amplification
Filters, formed by combinations of distributed RC elements with positive-feedback voltage amplifiers, provide transfer functions similar to those the heavier LC filters ordinarily employ. They also provide signal amplification.
Transducer consists of a hybrid thin film and a piezoelectric transistor that acts as a stress-sensitive device with built-in gain. It provides a stress/strain transducer that incorporates a signal amplification stage and sensor in a single package.
System for monitoring of fluidic pressures in cranial cavity uses a miniaturized pressure sensing transducer, combined with suitable amplification means, a meter with scale calibrated in terms of pressures between minus 100 and plus 900 millimeters of water, and a miniaturized chart recorder covering similar range of pressures.
Microwave amplification in high resistivity gallium arsenides
Molecular excitation model for maser amplification of emission lines of interstellar hydroxyl radical
Flux gate magnetometer with toroidal gating coil and solenoidal output coil for signal modulation or amplification
Electrostatic drift-dissipative plasma instability and nocturnal equatorial spread F irregularities, discussing amplification in collision dominated medium
Tunable optical parametric oscillators including Gaussian beams amplification, threshold, tuning techniques, spectral output, etc
Atomic physics of lasers and active materials, noting multiplet spectra of atoms, molecular specroscopy, energy level population distribution and amplification