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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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Simple circuit monitors the frequency of PFM /Pulse Frequency Modulated/ telemetry signals. This discriminator can be used as a constant current integrator in such circuits as linear sweep and time delay.
Frequency discriminator has a binary output and permits microminiaturized packaging techniques. It uses a bandpass amplifier and standard logic elements that convert two input frequencies into two discrete logic pulses.
Hydrogen fire detection system discovers fires by detecting the flickering ultraviolet radiation emitted by the OH molecule, a short-lived intermediate combustion product found in hydrogen-air flames. In a space application, the system discriminates against false signals from sunlight and rocket engine exhaust plume radiation.
Feedback system employing a digital logic comparator to detect and correct amplifier drift provides stable gain characteristics for nanosecond amplifiers used in counting applications. Additional anticoincidence logic enables application of the regulation circuit to the amplifier and discriminator while they are mounted in an operable circuit.
Intrinsic organization of cerebral tissue in alerting, orienting and discriminative responses
Electrophysiological patterns and cerebral impedance characteristics in orienting and discriminative behavior
Correlation of like and cross polarized side- looking radar images with geologic features for terrain discrimination
Electric impedance measurements in hippocampus, amygdala and midbrain reticular formation during altering, orienting and discriminative responses in cat
Retention of position discrimination after regeneration in planarians
Electronic filtering system discriminates between true corneal and false reflections, solving the problem of spurious reflections of the CRT light in newly designed oculometer.
Digital comparator permits discrimination at accuracy of reference frequency. The compare circuit is a shift register element.
Transistor biased amplifier has a biased diode discriminator driven by a high impedance /several megohms/ current source, rather than a voltage source with several hundred ohms output impedance. This high impedance input arrangement makes the incremental impedance of the threshold diode negligible relative to the input impedance.
Reinforcing effect of informative stimulus that is not positive discriminative stimulus
Photomultiplier gate for stimulated spontaneous light scattering discrimination, showing high cut- off efficiency, linearity and absence of spurious effect
Successive comparisons method used for distance discrimination tests in simulated space environment
Electrophysiological study of sound localization and auditory discrimination in monkeys
Human performance measured as function of reaction time required to discriminate change in beacon brightness