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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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Nondissipative dc to dc regulator converter - magnetic study, pulse width and frequency modulation, square wave sources, power losses in saturated transformers, and output filter
Electronic circuit drives sine function generator using square wave and sawtooth sweep generators. The circuit replaces electromechanical driver and increases accuracy.
Sine current screening and ac square wave tests to evaluate magnetic and electrical properties of materials for use as magnetic components in static converters and inverters
Solid state circuit generating adjustable square wave pulses of sufficient power operates a 28 volt dc solenoid valve at precise time intervals. This circuit is used for precise time control of fluid flow in combustion experiments.
Excitation of the glow discharge probes with a high peak-to-peak voltage square wave reduces instability of density sensors. This results in good probe life plus output stability over a wide range.
Oscilloscope used as an X-Y plotter or two-dimensional analyzer tags each point with a yes or no, depending on a third parameter. The usual square-wave pulse is replaced on the scope by a single information-bearing dot which lengthens to a dash in response to a simultaneous event.
Generator produces dynamic test signals in the range from 0.0001 and 10 to the minus 12th power amperes. It involves an extension of the technique of applying a triangular voltage waveform to a small capacitor to obtain a square-wave output current. The effects of stray capacitance are minimized by appropriate shielding.
Small magnetic amplifiers pass square waves through transformers and provide regulation by varying the pulse width on the secondary of the output power transformers. This pulse duration modulation is provided by a control rectifier technique or a phase-shift technique.
Molecular beam research - square-wave phase modulation in molecular beam resonance studies and search for shift in transverse electromagnetic mass of electron
Program studies materials for use in static inverters and converters. It gives suitable data on the behavior of commonly used materials when excited with square wave power.
Estimating phase or time lag of square wave in white noise, and analysis of narrow band signals through bandpass soft limiters
Evaluation of magnetic materials for static inverters and converters, tested under square wave excitation and direct current excitation
Synchronization in coded communication systems, considering phase lock loop and square wave correlation function
Diathermy instrument using solid state circuits to provide square wave pulses, discussing operating parameters for bipolar coagulation and advantages over spark gap instruments
Feasibility and engineering studies on inverter-motor systems using alternating current induction type motors and quasi-square wave output inverters
High efficiency oscillator using avalanche square wave diode, considering case of silicon p-i-n diode
Nucleate pool boiling, calculating sinusoidal and square wave pressure variations effect on heat flux for comparison with measurements
Motion stability in periodic cubic force field, using nonliner differential equation integration with time periodic square wave function and Jacobian table