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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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Vacuum dielectric capacitor is fabricated from materials with very low temperature coefficients of expansion. This precision capacitor in the 1000-2000 picofarad range has a near-zero temperature coefficient of capacitance, eliminates ion chamber action caused by air ionization in the dielectric, and minimizes electromagnetic field charging effects.
Standard surface grinder performs precision machining of thin-wall stainless steel tubing by electrical discharge grinding. A related adaptation, a traveling wire electrode fixture, is used for machining slots in thin-walled tubing.
Method provides precise alignment for metal-forming dies while permitting minimal thermal expansion without die warpage or cavity space restriction. The interfacing dowel bars and die side facings are arranged so the dies are restrained in one orthogonal angle and permitted to thermally expand in the opposite orthogonal angle.
Precision trimmer, which neatly trims biomedical specimen blocks for ultrathin sectioning, eliminates the risk of human error. Four inches in diameter and 3 inches in height, it supports the block and serves as a support for a cutting tool and can be adjusted in three dimensions.
Precision electromechanical power wrench applies a given amount of torque to a series of fasteners. It uses a commercially available dc permanent magnet torque motor with a current-controllable torque output and torque value indicator designed to the principles of human engineering.
Theoretical basis for double precision orbit determination program - formulation for computing two-way Doppler and round-trip range
Mass drop-off measurements, based on precise pressure and temperature measurements, evaluated for space vehicle gas leak detection
Precision flow measurement techniques for low thrust auxiliary propulsion liquid rockets
Precision power measurements of spacecraft CW SIGNAL level with microwave noise standards, noting Mariner IV application
Fuel consumption precision measurements for low thrust auxiliary rockets using impeller wheel and photometric devices
Prototype precision bolometer calibration bridge is manually balanced device for indicating dc bias and balance with either dc or ac power. An external galvanometer is used with the bridge for null indication, and the circuitry monitors voltage and current simultaneously without adapters in testing 100 and 200 ohm thin film bolometers.
Ammonium thiocyanate, added to the usual ferrous sulfate dosimeter solution, yielded a very stable, precise and temperature-independent system eight times as sensitive as the classical Fricke system in the 50 to 5000 rad range. The ceric dosimeters, promising for use in mixed radiation fields, respond nearly independently of LET.
Stepping drive has been designed for precise incremental angular positioning of scale models of spacecraft about a horizontal axis in order to accurately measure antenna receiving and transmitting characteristics. Positioning is insured by spring-loaded, self-locking plungers.
Multiple precision subroutine source programs for IBM 360
Analog computer simulation study of precise hybrid servo system to control experimental optical tracking mount
Feasibility study of high precision triaxial attitude control system for future spacecraft
Precision tilt and vibration isolation system design
Precision power measurements of spacecraft CW signal with microwave noise standards