SEARCH · Search NASA
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Abnormally large variation of capacitance with temperature is obtained in thin film capacitors when a fixed ionic space charge is present in sufficient density in a dielectric film. This effect is the basis for a new kind of thin film thermal detector, whose performance at room temperature equals or exceeds that of comparable devices at much lower temperatures.
Computer based data conditioning and display technique detects incipient failure in servo system testing, for use in prelaunch checkout of complex nonlinear servomechanisms. These phase plane displays enable identification of, on line, unusual or abnormal servo responses which can be displayed compactly in the time domain on a cathode ray tube.
Automatic malfunction analysis /AMA/ technique providing space-vehicle test engineer with listing of all component failures that could cause abnormal indication at any observable monitoring point
Abnormal low helium abundance in atmospheres of old halo B star based on weak absorption lines in helium spectra
Abnormal metallic line densities in peculiar A and B stars using spectroscopy, energy distributions, etc
Liquid Pu alloys viscosity measurement from fluid flow behavior in oscillating cup viscosimeter, discussing abnormalities related to oscillation period and temperature
Skeletal atrophy in astronauts due to space flight weightlessness, noting abnormal Ca losses and reduced bone density
Metal-nonmetal transition in n- and p-type Si from high magnetic field galvanometric measurements, noting abnormally large magnetoresistance accompanied by Hall coefficient increase
Application of the microhm measuring circuit to measurement of plated-through hole resistances, when combined with appropriate probes, provides data that can be related to the quality of copper plating on printed wiring boards. Acceptance limits can be established and continuous inspection performed, with plating defects causing abnormal readings.
X irradiation and temperature effects on flour beetle /Tribolium confusum/ pupae, noting wing abnormalities and pupal stage duration
High strength magnetic fields effect on early embryonic development of frogs, relating growth abnormalities and paramagnetic ferritin motions
Altered gravitational field effects on frog eggs centrifuged under various conditions after fertilization, noting time dependence of induced abnormalities
Herculis 89 supergiant abnormal IR radiation flux originating in circumstellar shell of solid particles radiating at observed long wavelengths
Method and photodetector device for locating abnormal voids in low density materials
Computer editing routine for data abnormalities in multivariate statistical analysis
High voltage power supply for NASA orbital gravity substitute electrostatic workbench, including abnormal load and oxygen environment tests
Unlit lunar limb observations at IR wavelengths, presenting temperature charts and thermal abnormalities
The sixth Atlas Centaur vehicle (AC-6) was successfully launched from the Eastern T e s t Range, Complex 36B, on August 11, 1965, at 0931:04.430 EST. A 2084-pound dynamic model of the Surveyor payload was placed in a simulated lunar transfer trajectory. Vehicle systems operated satisfactorily and all the flight objectives were accomplished. Lift-off within 4 seconds of the window opening demonstrated the launch-on-time capability of the vehicle were accurately compensated for by the Centaur guidance system. the Surveyor model into a near-perfect lunar transfer trajectory would have resulted in an impact of the moon without a midcourse correction. To hit the precise target area on the lunar surface, the required correction would have been 4.25 meters per second, which is well within the spacecraft capability. Normal thrust and impulse levels were obtained with both the A t l a s and Centaur propulsion systems. However, a sizeable thrust overshoot on startup of the Centaur engines has not been resolved. A propellant-utilization system used for the first time on the Centaur, accurately controlled the fuel and oxidant consumption. The turnaround and retrothrust maneuver were performed without incident. Relatively high longitudinal modal excitations and lateral payload excitations were obtained at lift-off; these high perturbations are believed t o be related t o the launcher holddown arms. Nominal temperatures were recorded for both the external vehicle skin and the payload compartment; however, abnormally low temperatures were measured in the forward equipment area, which may have resulted from leakage of cold helium purge gas. All vehicle electrical systems performed satisfactorily; the only difficulty with the RF systems was obtained with the C-band transponder. of the vehicle instrumentation yielded valid data. The AC-6 vehicle was constructed with several new lightweight designs including the forward bulkhead, thrust barrel, interstage adapter and tank skin thickness reduction from 0.016 t o 0.014 inch. No deficiencies were observed in any of these new structural elements.