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.
Ball bearing standoffs added to drafting instruments enable the instruments to be moved about, with their surfaces out of contact with the drawing paper. This provides a safeguard against smearing of the lines.
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.
Two-way cryogenic solenoid valve resists damage from vibration and metallic interfacial sliding. The new system features a flat-faced armature guided by a flexure disk which eliminates sliding surfaces and is less subject to contamination and wear.
Nonlinear DC circuits analyzed by digital computer for application to path integrals and stability problems
Minimum realization of linear time-varying nonanticipative system characterized by its impulse response matrix
Explore the source record for details and available documents.
Manganese, silicon, and magnesium markedly reduce the tendency of Inconel 718 to weld microfissuring. By combining a manganese, 0.20 percent by content, with silicon, greater than 0.25 percent content, or by adding 20 ppm of magnesium, the weld microfissuring decreased in the standard alloy.
Scalarization conditions and theorems extended to linear topological spaces
Time optimal control of linear systems with constraints on control amplitude and rate
Sample reduction method for quantization error analysis in analog-to-digital conversion of random time histories
Circuit lights neon lamp by back leakage current of the driving transistor, rather than by the transistors saturation or ''on-state'' current, thereby eliminating lowering of the voltage necessary for indication. Circuit has operating speed greater than indication circuit using a saturation principle and aids in power rationing.
Adaptive linear estimator for stationary time series, evaluating asymptotic mean square error bound
Perfect gas irrotational isentropic nozzle flow by solving partial differential equations set
High purity filter unit saves time and expense in laboratory operations and improves purity of liquids processed. Any but most viscous liquids are processed by modified unit equipped with appropriate filter medium. Unit's use eliminates much glassware cleaning tedium.
Regulator requires minimum amount of power for voltage division and it is not required continuously. The only power loss, except for regulating purposes, is that needed to provide for imbalances in load current requirements. For balanced loads, only leakage current flows through regulating transistors.
Noise reduction of Boeing 707 during landing approach by modifying turbofan nacelle with polyimide fiber glass acoustic sandwich materials
Static tests to determine effects of throat inlet concepts on forward-radiated fan noise of 707-320B/C airplanes
Subjective evaluation tests of ground observers on relative noise from acoustically treated engine nacelles of Boeing 707 aircraft