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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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A new rule for finding breakaway points of root loci involving complex roots.
Breakaway points of root loci involving complex roots found via real root system
Alternation of rules in children's grammar
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Development of a supersonic area rule and an application to the design of a wing-body combination having high lift-to-drag ratios
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Some considerations regarding the application of the supersonic area rule to the design of airplane fuselages
Supersonic aircraft fuselage design for minimum wave drag
Spectral density sum rules, current algebra, and zero-mass extrapolations.
Partially conserved axial vector currents and current algebra to obtain vertex functions at point having zero mass by extrapolations
Nuclear abundance rules and the composition of meteorites.
Meteorite and primordial matter composition related to possible fractionation processes influence, discussing nuclear species abundance
Large diffraction gratings ruled on a commercial measuring machine controlled interferometrically
Large diffraction gratings by interferometrically controlled commercial measuring machine
An extension of Frost's mixture rule to include the effects of multiple ionization on electrical conductivity - Application to equilibrium air at 3000 to 28,000 K
Expressions for electrical conductivity of plasmas applied to equilibrium air at 3000 to 28,000 K
The accuracy of the Landau-Whitham shock strength rule in some near field situations
Accuracy of shock pressure attenuation in near field sonic boom profiles
Group theoretical selection rules for electron-impact spectroscopy.
Simple group theoretical principles are applied to the consideration of electron scattering off atoms and diatomic and polyatomic molecules. This approach is also used to estimate relative strengths of electron-impact-induced transitions of diatomic and polyatomic molecules.
Active controls - Changing the rules of structural design.
Approaches making use of aerodynamic surfaces in combination with advanced flight computers, and electrohydraulic systems could be used to improve economics of commercial aircraft operation, smooth the passenger's ride, reduce terminal-area noise, and ease terminal-area congestion. This emerging technology is becoming known as active controls technology. Maximum benefits from active controls can come only by considering controls early in the design cycle. Active controls can save weight by reducing the structural strength necessary. Some of the technical benefits of active controls would increase return on investment and raise profits. Details of a proposed active controls research program are discussed.
Conservation laws and preferred frames in relativistic gravity. I Preferred-frame theories and an extended PPN formalism. II - Experimental evidence to rule out preferred-frame theories of gravity.
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A comparison of the efficiency and focused stray light characteristics of a conventionally ruled- and a holographically produced-concave diffraction grating in the vacuum ultraviolet.
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Generalized current distribution rule
Method helps determine branch current in parallel-series network in relation to total input current by inspection. Method is particularly useful for circuits with many elements when branch elements are described as admittances. If element values are variables, then these values may be expressed as admittances to find currents readily in desired branches.
Application and limitations of the area rule
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Several extensions of the area rule
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External-store drag reduction at transonic and low supersonic Mach numbers by application of Baldwin's moment-of-area rule
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