Aerospace & Aviation

Nonthermal charged particle excitation of aurora and airglow, examining precipitation and acceleration mechanisms

Arcing between the electrodes of an ion rocket thrustor is investigated for the effect it will have on the overall design of ion rocket systems. The effect of generator, transformer, and inserted impedances on system stability and efficiency, and on operating lifetime of thrustor components are considered. Rate of arcing, preferential arc paths, speed of arc interruption, and response of thrustors to voltage transients are also discussed. The study indicates that arcing is a system hazard and that arcing rates are of prime importance in the design and development of thrustors, thrustor arrays, and system components. Two system models for reducing the hazard are proposed, based on principles developed herein, published data, and experience available from operation of nine-module electron-bombardment thrustor array. Experimental investigation of these models is presently underway.

Visible absorption bands of alkali metals in molten alkali chlorides

Looking ahead mechanisms to characterize human operators sensing and using future imput data in forced pace control tasks

Ultraviolet irradiation induced catalytic activity of magnesium oxide for hydrogen-deuterium reaction using electron paramagnetic resonance spectrometer

Central and outer emission knot velocity fields, rotation and mass of barred spiral galaxy ngc 613

Symposium on physicochemical diagnostics of plasmas, aiaa and northwestern university at evanston, illinois in august 1963

Chondritic meteorites analyzed with electron microprobe to determine metal content

Turning point peculiarities in near-resonant response of slightly tapered rectangular membrane strips

X-ray diffraction of ammonium tricyanomethide and pyridinium dicyanomethylide shows nonplanar carbanion structure

Complex systems improvement by integration of reliability and systems engineering techniques

Design for accelerometer providing discrete output signal for data processing applications

Educational programs to train space scientists and engineers

N, k group codes without repeated columns obtained by puncturing coordinates of length shift register code

Fokker-planck equation for test particle distribution of equilibrium plasma