Engineering topics
Gray, D.
Publications and source records attributed to Gray, D..
Spacecraft navigation - cruisin' through space
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Cassini Maneuver Experience: Finishing Inner Cruise
The Cassini-Huygens spacecraft was launched in 1997.
Cassini Maneuver Experience: Launch and Early Cruise
The Cassini mission to Saturn was launched in 1997. It is an international effort to study the Saturnian system.
Fault-Tolerant Guidance Algorithms for Cassini's Saturn Orbit Insertion Burn
This paper describes a strategy that provides maxium assurance that Cassini's Saturn orbit insertion (SOI) will be successful.
The reaction of hydrogen peroxide with nitrogen dioxide and nitric oxide.
The reactions were studied with the aid of a mass spectrometer. A pinhole bleed system provided continuous sampling of the gas mixture in the cell during the reaction. It was found that the homogeneous reactions of nitric oxide and nitrogen dioxide with hydrogen peroxide are too slow to be of any significance in the upper atmosphere. However, the heterogeneous reactions may be important in the conversion of nitric oxide to nitrogen dioxide in the case of polluted urban atmospheres.
The reaction of H2O2 with NO2 and NO
The reactions of NO and NO2 with H2O2 have been examined at 25 C. Reaction mixtures were monitored by continuously bleeding through a pinhole into a monopole mass spectrometer. NO2 was also monitored by its optical absorption in the visible part of the spectrum. Reaction mixtures containing initially 1.5 - 2.5 torr of NO2 and 0.8 - 1.4 torr of H2O2 or 1 - 12 torr of NO and 0.5 - 1.5 torr of H2O2 were studied. The H2O2 - NO reaction was complex. There was an induction period followed by a marked acceleration in reactant removal. The final products of the reaction, NO2, probably H2O, and possibly HONO2 were produced mainly after all the H2O2 was removed. The HONO intermediate was shown to disproportionate to NO2 + NO + H2O in a relatively slow first order reaction. The acceleration in H2O2 removal after the NO - H2O2 reaction is started is caused by NO2 catalysis.