Julian J. W. Wilson

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For planetary lander missions, the most challenging phase of the spacecraft-to-ground communications is during the entry, descent, and landing (EDL). As each 2003 Mars Exploration Rover (MER) enters the Martian atmosphere, it slows dramatically. The extreme acceleration and jerk cause extreme Doppler dynamics on the 8.4-GHz (X-band) signal received on(More)
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This paper presents very expensive impulse testing (also called surge testing) and turn insulation deterioration in electric motors. The tests include multiple start and stops under normal line conditions. The stresses introduced into the winding during startup and stopping process were two-fold. These stresses were the cause of the shorted turn-turn. The(More)
This article presents information on the safety, reliability, and environmental performance of natural ester transformer fluids by acquainting the readers with the history of transformer fluids and also explores how the industry has arrived at the current technologies of natural ester fluid. The properties of natural ester fluids are explained and then(More)
Between 1970 and 1990 the major advances in atmospheric chemistry were made in gas-phase photochem-istry, except perhaps for a brief intermezzo of " nuclear winter " studies. This focus is now shifting, as it is rec-ognised that natural and anthropogenic aerosols play a substantial role in the radiative properties of the atmosphere and Earth's climate. In(More)
During the development programme, it was determined that the Advanced Scatterometer Radar, now embarked on METOP-A could not meet its stringent radiometric requirements without regular, accurate, calibration. It was not believed that the stability requirements of 0.2dB or better could be met by natural sources such as rain forest or simple corner(More)