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Summary form only given. We have developed and demonstrated a prototype for an intelligent plasma antenna. The object is to have an antenna observe a designated transmitter, while disregarding unwanted signals coming in from other azimuth angles. In this way, both unwanted background noise and multi-path reception clutter are reduced. The advantage of a plasma antenna over a scanning mechanical antenna...
Summary form only given. The paper investigates the efficacy of the atmospheric pressure plasma discharge apparatus in sterilization of spores. The plasma sterilizer was tested on a highly resistant spore producing bacterial strain Geobacillus stearothermophilitis. This particular strain is commonly used in biological indicator strips used to monitor autoclaves and steam sterilizers. The experimental...
Summary form only given. Plasma barriers are used to protect sensitive microwave apparatus from potentially damaging electronic warfare signals. Unfortunately, the characteristic decay time of the plasma after power turn-of is typically many milliseconds, so the opening time of such a barrier generally is predicted also to be many milliseconds. However, we have found both experimentally and theoretically...
Summary form only given. We have been designing a plasma shield intended to protect sensitive microwave equipment from intense electronic warfare signals. A layer of plasma tubes is used as a microwave reflector. The plasma tubes work extremely well in intercepting microwave radiation when the incident wave electric field is parallel to the tubes. However, if the electric field is perpendicular to...
Summary form only given. Considerable progress has been made on plasma antennas of which the major advances are: operation at higher plasma densities in the steady state, considerable reduction of power consumption and reduction of noise from the electrical current, which generates the plasma. We have performed experiments concerning transmission and reception, stealth, reconfigurability, shielding,...
Summary form only given. We have made the following advances for our DC, steady state atmospheric pressure plasma discharge in air. We have measured the free electron concentration in our discharge by converting the 1/2 cm. gap, parallel-plate discharge into a parallel-plate transmission line. The frequency used was 6 GHz, corresponding to a free-space wavelength of 15 cm. The path length for the...
Summary form only given. In the following up of our initial work on ball lightning, we have developed a special camera for photographing the initial stroke of a lightning discharge. The object is to obtain time resolved photographs of the closed current loops observed in sparkovers in the Holifield 25 MV, DC accelerator at the Oak Ridge National Laboratory. The apparatus comprises a commercial lightning...
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