at temperatures below freezing,causes only a small percentage of airport shutdowns.Cold fog is fairly easy to eliminate.For quite a few years,airports have used cloud-seeding methods to dissipate cold fog.An airplane drops crystals of dry ice into the fog.Soon,snow falls and the air clears....
with improved performance, which opened up the era of man-made piezoelectric materials for underwater acoustic transducers. World War II and the following Cold War greatly promoted research for better transduction materials to further improve the acoustic transducer performance. Ammonium...
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