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Electromagnetic waves can be severely attenuated and suffer distortion as they propagate through partially ionized gases. These facts must be considered in the design of any communication system in which waves must propagate through an intervening plasma medium, such as in reentry communications and ionospheric propagation. In this report, formulas are given that can predict such wave attenuation characteristics more accurately and for a much wider range of plasma conditions than previous theories. The conventional Appleton-Hartree equation used in ionospheric propagation studies gives the index of refraction of a wave traveling through a plasma in a magnetic field in terms of the properties...
We all possess snapshots in time in our hearts and minds-images and memories that draw us back to our childhoods. In this collection of poetry and short stories, author David L. Dougherty combines whimsical make-believe with some truths about childhood experiences both tragic and lighthearted. Dougherty recalls looking through the shard of glass from the kitchen door of his boyhood home. He shares a boy's love for adventure and a mature man's appreciation of nature's beauty. He also explores the heartfelt connection that he made while walking the sod of Ireland, the land of his ancestors, and standing at the O'Dougherty castle bridge in Buncrana, Ireland. Combining whimsy and nostalgia, My Shard of Glass offers an exploration in verse of nature, childhood, and times gone by. Wish Two young boys, sitting on the bank, watching the big rigs run. One said, "I wish we were old enough for that kind of fun." The driver saw the boys waving, and with a grin, said to his partner, "I wish we were on that bank again."