Word: ammonias
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...link is proving to be a bonanza for U.S. firms; the Chinese import nearly 15 times as much from the U.S. as they export. Among the biggest ticket items to date are some 4,000,000 tons of grain, ten Boeing 707 jetliners valued at $150 million, and eight ammonia plants to be built by M.W. Kellogg Co. for $200 million. The Chinese are also anxious to do business with giant American oil companies such as Exxon, Mobil and Caltex, and makers of petroleum exploration and drilling equipment, including U.S. Steel International, Phillips Petroleum and Baker Oil Tools. Some analysts...
Comets, in fact, are nowhere near as large as planets. Their central structure, or nucleus, is usually no more than a few miles in diameter; it is believed to consist largely of frozen gases-mainly water vapor, methane, carbon dioxide and ammonia, and perhaps some hydrocarbons-and dust particles. That, at least, is the commonly accepted "dirty snowball" theory, originally proposed by Harvard's Whipple in 1950. But there are those who take exception to Whipple. British Astronomer Raymond A. Lyttleton prefers his own "gravel-bank" theory, which holds that the cometary nucleus is really a loose mass...
...nucleus). M.I.T.'s Haystack Radio Observatory will try a similar experiment in reverse: it will study radio waves from a far-off radio source (possibly a quasar) after they pass through the comet's tail, in hopes of finding the spectral "signatures" of water or ammonia. If they succeed, the M.I.T. astronomers will have gone a long way toward confirming Whipple's icy-snowball theory...
Whipple said that by viewing Kohoutek, he hopes to confirm his "dirty snowball" theory, which holds that the comet's nucleus is composed of dust particles imbedded in the ices of simple molecules of water, methane and ammonia...
...flaked the paint away, speck by speck. Veteran Restorer Dino Dini, 61, called in a chemist from the University of Florence named Enzo Ferroni, who discovered that the crystal growth was caused by lime, or calcium carbonate, turning into calcium sulphate. It took a year to find an ammonia solution that would turn the crystals back into calcium carbonate again. Impregnating a postcard-size sheet of Japanese rice paper with the solution and backing the paper with wood pulp, Dini and an assistant pressed each little rice-paper block for five minutes on the surface of the fresco, then repeated...