Word: heat
(lookup in dictionary)
(lookup stats)
Dates: during 1950-1959
Sort By: most recent first
(reverse)
...French Dominican priest who has spent the last 24 of his 53 years in Palestine. Archaeologist de Vaux supervises the publication of the fragments, leads the periodic expeditions to the Qumran ruins. (Features of a typically rugged day there: Mass at 5:30 a.m., digging in the merciless heat until 3 p.m., paper work amid clouds of mosquitoes until midnight.) De Vaux's fellow priest, Polish-born Father Joseph Milik, 35, who left Warsaw when the Communists took over, is known as the Scrollery's fastest man with a fragment. Chicago's Frank Cross, a Presbyterian, spent...
...Heat Balance. To make observations beyond the earth's atmosphere, the instruments in a satellite must be kept fairly cool. The job is harder than it sounds. Space is neither hot nor cold, but an object exposed to sunlight in space may get pretty hot. The temperature that it reaches will depend on how its surface absorbs and emits radiation. If the energy that it absorbs from sunlight is greater than the energy that it emits as heat rays, the body's temperature will rise. The amount of heat rays that it emits will rise too. Eventually...
...radiation penetrates to the shiny aluminum and is mostly reflected back into space. The temperature of the aluminum rises slowly, both because it is a poor absorber and because the silicon monoxide layer in contact with it is a comparatively good radiator of infra-red (heat) rays. By experimenting with different thicknesses of silicon monoxide, the Navy's scientists think they can keep the temperature of the skin below 140° F. The sensitive instruments inside will be comfortable at about 120° F. When the satellite passes into the shadow of the earth, its temperature will drop suddenly...
...helpless on a highway as a bat or a hummingbird. Even the workaday turboprop (a gas turbine that delivers power through a shaft, not through a jet of gas) is hard to adapt to ground uses. Chief failings: 1) poor fuel economy, especially at low speed. 2) cost of heat-resistant parts, 3) sluggish response when power is called...
...each horizontal cylinder or "gasifier" (there may be any number of them feeding the same turbine) are two pistons that slide back and forth. When they move together in the center, they compress a charge of air and heat it so hot that fuel sprayed into it burns immediately, as it does in a conventional diesel engine. The explosion heats the air still hotter, raises the pressure and forces the pistons apart. As they move away from each other, they do three things: 1) the large disks on their outer end draw fresh air from the atmosphere into chambers behind...