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Recently developed high output beryllium window x‐ray tubes are very useful for work in radiation chemistry but dosage determinations are difficult because of the high output and the rapid absorption of the soft radiation.;
The Pennsylvania State College played host for the thirty‐ninth meeting of the Acoustical Society of America last June 22, 23, and 24. Sessions covering a wide variety of subjects (including such matters as noise, hearing, speech, transducers and recording, the medical and biological effects of...
High peaks are all around; covered with the everlasting snow that defies the heat of the summer. The Mont Blanc, far away to the west, extends in a long jagged line and looks almost slender in the distance. Close by, to the north, stands the Matterhorn, a massive tower, a huge chunk of rock,...
The variation of the neutron flux with time in a nuclear chain reactor is determined to a large extent by the delayed emission of a small fraction of the neutrons formed in fission.
The Institute has received with much regret the resignation of David A. Katcher as editor of Physics Today .
Standards of physical measurement, a scattered assortment of artificially defined constants that has been a familiar source of commercial and conversational frustration, were in their beginnings invented for reasons of local convenience and have had essentially only one other thing in common:...
The most important determiner of the state of human visual sensitivity is the level of illumination to which the eye has been exposed.
Many useful engineering formulas in room acoustics can be obtained from the methods of “geometrical” acoustics which assume that sound travels as rays in a manner somewhat similar to that of light.;
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