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A tracheal tube for use in intubating a trachea, and which embodies passageways and openings therein which are constituted and arranged in a manner particularly effective for the passage of suction… (More)
Fluctuations in the amplification and absorption of waves by quantum processes are considered. Assuming for each quantum the probability (per unit time) a of producing another quantum, probability b… (More)
The self-steepening, or change in shape, of light pulses due to propagation in a medium with an intensity-dependent index of refraction is investigated. The time required for the pulse to steepen… (More)
The extension of high quality astronomical observations towards larger apertures, adaptive optics, and infrared wavelengths leads to extrapolation of present knowledge of astronomical «seeing» by… (More)