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Using external‐gain hydrogen‐maser oscillations were obtained at cavity Q values and beam intensities far below those required for a conventional hydrogen maser. Frequency‐pulling measurements and absolute frequency determinations of the hydrogen maser are reported. It is shown that the...
The dilatations (negative) caused by neutrons, 40–600 keV electrons, 140 keV H + , D + , He + , and gamma rays are given as a function of dose and are compared. The presaturation dependence is linear for neutrons, He + , and D + , and depends on the 0.5–0.7 power of dose for H + , electrons,...
Starting from the hypothesis of the modulation of energy of ions extracted by the high‐frequency voltage one calculates the width and the form of the energy spectrum of these ions. The variation of the energy deviation of the ions in function of the extraction voltage is obtained by applying to...
A broad‐area phototransistor is considered as an image intensifier for a beam of nonuniform radiation incident in an axial direction at the emitter surface. Gain is related to a reduction in the emitter potential barrier by the presence of excess carriers generated optically in and around the...
A comparison is made of microstructural changes leading to fatigue of copper and alpha‐brass at small strain amplitudes imposed at the normal test frequency of 1700 cpm and at the ultrasonic frequency of 17 000 Hz. A striking difference appears in the distribution of slip. At normal frequency...
A far‐infrared laser interferometer suitable for use with thin, transient plasmas of densities from 10 14 to greater than 10 17 cm −3 has been developed. A HCN gas laser operating at 337 and 128 μm and a H 2 O gas laser operating at 119, 79, and 48 μm are used as sources for a...
A model is formulated which predicts the characteristics of a short duration, intense microwave pulse propagating in initially heated, high‐temperature air. The temporal and spatial evolution of the electron temperature and density throughout the plasma are specified upon incorporating certain...
The adiabatic elastic constants of molybdenum and molybdenum alloyed in solid solution with 7.0, 16.6, and 26.9 at.% rhenium were measured in the temperature range −190°C to +100°C. Rhenium additions decrease ( c 11 − c 12 )∕2 and the twinning shear ( c 11 − c 12 + c 44 )∕3, and...
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