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The switching behavior of single‐crystal ferroelectric Bi 4 Ti 3 O 12 has been determined at room temperature. The switching time for fields from 4 to 14 kV∕cm can be expressed as t s = 1.32×10 −3 exp 61.6 (kV∕cm)∕ E μsec. For fields in the range 3 to 4 kV∕cm, partial switching...
Examination of chart tracings representing frictional force during the slip phase of the stick‐slip process, in fibers of two polymer types, revealed that these tracings do not have the sinusoidal character associated with a constant coefficient of kinetic friction. Considerations of the...
A method is presented here by which orientation distribution of crystallites in anisotropic polycrystalline samples can be derived from a set of plane‐normal distributions obtained by x‐ray diffraction measurements. It is the generalization of the similar procedure proposed previously for...
Fifty‐five ultraviolet laser transitions in the wavelength region 2300–4000 Å have been observed from the ions of N, O, Ne, Ar, Kr, and Xe. The electron transition is p → s for all identified lines, with the exception of two xenon transitions which are p → d . Threshold currents for...
A new method is described of measuring discharge propagation velocities in Geiger‐Müller tubes utilizing the visible radiation emitted by the discharge. Propagation velocity data for argon are given as a function of pressure, overvoltage, and percentage of ethanol quenching agent. The results...
A method is described for determining the melting point of a material by partially melting a long single crystal in a temperature gradient. The melting point of barium telluride was found to be 2070°±10°C. Single crystals of barium telluride were grown in graphite crucibles using a...
Studies of energy exchange from Nd to Yb in calibo glass were made using the technique of time‐resolved spectroscopy. The rate of energy exchange between the systems was of the order of 3×10 4 ∕sec, while the quantum efficiency for the process was estimated at 0.6. The mechanism is...
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