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Indium arsenide lasers have been used in measuring both risetimes and fall times as short as 60 nsec in impurity‐activated germanium detectors. The diffused lasers are pulse‐excited by an avalanche transistor circuit and emit narrow band infrared radiation at 3.175 μ when operated at liquid...
An apparatus is described in which a Sylphon bellows is used to generate pressures to 3400 atm or uniaxial forces to 1150 kg in the liquid helium temperature range without the use of mechanical compressors. Correction factors, operating procedures, and practical limitations of the design are...
Analytical expressions have been obtained to represent the field due to various types of steady current distributions in a torus. Of interest are some symmetric current distributions: uniform density surface and volume current distributions; and currents with density varying inversely as the...
An ion source for a mass spectrometer allowing the simultaneous introduction and measurement of sample and reference standard is described. It is useful for detection of very small differences in isotopic composition of elements. The residual background interference on the measurements is...
A device for reading ordinary Polaroid oscilloscope trace photographs has been assembled from an oscilloscope, an oscilloscope camera, a 400 channel analyzer, and some control circuitry. This device reads the coordinates of 400 points along a trace by scanning in the y direction until the trace...
Monopole mass spectrometer characteristics were determined by analyzing ion trajectories under various operating conditions. The trajectories were computed by numerical integration of the Mathieu equations of motion. The mode of operation was chosen to correspond with that in general use, with...
A variable speed motor and a step gear train have been combined to form a drive input to the speed control of an Instron tensile machine to produce a nearly constant true strain rate. The apparatus functions for both tension and compression over a wide range of strain rates.
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