Laser studies carried out at the University of Illinois in 1966 showed that the shortest wavelength at which lasing could be achieved in GaAsP was dependent on the n-type dopant. In particular sulfur doping was found to restrict lasing to long wavelengths. It was suggested that this could be due to the effect of energy levels associated with the higher conduction band minima. This led in 1967 to an investigation ...
In order to establish the performance of the equipment before proceeding with new research, tests were made with a propeller previously tested at the David Taylor Model Basin; the results are reported.
A solution is given for the problem of finding a transition or switching curve in the phase plane for the expression mx + cx + kx = Df(x,x) so that solutions reach the zero state in a minimum time. The solution has applications in the design of servomechanisms and similar systems; f is a discontinuous function which assumes only + of - 1. The solution required the problem to be ...
It is shown that the induced drag of a hydrofoil of aspect rati o = or > 6 (the smallest investigated) can be computed with sufficient accuracy by a procedure similar to that used for airfoils in an infinite medium. The serveral methods for computing the wave-making drag of hydrofoil in mediums of finite or infinite depth are compared. An empirical correction factor depending on the ratio or velocity to ...
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