The military retirement system provides an immediate, lifetime, inflation-protected annuity to personnel who co mplete 20 or more years of service. The cost of this system has risen substantially in the past 15 years, and the system's actuarial costs now comprise almost one-third of total military manpower costs. Because of its importance in the total military compensation system, the military retirement system exerts a significant influence on the age structure of the force and on personnel turnover patterns. This article evaluates the relative efficiency of the current retirement system by comparing it with two recently proposed alternatives, one by a presidential commission and one by the Department of Defense. It estimates the impact of these proposed alternatives on the military personnel force structure and on manpower costs. It is concluded that these alternatives would provide a force as capable as today's force at significantly lower cost.
An axially extracted virtual cathode oscillator driven by a 4 MV, 80 kA elecron beam has been used to generate microwave pulses with an average peak power of 7.5 GW at a frequency of 1.17 GHz. Peak power efficiency was 5.3% and energy efficiency was 2.3%.
Results from two 4 MV, 100 kA coaxial magnetically insulated transmission line virtual cathode oscillator experiments are presented. In both experiments, two distinct microwave pulses with vastly different frequencies were generated during the beam current pulse. The first, lower frequency pulse was found to be produced by an electron reflexing process, while the second, higher frequency pulse was due to the virtual cathode oscillation mechanism.
A theoretical study of the sound power density field radiated from a simple source, a doublet source, a single point source before a totally reflecting plane (free as well as rigid), and a piston vibrating in an infinite fixed wall have been investigated. Formulae are worked out to allow the computation of percent of total radiation flowing through a given area. By interpolation of the graphs plotted from these equations, the streaming or flow of energy for the above radiation fields is shown. In connection with this work the numerical integration of the definite integral ∫z′Pm(z)Pn(z)dz, in which the P's are the Legendre polynomials, was carried out for all the even values of m and n from 0 to 20, and for the argument z taking thirteen different values in the interval 0⩽z⩽1. In case these computations are not published, they are available from the authors upon request.
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