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A procedure is presented for finding by successive approximation the current distribution, and thus the electromagnetic field, of the lowest mode of the microstrip transmission line. The approximation is valid provided that the strip is not too wide and the dielectric sheet not too thick. Each...
Electroluminescence intensity of phosphor layers decreases with running time; this decay can be described by the empirical expression, proposed by Roberts, L=L 0 ∕(1+ t∕t ☒ ), where t ☒ is the time to half‐intensity. It is also observed that, during electroluminescence decay at room...
The design and performance of equipment to measure film toughness under impact loading is described. The measured quantity is the amount of energy absorbed by a film when a ball is projected through it. The velocity of the ball can be varied from about 20 ft∕sec to 800 ft∕sec. A conditioning...
A dislocation climb creep model is considered which does not require the production of immobile dislocations. The creep equation that results from the analysis is creeprate = A σ 3 sinh ( B σ 1.5 ∕ k T ) exp ( − Q ∕ k T ) ,where A and B are constants, σ is the stress, Q is the activation...
Oxides having the magnetoplumbite structure and a wide range of magnetic properties have been examined. The magnetic saturations of the compositions M II Fe 12 O 19 can be lowered by replacing part of the iron with the ions Al 3+ , Ga 3+ , Mn 3+ , Cr 3+ , and Ge 3+ amongst others. M II in the...
When a glass capillary tube filled with alternating drops of mercury and electrolyte is made to vibrate mechanically, an alternating voltage is available across terminals inserted in its ends. This effect has been attributed to changes in the surface area of the interfaces E. Yeager and F....
A method is presented for estimating the nonlinear noise contribution in an oscillator at low levels of oscillation. This involves obtaining an approximate solution of a nonhomogeneous van der Pol type of nonlinear differential equation driven by noise. The method of solution is based upon the...
A rigorous formulation of Babinet's Principle has been found by Copson and by Meixner for perfect conductors. A recently published theory of diffraction by holes in absorbing and transparent screens suggests a generalization of Babinet's Principle to absorbing and transparent materials. The...
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