Trapezoidal Line Research Articles

Boundary element analysis of a trapezoidal transmission line

A transmission line with a trapezoidal cross section is analyzed using the boundary-element method (BEM) and the quasi-static approximation. By utilizing a convenient choice for the fundamental solution, the efficiency of the method is clearly established. The analysis is verified by comparisons with results in the literature and measured data.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

NOTES ON COSMIA ORINA, Guenee

Mr. Wm Saunders has sent me, under the number 115, specimens of a Noctuid “from larvæ found in oak, imago July 19th,” which I regard as this species. The moth is variable in general colour and the appearance of the discal spots, and hence Guenée's description wi1l not always literally apply. The only difference of importance I can see is that the two median trapezoidal lines on the fore wings are wider apart on the internal margin than in my specimens of the European trapezina.