The translation vectors of the convenient unit cell, e.g. the cube edges of the fcc structure (which is not primitive) are used for the coordinate axes. The plane shown intercepts at 3, 2, 2 on the axes. As, by definition, these three points are not co-linear, therefore they can adequately define the plane. As we shall see later, the reciprocal of these numbers are more useful. First, reciproca...

This article summarizes a study of classroom television use. It describes the study methodology as "eclectic, drawing on traditions of action research ... ethnography ... history ... and constructivism..." (Ellipses in quote represent omitted citations.) The article is not particularly well organized. The author quotes extensively from the findings of earlier research studies, but does not alwa...

The phenomenon of irregular frequencies or spurious modes in boundary element techniques for acoustic problems has been well investigated and a number of methods have been presented to overcome this problem. The most popular methods seem to be the Combined Helmholtz Integral Equation Formulation (CHIEF) and the Burton and Miller formulation. This contribution deals with the latter and its only ...