Abstract: A general solution to the problem of diffraction from a perfectly conducting sphere with a concentric shell spaced any distance from the surface of the sphere is presented. If the shell ...

Abstract: A four-shell head phantom has been built and characterized. Its structure is similar to that of nonhomogeneous concentric shell domains used by numerical solvers that better approximate ...

Beveridge and Denbigh 1 have directed attention to the development of a concentric shell of zinc oxide when a compressed sphere of zinc sulphide powder was oxidized in air at 1,250° C. This shell was ...

Is your feature request related to a problem? When I use Concentric Top/Bottom shells it starts printing outside moving inward. After a while it will retract, lift, and move deeper into the center of ...