Abstract: An orbital angular momentum (OAM) controller controls OAM of a plurality of neutrons and includes: a substrate; a first surface of the substrate; and a second surface of the substrate disposed opposingly across the substrate from the first surface and including a contoured shape. A process for controlling OAM of neutrons includes: subjecting an OAM controller to a plurality of neutrons; receiving the neutrons at a first surface of the OAM controller; transmitting the neutrons through the OAM controller; and providing a phase shift ? to a wavefunction of neutrons transmitted through the OAM controller according to ??T1+T2(?/2?), wherein T1 is a first thickness of a substrate of the OAM controller, T2 is a second thickness of the substrate, and ? is an azimuthal angle of the substrate.

Abstract: A doorless, flexible shower stall for aircraft is shown, which shower stall is made of lightweight, 2-core-2 materials. The shower stall flexes as the aircraft flexes up to as much as five (5%) percent. The direction of discharge of water from the shower head is so the water will not be discharged out the doorless opening for the shower. Slopes of the floor is enough to overcome the angle of the aircraft during flight and still drain. The shower stall is composed of large pieces that are assembled and sealed when installed on the aircraft.