Abstract: An oral appliance for users of continuous positive airway pressure (CPAP) machines. CPAP users who use a nose-only mask experience a flow of pressurized air out the mouth if the mouth is open. This causes the mouth to dry out and allows the return of obstructive sleep apnea. The oral appliance forms a seal in the user's mouth that prevents the flow of air out of the mouth, which restores full function to the CPAP machine.

Abstract: An integrated solar concentrator and tracker is constructed from a beam deflector for unpolarized light in combination with a fixed optical condenser. The one-dimensional beam deflector consists of a pair of prism arrays made from a material whose refractive index can be varied by applying an electric field. Two of the one-dimensional concentrators can be arranged with their faces in contact and with their prism arrays perpendicular to construct a two-dimensional beam deflector. The intensity and distribution of an applied field modifies the refractive index of the individual prisms in order to keep direction of the deflected beam fixed as the incident beam shifts. When the beam deflector is used with the fixed concentrator the result is that the position of the focus remains fixed as the source moves.