Abstract:
A linear motor compressor including a compressor housing and a cylinder housing having a plurality of opposing compression chambers. A piston freely reciprocates within the cylinder housing using a linear electric motor. A piston position feedback control system provides adaptive current output as a function of position feedback and/or velocity feedback from the piston and/or the electric motor, to directly power and control the electric motor, wherein the piston reciprocates without assistance from a mechanical spring or other equivalent centering force.
Abstract:
Major word processing software should have a Plus version with the full range of function, but also a Basic version for most users, who do not need all the possibilities in the most sophisticated programs.
Abstract:
Instead of calculating pi, perhaps software can be developed in which a square becomes a circle, yielding a precise circumference and clues to new formulae, perhaps using different numeric systems.
Abstract:
A Larger Capacity Preloaded IPod or other MP3 Player—up to 16 GB currently—can be made to sell large collections of a particular musical artist, genre, or era and to get around Internet accessibility problems.
Abstract:
A radar or other microwave antenna comprises at least one antenna element, a feed structure for the element extending to the antenna element substantially normally thereto through a dielectric substrate, and characterized in that the dielectric substrate is anisotropic whereby to reduce unwanted common-mode currents in the feed structure. The anisotropy may be provided by elongate conductive elements distributed through the dielectric substrate and aligned with their longitudinal axes parallel to the feed structure.