Abstract: A polyphase electric power distribution system is protected from the effects of geomagnetic storms by countering the difference of potential between spaced grounding points in the system, and or by altering the magnetic circuits of transformers in the system to reduce half-cycle saturation and associated high peak currents.

Abstract: A polyphase electric power distribution system is protected from the effects of geomagnetic storms by countering the difference of potential between spaced grounding points in the system, and or by altering the magnetic circuits of transformers in the system to reduce half-cycle saturation and associated high peak currents.

Abstract: A head or body coil assembly for picking up signals in an MRI system is provided. It includes a thin band of conductive material which surrounds the specimen having a thickness comparable to the skin depth at the frequency of the spin echo signals of the MRI system but being transparent to gradient waveform frequencies. The thin band is in the form of a cylinder which acts as a flux tube for the RF signals to automatically provide for a homogeneous magnetic field.

Abstract: The operating efficiency of a Diesel engine is improved by method and means which prevaporize the injected fuel, and which establish initial combustion in a thermally-isolated, high-temperature chamber, and also which rely on various sources of heat in the operating engine to preheat the fuel to gaseous state prior to injection into the combustion chamber.

Abstract: An electron beam blanker for use in electron beam lithography systems is disclosed which is capable of providing exposure rates on the order of 300MHz at beam currents of approximately 600nA. A condensing lens and a stigmator are provided to bring the electron beam to a small image in a plane perpendicular to the beam direction. An etched silicon knife-edge, coated with gold, is located in this image plane in close proximity to the beam, to provide a sharp cut-off as the beam is swept past its edge. In accordance with aspects of the invention, a deflector plate structure provides an electromagnetic field whose geometry ensures that the velocity of a beam electron, as it exits the field, is substantially directly proportional to the undeflected beam electron's position vector relative to the beam cross-over in the image plane of the condenser lens.

Abstract: An X-Y recorder for high speed plotting on a plain web, i.e., a web without registration holes or other special means to maintain alignment of the web during plotting. Two embodiments of these plotters are disclosed with one degree of motion being achieved by moving the web and the second degree of motion being obtained by moving a pen assembly substantially perpendicularly to the movement of the web. To enhance the repeatability of the plotting on the web as it is moved back and forth, a random rough surfaced drive wheel assembly is included with that wheel surface making indentations along one surface of the driven edge of the web as it is first passed through the drive wheel assembly. Then as the web is reversed, these indentations substantially remesh with the random rough surface of the drive wheels.

Abstract: An array of curved metal strips is supported over an array of conductors, and a key is supported over each intersection of a metal strip and a conductor. When a user depresses a key, a metal strip is pressed against a conductor to make an electrical connection. As the metal strip is deflected by the key, it snaps or buckles, providing tactile feed back to the user. Each curved metal strip has a tine on one end for coupling the strip to a conductive member on a substrate that supports the strips and the array of condutors.