摘要:
Apparatus for controlling the direction of traffic flow wherein a plurality of rotationally mounted levers have a free end extending upwardly from the road surface. The levers are provided with removable spikes which rotate therewith to damage tires when the levers are rotated in one direction. The free end of each lever is provided with a rotationally mounted low friction contact member which contacts the adjacent surface of the tire and moves along the surface thereof. Envelopment of the free end of the lever by the tire and the coerced rotation thereof in the wrong direction do not occur. As a result, the failure of the corresponding spike to damage a tire when the vehicle is moving in the wrong direction is thereby avoided.
摘要:
A superconducting conductor assembly using high temperature materials. A double-walled tubular structure has at least one helical strip of superconductive material on the inner wall of the inside tube. Brittle, non-ductile superconducting materials may be used. A coolant, typically liquid nitrogen, is circulated between the tubes to maintain the superconductor below the critical temperature of the superconductor. A buffer layer is preferably included between tube wall and superconductor. A plurality of alternating layers of buffer and superconductor may be used.
摘要:
Metallic insulation for superconducting magnets to provide coil to coil and pancake insulation. Exemplary metal alloys and an anodization coating for such insulation are identified and may be selectively removed to provide shunt current paths. The coating for such insulation may be selectively removed to provide shunt current paths when the coil experiences a quench condition to preclude coil damage. Various applications of metallic insulation to superconducting coils are discussed.
摘要:
A non-contact measurement system for determining the contour of an electrically conductive surface relative to a fixed reference point comprising a support arm journaled at one end to a bearing providing a fixed reference point and adapted to extend toward a conductive surface having a contour to be determined and a non-contact probe coupled to the support arm by a precision lead screw driven by a stepper motor which moves the probe either toward or away from the surface and which generates an electrical signal indicative of its axial position from an initial reference position. Control circuitry coupled to the stepper motor is operable to direct the stepper motor to extend the probe toward the surface until it reaches a predetermined distance from the surface. The measurement process is repeated in a plurality of positions separate from the initial position to yield data indicative of the distance from the fixed reference point to the other position points and thereby create a data representative of the contour of the surface.An initial point may be provided separate from the conductive surface and the reference point may be placed in a plane to determine cylindrical and plane test surfaces.
摘要:
A four stroke cycle internal combustion engine is disclosed with means to provide auxillary pumping of air directly into the cylinder. The piston head is provided with a sliding valve which is self-acting for injecting air into the cylinder during the intake stroke, and to inject air into the cylinder during a portion of the expansion stroke. An air pumping chamber is formed between the lower portion of the piston and the cylinder carries a self-acting sliding valve which controls the flow of air into the pumping chamber.