Abstract: A complementary GaAs Transistor pair is formed of a p-type MODFET and an n-type FET having an ion-implanted channel doping with a heterojunction gate. One set of structures is implemented in a planar process utilizing molecular beam epitaxy. The p-MODFET threshold voltage is determined by the thickness and doping of the p-AlGaAs layer plus the Schottky barrier height of the metal gate, and the ion implantation dosage is adjusted to give the proper threshold voltage for the enhancement mode n-channel heterojunction FET.

Abstract: Spring-loaded linkage contained in a housing attached to the control stick of an aircraft. One member of the linkage is an arm having an end projecting from the housing and forming a hand grip through which the pilot controls the aircraft. The linkage provides a resisting force on the arm which prevents it from rotating relative to the control stick during normal flight maneuvers. However, when the control stick is pulled to full aft stop and additional pull equal to the spring break-out force is applied, the resisting force suddenly decreases, and the arm and grip rotate aft a discrete displacement relative to the control stick. This displacement actuates a g-limiter override which permits the aircraft to exceed set limits on its normal acceleration. The discrete displacement also provides the pilot with a tactile signal that the override has been actuated. The g-limiter override condition can be maintained by a pull on the grip substantially less than the spring break-out force.

Abstract: An apparatus and method for controlling the superplastic forming process by measuring and controlling the volume displaced by the blank being formed so as to measure total strain or surface area increase of the blank.

Abstract: A hydraulic power actuator system flow augmentation scheme of the boot-strap type. The scheme consists of a jet pump to augment pump inlet flow with return flow by reducing the pressure in the jet pump below return pressure. A check valve is installed in the augmentation circuit to prevent back-flow during low flow rate conditions. Two load recovery check valves are used to short circuit the actuator during aiding load conditions.

Abstract: An inexpensive method of forming close tolerance holes in composites utilizing the B-stage characteristics of those composites. The holes are formed by assembling the composite structure, B-staging the composite material, cutting or drilling undersized holes in the B-staged material, inserting appropriate male forming pins, dies or mandrels in the holes, completing the curing of the composite structure with pins in place and then removing the pins to leave high quality, close tolerance holes in the composite structure.

Abstract: An explosively operated, confined linear explosive separation joint. The joint features a one-piece female member of a clevis type shape with shear lip grooves located on the outside surface of the clevis generally aligned with the fillet formed between the sidewall and the bottom of the opening in the clevis. The explosive means is contained in the bottom of the clevis portion with the male portion of the joint slideably nested in the clevis opening abutting the explosive. Shear lip groove alignment with the corner radius or fillet formed at the bottom of the clevis and the stiffer structure adjacent to the break point combine to ensure optimum use of the explosive energy and produce a joint which fails primarily in shear rather than tension, taking advantage of the materials weakest property.

Abstract: Ultra low-power GaAs complementary junction field effect transistors are implemented in the design of complementary integrated circuits using a planar technology in conjunction with multiple and selective ion implantation. Both junction FETs, namely the p and n channel devices, are enhancement mode devices and biased in the forward direction thus leading to the advantageous DCFL (directly coupled field effect transistor logic) with one power supply, low power dissipation and high packing densities, all prerequisites for VLSI (very large scale integration).

Abstract: The demodulator system includes a source of light, and a beamsplitter which produces mutually coherent sensor and reference beams through sensor and reference fibers respectively, the sensor fiber being exposed to the effect to be sensed while the reference fiber is isolated therefrom. A ferrule maintains the output ends of the sensor and reference fibers in fixed positions with respect to a combiner lens which collimates the sensor and reference beams to form an interference pattern on a quad detector through a quad grating. The quad grating has four quadrants lined with the spacing of the interference pattern produced by mixing of the sensor and reference beams but positioned 0.degree., +90.degree., -90.degree., and 180.degree. apart in phase, .phi.. Therefore the quad detector produces outputs which contain +sine .phi., -sine .phi., +cosine .phi., and -cosine .phi.

Abstract: A solar dish concentrator is provided having a rotationally symmetrical elliptical shape for focusing an uniform flux density of solar radiation on a receiver. The solar flux pattern reflected to the receiver is evenly distributed over the four quadrants of the receiver without containing any hot spots.

Abstract: A radiation dispersing cavity has its interior surface covered by a plurality of deformations, each of which acts as a dispersing element which is small with respect to the effective diameter of the cavity and yet large with respect to the wavelengths processed by the integrating cavity. The interior surface of the cavity is coated with a material which provides the proper reflectivity for the wavelengths of interest. The interior of the cavity is covered with at least two different sets of interlocking deformations producing at least two different apparent planes of reflection. Use of alternating concave-inward, concave-outward deformations facilitates smooth transitions between deformations, preventing development of hot spots at sharp discontinuities.

Abstract: Use of a special blue or blue-green optical filter in a single or double layer dichroic liquid crystal display which is back lit by dimmable incandescent lights provides for easily read, high contrast presentation of information.

Abstract: This read next instruction system (RNI) fetches and parses multi-byte instruction streams by means of a picoprocessor subsystem in conjunction with a state machine controller. These controllers cause the input data, which constitutes software instructions, to be parsed into a plurality of first rank instruction registers. Upon reception of an appropriate command from the main CPU system, the information contained in the first rank registers is transferred into second rank instruction registers. Then the RNI system continues to parse more data which replaces the transferred data in the first rank instruction registers. The data in the second rank instruction registers is used directly by the main CPU for the following functions: map branching and conditional branching based on OP codes and sub OP codes; address computation based on address register and displacement information; use of literals for test masks and software branch address; and determination of word length.

Abstract: Ordinary digital data is reformed and time shifted such that it may be broadcast over a radio link which periodically shifts its frequency. The system of this invention utilizes timing information obtained from a pre-existing frequency-hopping radio link in conjunction with its own buffer and control circuitry to accurately time-position discrete digital data packets within those time bands of the radio transmission wherein the frequency is not changing from one frequency to another. In the drawing, T.sub.H1 is a very short duration pulse which commands the AM frequency--hopping system to shift frequencies. The time period necessary for the frequency hop operation to settle down and attain a stable frequency is represented by the interval between T.sub.H1 and T.sub.1. The actual reception of the uplink message occurs in the interval between T.sub.3 and T.sub.4 ; transmission of the downlink signal from the system occurs in the interval between T.sub.5 and T.sub.6. The interval between T.sub.4 and T.sub.

Abstract: An element is soldered to a heat sink by a flux-free technique in which flux-free solder is first deposited onto the heat sink surface, then the element is placed into position on the surface, then the heat sink is placed into and held at a constant temperature in a pressure controlled chamber to a level below the melting point of the solder while undergoing a plurality of cycles of introduction and purging of an oxygen stripping gas.

Abstract: There is provided by this invention an automated machine tool having a rotary indexing table that allows the machine tool to precisely rotate a workpiece 360.degree. to perform a machining function. The rotary indexing table has an aperture therein designed to accommodate an indexing tool supported in a rotatable spindle such that with appropriate movements of the moveable worktable the indexing tool causes rotation of the rotary indexing table to a precise position.

Abstract: There is provided by this invention an automated machine tool having a workpiece transfer apparatus that allows the machine tool to automatically load and unload a workpiece during machining. The automated machine tool has the capacity to select a workpiece from a stack of raw material, transfer the workpiece to a machining station, and select a new workpiece from the stack of raw material without human intervention.

Abstract: A passive device which allows processing of signals impressed upon a light beam and arranged so that sensitivity is maximized and signal dropout, due to environmental effects such as temperature, do not occur. The passive homodyne demodulator includes a beam combiner, for combining the impressed light beam with a reference beam, beamsplitters, polarizing beamsplitters, and birefringent elements used as polarization shifters, so that ouputs are produced which are the sine and cosine of the phase change between the sensor and reference beams due to changes in the effective optical path length difference of the reference and sensor fibers due to the effect sensed. These signals are then electronically converted into an electrical output which linearly represents the phase of the signal originally impressed on the sensor fiber.

Abstract: A wheel lift for lifting multi-wheeled vehicles. A wheel lift is applied at each wheel and has a generally U-shaped base supported by an air bearing under each arm. A pair of adjustable chocks engage the wheel near the floor. Either a hook engages the wheel generally opposite the chocks or for application of the device on the inboard side of the wheel, a support member picks up the vehicle structure to resist any overturning moment and provide stability.

Abstract: An improved compact optical gyro is provided wherein a beam of light is split and introduced into both ends of an optic coil whose rotation is to be sensed. At least one frequency shifter is placed to affect the frequency of the beam to introduce or adjust a nonreciprocal phase shift. The beams are then mixed back together and the resultant beam is detected and analyzed by suitable circuitry to provide an output indicative of the rotation of the light path.

Abstract: Liner bushings and bearing assemblies are securely captured within their receiving holes by a new staking system. The inner and outer surfaces of the webs of metal adjacent the actual staking groove which are to be bent over or staked are fabricated such that these surfaces are substantially parallel to each other over the majority of the surfaces. The staking process is advantageously accomplished by use of a self-aligning staking anvil which has a gap in its circumference in order that the tool may conform exactly to the staking groove. Additionally a master matching gauge ensures proper installation.