Abstract: A rescue flotation buoy integrated with a pressurized containment and dispensing device containing a pressurized repellent for sharks. Sodium lauryl sulfate, a well-known shark repellent, is one such material that could be utilized. The repellent material can be dispensed more than one time by the use of a valve connected to the containment and dispensing device. The integration of a rescue flotation buoy and a shark repellent will allow rescue personnel to repel sharks when saving a victim of a shark attack. The purpose is to expose the predator to an immediate high concentration of the appropriate repellent, thereby diverting the predator from its attack. Subsequent applications of the shark repellent can also be performed.

Abstract: A method of fabricating improved semiconductor devices, such as FET's, wh require or are improved by a hyperabrupt interface between the active channel and the underlying insulating region. A substrate, such as GaAs, is polished and then implanted with light ions, such as protons, to amorphize the crystal structure down to a certain depth determined by the ion-beam accelerating voltage and the ion fluence level. The crystal is damaged but not amorphized below the lowest amorphization depth. The interface between the amorphized and the non-amorphized, but damaged, regions is a relatively narrow region which will become a hyperabrupt junction. The substrate is then implanted with donor ions, such as Si, in accordance with the requirements of the device to be fabricated and under conditions which provide a retrograde donor ion concentration profile with depth. An annealing/donor activating step is now performed at a relatively low temperature (600.degree. C.

Abstract: A high-frequency transistor and method of making same wherein the parasitic apacitance between base and collector is reduced. The collector layer of GaAs is impregnated with boron ions to form an insulative region under the base contact structure thereby reducing the capacitance in this region and leaving only the region underlying the emitter structure as the active transistor region.

Abstract: A solid-state, signal conversion circuit for converting electrical, periodic analog signals to other analog signals of different amplitude and/or frequency and/or phase is disclosed. The input signal is demodulated, scaled and sampled and each sample converted, via an analog-to-digital (A/D) converter, to a digital word corresponding to the sample's amplitude. The digital words address a ROM which has other words stored at the addresses in correspondence with the desired values for a preselected output signal. Scaling means is used to keep the input signal to the A/D converter at a constant peak value regardless of fluctuations in the signal level. A comparator and subtractor are used to invert the downslope of input signals to avoid ambiguity problems when the output signal frequency is an even multiple of the input signal frequency.

Abstract: A hydrodynamically balanced quiet control valve for a submarine (underwater ehicle) hovering system. The valve has a cylindrical valve element within a four-port valve housing. The interior of the valve element is divided into three chambers by a pair of parallel partitions extending lengthwise of the element and equally spaced from the element axis. Apertures in the cylindrical wall of the element are arranged, in cooperation with the partitions, to produce substantially constant total flow resistance through the valve when installed in the system, regardless of the angular rotation of the cylindrical valve element. A hover computer controls the angular position of the element in response to sensed pressure variations from the pressure at a preselected hovering depth.

Abstract: A device which transmits an explosion across a bulkhead through a solid hetic barrier while maintaining the barrier integrally intact and without perforating or rupturing it. The barrier separates a first chamber which receives an output explosive-charge from a second chamber which receives a detonating cord. When the detonating cord is ignited it causes an explosive shock wave to cross the barrier and detonate the output explosive charge. The end of the second chamber has a configuration and dimensions congruent with the output end of the detonating cord so that the explosive shock wave directly crosses the barrier without the need for an explosive charge intermediate the cord and barrier wall.

Abstract: Manufacturing process for a solid or hollow shaft consisting of aluminum or itanium with beryllium reinforcing therein. Beryllium rods are either clad with aluminum or titanium or, in the alternative, holes are drilled in an aluminum or titanium block which beryllium material is thereafter inserted into the holes. The preform with a hard steel central mandrel around which the beryllium rods are positioned is placed within a steel can and heated to a predetermined temperature. Pressure is then uniformly applied to outer circumference of the can to ensure uniform deformation of the beryllium reinforcement. The uniform exterior pressure on the outer surfaces of the beryllium rods and the interior pressure on these rods caused by the hard steel mandrel against the under surfaces of the rods as a result of a reduction process causes the beryllium rods to assume an arcuate ribbon configuration. For hollow shafting, the mandrel at the center of the preform may later be removed.

Abstract: A Nernst lamp is used as the pumping means for a solid state laser. The l materials are selected so that the light energy emitted is essentially concentrated in the relatively narrow pump region of the absorption spectrum of the laser crystal. The input power in to the laser is equivalent to that of much higher power lamps operating over a much wider spectrum.

Abstract: A system for controlling the flight of a missile by the use of coded radar signals. A ground level radar transmits coded signals in the form of a phase modulated radar signal. Each coded signal represents a particular guidance command which is received by the missile and "filtered" out of the radar signal by a surface acoustic wave correlator. The correlator detects the code in the signal and in turn energizes a control circuit which operates a control surface on the missile.

Abstract: An analog feedback circuit for producing a null or zero output for two eir in-phase or 180.degree. out-of-phase input signals applied to the circuit. The dc control voltage is applied along with the first input signal to a multiplier whose output is summed with the second input signal in an operational amplifier to provide the amplitude and phase of the control voltage.

Abstract: An annular plug nozzle for a rocket propulsion unit, designed for the shost possible length, and contoured wall structure capable of withstanding exposure to motor chamber and exhaust environment for extended operating time.

Abstract: A solid or hollow shaft has an aluminum or titanium matrix reinforced with rcuate-shaped beryllium ribbons arranged around a central rod or core to form a circular cross-sectional configuration. The shaft has a high degree of torsional stiffness which enables it to be used on advanced aircraft or high-speed rotating machinery without mid-support bearings. The shaft may be formed by cladding the beryllium rods in aluminum or titanium and arranging them around the central rod or core to form a preform with a circular cross-sectional configuration. The preform is then subjected to hydrostatic pressure, causing the beryllium rods to deform into arcuate-shaped ribbons. The core may then be retained or leached out to provide a hollow shaft.

Abstract: 4. A signal-reconstitution method for signals transmitted through a bounded medium comprising the steps of:Propagating a first signal from one point in said bounded medium;Receiving the propagated signal at another point in said bounded medium;Propagating the received signal from one of said points;Receiving the second propagated signal at the other of said points;Reversing the second received signal with respect to time;Propagating said reversed signal from one of said points in said bounded medium; and,When a reflecting object is present at the other of said points, receiving an echo signal at the point at which the reversed signal was propagated, the form of said echo signal approximating the form of said first signal.

Abstract: 1. A system for passively measuring the range between a given point and a second point from which detectable radiations having distinguishable characteristics are emanating, comprising means for receiving at said given point direct radiations from said second point and indirect radiations from said second point which have been reflected from a reflecting surface, means for measuring the angle of elevation of said second point from said given point, means for measuring the altitude of said given point relative to said reflecting surface, a gate circuit for rejecting all direct signals which are not followed by a reflecting signal within a predetermined time span, and computing means for determining the range from said given point to said second point as a function of said direct and reflected signal, said angle of elevation, and said altitude of said given point.

Abstract: A method of and apparatus for detecting air distortion at the inlet of a turbine engine and adjusting fuel flow to anticipate and prevent compressor stall. A plurality of pressure taps are arranged in a spaced relation around the periphery of the engine inlet. A distortion detector senses the differential pressure between the instantaneous pressure at each pressure tap and the ambient pressure of a reference pressure chamber which communicates with the plurality of pressure taps. At a predetermined pressure differential the distortion detector activates a solenoid-operated fuel bypass valve which reduces fuel flow to the fuel nozzles of the gas turbine engine.

Abstract: A universal joint permitting relative angular deflection of two members, vided with transverse stiffness augmentation means which minimize rotational performance penalties. One member contemplates a receptacle adapted to receive in spaced-apart relation therefrom an annular plug formed on the other member. A rolling seal is positioned between the receptacle and plug. Tabs, segments or rings are placed on the annular plug and/or the confronting wall of said one member to increase the transverse stiffness under all load conditions, particularly at angle orientations of the aforesaid two members.

Abstract: A feature of this invention is an improved d.c. restorer circuit utilizing differential amplifier in conjunction with diode feedback to charge a capacitor to a voltage essentially equal to the most negative going excursion of an input signal. This voltage stored in the capacitor is added to the voltage applied at the input of the restorer to produce the restored voltage at its output.

Abstract: A single filter to replace a set of parallel filters in an O-T-H radar coising a prelimiting filter connected to amplifying and limiting means and quenching means for shorting out said prelimiting filter at appropriate times. The prelimiting filter is connected to receive the output of the mixer of one range bin of the velocity-and-acceleration analyzer of the radar and the predetection filter of the analyzer receives the output of the amplifying and limiting means. The quenching means also receives the output of the amplifying and limiting means and provides a quenching signal to the predetection filter.

Abstract: A method for permitting the use of "drop-in" waveguide structures in micrrip applications comprising the steps of: inserting a heavily loaded waveguide that is compatible in size to the stripline into a longitudinal hole cut in the stripline to accommodate the waveguide so that these two components are end-to-end;Attaching the ground plane of the stripline directly to one of the broad-walls of the waveguide; andImpedance matching the top, narrow conductor of the stripline to the waveguide completely external to said waveguide and attaching it to the remaining waveguide broad-wall.

Abstract: A counterwound, magnetic core for a towed-cable, helically wound, ELF anta comprising a cylindrical, plastic, center insert, with or without a center conductor, with two strips or sets of strips of magnetic material counterwound about it so that a plurality of good-mechanical-contact, strip, crossover points are formed distributed around the circumference of the insert and down its length. An insulating material is then wrapped around these counterwound strips and a conductor helically wound around that. This design, by providing alternate flux paths down the core via the crossover points provides a lower, core reluctance and, when the core is under stress, provides a flux path that avoids the high-stress regions of the core thus reducing the amount of flux that is stress-modulated. Thus a substantial magnetostrictive noise reduction is obtained.