Abstract: A distributed loop antenna is embodied in a flexible cable structure for marine E.L.F. (extremely low frequency) radio reception. Several distributed loop and magnetic core configurations which provide "side-looking" reception are described, as is the ability of flexible distributed loops to minimize the induction of noise voltages in the antenna.

Abstract: A cable testing system which eliminates the swivel on the crane hook. Means are provided for attaching a crane weight indicator system (dial scale) to a crane lifting block directly. Steel bars are inserted through the block on the lifting pin and four short slings are attached to these bars. The weight indicator is then hung by these slings, with the cable to be tested connected from the weight indicator to a dead man in the ground.

Abstract: An aerodynamic lift-generating adapter assembly secures to the nose of an guided projectile to provide a capability for flat-trajectory flight. The adapter assembly comprises a rotatably-supported, roll-stabilized lift-generating section coupled to an actuator section containing inertia means to initiate gyroscope rotor spinning. The control gyroscope is directly linked to the lift-generating device to maintain fixed orientation of the lift.

Abstract: A balanced preamplifier is disclosed for impedance-coupling an audio signal source, such as a microphone, to a differential amplifier. In one embodiment, the preamplifier comprises a first stage wherein a pair of complementary bipolar transistors are connected in a common-base configuration and coupled to a low-impedance microphone so that the microphone signal is appied to the respective emitters of the transistors and transformed to an appropriately higher impedance level at the respective collectors thereof with common-mode passage of external and internal noise. A second stage including a complementary pair of bipolar transistors in a common-emitter configuration is coupled to the first stage for greater power and voltage amplification requirements.

Abstract: A spacecraft associated deployable support structure which incorporates a ssive mechanism for extending an elongated arm, having a supporting surface, from a position adjacent to the spacecraft into a position extensive in relation to the spacecraft, whereby solar cells or instrumentation mounted on the supporting surface can be employed for their intended use.

Abstract: An aircraft crewman protective system properly positions the lower legs and eet of the crewman during emergency egress from an aircraft. The system includes a pair of plate members connected to swing outward from the under side of the crewman's console at each leg position and means for deploying the plate members at the time of ejection. Upon deployment, the plate members push the feet of the crewman backward guiding the feet and lower legs within a contact-free envelope during ejection without changing desired spinal position of the crewman.

Abstract: An improved method for etch-thinning silicon devices using three sequential tches. The device is pre-thinned in a hot KOH-H.sub.2 O etch. The thinning etch is a hydrofluoric, nitric, acetic acids (1:3:10) and a precise amount of hydrogen peroxide mixture. The cleanup etch is a potassium permanganate, hydrofluoric and acetic acids mixture. The result is a repeatedly specular, smooth, uniform, 10 micron thick membrane over the pixels with a p.sup.+ surface to enhance the CCI optical response.

Abstract: An explosive device comprising:(1) a metal liner composed of a metal selected from the group consisting of luminum, magnesium, copper, and brass, the liner enclosing a chamber;(2) a liquid contain in the chamber;(3) a layer of pyrotechnic material surrounding the outside of the liner, the pyrotechnic material composed of a mixture of powders of(a) nickel;(b) metal oxide; and(c) an aluminum containing component which may be (i) aluminum or (ii) a mixture of from 50 to less than 100 weight percent of aluminum and from more than zero to 50 weight percent of a metal which can be magnesium, zirconium, bismuth, beryllium, boron, tantalum, copper, silver, niobium, or mixtures thereof; and(4) means for igniting the pyrotechnic material. This device is useful as an explosive, particularly as an underwater explosive.

Abstract: An explosive auto-enhancement device for providing higher detonation pressure than can be achieved with conventional explosives by the use of magnetic precompression for enhancing the detonation wave. A cylindrical armature containing an explosive charge is coaxially spaced within a helical field generator winding with a first end of the armature being electrically coupled to the helical winding. A "seed" magnetic field is provided to the helical winding prior to the initiation of the explosive charge. When the explosive charge is initiated, forming a detonation wave, the other end of the cyclindrical armature expands and is coupled to the helical winding, thus completing the electrical circuit between the winding and the armature. As the detonation wave continues through the explosive charge, more of the coils of the helical winding are short circuited which reduces the inductance and results in increased magnetic flux within the winding.

Abstract: In a process for growth of a layer of semiconductor material by precipitation from a solution of the semiconductor material in a solvent by liquid phase epitaxial growth (LPE), the improvement is the step of adding from approximately 0.01% to 1.0% by weight of a material which forms a stable oxide or sulfide and is soluble in the solvent to the solution prior to the step of precipitating the semiconductor layer to eliminate the deleterious effects of residual oxygen. A relatively short annealing time is required to dissolve the addition in the solvent and allow the addition to react with dissolved oxygen or other impurities before a conventional LPE growth process may be initiated, although high temperature anneals of varying length may precede or follow the addition of the oxide-forming or sulfide-forming material. Zirconium, titanium, vanadium, scandium, yttrium, and aluminum are in general suitable for use as the oxide-forming material.

Abstract: A variable temperature method for the preparation of single and multiple taxial layers of single-phase (e.g., face-centered cubic), ternary lead chalcogenide alloys (e.g., lead cadmium sulfide [Pb.sub.1-w Cd.sub.w ].sub.a [S].sub.1-a wherein w varies between zero and fifteen hundredths, inclusive, and a=0.500.+-.0.003), deposited upon substrates of barium fluoride, BaF.sub.2, maintained in near thermodynamic equilibrium with concurrently sublimated lead alloy and chalcogenide sources. During preparation, the temperature of the substrate is varied, thereby providing an epilayer with graded composition and predetermined electrical and optical properties along the direction of growth. This growth technique can be used to produce infrared lenses, narrowband detectors, and double heterojunction lasers.

Abstract: A controlled environment process for making diode arrays by depositing the sublimate of a semiconductor material through an aperture of a mask placed nearby a substrate and then subjecting part of the sublimate to ion implantation. The aperture causes diffraction of the sublimate vapor stream, while the proximity of the edges of the aperature to the substrate causes the central plateau of the deposited thin-film to have a rounded rim leading to sides that taper smoothly in thickness to the substrate. Ion implantation to a controlled depth creates an isolated planar junction. Surface layers of a gold electrode running onto the substrate from different surface areas of the thin-film provide for off-mesa bonding of electrical leads.

Abstract: A portable machining device that is particularly useful for removing excess peripheral weld from the flat surface of welded-in valves such as breech lock gate valves. The portable machining device includes a housing, a cutting tool, a vertical feed mechanism, a horizontal feed mechanism, and a rotation drive mechanism. The vertical feed and rotation drive mechanisms have central openings for receiving the upward extending valve stem from the surface to be machined. The base of the housing is ring shaped and includes slots for attachment to the flat surface of the valve. In operation, the cutting tool is rotated and fed vertically and horizontally to machine the excess weld to be flush with the flat surface.

Abstract: A ball bearing assembly device for permitting dry assembly of bearings wiut additional equipment. The assembly device is provided with an inner body surrounded by an outer body so as to create a circumferential gap therebetween. The gap is provided with a vacuum connection which allows positioning of ball bearings on a ball bearing shaft or inner bearing ring when the shaft or ring is mounted on the inner body. The bearing shaft is placed into the inner body so as to provide a mounting to aid in insertion of the bearing shaft or ring into the outer bearing ring. The bearing shaft may be mounted on a reciprocating shaft for insertion into the outer bearing ring.

Abstract: A device for grounding a coaxial cable to a ship's hull or bulkhead having n opening for the cable, is configured to include a split metallic cone with serrated apex portions fastenable around a bared shield of the coaxial cable, and flanged base portions securable to the ship's hull and overlying the opening, such that the split cone forms substantially 360.degree. of coupling between the bared shield and the ship's hull. This configuration increases the area and effectiveness of electrical contact between the bared shield and the ship's hull while decreasing the effective inductance and overall impedance, thereby reducing the amplitude of high frequency transients caused by an externally induced electromagnetic pulse (EMP) or any electromagnetic interference source having a similar frequency range.

Abstract: An on-line noise figure measurement system for receivers that produces va results whether or not signals are being received. A narrow pulse having a low pulse repetition frequency and low amplitude is injected into the receiver. A processing circuit cyclically measures the output of the RF stage of the receiver to produce a ratio of two signal values. One value is measured in the absence of any signal entering the receiver while the other value is measured with only the pulse signal impressed on the receiver.

Abstract: A water-displacing paint is disclosed for coating metallic surfaces in hu environments to prevent corrosion. The paint comprises controlled proportions of a silicone alkyd resin to serve as a binder and physical barrier, solvents including ethyl acetate, aromatic mineral spirits and 1,1,1 trichlorotrifluorethane for ensuring water immiscibility, a petroleum sulfonate to inhibit corrosion and aid surface absorption, and an organo-titanate of isopropyl tri-titanate to promote surface adhesion. Selected amounts of titanium dioxide and zinc molybdate are included as pigments in one effective example of the paint to provide it a white color. Alternate colors may be produced conventionally by adding standard tinting pigments in amounts sufficient to yield the desired color.

Abstract: An improved method of coating crystalline high explosives with polyethylene ax comprising:(a) forming a loose slurry of finely divided crystalline explosive particles in water;(b) adding an emulsion of(1) an emulsifiable polyethylene wax,(2) potassium stearate,(3) KOH, and(4) water to the slurry;(c) heating the slurry-emulsion mixture to a temperature in the range of from about 92.degree. C. to about 98.degree. C. with stirring;(d) adding enough acetic acid to the slurry-emulsion mixture to lower the pH to about 6 with stirring;(e) cooling the resulting solution; and(f) isolating the product polyethylene wax coated high explosive particles.

Abstract: A novel low cost air-launched sonobuoy having a spherical housing of a liweight semi-rigid foam housing encapsulated the electronic components. The housing includes recesses for receiving a hydrophone and cable pack, and for inserting D-size batteries just prior to launching. A vertical antenna is wrapped around the housing and prevents the pack from deployment until the sonobuoy is charged with the batteries and immersed in water. The free end of the antenna is released and unwraps to permit deployment of the hydrophone and cable pack. The sonobuoy is stored without the batteries in a sealed moisture-proof envelope which can be easily torn open and removed when desired.

Abstract: A wedge assembly for securing a circuit board in an electronic package gi positive surface contact and excellent heat transfer between the multi-layer board and the electronic package as well as positive lock under vibration and shock. A housing, which may be mounted on a multi-layer board, contains a wedge member having two ramped ends within an open cavity having a single ramped end. Means such as a ramped anvil which slides within the cavity under force from a screw is provided within the cavity for adjusting the wedge member relative to the housing to provide positive contact between the electronic package and the multi-layer board.