Abstract: A valve mechanism for an acoustic modulator which modulates air flowing tugh the acoustic modulator. The valve mechanism comprises a pair of cylindrical shaped members with each member having a plurality of elongated ports. The first cylindrical shaped member is held in a fixed position, while the second cylindrical shaped member is movable with respect to the first member. There is located at the lower end of the second cylindrical shaped member a drive coil which is positioned in a magnetic field such that when the coil is excited by an electrical sinusoidal input signal, movement of the second member occurs, partially aligning the ports of the second member with the ports of the first member which opens the valve mechanism. The sinusoidal input signal causes a frequency "doubling" to occur, that is the valve mechanism of the present invention completes an open-close-open-close cycle during each cycle of the sinusoidal input signal.

Abstract: A neuron for an artificial neural network provides digital weighting of input signals at a common portion of the neuron rather than at each synapse. The neuron is adapted for use of differential signals, and the weighting may be provided by field effect transistors of different widths, by subtracting a plurality of differential signal components from an opposite most significant component, or by subtracting one half of a differential signal component from the opposite next most significant component. The neuron may provide binary sign selection and digit selection by switching input and reference signals at each synapse.

Abstract: A multipurpose bus interface comprising a digital signal processor which eives a clock signal and control signals from a Manchester type encoder/decoder and then processes the clock and control signals allowing for the serial transfer of data to and from the 1553 multiplex data bus, the encoder/decoder and the digital signal processor into an IC memory card for storage in or retrieval from the IC memory card. Software stored in an electrically erasable programmable read only memory controls how the data is transferred and interpreted making it easier to modify the digital signal processor's operation to accommodate its use with different bus standards and data protocols/formats. The encoder/decoder of the present invention formats and protocols data transferred from the electrically erasable programmable read only memory to the 1553 multiplex data bus as well data transferred from the 1553 multiplex data bus to the memory, as appropriate.

Abstract: Chemical vapor deposition process for producing indium-containing semiconductor materials, particularly III/V indium-containing semiconductor materials, using triisopropylindium as the source of indium. In the process a flow of triisopropylindium and a flow of a group V source or precursor, e.g. AsH.sub.3, are directed into a reactor in contact with a heated substrate. The triisopropylindium and group V precursor are at least partially decomposed, depositing by chemical vapor deposition an indium-containing III/V semiconductor material on the substrate. The result is lower pyrolysis temperatures and less carbon impurity incorporation into the indium-containing semiconductor material than when commercially available indium sources are used.

Abstract: An ultrasonic system for determining the quality of concrete under water hout inaccuracies caused by electromagnetic interference from the ultrasonic generator. An ultrasonic generator applies pulses to the concrete. An ultrasonic detector detects the ultrasonic pulses and produces corresponding signals that are indicative of ultrasonic pulses that have passed through the material. Signal processing circuitry processes the signals to determine the transit time of the ultrasonic pulses through the material. The signal processing circuitry is disabled for a predetermined time after application of each ultrasonic pulse to the material to prevent noise produced by the means for applying ultrasonic pulses to the material from entering the signal processing circuitry and causing spurious measurements.

Abstract: The oscillations found to occur in the cavities of an structural frame moving through a fluid are substantially eliminated by the adoption of perturbation elements located at the leading edge of the cavity and reflecting any remaining oscillations out of the cavity at the trailing edge. The perturbation elements may take the form of multiple pins of various shape and geometrical arrangement which prevents the generation and growth of vortices causing acoustic oscillations. The reflection of remaining oscillations out of the cavity may be accomplished by ramping the trailing edge of the cavity.

Abstract: An improved method of producing a controlled fragmentation warhead case by mbedding an expanded metal liner on the interior surface of a casing for a warhead or other ordnance device. The process of embedding an expanded metal liner into the casing during the forming of the casing produces a controlled fragmentation grid on the interior surface of the casing. The improved method of producing a controlled fragmentation warhead case is particularly suitable for weapon systems employing large, unitary warheads.

Abstract: A measuring apparatus which accurately locates reinforcing bars in underwater concrete structures such as piers, retaining walls, easements and the like and measures the amount of concrete covering each reinforcing bar. The measuring apparus comprises a probe which generates a magnetic field and which is moved over the surface of the underwater concrete structure under test. When the poles of the magnetic field are in parallel alignment with and directly over a reinforcing bar within the structure a disturbance occurs in the magnetic field with the magnitude of the disturbance being indicative of the depth of concrete covering the reinforcing bar. An electronics module electrically coupled to the probe provides an analog output signal which is indicative of the distance between a reinforcing bar within the concrete structure under test and the probe.

Abstract: An autonomous real-time adaptive video target detection and position locan apparatus and method. Adaptive low pass filters produce horizontal leading and trailing edge and vertical thresholds from each frame of input target and a background or clutter video signal. A user selectable input is used with the three adaptive thresholds, input video, and horizontal synchronization signal to produce a signal representing valid target detection and position information.

Abstract: A decoy device for deployment in a marine environment to decoy heat seeking issiles from their intended target. The device consists of a canister of fuel and means for igniting the fuel. The canister is designed such that the operation of the device creates a spray of burning fuel and a resultant large radiation area decoy.

Abstract: A method for allowing a correlation function to be applied to binary codes f length 3 to length 128. A user may specify the desired length of the binary codes for correlation processing; whether the binary code is to use a phase sidelobe level as the threshold or a sidelobe amplitude as the threshold. The user will also be asked to specify the threshold as well as an in phase coefficient referred to as alpha and an out of phase coefficient referred to as a beta. The user may also specify that the codes be expanded which results in correlated compounds having a length twice that of the specified length being displayed to the user. When the user has specified the parameters for correlation processing of the binary code length selected by the user, the program of the present invention will process the binary codes eliminating allomorphic and symmetrical forms of the codes from correlation and then display the results to the user.

Abstract: A dye laser comprising a solid styate laser medium and a pumping energy sce, the laser medium comprising a lasing concentration of a water or alcohol soluble organic dye which is incorporated into a hydrolyzed silicon organometallic solution, and forming a gel which is dried to form a transparent silicate glass which is doped with the organic dye.

Abstract: A soluble, extended-release composition containing a benign acidic agent preventing and dissolving plaque build-up in pipes on board a ship which is not environmentally harmful. The composition can be manufactured into a self-contained, safe to use unit which is easy to dispense, easy to monitor, and leaves no waste product to be manually disposed of.

Abstract: A method and apparatus for determining the stress-slip relationship of specimens in concrete including a pipe with a plurality of longitudinal slots evenly spaced around the circumference of the pipe, a specimen and concrete block located in one end of the pipe, a confining device for applying a constant force to the circumference of the concrete block before, during and after a test, a device for measuring the displacement of the specimen relative to the concrete block, and a device for measuring the radial displacement of the concrete block.

Abstract: The new compound tertiarybutyldimethylantimony is prepared by reacting an timony trihalide SbX.sub.3 with the tertiarybutyl Grignard reagent ((CH.sub.3).sub.3 C)MgX, treating the resulting product with the methyl Grignard reagent (CH.sub.3)MgX. where X is a halide, and recovering tertiarybutyldimethylantimony from the reaction mixture. The reaction is preferably carried out by a one pot synthesis in a suitable solvent such as diethyl either using approximately one equivalent of ((CH.sub.3).sub.3 C)MgX in relation to the SbX.sub.3 at about -50.degree. C., followed by treatment with approximately two equivalents of (CH.sub.3)MgX in relation to the SbX.sub.3 at about 0.degree. C. The tertiarybutyldimethylantimony is used as a precursor in forming antimony-containing semiconductor material by chemical vapor deposition.

Abstract: An apparatus is provided for cooling electronic components mounted on a cuit board. The circuit board is placed in thermal contact with a heat sink enclosure that has an interior cavity and a release opening that provides a path from the interior cavity to the external ambient. A meltable pellet blocks the release opening. A wick is bonded to the inside surface of the interior cavity. The device is sealed with a working fluid that permeates the wick. When the components get hot, the heat is transferred through the heat sink enclosure to the working fluid in the wick, causing the working fluid to vaporize. The vapors remain trapped in the interior cavity until the pellet melts, allowing the vapor to be released and the temperature of the heat sink enclosure to be stabilized or lowered.

Abstract: An optic fiber payout test system and apparatus is disclosed which is adad for simulating the payout of fiber at high speeds. This optic fiber payout test apparatus is comprised of a projectile, a source of fiber attached to the projectile, and a pneumatic propulsion system to propel the projectile and initiate the payout of the fiber. The fiber payout test apparatus further comprises a projectile track system as well as a braking system which allows the projectile to be used safely within a laboratory environment. The optic fiber payout test apparatus also provides a means for testing the payout of fiber optic cable in a manner that simulates the high rate of speed and high accelerations encountered during free flight. This capability is important for the development of launched fiber optic guided weapons systems and in particular, air launched optic guided weapons systems.

Abstract: A ramjet solid fuel composed of Hydroxyl terminated polybutadiene aluminum, agnesium, and boron carbide is described. The high volumetric heating value fuel of the present invention significantly increases the distance range of missiles.

Abstract: An accelerometer or seismometer has a pair of flat spirals of optical fiber and has one or more elastic disks bearing a mass and supported for flexure. Each spiral is fixedly attached to a corresponding disk side so that disk flexure lengthens a spiral on one disk side and shortens a spiral on an oppositely facing disk side, the spirals being connected as legs of a fiber optic interferometer so that the interferometer provides an output corresponding to the flexure. A pair of the disks may be mounted oppositely of a sealed body with a pair of the spirals arranged to minimize the effect of pressure changes on the sensor, and a pair of the spirals may be mounted oppositely of a thermally conducting disk to minimize temperature differences between the spirals. The mass may be centrally mounted on a disk with the disk peripherally supported, or the mass may be distributed around the disk periphery with the disk centrally supported for isolation from mounting strain.

Abstract: A slave controller with block transfer capability for transferring data blocks of between one and two hundred fifty six sixteen bit words between a memory and the VERSA MODULE EUROPE bus (VMEbus). The slave controller comprises a programmable array logic device which receives control and address modifier signals from the VMEbus and an address enable signal from a decoding circuit which provides the address enable signal to the programmable array logic device in response to an address strobe signal provided by the VMEbus. The programmable array logic device being responsive to these signals enables the memory for a read or write operation. The programmable array logic device next provides a write pulse to the memory when data is to be written into the memory at addresses provided by a binary counter.