Abstract: An improved cost-optimal state feedback control system for stabilizing the nertial reference platform in all-attitude inertial guidance systems which uses the "region" control concept. It reduces the computational requirements of cost-minimizing state feedback to within the capacity of aerospace vehicle onboard control processors. The control system iterates the feedback compensation process so as to reduce the R-gyro error to essentially a zero value and to prevent the gimbal assembly from entering a "gimbal lock" orientation.

Abstract: A compression wall and tension spoke structural system which transfers lateral loads from the sea surface to the sea floor efficiently. The cellular breakwater combines tension piles and concrete fabric forms with oceanwheel structural elements to form cells which are serially placed in tangential contact to produce a breakwater of desired shape and length in shallow water.

Abstract: A cylindrical interferometric hydrophone having an axial hollow free-flooded volume includes an outer fiber wrap for a sensor leg and an inner fiber wrap for a reference leg. Both inner and outer fiber wraps are wound on elastomers and exposed to seawater for sensing acoustic signals. In operation an increased pressure shortens the outer wrap and lengthens the inner wrap. This use of both the sensor and the reference legs to detect signals gives increased sensitivity.

Abstract: A self-contained, expendable sea-state measuring device which deeply submed submarines can launch in order to determine sea surface conditions prior to a missle launch. The device comprises a multi-chambered, buoyant cylindrical metal shell which houses a sea-state measuring instrumentation package, a moment correcting counterwieght, a long data downlink with spooling means and a bouyant lifting body which "flies" the data wire away from the launch platform. The buoy is launched from the submarine via the aft signal ejector, buoyantly ascends to the surface, and then transmits sea surface information back to the submarine via the data link.

Abstract: An acoustically transparent voided, polyvinylidene fluoride (PVDF) hydrope made of material whose impedance matches the characteristic acoustic impedance (.rho.c) of sea water, having drastically reduced diffraction and resonance effects. The frequency response is thus flat at frequencies less than one-half elastic wavelength in the PVDF material. An array of such hydrophones in front of a projector saves space without affecting projector performance.

Abstract: A thick film passive network on an alumina substrate, the passive elements being terminated by conducting metal leads. The network, substrate and a small portion of each lead is encapsulated in a material with high insulation characteristics. The geometry of the leads and overall package alignment characterizes the device as a wire wrap SIP, use of which provides the capability of high board density and closer board-to-board spacing.

Abstract: A towable broadband submarine antenna system for deployment in the ocean ing operation comprises an antenna element including a metallic termination tip and a length of single conductor buoyant cable. A broadband amplifier connects to the antenna element and provides separate paths for the VLF/LF and the HF/VHF signals with amplification provided only to the HF/VHF signals. The signal from the broadband amplifier is further transmitted on a coaxial cable.

Abstract: A spokewheel convertible buoyant cable antenna is comprised of a multipliy of machined metal and molded or extruded plastic components. These parts are designed to be quickly assembled in such a way as to be watertight at all practical depths. They have sufficient tensile strength so as to be towed at reasonable speeds, either on the surface or submerged. The assembly may be disassembled in the field, for repairs. The design also allows it to be easily inserted into a conventional XU-4 type antenna thereby doubling the usefulness of the standard BCA system when this spokewheel capability is needed. The spokewheel version may be quickly converted back to the standard XU-4 version.

Abstract: A light induced unidirectional light switch is described wherein a unidirectionally emitting medium is obtained using the method of Doppler compensation by light-induced velocity-dependent light shifts. The emission in the emitting medium can be switched on by a pulse of laser light which acts as a light induced light switch.

Abstract: A unidirectional light amplifier is described wherein laser light is utilized to create an anisotropic medium in which light is fully amplified in only one direction and fully absorbed in the opposite direction. It is analogous to the way in which a junction diode conducts electrical current more easily in one direction than in the other direction.

Abstract: A semi-foamed polyethylene tape for use in the molding of foamed jacket pethylene cables. After tumble mixing low density foaming polyethylene, ethylene vinyl acetate co-polymer and polyethylene color concentrate, the tape is extruded on a thermoplastic extruder having a maddox mixing screw that effectively mixes polyethylene compounds and a slot die with a suitable opening dimension. The tape is then quenched. By controlling manufacturing variables the tape is foamed to 40% to 50% of its maximum. The tape is then foamed to 100% maximum during the manufacturing of a cable assembly.

Abstract: A towable broadband submarine antenna system for deployment in the ocean ing operation comprises an antenna element including a metallic termination tip and a length of single conductor buoyant cable. A broadband amplifier connects to the antenna element and provides separate paths for the VLF/LF and the HF/VHF signals with amplification provided only to the HF/VHF signals. The signal from the broadband amplifier is further transmitted on a coaxial cable.

Abstract: A semi-foamed polyethylene tape for use in the molding of foamed jacket pethylene cables. After tumble mixing low density foaming polyethylene, ethylene vinyl acetate co-polymer and polyethylene color concentrate, the tape is extruded on a thermoplastic extruder having a maddox mixing screw that effectively mixes polyethylene compounds and a slot die with a suitable opening dimension. The tape is then quenched. By controlling manufacturing variables the tape is foamed to 40% to 50% of its maximum. The tape is then foamed to 100% maximum during the manufacturing of a cable assembly.

Abstract: A method for measuring the velocity of a scatterer in a moving fluid by examining the spatial structure of the optical field on the detector of a Laser Doppler Velocimeter (LDV). The optical field after scattering from the laser beam is a traveling wave of a shape dependent on the detector optics alone. A pair of differential linear arrays are used to find the direction of velocity of the traveling wave and hence that of the scatterer. Furthermore, this method eliminates the Doppler pedestal which requires high pass filter in most of the conventional methods.

Abstract: Double-sided, high-frequency response heat flux gauge for use on metal turbine blading consists of a metal film (1500A) resistance thermometer sputtered on both sides of a thin (25 .mu.m) polyimide sheet. The temperature difference across the polyimide is a direct measure of the heat flux at low frequencies, while a quasi-ID analysis is used to infer the high-frequency heat flux from the upper surface history.

Abstract: A compact refrigeration heat exchanger comprising coiled tubing wrapped around a cylindrical chamber having input and output ports for preheating the evaporatior output to superheat liquid refrigerant prior to the compressor inlet by passing hot gas from the compressor output back through the coil while low pressure refrigerant flows through the chamber. The heat exchanger enables a refrigeration system to be defrosted without liquid refrigerant flood back to the compressor. Any liquid remaining accumulates in the heat exchanger due to the different lengths of the tubing in the heat exchanger.

Abstract: An energy-absorbing foundation provides both large and small scale absorpn of mechanical energy over a broad frequency band using a combination of linear and non-linear energy-absorbing means positioned between a region where the energy arises and another region where personnel and property may be located. The linear and non-linear energy absorbing means may be connected in series or in parallel and act as a mechanical fuse and shock snubber, respectively. One embodiment uses a double reverse corrugate metal and another embodiment uses side loaded tubes as the non-linear energy absorbing component of the disclosed energy-absorbing foundation. Elastic springs may be used in both embodiments as the linear energy absorbing component.

Abstract: A chip capacitor comprising a plurality of parallel plastic organic film ers which film layers may further include organically bonded ceramic particles, interleaved with multiple thin parallel non-precious metal electrode film layers of aluminum, copper or the like, the capacitor further comprising suitable non-precious metal end caps and connector means the surfaces of adjacent dielectric films and electrodes being bonded together using bonding agents selected to provide the mechanical stability of the film chip capacitor.

Abstract: New transition and inner transition metal chelate polymers and method for nthesizing thereof. Such polymers are used as positive or negative resists of high sensitivity for lithographic purposes in integrated circuit chip fabrication requiring submicron resolution. The polymers when irradiated undergo scission or crosslinking events which affects their solubility in developer solvents. They are synthesized either in non-aqueous solution with subsequent removal of excess solvent or interfacially with almost instantaneous precipitation of the polymer at the interface.

Abstract: A fast Fourier transform (FFT) data address pre-scrambler technique and cuit for selectively generating pre-scrambled bit reversed, data address sequences needed to perform radix-2, radix-4 and mixed radix-2/4 fast Fourier transforms.