Abstract: A flexible lower body negative pressure (LBNP) anti-G suit for protecting against the adverse effects of -G.sub.z acceleration is disclosed. Conventional anti-G suits protect against the adverse effects of +G.sub.z acceleration. Accelerations in the negative z direction, -G.sub.z, can also cause adverse physiological effects and, additionally, severely unpleasant subjective sensations. LBNP has been used in the past to alleviate the somewhat similar physiological effects of weightlessness in space. It has also been used with merely limited success to treat various medical problems. The present invention provides an improved LBNP suit that successfully alleviates the adverse physiological and subjective effects of -G.sub.z accelerations. Applying LBNP to an aircrew member increases venous vascular volumes in the lower body and reduces the otherwise increased pressures in the upper cardiovascular system.

Abstract: An aluminum or aluminum alloy surface is coated with molten AgNO.sub.3, the ilver nitrate is decomposed (at about 450.degree. C.-550.degree. C.) leaving a thin layer of silver metal, and then an inter-diffusion layer of silver and aluminum is formed (at about 570.degree. C.-660.degree. C.). The treated surface can be soldered by conventional means.

Abstract: A hydrophone or other acoustic vibration sensing apparatus having a disk circumferentially supported for flexure induced by acoustic vibrations and wound on each side with a flat spiral of optical fiber fixedly attached to the disk side so that flexure of the disk due to the vibrations lengthens the spiral on one side and shortens the spiral on the other side. The spirals are connected as two legs of a fiber optic interferometer to provide an output corresponding to the vibrations while canceling errors due to pressure and temperature effects common to the legs. A pair of the disks and associated optical fiber spirals may be mounted on opposite ends of a body with the outer spirals connected as one interferometer leg and the inner spirals as another leg to cancel differences in the lengths of the legs due to acceleration induced flexure of the disks and to provide double the sensitivity to pressure differential of a single disk.

Abstract: The enhancement of rock fragmentation and rock excavation by neutralizing the rock surface charge with respect to the drilling, tunneling, cutting, grinding, or polishing fluid. Water-soluble, high-molecular-weight, nonionic polymers are employed to neutralize the surface charge on the rock, thereby promoting increased drilling, cutting, tunneling, grinding and polishing performance resulting in increases in drilling, tunneling, cutting, grinding and polishing penetration rate, extensions in bit, cutting tool, grinding media, and polishing tool life and dust suppression.

Abstract: A monoclonal antibody is disclosed which is reactive to Treponema denticola nd produced by the hybridoma deposited under ATCC HB 9967. The invention also disclosed diagnostic reagents and methods for detecting Treponema denticola utilizing the hybridoma deposited under ATCC HB 9967.

Abstract: A graduated-load spring washer system for screws and threaded fasteners uses a deflection coil spring of slightly less than one coil with special end configurations for anti-marring. A cross-section of the coil spring is substantially trapezoidal, with the outer periphery thickness being the dimension of the trapezoid base and larger than the inner thickness dimension. When placed under the head of a threaded fastener and flattened upon tightening of the fastener, the device maintains a large tailored preload to prevent loosening even during and after stress relaxation and creep, and eliminates the need for a usual flat washer below the coil to prevent marring. The device also eliminates requirement for use of torque application measuring tools because preload can be determined by sight or tactile sensing.

Abstract: A device for monitoring combustion efficiency of a burner with a burner fe has an acoustic sensor probe positioned within the burner, flame signature generating circuitry responsive to the acoustic probe, means for correlating flame signatures with known optimum efficiency characteristics to yield an indication of relative combustion efficiency, and output means for display of the relative combustion efficiency.

Abstract: A system for detecting the presence of intruder targets in an area under ar surveillance and in which the number of normal targets may vary, including the processing of gated time sample receiver signals through a first monitoring circuit having a counter and comparator means to develop output signals representing deviation of actual time sample count from a normal reference count, and through a second monitoring circuit including additional counter and count trigger means for developing an alarm signal responsive to continued deviation of actual count from reference count over several actual counts in a time sequence of counts such that normal variation of target number will not produce an alarm signal.

Abstract: Apparatus for determining the electrical characteristics of a superconductive material in a range of microwave frequencies and in a range of cryogenic temperatures has the material incorporated within a resonant cavity mounted on a cold finger for maintaining the material at a predetermined temperature. A pair of test waveguides extend oppositely of the cavity and terminate in separable waveguide junctions for passage of microwave energy to measure the microwave characteristics of the cavity as affected by the superconductive material. The cavity and test waveguides are enclosed in a vacuum chamber from which the cold finger extends for connection to controlled temperature cryogenic cooling equipment. The chamber also contains a plurality of calibration waveguides which extend parallel to the test waveguides, each calibration waveguide terminating oppositely in separable junctions.

Abstract: A double-injection transistor structure with an MOS gate is utilized as a guided-wave electro-optic phase modulator at infrared wavelengths in a silicon-on-insulator (SOI) waveguide. Cathode, gate and anode regions are integrated in the waveguide, longitudinally. The effective phase modulation is given by the voltage-variable overlap of the guided-mode optical field with carrier-induced local changes in the silicon refractive index. An electron-hole plasma is injected under the gate by cathode and anode. Using depletion-layer widening, the plasma channel width and mode overlap are controlled very rapidly by one or two low-power gate electrodes.

Abstract: An anatomically shaped earseal is provided for headset earcups. The earseal s thinner at the top than at the bottom and gradually widens toward the bottom to evenly distribute the pressure and provide a tight seal with the wearer's head.

Abstract: A sabot for an armor-piercing fin-stabilized discarding-sabot penetrator is rovided formed of continuous filaments wherein the sabot is preferably bucket shaped and the filaments are sufficiently long to be wrapped from the obturator rearward around the projectile base, and forward to the obturator on the opposite side of the sabot. The filaments are formed of glass, pyrolytic graphite or other high tensile strength light weight material. The sabot preferably has grooves to mesh with similar grooves on a penetrator body and some of the filaments are angled into at least a portion of said grooves.

Abstract: A system for emulating the memory characteristics of a motor-driven rotat memory having multiple heads per track and/or single heads per track with odd modular memory lengths. It is intended as a cost effective alternative for replacing magnetic rotating memories. The emulation is accomplished by multiplexing an offset memory address during each bit time. Non-volatile memory arrays translate the memory address to an offset address that is proportional to the odd modular track length of the multiple/single head track. Input/output registers are used for each read/write head that is emulated. An emulation address controller is used to generate all timing and initial addresses.

Abstract: A mobile sonar surveillance system having a fully populated circular shaped orizontal receiving array steered in edgefired directions with overlapping coverage of beams. The array has a plurality of hydrophones randomly spaced and mounted on a series of parallel lines in the same horizontal plane and is suitable for towing by a single small ship. For alignment of a received signal one or more single beams suitable for rotation can be steered azimuthally with the proper set of synchronized variable delays. These beams will retain approximately the same parameters as they rotate.

Abstract: The invention is directed to a fluid mixing device in which a jet of first luid is passed through a nozzle having a conical inlet section and a noncircular, elongated, exit section. The jet of first fluid mixes with a second fluid located downstream of the device. In operation, the intersection of the conical and elongated sections produces axial rotation in the first fluid. Intense, three-dimensional, axial and circumferential vortical structures are created. These structures then interact with the high modes of azimuthal instabilities that are common to the elongated configuration. The jet of first fluid evolves into two secondary jets, generating a double shear layer inside the flow. Highly efficient mixing of the fluids, in both the outside and inside (core) segments of the jet, is achieved within a relatively small mixing space.

Abstract: A system is disclosed which will improve the flashover strength of high-voltage insulators in vacuum. Treatments which deposit a small amount of metal on an insulator surface can improve flashover performance. This process applies commercial ion-implantation techniques to achieve a quasi-metalized surface on a vacuum insulator. By making the metal a part of the structure of the insulator near the surface, the ion-bombardment process yields a surface which has the same electrical properties as a metalized surface achieved by other methods, with the additional advantage of mechanical and electrical ruggedness.

Abstract: A long life high current density cathode is made from a mixture of tungsten nd iridium powders by processing the mixture of powders with an activator into a porous billet, and then impregnating the billet with a quaternary compound including barium, oxygen, a metal selected from the group consisting of osmium, iridium, rhodium, and rhenium, and a metal selected from the group consisting of strontium, calcium, scandium and titanium, by firing the billet in a dry hydrogen furnace at a temperature at which the impregnant melts.

Abstract: A versatile, dearmer using small arms cartridges that is low cost, may be usable, and can employ various types of destructive projectiles including water, clay, shot and steel slugs. A novel feature is a shock tube firing circuit which, when combined in a multiple barrel embodiment, produces multiple projectiles with a high degree of firing simultaniety.

Abstract: An omnidirectional variable thrust propeller for a vehicle includes a hub, plurality of blades, and a plurality of shafts. Each shaft is coaxially rotatably connected to a respective blade and extends through the hub at an acute angle to a hub longitudinal axis. Each shaft has a lever arm and an inner end portion which terminates inside the hub. A reciprocably moveable device engages the inner end portions of the blade shafts to uniformly rotate the blades in one direction when the device moves longitudinally in one direction and uniformly rotate the blades in an opposite direction when the device moves in an opposite direction to enable a change of thrust. Another device pivotally supports the reciprocably movable device at a variable acute angle to the longitudinal axis. Another device selectively move the reciprocably movable device about the pivot point to nonuniformly change the rotation or pitch of the blade that alters the propeller's thrust direction.

Abstract: A method for remotely detecting the angular position of a rotatable code wheel is provided by generating two sine wave modulated light beams which are orthogonally polarized with respect to each other. The beams are combined and then directed through a polarization filter mounted on the code wheel. The combined beam incurs a phase shift with respect to a reference signal which depends upon the position of the code wheel. The combined polarized beam provides angular position resolution between zero and ninety degrees, but lacks quadrant resolution. Two other light beams are directed to a two channel digital mask pattern imprinted on the code wheel. The mask pattern encodes these latter beams with "on" or "off" pulses to provide quadrant resolution. The beams are converted to digital electric signals which are received by a programmable read oly memory (PROM). The PROM provides an output corresponding to the angular position of the code wheel to a display.