Abstract: For a filtering-type centrifuge, a pipe assembly composed of a stationary outer pipe with a concentric rotatable inner pipe. The outer pipe has a longitudinally extending distribution port, while the inner pipe has a helically shaped discharge port. The assembly is placed inside the centrifuge and inside of a filtering basket. As the inner pipe turns, portions of the distribution port are intersected by portions of the discharge port. This causes the slurry to exit the inner pipe at the intersection positions and be distributed in an even fashion on the basket.

Abstract: Highly reliable measurements of the fluid and/or fluid flow in a conduit are obtained by insertion within the conduit, upstream of a fluid measuring or sampling device, of a fluid flow straigntening and displacement apparatus which serves to stabilize, homogenize and condition the fluid flow and form at the device a uniform, axially centered, axially symmetrical, well defined and accurately measurable flow profile of large means flow diameter. The flow straightening and fluid displacement apparatus comprises, in sequence in the direction of fluid flow, a first swirl mitigating and flow straightening device, a fluid displacement member comprised of two oppositely facing frustums jointed at their larger ends and mounted coaxially within the conduit, and a second flow straightening device. Advantageous combinations of the flow straightening and fluid displacement apparatus with known measuring and sampling devices are provided.

Abstract: Microcellular carbon filaments having a specific gravity about 20-30% less than conventional carbon fibers made of the same precursor resin are formed by foaming the precursor resin during spinning. These low density microcellular carbon filaments, which may also be hollow, have improved insulation properties compared with conventional carbon fibers, they have a higher than expected strength to weight ratio and adhere in a superior fashion to a variety of matrix materials.

Abstract: Hollow carbon and graphite filaments having a specific gravity of about 20-50% less than conventional solid carbon fibers made of the same precursor resin are formed by spinning hollow precursor resin filaments. These low density hollow carbon filaments have improved insulating properties compared with conventional solid carbon fibers and have an excellent bending strength to weight ratio.

Abstract: Microcellular carbon filaments having a specific gravity no greater than about 1.4 are formed from PAN foamed filaments by carbonizing. These low density carbon filaments, which may also be hollow, have improved insulation properties compared with conventional PAN precursor carbon fibers and can be used as a replacement to rayon precursor carbon fibers where greater insulation is necessary.

Abstract: A woven, stabilized fabric suitable for reinforcing resin matrices is provided. The fabric comprises a woven fabric of graphite, fiberglass, aramid, etc., in which a limited amount of a resin coated fiber is woven into one direction of the fabric. Prior to weaving, the resin coated fiber is initially coated with a resin such as an epoxy, polyimide, etc., followed by drying and then weaving into the fabric with as few picks as possible. When the fabric is heated, the resin coat melts and adheres to the fabric, and imparting stabilizing properties thereto. The stabilized fabric is then set up in a mold for resin impregnation, without undergoing undesirable movement.

Abstract: A continuous-transmission frequency-modulated (CTFM) scan converted sonar with improved capability for detecting swimmers, miniature submarines and other small intruders in harbors and inlets, and adjacent offshore structures. The system is microprocessor based and menu driven from an operator interactive touch screen. The system utilizes a fast fourier transform (FFT) based frequency analyzer for range discrimination. An area moving target indicator (AMTI) portion of the system cancels echo returns from stationary objects that otherwise mask the echo return of the moving targets. The AMTI causes the system to survey the search area for a number of consecutive scans and store the data. On successive scans, only target information that differs from the stored target map is displayed, thereby reducing clutter caused by surrounding terrain.