Abstract: A composite of PZT (Lead Zirconate Titanate) and a compliant polymer matrix aving 3-1 connectivity (i.e., in a diphasic material, one of the two phases is continuously self-connected in all three mutually perpendicular directions and the second phase is self-connected only along one of the three mutually perpendicular directions) and fabrication method thereof is described. An array of parallel PZT rod elements is embedded in a mechanically compliant polymer matrix with their axes along the direction of the poling electric field. Such a composite has a high value of g.sub.h, d.sub.h and g.sub.33 with very little sacrifice in the value of d.sub.33.

Abstract: Propulsion means of an undersea vehicle comprises a pair of counter-rotat low speed impellers driven from a spider shaft rotating at relatively high speed. The reduction is accomplished by a variable speed reducing and torque transmitting device which allows infinite resolution for speed control including a zero speed setting while maintaining a constant high speed at the input spider shaft. Attitude of the vehicle is controlled by a plurality of regulated inlet ports and roll control is regulated by increasing the speed of one impeller and decreasing the speed of the other. The sea water utilized for the attitude is also used for propulsion. Control systems within the vehicle utilize an electro-pneumatic-hydraulic system complex.

Abstract: A radially compliant acoustic line array hose with improved toughness and wear resistance, suitable for use in towed acoustical line array sonars. The hose comprises a long extruded cylindrical tubing of a soft flexible grade of geophysical, plasticized polyvinyl chloride material with longitudinal ribs of a stiffer, harder grade of geophysical plasticized polyvinyl chloride material located at or near the tubing surface, and spaced uniformly around the circumference of the tubing. The ribs are melt-bonded to the softer thermoplastic material while each is in their respective melt stages during the extrusion process.

Abstract: A method for making a radially compliant acoustic line array hose with imved toughness and wear resistance, suitable for use in towed acoustical line array sonars. The hose comprises a long extruded cylindrical tubing of a soft flexible grade of geophysical, plasticized polyvinyl chloride material with longitudinal ribs of a stiffer, harder grade of geophysical plasticized polyvinyl chloride material located at or near the tubing surface, and spaced uniformly around the circumference of the tubing. The ribs are melt-bonded to the softer thermoplastic material while each is in their respective melt stages during the extrusion process.

Abstract: A shaft mountable, portable, low frequency FM transmission device for comicating rotating shaft mounted sensor information to a stationary platform. It includes a generally cylindrical, dynamically balanced sending unit attached to and encircling the shaft and a remote stationary receiver having a preamplifier and pickup loop encircling but not touching the sending unit. Information from shaft mounted transducers is transmitted from the shaft to the receiver using low frequency FM techniques. Low frequency FM operates at low power which permits use of small batteries containable in a reduced volume, requires minimal receiver electronics, allows undistorted signal transmission at high RPM's and is relatively insensitive to axial and radial shaft movement.

Abstract: A thermally protective multilayered fabric has a thermally conductive layer andwiched between an outer and an inner thermally reflective layer. The outer and the inner thermally reflective layers are foil/fabric laminations and the intermediate thermally conductive layer is a metallic foil lamination. A plurality of metal staples or other discrete fasteners anchor the three layers together at a plurality of discrete locations which create a multitude of thermally impeding air spaces between the layers.

Abstract: A high power sonar pulse generator driven by a low power electrical motor erein a flywheel, placed in the mechanical system, connects the small motor and large generator. Since the large power output from the pulse generator is required only intermittently, the energy stored in the rotating flywheel allows a small motor to effectively drive the large output pulse generator while a braking effect on the flywheel is used to vary the sonar impulse producing an advantageous FM glide.

Abstract: Ultra low resistance heterojunction ohmic contacts to semiconductors such gallium arsenide (GaAs) is described wherein a single crystal layer of germanium degenerately doped with arsenic is deposited on gallium arsenide using molecular-beam epitaxy (MBE). A metallic film is then deposited over the single crystal layer of heavily doped germanium so as to obtain a non-alloyed heterojunction ohmic contact having a very low specific resistance.

Abstract: A low loss buoyant coaxial cable has its buoyant material placed between conductors to allow for maximum cable cross section for electrical transmission. In addition the strength members are placed radially inward of the center conductor to reduce wearing of the strength members and keeping the electrical performance independent of the electrical properties of the strength members. An alternate embodiment has buoyant material centrally located and the strength members placed with buoyant material between the coaxial conductors.

Abstract: An applied traveling potential wave induces a traveling wave of electrical harge in the liquid phase of a dielectric working fluid providing an electrical traction which pumps the working fluid from a condensing section to an evaporating section of an electrohydrodynamic inductively pumped heat pipe. In one embodiment, a surface electrical traction is induced along an open interface that extends along the liquid phase return flow circuit, and in another embodiment, the electrical traction is induced in the liquid bulk of an inhomogeneous dielectric working fluid along the liquid phase return flow circuit.

Abstract: A process for polymerizing cycloalkenes into polyalkenamers is described wherein trisubstituted silyl groups are attached to the cycloalkenes. The silyl groups thus attached do not act as a poison to the polymerization process. Trimethylsilyl group can be substituted by other desired functional groups after the polymerization.

Abstract: Propulsion means of undersea vehicle comprises a pair of counter-rotating w speed impellers driven from a spider shaft rotating at relatively high speed. The reduction is accomplished by a variable speed reducing and torque transmitting device which allows infinite resolution for speed control including a zero speed setting while maintaining a constant high speed at the input spider shaft. Attitude of the vehicle is controlled by a plurality of regulated inlet ports and roll control is regulated by increasing the speed of one impeller and decreasing the speed of the other. The sea water utilized for the attitude is also used for propulsion. Control systems within the vehicle utilize and electro-pneumatic-hydraulic system complex.

Abstract: An apparatus for rejection of turbulence induced flow noise for towed hydhone arrays. Two adjacent hydrophones in the array are spaced less than flow noise coherence distance apart forming a flow noise cancelling module. The inverted acoustic/flow noise signal from the lead hydrophone of the pair is split, one side passing to the final stage of signal processing while the other side, filtered, amplified and inverted, is added to the combined signal from the lag hydrophone which has been filtered and amplified. The acoustic signal components cancel leaving only the lead hydrophone flow noise plus the lag hydrophone flow noise which has been shifted by a factor dependent upon tow vessel speed and hydrophone spacing.

Abstract: Synthesis of new (lithiophenoxy)phosphazene high polymers is described whin polymers such as poly(dichlorophosphazene) are used as the starting material to prepare poly(organophosphazenes) by reaction thereof with sodium para-bromophenoxide. Poly(organophophazenes) thus obtained are used in a metal-halogen exchange reaction with n-butyllithium. The lithio derivatives thus obtained are used as reactive intermediates for the synthesis of polymers of formulas [NP(OC.sub.6 H.sub.4 X-p).sub.x (OC.sub.6 H.sub.4 Br)y].sub.n and [NP(OC.sub.6 H.sub.4 Li-p).sub.x (OPh).sub.y ].sub.n, where X is PPh.sub.2, PPh.sub.2 C.sub.4 H.sub.9.sup.+ Br.sup.-, SnPh.sub.3, AuPPh.sub.3, or COOH.

Abstract: A target simulator tests the characteristics of a multi-element array witt the use of large memories and long delay line storage. The simulator includes a master clock which provides the count frequency to a binary counter. The reading of the binary counter is compared in a comparator with a stored number in a sequence from a programmable readable memory (PROM). On agreement the comparator feeds an output to an appropriate member of a group of hydrophone counters. Upon receipt of the signal from the comparator the counter provides a signal to the PROM. The PROM then provides its next synchronizing binary number to the comparator. The hydrophone counter also provides a signal to the channel selector reset which resets an appropriate pseudo-random noise generator (PRNG) to produce an output of the target simulator.

Abstract: A system for analog-to-digital conversion provides a dynamic range in exc of 120 dB yet requires an output of only 9 bits. These bits are utilized to transmit a companded digital word format including sign information. Use of this companded output format results in significant transmit bandwidth reduction compared with transmit bandwidths required for conventional linear bit formats. This companding results in a worse case error of 3.125%.

Abstract: An apparatus and method for quantitative nondestructive testing (NDT) of a wire wherein noncontacting ultrasonics is used. A transmitter-transducer coil is held in close proximity of a test wire or tube and high amplitude electrical current pulses are passed in the coil. A magnetic field perpendicular to the longitudinal axis of the wire is applied in the region. As a result of the electrical current pulses in the transducer coil, eddy currents are produced on the surface of the test wire. As a result of the magnetic field applied in the region, these eddy currents lead to Lorentz forces in the wire, which in turn generate corresponding torsional waves in the test wire. These waves speed down the wire and are received by a reciprocal transduction process, by means of a receiver-transducer. The velocity and attenuation measurements of the torsional waves along the axis of the test wire are made precisely and accurately via multiple-transducer setups.

Abstract: A dual mode transducer has the capability of high power active transmission t two separate frequencies more than two octaves apart with broad bandwidth at both frequencies. The low frequency transducer is a standard double mass loaded longitudinal vibrator which has a head mass composed of a small array of high frequency transducers. The high frequency transducers are either half-wave resonators or tonpilz types. These high frequency transducers have a nodal plate mounting. The head mass of the low frequency transducer has a plurality of apertures which accept the high frequency transducers. The rear of each high frequency transducer is recessed into an aperture and has air as an acoustic pressure release. Both low and high frequency transducers form part of an electrically steerable array.

Abstract: A thermochemical energy storage and mechanical energy converter system utzing a turbine. The system has a power or discharge phase, and a reactivate or charge phase. In the power phase ammonia gas is released by CaCl.sub.2.8NH.sub.3, expanded in a turbine and combined with ZnCl.sub.2 to form ZnCl.sub.2.NH.sub.3. In an example of the reactivate phase, ammonia gas is released by ZnCl.sub.2.NH.sub.3 and added to CaCl.sub.2.NH.sub.3 to form CaCl.sub.2.8NH.sub.3.

Abstract: A method for determining optimum element spacing for a low frequency, log-periodic acoustic line array comprising a plurality of omnidirectional hydrophones arranged in a line wherein the spacing between hydrophones is based on a logarithmic relationship using multiple dipole pairs, each pair centered about the acoustic axis of the array, such that the distance between each dipole pair bears a constant ratio to the wavelength of the acoustic frequency band to be investigated by that hydrophone pair. Each dipole pair relates to a particular frequency band and the assembled array covers at least a decade range of frequencies through juxtaposition of contiguous frequency bands. The overall arrangement assures retention of selected beam pattern directionality over the entire decade range of frequencies.