Abstract: A magnetic fluid transducer for producing a low-frequency sound field in a fluid medium. The device comprises a non-magnetic cylindrical housing with end windows. The housing is surrounded by a magnetic-field-generator means and contains a magnetic fluid within the housing. The magnetic field penetrates the housing and interacts with the magnetic fluid. A body force is developed within the fluid which produces an internal pressure in local regions defined by the lines of magnetic flux. This internal pressure is transmitted by an acoustic transmitting medium to the surrounding fluid as a sound pressure level.

Abstract: Grain-oriented polycrystalline or single crystal magnetostrictive materials n the general formula Tb.sub.x Dy.sub.1-x Fe.sub.2-w, Tb.sub.x Ho.sub.1-x Fe.sub.2-w, Sm.sub.x Dy.sub.1-x Fe.sub.x-w, Sm.sub.x Ho.sub.1-x Fe.sub.2-w, Tb.sub.x Ho.sub.y Dy.sub.z Fe.sub.2-w, or Sm.sub.x Ho.sub.y Dy.sub.z Fe.sub.2-w, wherein O.ltoreq.w.ltoreq.0.20, and x+y+z=1. X, y, and z are selected to maximize the magnetostrictive effect and the magnetomechanical coupling coefficient K.sub.33. These material may be used in magnetostrictive transducers, delay lines, variable frequency resonators, and filters.

Abstract: In an echo-ranging homing torpedo having means for normally transmitting rch pulses at a predetermined repetition rate, and having a receiver wherein detection of target echo signals, during listening intervals between search pulse transmission instants, is limited by the presence of reverberation signals, said receiver including a TVG amplifier followed by a signal amplitude-threshold type of detection circuit for discrimination of target echo signals from said reverberation signals, the gain-increase characteristic of said TVG amplifier normally being set to limit target-echo detection sensitivity to an extent preventing false-alarm response under the maximum reverberation conditions which may occur during target search action, in combination:(a) means, responsive to initial detection of target echo signals, for switching said torpedo from a target search phase to a boresight homing phase of operation;(b) means becoming effective, when target echo detection occurs within an echo return time of preselected v

Abstract: A hydraulic power and control system which includes a pump which is mounted n a sealed housing. The pump is mounted in the sealed housing along with a pilot operated power valve. The pump has an inlet within the housing for intaking oil therein and is connected to the pilot operated power valve for operating components in a functional system, such as a submersible docking apparatus. The pilot operated power valve discharges oil into the sealed housing and is connected to a control valve which is located exterior of the housing. The control valve will pilot operate the power valve and discharges oil within the sealed housing. The control valve may be mounted within a pressure casing which receives a reduced oil pressure from the pump within the sealed housing. The sealed housing may be pressure compensated to ambient so that the pressure casing is maintained at a specific pressure level above ambient.

Abstract: A system and method of obtaining the maximum amount of information availa in photographs or other objects in which the optical density is far below normal. The system makes use of an unconventional system of illumination combined with conventional projection imaging optics to form a real image of the object using only light scattered by the individual particles which form the object.

Abstract: A lithium, thionyl chloride battery is provided with an electrolyte which kes it safe under a reverse voltage condition. The electrolyte is niobium pentachloride which is dissolved in the thionyl chloride.

Abstract: An improved method of synthesizing bisorthodinitriles having the formula: ##STR1## where R is an aliphatic or aromatic radical, which involves dissolving the eactants in a dipolar aprotic solvent such as dimethylformamide, and heating the mixture to reflux until the completion of the reaction. The usage of such solvents permits the reaction to be completed at least ten times as fast as the prior-art method, while the volume of solvent used is also reduced by a factor of ten.

Abstract: The present invention concerns using star sightings to supplement the ineal instruments in nonfixed launch systems so as to provide increased accuracy without refinement of the inertial systems. It is particularly applicable to a system in which the missile is launched from a moving base of uncertain position. A stellar fix is obtained by pointing a sensor in the direction of a star, scanning the optical field of view through an elongated slit which is parallel to the pitch axis and centered along the missile roll axis, rotating the missile 90.degree. to interchange the pitch and roll axes and scanning again to establish another coordinate on the first star sighted and a single coordinate on a second star.

Abstract: A method and apparatus for using pressure changes to indicate volume chan in fluid level indicators or other devices with the required degree of sensitivity and accuracy is provided. A change in fluid volume is indicated by detection and display of a concurrent pressure change in a captive volume of air.

Abstract: An instrument having a logarithmic response is provided which continuously easures rates of rainfall over a range of from 0.3 to 350 mm/hr by determining the electrical power required to evaporate the water as it arrives on an exposed sensor. The sensor determines the flux of rain or cloud water arriving on its surface and consists essentially of a porous, water absorbent, dielectric material held between two metallic electrodes across which a fixed electrical potential is maintained. The water is evaporated by electrical heating as it arrives on the surface, and the amount of power required is a measure of the mass flux of water to the collecting surface.

Abstract: Method and protective coating composition for preventing or minimizing costion or melting of titanium and combustible alloys thereof. Two layers of coatings are applied, the first layer preventing diffusion of the second layer into the titanium or alloy even at elevated temperatures, and the second layer suppressing titanium combustion. The first layer contains chromium, molybdenum, niobium, tantalum, vanadium, zirconium, platinum, or rhodium or a combination thereof or alloy of any of these metals. The second layer contains copper, aluminum, gold, nickel, silver, cobalt or a combination thereof or alloy of any of these metals. By preventing diffusion of the second layer into the substrate, the first layer prevents degradation of substrate engineering or mechanical properties.

Abstract: A general purpose decoy launcher comprising two concentric cylinders and ing a launch platform attached to the inner cylinder by a load bearing hinge. The muzzle portion of the launch platform is attached to one end of an elevating mechanism, the other end of which rides in an inclined surface fabricated as part of the outer cylinder. Motion of the launcher to and from the firing configuration is accomplished by the holding of the outer cylinder stationary while rotating the inner cylinder with respect to it. Relative motion between the cylinders causes the elevating mechanism to rise on the inclined surface, thus elevating the launch platform to the firing angle. Launching tubes are located within the confines of the launching platform.

Abstract: 2.

Abstract: A practical charging mechanism for an electrogasdynamic spectral anemometer sing ultraviolet radiation. Ultraviolet radiation issues through windows in the wall of a test section through which flows a turbulent gas. The UV ionizes aerosol particles in the gas flow. A metallic rod which is connected to a high voltage source picks up ions of one polarity and a collector downstream neutralizes the ions of the opposite polarity. The current generated at the collector is measured and analyzed.

Abstract: A system for time-compressing radar video is disclosed to improve the grac presentation thereof on a CRT display. Quantized input video is pipelined as cell pairs into and out of a pair of parallelly-arranged memory banks by means of input and output latches. The memory banks are controlled having alternating read and write modes which are interchanged in synchronism with the video scan period so that a preceding scan is read out of one bank at a controlled read clock frequency while a current scan is written into the other bank at a fixed write clock frequency, the degree of video compression being determined by the ratio of the read-to-write frequencies. A pair of series-connected rate multipliers each are fed 6-bit rate words for varying the read clock frequency on either a linear or non-linear scale.

Abstract: An iodine-doped polyfluorometallophthalocyanine having the repeating unit [(PcMF) (I).sub.x ] wherein Pc represents a phthalocyanine moiety, M represents a III-A metal selected from the class consisting of aluminum and gallium, and x is from about 0.01 to about 3.4 if M is aluminum and x is from about 0.01 to about 2.3 if M is gallium.

Abstract: A process for improving the shape change memory properties of a titanium-kel base alloy by (1) heat treating the alloy to convert the TiNi phase to CsCl (B2)-type crystal structure, (2) cold working the alloy to increase the micro-twining, and finally (3) thermal cycling the alloy through the transition temperature range (TTR) while a load is applied in order to improve the orientation of the micro-twins.

Abstract: A tough, ablative-resistant, dielectric ceramic material is constructed using powder metallurgy techniques. The composite comprises a boron nitride particulate phase immersed in an Al.sub.2 O.sub.3 matrix. The boron nitride particles are preferably 3-5 microns in size, and create the capability of sustaining thermal strains without generating the thermal stresses that lead to material failure. The composite displays superior mechanical strength characteristics.

Abstract: An automatic elevator control system including high and low speed, up and wn, braking, emergency stop, door interlock, slack cable, overtravel, motor overload, select floor and run/stop operations. The system employs an electrically passive elevator wherein position sensing is achieved at each deck by a pair of proximity switches. The control system logic uses these proximity switches to denote low speed/elevator high, stop/elevator at deck and low speed/elevator low condition. The system automatically takes into account elevator overshoot and well as interim high speed operations. The system design criteria and logic are established to allow for use of self testing proximity switches and miniature high speed relays that may be visually monitored and easily tested. These relays are used for low current logic functions and not for power transfer functions.

Abstract: The synthesis and subsequent polymerization of highly aromatized phthalonile monomers which contain phenoxy linkages having a substantially aromatic spacer moiety between the two terminal phthalonitrile groups is disclosed. The phthalonitriles are synthesized by a nucleophilic displacement of a nitro substituent, which is activated by the ring cyano groups on the aromatic ring, by a phenoxide containing unit. The phthalocyanine polymers have improved toughness, low water absorptivity and higher thermal and oxidative resistance than currently available polymers.