Abstract: A device and method for interconnecting multiterminal electronic devices. e device and method combine the use of input light sources, output light detectors and an optical waveguide matrix device for routing the signals from various preselected input terminals to various other output terminals. The optical waveguide matrix device includes a number of intersecting optical waveguides formed on a base. The intersecting waveguides are optically coupled by means of reflecting surfaces formed at the nodes of intersection.

Abstract: A variable phase shifter based on the slow-wave effect for operation in the millimeter wave region, comprising a GaAs substrate for mechanical support; an n.sup.+ doped semiconductor layer disposed on the GaAs substrate for operation as a first ground plane; an n doped semiconductor layer disposed on the n.sup.+ semiconductor layer with a thickness to permit only one mode at millimeter wave frequencies to propagate, while suppressing higher order millimeter wave modes; and a Schottky metal microstrip with first and second ends disposed on top of the n doped semiconductor layer. Means are provided in the form of ohmic contacts for electrically connecting the n.sup.+ semiconductor layer to ground electrical potential. These ohmic contacts are disposed on top of the n doped layer, but are provided with a very large surface area contact to the n doped layer in order to significantly reduce the resistance between the ohmic contact and to the n.sup.+ semiconductor layer.

Abstract: Bandwidth compression of speech signals is done by aliasing the fricativeund signals (4-8 KHz) into the voiced-sound signal band for transmission (0-4 KHz). To minimize distortion, aliasing (foldover) is done only when the fricative band power is more than twice the voice band power.

Abstract: A digital pulse expander-compressor for use in pulse compression radars and having the advantage of precompression bandwidth tolerance. The pulse expander-compressor employs a discrete Fourier transform circuit and multi-stage delay line feeding inputs x(n) to the discrete Fourier transform circuit to generate outputs in accordance with the formulaF.sub.k =.SIGMA.x(n)exp[-jz.pi.nk/N]where n is the sequence number of the clock pulse; N is an even integer corresponding to the number of delay stages plus one and k is the number of the output subpulse from the transform circuit. An arrangement of delay stages differentially delays the output subpulses from the discrete Fourier transform circuit, and a coherent summer adds the real and imaginary parts of the signals from the delay lines. The delay stages delay the subpulse F.sub.k by nN clock pulse intervals where n and k are interrelated by the formulae k=N/2-n for n=0, 1, . . . , and N/2 and k=(3N/2)-n for n=N/2+1, N/2+2, . . . , N-1.

Abstract: Lead zirconate titanate ceramics comprise from about 92 to 99.0 weight pent of lead zirconate and lead titanate in ratio from 0.505 to 0.54:0.495 to 0.46 respectively, from about 0.5 to about 2 weight percent of one or more fluorides or chlorides of an alkali metal or alkaline earth except francium or radium, and 0.5 to 6 weight percent of one or more oxides of magnesium, barium, chromium, scandium, aluminum, lanthanium, praesodymium, neodymium or samarium. The ceramic after pressing is annealed at a temperature from about 1050.degree. to 1350.degree. C. Ceramic elements made from the above ceramics are useful as sonar and microphone transducers.

Abstract: A pressure insensitive optical fiber waveguide comprising an optical fiber including an optical core and a concentric cladding; a substrate concentrically surrounding the optical fiber; and a fiber jacket substrate including at least two coatings concentrically surrounding the substrate wherein the innermost coating has a small Young's modulus and the outermost coating has a high Young's modulus.

Abstract: A factored matched filter/FFT radar Doppler processor for reducing the le of clutter components contained in radar signals. The processor includes a matched Doppler filter, having a filter response matched to the spectrum of the clutter components, through which the radar signal is passed. The filtered output of the matched filter is further filtered by a coherent integration filter to further reduce the level of the clutter components.

Abstract: A salt of 7,7,8,8-tetracyanoquinodimethane (TCNQ) and a structural polymer re dissolved in a mutual solvent. The solution is chilled and subsequently added to a liquid with which the solvent is miscible but in which the TCNQ and polymer are less soluble. A precipitate results which is a massive, conducting, moldable substance stable in atmospheric oxygen.

Abstract: Benzimidazobenzophenanthroline type ladder polymers are doped with Lewis acids, protonic acids, potassium, or an alkali napthalide. The resulting doped polymers are useful semiconductors.

Abstract: A bisorthodinitrile monomer having the formula: ##STR1## and an epoxy monomer having the formula:R--O--A--O--Rare mixed with or without an amine curing agent and heated to a temperature ufficient to induce polymerization. The resulting epoxy-phthalonitrile copolymer has improved properties relative to the epoxy polymers including higher thermal and oxidative stability, higher glass transition temperature, better shelf life, lower water absorptivity, and better electrical properties. The properties of the epoxy-phthalonitrile copolymer can be varied by varying the epoxy:phthalonitrile ratio.

Abstract: A method for generating fine sprays of molten metal for spray coating and wder making is disclosed. Liquid metal is fed via a melt tube to a nozzle that is shaped like the frustrum of a cone. The nozzle is surrounded with gas jets in a coaxial pattern around the melt tube orifice. High pressure gas causes the formation of a low pressure region immediately next to the melt tube orifice that draws metal out of the orifice at a higher rate than would otherwise be the case. The coaxial gas stream atomizes the metal into droplets and thereafter forms a narrow, supersonic spray containing very fine metal droplets suitable for powder making or application of a coating.

Abstract: Phenothiazine Ladder Polymer, PTL (or di-chloro-PTL) was prepared by polydensation of 2,5-diamino-1,4-benzenedithiol with 2,5-dichloro (or 2,3,5,6-tetrachloro)-p-benzoquinone in polyphosphoric acid at 250.degree. C. Phenoxazine Ladder Polymer, POL, was prepared from 2,5-dichloro-p-phenylenediamine and 2,5-dihydroxy-p-benezoquinone under the same conditions as used for PTL synthesis. Di-chloro-POL and other derivatives can be made under a similar condition. These polymers conduct electricity.

Abstract: A process for fabricating an X-ray spectrometer having imaging and energy resolution of X-ray sources. The spectrometer has an array of adjoining rectangularly shaped detector cells formed in a silicon body. The walls of the cells are created by laser drilling holes completely through the silicon body and diffusing n.sup.+ phosphorous doping material therethrough. A thermally migrated aluminum electrode is formed centrally through each of the cells.

Abstract: A collective interactive klystron that utilizes a bent drift tube to achi circular motions of the electrons in the drift region. This bent drift tube eliminates material repulsion between AC space charges in a klystron.

Abstract: A method for making cubic SiC devices comprising the steps of preparing a preform consisting of high purity Si on which a layer of cubic SiC has been deposited by CVD; transferring the preform to a furnace containing a molten bath of Si saturated with SiC at a temperature of between 1600.degree.-1800.degree. C., the saturation being insured by the use of a high purity graphite crucible for the Si; dipping the Si-SiC preform into the molten bath and allowing deposition of more cubic SiC on the SiC layer by reducing the temperature of the already formed cubic SiC layer from the preparing step in relation to the rest of the molten bath.

Abstract: Ions of a particular gas in a mixture of gases are made for mass spectrometry purposes by selectively electronically exciting the target gas and allowing the excited target gas to undergo a charge-exchange reaction with a reagent ion.

Abstract: An improved method and apparatus for producing high power, high efficiency pulsed TEA laser energy at N.sub.2 O wavelengths by suppressing discharge arc formation with H.sub.2 or CO that is added to the N.sub.2 O lasing medium. Energy loading levels up to in the range of 266 J/L atm are achieved with gas mixtures of N.sub.2 lasing mediums and H.sub.2 or CO additives comprising N.sub.2 O:He:N.sub.2 :H.sub.2 ::0.03:0.69:0.27:0.01 and N.sub.2 O:He:N.sub.2 :CO::0.03:0.66:0.26:0.05 mole fraction.

Abstract: A line imager comprising: a semiconductor body; a planar, transparent piezoelectric body having a main surface overlying and in proximity to the semiconductor body; wave propagation means for propagating acoustic waves on the main surface of the piezoelectric body to create traveling potential wells in the underlying semiconductor body; a traveling potential well path located in the semiconductor, the traveling potential well path beginning at the wave propogation means and extending straight away therefrom; semiconductor depletion means for depleting the semiconductor of majority charge carriers along the traveling potential well path, the depletion means located atop the piezoelectric body; a gate located on the semiconductor body and alongside and parallel to the traveling potential well path and adjoining the semiconductor depletion means; a plurality of sensor pixels for accumulating charge, the sensor pixels located in the semiconductor body, the pixels aligned next to each other and running parallel to

Abstract: A tapered z-pinch for externally introducing an electron beam into a parte accelerator that causes only a small development of perpendicular velocity in the electrons of the electron beam, and that causes only a small disturbance to the magnetic field lines of the particle accelerator.

Abstract: A method of fabricating a notched indium phosphide planar transferred electron oscillator device which automatically aligns the high-resistivity notch position immediately adjacent to the cathode contact by slant evaporation of a metal coating over the edge of a masking layer followed by ion implantation.