Abstract: Acoustical shock waves are generated by electrical sparks within a gap between electrodes adjustably positioned for exposure to water adjacent a surface immersed therein. High voltage electrical energy derived from a constant current power supply, is stored in a capacitor for rapid. application to the electrodes by discharge during cyclic periods of short duration under remote control in order to render the acoustical shock waves so generated effective in preventing biofouling of the surface by organisms in the water.

Abstract: Nonlinear current modulation of a relativistic electron beam is achieved by ts propagation without interruption through a resistive wall type of drift tube assembly within a klystron amplifier. Maximized beam current modulation is thereby attained for a beam propagation distance within a shortened drift tube.

Abstract: A process for synthesizing novel conjugated amino substituted phenylene pmers is disclosed. The process results in polymers having non-linear optical properties, and the polymers can be converted to electrically conductive polymers. The process involves reacting a novel bis-cycloalkylene sulfonium salt of 2,5,N,N-tetramethylaniline hydrochloride, such as 2,5-(N,N-dimethyl)aniline hydrochloride dimethylene bis-(tetramethylene sulfonium chloride) with alkali metal hydroxide to form a cycloalkylene sulfonium salt precursor polymer, and then heating the precursor polymer under conditions to produce the amino substituted phenylene vinylene polymer, such as poly(2-(N,N-dimethylamino) phenylene vinylene). Another process involves treatment of the bis chlormethyl dimethyl aniline hydrochloride derivative with alkali metal alkoxide.

Abstract: Ceramic materials based on solid solutions of chromium diboride (CrB.sub.2) nd niobium diboride (NbB.sub.2).

Abstract: A radar decoder circuit for converting NRZL Data to radar video data which s supplied to a radar video display screen. The radar video circuit includes an Erasable Programmable Logic Device which decodes incoming NRZL data to identify a frame sync having twenty four data bits. When the frame sync is identified the location of sixteen bits of synchro data is also determined. The synchro data is then latched into a latch within the Erasable Programmable Logic Device for processing by a Digital-to-Synchro Converter. Control signals for effecting a transfer of the synchro data to the Digital-to-Synchro Converter are provided by enable and latch signal generating circuit within the Erasable Programmable Logic Device. The Digital-to-Synchro Converter converts the digital synchro data to analog synchro signals which are supplied to the radar video display allowing the display to indicate the direction the radar from which the NRZL data is received is pointing.

Abstract: Comb-shaped polymers, comprised of hydrophilic backbones and dye-containi hydrophobic side chains are synthesized for use in multilayered, noncentrosymmetric, thin films by means of Langmuir-Blodgett processing techniques. The second harmonic signal generation exhibited by these films increases quadratically with the number of layers of polymeric dye in the film.

Abstract: A free electron laser for use with a short-pulse relativistic electron source. The device includes a resonant optical cavity in which a spatially-periodic magnetic field is produced by a wiggle magnet assembly. An input optical beam having a wavelength lying within the gate bandwidth of the free electron laser interaction is injected into the cavity. A beam of relativistic electrons produced by a short-pulse source, such as an RF-linac, is injected into the cavity. The electron beam and the input optical beam interact under the influence of the magnetic field to amplify the input optical beam.

Abstract: A method and apparatus for reducing cyclic losses due to doppler shifting frequency-derived phase coded expanded radar pulses using new expanded pulse codes which increase the number of phase elements without increasing compression ratios. These new expanded codes may be generated by sampling the phase characteristics of a chirp or step-chirp waveform above the Nyquist rate to derive the phases of the new coded waveforms and compressing the new expanded pulses with a compression ratio equal to the reciprocal of the signal bandwidth.

Abstract: A device for shifting the phase of light propagating through an optical fr, comprising a microbend transducer to bend the optical fiber. The microbend transducer comprises first and second transducer blocks each having a set of teeth positioned so that they face each other with a passageway therebetween through which the optical fiber passes and is bent by them. A device for modulating the intensity of light propagating through an optical fiber which has two tapered ends, comprising first and second mode strippers each operably attached to one of the tapered ends of the optical fiber and a microbend transducer disposed to bend the optical fiber.

Abstract: A method and apparatus for converting an ion beam from a standard ion gun into a neutral particle beam by the processes of resonance neutralization followed by Auger deexcitation and/or Auger neutralization, established by directing the ion beam to pass in the proximity of a suitable metal surface.

Abstract: A magnetic separation device suitable for removing magnetic bead-coated cells from a system comprising a base, a plurality of magnets mounted on the base such that a sample chamber is created for holding sample containers which are to be placed in close proximity to the magnets, and a means for adjusting the position of the magnets with respect to the sample container. A blood sample containing magnetic bead-coated cells is passed through tubing which is mounted in close proximity to the magnets. The magnetic bead-coated cells are attracted by the magnets and retained in the tubing while the nonmagnetic cells pass through the tubing.

Abstract: Pressure and temperature insensitive optical fibers are produced using a Ta.sub.2 O.sub.5 based glass composition which has a high bulk modulus and a low thermal expansion coefficient. The glass composition can function as the cladding in the optical fiber or as a protective coating which surrounds the cladding thereby protecting the fiber from fluctuations in temperature and pressure.

Abstract: A device for detecting small amounts of alkanes such as methane, ethane, propane, and butane gases, comprising an optical waveguide and a light source for propagating light therethrough; apparatus for obtaining samples of air to be tested; apparatus for adding water vapor to these air samples to yield gas mixtures with at least a 30% relative humidity; and means for flowing these mixtures over the surface of the optical waveguide at a rate sufficient to favor condensation of the mixture on the waveguide surface to thereby form a thin film thereon. The presence of alkanes is determined by detecting the intensity of the light after propagation through the optical waveguide and then comparing that detected intensity to a reference. In a preferred embodiment, the optical waveguide is an optical glass capillary in which the surface is closed in a lens-like configuration at the detector end.

Abstract: A decoding device for use in pulse compression radars to decode a novel pe code that has the advantage of precompression bandwidth tolerance. The novel code type is described by the following formula (where .DELTA..phi..sub.k,p is the phase change at the kth subpulse of the pth subsequence within the width of a phase-modulated pulse):.DELTA..phi..sub.k,p =(2.pi./N) [k+pN][p-(1/2)(N-1)]k=0, 1,2, . . . , N-1p=0, 1,2, . . . , N-1 (N any integer)The input signal is fed into multi-stage I and Q shift registers. Each stage in the shift register is fed into an adder, correlation being effected by first multiplying the real and quadrature parts of the signal stored in the stages of the I and Q shift register by a preselected multiplying factor, the sequence of multiplying factors corresponding to the time-reversed and negative phases of the transmitted pulse. The sum signal at the output of the adder corresponds to the auto-correlation function of the received signal.

Abstract: A method is disclosed for the production of antibodies to haptens which comprises binding the hapten to an antibody from one species, injecting the antibody-hapten into another species, and isolating the antibodies produced in response to the hapten.

Abstract: Two interferometric electro-optic modulators formed from single mode waveguides in a single crystal substrate of pockels (linear) electro-optic material is used in conjunction with optical sampling techniques and conventional Analog-to-Digital technology to convert analog signals to a binary representation.

Abstract: An ion mobility spectrometer for analysis of a gaseous sample wherein only nitrogen and phosphorus containing molecules of the sample are ionized. The spectrometer is of the type having an ion source for ionizing the sample gas and a shutter for gating ions into a drift region, wherein an electric field gradient exists. The ion source includes a bead which comprises a thermally stable material, such as a ceramic or glass, having an alkali metal compound on its surface. The bead is immersed in a gaseous mixture of hydrogen and air, and is heated to a temperature of 200.degree.-1000.degree. C. The bead selectively ionizes phosphorus and nitrogen containing molecules of the sample upon contact with the bead.

Abstract: A Field Effect Transistor (FET) capable of withstanding increased positive gate biasing with respect to the source contact without incurring the penalty of drawing excessive gate current, comprising a semi-insulating substrate layer; an active channel layer of doped n-type semi-conductor material disposed on the substrate layer; a first heteroepitaxial semi-insulating layer of a semi-insulating material having a bandgap greater than the bandgap of the active channel layer material disposed on said active channel layer. The first heteroepitaxial layer has a top surface, a designated first region, a designated second region, and a designated middle section disposed therebetween wherein the first region and the second region of the first heteroepitaxial layer are implanted with activated donor impurities to form its source and drain regions. The device is also provided with conventional source, drain and gate contacts.

Abstract: The invention relates to phthalocyanine compounds, and more particularly to the preparation of aryloxy, arylthio, alkyloxy, and alkylthio phthalocyanine compounds and their subsequent incorporation into semiconducting thin films by the Langmuir-Blodgett technique.

Abstract: Liquid oxidizer comprising an aqueous solution of hydroxyl ammonium nitrate nd a nitrate salt that is ammonium nitrate or hydrazine mononitrate.