Abstract: Compounds of the general formula: ##STR1## wherein R.sub.1 is selected from the class consisting of ##STR2## R.sub.2 is an isomer of an aromatic dialdehyde selected from the class cisting of phthalaldehyde, naphthalene dialdehyde, phenanthrene dialdehyde, anthracene dialdehyde, biphenyl dialdehyde, terphenyl dialdehyde; and mixtures thereof and R.sub.3 is an isomer of an aromatic diamine selected from the class consisting of benzene diamine, naphthalene diamine, phenanthrene diamine, biphenyl diamine, and terphenyl diamine, and the cyano-condensation resins thereof which are useful in preparing semiconductors.

Abstract: An intense, space-charge-neutralized, pulsed ion beam is used to heat a magnetically-confined plasma, such as a tokamak plasma, by injecting the ion beam into the plasma along a trajectory that is generally perpendicular to the confining magnetic field. For proper beam parameters, the ion beam will propagate across the magnetic field in the vacuum region, penetrate the confined plasma, and deposit its energy in the interior of the plasma.

Abstract: Air revitalization compositions containing potassium superoxide which furr comprises from about 2 to about 10 weight percent of lithium monoxide, from about 0 to about 2 weight percent of silicon dioxide, and either from 5 to 10 weight percent of lithium metaborate or from 3 to 8 weight percent of calcium sulfate.

Abstract: Backward-wave oscillations in a helix or helix-derived traveling-wave tube re prevented by dimensioning the conductive shell surrounding the helix so that the backward-wave space harmonic of the slow-wave interaction circuit has a cutoff frequency in the vicinity of the frequency of the potential backward-wave oscillations. Lossy material is disposed between the shell and helix so that there is strong coupling between the electromagnetic field and the lossy material near the cutoff frequency of the backward-wave space harmonic.

Abstract: A method of separating one isotopic species of a given element from a mixture. Collisionless plasma instabilities slow down the ions and oppositely charged electrodes separate the isotopes.

Abstract: A method and device for diluting a first gas mixture having a known conceation of a given gas to obtain a second gas mixture containing a lower known concentration of the given gas. The device enables one to mix gases with appropriately low concentrations of a particular gas such that the gaseous mixture may be used to calibrate an instrument that measures such low concentrations of a gas.

Abstract: A vinyl polymer-fluoroalkylether oligomer composition useful as a structu material, filament, adhesive, or abhesive which comprises:A vinyl polymer selected from the class consisting of polyvinylchloride, polyvinylidene chloride, copolymers of vinylidene chloride and vinyl chloride, copolymers of vinylidene chloride and acrylonitrile in proportions in which vinylidene chloride is at least 70% by weight, polymethylmethacrylate, and polystyrene; and a fluoroalkylether oligomer of the general formula:F[C(CF.sub.3)F--CF.sub.2 --O].sub.m -- C(CF.sub.3)F--CO--Rwherein m is an integer from 4 to 10 and R is further defined by the formulas:OR.sup.1 (OR.sup.2).sub.n OR.sup.2 (1)wherein R.sup.1 is an alkyl radical having from 1 to 3 carbon atoms, R.sup.2 is an alkyl radical having from 1 to 3 carbon atoms, and n is an integer from 3 to 10,OR.sup.3 (2)wherein R.sup.3 is an alkyl having from 1 to 10 carbon atoms,N--(C.sub.p H.sub.2p OH).sub.2 (3)wherein p is an integer from 2 to 4,N (CH.sub.2).sub.q CH.sub.

Abstract: Compounds of the general formula: ##STR1## wherein R.sub.1 is an isomer of phthalaldehyde; R.sub.2 is an isomer of an romatic dialdehyde selected from the class consisting of phthalaldehyde, naphthalene dialdehyde, phenanthrene dialdehyde, anthracene dialdehyde, biphenyl dialdehyde, terphenyl dialdehyde; and mixtures thereof and R.sub.3 is an isomer of an aromatic diamine selected from the class consisting of benzene diamine, naphthalene diamine, phenanthrene diamine, biphenyl diamine, and terphenyl diamine, and the cyano-condensation resins thereof which are useful in preparing semiconductors.

Abstract: An emissive member for a controlled-porosity, dispenser-type cathode comping a three-component sandwich consisting of: (1) a supporting disc; (2) a layer of nonsintered alkaline earth material on said disc; and (3) a thin perforated foil on said layer. The foil is made of refractory metal and has a uniform pattern of tiny holes through which the active material of the reservoir migrates to coat the surface of the foil, the foil thus serving as the electron-emitting surface of the cathode.

Abstract: An aircraft landing system which provides a pilot a perspective view of a nway on which he intends to land under zero visibility conditions. The system includes a multiplicity of microwave transmitters spaced at known intervals along both sides of a runway and a timing generator which causes the microwave transmitters to transmit in sequence. The aircraft contains a monopulse receiver which provides conventional azimuth angle video information to a CRT display and also provides range video information to a Y sweep generator. The latter Y sweep generator generates a sweep voltage for the Y axis of the CRT display which is of sufficient length to display all transmitted pulses from all microwave transmitters in sequence with the correct relative spacing between microwave transmitters.

Abstract: Increasing the stability of composite energetic compositions containing ctalline high-energy nitrates or nitrites by the inclusion of saligenin into the composition.

Abstract: A method for preparing ceramic material from a polymer which comprises selecting a polymer from the class consisting of poly(diorganosilanes), poly(haloorganosilanes), poly(carbosilanes), polysilazanes, polycarbocarboranes, and polyborazines; heating said polymer to a temperature from 700.degree. to 2000.degree. C at a rate of at most 100.degree. C/hr. in an inert atmosphere for at least one hour; and cooling to room temperature at a cooling rate which avoids thermal stresses.

Abstract: Optical radiation reflective surfaces for use in an unstable resonator laser system in which the output beam of the system does not contain an aperture in the middle of the beam thereby avoiding the requirement of a collimation lens system to obtain a beam of minimum divergence. The system provides an output beam which does not have a central hole.

Abstract: A target indicating system includes a high-range-resolution monopulse radar hich produces four dimensions of data: a range trigger signal, elevation angle error data, azimuth angle error data, and range video data. Additionally included is a display system having an x-y display for presenting the four dimensions of data. The display is improved by the addition of a sweep generator, elevation summary amplifier, and azimuth summing amplifier which cause the trace on the display to be driven diagonally and generate an isometric presentation of the four dimensions of data.

Abstract: The effects of simultaneous platform motion and antenna scanning are compated for in radar systems of the moving-target-indicator type. Signals from auxiliary sub-arrays of the antenna compensate signals from main sub-arrays of the antenna for the effects of antenna scanning. Delayed, scanning-compensated signals from the main sub-arrays are then combined with undelayed, uncompensated signals from the main sub-arrays to provide signals that are compensated for the effects of scanning motion and platform motion. A first embodiment provides a clutter canceller having motion compensation at each stage of cancellation. A second embodiment provides a large number (N) of motion-compensated signals which are synchronized in time and phase for further MTI processing.

Abstract: The effects of platform motion or antenna scanning in radar systems of the oving-target-indicator type are compensated for by arrangements which use difference-channel signals to correct sum-channel signals for the changes in phase and amplitude of the backscattered sum-channel signals due to the platform motion and antenna scanning, respectively. Clutter-canceller arrangements having motion compensation at each stage of cancellation and an arrangement for providing a large number (N) of motion-compensated signals which are synchronized in time and phase are shown.

Abstract: Multipath signals are eliminated at all but the lowest elevation angles awing monopulse techniques to be used to determine target height and azimuth in a two-dimensional, fan-beam, search-radar system. A narrow-azimuth fan beam is oriented at an angle to the vertical plane and has its boresight centered approximately on the horizon so that a V-beam is formed by the direct beam and the portion of the direct beam reflected from the surface (i.e., the portion that is below the horizon). The reflected beam does not interfere with the direct beam except in a multipath region near the reflecting surface. Frequency diversity or a receive-only beam in the vertical plane may be used to determine if a target is in the multipath region.

Abstract: A tapped surface acoustic wave (SAW) delay line with time-resolved outputs sing piezoelectric leaky wave coupling and bulk wave amplification, and having low loss characteristics. A solid piezoelectric semiconductor is placed adjacent to a solid piezoelectric substrate. A pulsed rf input signal is applied to interdigital transducers (IDT) on the substrate. The applied signal launches a SAW in the substrate in a direction parallel to the interface between the substrate and the piezoelectric semiconductor solid. Upon reaching the interface, the SAW is piezoelectrically leaky-wave coupled across an air gap to a bulk acoustic wave in the piezoelectric semiconductor. Reflections of the bulk wave occur at both surfaces of the piezoelectric semiconductor, and piezoelectrically couples back across the air gap to excite a SAW on the piezoelectric substrate. The resultant rf output includes the normal delayed SAW pulse and additional delayed and time-resolved pulses.

Abstract: Acrylic fibers coated with one or more manganese oxides; the use thereof to remove trace materials from liquids such as water; a method of preparation thereof which comprises soaking the fiber in alkali metal permanganate; and another method of preparation which comprises soaking the fiber in sequence in an alkali metal base, in manganese salt solution, and in an alkali metal base.

Abstract: A system for automatically sampling fog-water at a known rate, for determng the electrical conductivity, and for retaining fog-water samples for additional related study. The conductivity of the collected water is used to estimate total salt content of the fog and/or air, which determines the availability of salts to act as the condensation nuclei for fog and haze.