Abstract: The lasing species of CS(a.sup.3 .pi.) and CSe(a.sup.3 .pi.) are produced by reacting atomic carbon and COS or COSe in an inert medium such as helium, argon, nitrogen, etc.

Abstract: A resiliently compliant, variable stiffness wire mesh structure, primarily for space applications, characterized by its lightweight construction, its compact stowage and deployment capability, and its ability to maintain its nominal shape under widely varying thermal conditions. The structure has a frame supporting a wire mesh including spring-like longitudinally compliant wires which are terminally secured to the frame to constitute primary structural elements of the mesh and are prestressed in a manner such that the compliant spring wires in different sections of the mesh have differing spring rates or stiffness. This non-uniform stiffness of the mesh is designed to maintain the mesh taut under widely varying thermal conditions and thereby avoid the formation of slack in the mesh wires which would allow out-of-plane displacement of the mesh. The described mesh structure is a wire mesh antenna reflector for space applications.

Abstract: An active attitude control apparatus for damping roll/yaw nutation motion within the control deadband of a satellite which is three-axis stabilized to local vertical by means of a pitch biased, body-fixed reaction wheel and offset roll-yaw thrusters. The apparatus is incorporated into a system in which large attitude motion outside the deadband is controlled by means of the offset roll/yaw control thrusters with an accompanying control mechanism for activating the thrusters in an appropriate direction when motion outside the deadband is sensed. The present apparatus includes logic circuitry apparatus to cause a second thruster activation, of the same sense, after each deadband actuated thruster firing, where such a firing in the same sense has not been triggered within a certain elapsed portion of the satellite nutation period, approximately 5/8ths of the period being preferred.

Abstract: A wire mesh structure, primarily for space applications, characterized by its lightweight, its compact stowage and deployment capability, and its ability to maintain its shape under widely varying thermal conditions. The structure has a frame supporting a wire mesh including wires which are terminally secured to the frame and constitute the primary structural elements of the mesh. These structural wires are preformed to a spring-like configuration which renders the wires resiliently compliant with a low spring rate in the endwise direction and are stretched to produce a predetermined tension preload in the wires when the mesh is installed on the supporting frame. This preload retains the mesh in a taut condition under widely varying thermal conditions and thereby prevents the formation of slack in the mesh which would allow out-of-plane displacement of the mesh.

Abstract: An improved fluid expulsion device of the class comprising an expulsion container containing a diaphragm adapted to be displaced by a pressure fluid acting on one side of the diaphragm to expel a second fluid at the opposite side of the diaphragm. The diaphragm is bonded to the inner container wall, either by electrodeposition of a metal on the wall in such a way as to form the diaphragm on and in bonded relation to the wall or by adhesively bonding a preformed diaphragm to the wall by adhesive bands, whereby displacement of the diaphragm is accompanied by peeling of the latter from the container wall without wrinkling, tearing, or ripping.

Abstract: 1. A correlation system for two complex multifrequency input signals which may contain relatively strong narrow band components including the combination of: auto-correlator means responsive to one of the input signals, the auto-correlator means dividing the one input signal into two channels and including delay means in one of the channels for introducing a fixed relative timing displacement between the two signals, threshold means coupled to the auto-correlator means for indicating when the auto-correlation output signal exceeds a selected amplitude, first and second delay means each responsive to a different one of the input signals and introducing like delays thereto, gating means coupled to at least one of the delay means and controllably responsive to the threshold means, and correlator means coupled to said delay means and said gating means for correlating the two input signals therefrom.

Abstract: A thick layer of silicon dioxide is grown on a semiconductive substrate and then etched to form an elongated opening that defines the outer boundaries of a diffused transistor. The thick silicon dioxide layer serves as a permanent fixed, diffusion mask. The first diffusion is performed through the permanent mask opening. Thereafter, portions of the elongated opening are masked by secondary thin layers of silicon dioxide or photo-resist, and subsequent diffusions are performed through different unmasked portions of the elongated opening.

Abstract: This invention relates to laser fuels and, more specifically, to solid fuels suitable for use in a chemical laser.

Abstract: A hand held, vacuum operated desoldering tool and a holder fixture therefor is disclosed in which the desoldering tool has a tubular, barrel body with a nozzle tip forward end and a vacuum line attachment fitting at its opposite, rear end. A trigger is disposed in a trigger housing formed contiguously to the rear end for connecting the vacuum line to the interior of the barrel body and forward tip end of the tool. Thus when the trigger is actuated by the fingertip of the operator, the body is evacuated and an impulse of air is drawn thereinto through the forward nozzle tip of the tool for a desoldering operation. A baffle and filter are disposed within the tubular body to prevent solder and other particles from entering the trigger mechanism and the vacuum supply line.Another component of the combination disclosed is a tool holder and power tip cleaner for the desoldering tool. The tool holder includes a short, large diameter cylindrical body which carries a power piston.

Abstract: There is disclosed a method and apparatus for measuring electromagnetic conductivity within a medium to thereby derive a measurement of the rate of propagation of a magnetic field therein. If one then measures the return time of a pulse transmitted in the medium when a conductivity anomaly is encountered which creates a reflection, a magnetic diffusion radar can be calibrated. This technique enables one to measure the conductivity of a propagation medium such as salt water, earth or the like for any desired purpose such as determining the salinity of sea water or river water. More particularly, however, this enables one to make such a measurement in order to provide an electromagnetic anomaly detector such as is used in metal locaters, mine detectors, and in geophysical prospecting or exploration.

Abstract: A relatively low frequency linear element antenna characterized by its lightweight construction, relatively wide band width, and elastic strain energy deployment capability. The antenna has a plurality of slender electrical conductors such as wires forming radiating elements secured to a supporting tube with the conductors extending lengthwise of and spaced about the tube wall and electrically joined at the base end of the tube in such a way that the antenna has the same radiation characteristic as a conventional cylindrical antenna of the same diameter as the tube. The base ends of the conductors are gathered for connection to the center conductor of a coaxial antenna feed line to provide an impedance match between the antenna and coaxial line. The antenna supporting tube may comprise a thin-walled, resiliently flexible, strain energy deployable tube to permit contraction of the antenna to a folded or coiled packaged configuration and antenna deployment by elastic strain energy stored in the contracted tube.

Abstract: Linear polymers are produced by the reaction of an olefinic end-capped bis(imide) or bis(amide) compound, i.e. a dieneophile with a furfuryl or furan end-capped bis(imide) or bis(amide) compound, i.e. a diene. These linear polymers have an alicyclic endooxy linkage repeated throughout the polymer backbone chain where the furfuryl end-cap combines with the olefin end-cap by Diels-Alder reaction. The linear polymer is converted to a higher performance polymer by heating in the range of 200.degree. to 400.degree.C whereupon the endooxy linkage is aromatized in situ. The resins so prepared are suitable for use in severe environments at temperatures up to 350.degree.C.

Abstract: A digital speech compression system uses a predictive feedback loop. The digital speech signals are compressed within the feedback loop for reducing the transmitter bandwidth. The system comprises a first adder into which the digital signal is fed followed by a quantizer and a compression logic. The predictive loop includes a second adder coupled to the compression logic and followed by a digital predictive filter. The output of the filter is impressed in a negative sense on the first adder and in a positive sense on the second adder. Specifically, the quantizer and compression logic may consist of a two-valued limiter followed by a compressor and a converter in the feedback loop or alternatively the limiter may be followed by a converter while the compressor is disposed outside the feedback loop to provide sample by sample compression.

Abstract: A multifrequency laser oscillator which generates coherent light of two closely adjacent optical frequencies in rapid succession for recording contour holograms by the double exposure technique. The two light frequencies are selected by an optical intercavity frequency selector which is rotatable to a first position to select one frequency and to a second position to select the other frequency. The described laser oscillators have a ruby lasing medium and lase at the R.sub.1 and R.sub.2 transitions of the ruby resonant fluorescence.

Abstract: A work clamp for clamping a workpiece to a work table with a clamp member which extends and retracts to and from clamping position with a compound motion having components parallel to and normal to the table in a manner such that extensile movement of the member occurs both parallel to the table to a position over the workpiece and toward the table to clamp the workpiece against the table, and retractile movement of the member occurs both away from the table to release the workpiece and parallel to the table to clear the workpiece for removal from and placement on the table.

Abstract: A drill module for use in a holographic borehole instrument which is operable to determine the stress in the wall of a borehole by recording successively on the same holographic recording medium two holograms of a selected surface region of the wall and, in the interval between the two recordings, drilling a stress relief hole in the wall in stress relieving relation to the selected surface region to produce on the recording medium a double exposure hologram containing holographic information representing the stress. The drill module embodies a drill which is normally retracted from the field of view of the holographic system to permit unobstructed holographic recording of the selected wall surface region and which is extended into the field to drill the stress relief hole in the interval between the two holographic recordings.

Abstract: A waveguide structure is fabricated by plating a mandrel with a high electrical conductivity metal, such as copper; plasma spray coating the plated mandrel with a selected waveguide body material; forming coupling flanges about the plated mandrel at the ends of the plasma spray formed layer; and removing the mandrel in such a way that the plated metal and plasma spray formed layers remain intact to form a tubular waveguide body with an inner high conductivity liner. The waveguide structure described is a plural cavity bandpass waveguide filter which is fabricated on a mandrel comprising separable sections arranged end to end. Plated iris discs are clamped between the confronting ends of the mandrel sections prior to metal plating plasma spray coating of the mandrel, such that when the mandrel is removed, the iris discs remain intact with and peripherally joined to the filter body liner to define the resonant filter cavities.

Abstract: In a charge coupled device provided with a two-phase overlapping gate structure, charge flow directionality is built into the structure by forming an asymmetrical potential well beneath each gate electrode with a single offset mask. High packing density is achieved in an array of staggered bits and with each bit being designed to have a geometry of minimum size.

Abstract: Monomeric high molecular weight dianhydrides or tetraacids can be produced by the nucleophilic coupling of a halo substituted phthalimides acid and an aliphatic or aromatic compound having polyfunctional groups capable of reacting with the halo moiety of the phthalinide followed by hydrolysis and dehydration. Specifically, 4-chlorophthalate sodium salt is converted to an imide to reduce side reactions with the carboxylic acid groups prior to reaction with 4,4'-disodiumdiphenylene oxide sulfone or 2,2-di (4-sodium phenoxide) propane. After the reaction of the imide and the sulfone or propane compounds, the diimide formed is converted to the corresponding dianhydride.

Abstract: In a parallel resonant circuit having an inductor connected in parallel with a capacitor, a sensing resistor is connected in series with the inductor to sense the current in the resonant circuit. The voltage drop across the sensing resistor is applied to an operational amplifier and the amplified output voltage is fed back to the circuit loop out of phase with the sensed voltage drop so as to reduce the effective circuit resistance and thereby increase the circuit Q.