Abstract: 2. Combined layers in a microwave radiation absorber comprising a layer of ielectric material of relatively high dielectric constant and a layer of magnetic material having a relatively high coefficient of magnetic permeability, said layers being substantially parallel and contiguous to one another and adapted to be positioned at a radiation reflecting surface, said layer of magnetic material being adapted to be contiguous to said reflecting surface, said layers having a thickness approximately a quarter wavelength of microwave radiation as measured within said combined layers.

Abstract: A method of determining thermal constants of bonding layers of an infrared ensor which comprises cooling a bonded layer sensor to 77.degree.K and then heating the sensor by a quick pulse of heat. The electrical resistance of the sensor is measured and the measurement continued to determine a thermal profile. The measured thermal profile is compared with a known profile to determine thickness of the bonding layers and the material layers.

Abstract: Preparation of titanium tetraperchlorate, vanadium perchlorate, and chromyl erchlorate by the reactions of chlorine perchlorate with the respective anhydrous metal chlorides at a temperature from about -45.degree. C to about 20.degree. C. These perchlorates are useful in compounding gas generating compositions.

Abstract: A method of compounding graphitizable compositions and improving the dispersion of filler particles and binder which comprises introducing the carbon filler into a hot-shear mixer, adding from about 25 to about 70 pph of water, adding from about 1/4 to about 5 pph of a dispersant, mixing for about 1/2 hour at a temperature at least above the boiling point of water (100.degree.), adding a binder, and mixing for about an additional one hour at a temperature above the melting point of the binder.

Abstract: A system for determining the focus point of a high power radiation beam.

Abstract: Solar energy is collected and recoverable in a central place as high temperature heat. The heat is delivered to a large reservoir of salt, thereby raising the temperature of the salt and melting the salt solids. The salt reservoir provides an energy reservoir from which heat is withdrawn for chemical processing. The heat withdrawn from the salt heats the oil shale for the production of gases without the process of combustion burning.

Abstract: 1. A radio pulse signalling system comprising, in combination:Means for generating a first time base consisting of a finite number of regularly time-spaced pulse signals;First means for forming a pulse code group from said time base signal in accordance with a preselected pattern, said pulse code group always including an initial starting pulse;Means for transmitting a pulsed radio wave corresponding to said pulse code group;Means for receiving said pulsed radio wave at a remote point;Means, actuated by the initial starting pulse in said received wave, for generating a second time base corresponding to said first time base; andSecond means for forming a pulse code group corresponding to the transmitted pulse code group from said second time base signal.

Abstract: 1. In a signal jamming device, first and second transducers physically displaced relative to each other said transducers having substantially identical signal coupling characteristics on the basis of direction to a selected distant object, means for coupling said transducers whereby signals received by one transducer are emitted by the other and vice versa, and differential impedance means connected to said means for coupling for producing phase shift of signals emitted by one transducer relative to signals emitted by the other transducer.

Abstract: Method and apparatus for Langmuir probe plasma diagnostics employing an etronically controlled, discontinuous, modulated sweep of pulses in which the pulse amplitude follows a sawtooth envelope. The pulse organization procedure is such that the probe rests at a baseline potential for a period which is much longer than the pulse width and current-voltage data points are generated by each pulse. The distortions that can result when probe surface conditions change within the measurement period are eliminated by maintaining a single probe surface condition throughout the collection period of the current-voltage characteristic.

Abstract: An electrically variable surface acoustic wave phase shifter including a strate upon which a piezoelectric layer is deposited and separated therefrom by an insulating layer. An electrode is deposited on the piezoelectric layer and on the bottom of the substrate with an electrical dc bias applied onto the electrodes which causes a charge accumulation or a depletion region at the silicon surface. This charge accumulation or depletion region causes the boundary conditions to change therefore causing a phase change in an acoustical wave propagating along the layered silicon surface.

Abstract: A capacitance-type transducer used for the measurement of bending strains test elements which are not sufficiently strong to support a strain element or for test elements in which a strain element would strengthen the test element and not give an accurate test. The transducer is formed by a spring wire which has a portion perpendicular to the test specimen with a U-shaped end extending from the perpendicular portion. One portion of the U-bend has an insulator about the wire where the insulator parallels the test specimen surface and is in contact therewith. The end of the wire has a flat conductive plate secured thereto with the flat plate parallel with the specimen. The spacing between the flat plate and the specimen forms the capacitance spacing which changes as the specimen is strained in a direction perpendicular to the flat plate. The distance between the flat plate and specimen is represented by a change in capacitance which is measured by an oscilloscope.

Abstract: The adduct of a cyclophosphonitrilic chloride (PNCl.sub.2).sub.3 and hexahylphosphoramide (Me.sub.2 N).sub.3 PO when reacted with an alcohol yields a reaction product that is useful as an additive to general purpose polyester resins enhancing the resin's fire retardant characteristics.

Abstract: A multiterminal single mode communication system using single mode fibers d a single centrally located laser source. An electro-optical switch at the terminal switches pulses of light from the communication channel to a distribution channel comprising a single mode fiber. Information is switched on by an electrical modulator which controls the light switching of the switches and information is taken off by light detectors.

Abstract: A multifilament composite superconductor which comprises (1) a matrix she selected from the group consisting of a copper-gallium (Cu--Ga) alloy with a gallium content from 0.4 to 22 at.%, a copper-tin (Cu--Sn) alloy with a tin content from 1 to 11 at. %, and a copper-silicon (Cu--Si) alloy with a silicon content from 0.5 to 14 at. %; (2) multiple filaments embedded in said encasing matrix sheath and selected from the class consisting of a vanadium -gallium (V--Ga) alloy with a gallium content from 0.4 at. % to 12.5 at. %, a niobium-tin (Nb--Sn) alloy with a tin content from 0.1 at. % to 12.0 at. %, and vanadium-silicon (V--Si) alloy with a silicon content from 0.5 to 10 at. %; and (3) a continuous interfacial layer between said matrix and each filament of an A-15 compound selected from the class consisting of V.sub.3 Ga, Nb.sub.3 Sn, and V.sub.3 Si.

Abstract: A reply simulator for generating binary 1's and 0's representative of "frd" and "non-friend" replies received by an IFF system. Simulated replies are produced in a probabilistic fashion which takes into account variation in a simulated received signal caused by simulated antenna pattern and antenna direction variations, as well as by the probability that a "non-friend" will produce a "friend" reply.

Abstract: A reservoir of salt eutectic which includes a plurality of heat pipes in the bottom through which a hot gas passes, and pipes near the top through which water passes and is converted to steam. Means is provided for scraping the salt from the pipes so that the pipes will give off sufficient heat.

Abstract: A method and system for measuring small gain or losses in a laser cavity. The method includes placing a sample in a cell in a two beam system in which one beam polarized in one direction passes through the cell while the other beam of different polarization does not pass through the cell. The ratio of the two polarizations with the sample in and out of the cell in the system determines a measure of the effect of the sample on the system. The ratios are measured with the sample cell empty and then with the sample in the cell.

Abstract: Devices exhibiting negative-resistance characteristics are adjusted and irconnected to form a composite device in a manner to permit negative-resistance regions of each device to cooperatively interact to provide additional stable states in excess of the number of stable states exhibited by the composite device not operating in a negative-resistance interactive mode. A minimum number of (M+1)+[(M-1)!] stable states can be achieved by combining M negative-resistance devices to operate in an interactive manner.

Abstract: N,N'-bis(3,4-dicyanophenyl) alkanediamides of the general formula: ##SPC1##Wherein R = (CH.sub.2).sub.n.sub.-2 and (CH.sub.2).sub.x CH(CH.sub.3)(CH.sub. 2).sub.y ; n = 3 to 20; x = 1 to 8; and y = 1 to 8, prepared by reacting 4-aminophthalonitrile with a saturated aliphatic dicarboxylic acid halide. These dinitriles readily polymerize through heating by themselves or with a metal or with a salt to form polyphthalocyanine resins, of the infinite molecular weight type which are useful as coatings, laminates, adhesives, filament windings, and castings. The general formulas for these polyphthalocyanine resins are: ##SPC2## ##SPC3##Wherein R = (CH.sub.2).sub.n.sub.-2 and (CH.sub.2).sub.x CH(CH.sub.3)(CH.sub.2).sub.y ; n = 3 to 20; x = 1 to 8; and y = 1 to 8.

Abstract: Frequency and other characteristics of energy contained in a region of the lectromagnetic or acoustic spectrum under examination is determined by subdividing the region, examining each subdivision for energy content, and then further subdividing and examining those subdivisions exceeding a threshold energy. This process is continued until the bandwidth of the last subdivision is equal to the desired frequency resolution.