Abstract: The invention relates to a method for protecting anode studs by coating the anode studs with an outermost surface layer of titanium diboride, zirconium diboride, titanium carbide, zirconium carbide, or mixtures thereof. The anode studs which are specifically to be protected in this instance are anode studs for electrolytic cells for the production of aluminum. The steel anode stud is conventionally subject to high corrosion rates due to the atmosphere in the aluminum furnace, and the industry has long sought means to protect this stud from corrosion without inhibiting electrical conductivity, while providing high temperature resistance to oxidation, and thermal shock resistance. It is also necessary that any coating applied to the steel anode stud be compatible with the carbon mass which is utilized as the anode per se. In accordance with the present invention, coatings of titanium diboride, zirconium diboride, titanium carbide, zirconium carbide, and mixtures thereof, have been found effective.

Abstract: A method of fabricating a diamond heat sink which includes the steps of metalizing a diamond, temporarily attaching the diamond to a base plate, electroplating the exposed surfaces of the diamond with at least a primary metallic layer to provide a metallic base, and separating the base plate from the diamond thereby leaving the diamond heat sink.

Abstract: A process for reducing high temperature oxidation of graphite electrodes for steel making by coating the electrodes with a siloxane fluid, such as dimethylpolysiloxane. Silicon carbide particles can be suspended in the siloxane fluid to improve coating characteristics.

Abstract: A composition for the preparation of concrete block, comprising aggregate, cement, and cement kiln dust.

Abstract: A hydraulic cement mix including hydraulic cement, aggregate, sufficient water to effect hydraulic setting of the cement, and an additive comprising a poly(hydroxyalkylated)polyethyleneamine or a poly(hydroxyethyl)polyethyleneimine or mixtures of each or both, the additive being present in an amount sufficient to increase the compressive strength of the hardened mix. Generally, the additive is present in a total amount of up to about 1.0% by weight based upon the weight of the cement, usually in an amount of between about 0.01% and about 0.25% by weight based upon the weight of the cement, preferably in an amount in the range of about 0.02% to about 0.07% by weight.

Abstract: An optical sight system having in combination: a sight assembly (10), including a stabilized mirror (12, 14), a laser designator (24), a laser ranger (26), a common optical system (16), a television optical system (20), and a television camera (22); a control panel (50), including manual control (52, 67, 79), range, azimuth and elevation readouts (75, 76, 77), electronic servo control circuits (56), and light level/field of view electronic control circuits (58); and display (60) including television tracker and video circuits (54). A target may be located manually and tracked automatically by television tracker circuits (54). Range to the target may be determined by laser ranger (26) and the target illuminated by a laser spot from laser designator (24) to permit use of guided ordnance to attack the target. The sight assembly (10) by virtue of integration of an optical bed (11) with the elements of the assembly is very lightweight to permit mounting on a mast (5) above the plane of a helicopter rotor.

Abstract: Gunning mixes and other magnesia-based refractory compositions are disclosed which include up about to 10% by weight sulfamic acid as a binder. Sulfamic acid reacts readily with periclase grain and, when employed with boric acid and ceramic sintering aids forms an excellent binder system.

Abstract: A hydraulic cement mix including hydraulic cement, aggregate, sufficient water to effect hydraulic setting of the cement, and an additive comprising a mixture of an alkali or alkaline earth or ammonium salt of thiocyanic acid, such as sodium, potassium, lithium, calcium or magnesium thiocyanate, and an alkanolamine, such as triethanolamine, the additive being present in an amount sufficient to increase rate of hardening, and the compressive strength of the hardened mix. Generally, the additive is present in a total amount of up to about 2.5% by weight based upon the weight of the cement, usually in an amount of between about 0.05% and about 2.55% by weight based upon the weight of the cement, preferably in an amount in the range of about 0.4% to about 0.6% by weight.

Abstract: Recovery of fluoride values from carbonaceous waste cathode materials is achieved by reacting the waste materials with oxygen, water, and sulfur dioxide at temperatures between about 600.degree. C. and 1200.degree. C.

Abstract: An anode assembly for a fused bath cell. The steel stud has an intermediate coating between it and the carbon anode body of a corrosion resistant material of titanium diboride, zirconium diboride, titanium carbide or zirconium carbide. The coating may contain molybdenum disilicide.

Abstract: A scan linearization device for use in a system that produces graphic images by means of nonlinear scanning elements which produce a multiplicity of scanning lines by scanning an array of emitters. The device introduces externally generated digitally coded signals representative of a desired image by quantizing a scanning line into a discrete number of periods and energizing appropriate emitters during each of such periods. An electrical scan waveform is picked off from the scanning elements and contains the nonlinearities. A staircase waveform is generated having equal amplitude steps and is compared to the scan waveform. When the amplitude of the scan waveform exceeds the amplitude of a step, the next step is generated resulting in a non-uniform temporal spacing of the amplitude steps complementary to the nonlinearities of the scan. The emitters are sequentially energized by each step such that the scan nonlinearities are compensated and an undistorted graphic image is produced.

Abstract: Apparatus having a high temperature probe and a low temperature probe, with each probe adapted to make thermal contact with a microelectronic device under test for sequentially heating the device first to a preselected high temperature and then cooling the device to a preselected low temperature. A control system is provided, connected to each of the probes by a small diameter, flexible cable. Each probe is a small, box-like structure having a heat sink as a base, a resistance heater attached to the heat sink, and a heat-sensing diode embedded in the heat sink. The control system senses the heat sink temperature and controls current through the heater to maintain the heat sink at a preselected temperature. The high temperature probe is placed on the top surface of a device under test and serves to add heat quickly thereto to bring the device to a preselected temperature above ambient.

Abstract: A method of storing energy at ambient temperature and recovering same at an elevated temperature which comprises decomposition of a chemical compound at high temperature with a second compound being used to form another product at low temperature. Upon regeneration of the decomposition product from the first compound there is a release of the originally absorbed high temperature thermal energy.

Abstract: A method of storing energy at ambient temperature and recovering same at an elevated temperature which comprises decomposition of a chemical compound at high temperature with a decomposition product being used to form another compound at low temperature. Upon regeneration of the decomposition product from the other compound there is a release of the originally absorbed high temperature thermal energy.

Abstract: This invention relates to a simplified pulse communication system for encrypting information to be transmitted over a communication link, which incorporates a novel randomizing and derandomizing procedure that is accomplished in the same step with PWM or PPM encoding and decoding.

Abstract: An emitting diffuser of electromagnetic radiation constructed as a three-dimensional body containing a reflective optical cavity. The cavity is coated with a highly reflective diffusion material over substantially its entire interior. The remaining interior surface is a transparent or translucent diffusion material forming a radiation exiting window, with the window geometry being selected to give a desired radiation pattern. The diffuser may receive energy from a laser source through an interconnecting light pipe, protecting near observers from the potentially eye damaging source emitted radiation. The light diffuser may be operated as a simulated target for laser-type target identification and tracking systems. A preferred embodiment of this invention is a hollow sphere in which the window is ring-shaped, and located substantially equidistant from the equatorial and upper polar region of the sphere.

Abstract: It has been found that hydration of aluminum oxide surface coatings to aluminum hydroxide may be curtailed by the presence of corrosion inhibiting amounts of amino phosphonate compounds. Effective inhibitors, such as nitrilotris (methylene) triphosphonic acid, may be applied to aluminum substrates having aluminum oxide surfaces thereupon in concentrations of less than 50% by weight in aqueous solution, and suitably from 1 to about 500 ppm.

Abstract: A beam of electromagnetic radiation is spatially encoded using a digital frequency diversity technique. The spatial encoding defines the beam cross-section into a series of resolution elements each identified by a different digital code. The codes defining resolution elements are detectable by an object, such as a missile, located in the radiation beam and can be used to locate the object in this beam. In the preferred embodiment, an encoding mask, moved through the beam, provides the digital frequency modulation. The mask is provided with a series of bit areas, each of which bears at least two sets of cyclically recurring bands effective to modulate a detectable parameter of the radiation, such as intensity. The spacing between adjacent bands of a set, termed a bit cycle, is proportional to a predetermined frequency of beam parameter modulation. The novel arrangement enables the object to identify its position within the beam under conditions of severe atmospheric turbulence and object induced perturbations.

Abstract: A composition and process for improving the curing of concrete, the composition comprising a Singapore dammar resin dissolved in an organic solvent. In a preferred embodiment of this invention, the resin-solvent solution is dispersed in a water-based emulsion by the use of an appropriate emulsifying agent. A preferred organic solvent is mineral spirits, and preferably the organic solvent contains a low enough level of photochemically reactive liquids to meet air pollution requirements such as Los Angeles Rule 66.

Abstract: Fire retardant properties are provided for cellulose insulation materials by the addition of a fire retardant composition comprising from 60 to 85% of bauxite, from 5 to 30% dolomite, and from 5 to 30% boric acid. Loading factors of from about 20 to about 35% fire retardant are effective to meet applicable federal specifications for flame spread and smoldering.