Abstract: An equilibration method is provided for modifying aromatic polycarbonates with monohydricphenol or dihydricphenol. Polycarbonate modification can be achieved under ambient conditions or at elevated conditions based on the use of a tertiary amine catalyst and an organic solvent.

Abstract: A high temperature oxidation resistant dispersion strengthened nickel-chromium alloy body is described. The alloy body comprises a first coating of metallic cobalt and a second coating of aluminum.

Abstract: A semiconductor body heater is provided with a planar array of radiant heating elements spaced from a reflector. In the preferred embodiment, each radiant heating element comprises a tungsten filament quartz lamp. Each lamp is removable and replaceable without disengaging any other lamp. The reflector is cooled by flows of gas and liquid coolant therethrough. Flows of gas between the planar array of lamps and the reflector and between the reflector and a cover member also cool the apparatus. Various diffusers for substantially eliminating temperature nonuniformities over an area illumined by the planar array of lamps are also disclosed. The semiconductor body heater of the present invention is particularly well suited for use in a temperature gradient zone melting process.

Abstract: Dihydrooxadiazinones are provided which can be used as blowing agents in various thermoplastic polymeric materials to produce high performance thermoplastic foams. A ketone having at least one .alpha.-hydrogen atom is halogenated and hydroxylated to produce an .alpha.-hydroxyketone. Condensation of the .alpha.-hydroxyketone with an organocarbazate produces the corresponding carboorganooxyhydrazone which is cyclized to a dihydrooxadiazinone.

Abstract: 1,1,1-Trichloro-2,2-bis(4-hydroxyphenyl)ethane can be dehydrohalogenated to 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene by treating the former with liquid ammonia.

Abstract: Foamable blends are provided of high performance thermoplastic polymers such as polycarbonates, polyesters, etc., and an effective amount of a dihydrooxadiazinone blowing agent. The blends can be melt extruded into pellets and sheet and converted into thermoplastic foam structures in accordance with conventional injection molding techniques.

Abstract: A ceramic suitable for use in the casting of advanced superalloy materials has a structure including a predetermined porosity content and a material microstructure characterized by a high density of microcracks.

Abstract: Rupture of boiling water reactor nuclear fuel cladding resulting from embrittlement caused by fission product cadmium is prevented by adding the stoichiometrically equivalent amount of gold, silver or palladium to the fuel.

Abstract: Deep diodes which extend in straight lines through a silicon wafer are produced by migrating aluminum droplets through the wafer while maintaining a finite temperature gradient through the wafer in the direction of straight line droplet travel, and at the same time maintaining a zero temperature gradient through the wafer in a direction normal to the droplet travel course. Unidirectional heat flow apparatus implementing this method is also disclosed.

Abstract: By providing a nickel or copper overcoat to a tin coating on a niobium-copper multifilamentary composite wire, one can avoid the necessity for choosing between poor superconducting properties due to tin droplet formation and substantially increasing production costs by adding a number of special processing steps.

Abstract: The stress corrosion tendency of a welded pipe in service in a nuclear reactor water line is reduced by applying to the outside of the pipe a secondary weld bridging the primary weld of the joint beyond the axial extremities of the primary weld heat affected zone and particularly that part of the zone at the inner surface of the pipe.

Abstract: When an aluminum-rich droplet is migrated along the [100] axis of a silicon crystal during a thermal gradient zone melting operation, a droplet is displaced appreciably from its thermal trajectory by dislocations it encounters in the crystal. This random walk of the droplet is minimized to enable preservation of the registry of deep diode arrays by maintaining a unidirectional thermal gradient a few degrees off the [100] axis.

Abstract: This in vivo sensor assembly, consisting of a sensing electrode and an insertion catheter, is capable of calibration and recalibration in situ without blood sampling because the sensing electrode can be retracted into its insertion catheter where it can be contacted with calibrating solution furnished by a drip line in which the reference electrode also contacts the calibrating solution.

Abstract: Delivery of a test specimen vapor--carrier gas mixture into a gas chromatograph is accomplished by means of an apparatus including a barrel to receive a probe which serves to maintain the test specimen in contact with carrier gas within the barrel, a heating coil disposed around portions of the barrel housing the sample, and a compression seal releasably bearing against a portion of the probe to prevent air flow into and gas flow from the open end of the barrel.

Abstract: An antifoam composition is introduced as an aerosol into the main gas stream entering a gas-liquid separation tower. The main gas stream carries the small aerosol particles up the tower through the sieve-like separation trays and the water moving over the plurality of trays. The movement of the antifoam carried in the gas stream to the top of the tower is many times more rapid than the transit of liquid down the tower in countercurrent movement thereto. For antifoam particle sizes in the preferred range, movement of the antifoam continues unabated through a long series of trays in the tower to effectively inhibit foam formation therein.

Abstract: An annular composite joint of wire and braze alloy fluid-tightly seals the bucket of a gas turbine to the root sidewall piece bridging the space provided between the two parts to eliminate the necessity for close tolerance fit.

Abstract: An in vivo specific ion sensor contains a specific ion electrode and surrounding reference half cell which has its immobilized electrolyte adjacent to and spaced from the specific ion electrode. The specific ion sensor is introduced, for example, into the blood stream by passing it through a cannula which perforates the subject's tissue and the underlying wall of the blood vessel.

Abstract: Silicon-iron sheet products of excellent magnetic properties can be produced by providing a hot-rolled band containing a small but critical amount of boron in critical proportion to the nitrogen content of the metal in which the manganese to sulfur ratio is less than 1.8, cold rolling the band directly to final thickness, and then heat treating the cold-rolled product to cause secondary recrystallization.

Abstract: A photoflash unit is designed to have a plurality of lamps fired individually and in sequence includes a plurality of switching devices capable of being easily activated by radiant energy generated during flashing of the lamps. Initially, the switches have a high resistance ("off" position) and after being activated by radiation, they undergo a chemical change to a conductive state ("on" position). The switches are prepared from compositions which impart improved shelf life under conditions of high relative humidity and include a light absorbing, heat transmitting protective coating having absorption characteristics in the range of 3000-5500 A.