Abstract:
An electrical conductor assembly for use in switches, connectors, contactors, relays, and the like comprising a polymeric composition shell for substantially minimizing high current arc ignition and hot wire ignition, said composition shell comprising a poly(aryl ether) resin and an aromatic polycarbonate resin, and an electrical conductive metal core extending at least partially through said shell.
Abstract:
An electrical excitation circuit (10) for a gas laser. The electrical excitation circuit includes a charging circuit (16), connected in series with a pulse forming network (18) between a power source (12) and the laser load (14). The charging circuit (10) includes a capacitor charged by the power source (12) and a thyratron (S1) for transferring voltage to the pulse forming network (18). Alternatively, the charging circuit (10) includes a capacitor charged upon the firing of a silicon controlled rectifier (SCR1) through a saturable step-up transformer (XFMR1) which saturates for transferring voltage to the pulse forming network (18). The pulse forming network (18) includes a saturable inductor switch (S2) positioned with respect to a capacitor so that, when the voltage on the capacitor reaches a predetermined level, saturation on the saturable inductor switch (S2) releases electrical energy stored in the capacitor to the laser load (14). The saturable inductor switch (S2) is biaised by means of an electrical bias current which can be adjusted so that the saturable inductor switch (S2) saturates after the capacitor is fully charged, thereby controlling the time of application of the high voltage pulse to the laser load (14). The pulse forming network (18) preferably includes an additional capacitor and a magnetic diode charging inductor (L3) which is also biased by means of an electrical bias current. The capacitor is charged through the magnetic diode charging inductor (L3) and discharges in series with the other capacitor when the saturable inductor switch (S2) saturates, thereby doubling the voltage across the laser load (14) at the time of discharge. The magnetic diode charging inductor (L3) also minimizes prepulse across the laser load (14) during charging of the additional capacitor. Neither the saturable inductor switch (S2) nor the magnetic diode charging inductor (L3) are in the discharge loop (LD) with the laser load (14) thereby minimizing the inductance of the discharge loop (LD).
Abstract:
A select group of novel polyimides possessing excellent mechanical properties and thermal stability; the polyimides are also soluble in aprotic solvents and display the unique features of being miscible with aromatic poly(arylether ketones).
Abstract:
Novel bismaleimides and prepregable resin compositions comprising these bismaleimides and one or more liquid coreactants and optionally, one or more other additives. The novel bismaleimides, such as alpha, alpha-bis-(4-maleimido-phenyl)-meta-diisopropylbenzene, are characterized by the presence of three aromatic rings in the molecular structure and in some respects optimize the desirable characteristics of the one or two and four atomatic ring-containing bismaleimides in resins prepared therefrom.
Abstract:
Novel poly(aryl ether ketones) which display unique and outstand ing high temperature properties, a unique blending behavior and excellent fabricability characteristics.
Abstract:
A method of upgrading the area below a dispenser to contain accidental release harmful materials from contaminating the soil below grade without repiping, electrical changes, or concrete disruption.
Abstract:
A process is disclosed for the separation and recovery of an unsaturated hydrocarbon from its mixture with at least one other material by the selective and reversible complexation of the unsaturated hydrocarbon using a single cubane-type cluster of palladium, molybdenum and sulfur as a complexation agent.
Abstract:
The present invention relates to polyimides which are derived from at least one non-aromatic component, a process for their manufacture and their uses in electronic applications, particularly as dielectric coatings for printed wiring boards (PWBs), coatings for optical fibers, optical waveguides, gas separation membranes, and alignment layers for liquid crystal displays.
Abstract:
A solid, hydrocarbon-insoluble, olefin-polymerization catalyst component having substantially uniform particles useful in polymerizing olefins is formed by: reacting a magnesium-containing compound with carbon dioxide or sulfur dioxide; forming a two-phase mixture of the resulting magnesium-containing compound with a suitable liquid hydrocarbon-miscible phase and a suitable polar solvent phase; forming particles by adding the two-phase mixture after vigorous agitation to a liquid hydrocarbon; and contacting the formed particles at least once with a transition metal halide in the presence of an electron donor.