An electrical device includes an electrical component configured to generate heat during operation of the electrical device. A thermal management coating is configured to transfer heat from the electrical component by thermal conduction. The thermal management coating comprises a non-carbon based topological insulator.

Provided is a method of manufacturing a downhole cable, the method including, forming a helical shape in an outer circumferential surface of a metal tube, the metal tube having a fiber element housed therein, and stranding a copper element in a helical space formed by the metallic tube. Also provided is a downhole cable including, a metallic tube having a helical space in an outer circumferential surface thereof, wherein the metallic tube has a fiber element housed therein, and a copper element disposed in a helical space formed by the steel tube. Double-tube and multi-tube configurations of the downhole cable are also provided.

A method of forming a metal-graphene composite includes coating metal components (10) with graphene (14) to form graphene-coated metal components, combining a plurality of the graphene-coated metal components to form a precursor workpiece (26), and working the precursor workpiece (26) into a bulk form (30) to form the metal-graphene composite. A metal-graphene composite includes graphene (14) in a metal matrix wherein the graphene (14) is single-atomic layer or multi-layer graphene (14) distributed throughout the metal matrix and primarily (but not exclusively) oriented with a plane horizontal to an axial direction of the metal-graphene composite.

There are provided an inexpensive sheet material of a copper alloy having an excellent bending workability and an excellent stress corrosion cracking resistance while maintaining a high strength, and a method for producing the same. The sheet material of the copper alloy is produced by a method comprising the steps of: melting and casting raw materials of a copper alloy which has a chemical composition comprising 17 to 32% by weight of zinc, 0.1 to 4.5% by weight of tin, 0.01 to 2.0% by weight of silicon, 0.01 to 5.0% by weight of nickel, and the balance being copper and unavoidable impurities; hot-rolling the cast copper alloy in a temperature range of from 900 C. to 400 C.; cooling the hot-rolled copper alloy at a cooling rate of 1 to 15 C./min. from 400 C. to 300 C.; cold-rolling the cooled copper alloy; recrystallization-annealing the cold-rolled copper alloy at a temperature of 300 to 800 C.; and then, ageing-annealing the recrystallization-annealed copper alloy at a temperature of 300 to 600 C.

Provided are a copper alloy for electric and electronic devices, a copper alloy sheet for electric and electronic devices, a component for electric and electronic devices, a terminal, and a bus bar. The copper alloy for electric and electronic devices includes, as a composition: 0.01 mass % or higher and lower than 0.11 mass % of Zr; 0.002 mass % or higher and lower than 0.03 mass % of Si; and a balance including Cu and unavoidable impurities, in which a ratio Zr/Si of the Zr content (mass %) to the Si content (mass %) is within a range of 2 to 30.

A terminal is crimped to a portion where a plurality of metal strands are welded. A conductive member is configured by a plurality of coated metal wires provided with a plurality of metal strands and with an electrically conductive sheath covering a circumference of each of the plurality of metal strands. The conductive member includes a welded portion, in which at least a portion in an extension direction of the plurality of coated metal wires is welded, and the welded portion includes an outer layer that is formed on an outer circumference side by welding the plurality of coated metal wires together, and at least a portion of the plurality of coated metal wires on an inner side of the outer layer is capable of untwining due to crimping a terminal.

A structure includes a high-strength nanowire core with a first electrically-conductive metal layer bonded to an outer surface thereof. An insulating layer is bonded to an outer surface of the first electrically-conductive metal layer, and a second electrically-conductive metal layer is bonded to an outer surface of the insulating layer. The nanowires are braided into a litz bundle, which reduces electrical losses during transmission of high-frequency current.

Described is a composition suitable for the preparation of an electroconductive transparent layer, said composition comprising silver nanowires and fibers of crystalline cellulose.

An inductive sensor includes a core body, a coil wound on the core body, a cavity having a fixed volume within the core body, and an epoxy mixture filling a controlled portion of the fixed volume. The controlled portion of the fixed volume filled with the epoxy mixture controls an inductance of the sensor.

A connector terminal wire contains 0.1% by mass or more and 1.5% by mass or less of Fe, 0.02% by mass or more and 0.7% by mass or less of P, and 0% by mass or more and 0.7% by mass or less, in total, of at least one of Sn and Mg, with the balance being Cu and impurities.