Generally, the present disclosure provides example embodiments relating to a printed circuit board (PCB). In an embodiment, a structure includes a PCB including insulating layers with respective metal layers being disposed therebetween. Each of first layers of the insulating layers includes a first fiberglass content. A second layer of the insulating layers has a second fiberglass content less than the first fiberglass content. For example, in some embodiments, the second insulating layer does not include a fiberglass matrix.

A silica nanofiber material includes a flexible mat comprising a plurality of silica nanofibers. An electrical device may include an electrical component and the silica nanofiber material disposed over the electrical component. A method of forming a silica nanofiber material includes electrospinning a fluid comprising a silica precursor and a polymer to form electrospun fibers, removing at least a portion of the polymer from the electrospun fibers to form silica nanofibers, and annealing the silica nanofibers to bind the silica nanofibers together.

A join is provided that has an electrically insulating component and two joining partners secured to one another and electrically insulated from one another by the electrically insulating component. The electrically insulating component has a surface that extends between the two joining partners. The surface defines a structure selected from a group consisting of an elevation, a depression, and any combinations thereof. The structure elongates a direct path along the surface. The structure completely surrounds at least one of the two joining partners. The electrically insulating component and/or the structure includes a glass that is at least partially crystallized.

A lead-through or connecting element is provided that includes an assembly having a carrier body of a high-temperature alloy, a functional element, and an at least partially crystallized glass. The crystallized glass is between a portion of the functional element and a portion of the carrier body. The carrier body subjects the crystallized glass to a compressive stress of greater than or equal to zero, at a temperature from at least 20 C. to more than 450 C. Also provided are a method for producing a lead-through or connecting element, the use of such a lead-through or connecting element, and to a measuring device including such a lead-through or connecting element.

There is described an electrical isolator comprising a first fluid-carrying member and a second fluid-carrying member spaced apart from said first fluid-carrying member, a resistive, semi-conductive or non-conductive component located between and sealed against said first and second fluid-carrying member, wherein said resistive, semi-conductive or non-conductive component is adapted to convey fluid flowing from said first fluid-carrying member to said second fluid-carrying member, a reinforcing composite encircling said first fluid-carrying member, said second fluid-carrying member and said resistive, semi-conductive or non-conductive component, wherein said reinforcing composite is continuous and provides a conductive path between said first fluid-carrying member and said second fluid-carrying member, wherein said reinforcing composite comprises fibre and a resin mixture, and said resin mixture comprises resin and a conductive additive.

There is described an electrical isolator comprising a first fluid-carrying member and a second fluid-carrying member spaced apart from said first fluid-carrying member, a resistive, semi-conductive or non-conductive component located between and sealed against said first and second fluid-carrying member, wherein said resistive, semi-conductive or non-conductive component is adapted to convey fluid flowing from said first fluid-carrying member to said second fluid-carrying member, a reinforcing composite encircling said first fluid-carrying member, said second fluid-carrying member and said resistive, semi-conductive or non-conductive component, wherein said reinforcing composite is continuous and provides a conductive path between said first fluid-carrying member and said second fluid-carrying member, wherein said reinforcing composite comprises fibre and a resin mixture, and said resin mixture comprises resin and a conductive additive.

Refractory composite material based on Al.sub.2O.sub.3 in the form of corundum, SiO.sub.2 in the form of quartz and sodium aluminate having the formula NaAl.sub.11O.sub.17 or Na.sub.2O 11Al.sub.2O.sub.3, method for preparing the same, use thereof for preparing manufactured items, as well as manufactured items made thereby and use thereof.

Refractory composite material based on Al.sub.2O.sub.3 in the form of corundum, SiO.sub.2 in the form of quartz and sodium aluminate having the formula NaAl.sub.11O.sub.17 or Na.sub.2O 11Al.sub.2O.sub.3, method for preparing the same, use thereof for preparing manufactured items, as well as manufactured items made thereby and use thereof.

Systems, methods and tools for the interrogation of fiber-reinforced composite strength members to assess the structural integrity of the strength members. The systems and methods utilize the transmission of light through optical fibers that are embedded along the length of the strength members. The inability to detect light through one or more of the optical fibers may be an indication that the structural integrity of the A strength member is compromised. The systems and methods may be implemented without great difficulty and may be implemented at any time in the life cycle of the strength member, from production through installation. The systems and methods have particular applicability to bare overhead electrical cables that include a fiber-reinforced strength member.

Systems, methods and tools for the interrogation of fiber-reinforced composite strength members to assess the structural integrity of the strength members. The systems and methods utilize the transmission of light through optical fibers that are embedded along the length of the strength members. The inability to detect light through one or more of the optical fibers may be an indication that the structural integrity of the A strength member is compromised. The systems and methods may be implemented without great difficulty and may be implemented at any time in the life cycle of the strength member, from production through installation. The systems and methods have particular applicability to bare overhead electrical cables that include a fiber-reinforced strength member.