174 results about "Epoxy matrix" patented technology

A tire assembly with integrated power generation features includes one or more piezoelectric devices and power conditioning modules. Piezoelectric devices may include a plurality of piezoelectric fibers embedded in a generally unidirectional fashion within an epoxy matrix, a piezoceramic wafer provided on a substrate and substantially surrounded by a protective casing, or a piezoceramic unimorph structure adhered with a thermoplastic polyimide to respective top and bottom conductive layers. Each piezoelectric device may include multiple piezoelectric elements connected in series and / or parallel arrangements, configured with respective poling directions in opposing or in-phase arrangements and / or configured in d33 or d31 displacement modes. Piezoelectric devices are preferably mounted within a tire or wheel assembly such that electric charge is generated therein as the wheel assembly moves along a ground surface and is subsequently stored in one or more energy storage devices. Stored energy may then be used to power electronics such as a tire monitoring system that wirelessly transmits such information as tire pressure, temperature and identification variables to a remote receiver location.

An avionics chassis comprises a housing having a substantially thermally non-conductive frame comprising a composite of carbon fibers laid up in an epoxy matrix. The housing also includes at least two walls, at least one of which is a thermally conductive wall comprising a composite of carbon fibers in a carbonized matrix, and a plurality of spaced, thermally-conductive, card rails provided on the at least two walls. The at least two walls are mounted to the frame in opposing relationship such that corresponding card rails on the walls define an effective slot therebetween in which a printed circuit board may be received and the card rails and the at least one thermally conductive wall form a thermally conductive path from the interior to the exterior.

Cast collimators for use in CT imaging systems are described, as are methods of making them. Such collimators may comprise pre-patient collimators, pre-patient filter / collimator assemblies, and / or post-patient collimators. The filters and / or collimators may be made of any suitable high-density, high atomic number material such as lead, a lead alloy, tantalum, tungsten, tungsten suspended in an epoxy matrix, tungsten suspended in a slurry, or the like. Embodiments of these collimators comprise specially-designed channels and vanes that allow them to be precision cast to the necessary degree of accuracy. These channels and vanes are preferably tapered. These collimators and filter / collimator assemblies help minimize the x-ray dose to the patient by minimizing the scattered radiation creation mechanism and by collimating out much of the scattered radiation that would otherwise be subjected to the patient. These collimators may be cast as either single piece structures, or multiple pieces that can be operatively connected together.

The present invention provides a turbofan engine including leading edge erosion protection for composite stator vanes contained therein. The composite stator vanes are defined by a leading edge, a trailing edge, a concave surface and a convex surface. The vanes are generally formed of a graphite fiber and an aramid fiber braided preform that is laminated with an epoxy matrix resin or other high temperature matrix resin. A wire mesh screen is embedded during a molding process into an outermost surface of the leading edge of the epoxy matrix resin. A tapering erosion protection layer comprised of an erosion protective material is applied to the wire mesh screen at the leading edge of the composite stator vane an aids in protecting the leading edge of the stator vane from debris and contaminants, including operational fluids, dust, and sand that may be carried in an air stream passing therethrough the turbofan engine, as well as an erosive operational environment.