fibre-reinforced plastic is a composite material made of a polymer matrix reinforced with fibres. the fibres are usually glass, carbon, aramid, or basalt. rarely, other fibres such as paper, wood, or asbestos have been used. the polymer is usually an epoxy, vinyl ester, or polyester thermosetting plastic, though phenol formaldehyde resins are still in use. frps are commonly used in the aerospace, automotive, marine, and construction industries. they are commonly found in ballistic WPC as well.
natural graphite is derived from mining. the quality of natural graphite varies as a result of the ore quality and its post-mining processing. the end product is graphite with a content of carbon high grade graphite 96−98% carbon , sulfur, sio 2, and ash. the higher the carbon content and the degree of graphitization high crystalline the better the lubricity and resistance to oxidation.
the angle of repose, or critical angle of repose, of a granular material is the steepest angle of descent or dip relative to the horizontal plane to which a material can be piled without slumping. at this angle, the material on the slope face is on the verge of sliding. the angle of repose can range from 0 to 90 .
a spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark. spark-gap transmitters were the first type of radio transmitter, and were the main type used during the wireless telegraphy or 'spark' era, the first three decades of radio, from 1887 to the end of world war i. german physicist heinrich hertz built the first experimental .
a thermocouple is an electrical device consisting of two dissimilar electrical conductors forming an electrical junction.a thermocouple produces a temperature-dependent voltage as a result of the thermoelectric effect, and this voltage can be interpreted to measure temperature.thermocouples are a widely used type of temperature sensor.. commercial thermocouples are inexpensive, interchangeable .
sodium silicate was used to seal combustible nitrated paper together to form a conical paper cartridge to hold the black powder, as well as to cement the lead ball or conical bullet into the open end of the paper cartridge. such sodium silicate cemented paper cartridges were inserted into the cylinders of revolvers, thereby speeding the .
fibre-reinforced plastic frp also called fiber-reinforced polymer, or fiber-reinforced plastic is a composite material made of a polymer matrix reinforced with fibres.the fibres are usually glass in fibreglass , carbon in carbon fiber reinforced polymer , aramid, or basalt.rarely, other fibres such as paper, wood, or asbestos have been used. the polymer is usually an epoxy, vinyl ester .
introduction. a corona discharge is a process by which a current flows from an electrode with a high potential into a neutral fluid, usually air, by ionizing that fluid so as to create a region of plasma around the electrode. the ions generated eventually pass the charge to nearby areas of lower potential, or recombine to form neutral gas molecules.. when the potential gradient electric field .
indium alloys are used for cryogenic applications, and for soldering gold as gold dissolves in indium much less than in tin. indium can also solder many nonmetals e.g. glass, mica, alumina, magnesia, titania, zirconia, porcelain, brick, concrete, and marble . prone to diffusion into semiconductors and cause undesired doping.
wet tantalum electrolytic capacitors wet slug lowest leakage among electrolytics. voltage up to 630 v tantalum film or 125 v tantalum sinter body . voltage up to 630 v tantalum film or 125 v tantalum sinter body .