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The men's and women's championships have been held jointly since 1965. Following professionalization of the sport, the running of the national championships was taken over by The Athletics Congress of the USA (TAC) since 1980. TAC rebranded as USA Track & Field (USATF) in 1993. [1] [2] [3]
Tantalum carbides have metallic electrical conductivity, both in terms of its magnitude and temperature dependence. TaC is a superconductor with a relatively high transition temperature of T C = 10.35 K. [15] The magnetic properties of TaC x change from diamagnetic for x ≤ 0.9 to paramagnetic at larger x.
Plot of a NACA 2412 foil. The camber line is shown in red, and the thickness – or the symmetrical airfoil 0012 – is shown in purple. The simplest asymmetric foils are the NACA 4-digit series foils, which use the same formula as that used to generate the 00xx symmetric foils, but with the line of mean camber bent.
Shuttle hurdle relay (SHR) is a type of a relay race in track and field in which participants jump (sprint) over hurdles.The shuttle hurdle relay is contested at the Drake Relays, Desert Conference Relays, [1] Kansas Relays, Mt. SAC Relays, Penn Relays, Texas Relays, Akron Relays, Alabama Relay, Appalachian Conference Relay, Florida Relays (Gainesville), Knoxville Relay, Long Beach Relay, Ohio ...
Cadex Defence CDX-33 TAC Canada.338 Lapua Magnum [63] Haenel HLR 338 Germany.338 Lapua Magnum [47] Anti-materiel rifles; PTRD-41 Soviet Union: 14.5×114mm: Used in the counter-sniping role. [65] Snipex Alligator Ukraine: 14.5×114mm Used by special forces. [66] Snipex T-Rex Ukraine: 14.5×114mm Used by special forces. [66] MCR Horizon’s Lord ...
A foil generates lift primarily because of its shape and angle of attack. When oriented at a suitable angle, the foil deflects the oncoming fluid, resulting in a force on the foil in the direction opposite to the deflection. This force can be resolved into two components: lift and drag. This "turning" of the fluid in the vicinity of the foil ...
The following highways are numbered 880: United States. I-880. I-880 (former) I-880; SR 880; LA 880; MD 880 (former) PA 880; PR-880; FM 880; Preceded by 879: Lists of ...
Supercritical airfoils feature four main benefits: they have a higher drag-divergence Mach number, [21] they develop shock waves farther aft than traditional airfoils, [22] they greatly reduce shock-induced boundary layer separation, and their geometry allows more efficient wing design (e.g., a thicker wing and/or reduced wing sweep, each of which may allow a lighter wing).