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The 3-ring release system is a parachute component that is widely used by sport skydivers and military freefall parachutists to attach the two risers of a main parachute to the harness that bears the load under the parachute. Invented in its original large ring form by Bill Booth, [1] and subsequently scaled down for thinner Type 17 webbing ...
A vortex ring, also called a toroidal vortex, is a torus -shaped vortex in a fluid; that is, a region where the fluid mostly spins around an imaginary axis line that forms a closed loop. The dominant flow in a vortex ring is said to be toroidal, more precisely poloidal. [clarification needed] Vortex rings are plentiful in turbulent flows of ...
The antenna system of a typical air traffic control radar, the ASR-9. The curved reflector antenna on the bottom is the primary surveillance radar (PSR), and the flat antenna on top of it is the secondary surveillance radar (SSR). In operation the antenna rotates about a vertical axis, sweeping a vertical fan-shaped beam of microwaves around the local airspace to locate and track aircraft.
Ring system. The moons Prometheus (right) and Pandora (left) orbit just inside and outside, respectively, the F ring of Saturn, but only Prometheus is thought to function as a shepherd moon. A ring system is a disc or torus orbiting an astronomical object that is composed of solid material such as gas, dust, meteoroids, planetoids or moonlets ...
Ring-opening polymerization. A polymerization in which a cyclic monomer yields a monomeric unit which is acyclic or contains fewer cycles than the monomer. Note: If monomer is polycyclic, the opening of a single ring is sufficient to classify the reaction as ring-opening polymerization. Modified from the earlier definition.
When customers sign a solar lease or power purchase agreement (PPA), the solar company agrees to cover the cost of the panel removal when the lease is up, usually after 20 years. But big companies ...
Polynomial ring. In mathematics, especially in the field of algebra, a polynomial ring or polynomial algebra is a ring (which is also a commutative algebra) formed from the set of polynomials in one or more indeterminates (traditionally also called variables) with coefficients in another ring, often a field .
Conversely, any commutative ring with derivation has a canonical vertex algebra structure, where we set , so that restricts to a map which is the multiplication map with the algebra product. If the derivation vanishes, we may set to obtain a vertex operator algebra concentrated in degree zero. Any finite-dimensional vertex algebra is commutative.
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