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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 ...
Ring (リング, Ringu) is a series of horror novels written by Koji Suzuki. The novels were initially a trilogy, consisting of Ring, Spiral, and Loop. A short story collection called Birthday was released shortly after, introducing extra stories interconnecting the trilogy. Two further books, S and Tide, were published in 2012 and 2013 ...
Formal power series. In mathematics, a formal series is an infinite sum that is considered independently from any notion of convergence, and can be manipulated with the usual algebraic operations on series (addition, subtraction, multiplication, division, partial sums, etc.). A formal power series is a special kind of formal series, whose terms ...
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 ...
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 .
Cohomology ring. In mathematics, specifically algebraic topology, the cohomology ring of a topological space X is a ring formed from the cohomology groups of X together with the cup product serving as the ring multiplication. Here 'cohomology' is usually understood as singular cohomology, but the ring structure is also present in other theories ...
As Biden's campaign tries to calm nervous Democrats, the DNC is circulating talking points that misleadingly suggest there is no means of replacing the president at the top of the party's ticket.