Abstract Optical mesh networks using intelligent optical cross-connects are the choice for the next generation optical core. Mesh networks can be designed for fast and guaranteed recovery from single failures and can be designed to protect traffic more efficiently via shared mesh restoration. In this paper, we present a mesh restoration architecture for the optical core. The architecture provid...

The undecenolide core of mycolactone was synthesized by ring-closing metathesis and the structure confirmed using single-crystal X-ray diffraction techniques.

High resolution DPIV measurements are made of a vortex ring formed by a piston/cylinder mechanism ~Reynolds number 3700 and 7500!. A complex ring structure is identified. The stopping condition of the piston leads to vortical fluid collecting near the forward stagnation point of the ring. In addition, the roll-up of the core produces a vorticity distribution that departs from a simple Gaussian ...

In the title compound, C26H22N2O, one phenyl ring, one five-membered N-heterocyclic ring and one six-membered carbocyclic ring make up the hexa-hydro-benzo[f]iso-indole core. Another phenyl group is attached to the heterocyclic N atom as a substituent. The non-aromatic five- and six-membered rings both exhibit boat conformations. In the crystal, weak C-H⋯O and C-H⋯N inter-actions establish the ...

let r be an associative ring with unity. an element a in r is said to be r-clean if a = e+r, where e is an idempotent and r is a regular (von neumann) element in r. if every element of r is r-clean, then r is called an r-clean ring. in this paper, we prove that the concepts of clean ring and r-clean ring are equivalent for abelian rings. further we prove that if 0 and 1 are the only idempotents...