Abstract: An aircraft includes wings having integrated ducted fans. The integrated ducted fans each have a duct with a stiffness ring. Each stiffness ring is made up of stiffness boxes and circular-arc-shaped ring segments. The stiffness boxes can include first stiffness boxes and second stiffness boxes, and the first stiffness boxes and second stiffness boxes differ in terms of height.

Abstract: A bonding wire according to the invention contains a core having a surface and a coating layer which is at least partially superimposed over the surface of the core. The core contains a core main component selected from copper and silver and the coating layer contains a coating component selected from palladium, platinum, gold, rhodium, ruthenium, osmium and iridium. The coating layer is applied on the surface of the core by depositing a film of a liquid containing a coating component precursor onto a wire core precursor and heating the deposited film to decompose the coating component precursor into a metallic phase.

Abstract: Noble metal preparations or lustre preparations which contain at least one polyaminoamide whose amino groups have preferably been inactivated, have a particularly advantageous stability in storage.