Abstract: A screen structure comprising: at least one support element comprising a bistable extendable member; a panel element attached to the at least one support element and comprising a leading edge, wherein the at least one support element and the panel element are configured to be rollable about a first longitudinal axis, to provide for extension and retraction thereof along a direction generally perpendicular to the first longitudinal axis between a first fully extended position and a second position where the at least one support element and the panel element are at least partially retracted; a handle element for extending and retracting the support element and the panel element upon application of a force to the handle element; and characterised by: at least one spacer element configured so that when the at least one support element and the panel element are in the second position, the leading edge of the panel element is substantially parallel with the first longitudinal axis.

Abstract: A screen structure comprises at least one support element comprising a bistable extendable member; a panel element attached to the at least one support element, wherein the at least one support element and the panel element are configured to be rollable about a first longitudinal axis, to provide for extension and retraction thereof along a direction generally perpendicular to the first longitudinal axis; a handle element for extending and retracting the at least one support element and the panel element upon application of a force to the handle element, wherein when the at least one support element and the panel element are substantially fully retracted, the handle element is arrangeable in one or more first positions and in a parked position; and at least one guide element comprising a curved or angled portion which the handle element is configured to bear against and move relative to, to guide the handle element from the one or more first positions to the parked position.

Abstract: Improved photocatalysis is provided for chemical reactions involving hydrogen in two component plasmon-catalyst nanoparticles. The main idea of this work is to configure the optical illumination of the nano-articles to suppress formation of an undesirable hydride phase in the nanoparticles. This idea is broadly applicable to any chemical reaction involving hydrogen. Specific examples considered experimentally in this work are acetylene hydrogenation to produce ethylene, carbon dioxide reduction and ammonia synthesis.