Abstract: A mirror for a microlithographic projection exposure apparatus, and a method for operating a deformable mirror. In one aspect, a mirror includes an optical effective surface (11), a mirror substrate (12), a reflection layer stack (21) for reflecting electromagnetic radiation incident on the optical effective surface, and at least one piezoelectric layer (16) arranged between the mirror substrate and the reflection layer stack and to which an electric field for producing a locally variable deformation is able to be applied by a first electrode arrangement situated on the side of the piezoelectric layer (16) facing the reflection layer stack, and by a second electrode arrangement situated on the side of the piezoelectric layer facing the mirror substrate. The piezoelectric layer has a plurality of columns spatially separated from one another by column boundaries, wherein a mean column diameter of the columns is in the range of 0.1 ?m to 50 ?m.

Abstract: A system and method for providing resident-managed guest access to a residential community selectively accessible through an access gate provides an application running on wireless mobile devices of a respective community resident, guest of the resident, and a security guard manning a community access gate. A request for admission may be initiated by the guest via the guest's mobile device and communicated to the resident's mobile device via a pass-based remote access control management system. An access request response generated by the resident via the resident's mobile device and communicated to the remote access control management system generates a digital access pass including, inter alia, a readable unique QR code and a digital image of a guest photo ID. A security guard may scan the QR code and view the guest photo ID digital image in order to verify admission of the guest.