Using the Peng flap for a wide dorsal nasal defect

Reconstructions of large surgical defects of the central part of the nose pose a challenge for the surgeon due to its cosmetically prominent location. Treatment options include second intention healing, full‐thickness skin grafts and various local flaps. In the present case the “Peng flap” was used for the reconstruction of a 3.1 × 7 cm sized deep defect of the convex curve of the central nasal area in a 66‐year‐old woman. The Peng flap was performed as single‐stage procedure without complications. Good cosmetic outcome was provided by the use of adjacent skin from the lax perinasal area, the placement of the scar lines between facial cosmetic units, and the excellent tissue match for the sebaceous nasal skin. Considering the few complications of a single‐stage procedure associated with an excellent aesthetic outcome, the Peng flap should be considered not only as an effective choice for reconstruction of the cosmetically complex midline nasal tip but also the convex curve of the central nose.     

An Improved Integration Scheme for Mode-Coupling-Theory Equations

Within the mode-coupling theory (MCT) of the glass transition, we reconsider the numerical schemes to evaluate the MCT functional. Here we propose nonuniform discretizations of the wave number, in contrast to the standard equidistant grid, in order to decrease the number of grid points without losing accuracy. We discuss in detail how the integration scheme on the new grids has to be modified from standard Riemann integration. We benchmark our approach by solving the MCT equations numerically for mono-disperse hard disks and hard spheres and by computing the critical packing fraction and the nonergodicity parameters. Our results show that significant improvements in performance can be obtained employing a nonuniform grid.     

Differential effects of bifrontal tDCS on arousal and sleep duration in insomnia patients and healthy controls

Background

Arousal and sleep represent basic domains of behavior, and alterations are of high clinical importance.