We wanted to congratulate Ng et al.1 for describing an effective lenticular hydration technique for identification and extraction of a lenticular remnant after small incision lenticule extraction (SMILE). We also agree with their observation that prevention is the best solution for this condition and we would like to add here two techniques described by one of us (SJ) to facilitate easy extract...

We observed, and believe it to be the first time, the self-formation of periodic, supramolecular ~micrometer scale! pillar arrays in a thin, single-homopolymer film melt, which was originally flat on a plate. The self-formation was induced by placing a second plate ~called a mask! a distance above the polymer film. The pillars, formed by rising against the gravitational force and surface tensio...

Surface defects are important factors to surface quality of steel plates. The detection and recognition of surface defects can provide effective information for production optimization. There are several types of surface defects on hot rolled steel plates which are covered by lots of scales. The purpose of this paper is to recognize eight kinds of typical surface defects from scales. Bandelet t...

Elastomer polydimethylsiloxane (PDMS) films with embedded in-plane gradient stress are created by making PDMS/(PDMS + silicone oil) crosslinked bilayers and extracting the oil in a suitable organic solvent bath. The collapse of the elastomer after oil extraction generates differential stress in the films that is manifested through their out-of-plane deformation. The curvature κ of narrow stripe...

In this paper we consider an on{line problem related to minimizing the diameter of a dynamic tree T. A new edge f is added, and our task is to delete the edge e of the induced cycle so as to minimize the diameter of the resulting tree T ffgnfeg. Starting with a tree with n nodes, we show how each such best swap can be found in worst{case O(log 2 n) time. The problem was raised by Italiano and R...