A new contact algorithm is presented which satisfies both stability and the contact patch test. The segment-to-segment algorithm involves a contact pressure interpolation and an accurate integration of the contact constraints over the surfaces of the contacting bodies. Numerical integration is carried out over sub-segments based on the element topologies of both contacting surfaces. The algorit...

We present an efficient variant of LLL-reduction of lattice bases in the sense of Lenstra, Lenstra, Lovász [LLL82]. We organize LLL-reduction in segments of size k. Local LLL-reduction of segments is done using local coordinates of dimension 2k. Strong segment LLL-reduction yields bases of the same quality as LLL-reduction but the reduction is n-times faster for lattices of dimension n. We exte...

The objective of the present study was to compare single segment and double segment INTACS rings in the treatment of post-LASIK ectasia. In this interventional study, 26 eyes with post-LASIK ectasia were assessed. Ectasia was defined as progressive myopia regardless of astigmatism, along with topographic evidence of inferior steepening of the cornea after LASIK. We excluded those with a history...

THIS year’s EURETINA meeting included a joint EURETINA/ESCRS symposium on where anterior segment and posterior segment surgery meet. Commencing the session, co-chairman, Gisbert Richard MD, University Medical Centre Hamburg-Eppendorf, described a combined surgery procedure for cataract patients who require pars plana vitrectomy (PPV) for such indications as epiretinal membranes, macular holes a...

Background and Aims: In humans the group A rotaviruses are associated with endemic diarrhea in children under the age of 5, leading to approximately 800,000 deaths every year. Introduction of rotavirus vaccines into childhood immunization programs can contribute to substantial reduction in mortality from rotavirus gastroenteritis in developing countries and virtually eliminating hospitalization...