For the purpose of increasing the permeability to oxygen and equilibrium water content in contact lenses, polar copolymers with nonionic monomers such as 2-hydroxyethle methacrylate(HEMA) Is used. By adding the polar monomers to (HEMA), the permeability to oxygen and equilibrium with water content is increased and also the absorption of proteins on lens surface is changed. In this research, the...

Introduction: The aim of this study was to investigate the effect of dentinal pretreatment on the static contact angle of a bonding agent as a measure of dentin surface wettability. Materials &Methods: Twenty mid-coronal dentin surfaces were prepared and randomly allocated to four groups (n=5) according to the priming solutions. All segments were etched with 35% phosphoric acid gel for 15 s,...

Dans cet article on démontre que si une structure de contact sur variété dimension trois est portée par un livre ouvert à pages planaires, alors certaine configuration d’intersections n’apparaît dans l’homologie d’aucun ses remplissages minimaux. On plus les d’une telle ne contiennent pas surface symplectique genre positif. En appliquant ces obstructions aux structures canoniques bords des sing...

Abstract We propose a frictionless contact formulation for isogeometric analysis, which combines collocated the surfaces with standard Galerkin treatment of bulk. denote it as Collocated Contact Surface (CCS) formulation. The approach is based on simple pointwise enforcement constraints, performed in this study penalty method. Unlike (node-to-surface or point-to-surface) algorithms framework, C...

It has been shown experimentally that boundary friction is proportional to load (commonly known as Amontons’ law) for more than 500 years, and the fact it holds true over many scales (from microns kilometres, from nano-Newtons Mega-Newtons) materials which deform both elastically plastically subject of much research, in order fully understand its wide applicability (and also find any deviations...