66, 0 64, respectively)
CONCLUSION: Findings show that postoperative autorefraction can be used to estimate the manifest refraction in eyes with diffractive multifocal IOLs.”
“The aim of this work is to investigate the effect of finite element formulation and element SB202190 molecular weight type on the accuracy of 3D modeling of generalized Newtonian fluid flow in complex domains. Computer models based on three finite element solution schemes (mixed, continuous, and discrete penalty), and two element types (hexahedral and
tetrahedral) in a 3D framework were developed. The well-known Carreau model was used to reflect the theological behavior of the fluid. To determine the validity of the developed computer simulations, the flow of two high-density polyethylene (HDPE) melts with different
viscosities through an extrusion die was simulated and compared with experimentally measured data. Comparison showed that the three methods produced nearly the same results with the hexahedral elements. However, continuous penalty method using tetrahedral elements demonstrated an extreme discrepancy from the experimental data. Discrete penalty method was unable to predict secondary variable (pressure) accurately using tetrahedral elements. The best results were obtained by the use of mixed method in conjunction with tetrahedral elements. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 120: 1607-1615, 2011″
“Dislocation dynamics (DD) simulations are used to investigate the acoustic BAY 63-2521 solubility dmso nonlinearity created by dislocations in crystals. The acoustic nonlinearity parameter, beta, is quantitatively predicted for a single dislocation bowing in its glide plane between pinning points under Selleckchem SBE-β-CD a
quasistatic loading assumption using DD simulations. The existing model using a constant line energy assumption fails to capture the correct behavior of beta for edge dislocations in materials with a nonzero Poisson’s ratio. A strong dependence of beta on the orientation of Burgers vector relative to the line direction of the dislocation is shown by the DD simulations. A new model using an orientation-dependent line energy is derived for the cases of initially pure edge and screw dislocations. The model is shown to agree with the DD simulations over a range of Poisson’s ratio and static stresses. (C) 2011 American Institute of Physics. [doi:10.1063/1.3530736]“
“PURPOSE: To study the relationship between the optics quality of multifocal intraocular lenses (IOLs) and distance-corrected near, intermediate, and distance visual acuity to determine the degree to which optics quality must change to produce a significant difference in visual acuity.
SETTING: Fundacion Oftalmologica del Mediterraneo, Valencia, Spain.
METHODS: Monocular distance-corrected visual acuity (decimal and logMAR) was measured at 4 m, 70 cm, and 30 cm under photopic and mesopic conditions in eyes with 1 of 3 multifocal IOL models. Visual acuity versus the “”average modulation”" of the IOL was assessed.