نتایج جستجو برای: refractive surfaces
تعداد نتایج: 150251 فیلتر نتایج به سال:
purpose : to determine the prevalence of the uncorrected refractive errors in bojnourd students methods : in a cross-sectional study, the samples were selected proportionate to the population of the schools using stratified randomized cluster sampling. the target population was the primary and junior high school students of the city of bojnourd. visual acuity (va) (snellen chart) and cycloplegi...
SEPTEMBER 2009 I CATARACT & REFRACTIVE SURGERY TODAY EUROPE I 31 O ur visual system integrates the refractive surfaces of the cornea and the crystalline lens; the positive spherical aberration (SA) of the cornea is partially cancelled out by the negative SA of the crystalline lens.1,2 As the eye ages, the cornea remains fairly stable, but the crystalline lens thickens at the periphery, inducing...
In this research, a theoretical study has been undertaken on the density and also on the relationship between refractive index and density for aqueous solutions. A simple linear equation is suggested to show this relationship. Also, a semi-empirical equation has been developed for estimating the constant of this linear equation. By using our suggested equations, the refractive indices of aq...
Background & Objective: Refractive errors (myopia, hyperopia and astigmatism) could lead to an impaired quality of life affect a large proportion of the population worldwide, irrespective of age, sex and ethnic group. Such refractive errors can be easily diagnosed, measured and corrected with spectacles or other refractive corrections to attain normal vision. Since there is paucity of informati...
Designing multifunctional surfaces that have user-specified interactions with impacting liquids and with incident light is a topic of both fundamental and practical significance. Taking cues from nature, we use tapered conical nanotextures to fabricate the multifunctional surfaces; the slender conical features result in large topographic roughness, while the axial gradient in the effective refr...
Polystyrene surfaces obtained by spin-coating a solution of polystyrene in toluene on a gold layer were functionalized with carboxylic acid groups by preadsorption of the sodium salt of undecylenic acid, followed by an argon plasma treatment. A conjugate of albumin and heparin (alb-hep) was covalently immobilized onto the functionalized surface via preactivation of carboxylic acid groups with a...
Many rendering phenomena can be modeled with partial coverage. These include flames, smoke, hair, clouds, properly-filtered silhouettes, non-refractive glass, and special effects such as forcefields and magic. A challenge in rendering these is that the value of pixel partly covered by multiple surfaces depends on the depth order of the surfaces. One approach to avoid the cost of storing and sor...
We report on the enhancement of photoluminescence PL from polymer thin films by nanotexturing their surfaces using nanoporous anodic alumina oxide templates. Chromophore-embedded polystyrene films with nanostructured surfaces are prepared by imprinting 200 nm diameter nanopillars with various heights, and their PL output and angular emission are observed. The PL output increases and the angular...
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