Results 111 to 120 of about 833,654 (360)
Effect of Oxygen Content on Surface and Subsurface Integrity During Turning of Ti–6Al–4V
Advanced Engineering Materials, EarlyView.This study examines how oxygen content in the ambient atmosphere affects the surface and subsurface properties of Ti–6Al–4V during turning. Results show that oxygen does not influence surface roughness. However, machining in an extremely high vacuum‐adequate atmosphere increases surface hardness by up to 7.8% and induces compressive residual stresses ...
Benjamin Bergmann +3 more
wiley +1 more source
Demo 22-18 Ray Tracing with Lenses
, 2001 A light box is used with several incoming parallel rays to trace the rays through focusing and defocusing lenses and to observe the focal properties of the lenses. A plano-convex lens focuses parallel rays to a point as shown in Figure 1, and is compared
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Laboratory evaluation of blended lenticular aphakic lenses
, 1988 Six types of blended lenticular aspheric lenses for the correction of aphakia were assessed with respect to mass, spectacle magnification, off-axis power errors, peripheral distortion, visual field size and cosmetic appearance.
David A. Atchison, Atchison, David A.
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Clinical OphthalmologyBharat Gurnani,1 Kirandeep Kaur2 1Department of Cataract, Cornea and Refractive Surgery, Gomabai Netralaya and Research Centre, Neemuch, Madhya Pradesh, 458441, India; 2Department of Cataract, Pediatric Ophthalmology and Strabismus, Gomabai Netralaya and
Gurnani B, Kaur K
doaj
LED-based indoor positioning system using novel optical pixelation technique
Healthcare Technology Letters, 2019 At present, about 47 million people worldwide have Alzheimer's disease (AD), and because there is no treatment currently available to cure AD, people with AD (PWAD) are cared for.
Olaoluwa R. Popoola +4 more
doaj +1 more source
Demo 22-20 Fillable Air Lenses
, 2001 Hollow convex and concave lenses inserted into water function opposite to normal glass lenses in air. A double concave air lens is shown in the video to focus light under water, as seen in Figure 1, but to defocus light when filled with water and used in
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Chromatic-aberration-corrected diffractive lenses for ultra-broadband focusing
Scientific Reports, 2016 We exploit the inherent dispersion in diffractive optics to demonstrate planar chromatic-aberration-corrected lenses. Specifically, we designed, fabricated and characterized cylindrical diffractive lenses that efficiently focus the entire visible band ...
Peng Wang, Nabil Mohammad, R. Menon
semanticscholar +1 more source
Near‐Field Electrospinning Micro‐Printhead Achieves Precise Control of Nanofiber Deposition
Advanced Engineering Materials, EarlyView.A micro‐printhead for near‐field electrospinning enables reproducible deposition of polymer nanofibers with diameters below 50 nm. Systematic parameter studies uncover the mechanisms linking operating conditions to fiber morphology, paving the way for precise and low‐cost nanoscale 3D manufacturing.As a high‐resolution, cost‐effective, and rapid ...
Han Xu, Dario Mager, Jan G. Korvink
wiley +1 more source
Research on the Influence of Cleaning Products on the Quality of Optical Lens Surfaces
The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials ScienceThe paper presents research on the evaluation of the influence of maintenance products, such as cleaning solutions, on the quality of lenses. The research analysed the effects of these products on scratch resistance and image clarity. The eyeglass lenses
Beatrice Daniela TUDOR +1 more
doaj +1 more source
Applied Sciences, 2018 We propose a novel design method for multi-focal metallic Fresnel zone plates (MFZPs), which exploits the phase selection rule by putting virtual point sources (VPSs) at the desired focal points distant to the MFZP plane.
Jinseob Kim +5 more
doaj +1 more source