Results 11 to 20 of about 189,401 (272)
Performance analysis of control allocation using data‐driven integral quadratic constraints
Advanced Control for Applications, Volume 4, Issue 4, December 2022., 2022 Abstract A new method is presented for evaluating the performance of a nonlinear control allocation system within a linear control loop. To that end, a worst‐case gain analysis problem is formulated that can be readily solved by means of well‐established methods from robustness analysis using integral quadratic constraints (IQCs).
Manuel Pusch +2 more
wiley +1 more source
Advanced Engineering Materials, EarlyView., 2023 A numerical scheme is presented to design a lattice support for metallic components additively built via laser powder bed fusion. Results show that thermal‐induced distortion can be respectively reduced by 69%, 58%, and 50% in comparison to a uniform lattice, a fully solid support, and a truss‐based lattice support.
Jiazheng Hu +2 more
wiley +1 more source
Association between Refractive Error Types and Asthenopia in Primary School Students
Majalah Kedokteran Bandung, 2021 Refractive error is a condition in which the cornea and lens fail to focus the light, resulting in reduced visual efficiency. Twelve million children are experiencing refractive errors worldwide and uncorrected refractive errors in children have been ...
Vanessa Kuswanto +2 more
doaj +1 more source
Refractive errors among medical students in Jordan: prevalence, types and possible risk factors
Future Science OA, 2023 Aim: This study aims to determine the prevalence of refractive errors among medical students in Jordan. Materials & methods: Cross-sectional model through an online questionnaire was conducted.
Asem A Alqudah +2 more
doaj +1 more source
Saudi Journal for Health Sciences, 2022 Background: Refractive errors are the leading cause of visual impairments in the Kingdom of Saudi Arabia (KSA). Laser refractive eye surgeries are getting huge popularity for correcting these visual impairments in KSA and other gulf countries.
Abdullhamid S AlGhamdi +4 more
doaj +1 more source
Towards Automating Retinoscopy for Refractive Error Diagnosis [PDF]
arXiv, 2022 Refractive error is the most common eye disorder and is the key cause behind correctable visual impairment, responsible for nearly 80% of the visual impairment in the US. Refractive error can be diagnosed using multiple methods, including subjective refraction, retinoscopy, and autorefractors.
arxiv
Atmospheric Refractive Electromagnetic Wave Bending and Propagation Delay [PDF]
PASP 127, 947, p. 74-91, 2015, 2014 In this tutorial we summarize the physics and mathematics behind refractive electromagnetic wave bending and delay. Refractive bending and delay through the Earth's atmosphere at both radio/millimetric and optical/IR wavelengths are discussed, but with most emphasis on the former, and with Atacama Large Millimeter Array (ALMA) applications in mind.
arxiv +1 more source
The Cryogenic Refractive Indices of S-FTM16, a Unique Optical Glass for Near-Infrared Instruments [PDF]
Publ.Astron.Soc.Pac. 116 (2004) 833, 2004 The Ohara glass S-FTM16 is of considerable interest for near-infrared optical designs because it transmits well through the K band and because negative S-FTM16 elements can be used to accurately achromatize positive calcium fluoride elements in refractive collimators and cameras.
arxiv +1 more source
On the inapplicability of a negative-phase-velocity condition as a negative-refraction condition for active materials [PDF]
Microw. Opt. Technol. Lett., vol. 51, p. 1230 (2009), 2008 A negative-phase-velocity condition derived by Depine and Lakhtakia [Microwave Opt Technol Lett 41 (2004) 315] for isotropic, homogeneous, passive, dielectric-magnetic materials is inapplicable as a negative-refraction condition for active materials.
arxiv +1 more source
Agreement between methods of retinoscopy, conventional subjective refraction and fogging subjective refraction [PDF]
Reviews in Clinical MedicinePurpose: to compare the refractive error measurements achieved through three distinct techniques: retinoscopy, subjective method, and the subjective fogging method. Methods: Participants included 223 young adults aged 18 to 36 years (mean age: 25.63±5.31)
Atefeh Kebriaei +6 more
doaj +1 more source