Results 11 to 20 of about 212,491 (313)
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
Journal of Ophthalmic & Vision Research, 2023 Purpose: This study aimed to assess the agreement between topographic indices of healthy subjects and keratoconus (KCN) patients using a swept-source optical coherence tomography (SS-OCT CASIA2) versus a Scheimpflug camera (Pentacam). Methods: 40 eyes of
Hamed Ghassemi +5 more
doaj +1 more source
Journal of Nepal Medical Association, 2023 Introduction: Refractive error is the inability of eyes to focus clearly on images. Visual impairment due to refractive error has a major impact on children's education and daily activities.
Govind Gurung, Krishna Kant Gupta
doaj +1 more source
Distribution of refractive error among chinese primary school children in a rural area in Pahang, Malaysia [PDF]
Malaysian Family Physician, 2022 Purpose: This study aimed to determine the prevalence and status of refractive error among Chinese primary school children in a rural area in Pahang. Methods: This investigation entailed a cross-sectional retrospective study design involving case file ...
Rokiah Omar +3 more
doaj +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
Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices [PDF]
Exp. Therm. Fluid Sci., 136:110681 (2022), 2022 Inhomogeneous refractive index fields lead to errors in optical flow velocity measurements. Former respective studies are mostly in quasi two-dimensional flows, and attribute the measurement errors to spatial gradients in the refractive index field, while less attention has been paid to flows with three-dimensional refractive index fields which usually
arxiv +1 more source
Deutsches Ärzteblatt international, 2016 All over the world, refractive errors are among the most frequently occuring treatable distur - bances of visual function. Ametropias have a prevalence of nearly 70% among adults in Germany and are thus of great epidemiologic and socio-economic relevance.In the light of their own clinical experience, the authors review pertinent articles retrieved by a
Peter Baumbach +4 more
openaire +3 more sources
Calculating the error in refractive error [PDF]
Eye, 2011 To demonstrate a quick way of calculating the optical difference between two refractions using vector analysis, and to express this as a score for examination purposes.An existing formula is applied, converted to a defocus equivalent, and then converted to a score.
R B Ellingham +3 more
openaire +3 more sources
BMC Ophthalmology, 2023 Purpose By comparing the results of the new self-contained darkroom refractive screener (YD-SX-A) versus table-top autorefractor and cycloplegic retinoscopy, to evaluate the performance of the YD-SX-A in detecting refractive error in children and ...
Xianxian Wei +10 more
doaj +1 more source
Prevalence of refractive errors among the school-going children in East Sikkim
Indian Journal of Ophthalmology, 2021 Purpose: Vision plays an important role in child's development for learning and communication. Uncorrected refractive error (URE) has become a major challenge to health care policy makers especially in school going children.
Karma Loday Bhutia +3 more
doaj +1 more source