Results 11 to 20 of about 138,992 (294)
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
Flexural Behavior of Bidirectionally Graded Lattice
Advanced Engineering Materials, EarlyView., 2023 An experimental study of the bending behavior of bidirectional body‐centered cubic lattice beams is conducted in comparison to uniform and unidirectional counterparts of electron beam melted SS 316 L. Experimental results are used to develop and validate a finite element model which is subsequently used to conduct parametric studies to assess the ...
Chamini Rodrigo +4 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
Indian Journal of Ophthalmology, 2023 Purpose: To study the prevalence and determinants of compliance with spectacle wear among school-age children in South India who were given spectacles free of charge under a school vision screening program. Methods: A cross-sectional, descriptive study
Neelam Pawar +5 more
doaj +1 more source
Refraction of Electromagnetic Energy for Wave Packets Incident on a Negative Index Medium is Always Negative [PDF]
Phys. Rev. E 69, 026604 (2004), 2003 We analyze refraction of electromagnetic wave packets on passing from an isotropic positive to an isotropic negative refractive index medium. We definitively show that in all cases the energy is always refracted negatively. For localized wave packets, the group refraction is also always negative.
arxiv +1 more source
Journal of Ophthalmology, 2016 The aim of the study was to determine the level of agreement between Javal’s rule, autorefraction, retinoscopy, and refractive astigmatism and to determine which technique is the most suitable substitute when subjective refraction is not applicable using
Kofi Asiedu +2 more
doaj +1 more source
Alʹmanah Kliničeskoj Mediciny, 2016 Background: In the past decade, significant increase of pediatric morbidity was detected. Frequency of varied functional disorders tends to increase during school years.
A. A. Ermashova +5 more
doaj +1 more source
Amphoteric refraction at the interface between isotropic and anisotropic media [PDF]
Optics Communication 254, 353 (2005)., 2006 It is found that the amphoteric refraction, i.e. the refraction can be either positive or negative depending on the incident angles, could occur at a planar interface associated with a uniaxially anisotropic positive index media (PIM) or an anisotropic negative index media (NIM).
arxiv +1 more source
ABCD matrix for reflection and refraction of laser beam at tilted concave and convex elliptic paraboloid interfaces and studying laser beam reflection from a tilted concave parabola of revolution [PDF]
Journal of Electrical and Computer Engineering Innovations, 2015 Studying Gaussian beam is a method to investigate laser beam propagation and ABCD matrix is a fast and simple method to simulate Gaussian beam propagation in different mediums.
M. Mansour Abadi +3 more
doaj +1 more source
Mental Representations and Cognitive Schemata of Ninth Grade Students for the Refraction of Light
Education Sciences, 2023 The current research study deals with students’ mental representations and cognitive schemata of light refraction. In the study, 213 ninth grade students participated who had taken basic Geometric Optics courses on refraction and Snell’s law.
George Fyttas +3 more
doaj +1 more source