Results 1 to 10 of about 619,306 (307)
Astronomy and Astrophysics Review, 2011 Clusters of galaxies are the most recently assembled, massive, bound structures in the Universe. As predicted by General Relativity, given their masses, clusters strongly deform space-time in their vicinity.
Jean-Paul Kneib, Priyamvada Natarajan
exaly +8 more sources
Modern Digital technology and its role in Cinematography using available light [PDF]
Maǧallaẗ Al-Turāṯ wa Al-Taṣmīm, 2022 the use of available light (it is any natural or artificial light or a mixture of them) is an artistic phenomenon where all types of available light can be used dramatically and adapted by the director of photography so that he can convey the dramatic ...
Maged Mahmoud +2 more
doaj +1 more source
Grey Filter Contact Lens as Therapeutic Option for Acquired Reduced Binocular Visual Performance
British and Irish Orthoptic Journal, 2021 Disturbing binocular problems can be too complex to be treated in such a way that comfortable binocular single vision is restored. The grey filter contact lens could offer a safe and clinically useful way to help these patients. Background: In unilateral
Hans van Vliet +5 more
doaj +1 more source
Negative Index Metamaterial Lens for Subwavelength Microwave Detection
Sensors, 2021 Metamaterials are engineered periodic structures designed to have unique properties not encountered in naturally occurring materials. One such unusual property of metamaterials is the ability to exhibit negative refractive index over a prescribed range ...
Srijan Datta +6 more
doaj +1 more source
Trifocal Intraocular Lens Implantation to Treat Visual Demands in Mongolian Patients
Central Asian Journal of Medical Sciences, 2022 Objective: Intraocular lens (IOL) implants are artificial lenses which helps to clear up the vision after cataract surgery. In this work, we aimed to compare the monofocal and trifocal IOL implantation during phacoemulsification.
Narangarav Gunchin-Ish +2 more
doaj +1 more source
Journal of Ophthalmic & Vision Research, 2022 Purpose: To evaluate the ray tracing method's accuracy employing Okulix ray tracing software and thin-lens formulas to calculate intraocular lens (IOL) power using a swept-source optical coherence tomography (SS-OCT) biometer (OA2000).
Reza Ghaffari +5 more
doaj +1 more source
IET Microwaves, Antennas & Propagation, 2023 This study proposes an analytical formulation in complex coordinates to synthesise three‐dimensional single‐shell dielectric lens surfaces. An exact formulation based on geometrical optics is developed, and the synthesis problem is modelled as a non ...
Aline Rocha deAssis +2 more
doaj +1 more source
The Astrophysical Journal, 2001 The analysis of the shear induced by a single cluster on the images of a large number of background galaxies is all centered around the curl-free character of a well-known vector field that can be derived from the data. Such basic property breaks down when the source galaxies happen to be observed through two clusters at different redshifts, partially ...
G. Bertin, M. Lombardi
openaire +3 more sources
AUTOMATION OF LENSES CENTERING AT GLUING IN THE FRAME [PDF]
Научно-технический вестник информационных технологий, механики и оптики, 2015 This paper discusses the causes of lenses decentration at their gluing in the frame. We give the dependences of displacement value of the centers of curvature for the lens working surfaces from the base frame axis on the primary technological errors of ...
B. D. Bao, S. M. Latyev, R. Theska
doaj +1 more source
RESEARCH MARKETING TOOLS, WHICH IMPROVE THE LIFE OF PEOPLE WITH DISABILITIES [PDF]
, 2002 Parabolic refractive X-ray lenses are optical components, especially suitable for third-generation synchrotron radiation sources. This article describes the status of the development of our lenses and illustrates the possibilities for micrometre and ...
Benner, Boris +7 more
core +2 more sources