Results 11 to 20 of about 626,937 (305)
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
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Is There a Quad Problem among Optical Gravitational Lenses? [PDF]
, 2007 Most of optical gravitational lenses recently discovered in the Sloan Digital Sky Survey Quasar Lens Search (SQLS) have two-images rather than four-images, in marked contrast to radio lenses for which the fraction of four-image lenses (quad fraction) is ...
Oguri, Masamune
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Effect of plant-based feed ingredients on osmoregulation in the Atlantic salmon lens [PDF]
, 2010 Lenses of adult Atlantic salmon fed with a plant oil and plant protein-based diet (plant diet) were compared to lenses of fish fed a diet based on traditional marine ingredients (marine diet) with respect to biochemical composition and functionality ex ...
Baslow +52 more
core +1 more source
Imaging with Pairs of Skew Lenses [PDF]
, 2017 Many of the properties of thick lenses can be understood by considering these as a combination of parallel ideal thin lenses that share a common optical axis. A similar analysis can also be applied to many other optical systems.
Belin, Jakub +3 more
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Gradient Index Metasurface Lens for Microwave Imaging
Sensors, 2022 This paper presents the design, simulation and experimental validation of a gradient-index (GRIN) metasurface lens operating at 8 GHz for microwave imaging applications. The unit cell of the metasurface consists of an electric-LC (ELC) resonator.
Srijan Datta +2 more
doaj +1 more source
The 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. Clusters act as some of the most powerful gravitational lenses in the Universe.
Kneib, Jean-Paul, Natarajan, Priyamvada
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On the Nature and Location of the Microlenses [PDF]
, 1999 This paper uses the caustic crossing events in the microlens data sets to explore the nature and location of the lenses. We conclude that the large majority of lenses, whether they are luminous or dark, are likely to be binaries.
Afonso C. +17 more
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The Long-Term Effect of Blue-Light Blocking Spectacle Lenses on Adults’ Contrast Perception
Frontiers in Neuroscience, 2022 PurposeTo evaluate the long-term effect of two different degrees of blue-light blocking (BB) spectacle lenses on adults’ contrast perception under various lighting conditions.MethodsIn total, 144 healthy adults aged 24.70 (±4.32 years) were recruited to ...
Yan Lian +5 more
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Liquid Crystal Devices for Beam Steering Applications
Micromachines, 2021 Liquid crystals are valuable materials for applications in beam steering devices. In this paper, an overview of the use of liquid crystals in the field of adaptive optics specifically for beam steering and lensing devices is presented.
Rowan Morris +2 more
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Optics Express, 2007 In this paper we present a new kind of kinoform lenses in which the phase distribution is characterized by the "devil's staircase" function. The focusing properties of these fractal DOEs coined devil's lenses (DLs) are analytically studied and compared with conventional Fresnel kinoform lenses.
Juan A, Monsoriu +3 more
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