Results 21 to 30 of about 771,659 (382)
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
doaj +1 more source
Strong lensing, cosmology and lensing halos [PDF]
Journal of Cosmology and Astroparticle Physics, 2006 With future wide and deep cosmological sky surveys, a large number of gravitationally lensed, multiply imaged systems will be found. In addition to multiply imaged galaxies and quasars, sources will include transient events like supernovae and gamma ray bursts in which case very accurate time delay measurements are possible.
Edvard Mörtsell, Christoffer Sunesson
openaire +3 more sources
The more legs the merrier: A new composition for symmetric (multi-)lenses [PDF]
EPTCS 333, 2021, pp. 92-107, 2021 Lenses are a category theoretic construct and are used in a wide variety of applications. Symmetric lenses compose to, of course, form new symmetric lenses. Symmetric lenses are usually represented as spans of asymmetric lenses. In many applications, the fact that a symmetric lens might also be represented as a cospan of asymmetric lenses is important,
arxiv +1 more source
Weak lensing by voids in weak lensing maps [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2018 ABSTRACT Cosmic voids are an important probe of large-scale structure that can constrain cosmological parameters and test cosmological models. We present a new paradigm for void studies: void detection in weak lensing convergence maps.
Christopher T Davies +2 more
openaire +4 more sources
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
Weak-Lensing Ellipticities in a Strong-Lensing Regime [PDF]
The Astrophysical Journal, 2008 It is now routine to measure the weak gravitational lensing shear signal from the mean ellipticity of distant galaxies. However, conversion between ellipticity and shear assumes local linearity of the lensing potential (ie that the spatial derivatives of the shear are small), and this condition is not satisfied in some of the most interesting regions ...
Massey, R., Goldberg, D.M.
openaire +7 more sources
Weak Gravitational Lensing [PDF]
Phys.Rept.340:291-472,2001, 1999 We review theory and applications of weak gravitational lensing. After summarising Friedmann-Lemaitre cosmological models, we present the formalism of gravitational lensing and light propagation in arbitrary space-times. We discuss how weak-lensing effects can be measured.
arxiv +1 more source
Polished diamond x-ray lenses [PDF]
, 2021 We present high quality bi-concave 2D focusing diamond x-ray lenses of apex-radius $R=100~\mu$m produced via laser-ablation and improved via a mechanical polishing process. Both for polished and unpolished individual lenses and for stacks of 10 lenses, we show the remaining figure errors determined using x-ray speckle tracking and compare these results
arxiv +1 more source
The Journal of Engineering, 2019 There exists few reports in the literature aimed at estimating depth from the spectrally-varying-amount-of-defocus contained in a single image generally captured by a commercial colour camera.
Wei Jiang, Dingrong Yi, Linghua Kong
doaj +1 more source
The Environments of SLACS Gravitational Lenses [PDF]
, 2007 We report on an investigation of the environments of the SLACS sample of gravitational lenses. The local and global environments of the lenses are characterized using SDSS photometry and, when available, spectroscopy.
Auger, M. W.
core +1 more source