Results 41 to 50 of about 775,307 (358)
Randomized controlled trial of anterior-chamber intraocular lenses in Nepal: long-term follow-up
Bulletin of the World Health OrganizationMost of the estimated 20 million people who are blind with cataracts live in rural areas of developing countries, where expert surgical resources are scarce.
J.R. Evans +7 more
doaj +1 more source
3D Printed Radar Lenses with Anti-Reflective Structures
Designs, 2019 Background: The purpose of this study was to determine if 3D printed lenses with wavelength specific anti-reflective (AR) surface structures would improve beam intensity and thus radar efficiency for a Printed Circuit Board (PCB)-based 60 GHz radar. This
Ross J. Friel +3 more
doaj +1 more source
, 1999 The purpose of these lecture notes is to describe the gravitational lens effects in different astrophysical contexts. These notes are voluntarily focused on the fundamental mechanisms and the basic concepts that are useful to describe these effects.
Bernardeau, F.
core +2 more sources
Gravitational lensing by spinning and radially moving lenses
Physics Letters A, 2002 8 pages; minor changes to match the published ...
Mauro Sereno, Mauro Sereno
openaire +3 more sources
Taiwan Journal of Ophthalmology, 2019 PURPOSE: The purpose of this study is to compare the contrast sensitivity function (CSF) between eyes of age-matched individuals with aspheric intraocular lens (IOL) and emmetropia.
Undrakonda Vivekanand +1 more
doaj +1 more source
Using two-dimensional graphene lenses to increase the effectiveness of solar panels
Revue des Énergies Renouvelables, 2023 We aim to enhance the efficiency of solar panels by covering them with graphene lenses that collect and concentrate light rays onto the panels. The simulation was performed using the Monte Carlo method and provided precise results regarding the ...
Abid Boudiar +2 more
doaj +1 more source
Finding Strong Gravitational Lenses in the Kilo Degree Survey with Convolutional Neural Networks [PDF]
, 2017 The volume of data that will be produced by new-generation surveys requires automatic classification methods to select and analyze sources. Indeed, this is the case for the search for strong gravitational lenses, where the population of the detectable ...
Chatterjee, S. +10 more
core +3 more sources
Gravitational Lenses With More Than Four Images: I. Classification of Caustics
, 2000 We study the problem of gravitational lensing by an isothermal elliptical density galaxy in the presence of a tidal perturbation. When the perturbation is fairly strong and oriented near the galaxy's minor axis, the lens can produce image configurations ...
Charles R. Keeton +9 more
core +1 more source
Microfabricated rubber microscope using soft solid immersion lenses [PDF]
, 2006 We show here a technique of soft lithography to microfabricate efficient solid immersion lenses (SIL) out of rubber elastomers. The light collection efficiency of a lens system is described by its numerical aperture (NA), and is critical for applications
Gambin, Yann +2 more
core +1 more source
Evolutionary interplay between viruses and R‐loops
FEBS Letters, EarlyView.Viruses interact with specialized nucleic acid structures called R‐loops to influence host transcription, epigenetic states, latency, and immune evasion. This Perspective examines the roles of R‐loops in viral replication, integration, and silencing, and how viruses co‐opt or avoid these structures.
Zsolt Karányi +4 more
wiley +1 more source