Results 21 to 30 of about 138,992 (294)

Wave-vector and polarization dependence of conical refraction [PDF]

open access: yesOpt. Express 21, 4503-4511 (2013), 2014
We experimentally address the wave-vector and polarization dependence of the internal conical refraction phenomenon by demonstrating that an input light beam of elliptical transverse profile refracts into two beams after passing along one of the optic axes of a biaxial crystal, i.e. it exhibits double refraction instead of refracting conically.
arxiv   +1 more source

Vector Analysis Reveals That Topography-Guided LASIK Targeting the Manifest Refraction (MR) is Superior to Topography-Modified Refraction (TMR) and Layer Yolked Reduction of Astigmatism (LYRA) [Letter]

open access: yesClinical Ophthalmology, 2021
Avi Wallerstein,1,2,* Mathieu Gauvin1,2,* 1Department of Ophthalmology and Visual Sciences, McGill University, Montreal, QC, Canada; 2LASIK MD, Montreal, QC, Canada*These authors contributed equally to this workCorrespondence: Avi Wallerstein 1250 Rene ...
Wallerstein A, Gauvin M
doaj  

Land-Streamer vs. Conventional Seismic Data for High-Resolution Near-Surface Surveys

open access: yesApplied Sciences, 2022
Near-surface high-resolution seismic mapping is very important in many applications such as engineering and environmental. However, the conventional setup of the seismic technique requires planting geophones, connecting cables, and then collecting all ...
Sherif M. Hanafy
doaj   +1 more source

بواعث الانكسار في شعر محمد بن عمار الأندلسي The motives of refraction in the poetry of Muhammad ibn Ammar al-Andalusi

open access: yesJournal Of Babylon Center For Humanities Studies, 2021
The motivation to say poetry among the poets is variable and not fixed, according to the poet’s psychological state, fluctuations and poetic moment, and according to the poet’s environment and way of life, and the life situations that he faces in which ...
انعام حميد ناصر Inaam Hameed Naser   +1 more
doaj  

A Novel Vision-Based Pose Measurement Method Considering the Refraction of Light

open access: yesSensors, 2018
Nowadays, due to the advantages of non-contact and high-speed, vision-based pose measurements have been widely used for aircraft performance testing in a wind tunnel. However, usually glass ports are used to protect cameras against the high-speed airflow
Wei Liu   +5 more
doaj   +1 more source

Physical and Methodological Perspectives on the Optical Properties of Biological Samples: A Review

open access: yesPhotonics, 2021
The optical properties of biological systems can be measured by imaging and microscopy methodologies. The use of X-rays, γ-radiation and electron microscopy provides information about the contents and functions of the systems. The need to develop imaging
George I. Lambrou   +4 more
doaj   +1 more source

Reflection and refraction of an electron spin at the junction between two two-dimensional regions with and without spin-orbit interaction [PDF]

open access: yesPhysica Scripta, Vol. 96, 065806 (2021), 2020
We derive the reflection and refraction laws for an electron spin incident from a quasi-two-dimensional medium with no spin-orbit interaction on another with both Rashba and Dresselhaus spin-orbit interaction using only energy conservation. We obtain the well-known result that for an incident angle, there can be generally two different refraction ...
arxiv   +1 more source

Correction methods for underwater scan data measured by general-purpose laser range finders

open access: yesNihon Kikai Gakkai ronbunshu, 2015
We propose a method that corrects effects of refractions and absorptions for underwater scan data obtained by general-purpose laser range finders (LRFs) using HOKUYO UTM-30LX (Top-URG). For measurements by LRFs in water, it is known that refractions make
Tomofumi FUJIWARA   +3 more
doaj   +1 more source

Comparison of endpoint of subjective cycloplegic refraction with artificial aperture and post-mydriatic test among adults with refractive error

open access: yesTaiwan Journal of Ophthalmology, 2020
PURPOSE: There is a need to understand the requirement for the post-mydriatic test (PMT) among adults for the final prescription of spectacles as this test increases the cost of eye care and causes inconvenience to the patient because of the additional ...
Nagarajan Theruveethi   +2 more
doaj   +1 more source

Using microwave refraction to determine local inhomogeneities of a rotating plasma

open access: yesNukleonika, 2023
To determine the local inhomogeneities of a rotating plasma, the method based on microwave refraction was used. The method is based on spectral and correlation analysis of the reflected signals from the rotating plasma layer at normal and inclined ...
Martseniuk Yurii P.   +2 more
doaj   +1 more source

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