Results 51 to 60 of about 482,948 (211)

Robust measurement of orbital angular momentum of a partially coherent vortex beam under amplitude and phase perturbations

Opto-Electronic Science
The ability to overcome the negative effects, induced by obstacles and turbulent atmosphere, is a core challenge of long-distance information transmission, and it is of great significance in free-space optical communication.
Zhao Zhang, Gaoyuan Li, Yonglei Liu, Haiyun Wang, Bernhard J. Hoenders, Chunhao Liang, Yangjian Cai, Jun Zeng   +7 more
doaj   +1 more source

Visual Field and Optical Coherence Tomography Parameters With and Without Positive Family History of Glaucoma

Journal of Nepal Health Research Council
Background: To evaluate the Retinal Nerve Fiber Layer and Ganglion Cell Complex thickness using Spectral Domain Optical Coherence Tomography with and without positive family history of Primary Open Angle Glaucoma and its relation to visual field ...
Sabitri Bhatta, Suresh Awasthi, Gyan Bahadur Basnet, Indra Man Maharjan   +3 more
doaj   +1 more source

Reinforcement of genetic coherence in a two-locus model

BMC Evolutionary Biology, 2001
Background In order to maintain populations as units of reproduction and thus enable anagenetic evolution, genetic factors must exist which prevent continuing reproductive separation or enhance reproductive contact.
Steiner Wilfried, Gregorius Hans-Rolf
doaj   +1 more source

Text categories and text-forming potential of multicomponent collaterally subordinating constructions with the meaning of conditionality

Неофилология, 2021
In a series of complex study of multicomponent or polypredicative complex sentences, it is relevant to consider them as a microtext. In the text study discussion issues still exist: the number and composition of categories, the means of their expression,
N. P. Galkina
doaj   +1 more source

Inverse scattering problem for optical coherence tomography [PDF]

, 2003
We deal with the imaging problem of determining the internal structure of a body from backscattered laser light and low-coherence interferometry. Specifically, using the interference fringes that result when the backscattering of low-coherence light is ...
Bruno, Oscar P., Chaubell, Julian
core   +1 more source

General theorem of spatial coherence: application to three-dimensional imaging [PDF]

, 1996
Three-dimensional imaging of incoherent light sources by the Michelson stellar interferometer is considered. When the interferometer’s pinholes are arranged properly, its output result is equivalent to a two-dimensional Fourier hologram that stores ...
Rosen, Joseph, Yariv, Amnon
core   +1 more source

Assessment of radial peripapillary capillary and macular vascular density in primary open angle glaucoma

Journal of the Egyptian Ophthalmological Society, 2020
Purpose The aim was to assess radial peripapillary capillary (RPC) and macular vascular density in eyes with primary open angle glaucoma (POAG). Patients and methods This observational cross-sectional study included 60 eyes of normal person and 67 eyes ...
Haitham Y Al-Nashar, Wael M El-Haig, Mohammed A Al-Naimy   +2 more
doaj   +1 more source

Dynamical changes of the polar cap potential structure: an information theory approach [PDF]

Nonlinear Processes in Geophysics, 2011
Some features, such as vortex structures often observed through a wide spread of spatial scales, suggest that ionospheric convection is turbulent and complex in nature.
I. Coco, G. Consolini, E. Amata, M. F. Marcucci, D. Ambrosino   +4 more
doaj   +1 more source

Three-dimensional imaging of random radiation sources [PDF]

, 1996
A method to image random three-dimensional source distributions is proposed. We show that, by using a Michelson stellar interferometer in a prescribed fashion, one is able to measure a special form of a three-dimensional degree of coherence.
Rosen, Joseph, Yariv, Amnon
core  

Flexible Construction of a Partially Coherent Optical Array

Photonics
In this article, we introduce a flexible and programmable method to construct a multi-parameter optical array to meet urgent and personalized needs, such as multi-particle capture and manipulation and material processing, and enrich the degree of freedom
Kaiqi Zhu, Yilin Wu, Mengdi Li, Xiaofei Li, Yaru Gao, Xianlong Liu   +5 more
doaj   +1 more source