Results 41 to 50 of about 390,355 (301)

Face recognition outside the visible spectrum [PDF]

Image and Vision Computing, 2016
Abstract Automated face recognition (FR) is a well-studied problem, with a history of more than three decades. Facial recognition software that uses two dimensional (2D) images has advanced significantly in terms of accuracy over recent years. Despite the steps forward, face recognition is still not considered to be a solved problem for the cases of (
Thirimachos Bourlai, Lawrence A. Hornak
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Engineering of a fluorescent chemogenetic reporter with tunable color for advanced live-cell imaging

Nature Communications, 2021
Fluorescent reporters spanning the visible spectrum are needed for imaging live cells and organisms. Here the authors report a collection of fluorogenic chromophores that cover the visible spectrum from blue to red using a single engineered and optimised
Hela Benaissa, Karim Ounoughi, Isabelle Aujard, Evelyne Fischer, Rosette Goïame, Julie Nguyen, Alison G. Tebo, Chenge Li, Thomas Le Saux, Giulia Bertolin, Marc Tramier, Lydia Danglot, Nicolas Pietrancosta, Xavier Morin, Ludovic Jullien, Arnaud Gautier   +15 more
doaj   +1 more source

Tunable organic photocatalysts for visible-light-driven hydrogen evolution [PDF]

, 2015
Photocatalytic hydrogen production from water offers an abundant, clean fuel source, but it is challenging to produce photocatalysts that use the solar spectrum effectively.
Cooper, AI, Jiang, JX, Zwijnenburg, MA, Ren, Shijie, Martijn A. Zwijnenburg (1301334), Sprick, RS, Zwijnenburg, Martijn A., Reiner Sebastian Sprick (1354191), Adams, Dave J., Guiglion, P, Zwijnenburg, Martijn A, Guiglion, Pierre, Jia-Xing Jiang (1301340), Baltasar Bonillo (1354185), Cooper, Andrew I, Jiang, Jia-Xing, Bonillo, B, Ratvijitvech, Thanchanok, Cooper, Andrew I., Pierre Guiglion (1341543), Adams, DJ, Sprick, Reiner Sebastian, Adams, Dave J, Dave J. Adams (1297446), Ren, S, Andrew I. Cooper (1297431), Ratvijitvech, T, Thanchanok Ratvijitvech (1354188), Ratvijitvech, Thanchano, Bonillo, Baltasar, Shijie Ren (1301349)   +30 more
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Compact Light-Harvesting System Based on a Glass Conical Waveguide Coupled to a Single Multimode Optical Fiber

Sci
This research presents a lens-based light collection system that integrates a handmade glass conical waveguide (GCW) with a single silica multimodal optical fiber (SMMF) and a concentrator Fresnel lens (FL).
Daniel Toral-Acosta, Ricardo Chapa-Garcia, Romeo Selvas-Aguilar, Juan L. López, Arturo Castillo-Guzmán, Abraham Antonio González-Roque   +5 more
doaj   +1 more source

Metamaterial filter for the near-visible spectrum [PDF]

, 2012
We demonstrate metamaterials operating in the near-visible regime based on two-dimensional arrays of gold-coated silicon nanopillars. The nanopillar arrays demonstrate a cutoff response at the metamaterial plasma frequency in accordance with theory and ...
Baumberg, Jeremy J., Lal, Niraj N., Butt, Haider, Wilkinson, Timothy D., Amaratunga, Gehan A J, Dai, Qing   +5 more
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The Link between Surface Visible Light Spectral Features and Water–Salt Transfer in Saline Soils—Investigation Based on Soil Column Laboratory Experiments

Remote Sensing
Monitoring soil salinity with remote sensing is difficult, but knowing the link between saline soil surface spectra, soil water, and salt transport processes might help in modeling for soil salinity monitoring.
Shaofeng Qin, Yong Zhang, Jianli Ding, Jinjie Wang, Lijing Han, Shuang Zhao, Chuanmei Zhu   +6 more
doaj   +1 more source

Visible-spanning flat supercontinuum for astronomical applications

, 2018
We demonstrate a broad, flat, visible supercontinuum spectrum that is generated by a dispersion-engineered tapered photonic crystal fiber pumped by a 1 GHz repetition rate turn-key Ti:sapphire laser outputting $\sim$ 30 fs pulses at 800 nm.
Albrecht Bartels (17493297), David F. Phillips (3961277), Andrew Szentgyorgyi (3961280), Ronald L. Walsworth (682411), Aakash Ravi (17493294), Matthias Beck (1659145), Dimitar Sasselov (632691)   +6 more
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Visible Light or Infrared? Modulating LiFi for Dual Operation in the Visible and Infrared Spectra [PDF]

, 2023
Light-Fidelity (LiFi) has emerged in the last few years as a promising technology for alleviating the stringent demand of wireless data services. Prior works have considered LiFi operating either in the visible light or infrared spectrum.
Genovés Guzmán, Borja, Frómeta Fonseca, Dayrene, Mir, Muhammad Sarmad, Giustiniano, Domenico   +3 more
core  

Visible spectrum multicore fibers with 10 and 16 cores

, 2021
We demonstrate 10- and 16-core multicore fibers with all cores operating in a single- mode with
Stalmashonak, A., Sacher, W., Poon, J. ; https://orcid.org/, Sharif Azadeh, S., Chen, F., Bennett, K.   +5 more
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Visible-Spectrum Gaze Tracking for Sports [PDF]

2013 IEEE Conference on Computer Vision and Pattern Recognition Workshops, 2013
In sports, wearable gaze tracking devices can enrich the viewer experience and be a powerful training tool. Because devices can be used for long periods of time, often outside, it is desirable that they do not use active illumination (infra-red light sources) for safety reasons and to minimize the interference of the sun.
Bernardo Rodrigues Pires, Myung Hwangbo, Michael Devyver, Takeo Kanade   +3 more
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