Results 41 to 50 of about 1,394,895 (334)

Biometric presentation attack detection: beyond the visible spectrum [PDF]

, 2019
The increased need for unattended authentication in multiple scenarios has motivated a wide deployment of biometric systems in the last few years. This has in turn led to the disclosure of security concerns specifically related to biometric systems ...
Busch, Christoph, Gomez Barrero, Marta, Ortega Garcia, Javier, Tolosana, Ruben   +3 more
core   +3 more sources

Palm-Vein Verification Using Images From the Visible Spectrum

IEEE Access, 2021
In this paper, we investigate into utilization of images from the visible light (RGB) spectrum for identity verification based on the palm-veins.
Sungchul Cho, Beom-Seok Oh, Donghyun Kim, Kar-Ann Toh   +3 more
doaj   +1 more source

The color of soils as a basis for proximal sensing of their composition

Бюллетень Почвенного института им. В.В. Докучаева, 2016
The color is one of the main morphological properties of soils, as it integrally reflects their material composition. Most of the macro-, micro- and nano-morphological methods in pedology are based on the analysis of soil reflectance characteristics ...
I. Yu. Savin, E. Yu. Prudnikova, N. A. Vasilyeva, I. V. Veretelnikova, A. N. Bairamov   +4 more
doaj   +1 more source

Implications of the Visible and X-Ray Counterparts to GRB970228 [PDF]

, 1997
The gamma-ray burst source GRB970228 has been observed after a delay of 8--12 hours in X-rays and after one day in visible and near infrared light. This marks the first detection of emission at lower frequencies following the gamma-ray observation of a ...
A. Guarnieri, C. Meegan, D. Palmer, E. Cohen, E. Costa, E. Costa, G. J. Fishman, J. I. Katz, J. I. Katz, J. I. Katz, J. I. Katz, K. Hurley, M. J. Rees, M. Koshut, M. Tavani, R. Sari, R. Sari, R. Sari, T. Piran, V. Connaughton   +19 more
core   +2 more sources

Multilayer Metamaterials with Vertical Cavities for High-Efficiency Transmittance with Metallic Components in the Visible Spectrum

Photonics
Metasurfaces are opening promising flexibilities to reshape the wavefront of electromagnetic waves. Notable optical phenomena are observed with the tailored surface plasmon, which is excited by metallic components in the visible spectrum.
Huiyu Li, Lin Zhao, Guangwei Chen, Guoqing Hu, Zhehai Zhou   +4 more
doaj   +1 more source

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

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

Collisional-Radiative Model for the visible spectrum of $W^{26+}$ ions

, 2015
Plasma diagnostics in magnetic confinement fusion plasmas by using visible spectrum strongly depends on the knowledge of fundamental atomic properties. A detailed collisional-radiative model of W$^{26+}$ ions has been constructed by considering radiative
Ding, Xiaobin, Dong, Chenzhong, Kato, Daiji, Koike, Fumihiro, Liu, Jiaxin, Murakami, Izumi, Nakamura, Nobuyuki, Sakaue, Hiroyuki A   +7 more
core   +1 more source

TRNG (True Random Number Generator) Method Using Visible Spectrum for Secure Communication on 5G Network

IEEE Access, 2018
The key point of cryptography is cryptographic algorithms and keys. The random number generator is used to generate seeds and keys randomly in many cryptographic systems.
Kyungroul Lee, Sun-Young Lee, Changho Seo, Kangbin Yim   +3 more
doaj   +1 more source

The Visible Spectrum [PDF]

, 1994
Today, the national environmental movement is entering a new phase, led by new players, just as the still young environmental protection movement is becoming more politically influential at the local level.
Anderson, Ph.D, Nancy E.
core   +1 more source