Results 21 to 30 of about 452,180 (309)
Optimized 2D array of thin silicon pillars for efficient antireflective coatings in the visible spectrum. [PDF]
Sci Rep, 2016 Proust J +4 more
europepmc +2 more sources
Czech Journal of Food Sciences, 2020 Artificial vision has wide-ranging applications in the food sector; it is easy to use, relatively low cost and allows to conduct rapid non-destructive analyses. The aim of this study was to use artificial vision techniques to control and model the coffee
Eugenio Ivorra +2 more
doaj +1 more source
Achromatic Varifocal Metalens for the Visible Spectrum [PDF]
Frontiers in Optics + Laser Science APS/DLS, 2019 Metasurface optics provide an ultra-thin alternative to conventional refractive lenses. A present challenge is in realizing metasurfaces that exhibit tunable optical properties and achromatic behavior across the visible spectrum. Here, we report the design, fabrication, and characterization of metasurface lenses ("metalenses") that use asymmetric TiO2 ...
John D. Perreault +8 more
openaire +5 more sources
Ultralow loss visible light metamaterials assembled by metaclusters
Nanophotonics, 2022 Optical metamaterials give birth to the control and regulation of light. However, because of strong energy dissipation and fabrication difficulty in meta-atoms, low-loss isotropic three dimensional negative index metamaterials (NIMs) in the visible ...
Zhao Jing +10 more
doaj +1 more source
Fermentation, 2023 Genetic engineering and directed evolution are effective methods for addressing the low yield and poor industrialization level of microbial target products.
Shunyang Hu +5 more
doaj +1 more source
Graphene/4H-SiC Schottky photodetector operating in the visible spectrum range [PDF]
EPJ Web of Conferences, 2023 In this work, we present the first experimental results on a Schottky photodetector based on Silicon Carbide (SiC) and Graphene (Gr) designed to operate in the visible spectral range.
Mallemace Elisa D. +6 more
doaj +1 more source
The Use of UAV Mounted Sensors for Precise Detection of Bark Beetle Infestation
Remote Sensing, 2019 The bark beetle (Ips typographus) disturbance represents serious environmental and economic issue and presents a major challenge for forest management. A timely detection of bark beetle infestation is therefore necessary to reduce losses.
Tomáš Klouček +5 more
doaj +1 more source
Characterization of Red, Pink, Orange, and Purple Gem-Quality Spinel from Four Important Areas
Crystals, 2023 Spinel is a precious stone with a long history. In ancient societies spinel was considered to be an imitation of ruby. With the depletion of ruby mineral resources, gem—grade spinel has attracted more and more attention from consumers. In the last decade,
Qian Xu, Bo Xu, Yujie Gao, Siying Li
doaj +1 more source
Optical Filters for TV-Induced Photosensitive Epilepsy
Pediatric Neurology Briefs, 2001 Two different types of optical filters were tested in 20 photosensitive epileptic patients for ability to inhibit photoparoxysmal response (PPR) and seizures, in a study at Gifu Prefectural Gifu Hospital, Japan.
J Gordon Millichap
doaj +1 more source
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 +3 more
doaj +1 more source