Results 21 to 30 of about 452,180 (309)

Computer vision techniques for modelling the roasting process of coffee (Coffea arabica L.) var. Castillo

open access: yesCzech 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]

open access: yesFrontiers 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

open access: yesNanophotonics, 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

Advances in Droplet-Based Microfluidic High-Throughput Screening of Engineered Strains and Enzymes Based on Ultraviolet, Visible, and Fluorescent Spectroscopy

open access: yesFermentation, 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]

open access: yesEPJ 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

open access: yesRemote 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

open access: yesCrystals, 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

open access: yesPediatric 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

open access: yesIEEE 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

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