The color of hot objects, such as stars, can be used to estimate theirtemperatures, according to IDEA. For example, the sun's surface temperature is about 5,800 kelvin (9,980 F or 5,527 C). The light emitted has a peak wavelength of about 550 nm, which we perceive as visible white...
aenergy depend on the frequency. For example, visible light has a frequency between 能量取决于频率。 例如,可见光有一个频率之间[translate]
根据For example, ultraviolet B (UV-B) rays tell human skin to make vitamin D. 例如,紫外线B(UV-B)可以让人体皮肤产生维生素D。可以推知维生素D对我们的身体有好处。故选B。 (2) 词义猜测题。根据Some scientists think that powerful UV rays could have bleached all the colorful flags white by now...
Like visible light,UV rays are energy waves released by the sun,only they cannot been seen. Some exposure (暴露) to those waves can do a body good. For example, ultraviolet B(UV-B)rays tell human skin to make vitamin D. Too much exposure can be harmful, though. Overexposure to UV ra...
A PLC modem performs communication via transmission lines made of a pair of cables as an example of a wired transmission line. Data displaying an operation state of the PLC modem is transmitted to a light emitting part via a modulator, and is converted into a high-speed flash signal for out...
Visible light–excitable Ca2+ indicators offer several advantages over UV light–excitable indicators: Efficient excitation with most laser-based instrumentation, including confocal laser-scanning microscopes and flow cytometers Stronger absorption by ...
Visible-light and infrared face recognition 来自 ResearchGate 喜欢 0 阅读量: 109 作者:X Chen,PJ Flynn,KW Bowyer 摘要: This study examines,issues involved in the comparison and combination,of face recognition using visible and infra-red images. This is the only study that we know of to focus...
LED streetlights could even be used to form a network of outdoor Li-Fi, making it possible to stay connected when walking around the city.But some sound a cautious note about VLC’s future. It becomes less powerful , for example,when light is blocked, wheather due to fog or other ...
1. IntroductionVisible Light Communication (VLC) is a creative approach for novel mobile applications. Games, toys, location services, and aug- mented reality are example applications that can benefit from using visible light for communication. In the following, we address VLC applications for consum...
The visible spectrum refers to the portion of the electromagnetic spectrum ranging from approximately 380 nm to 780 nm, where light of different wavelengths is perceived as different colors by the human eye. AI generated definition based on: AZimuth, 1998 ...