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- Dictionaryspectral/ˈspɛktr(ə)l/
adjective
- 1. of or concerning spectra or the spectrum.
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1 day ago · Stellar classification. In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines.
1 day ago · Optogenetics. Optogenetics is a biological technique to control the activity of neurons or other cell types with light. This is achieved by expression of light-sensitive ion channels, pumps or enzymes specifically in the target cells. On the level of individual cells, light-activated enzymes and transcription factors allow precise control of ...
1 day ago · The centimetre ( SI symbol: cm) is a unit of length in the metric system equal to 10−2 metres ( 1 100 m = 0.01 m ). To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimetres. 1 cm – 0.39 inches. 1 cm – edge of a square of area 1 cm 2.
47 minutes ago · Numerous spectral indices based on satellite imagery are available for depicting water bodies. Several remote sensing indices are employed for extracting water bodies, such as NDWI by McFeeters , MNDWI by Xu , Water Ratio Index (Shen and Li 2010), AWEI (Feyisa et al. 2014), among others. These indices are also used for mapping wetlands from ...
1 day ago · This year, the important trend in the field of large-screen display in the home theater market is still 8K ultra-high definition, especially in terms of signal source equipment, more and more brands have begun to bring ...
1 day ago · Phosphorus. Phosphorus is a chemical element; it has symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth. It has a concentration in the Earth's crust of about one gram per kilogram (compare ...
1 day ago · Cats are common pets throughout the world, and their worldwide population as of 2007 exceeded 500 million. [199] As of 2017, the domestic cat was the second most popular pet in the United States, with 95.6 million cats owned [200] [201] and around 42 million households owning at least one cat. [202]
