According to a new study, fly ash (leftover particles from coal-burning) constitute from 37% to 72% of all particulate organic carbon carried by the Yangtze River in China, or about 200,000 to 400,000 tons of carbon annually.
A group of researchers from the Shanghai Institute of Optics and Fine Mechanics (SIOM) of the Chinese Academy of Sciences recently came up with a new theory on the source of residual infrared absorption in Ti:sapphire laser crystals.
Chinese Academy of Sciences
Recently, a research group from Shanghai Institute of Optics and Fine Mechanics (SIOM) of the Chinese Academy of Sciences proposed a new theory on the origin of residual infrared absorption in Ti:sapphire laser crystals. The related research results have been published in Photonics Research on May 4, 2021.
Ti:sapphire (also called Ti-doped α-Al
2O
3) is one of the three basic laser crystal materials. Due to its excellent physical and chemical, spectral, and laser properties, Ti:sapphire has been one of the key materials for super-intense ultrafast laser devices.
Since the laser properties of Ti:sapphire was reported in 1982, the residual infrared absorption (with peak value around 800 nm), coincident with the laser emission band, has been the key problem affecting its laser emission efficiency. Therefore, the determination of the origin of residual infrared absorption has been a research hotspot in the community of Ti:sapphire laser crystals.
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IMAGE: Yap hadal snailfish (YHS) in situ at 6,903 m (above) and after capture (below). view more
Credit: Mu Y et al., 2021, PLOS Genetics
A new whole genome sequence for the Yap hadal snailfish provides insights into how the unusual fish survives in some of the deepest parts of the ocean. Xinhua Chen of the Fujian Agriculture and Forestry University and Qiong Shi of the BGI Academy of Marine Sciences published their analysis of the new genome May 13th in the journal
PLOS Genetics.
Animals living in deep-sea environments face many challenges, including high pressures, low temperatures, little food and almost no light. Fish are the only animals with a backbone that live in the hadal zone defined as depths below 6,000 meters and hadal snailfishes live in at least five separate marine trenches. Chen, Shi and their colleagues constructed a high-quality whole genome sequence from the Yap hadal snailfish to understand how it has adapted to life in the deep sea. The