All articles starting with Y
4,654 articles
Ytterbium-doped fiber
Ytterbium-doped fiber is an optical fiber whose core is doped with ytterbium ions to amplify light, the dominant gain medium for high-power fiber lasers operating near 1 µm.
Ytterbium-doped fiber amplifier
A ytterbium-doped fiber amplifier (YDFA) is an optical amplifier whose gain medium is ytterbium-doped optical fiber, pumping light near 1 µm and powering kilowatt-class fiber lasers.
Ytterbium-ion quantum computing
Ytterbium-ion quantum computing is an approach that stores qubits in hyperfine states of trapped ytterbium-171 ions, controlled with lasers or microwaves, offering high-fidelity gates and long coherence.
Ytterbium(III) chloride
Ytterbium(III) chloride, or YbCl3, is a hygroscopic white paramagnetic lanthanide salt used as a Lewis acid, a precursor in organolanthanide chemistry, and a dehalogenation catalyst.
Ytterby
Ytterby (Ytterby gruva) is a village on Resarö, Vaxholm, Stockholm archipelago, whose quarry yielded yttrium, ytterbium, terbium, and erbium; distinct from Ytterby suburbs in Kungälv and a village in Åland.
Yttria-stabilized zirconia
Yttria-stabilized zirconia (YSZ) is a ceramic solid solution of yttria in zirconia whose oxygen vacancies enable fast ion conduction, making it the standard electrolyte in solid oxide fuel cells.
Yttrium
Yttrium is a chemical element with symbol Y and atomic number 39, a silvery metal grouped with the rare earths and used in phosphors, lasers, and superconductors.
Yttrium aluminium garnet
Yttrium aluminum garnet (YAG) is a synthetic cubic garnet oxide grown as crystals and ceramics, used in lasers like Nd:YAG, white LED phosphors, optical windows, and gas-turbine thermal barrier coatings.
Yttrium barium copper oxide
Yttrium barium copper oxide (YBCO) is a ceramic superconductor with a critical temperature near 92 K, the first to work above liquid nitrogen's boiling point.
Yttrium hexahydride
YH6 (yttrium hexahydride) is a high-pressure clathrate superhydride, predicted in 2015 and synthesized in 2021 with a superconducting transition at about 224 K and 166 GPa.
Yttrium hydride
Yttrium hydride (YHx) is a family of compounds formed when hydrogen occupies sites in the yttrium metal lattice, ranging from YH2 to YH3, used in microreactors and superconductivity research.
Yttrium iron garnet
Yttrium iron garnet (YIG, Y3Fe5O12) is a synthetic ferrimagnetic insulating oxide with the lowest magnetic damping of any known material, the standard material for microwave devices since the 1960s.
Yttrium orthovanadate
Yttrium orthovanadate (YVO₄) is a synthetic birefringent crystal with a tetragonal zircon-type structure, used in fiber-optic polarizing components and, when doped with neodymium, as a laser gain medium.
Yttrium oxide
Yttrium oxide, also called yttria, is a white, air-stable rare-earth oxide used in ceramics, phosphors, and lasers. Johan Gadolin isolated it in 1794 from minerals mined at Ytterby, Sweden.
Yttrium superhydride
Yttrium superhydrides are hydrogen-rich compounds of yttrium, principally YH₆ and YH₉, that superconduct only above 160 GPa in a diamond anvil cell, with critical temperatures up to 243 K in YH₉, second only to LaH₁₀.
Yttrium-90
Yttrium-90 is a radioactive isotope of yttrium with a half-life of 64.1 hours that decays by beta emission to zirconium-90 and is used to treat cancer.
Yū Aoi (蒼井優)
Yū Aoi, also known as Aoi Yuu, is a Japanese actress from Fukuoka Prefecture who debuted in the musical Annie at age 14 and won the Japan Academy Prize for Hula Girls.
Yu Awu
Yu Awu (虞阿五, born 1941) is a Chinese jewelry manufacturer who founded the Ming Jewelry factory in Shaoxing, Zhejiang, in 1987 and chairs its listed company.
Yu Chaoen
Yu Chaoen (鱼朝恩) was a Tang dynasty eunuch official, the first Army Overseer and commander of the Shence Army, strangled on Emperor Daizong's orders in 770.
Yu Chengen (余承恩)
Yu Chengen (余承恩, Chengen Yu) is a mainland Chinese actor born 1998 in Wuhan, a Central Academy of Drama dance drama graduate who debuted via Produce Camp 2019 and is known for Demo in Go Go Squid!, Lou Yao in Love Like the Galaxy, and Situ Ling in Ru Qing Yun.
Yu Cheon-u
Yu Cheon-u (유천우, 1209–1276) was a Goryeo civil official who rose as a retainer of the military ruler Choe U and became Chancellor of the Secretariat.
Yu Chi-hwan
Yu Chi-hwan (유치환, 1908–1967) was a South Korean poet who wrote under the pen name Cheongma, publishing more than 160 poems and twelve collections, best known for "Flag".
Yu Dafu
Yu Dafu (郁达夫) was a Chinese novelist, essayist, and poet born in Fuyang, Zhejiang, in 1896 who co-founded the Creation Society and disappeared in Japanese-occupied Sumatra in 1945.
Yu Dan (business executive)
Yu Dan (于丹) is a Chinese internet executive and CEO of Huafang Group, the live-streaming company behind Huajiao Live, listed in Hong Kong in 2022.
Yu Darvish (ダルビッシュ 有)
Yu Darvish (ダルビッシュ有), born in Osaka in 1986, is a Japanese starting pitcher who starred in NPB and pitched for four MLB teams including the Rangers and Padres.
Yu Dayou
Yu Dayou (俞大猷) was a Ming dynasty general who fought wokou pirates and coastal rebels for four decades under the Jiajing, Longqing, and Wanli emperors, from 1503 to 1579.
Yu Dayou's Naval Forces
Yu Dayou's naval forces (俞大猷水军) were Ming-dynasty coastal squadrons led by general Yu Dayou against wokou pirates, fighting from Fujian to Guangdong during the Jiajing reign.
Yu Deng (邓煜)
Yu Deng (邓煜) is a Chinese mathematician and professor at the University of Chicago who rigorously derived the Boltzmann equation from hard-sphere dynamics, winning the 2026 Fields Medal.
Yu Deuk-gong
Yu Deuk-gong (유득공, 1748–1807) was a Korean scholar-official of late Joseon and a Northern Learning (Bukhak) historian who wrote the first systematic history of the Balhae kingdom.
Yu Dunde
Yu Dunde (于敦德), born in 1981, is a Chinese entrepreneur who founded the Nanjing-based online travel agency Tuniu in 2006 and leads it as chairman and CEO.