All articles starting with U

Uralkali (Уралкалий)

Uralkali is a Russian producer and exporter of potassium chloride fertilizer with mines at Berezniki and Solikamsk in the Perm Region, producing a record 12.9 million tonnes in 2024.

Urals crude

Urals crude is Russia's primary export crude oil blend, a medium sour grade named after the Ural Mountains and priced in world markets at a differential to Brent.

Uralvagonzavod

Uralvagonzavod (Уралвагонзавод) is a Russian heavy machinery complex in Nizhny Tagil that builds railway freight cars and armored fighting vehicles, including the T-72 and T-14 Armata.

Urambo

Urambo was a nineteenth-century Nyamwezi state in western Unyamwezi, in present-day west-central Tanzania, built by the war-leader Mirambo and centered on the town of Urambo.

Uran (उरण) is a coastal town on Karanja island in Raigad district, Maharashtra, part of Navi Mumbai; former Portuguese fort site, old salt pans, Deulwadi temple quarter, and home of Jawaharlal Nehru Port; 2011 town population 30,439.

Uran-9

The Uran-9 (Уран-9) is a Russian tracked, remotely controlled combat robot for reconnaissance and fire support, tested in Syria in 2018 and reportedly entering service in 2019.

Urania's Mirror

Urania's Mirror; or, a View of the Heavens: boxed set of 32 pierced, hand-colored constellation cards published by Samuel Leigh, London, November 1824, engraved by Sidney Hall, designed by Rev. Richard Rouse Bloxam, based on Jamieson's Celestial Atlas.

Uranian (sexuality)

Uranian (German Urning), coined by Karl Heinrich Ulrichs in 1864, is a nineteenth-century term for same-sex-desiring people, drawn from Plato's Symposium via Aphrodite Urania; distinct from Kertbeny's later "homosexual" and the British Uranian poets' pederastic usage.

Uranians

The Uranians were a loosely knit group of British and American homosexual poets active about 1880-1930, named by Timothy d'Arch Smith in Love in Earnest (1970), drawing on Pater, Whitman, and ancient Greek homoerotic motifs.

Oct 21, 2026

Uraniidae

Uraniidae, commonly called swallowtail moths, is a family of about 700 moth species found mostly in the tropics, including large, diurnal, iridescent moths that resemble swallowtail butterflies.

Uraninite

Uraninite, also known as pitchblende, is a radioactive uranium oxide mineral (UO₂) and the most important ore of uranium, from which Marie and Pierre Curie isolated polonium and radium in 1898.

Uranium

Uranium is a naturally occurring, weakly radioactive silvery metal of the actinide series, atomic number 92, discovered in 1789 by Martin Heinrich Klaproth and used chiefly as nuclear reactor fuel.

Uranium carbide

Uranium carbide, best known as uranium monocarbide (UC), is a ceramic compound of uranium and carbon studied as nuclear reactor fuel for its high uranium density and thermal conductivity.

Uranium City

Uranium City is a northern Saskatchewan settlement on Lake Athabasca, built in 1952 to service Eldorado's Beaverlodge uranium mines, peaked near 4,600 people, and declined after the 1982 mine closure.

Uranium dioxide

Uranium dioxide (UO₂) is a black ceramic oxide of uranium, found naturally in the mineral uraninite, that serves as the standard fuel for most commercial nuclear power reactors.

Uranium ditelluride

Uranium ditelluride (UTe2) is a heavy-fermion compound of uranium and tellurium that superconducts at 1.6 K and is the leading candidate for rare spin-triplet superconductivity.

Uranium Energy Corp

Uranium Energy Corp is a United States uranium mining company headquartered in Corpus Christi, Texas, listed on NYSE American as UEC and using in-situ recovery mining in Wyoming and South Texas.

Uranium enrichment

Uranium enrichment is the physical process of increasing the proportion of the fissile isotope uranium-235 in uranium, most often to make fuel for nuclear reactors and weapons.

Uranium extraction from seawater

Uranium extraction from seawater (UES) recovers dissolved uranium from ocean water, which holds about 4.5 billion tons, mostly by adsorption onto amidoxime adsorbents, though costs still exceed terrestrial mining.

Uranium glass

Uranium glass, often called Vaseline glass, is glass colored by adding uranium, usually as uranium oxide, to the molten batch, glowing bright green under ultraviolet light. It was invented in Bohemia in the 1830s.

Uranium hexafluoride

Uranium hexafluoride (UF₆) is a volatile uranium compound, first synthesized around 1900, that serves as the industry-standard feedstock for uranium enrichment, which raises the fraction of fissile uranium-235.

Uranium mill tailings

Uranium mill tailings are the sandy waste left after a uranium mill extracts uranium from ore, containing radium-226 and thorium-230 and regulated under the 1978 UMTRCA.

Uranium Mill Tailings Radiation Control Act

The Uranium Mill Tailings Radiation Control Act of 1978 is a United States federal law that established programs to stabilize and regulate uranium mill tailings at active and inactive mill sites.

Uranium Mill Tailings Remedial Action program

The Uranium Mill Tailings Remedial Action (UMTRA) program is a U.S. Department of Energy program that cleaned up abandoned uranium mill tailings sites under the 1978 UMTRCA.

Uranium mining

Uranium mining, the extraction of uranium ore from uranium mines, is the first stage of the nuclear fuel cycle, supplying reactors and, historically, nuclear weapons programs.

Uranium molybdenum alloy

Uranium molybdenum alloy (U-Mo) is a metallic nuclear fuel, about 7 to 10 percent molybdenum, developed for converting research and test reactors to low-enriched uranium.

Uranium nitride

Uranium nitride is a compound of uranium and nitrogen, known chiefly as uranium mononitride (UN), a leading candidate fuel for advanced nuclear reactors, and as molecular complexes.

Uranium One

Uranium One is a Canadian-based uranium mining company that came under full ownership of Russia's Rosatom by 2013, after a 2010 deal approved by CFIUS.

Uranium ore

Uranium ore is rock with uranium concentrated enough for economic extraction, mined by open pit, underground, and in situ leaching methods, then milled into yellowcake for nuclear fuel.