All articles starting with U
6,146 articles
Unidentified Flying Oddball
Unidentified Flying Oddball, also released as The Spaceman and King Arthur, is a 1979 Walt Disney Productions sci-fi comedy directed by Russ Mayberry, loosely adapting Mark Twain's A Connecticut Yankee in King Arthur's Court, with astronaut Tom Trimble and his android Hermes in Camelot.
Unidentified infrared emission bands
The unidentified infrared emission bands, also called the aromatic infrared bands, are broad emission features at 3.3 to 12.7 micrometers generally attributed to PAH molecules excited by ultraviolet light.
Unidirectional invisibility
Unidirectional invisibility is a one-way scattering phenomenon where an object is transparent to waves from one direction yet reflects or scatters them from the opposite side.
Unidirectional spin Hall magnetoresistance
Unidirectional spin Hall magnetoresistance (USMR) is a nonlinear effect in heavy metal and ferromagnet bilayers whose resistance changes sign when current or magnetization is reversed, first reported in 2015.
Unidisc Music
Unidisc Music (Unidisc Music Inc.), Canadian independent disco and dance label founded 1977 in Montreal by DJ George Cucuzzella; over 17,000 licensed titles, acquired catalogs like Prelude and Sutra, Pointe-Claire headquarters, and the 2021 Quebec master-tapes tax case.
UniEnergy Technologies
UniEnergy Technologies (UET) was a Mukilteo, Washington company founded in 2012 that made vanadium redox flow batteries for utility-scale energy storage; it went bankrupt in 2021.
UNIFAC
UNIFAC (UNIQUAC Functional-group Activity Coefficients) is a group-contribution method that predicts activity coefficients and phase equilibria of non-electrolyte liquid mixtures from the functional groups composing the molecules, introduced in 1975.
Unife (TV channel)
Unife (UNIFE TV) is a family television channel of the Iglesia Universal del Reino de Dios, launched in Argentina in 2019, aired in Mexico City on channel 8.3 since January 2023 and in Portugal since August 2022.
Unification (computer science)
Unification in computer science is the algorithmic problem of finding a substitution making two logical expressions identical, introduced by Robinson in 1965 for resolution theorem proving.
Unification Church (통일교)
The Unification Church (통일교), also called the Unification Movement, is a Korean new religious movement founded in Seoul in 1954 by Moon Sun-myung, known for mass weddings.
Unification Church of the United States
The Unification Church of the United States, also known as the Unification Church of America, is the American branch of Sun Myung Moon's movement, founded in 1954.
Unification of Egypt
The unification of Egypt, also called the unification of Upper and Lower Egypt, joined the two lands under one king around 3100 BC, associated with Narmer and Menes.
Unification of Egypt by Psamtik I
The unification of Egypt by Psamtik I ended the Third Intermediate Period, as the Saite king of Sais defeated rival Delta rulers and secured Thebes by 656 BC.
Unification of Germany
Unification of Germany (Deutsche Reichsgruendung): creation of the German Empire under Prussian leadership, 1864-1871, via wars against Denmark, Austria, and France; proclaimed at Versailles January 18, 1871, excluding Austria and annexing Alsace-Lorraine.
Unification of Hawaii
The unification of Hawaii was the conquest of the Hawaiian Islands under Kamehameha I between 1782 and 1810, when Kauaʻi's chief acknowledged his supremacy, founding the Kingdom of Hawaiʻi.
Unification of Italy
Unification of Italy (Risorgimento): the 1859-1870 process fusing the peninsula's states into the Kingdom of Italy, proclaimed 17 March 1861 under Savoy, completed with Rome in 1870; Cavour's diplomacy, Garibaldi's Thousand, and war against Austria.
Unification of Japan by Toyotomi Hideyoshi
The unification of Japan by Toyotomi Hideyoshi (豊臣秀吉) was the process by which, between 1582 and 1590, Hideyoshi brought all of Japan under one regime, ending the Sengoku wars.
Unification of Moldavia and Wallachia
The unification of Moldavia and Wallachia (Unirea Principatelor Române) was the 1859 union of the two Danubian principalities under Alexandru Ioan Cuza, foundation of modern Romania.
Unification of Moldova and Romania
Unification of Moldova and Romania (Unirea): proposed political merger of the Republic of Moldova with Romania, recalling the 1918 Bessarabian union; blocked by Transnistria, Gagauzia, and neutrality, with Moldovan polling divided (44-61% pro) and Romanian support high.
Unification of Ryukyu by Shō Hashi
The unification of Ryukyu by Shō Hashi (尚巴志, 1372–1439) joined Okinawa Island's three kingdoms, Hokuzan, Chūzan, and Nanzan, into one Ryukyu Kingdom, founded under the First Shō dynasty in 1429 and ruled from Shuri Castle.
Unification of Saudi Arabia (توحيد المملكة العربية السعودية)
Unification of Saudi Arabia (توحيد المملكة العربية السعودية): Abdulaziz bin Abdulrahman Al Saud's 1902–1932 campaigns from the recapture of Riyadh to the September 23, 1932 royal decree naming the Kingdom of Saudi Arabia.
Unification of the Buyid emirate by 'Adud al-Dawla
The unification of the Buyid emirate by 'Adud al-Dawla, achieved after defeating his cousin 'Izz al-Dawla Bakhtiyar, joined Fars and Iraq under one ruler until his death in 983.
Unification of the Later Three Kingdoms
The Unification of the Later Three Kingdoms (후삼국 통일) was the process by which Goryeo absorbed Silla peacefully in 935 and defeated Later Baekje in 936, reunifying Korea.
Unification of the Northern and Southern Courts
The Unification of the Northern and Southern Courts (南北朝合一), formally the Meitoku peace agreement, ended Japan's civil war in 1392 when Emperor Go-Kameyama ceded the regalia to Emperor Go-Komatsu.
Unification of the Three Kingdoms
The Unification of the Three Kingdoms (samguk tongil) was the Korean kingdom Silla's destruction of Baekje in 660 and Goguryeo in 668 with Tang aid, then expulsion of Tang forces by 676.
Unified cell
The Unified Cell is a standardized prismatic lithium-ion battery cell developed by PowerCo, Volkswagen's battery subsidiary, announced in 2021 and entering production at Salzgitter, Germany in December 2025.
Unified combatant command
Unified combatant commands are the 11 joint US military commands (6 geographic, 5 functional, e.g. INDOPACOM, EUCOM, SOCOM, STRATCOM) with broad continuing missions under Title 10, commanded via the President–SecDef chain under the Unified Command Plan.
Unified communications
Unified communications (UC) is the integration of enterprise communication tools such as voice calling, video conferencing, instant messaging, presence, and content sharing into a single streamlined interface, improving productivity.
Unified Diagnostic Services
Unified Diagnostic Services (UDS) is an automotive diagnostic communication protocol in the ISO 14229 series, used to read fault codes, control actuators, and reprogram ECUs.
Unified field theory
A unified field theory, also called a unified force theory, describes fundamental forces as aspects of a single field; Einstein pursued one, and electroweak unification succeeded.