The actinide (ˈæktᵻnaɪd) or actinoid (ˈæktᵻnɔɪd) series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. The actinide series derives its name from the first element in the series, actinium. The informal chemical symbol An is used in general discussions of actinide chemistry to refer to any actinide. The 1985 IUPAC Red Book recommends that actinoid be used rather than actinide, since the suffix -ide normally indicates a negative ion.
HMS Ultor (P53) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness, launched in 1942, and part of the third group of the class. So far she has been the only ship of the Royal Navy to bear the name Ultor. During the Second World War, Ultor operated in the Mediterranean Sea, where she sank the French ship Penerf, the Italian auxiliary minesweeper No.
The Korean alphabet, known as Hangul (ˈhɑːnguːl ; ) in South Korea and Chosŏn'gŭl () in North Korea, is the modern official writing system for the Korean language. The letters for the five basic consonants reflect the shape of the speech organs used to pronounce them, and they are systematically modified to indicate phonetic features; similarly, the vowel letters are systematically modified for related sounds, making Hangul a featural writing system.
The Tunisia Private University (ULT) is a university in Tunis, Tunisia. It was founded in 1973 and is organized in six faculties. These are the six faculties, schools and institute in the university: Faculty of Law and Economics Faculty of Literature, Arts and Humanities Science Polytechnic Institute School of Architecture and Design School of Business International Language School (I.L.S.) ULT (Université Libre de Tunis) is the first private university created in Tunisia.