U isotope variations in CAIs: Implications for the age of the Solar System

U Isotopic Composition in Meteoritic Phosphate

U Moyen D'essais Economique et D'acces Aise EN Microgravite: la Caravelle Zero-G

U Ophiuchi: an Eclipsing Binary with Rapid Apsidal Motion

U Pb ages and source composition by Hf-isotope and trace-element analysis of detrital zircons in Permian sandstone and modern sand from southwestern Australia and a review of the paleogeographical and denudational history of the Yilgarn Craton

U Pb ages and source composition by Hf-isotope and trace-element analysis of detrital zircons in Permian sandstone and modern sand from southwestern Australia and a review of the paleogeographical and denudational history of the Yilgarn Craton

U Pb ages of angrites

U Pb and Hf isotopic study of detrital zircons from the Wulashan khondalites: Constraints on the evolution of the Ordos Terrane, Western Block of the North China Craton

U Pb and Lu Hf isotope record of detrital zircon grains from the Limpopo Belt Evidence for crustal recycling at the Hadean to early-Archean transition

U Pb and Lu Hf isotopic constraints on the provenance of Permian detritus in metasedimentary rocks of Southern Chile and Livingston Island, Antarctica

U Pb dating of enamel from the Swartkrans Cave hominid site (South Africa) by MC-ICP-MS

U Pb dating of speleothems from Sterkfontein Cave, South Africa

U Pb SHRIMP dating of zircons from the ore-bearing Kharaelakh intrusion (Talnakh district, Russia)

U Pb SHRIMP geochronology of Th-poor, hydrothermal monazite: An example from the Llallagua tin-porphyry deposit, Bolivia

U Pb zircon dating on the granitic conglomerates of the Hutuo Group: Affinities to the Wutai Granitoids and significance on the tectonic evolution of the Trans-North China Orogen

U Pb zircon geochronology of the end-Permian mass extinction

U Piscis Austrini--An RR Lyrae Type Variable

U Sco in outburst

U Scorpii as a Recurrent Nova

U Sr isotopic speedometer: Fluid flow and chemical weathering rates in aquifers