The irradiation history of the Ghubara (L5) regolith breccia
摘要:
Abstract— We measured cosmic‐ray products—noble gases, radionuclides, thermoluminescence, and nuclear tracks—and trace element contents and mineralogy of samples of three orthogonal and mutually intersecting cores (41–46 cm long) of a 101.6 kg Ghubara individual (1958,805) at The Natural History Museum, London. The xenoliths, like the host, have high concentrations of trapped solar gases and are heavily shocked. While contents of noble gases and degree of shock‐loading in this individual and three others differ somewhat, the data indicate that Ghubara is a two‐generation regolith breccia. Contents of cosmogenic 26Al and 10Be and low track densities indicate that the Ghubara individuals were located more than 15 cm below the surface of an 85 cm meteoroid. Because of its large size, Ghubara's cosmic‐ray exposure age is poorly defined to be 15–20 Ma from cosmogenic nuclides. Ghubara's terrestrial age, based on 14C data, is 2–3 ka. Not only is Ghubara the first known case of a two‐generation regolith breccia on the macroscale, it also has a complicated thermal and irradiation history.
作者:M. V. Mavrov、�. S. Voskanyan、T. A. Severina、V. F. Kucherov
DOI:10.1007/bf00862213
日期:1971.5
ETHYLENICALLY UNSATURATED GROUP-CONTAINING ISOCYANATE COMPOUND AND PROCESS FOR PRODUCING THE SAME, AND REACTIVE MONOMER, REACTIVE (METH)ACRYLATE POLYMER AND ITS USE
申请人:SHOWA DENKO K.K.
公开号:EP1812381B1
公开(公告)日:2011-02-16
Ethylenically Unsaturated Group-Containing Isocyanate Compound and Process for Producing the Same, and Reactive Monomer, Reactive (Meth) Acrylate Polymer and its Use
申请人:Nozawa Kaneo
公开号:US20080132597A1
公开(公告)日:2008-06-05
There are provided a novel ethylenically unsaturated group-containing isocyanate compound, a process for producing the same, and a reactive monomer produced from the isocyanate compound, a reactive polymer and its use. The ethylenically unsaturated group-containing isocyanate compound according to the present invention is represented by formula (I).