Earth's oxygen levels rose and fell more than once hundreds of millions of years before the planetwide success of the Great Oxidation Event about 2.4 billion years ago, new research shows. Earth's ...
Presented at the 2011 International Conference on Hot Isostatic Pressing Kobe, Japan, 12-14 April 2011. Three kinds of TiN porous ceramics with different relative density (SN1: 87 %; SN2: 66 %; SN3: ...
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