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Dasycladalean calcified green algae are common in the Phanerozoic, and have been reported from various lagoons and other environments of post‐Ordovician periods. There is a paucity of studies exploring palaeoecology of Ordovician dasycladaleans. Based on examination of 1,089 large thin sections from the Upper Ordovician Lianglitag Formation in 12 drilling wells in the Tarim Basin, Xinjiang, China,...
Systematic studies of synthesizing behaviors of sol-gel YBa2Cu3O7−x samples in flowing oxygen atmosphere and their superconductivity have been performed. A set of high temperature ρ-T curves has been obtained for the whole synthesizing process. After four rounds of synthesizing, the resistivity of the sample was around ρ=1.00×10−3Ω · cm at room temperature. The ρ-T curve of the fourth round shows...
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