甲烷在烃类混合溶剂中高压溶解度的测定

为了促进天然气汽车的发展和普及，选择环己烷-苯、正庚烷．环己烷和苯-正庚烷混合溶液作为溶剂，利用自建的循环法测定气体高压溶解度实验装置，测定了甲烷在上述溶剂中的高压溶解度数据（288．15～318．15K，2．00～12．00MPa）．利用Peng—Robinson状态方程计算实验数据，发现对于非极性的混合溶剂，甲烷的逸度与其溶解度成非常好的线性关系；考察了用文献中二元数据和用实验得出的三元数据计算交互作用参数对计算结果的影响，结果表明，对于非极性体系，可以用二元的气液平衡（GLE）数据估算三元GLE数据，估算结果与实验值能很好地吻合．     

Formation ages and source regions of the Palaeoproterozoic Gaofan,Hutuo and Dongjiao groups in the Wutai and Dongjiao areas of the North China Craton from SHRIMP U-Pb dating of detrital zircons: Resolution of debates over their stratigraphic relationships

This paper reports detrital zircon age distributions of meta-sedimentary rocks of the Gaofan, Hutuo and Dongjiao groups in the Wutai and Dongjiao areas of the North China Craton. Detrital zircons of a quartzite from the Gaofan Group are mainly ~2.5 Ga in age, with some ~2.7 Ga and older. A quartzite pebble from the basal conglomerate of the Hutuo Group is similar in detrital zircon age distribution to the quartzite of the Gaofan Group. For a meta-feldspar-quartz sandstone from the Dongjiao Group, the age of...