Saturated hydrocarbon fractions of free oil , sealing oil and bound oil , which are extracted from six oil sands of yanchang formation in xifeng oilfield of northwestern ordos basin , northwest china , have been analyzed by gc / msd ( 6890n / 5973n ) in order 摘要对鄂尔多斯盆地西峰油田三叠系延长组六个油砂样品中游离烃、封闭烃、束缚烃的饱和烃馏分进行了gc - ms分析。
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A developed measuring system and test method of green sand properties are introduced . by means of measuring the standard molding sand specimens , the dynamic curves of stress - strain can be quickly and accurately plotted out and several parameters , which represent the characteristics of molding sand , can be tested during the process of compressive deformation . in this brand new method of property measurement two new concepts of viscoelastic parameter and plastic deformation threshold are put forward 介绍了一种研制的型砂性能检测系统与测试方法，通过对标准砂样的测试，能迅速、准确地测得砂样受载过程中的应力应变的动态关系曲线及反映型砂本质特征的几项性能参数，这是型砂性能检测领域中的新探索，其中型砂粘弹性指标及塑性变形临界值乃是型砂性能方面的新概念。
