正交设计筛选胃肠止血颗粒剂中游离大黄素的最佳提取工艺，用反相ＨＰＬＣ法测定，色谱柱系ＺｏｒｂａｘＯＤＳ柱，（４．６ｍｍ×２５０ｍｍ），流动相为甲醇－水（８０：２０），流速１．０ｍｌ／ｍｉｎ，紫外检测波长２５４ｎｍ，室温操作，测......

对油泵房真空系统不合理工艺进行了剖析，并就加强油库工艺菅理提出建设性意见。...

Rare earth elements (REEs), especially heavy rare earth elements (HREEs), are in demand for their current and emerging a......

The present study aims to reveal the contributing factors for train delays in Tokyo metropolitan area by conducting stat......