Ultrasonic characterisation data of asphaltenes E1-E4

Ultrasonic velocity characterisation measurements of the E1, E2, E3 and E4 asphaltenes. In every file, the columns include asphaltene concentration, mean velocity measurement and standard deviation of every velocity measurement.本数据集记录了E1、E2、E3及E4类沥青质的超声波速度表征测量数据。每份文件中包含沥青质浓度、平均速度测量值及其标准偏差。