双(3-乙基-5-甲基-4-马来酰亚胺基苯基)甲烷,分子式:C27H26N2O4,熔点165℃,沸点618.742°C at 760 mmHg,折射率:1.633,密度:1.269g/cm3,白色到淡黄色粉末,可作为医药中间体、材料中间体等研究用化合物。为检测双(3-乙基-5-甲基-4-马来酰亚胺基苯基)甲烷中的多种金属元素含量,选择微波消解对其进行前处理,探索最适合的消解参数,该方法还有回收率高、空白低等特点,有利于后续对多种无机元素的快速准确测定。
The unsteady organization and temporal dynamics of the interaction between a planarshock wave impinging on a turbulent boundary layer at a free stream Mach number ofM∞ =1.69 is investigated experimentally by means of dual-plane Particle Image Velocimetry(dual-PIV). Two independent PIV systems were combined in two component mode to obtaininstantaneous velocity fields separated by a prescribed small time delay. This enables toobtain, in addition to mean and statistical flow properties, also instantaneously time resolveddata to characterize the temporal dynamics of the flow phenomenon in terms of time scales,temporal correlations and convective velocities. The characteristic time scales for theincoming boundary layer, the separation region and the reflected shock are evaluated bymeans of measuring the temporal auto-correlation coefficient in the complete flow field for arange of time delays from 5 ms to 2000 ms. These auto-correlation fields are used to quantifythe time scales in selected regions of the flow. This permits resolving the dominant timescales within the boundary layer and the interaction region.I. Introduction