在不稳定的流动状态下，气体的径向浓度分布曲线两边出现不对称。
In the unstable flow the radial distribution of tracer gas concentration is asymmetry.
研究了PVB本体浓度、制膜间隙、凝胶浴温度以及乙酸添加剂等因素对PVB不对称超滤膜性能的影响；
Effects of concentration of PVB, clearance of scraper, temperature of gelling bath and concentration of acetic acid additive on membrane performance were investigated.
同时发现COBE的浓度和产物对不对称还原都有一定负面的影响。
And it was found that the concentration of COBE and product had some degree negative effect on the asymmetric reduction.
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