concentration fluctuations meaning in English

浓度起伏

Additionally , more modest dopamine concentration fluctuations , related to punishment and movement , are seen at 200 - 18000 times longer time courses using voltammetry and microdialysis in vivo
另外，更适度的多巴胺浓度涨落与处罚和运动有关系，活体内用伏安法和微量透析可把时程延长200 - 18000倍。
Secondly , for the first time , by volume average concept and reynolds time - average method , a 3d quasi - single phase mass transfer model of distillation tray is deduced by considering the effects of velocity fluctuation , concentration fluctuation and volume fraction of gas and liquid on mass transfer . a source item sc for interphase mass transfer is considered . by applying conventional method of estimating the interphase mass transfer coefficient , a formula for sc is obtained
其次，采用体平均概念、雷诺时均化方法结合塔板气液相互作用的实际情况首次推导了考虑速度、浓度脉动项和气、液相含率影响的塔板三维拟单相流湍流传质模型，源相中考虑了气液相间传质项sc ，并运用化工中关于相间传质系数计算的理论，推导了sc的表达式。