植物对金属的吸收主要取决于自由态离子活度。
Plant uptake of a metal depends primarily on the free metal ion activity.
本文提出了以氢离子活度为测量值的混合酸滴定的计算公式；
A formula for the calculation of the equivalent volume of acid mixture titration is derived.
实验证明双阻硝酸根离子选择微电极对细胞中硝酸根离子有较低的检出限，是一种选择性高、灵敏、经济的活体测定植物细胞中离子活度的方法。
The microelectrode was turn out to be characterized by a high selectivity and sensitivity of ion and a good economy compared with other intracellular measurement.
参数由拟合蒸汽压、密度和离子平均活度系数数据获得。
Parameters are fitted to vapor pressure, density and mean ionic activity coefficient data.
本文根据熔渣离子理论的正规离子熔液模型要点，基于一般三元系，对正规离子熔液模型渣的组元活度计算公式进行了详细推导。
Formulas giving the activities of components in slags viewed a ternary system which fits the regular ionic solution model deduced from the ionic theory of slags, are derived in detail.
从实测活度和计算模型证明含固熔体、含化合物和含包晶体的熔盐中没有共同离子的任何作用。
It was shown by the measured activities and calculating models that there isn t any effect of common ions in molten salts involving solid solution, compound as well as peritectic.
原因是由氯化钠引起的离子强度的增大导致了药物活度的下降，进而致使稳态流量减小。
The decrement of the steady state flux was attached to the change of thermal activity of on and the existence of ion competition.
最后，用乙酰胆碱离子选择性微电极测定了束缚紧张状态模型大鼠红细胞内的乙酰胆碱活度。
Finally, using the microelectrode sensitive to ACh, the ACh activity in red cells of rat in nervous state was measured.
随着阳离子半径的减少，水的活度降低，水合物相平衡压力增高，温度降低；
The water activity increase with increased cation ionic radius, which results in the decreased inhibiting effectiveness.
随着阴离子半径的增加，水的活度降低，水合物相平衡压力增高，温度降低；
The water activity decrease with increased nation ionic radius, which results in the increased inhibiting effectiveness.
还研究了在氯化钾-氯化锂体系中，氯化锂浓度对锂离子在铝阴极上析出电位的影响，求出了氯化锂的平均活度系数。
The effect of LiCl concentration on deposition potentials of Li ion at al cathode in KCl - LiCl melt was studied and average active coefficient of LiCl was obtained.
还研究了在氯化钾-氯化锂体系中，氯化锂浓度对锂离子在铝阴极上析出电位的影响，求出了氯化锂的平均活度系数。
The effect of LiCl concentration on deposition potentials of Li ion at al cathode in KCl - LiCl melt was studied and average active coefficient of LiCl was obtained.
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