To find out total α and total β radiation level in tap water and study the relationship between α and β radiation activity and rainfall Total α and β radiation specific activity (RSA) were measured by the method of evaporation(GB 8538 56 87) Curve fitting of data was analyzed by SPSS package Total α RSA varied from 15 0 to 95 7 Bq m -3 (44 68±19 34 Bq m -3 );
Based on the solution theory,the thermodynamical approaches to calculation of the component activity coefficients in organic phases,to determination of the thermodynamical equilibrium constant of metal extraction reaction and to predic- tion of the metal extraction equilibrium distribution are presented.
Based on Guggenheim's quasi-chemical equation and one-fluid model, a formula for the calculation of local composition and the molecular model for the component activity coefficient in liquid mixtures are derived.
However, activity curve of Ba-Ca alloy melt shows a small negative deviation from the idea solution which indicates the intersolubility of Ba-Ca alloy melt is perfect.
In this work,the formation enthalpy of Mg-Zn alloy has been calculated,according to the Miedema model. Further,the activity curve of Zn in Mg-Zn alloy at 1 000 K is calculated.
The enzyme was stable in the pH range of 3.0-5.0 and displayed an optimal temperature of 55°C; it showed a typical endo-splitting way of substrate hydrolysis and exhibited a fair degree of activity on pectin with a high degree of esterification.
Given the degree of activity in patients with stage IV disease, it is imperative to begin neoadjuvant and adjuvant trials with the newer drugs and drug combinations.
A presentation is offered with respect to the considerations governing the mechanisms of thermal-radiation activity on a film of an epoxy enamel applied to a compound ceramic backing.
High accuracy can be obtained with the relative method of determiningγ-radiation activity on a scintillation counter only when the samples are precisely positioned, especially for small distances between the source and the radiation detector.
The obtained experimental data are described mathematically in terms of the Wilson equation, and parameters characterizing the concentration dependence of the component activity coefficients are calculated.
Although isoproterenol caused an increase in Δ12-terminal component activity with decreased Δ12-terminal component activity, dexamethasone reduced these isoproterenol-mediated activity changes.