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The total hardness of water is the sum of calcium and magnesium hardness expressed as mg/l CaCO3.
It was found that the sum of calcium and magnesium concentration and temperature had the most effect on the predicted EC.
The SAR measures sodicity in terms of the relative concentration of sodium ions to the sum of calcium and magnesium ions in a water sample.
From 11 input candidates, the most important and selected input variables were pH, temperature, water discharge, sodium, and sum of calcium and magnesium.
In this study, the ANN modeling technique was used to predict future conditions in this river using pH, temperature, water discharge, sodium, sum of calcium and magnesium concentrations.
In addition to the SAR and Na%, the excess sum of carbonate and bicarbonate in groundwater over the sum of calcium and magnesium also influences the unsuitability of groundwater for irrigation.
Similar(44)
We assume that the total amount of intracellular calcium – the sum of cytosolic calcium and calcium in the ER – is constant.
To test our model for cooperative calcium binding, we solved Eq. 9, 18, 21, and 22 for the sum of the calcium bound states B2, B3, T2, and T3 (Table 1), given an arbitrary free calcium.
These results were used to calculate the calcium to phosphorus (Ca/P) ratio, the calcium to carbon (Ca/C) ratio and the sum of Ca and P (Ca + P) for the determination of bone decomposition/aging.
In MESA, CAC is measured with the Agatston score, which is the amount of calcium at each lesion scaled by an attenuation factor and summed over all lesions [3].
In a separate analysis that used coronary calcium score as a continuous variable, the base 2 logarithm of the sum of the coronary calcium score plus 1 (log2 [CAC + 1]) was used.
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