Sentence examples for older fraction from inspiring English sources
In other words, the surviving human chromosome Y might have been exposed to a shorter "bombardment" [ 62] by the AluYb8 elements than by the indigenous AluYa5 elements and this is why an older fraction of AluYb8 elements is missing.
The UK, like other developed countries, is experiencing a marked change in the age structure of its population characterised by increasing life expectancy and continuing growth in the older fraction of the population.
The UK, like other developed countries, is experiencing a marked change in the age structure of its population, characterised by increasing life expectancy and continuing growth in the older fraction of the population [ 1- 4].
We find that most spring waters are best characterized by a bimodal mixing model consisting of a new (<1 yr <span class="lh lhl">old) fraction and a fraction that is older, but still modern (recharged after 1950).
If the old fraction is free of CFCs, and no other processes affect their concentrations other than air water equilibrium, the ratio CFC-113/CFC-12 may be proved useful in dating mixtures of young and old water.
A more complete representation of the age distribution of the old fraction would account for the two primary components of old groundwater entering the well.
The oldest fraction of water reaching the well varies with pumping season and was highest during the winter when pumping was at a minimum.
However, the old fraction was treated as a single source of water represented by a broad distribution of ages because a primary focus of that paper was in obtaining estimates of the young fraction in groundwater.
Because arsenic concentrations exceed the USEPA MCL in the oldest fraction, the concentration of arsenic in samples collected from the wellhead can only be completely understood by separating the two fractions of old groundwater entering the well and developing a ternary model of the resulting mixture.
The oldest fraction, f3, should account for about 35% of the flow contributed to the well based on wellbore flow data; however, this fraction was allowed to vary from 0.3 to 0.9 to account for contributions of flow from additional fractions of deep groundwater stored at intermediate depths and (or) to account for wellbore flow measurement uncertainty.
The concentration of the oldest fraction, C3, was assumed to contribute water that was 21,120 years old, which was the age obtained by Bexfield et al. (2012) from modeling the DD sample collected at 176 mbls with a dispersion model using a dispersion parameter of 0.01.
