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The absorption rate constant K a is a value used in pharmacokinetics to describe the rate at which a drug enters into the system. It is expressed in units of time −1. [1] The K a is related to the absorption half-life (t 1/2a) per the following equation: K a = ln(2) / t 1/2a.
After its operating cycle, the reactor is shut down for refueling. The fuel discharged at that time (spent fuel) is stored either at the reactor site (commonly in a spent fuel pool) or potentially in a common facility away from reactor sites. If on-site pool storage capacity is exceeded, it may be desirable to store the now cooled aged fuel in ...
And since is fraction of the drug that is removed per unit time measured at any particular instant, then if we divide the rate of elimination by the amount of drug in the body at time t, we get; K = d E t d t ÷ A t = ln 2 t 1 / 2 ≈ 0.693 t 1 / 2 {\displaystyle K={dE_{t} \over dt}\div A_{t}={\frac {\ln 2}{t_{1/2}}}\approx {\frac {0.693}{t ...
It is calculated as the ratio of the number of nonsynonymous substitutions per non-synonymous site (K a), in a given period of time, to the number of synonymous substitutions per synonymous site (K s), in the same period. The latter are assumed to be neutral, so that the ratio indicates the net balance between deleterious and beneficial mutations.
A working timetable (WTT) - (Fr. horaire de service (HDS) or service annuel (SA); N. America Employee timetable) - The data defining all planned train and rolling-stock movements which will take place on the relevant infrastructure during the period for which it is in force; within the EU, it is established once per calendar year. [1]
As technology has advanced, more modern drillers have better control of the overall well. Oil well control is the management of the dangerous effects caused by the unexpected release of formation fluid, such as natural gas and/or crude oil, upon surface equipment of oil or gas drilling rigs and escaping into the atmosphere.
An ICE table or RICE box or RICE chart is a tabular system of keeping track of changing concentrations in an equilibrium reaction. ICE stands for initial, change, equilibrium . It is used in chemistry to keep track of the changes in amount of substance of the reactants and also organize a set of conditions that one wants to solve with. [ 1 ]
In electronics,the cut-off voltage is the voltage at which a battery is considered fully discharged, beyond which further discharge could cause harm. Some electronic devices, such as cell phones, will automatically shut down when the cut-off voltage has been reached.