activity

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activity

1. the number of disintegrations of a radioactive substance in a given unit of time, usually expressed in curies or disintegrations per second
2. 
a. the capacity of a substance to undergo chemical change
b. the effective concentration of a substance in a chemical system. The absolute activity of a substance B, λB, is defined as exp (μBRT) where μB is the chemical potential

activity

[‚ak′tiv·əd·ē]
(computer science)
The use or modification of information contained in a file.
(nuclear physics)
The intensity of a radioactive source. Also known as radioactivity.
(physical chemistry)
A thermodynamic function that correlates changes in the chemical potential with changes in experimentally measurable quantities, such as concentrations or partial pressures, through relations formally equivalent to those for ideal systems.
(systems engineering)
The representation in a PERT or critical-path-method network of a task that takes up both time and resources and whose performance is necessary for the system to move from one event to the next.

activity

In CPM terminology, a task or item of work that must be performed in order to complete a project.
References in periodicals archive ?
Due to the relative shorter effective refractory periods in the PVs, the cPVB with possible mechanism of triggered activity or reentry mentioned above may be more susceptible to induce rapid PV firing.
The stimulatory effect of [10.sup.-9] M BPS on triggered activity was similar to that of [10.sup.-9] M BPA (Figure 2F).
These surviving Purkinje fibers in infarct region demonstrate enhanced automaticity and triggered activity which may cause polymorphic VT when coupled with prolonged action potential duration (10).