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 ?
Atropine is no longer recommended for routine use in managing and treating pulseless electrical activity (PEA) or asystole.
At baseline and 2 months, parents completed Achenbach's Child Behavior Checklist (CBCL), and urine samples from the children were assayed for epinephrine, norepinephrine, dopamine, serotonin, GABA, glutamate, pulseless electrical activity (PEA), and histamine.
The 2005 guidelines state that after most defibrillation attempts, the patient's rhythm will usually change to either asystole or pulseless electrical activity (PEA).