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 ?
Take a walk in the park, go for a swim or find some other displacement activity if you just want to get out of the office.
Emyr Evans, osprey project officer for RSPB Cymru, said: "The female had been agitated throughout the afternoon, moving around the nest and engaging in displacement activity.
The LAMP method requires a set of four specially designed primers and a DNA polymerase with strand displacement activity.
Therefore, we look at whether the probability of involuntary job loss is higher in industries with higher levels of technology and whether older and less skilled workers are more likely to experience the brunt of this displacement activity.
Since television is so available to young children, while reading requires such effort, watching television may be a displacement activity which cuts down on time spent practicing reading.