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 ?
It is Prison Service policy that those who participate in purposeful activity such as work and training should receive payment.
Lack of purposeful activity during the day for all young offenders is a major concern.
According to Wixon, ``pass the hat'' is a purposeful activity, during which street performers ever so graciously beg for tips.
justice, purposeful activity, personal responsibility and constructive
The importance of having meaningful and purposeful activity to undertake whilst in custody cannot be underestimated, particularly work to reduce the risk of harm prisoners will pose when released.
Behind the scenes there is a flurry of purposeful activity.
And Chief Inspector of Prisons Anne Owers told the House of Commons Justice Select Committee in December 2007: "We assess every prison we inspect against our four tests of a good prison - that prisoners are held safely, treated with respect, engage in purposeful activity and are prepared for resettlement - and it is very evident, when we look at those assessments, that small prisons do better.
It recognises the hard work of our staff and the way prisoners are encouraged to build better habits and behaviour through routine, structure and purposeful activity.
It signals the full time return of a once again thriving and vibrant sports club, based just a mile from the city centre, which provides exciting and energetic purposeful activity to scores of local youngsters.
The inspector's report praises the jail for improving in "safety, respect, purposeful activity and resettlement".
Risley also had insufficient purposeful activity to be an effective training prison, although better use could have been made of what there was.
Phil Wheatley, chief executive of the National Offender Management Service, said: ""The prison is working to increase the amount of purposeful activity available for prisoners and a fourth workshop is scheduled to open this summer.