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 ?
Keep Teaching Materials Hidden Until They Are Needed It is almost always a mistake to display materials for a lesson or activity before they are used.
When using IDEFO for DoDAF activity modeling, an interesting problem arises when dealing with information transfer activities.
New York: Delivering typeset negatives to in-state customers is a protected activity under P.
The books, "Talking Walls" (Knight, 1995) and "Talking Walls: The Stories Continue" (Knight & Chan, 1996) served as the main resource of the activity.
The routine activity theory sought to fulfill shortcomings in existing models that failed to adequately address crime rate trends since the end of World War II.
More recently, physical activity has been found useful in the rehabilitation of some cancer patients by improving physiology such as lymph flow in the extremities.
While watching this display for 39 minutes, participants tried various mental strategies both to increase and to decrease their brain activity during brief periods of heat-pulse application.
It is important to match appropriate music to a movement activity.
In addition to the availability of food and opportunities for physical activity that can affect behavior, so too can the way in which physical activity and foods are marketed to the population.
CPAs need to be on the lookout for MSB activity when dealing with existing or new clients.
Let's take a closer look at the activity, broken down by district:
Because this exception refers to the nature of the taxpayer (possibly referring to taxpayers eligible for the de minimis exception available for producers with indirect costs of $200,000 or less (10)) rather than the nature of the production activity or item produced, some have questioned whether producers of software or of property subject to the long-term contract rules of section 460 (activities not otherwise subject to section 263A (11)), must voluntarily subject those production activities to the uniform capitalization rules in order to include the gross receipts from those activities within DPGR.

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