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 classic literature ?
I readily concede that in this, as in every period of intellectual activity, there has been a noise of denial and protest; much was to be resisted, much was to be got rid of by those who were reared in the old, before they could begin to affirm and to construct.
We wish to escape from subjection and a sense of inferiority, and we make self-denying ordinances, we drink water, we eat grass, we refuse the laws, we go to jail: it is all in vain; only by obedience to his genius, only by the freest activity in the way constitutional to him, does an angel seem to arise before a man and lead him by the hand out of all the wards of the prison.
Pascal, from considerations to which Amiel was no stranger, came to the large hopes of the Catholic Church; Amiel stopped short at a faith almost hopeless; and by stopping short just there he really failed, as we think, of intellectual consistency, and missed that appeasing influence which his nature demanded as the condition of its full activity, as a force, an intellectual force, in the world--in the special business of his life.
This they enclosed with palisades; and in respect of energy and activity, it might have been mistaken for one of the great cities of the Union.
strange disease,' in which men hurry wildly about in a mad activity which they mistake for achievement.
For them he borrows from German criticism the name 'Philistines,' enemies of the chosen people, and he finds their prevailing traits to be intellectual and spiritual narrowness and a fatal and superficial satisfaction with mere activity and material prosperity.
Nietzsche says that to speak of the activity of life as a "struggle for existence," is to state the case inadequately.
Factory activity also rose briskly, and the energy sector strengthened.
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.
A new section is provided that is based on section 4(k) of the BHC Act, which discusses the Board's October 2, 2003, approval of an FHC's notice under section 4 of the BHC Act to engage in physical commodity trading activities on a limited basis as an activity that is complementary to the financial activity of engaging regularly as principal in commodity derivative activities.
Children are going to one activity after another in which they are competing," Sluss says.
In general, the IRS will treat a taxpayer as materially participating in an activity only if that taxpayer is involved in the operations on a regular, continuous and substantial basis.

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