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 ?
('"Whether a non-domiciliary has engaged in sufficient purposeful activity to confer jurisdiction in New York requires an examination of the totality of the circumstances.'" (quoting Farkas v.
Shadow justice minister Edward Garnier hit out at ministerial "incompetence" over the provision of "purposeful activity" in prisons.
This occupational therapy textbook introduces the clinical reasoning skills that are required to use and document purposeful activity in occupational performance.
Among the key findings addressed are the following: (1) Good assessment is grounded in a clear and explicit model of the cognitive processes that underlie complex and purposeful activity; (2) Good assessment is a process of reasoning from evidence that permits valid and reliable inferences about ability to be drawn from a limited opportunity to observe and interpret performance; and (3) Good assessment provides information that learners, teachers, and others can easily understand and use to reflect upon and improve learning and teaching.
This was a purposeful activity to echo the look of walls in the temples.
Snoezelen [R] is an interactive, success-oriented therapy, originally developed for autistic children more than 20 years ago, which uses touch, smell, hearing and sight to engage residents in purposeful activity that accentuates their strengths, not their weaknesses.
The number of calories you burn daily includes energy for basic metabolism, digestion and processing of food, and purposeful activity. Now, researchers have identified a fourth component, Non-Exercise Activity Thermogenesis (NEAT), or "the fidget factor." It's the energy used for unconscious activity, like fidgeting, muscle contraction and posture.
The word business, as a noun, first appeared in the 14th century and meant a) purposeful activity: busyness; b) an immediate task or objective; c) a particular field of endeavor; d) a useful commercial or mercantile activity engaged in as a means of livelihood, and so on.
The second, debate, deals with finding out how sets of purposeful activity and people's differing viewpoints can be systematically reconciled or accomodated.
justice, purposeful activity, personal responsibility and constructive
Specifically, those who cope best are engaged in purposeful activity and maintain regular contact with people outside the nuclear family.
Secure Schools are critical to our vision for youth custody - placing education, healthcare and purposeful activity at the heart of rehabilitation.