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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

activity

In CPM terminology, a task or item of work that must be performed in order to complete a project.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
(3) The individual who significantly participates without achieving more than 500 hours in all significantly participating activities is a person involved with a significant participation passive activity.
and communications activities 7.4%, construction activities 6.7%, and transport
Relate New Activities to Previous Student Experience One of the best ways to add interest to a classroom activity is to integrate local content.
This includes funding, identity, deployments, and other activities. Existing regulations tend to focus on job titles, roles, and responsibilities--not on key processes.
During the first interview, 21% of black participants and 4% of whites said that they had had intercourse; 8-44% of blacks and 5-44% of whites had engaged in each of five precoital activities (in increasing order of frequency, oral sex, touching genitals, touching breasts, French kissing and light kissing).
Balance activities might include family vacations, special events, and outdoor leisure activities such as sailing, camping, and fishing.
The next step in the process was to discuss different themes and activities which would be planned for the semester.
Researchers applied the routine activity theory to determine that college women become suitable targets based on their routine and daily activities. The research sought to identify the lifestyle habits of stalking victims to give some predictive value to the likelihood of becoming a stalking victim.
Regular, moderate physical activities are a much more effective strategy for the recovery and maintenance of functional capacity for those who have had an acute or chronic medical condition.
Edourard Seguin, a teacher in the field of music education for exceptional children, advocated moving from gross motor activities to those involving the small muscles and recommended marching for rhythmic and muscular development.
However, we also need to examine how the physical inactivity industries market their products to adults and children through advertisements for televisions, DVDs, video games, movies, and other sedentary activities.
If MSB activities are identified, CPAs must inform their clients of federal requirements for registration, reporting and compliance programs.

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