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 ?
It is true that playing video games has logically been considered an impartial leisure activity, although it seems to link as strongly to smoking cannabis as binge drinking.
Consequently, two working hypotheses are proposed according to the set objectives in this article: 1) the renunciation of a leisure activity is related to gender of vulnerable young people; 2) the renunciation of a leisure activity affects the importance that vulnerable young people give to their training capacities.
In this study, the usage of time by older adults over eight occupation domains suggested by OTPF-3 was studied, and correlations between leisure activity time use and life satisfaction were investigated to identify the satisfaction factors related to use of leisure time, and these factors were analyzed.
Super (1980) included leisure activity as one of nine major life roles, of which the sequence and combination inform one's career.
The scientists, led by Debora Rizzuto, from the Karolinska Institute in Stockholm, wrote in the British Medical Journal: "The associations between leisure activity, not smoking, and increased survival still existed in those aged 75 years or more."
In recent years, there has been an abundance of clinical and neurobiological studies examining the modulating effects of leisure activity participation on several outcomes, including mental health and cognitive function.
The process of the adaptation of leisure activity for individuals with RA reflects the selective optimization with compensation theory developed by Baltes and Baltes (1990) in explaining activity participation for older adults and people with disabilities (Falter, Gignac, & Cott, 2003; Gignac, Cott, & Badley, 2002).
The alphas for each of the 10 domains were as follows: Physical Appearance = 0.70; Physical Health = 0.78; Intelligence = 0.66; Academic Performance = 0.73; Occupational Performance = 0.59; Leisure Activity = 0.78; Personality = 0.60; Family = 0.79; Intimate Relationships = 0.79; and Friendships = 0.79.
Since women face a more significant time shortage compared with men, because their work time limits their household and family time, women may find it more difficult to set aside their family tasks for a leisure activity (Hochschild 1989).
Recent leisure literature indicates that the perception of boredom is critical in predicting leisure activity involvement and satisfaction, and consequent life satisfaction (Russell, 1987).
VIOLENT neds see fighting in gangs for their territory as a "leisure activity", a study claimed yesterday.