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 ?
The present study aimed to expand the existing literature by examining the relationship between quality and frequency of leisure activity and SWB among unemployed emerging adults.
Recreation or Responses Percent of Percent of leisure activity participant responses sample * Indoor activity 137 80 45 Unaccompanied sedentary 126 73 41 indoor activity (radio, television, reading, cooking) Indoor exercise 11 6 4 (powerlifting, dancing, gymnastics) Outdoor activity 65 38 21 Outdoor sport or game 39 23 13 (football, tug-o-war, jogging) Walking 26 15 9 Unspecified setting (indoors 83 48 27 or outdoors) Socializing with 35 20 12 friends or family Musical hobby (singing or 34 20 11 playing an instrument) Attending religious or 14 8 5 traditional function (ceremonies, night vigils, reciting the Koran) No activity of any kind 19 11 6 Total responses to survey item 304 -- 100 * Participant sample consisted of 172 participants.
Further, paired-samples t tests showed adolescents' leisure activity pattern as: family = Internet > social > outdoor = school.
At the current rate of loss," the endowment study says, "literary reading as a leisure activity will virtually disappear in half a century.
Billiard cues, darts, golf clubs and ice skates are among the items that won't be allowed so if you're planning on bringing some leisure activity items, check first.
Data showed both female and male characters are most likely to be pictured in a leisure activity.
They may be very active, but we may not be picking that up as leisure activity.
American Hobbies and Pastimes" will appeal to everyone who has a favorite sport, hobby or leisure activity.
Other archival materials, such as organizational logs (activity records of fraternal groups, for example), commercial records (receipts of theaters, for instance), and official registers (traffic counts, perhaps) might be used to develop time series on leisure activity.
7,066,383 entitled "System for Marketing Leisure Activity Services Through Pre-Paid Tickets" that represents the first issued, in a series of patent applications relating to unique "non-monetary" magnetic strip gift ticket.
On average, the five-point Likert scale showed that participants reported a mean rating of 3 or the neutral middle response option to three of the five measures of recreation and leisure activity.