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.
Mastery "focuses on the efforts put into honing one's skills or achieving a new level of success in a leisure activity .
The significance of a classification of leisure activities lies in the need to communicate among researchers and also to convey messages to the individuals in the community trying to promote leisure activity participation as an intervention for diverse purposes.
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).
This study explored the effects of parental monitoring, leisure boredom, and leisure activity on adolescents' Internet addiction.
The other areas were Sunderland - where gang fights were also seen as a leisure activity - Bradford, Bristol, Tower Hamlets in London and Peterborough.
This is also corroborated by using this form of leisure activity as respite for academic stress and boredom.
Amy Evans gets her Leisure Activity Passport from Coun Val Richards.
The validity and reliability of the Family Leisure Activity Profile (FLAP).
Under Communist rule the Polish government encouraged amateur filmmaking as a leisure activity for workers, though these nonprofessionals were, naturally, viewed with skepticism by their professional brethren, who labored under the watchful eye of the government censor and were hardly eager to share their few privileges.
The National Endowment for the Arts released a report on July 9 that noted reading for pleasure is not a leisure activity of choice for most Americans: "Reading is in decline among all groups, in every region, at every educational level and within every clinic group," said Dana Gioia, chairman of the endowment.