activity
In CPM terminology, a task or item of work that must be performed in order to complete a project.
Glossary
active sound attenuator
A special type of sound attenuator that incorporates a sound source which generates sound waves intended to cancel some of
Glossary
active solar energy system
A building subsystem in which solar energy is collected and is transferred predominantly by mechanical equipment (fans, pumps) powered by
Glossary
active sludge
A sludge, 3 which is rich in destructive bacteria; useful in breaking down fresh sewage.
Glossary
active leaf, active door
In a door having a pair of leaves, that leaf to which the latching or locking mechanism is attached; usually
Glossary
active lateral pressure
The horizontal soil pressure which is exerted by soil on a retaining structure.
Glossary
active earth pressure
The component of pressure in a horizontal direction which a mass of earth exerts on a wall.
Glossary
active door
In a pair of doors, the leaf, 1 that is the first to open and is the leaf to which