glossary category

Variable air volume

Telecommunications

An electrically conducting cable, comprising one or more pairs, none of which is shielded. There may be an overall shield, in which case the cable is referred to as unshielded twisted-pair with overall shield (from ISO/IEC 11801: 1995)

A device to stop or regulate the flow of fluid in a pipe or a duct by throttling

A self-contained operating environment that behaves as if it is a separate computer. For example, Java applets run in a Java virtual machine that has no access to the host operating system. This design has two advantages:
* System Independence: An application will run the same in any VM regardless of the hardware and software underlying the system

The unit of measure used in air conditioning to describe the heating or cooling capacity of a system. One ton of heat represents the amount of heat needed to melt one ton (2,000 lb) of ice in one hour. 12,000 Btu/h equals one ton of heat

A crystalline metallurgical phenomenon whereby zinc grows tiny hairs, which can become airborne under certain conditions and settle in electronic equipment

Common alternative to logical, often used to refer to the artificial objects (such as addressable virtual memory larger than physical memory) created by a computer system to help the system control access to shared resources

The vision of utility computing is to access information services in a fashion similar to those provided by telephone, cable TV, or electric utilities. It is a service provisioning model in which a service provider makes computing resources and infrastructure management available to the customer as needed and charges them for specific usage rather than a flat rate. Like other types of ondemand computing, such as grid computing, the utility model seeks to maximize the efficient use of resources and/or minimize associated costs

A system for controlling the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor