closed system


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closed system

[¦klōzd ′sis·təm]
(engineering)
A system for water handling that does not permit air to enter.
(thermodynamics)
A system which is isolated so that it cannot exchange matter or energy with its surroundings and can therefore attain a state of thermodynamic equilibrium. Also known as isolated system.

closed system

A heating or refrigeration piping system in which the circulating water or brine is completely enclosed and under pressure above atmospheric.

closed system

A system in which the specifications are kept secret to prevent interference from third parties. It inhibits third-party software from being installed; it keeps third-party hardware from interoperating with it, and it prevents third-party enhancements from improving the product. Contrast with open system. See proprietary standards.
References in periodicals archive ?
The Arisure Closed System Transfer device helps address multiple concerns of both healthcare professionals and patients, helping ensure safer drug preparation, transportation, administration and disposal, and helping reduce the risk of accidental exposure or contamination, said Scott Luce, general manager, U.
For example, under a fixed load, the mean response time for an open system model can exceed that for a closed system model by a high magnitude.
Polypropylene shredder tubes create a closed system for sample collection, preparation, storage, and transporting.
With or without our blessing or condemnation, homosexuality is here to stay, a closed system on either side will be left at the pier.
Because of its high cationic charge, the dendrimer additive can significantly improve runnability in closed system applications.
The Orex desktop closed system appealed to the military buyers because, unlike competing CR systems, the Orex re-usable plate is never exposed to the clinics' working environment.
The goal of this study was to develop a closed system vitrification protocol that eliminates the exposure of embryos to the potential contaminants of liquid nitrogen.
Chewing, digesting, and excreting its own revolving essence, it represents a closed system in which each element seems to refer to other parts internal to the cycle.
Also available from Surgidyne is a full line of drains, with or without trocars, and the Penrose II for economical closed system, gravity wound drainage.
It was not just that the print size diminished by several points but also there were sentences such as 'structural linguistics, structural anthropology, hermeneutics, and phenomenology mapped the topological nature of cultural systems but - tautologically - remained a closed system or a synthetic, often capricious analytical system consistent with subjectivity'.
By contrast, relying on vendorspecific solutions yields a closed system, a common problem in the server-based approach and to early SAN-WAN routers.
City officials have yet to decide on policy: whether to require cable companies to open the Internet to competitors or allow cable companies to have a closed system unless outcomes of various lawsuits stop it.