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Closed loop may refer to: * A feedback loop, often found in: * * Closed-loop transfer function, where a closed-loop controller may be used * * Electronic feedback loops in electronic circuits * * PID controller, a commonly used closed-loop controller * Closed ecological system not relying on matter exchange outside of the system, as opposed to open loop * Ecological sanitation systems or ecosan, intended to close the nutrient and water cycle * Pulling water from one area of a reef aquarium and pumping it immediately elsewhere in the tank to create higher flow and minimize dead spots * Circular economy, one in which materials are consistently reused rather than discharged as waste * Closed time loop, or predestination paradox, a paradox of time travel that is often used as a convention in science fiction * Closed curve, a mathematical curve described as a set of continuous parametric equations over a closed interval of real numbers for which the start point equals the end point == See also == * Short circuit 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Closed loop」の詳細全文を読む スポンサード リンク
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