The software comes true the double closed loop regulator, therein the velocity loop is the variable-structure control, and the current loop is the classical PI control.

软件实现了调速系统的双闭环调节，其中速度环采用滑模变结构控制，电流环则是经典的PI控制。试验结果说明该调整系统有较好的动态和静态性能。

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Bobby Calder's research showed that every extra syllable in a product's price decreases its chances of being remembered by 20%, something caused by the fact that a person's phonological loop -- a regulator of memory -- can only hold 1.5 to 2 seconds of spoken information.

CNN: Researching the business world

Chiefs at the Earthlease consortium have told telecoms regulator Oftel details of plans to buy BT's so-called "local loop" assets, sources told news agency Reuters.

BBC: BT bidders in talks with watchdogs