The current and speed PI regulator parameters are designed using the left half plane zero-pole cancellation method.

采用左半平面零极点相消的方法设计了电流及转速PI调节器的参数；

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With the help of the conformal transformation, we transform a simply connected region and its boundary into the upper half plane and real axis.

借助保形变换将单连通区域及其边界化为上半平面与实轴。

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In this paper, the stresses of gravity dam and dam foundation are calculated by the coupling method of finite element and half plane boundary element.

本文用有限元与半平面边界元耦合法计算了坝体坝基应力，又结合边界配置法求出了坝踵应力强度因子。

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As he later described it, the plane was not much more than half a kilometer above the trees.

VOA: special.2009.11.24

The town of Bor, half an hour by plane down the Nile from Juba, was once a busy trading post but now feels on a different planet.

ECONOMIST: South Sudan

But register with an address in Estonia, just half an hour away by plane, and you get only a list, admittedly rich, of games, gimmicks and lectures.

ECONOMIST: What has Apple got against eastern Europe?

The plane broke in half when it crashed, eyewitnesses said.

BBC: Burma Air Bagan emergency landing kills two at Heho