A necessary and sufficient condition for nonlinear systems to achieve optimal regulator is given by using the return difference condition and completion of the squares argument.
利用返回差条件，借助配方方法讨论非线性系统达到最优调节所必须满足的充要条件。
Results showed that the optimum conditions of the measurement were as follows:the water reservoir temperature should be 90%-96% of the upper limits, return difference value should be 0.
实验结果表明：恒温水浴槽灵敏度测定的最优条件是水浴温度为测定上限值的90%～96%、回差值为0。
The sensitiveness of thermostatic waterbath was measured by orthogonal design under ditter - ent water reservoir temperatures, mixing speeds, hyperthermic speeds and return difference values.
采用正交设计实验，在不同的水浴温度、搅拌速度、升温速度及回差值的条件下测量了恒温水浴槽的灵敏度。
Abstract: in order to accurately measure the pulse equivalent and return difference of stepping motor, a laser micro-displacement measurement system is proposed based on thin film interference.
摘要：为了精确测量步进电机的脉冲当量和回程差，提出了一种基于薄膜干涉原理的激光微位移测量系统。
Abstract: in order to accurately measure the pulse equivalent and return difference of stepping motor, a laser micro-displacement measurement system is proposed based on thin film interference.
摘要：为了精确测量步进电机的脉冲当量和回程差，提出了一种基于薄膜干涉原理的激光微位移测量系统。
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