输出下限

In this paper, we focused on the Thermal Power Generator unit commitment optimization. A mathematical model is presented and consuming minimization of generator is chosen for its objective function, with the power balance, generation capacity limits, maximum allowable start and stop times limits and time limits taken into consideration. The unit commitment optimization is constrained minimization problem.

本文主要对火电机组优化组合问题进行了研究，提出了机组优化组合的数学模型，该模型以发电总成本最小为目标函数，同时考虑了功率平衡约束、机组输出功率上、下限约束，机组最大允许启停次数和时间约束等约束条件。

A digital AGC circuit using a digital potentiometer to rep lace the feedback resistance of the amp lifierwas designed. In order to get an app rop riate gain, MCU adjusted the resistance of the digital potentiometer automatically according to the voltage value of amp lifierps output.

为使输入信号不受这一限制，设计了一种数字式自动增益放大电路，该电路采用数字电位器取代放大器的反馈电阻，单片机根据放大器输出电压自动调整数字电位器的阻值来调节放大器增益，使输出电压始终维持在所设定的上下限电压之间。

A DC-to-DC converter includes a pulse width modulation circuit cooperating with at least one power switch for supplying power from a source to a load over a range between a lower limit and an upper limit to thereby control an output voltage for the load.

一种直流-直流转换器，包括一个与至少一个的电源开关协作，以在一个上限和下限的范围内由电源向负载供电，从而为负载控制输出电压的脉宽调制电路。

AMF electromagnetic flowmeter function characteristic: The entire Chinese menu, the large screen four line of high definition LCD back light demonstrated: 1st, does not need to hit the starting blank pipe warning function; 2 provide the sensing sensor section misalignment revision function; 3 frequency quantities output 4----the 20MA output, flows to the output, the cumulant pulse output; 4 cumulant valve value outputs the RS485 output; 5 use the international advanced fabrication technology, the stable property, remarkable; 6 input the port to be equipped with the safe anti-radar protection; 7 automatic controls, the measuring range bound may establish voluntarily; 8 regurgitation to measurement; 9 small signal excisions; 10 use highly effective, the high stability PWM wave excitation constant current; 11 damping times elect; after 12 power failures, data long-term preservation; 13 scaling factors not fluid characteristic, active status, influences and so on conductivity.

AMF电磁流量计功能特点：中全中文菜单，大屏幕四行高清晰度LCD背光显示：1，无需打开机空管报警功能；2 提供传感传感器段非线性修正功能；3 频率量输出4----20MA输出，流向输出，累积量脉冲输出；4 累积量阀值输出RS485输出；5 采用国际先进的制造工艺，性能稳定，卓越；6 输入端口均设有安全防雷保护；7 自动调节，量程上下限可自行设定；8下反流向计量；9 小信号切除；10 采用高效，高稳定度PWM波励磁恒流源；11 阻尼时间选；12 断电后数据长期保存；13 仪表系数不受流体特性，工作状态，电导率等影响。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失