有效功率

Simulation results show that by means of utilizing super conductors the power output capability of DC system can be effectively improved, the service life of DC system can be elongated, thus both reliability and economy of DC system can be improved.

仿真结果表明，该方案通过采用超级电容器，能够有效提高直流系统的功率输出能力，延长直流系统的使用寿命和改善其技术经济性，从而提升直流系统的可靠性和经济性。

Overcharge of single battery is suppressed via limiting its charge cut-off voltage, and overdischarge of battery pack is prohibited by means of controlling the voltage of single battery and the application of power switch.

提出铅酸蓄电池组的电源管理设想，通过有效的限制单体充电终了电压防止单体蓄电池的过充电，通过单体电压检测和功率开关防止铅酸蓄电池组的过放电。

The results indicated that laser effective penetrating depth and laser power density and radiating time is positive relationship, but the relationship with energy density is not good.

模拟结果表明激光有效穿透深度与激光功率密度和时间都是正向相关，而与能量密度的正向相关性较差；激光作用时间越长，角膜组织中的温度梯度越小。

In constant torque region, the phase-independent direct torque control can be obtained by controlling the motor current of each phase without resort to vector transformation.

在恒功率运行时，本文采用相电流相位超前反电势的方法，利用绕组电抗电势削弱反电势来解决电流控制失效的问题，有效扩展了高速运行范围。

The instrument simultaneously sample for three phase voltage and current. Rotary photoelectric coding switch and LCD are used for human-computer interaction. it makes the interface compact and efficient. Utilizing the function of positive and negative edge trigger of the programmable counter array unit in MPU, signal zero-cross is captured for the phase detected based on double way. The software synchronism sampling method based on real-time parameter self-optimizing minishes period truncation error, and the measurement accuracy is improved. The digitization power measure imports traditional two-unit and three-unit methods and expands application range of the instrument. The capacity is discriminated by soft ware table-look-up on the load loss. The value of a quantity is converted to the value when reference temperature (75 ℃) from test temperature.

该仪器具有以下特点：仪器对三相电压电流同时采样；基于旋转式光电编码器和液晶显示屏的人机交互界面简洁而高效；可编程计数器阵列PCA"捕获"信号的过零点用于双向过零平均鉴相，得到准确的相位差和周期；基于实时参数自寻优的软件同步采样，有效地减小了周期截断误差，提高了测量准确度；数字化功率测量引入了传统的二表法和三表法，扩展了仪器的使用范围；实际容量根据负载损耗用软件查表的方法来判别；测量值已从试验温度折算到了参考温度(75℃)时的值。

An efficient analysis method for the switching-mode tuned power amplifier is presented in this paper.

本文给出一种分析开关调谐功率放大器的有效方法。

Experiments show that this system can control power amplifier group effectively.

实验证明，该系统能够有效地对功率放大器组进行控制。

The new method for identifying trabecular patterns based on power spectrum and fractal analysis is proposed in this thesis.

本文针对这些问题通过对骨X线图象的功率谱分析和分形分析，提出了更为有效的识别方法。

And then it analyses the statistic attribute and power spectrum of the difference signal.

对差分信号所进行的功率谱分析表明潮汐成分得到了有效去除。

Therefore,a series studies of ice-pier vibration are performed from different aspects in this paper.The main work of this his thesis is summarized as follows:(1) Ice response spectra is proposed based on the idea of a seismic response spectra analysis of str .. uctures.Firstly,ice response spectra on the basis of power spectra density function is established;Secondly,based on the assumption of quadratic parabolic interpolation method,the nonlinear interpolation analysis method of ice response spectra is studied from both theoretical and practical points of view,and the successive computation formulas including ice displacement,velocity and acceleration response spectrum are deduced by Duhamel integral.Furthermore,to analyze the effectivity and applicability of the method, the real temporal curves of ice pressure are used to be studied.The results show that the presented method is more convenient and accurate to study the structural response induced by ice force,also it can be effectively applied in the design of ice resistance.

鉴于此，本文针对冰激桥墩结构振动问题从不同方面展开了一系列与之相关的研究，主要研究内容如下：(1)根据结构抗震反应分析思想提出了冰振反应谱，首先建立了基于功率谱密度函数的冰振反应谱；其次借鉴地震反应谱内插法的思想从理论和实际观点出发，假定在等距离微小时间间隔内冰荷载按二次抛物线规律变化，由Duhamel积分推导出冰振位移、速度以及加速度反应谱的一系列连锁公式，建立了基于非线性内插法的冰振反应谱，并利用实际冰压力时程曲线进行了冰振反应谱数值分析，为以后冰激结构振动的研究提供一种方便、简捷、精确的分析方法，也能够将其有效地应用到结构的抗冰计算中。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了