有效功率

In addition, The proposed approach is compared with the recognition approach based on he vector power spectrum and radial basis function network. The experiment result shows that the proposed approach is very effective, especially in the small samples.

同时，该方法还与基于矢功率谱的径向基函数网络识别结果进行了比较，实验结果表明，该方法是有效的，尤其在小样本情况下，SVM识别效果明显优于径向基函数网络。

According to analysis of flow field and velocity distribution in the mix tank,the results indicate that:using draft-tube in the mix tank,the axial flowing of liquid can be increased,the circumgyration around the impeller will be improved,and the strong mixed effect can be gained.

通过对有、无导流筒的搅拌槽内流场和速度的对比分析表明：导流筒强化了搅拌槽内上下液体的整体轴向流动，在近浆区域改善了液体的跟转，有强烈的混合效果，并且，在较为理想的流场分布下，有导流筒的搅拌槽功率消耗比无导流筒搅拌槽节省12%，其结果将为搅拌槽的整体结构优化提供有效途径。

This article first introduced designs the high efficiency cocurrent voltage-stabilized source's composition structure and the control principle, and on the power source main circuit, the control circuit, the protection circuit as well as the control system software's design did have analyzed in detail.

但是，上述这些新型功率开关器件也存在一些弱点，如电压与电流的过载能力弱，当工作参数超过其安全范围是，非常容易损坏。因此给电路结构的设计与制造提出了新的要求，并且需要快速而有效的保护措施

The process of feature extraction is to transform the eradiate noise signal to different feature space and extract the feature vectors that reflect the category of the input sample. The extracted features are the input modes to the classifier. Through the inspecting, the author selected three methods of eradiate noise's feature extraction.

本文作者经过考察，采用了三种前期研究中较为有效的水下目标特征提取方法——基于功率谱估计的线谱特征提取方法、基于小波分析的不同频段内能量特征提取方法和基于水声信号分维特性的特征提取方法。

The reason to choose Harr wavelet is that it has excellent time localization performance, concise analytical expression and lower energy leakage on the window scale.

本文讨论了利用Harr小波变换矩阵对电压和电流采样值进行小波变换，测量电力系统功率、有效值和相位的方法。

It provides the link between the theoretical background for limiting the voltage stress on each switching component and the range of voltage variation for an imbricated cell of flying-capacitor multilevel inverter.

并根据单元电压的波动特性，给出了悬浮电容容量的具体选择方法，为保证功率开关承受均衡的阻断电压和有效限制单元电压的波动范围提供了理论依据。

Due to the fact that the intercarrier spacing in OFDM is relatively small, OFDM transceivers are somewhat more sensitive to phase noise compared to single carrier transceivers. Thus this problem must be carefully considered in designing an OFDMbased system since an accurate prediction of the tolerable phase noise can allow designer to relax system specifications. According to spectrum theorem, two components of phase noise were analyzed: common phase error and intercarrier interference. On the basis of the analysis, the performance of OFDM was given for the case where phase noise has been added to the signal, and an optimal design criterion for OFDM parameters was proposed that allows to improve the phase noise error correcting capabilities in OFDM receiver.

由于采用子载波间相互正交的结构，OFDM系统对于由本地振荡器不稳定性所导致的相位噪声影响非常敏感，针对公共相位误差CPE和载波间干扰ICI两种影响表现形式不同的干扰项，从功率谱密度函数这一独特角度分析了相位噪声对OFDM系统性能的影响，提出了旨在提高接收机抵抗相位噪声能力的OFDM系统关键参数优化与设计准则，可在对所设计OFDM系统性能加以提高的同时，有效降低对接收机前端模拟振荡器件和相位噪声抑制单元的性能指标要求，从而降低接收机硬件实现成本。

First, this research developed a set of simple and effective technologies for preparative extraction and separation of flavonoid and phloridzin from Lithocarpus polystachyus, which includes:(1) Microwave-assisted extraction of flavonoid f...

本研究首先研发出一套简单、有效的制备性提取分离多穗柯黄酮类及其根皮苷工艺，这套工艺包括：(1)微波辅助氢氧化钙水溶液提取多穗柯黄酮，最佳工艺条件为用1.2 %氢氧化钙水溶液为提取液，料液比1：12，预煮时间5min，微波功率800W处理25min。

First, this research developed a set of simple and effective technologies for preparative extraction and separation of flavonoid and phloridzin from Lithocarpus polystachyus, which includes:(1) Microwave-assisted extraction of flavonoid from tender leaves of Lithocarpus polystachyus Rehd. The extraction conditions are as the follows, 1.2 % of Ca2 water solution, solid-liquid ratio of 1:12, pre-boiling for 5 min, 800 W of microwave treating for 25 min.

本研究首先研发出一套简单、有效的制备性提取分离多穗柯黄酮类及其根皮苷工艺，这套工艺包括：(1)微波辅助氢氧化钙水溶液提取多穗柯黄酮，最佳工艺条件为用1.2 %氢氧化钙水溶液为提取液，料液比1：12，预煮时间5min，微波功率800W处理25min。

G. RMS value of the voltage, current, active power and frequency spectrum etc, can be measured with much improved accuracy under nonsinusoidal situation.

应用μC构成智能化的测量装置，当用于测量畸变波形下的电压、电流有效值、有功功率等量和进行谐波分析时，能够获得很高的测量准确度。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。