分谐波

The study has focused on: 1 The research background and the current state of the power measurement were analyzed systematically, and then wavelet-based power measurement algorithm was certified feasible for astable signals; 2 We developed a new method of RMS and power measurement based on Dmeyer wavelet. After that three other wavelet measurement approaches were compared with Dmeyer wavelet-based measurement approach. Then the impact on measurement errors of amplitude frequency property and energy leakage of wavelet filter banks were deeply researched, and some measures were proposed to reduce it; 3 We developed a new strategy of power measurement algorithm based on lifting wavelet, which had calculation advantage compared with the first wavelet, so that it was more suitable for the realization of hardware; 4 The running system of wavelet-based power measurement algorithm based on DSP was proposed, and then it was realized on ICETEK-VC5416-A EVM board; 5 Existing problems and the further research direction of wavelet-based power sub-band measurement algorithm was discussed.

本文对基于小波变换的功率测量算法展开深入的分析研究，主要内容有：1）系统地分析了功率分解测量的研究背景、国内外的研究现状，并从能量守恒的角度验证了小波功率分频带测量算法在非平稳信号条件下的可行性；2）首次提出了Dmeyer小波变换有效值与功率的测量方法，进而通过对该方法与3种已经提出的小波测量方法的对比分析，深入研究了小波滤波器组的幅频特性和能量泄漏特性对测量误差的影响，并针对电网谐波的特点提出了减小影响的相关措施；3）首次提出了二代小波功率测量算法，对比一代小波功率分频带测量算法，它大大减少了算法实现的运算量及内存的需求量，从而更适合于硬件的实时实现；4）提出了小波功率分频带测量算法的DSP实现方案，并在ICETEK-VC5416-A EVM板上进行了实现；5）探讨了小波功率分频带测量算法目前仍存在的问题，并提出了进一步的研究方向。

In this paper, a research of a Ku-band subharmonic sampling phase-locked oscillator is presented.

本文研究了Ku波段低相位噪声分谐波采样式锁相振荡源。

A process which is coupled to the narrow band of brain temperature could allow all normal human brains to be. affected by a subharmonic whose frequency range at about 10 Hz would only vary by 0. 1 Hz.

一个过程，它被链接到狭窄的大脑温度的波段，它能允许所有正常的大脑受到一个分谐波的影响，它的频率范围在大约10HZ，其仅仅由0.1Hz来改变。

Them, it introduces Three Phase Ferromagnetic resonance circuit thoroughly and makes a further analysis of its generation of high harmonic, harmonic ferroresonance and the mathematical model of subharmonic.

然后详细地介绍了三相铁磁谐振电路，对其所产生的谐波谐振、基波谐振、分频谐波谐振建模，做了进一步的分析。

At last, the proposed algorithm is simulated under such conditions as sinusoidal voltage, nonsinusoidal voltage, frequency fluctuation, sampling frequency and sampling time length in change.

最后分别在电压无畸变、电压含谐波、电压频率波动、采样频率以及采样时间长度变化时，对文中提出的介损测量正交分解法进行仿真验证，并与谐波分析法进行比较分析。

First we give the analysis of the receiver front-end block diagram, link budget and specification allocation. Then, all the sub-circuits , including low noise amplifier, waveguide-to-microstrip transition , image reject band--pass filter, low-pass filter, and sub-harmonic mixer , are described in details.

在接收机组成方案分析，链路计算及指标分配的基础上，结合理论计算和计算机仿真，给出了各单元电路(包括探针式波导-微带转换器，低噪声放大器，镜频抑制带通滤波器，分谐波混频器，低通滤波器等)的设计和仿真结果。

Subharmonics appear in some forms of nonlinear distortion

分谐波以某种非线性失真形式出现。

This paper studies the phenomena of intermittent subharmonics and chaos in DC DC converters according to the consideration of coupling filter,consequently concludes that the origin of intermittency comes from conducted or radiated EMI.

文章从电路耦合滤波的角度考虑，分析了一类间歇分谐波与间歇混沌现象产生的原理，确定耦合电路传导和辐射干扰是产生该现象的根源，并构造了一个开关变换器模型作为研究对象，仿真与实验均得到了相似的非线性现象，同时对不同的电路参数集，讨论并分析了其对间歇现象产生所起的不同影响，为变换器的稳定设计提供信息。

Due to conducted or radiated EMI from inner or outer coupling circuits,breathing can exist in current-mode controlled Boost converter.It exhibits as a time-bifurcation undergoing regular period-1,subharmonics and chaos orderly and repeatedly for a long period.

本文揭示了在电流模式控制Boost变换器中，由于存在内部或外部耦合电路引起的传导和辐射干扰，使得有可能产生呼吸现象，这是一种以较长的周期按顺序交替历经规则、分谐波和混沌状态的时间分叉现象，在功率变换电路中是一种非正常的工作状态。

The intermittent chaos and subharmonics in high-order switching power converters are studied with a current-mode controlled SEPIC (single ended primary inductor converter) converter serving as an example.

以四阶电流模式控制单端初级电感变换器(single ended primary inductor converter，SEPIC)为例，研究高阶开关功率变换器中的间歇混沌和间歇分谐波现象。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。