Methods : using the peripheral blood lymphocyte chromosome preparation technique and fragile site technique , to analyze chromosome aberrtion rate and fragile site expression rate of 30 cases of mental retardation sufferer and 30 cases of normal person respectively 方法：采用外周血淋巴细胞染色[摘要]目的：探讨精神发育迟滞者与染色体畸变率和脆性部位表达率的相关性。
About the control group , the chromosome aberration rate of is 1 . 55 % ; the fragile site expression rate is 0 . 89 % . both the chromosome aberration rate and the fragile site expression rate of two groups are distinct from each other ( p 0 . 01 ) 结果：精神发育迟滞者染色体的畸变率为4 . 32 ，脆性部位的表达率为2 . 18 % ，而正常对照组染色体畸变率为1 . 55 ，脆性部位的表达率为0 . 89 ，两者的染色体畸变率和脆性部位表达率有明显的差异( p 0 . 01 ) 。
Several kinds of herbicides treating together show an antagonistic action also exist , even tend to intensify . the results also indicate that the inductive effect was weakened when 2 - ethy - 4 - chloro sodium hydration operated with other herbicides . nc - 302d ( + ) can evidently increase the frequencies of numerical and structural chromosomal aberrations 除草剂精禾草克试验组泥鳅染色体数目畸变率均有明显上升，有的组甚至与对照组差异极显著( p 0 . 01 ) ；各试验组染色体结构畸变率与对照组差异均极显著( p 0 . 01 ) 。
In the distribution system , many capacitor banks are applied to decrease the loss of the network . the harmonic resonance may be incurred between the network and the capacitor banks in the harmonic frequency , thus the security of the system may be destroyed because of the high harmonic distortion level 配电网中装设了大量的电容器进行无功优化来降低网损，但在谐波频率下，容易产生系统与电容器之间的谐波谐振或谐波放大，从而使系统的谐波畸变率变大，破坏了系统的安全运行。
To put into operation a large amount of non - linear load , make in harmony wave of rural power grids serious becoming in pollution , pass to rural local electric wire netting main in harmony analysis of wave source , put forward in order to restrain from insert rural power grids in harmony wave source voltage total in harmony wave distortion rate and the containing rate change last device number pulsating for increase of goal , increase the pulse of the current change device and install light specified value electricity active wave filter mix with passive wave filter near the harmonics source to control the wave in harmony 摘要大量非线性负荷的投运，使农村电网的谐波污染日趋严重，通过对农村地方电网主要谐波源的分析，最终提出了以限制接入农村电网的谐波源的电压总谐波畸变率和各次谐波电压含有率为目标的增加换流装置脉动数，以及在谐波源附近装设小额定值的电力有源滤波器配以无源滤波器的混合型电力滤波方式，以进行谐波治理。
In accord with the state standard about harmonic . the harmonic permission value of tangqian line is calculated . some measurement data are shown and analyzed , and some main conclusion is drawed that the 7th harmonic voltages of tangqian line is near to the permission value , total harmonic voltage distortion ratio has oversteped the permission value . the 3th harmonic , the 5th harmonic , the 7th harmonic and the 9th harmonic current from tangqian line all overstep the permission , the largest 5th harmonic current ratio in tangsc reaches 44 % , the 7th harmonic and the 9th harmonic current in tang7c and tangsc is large maybe because the harmonic current is magnified . this paper studies the model of each element in tang yin substation 根据有关公用电网谐波的国家标准，计算出汤牵线注入汤阴变电站的谐波电流允许值，从实测数据可以得出一些重要结论：汤牵线7次谐波电压含有率的最大值接近国标中的限值，汤牵线的谐波电压总畸变率的最大值已超标；汤牵线注入电网的3 、 5 、 7 、 9次谐波电流都超标；汤6c电容器的5次谐波电流含有率较高，最高达到44 ；汤7c和汤8c电容摘要器的7次和9次谐波电流含有率偏高，原因可能是发生了谐波电流放大现象。
Computation method based on fast fourier transformation ( fft ) is studied deeply , whose measurement accuracy is 0 . 2s . the computing indexes involve voltage , current , power , frequency , phase , electric power , the harmonic ratio and the total harmonic distortion ( thd ) of phase voltage and phase current 深入研究了测量精度为0 . 2s级的基于快速傅立叶变换( fft )的电压、电流、功率、频率、相位、电能等电力参数和各相电压电流各次谐波含量、谐波含有率、谐波总畸变率的计算方法。
Considering the influence of damping winding and if core is saturated or not , the no - loading emf waveform of a conventional generator having the same size with the prototype ( except the stator slot ) is analyzed , and the waveform deviation factor is taken out 对一台具有与电力发生器样机相同尺寸（除定子槽形）传统发电机的空载电势波形进行了分析。分析了不考虑铁心饱和、考虑阻尼绕组影响和考虑铁心饱和、考虑阻尼绕组影响两种情况下，它的空载感应电势，求取了空载电势波形畸变率。
According to the no - loading waveform deviation factor , the prototype conforms to the national design standard and practical needs in the engineering . more important , the high voltage is achieved . in the condition of considering core saturation and damping winding influence , the influence to powerformer of the no - loading tooth harmonic emf is smaller than conventional generator , and the waveform deviation factor of the former is smaller , too 由求得的样机空载电势波形畸变率可知，该样机满足国家设计标准和工程实用要求，更重要的是，实现了产生高压的目的；考虑铁心饱和、考虑阻尼绕组影响情况时，电力发生器与具有相同尺寸(除定子槽形)的传统发电机相比，空载齿谐波电势对电力发生器的影响较小，前者的空载波形畸变率较小。
Some key parameters to affect hepmg performance are studied and some design rules are given . the principle of load distribution and estimate calculation of permanent magnet and electrical exciting are given . methods of improving the power density and weakening aberration rate of sine wave are research 对影响hepmg性能的关键参数进行了计算研究，总结了参数设计规律；提出了hepmg中永磁体和电励磁的负荷分配原则并给出了估算方法；分析了提高hepmg功率密度和降低电动势波形正弦畸变率的措施。
