In the paper it makes focal points of the zig - zag transformer " influences on the harmonics of line side and pulse shifting control influence on the harmonic of motor side . the theoretical computation and computer simulation waveforms are presented 重点分析了变压器曲折接法和移相多重化整流对网侧谐波的影响及移相pwm控制方式对减少输出侧谐波的作用，并给出理论计算结果和计算机仿真波形。
As a result of employing multilevel phase - shifted method with zig zag connection in transformer secondary , in the primary the current harmonics their orders are lower than 6m 1 are eliminated ( m is the number of power cell each phase ) . in the inverter side because of using pulse shifting pwm control , the equivalent switch frequency of output is m times as high as one h - bridge , so the output voltage waveform of the inverter is near sine with less harmonics 对于整流电路，由于采用变压器移相多重化整流，在理论上可以实现曲折变压器一次绕组中低于6m 1次谐波电流相互抵消( m为串联单元个数) ；对于逆变电路，由于采用移相pwm控制方式，等效开关频率提高m倍，因此输出电压接近正弦波，谐波含量较小。
According to the feature of base model of tire molds and our cnc machines , choose zig - zag surface to manufacture tire top and use variable contour manufacture tread grooves , create postprocessor files for different machines , customize operation templates and generate out 5 axes coordinates nc programs , and make verifications before engraving . master models were manufactured on the 5 axes cnc machines 根据轮胎模具基模及我公司数控机床的特点，分别选用了往复式曲面铣和可变轴曲面轮廓铣两种加工方法分别加工胎面及花纹，配置了机床的后置处理程序，并定制了具有本企业特点的加工模板，生成了五坐标联动数控程序，进行了仿真检验。
( 4 ) it is the largest area of the danxia landfonn of the northwest of the yunnan province in china . there are three landscape areas include liming scenery spot , luoguqing scenery spot and shibaoshan scenery spot . it takes three scenery spots as a action research for analysis of the zig - zag pattern caused by joints , weathering , tectonic activity and magma activity 第四，针对中国最大的丹霞地貌分布区?滇西北，以黎明黎光、罗古箐、石宝山丹霞地貌景区进行实证研究，初步分析了滇西北丹霞地貌发育的特点?大面积的龟裂现象主要由两组节理和风化作用形成的，构造、岩浆活动也对龟裂的形成起了一定作用。
However , single types are difficult in sewing heavy material and more materials once , it ll cause poor stability feeding and much attrition . in order to ensure zig - zag stitch , linking stitch , locking stitch . wemust adopt double type . needle plate and presser foot of double type should be changed together if you want to use double tye istead of single type . the size of their scres and installs are all - purpose 有时为了保证曲折线缝拼缝锁边等缝纫要求,就要采用双长型送布牙,如果要想把单长型改换成双长型时,必须同时更换双长型的针板和压脚,其螺钉和安装尺寸是通用的
At the same time , taking the tcp and ppp into account which are the bases of the underlayer of gnutella protocol , we use the thought of data flow for reference which is widely applied in the internet . we modify the zig - zag algorithm in order to help f - measure algorithm manage network connection 同时，考虑到gnutella协议其下层的连接大多是基于tcp和ppp协议的，因此，本文还借鉴了当前internet上广泛使用的数据流控制方法? ? zigzag算法，并对其进行了改进，使其能够更好的辅助f - measure算法进行gnutella网络的连接管理。
