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In this paper, the change of back electromotive force current with the different PWM modes are analyzed in detail on the base of BLDCM model. According to theory and experiment ,ON-PWM type restrains the peak value of back electromotive force current and brings the lest effect to the motor control system.

基于无刷直流电动机的数学模型，分析比较了不同PWM调制方式下反电势电流的变化规律，并通过理论推导和仿真实验证明了当电机系统采用ON-PWM调制方式时，能有效地抑制反电势电流的峰值且对电机控制系统造成的影响最小。

It basically operates the main point as follows: The left hand holds the ticket, the palm is downward, the thumb is pinned in the middle of the left end of the front of the bank note, the forefinger and middle finger are on the back of the bank note, pinch the bank note together with thumb; Left hand the third finger naturally curly, pinch, get up bank note little finger stretch to bank note front push down bank note below the Left deviation; The middle finger of left hand is exerted oneself slightly, the bank note of tight card together with the third finger, little finger; The left hand forefinger is stretched, the thumb is moved upwards, pin the side of the bank note, keep the bank note into the tile shape; Left hand wipe from tabletop bank note, bank note turn, thumb strength wiped from tabletop to borrow prop up bank note covering of a fan and oblique to oneself of WeiKai Cheng; Three fingers of right hand dip in water, rotate and move the lower right corner of the bank note downwards sharp with the thumb, the forefinger cooperates with the thumb to rotate and move on the back of the bank note; Play in one's arms, count while ordering with right hand the third finger bank note got up to rotate; Pay attention to the posture at the some paper money, the health is straight and upright, the eyes It must keep eyeball and bank note from,put dual tactics elbow at tabletop.

其基本操作要领如下：左手持票，手心向下，拇指按住钞票正面的左端中央，食指和中指在钞票背面，与拇指一起捏住钞票；左手无名指自然卷曲，捏起钞票后小拇指伸向钞票正面压住钞票左下方；左手中指稍用力，与无名指、小拇指一起紧卡钞票；左手食指伸直，拇指向上移动，按住钞票的侧面，将钞票压成瓦形；左手将钞票从桌面上擦过，钞票翻转，拇指借从桌面上擦过的力量将钞票撑成微开的扇面并斜对自己面前；右手三个指头沾水，用拇指尖向下捻动钞票右下角，食指在钞票背面配合拇指捻动；用右手无名指将捻起的钞票往怀里弹，边点边记数；点钞时注意姿式，身体挺直，眼睛和钞票保持一定距离，两手肘部放在桌面上。

Http://www.zshare.net/audio/671213750036217a/ Yungztuh 403 tha realest on da scene triple beam only seventeen yungin dont give phuc lazz it down foh ma homies on da streets nay mean fake ass snake be ducking around running around like their in a phuc'in track meet so im comming back wid da fourty five leave these hataz 6 feet deep and still alive ima keep it live yo foh son young asian cat wid da gun, dis 187 shiet has just begun want beef 2 sicc wid dis leave ya deseased rest in piss on avenue corner of your block straight banging dis set till midnight clock batttle field got da caps peeled back on side be chillin makin these tracks makin these paper stacks rising these tax on these foos young and dangerous u see cant phuc wid a asian g burry your carcus in a cemetary bettah know yo place laz it down 403 soaked up on hennessy, give ya hataz a taste give me face or ya whole life will be a waste...

http：//www.zshare.net/audio/671213750036217a/ Yungztuh 403三重塔realest梁大舞台上只有17 yungin不要给伏lazz下来文物之友达街道马兄弟，在NaY平均假像蛇屁股回避他们的周围到处乱跑在phuc'in田径运动会等即时通讯回来妇女参与发展达45给这些hataz 6 英尺深，仍然活着的IMA保持住哟亚洲青少年文物之友子猫妇女参与发展的大枪，解散187 shiet刚开始要牛肉二上咨妇女参与发展的存款保险计划给你块遐deseased休息角落小便大道直上敲打时钟设置，直到午夜解散batttle外地回来了侧面大帽去皮这些轨道是待在马金马金纸堆上升这些ü税这些福斯古惑仔妇女参与发展的一个倾斜伏见亚洲克伯里公墓bettah您卡库斯在知道哟地方拉撤路下来浸泡轩尼诗了403起，给予亚hataz味道给我的脸庞，还是遐一生将是一个废物。。。

Get off someone's back 不打扰;让人清静 Christy told Todd to get off her back so she could finish her paper.

克里斯蒂告诉特德别打扰她，让她把报告写完。

This paper makes an analysis of the kinematical rules and technical characteristics of movement-round-off spring back handspring and bent leg back flip with 2 twists in Yang Wei s vaulting horse,in order to provide the theoretical basis and technical parameter for its further development in China.

通过运动学分析揭示了我国优秀体操运动员杨威完成的跳马踺子后手翻屈体后空翻2周的运动学规律与技术特点，为我国运动员发展此类动作提供了理论依据和技术参数。

Using an offset printing press business card printing and membership card making aluminum foil on the back of the paper is particularly prone to failure, because get dirty foil epikarst no osmosis, even if only a comparison between the thin and India ink layer as well as spraying to prevent rubbing against dirty on the back.

用胶印机制卡和会员卡制息铝箔纸格外便当爆发背后蹭脏障碍，因为铝箔纸的不深层合座操纵不合泌本领，即使只印比辛不薄的不朱层，也必给用喷粉来制止背后蹭脏。

Using concept of magnetic Polaris, this paper derives read-back signal of heads, and computes influence impacted on read-back signal by adjacent bit magnetic transitions and adjacent track magnetic transitions.

采用磁偶极子概念对磁头的读出信号进行了数学推导，并计算了相邻比特磁化翻转及相邻磁道磁化翻转对读出信号的影响。

In this paper, an improved sensorless control strategy, which is based on the detection of zero crosspoints of back-EMF, is proposed. In this method, only one feed back signal is needed to sense terminal voltages and no motor neutral line is required. The phase shifter errors in traditional methods are eliminated.

本文同时提出了一种改进的无位置传感器检测方法，这种方法基于反电势过零点检测的基本原理，采用单路位置反馈信号，无须引出电机中性线，硬件结构简单，消除了传统检测方法中由于深度滤波产生的相移和误差。

This paper systemically introduces the history and current status of the study on the problem of orthotropism and displacement back analysis, recounts and concludes the analysis theory about anisotropic rock mass, brings forward some models of displacement back analysis of the rock such as layered orthotropic model, proportional coefficient model, layered homogeneous model and equivalent simplificated model, and establishes target unknown, target functions and arithmetic for these models respectively, through analyzing the character of layered orthotropic rock mass.

本文系统介绍了正交各向异性问题和位移反分析方法研究的历史与现状，叙述与归纳了各向异性岩体的分析理论，通过分析成层正交各向异性岩体的特点，对该类岩体的反分析方法提出了分层正交各向异性模型、比例系数模型、分层均质模型和等效简化模型，并对各类模型分别确定了目标未知数、目标函数与算法。

In the paper, a back commutation mathematical model based on heat restrike is built according to the interrupting process. Solving differential equations for the mass, momentum and heat balance, the back commutation of low voltage current limiting circuit breaker is simulated.

根据实际开断物理过程，建立了以热击穿为主的背后击穿物理模型，运用气流场，结合热场、磁场与电流分布，计算模拟了低压限流断路器在开断过程中电弧运动状况与背后击穿现象。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。