双动

At first,the prin ciple of BLDCM is analyzed and the model is built;then a test is performed on a tining system of close loops of speed and current;torque ripple components are r educed by controlling switching andles of the PWM.

文中首先建立永磁无刷直流电机的数学模型，以此进行转速和电流双闭环调速系统控制；并通过调节 PWM发生器的开关频率来减少转矩脉动。

Methods: 60 patients with good temporal window and 25 patients with poor temporal window (bilateral: 8 cases, unilateral: 17 cases) were examined by TCD. Systolic velocity, mean velocity, diastolic velocity, and pulsatility index in MCA were evaluated. 6 cases out of 60 patients with good temporal window were measured in transoptical and transtemporal detecting angle by MRI.

对颞、眶窗检测信号良好的60例患者分别在2个部位测定MCA的峰值流速、平均流速、舒张末期流速和脉动指数，对其中6例行MRI检查者测量了经颞及经眶的检测角度；另对25例颞窗双侧或一侧缺如者行眶窗检测MCA。

According to the definition and the distribution of VSR's voltage space vector, the introduction of a rule-based SVPWM current control strategy, with non-fixed switching frequency and dual hysteresis loops, that obviously improves the performance of current control. Based on two kinds of control strategies of VSR under unbalanced grid condition, the introduction of a new VSR control strategy featuring undamped-oscillation that simplifies the controller structure and effectively improves VSR's performance under unbalanced grid condition. A systematic description of the state switching in trilogic PWM signal generation of threephase CSR by using the conversion between bilogic and trilogic switching functions.

作者在如下工作的基础上对PWM整流器的一些关键问题提出了自己的研究思路、观点和方法：根据PWM整流器网侧矢量关系，直观地描述了其四象限运行的基本原理及特征；定量分析了VSR、CSR的PWM换相过程及波形特征；引入等效变压器模型并详细分析了VSR、CSR基于d—q模型的动、静态特性；提出了满足四象限有功、无功运行指标时的VSR交流侧电感设计方法；并提出了依据控制系统跟随性和抗扰性性能指标设计VSR、CSR直流侧储能元件的参数计算方法；在研究了VSR电流控制策略基础上，提出了影响VSR电流控制的几个要素，并进行了定量分析；根据VSR空间电压矢量的定义及分布，提出了基于规则控制的不定频滞环空间矢量PWM电流控制策略，并由此提出了具有双滞环特性的不定频滞环优化SVPWM电流控制策略，有效地改进了滞环PWM电流控制性能。

The complicated oil field of karst cave and crack are controlled by limestone reservoir and the crevices-cave system, which have many characteristics such as vivid and great in style, irregular distribution, the limestone cave in crack and unhomogeneity of rock etc.

笔者力求充分利用各种开发生产的动态信息，探索研究和评价储层特征的方法及思路，主要研究成果如下：(1)结合塔河油田动静态分析和实践，将缝洞型碳酸盐岩油藏划分为三类组合模型：缝-洞系统、双裂缝系统和缝孔系统。

That Apple is able to provide true 2-way dual balanced-armature phones, with this level of audio performance, at this price point, boggles the mind.

这款耳机的性价比无懈可击，它绝对可以比拼4倍于其身价的耳机，苹果能提供了达到如此高水准和低价格的双单元动铁耳机，难以置信。

It use two disparting surface,and its frame is fast.It use point moulding gob,so,it can fall off automatism.When it is pulled out ,the pulling pole pull the product and accomplish the pulling of its side concave . The design project is divided into two parts. The first part is about the working theory and application of a plastic injection mould, the principle of designing and the introduction of the production about plastic mould.

它采用双分型面分型，结构紧凑；采用点浇口，且浇口可以自行脱落；顶出时，由推杆和斜顶杆顶出制品并完成制品内侧凹的抽芯；模具定模上的水道以多支回路分别冷却，动模一侧的型芯由三组水道分别冷却。

It use two disparting surface,and it's frame is fast.It use point moulding gob,so,it can fall off automatism.When it is pulled out ,the pulling pole pull the product and accomplish the pulling of it's side concave . The design project is divided into two parts.

它采用双分型面分型，结构紧凑；采用点浇口，且浇口可以自行脱落；顶出时，由推杆和斜顶杆顶出制品并完成制品内侧凹的抽芯；模具定模上的水道以多支回路分别冷却，动模一侧的型芯由三组水道分别冷却。

On day 21 of pregnancy, the fetuses and placentas in both groups were surgically taken an...

结论采用双侧子宫动静脉中段部分结扎法可建立良好的IUGR动物模型。

This paper aims at the research of line words, which are composed of action morpheme and the noun morpheme .All these line words comes from "Modern Chinese Dictionary".

本文研究的对象是动、名语素组合成的离合词，研究的范围是《现代汉语词典》中所收录的能插入其他成份的双音节词语。

In this paper, incising blasting engineering in granite row stone exploitation as the research object, in order to analyze the fracturing mechanism principles of V-shaped notch blasting and the influence of blasting parameter changing to V-shaped notch blasting effect, the elastic-plastic isotropy and multi-notched hole of plane strain model is set up. Dynamical finite element analysis software ANSYS/LS-DYNA is applied to calculate dynamic stress distribution and its change rule of rock around notched holes and between two holes, and dynamic fracturing mechanism is analyzed with fracture mechanics theory.

文章以花岗岩荒料开采中的切割爆破工程实践为研究对象，为分析V形刻槽爆破成缝机理及爆破参数改变对刻槽爆破效果影响等内容，建立了各向同性脆性材料的多刻槽孔准平面应变模型，以显式动力分析有限元程序ANSYS/LS-DYNA为模拟运算工具，详细计算了在动载作用下槽孔周围及双孔连心线上岩体的动态应力分布与变化规律，并运用断裂力学理论分析刻槽爆破动态成缝机理。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。