零理想

In order to investigate work performance of a micro HCCI free-piston engine, Matlab was applied to simulate its single-impact combustion process. A Zero-dimensional numerical model incorporating global chemical kinetics, heat transfer, blow-by and a perfect gas model were developed.

为研究微型HCCI自由活塞发动机的工作性能，应用Matlab软件对其单次冲击的燃烧过程进行仿真建模，分别建立考虑传热、漏气的零维总包化学动力学模型和理想气体模型，并将仿真计算结果与试验结果进行比较。

Based on the new idea management-6σ and achievements of the quality mangagement of successful enterprises,the paper modifies the traditional cost curve of quality and concludes that the most ideal level of quality is zero-defect .

在分析了新的质量管理理念——6σ科学内涵的基础上，以成功企业质量管理的业绩为事实依据，对传统的质量成本曲线进行了修正，得出了最理想的质量水平是零缺陷这一结论。

The article presents the developing condition of PWM and SVPWM first.Then the theory of SVPWM is discussed in detail.The SVPWM is based on the thought of magnetic chain tracking.It makes the ideal magnetic chain circle of three-phased sysmmetry electric motor supplied by three-phased sysmmetry sine wave voltage for basis,uses the practical magnetic chain vector formed by the different switch modes of three-phased inverter to track the basic magnetic chain circle.During the course of tracking,the inverter changes the switch modes properly to form the PWM waves.Then the modulation wave of SVPWM is analyzed in detail.The modulation wave of SVPWM is implicit,but the analogous modulation wave in A-B-C axis needs to be calculated in order to expose the internal relation of SVPWM and SPWM.That is to show the implicit modulation wave of SVPWM. SVPWM actually is a transformed SPWM ruly sampled by the modulation wave which is injected by the zero prefaces based on space vectors.

本文首先对脉宽调制技术的发展现状进行了综述，在此基础上分析了电压空间矢量脉宽调制技术的发展现状；接着对空间电压矢量脉宽调制技术的基本原理进行了详细的分析和推导，SVPWM是基于磁链追踪的思想，它以三相对称正弦波电压供电下三相对称电动机定子理想磁链圆为基准，由三相逆变器不同开关模式下所形成的实际磁链矢量来追踪基准磁链圆的，在追踪的过程中，逆变器的开关模式作适当的切换，从而形成PWM波；然后详细分析了电压空间矢量脉宽调制技术的调制波，虽然SVPWM法的调制波是隐含的，但是为了揭示SVPWM法与SPWM法的内在联系，需要求出SVPWM在A-B-C坐标系上的等效调制波，也就是将SVPWM的隐含调制波显化；SVPWM实质是一种基于空间矢量在三相正弦波中注入了零序分量的调制波进行规则采样的一种变形SPWM。

For the first frame of the video, the object edge is obtained by an enhanced interactive method; in the remaining frames of the video, a new Snake algorithm is proposed to detect the sharp-angled and concave object contour under the constraint of zero-crossing point , the experimental results of different.

对于初始帧，采用改进的交互方法进行目标的精确定位；在后续帧中，采用零交叉点约束的Snake算法，对具有凹边和尖点特征的复杂目标准确跟踪，获得了理想的实验结果。

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产品主要特点动力强劲、低噪音、高效节能、绿色环保、保用十万公里等特点确保用户十万公里零风险使用，是一汽大柴、锡柴机售后维修时最理想的配套产品，国内四配套行业市场占有率已达到40%，2001年公司被一汽大连柴油机厂授予一级代理商，使我们更好的、更大范围的为广大用户服务。

The pressure in a perfect gas, being directly proportional to the kinetic energy of the molecules, has a lower bound of zero.

理想气体的压力与分子的动能成正比，它的下限为零。

A perfect gas would reach zero volume at absolute zero.

理想气体在绝对零度时，体积会达到零。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。