空间

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1，title的写法titleQQ空间，QQ空间播放器，QQ空间播放器代码，QQ空间免费播放器，留言代码，免费皮肤/title重点突出播放器

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。

The existence ofpolar nanoregions dramatically influences the extrinsic dielectric nonlinearityof paraelectric phase. 5 Slow relaxations of field induced piezoelectricresonance of paraelectric barium stannate titanate were observed after eitherapplying or removing a DC bias field. This phenomenon is attributed to slowspace charge dipoles formed by injected homocharges and validated by theobservation of a negative piezoelectric constant. Isothermal study ondielectric constant and discharging current after application or removal of astep field were performed. The relaxation laws in ferroelectric andparaelectric phases are different. The transportation of homocharges arebelieved to be responsible for the strong relaxation behavior in paraelectricphase. Domain wall can trap space charges thus the relaxation in ferroelectricphase is relatively weak. Abnormal phenomena, such as slim-waisted hysteresisloops, abnormal C-V curves and clockwise reversible hysteresis loops observedin barium stannate titanate ceramics, were attributed to pinning of gatheredpoint defect on domain walls.

5研究了直流电场施加和撤除引起的钛锡酸钡顺电相场诱压电谐振慢弛豫现象，认为这是同极性空间电荷注入形成空间电荷慢偶极子导致的，观察到的负压电常数证实了这个观点；研究了等温条件下阶跃电压作用下介电常数和放电电流的慢弛豫现象，发现钛锡酸钡陶瓷的铁电相和顺电相呈现不同的宏观性能时间依赖规律，认为是同极性空间电荷的输运过程导致了顺电相样品呈现强的弛豫行为，铁电相中存在畴壁捕获空间电荷的机制因而其弛豫行为较弱；研究了钛锡酸钡陶瓷中束腰电滞回线、反常 C-V 曲线和顺时针可逆电滞回线等反常现象，将其归因于点缺陷的聚集对铁电畴畴壁的钉扎作用，多次电场循环有助于解除这种钉扎状态，减弱反常特征。

Using the innovative design method based on mechanism combination, taken four-wheeled, six-wheeled and eight-wheeled space-exploring robot as research object,we have got as many as sventy new kinds of isomorphic combination localmotion platforms and one hundred and sixty five new kinds of isomerous combination locomotion platforms.

以四轮、六轮和八轮空间探测机器人为研究对象，采用基于构形组合的空间探测机器人设计方法，得到70种新型同构组合空间探测机器人移动机构和165种新型异构组合空间探测机器人移动机构。

At last, we can conclude that these cases can be divided into two kinds: one is the series-wound space with the alternant emergence of the node space, and the other is the assembled space with the well organized special interface.

最后，笔者将它们归纳成两类：节点空间交替出现的串联路径空间和重视空间界面组织的组合路径空间。

The drive unit includes a drive shaft (3), which is arranged to carry the centrifuge rotor (2) and is rotatably journalled in at least one bearing member (4, 5), and a casing (6), which delimits an upper space (7), in which the drive shaft and the bearing member are located and a lower space (8) for storing oil.

该驱动组件包括一驱动轴(3)，用来支承离心转子(2)，并以轴颈可转动地支承在至少一个轴承件(4、5)内；一个壳体(6)，它界定一上部空间(7)和一下部空间(8)，驱动轴和轴承件配置在上部空间内，下部空间供贮盛润滑油用。

However, physics in space has not changed the contents of microgravity science.

空间的物理学摘要近些年来，在微重力环境中进行基础物理研究涉及到许多重大的基础物理课题，引起了国际理论物理界的关注，并被称为空间的基础物理学；进而，各国的空间局逐渐将微重力科学称之为空间的物理学，但空间的物理学并没有改变微重力科学的基本内容。

Starting from the development course and demand of landscape, construction of public open space for the citizens was discussed. Then urban public landscape design principles and integration were discussed from dotted-like and linear space perspective. It can be used for reference to create more civilian and ecological urban landscape.

从景观的发展历程到景观的发展需求；阐述了为市民创造公共开放空间；并选取点状空间和线性空间构成；详细介绍了城市开放空间的景观设计原则及其整合；对创建更具大众化和符合生态的城市景观设计具有一定的借鉴意义。

They state that the state space of a system is a Hilbert space and the observables are Hermitian operators acting on that space, but do not tell us which Hilbert space or which operators.

它们规定系统的状态矢量空间是希耳伯特空间以及可见的是作用于空间的哈密特操作者，但是不告诉我们哪个是希耳伯特空间或哈密特操作者。

To create the atmosphere of the whole bar is bound to the bar to work on the space division, different spatial segmentation give people a different style and atmosphere. Symbol form factor while also creating the right atmosphere has a direct impact lighting design and color match will be more abundant throughout the environment, will create the atmosphere and the special effects, coupled with the selection of materials, and more space, more space for beauty.

要营造出整个酒吧的氛围必然要在酒吧空间划分上下工夫，不同的空间分割会给人不同的风格和气氛，同时形态符号要素也对氛围的营造有着直接的影响，光线的设计和色彩的搭配会更加丰富整个环境，会创造出特殊的气氛和效果，再加上材料的选用，更充实了空间，使空间更具有美感。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。