追踪器

The objective of this research was control a long stroke inchworm type positioning stage. Consider the factors that may affect positioning precision include the nonlinearity of piezoelectric actuator and phase lag cause by feedback control. Use model of hysteresis and zero phase error tracking controller to improve the tracking ability and reduce the phase lag of the system.

因此在本研究中，对於一个蚇蠖式长行程平台研究控制方法，考虑可能影响定位精度的因素，包括压电致动器的非线性特性与系统因为闭回路控制架构造成的响应相位落后现象，利用迟滞数学模型的建立与零相位误差追踪控制器的设计来改善系统的追踪能力与相位误差。

Much of what we know about storms—and especially much of what we see about them on TV—comes from self-made storm chasers.

我们对风暴的大多认识以及我们在电视上对风暴的大多所见来自自制的风暴追踪器拍摄的画面。

The company is committed to the main track GPS positioning navigation system and traffic safety warning, the general non-electronic dog gun, satellite eyes GPS-828, GPS gun for the production and marketing.

目前 公司主要致力于GPS定位追踪导航系统及交通安全警示器、非一般电子狗类测速器、卫星眼GPS-828、GPS测速器的生产和销售。

Constance: A tracking device, I'm doing it for your own good, nacho, before you do something you'll regret.

追踪器，我是为了你好，辣玉米片，免得你做了后悔的事。

Researchers used cell-phone-like tracking devices, for example, to record the Arctic migration of narwhals, a whale with a long twisted tooth, and remotely operated submersible s to reach several kilometers down into the oceans to study delicate marine animals that are impossible to collect.

研究人员使用手机——像追踪器，例如，为了记录北极独角鲸的迁移情况，发现每头鲸有一颗长长的扭曲的牙；还可以远程遥控潜水艇达到几公里下的深海区研究灵敏的不易搜集的海洋动物。

NThe remaining trackers will not be loaded.

n其余的追踪器将不被加载。

Once you manage to get an account in these private trackers, you will be able to access to fastest seeders and hence fast download speed, beside best online contents.

一旦你设法得到一个帐户，在这些私人追踪器，你将能够获得最快的seeders ，因此快速的下载速度，旁边的线上最好的内容。

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。

Like the Gila monster, which attacks with venom, inflicting festering but fatal wounds? Or merciless assassin snakes with switchblade fangs as sharp as hypodermic needles and enough poison to kill ten people. And they are smart-alligators that send coded messages, iguanas that run on water and the green turtle that uses magnetic crystals in its brain to navigate across the ocean. A Diamondback rattlesnake can inject a tracer to track its dying prey and baby snakes fish for trout with their tongues!

有毒的西拉晰蝎不致命但会令人非常痛楚；有弹弓刀般毒牙的蛇的毒液足够杀死10个人；聪明的鳄鱼以密码的读息沟通；能在水上跑的晰蜴和脑部有滋场导航的海龟；能在猎物体内注入追踪器的棱背响尾蛇，还有用舌头捉鱼的幼蛇。

And the new 120 Hz eye-tracker is designed to enhance safety and predictability of the desired outcome.

同时，新的 120Hz 眼睛追踪器确定手术的安全及预期的效果。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。