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In view of the uncertain load disturbances and parameter variations and so on, the disturbance restraint performance of the six-phase synchronism motor control system for the ship electric propulsion is improved under the robust control theory.

在船舶的空间运动模型和螺旋桨四象限模型的基础上,综合考虑船舶和螺旋桨地相互作用,建立了船桨一体化的运动模型,并结合六相同步电功机控制系统仿真研究船舶电力推进六相同步电动机控制系统典型工况下的运行性能。

Following the introduction of the basic principle of OFDM, some nonideal effects on the performance of OFDM systems are discussed, such as carrier frequency offset, symbol timing offset and sampling clock deviation.

本文在简要介绍了OFDM的基本原理、关键技术的基础上,针对同步问题进行了深入研究。首先分析了同步偏差中的频率偏差、符号定时偏差及采样时钟偏差对系统性能的影响。

The Wide Area Measurement System is based on Synchronized Phasor Measurement and the technology of modern communication.

基于同步相量测量和现代通信技术的广域测量系统(Wide Area MeasurementSystem,WAMS)可以提供电力系统多个节点的同步信号,这些广域信号均是实时测得的,具有较高的精度和可信度。

At first, the domestic and international current situation of research and development trend of digital readout technology are introduced.

本文首先介绍了国内外数显技术的研究现状及发展趋势,然后分析、论述了感应同步器数显表的工作原理,在此基础上对感应同步器数显表测量系统的设计进行了较深入的研究。

The results of the research show that self synchronization closed loop control system through detecting the position of zero value of rotating EMF is new and feasible. In principle it solves the problem how to obtain the accurate rotor position of a step, motor from motor parameters. In design it makes the system simple and practical.

研究结果表明,本文研究的永磁感应子式步进电动机自同步闭环系统在原理上,通过旋转电势过零检测解决了能否利用电机参数获得准确的位置控制与自同步运行问题;在方法上采用数字信号逻辑辩识增强了系统的稳定性,解决了系统实现能否简单实用的问题。

The self-excitation criterion of single-machine is difficult to apply to multi-machine power system, so the mathematical model to judge the self-excitation of all generating sets in multi-machine power system is researched.

1引言随着同步发电机组单机容量的增大和远距离负荷中心电站的建设,以及电力系统容量、电压和输电距离的不断发展和提高,许多问题随之产生,同步发电机的自励磁问题就是其中之一。

As such, it can be used to protect c ritical sections of the code from interruption and shared resources from simul taneous use.

一个互斥基本上是一个多任务敏感的二元信号,它能用作同步多任务的行为,它常用作保护从中断来的临界段代码并且在共享同步使用的资源。

It has function of the common tailstock, and that can rotate and clamp synchronization with the table.

工作时,利用主机的控制系统或专门的控制系统控制转台,既可实现普通尾座的功能,又能够实现与工作台的同步回转,同步刹紧。

Combining the study characteristic and the current construction method of the bi-arch tunnel in domastic and aboard, the paper deeply study the middle heading construction method and the benching tunneling construction method.

结合目前国内外对双连拱隧道的研究特点以及国内外对双连拱隧道施工方法的现状,本文针对中导洞施工左右主洞不同步开挖和理想的同步开挖法进行了较为深入的研究工作。

The new GV preparation method we developed allowed the best visualization of chromatin distribution after Hoechst or CMA3 staining. Our results showed that GV chromatin configurations are different among different species, and thus, while chromatin condensed into a ring around the nucleolus in porcine and bovine oocytes, no such a ring was observed in caprine oocytes; Porcine oocytes were synchronized at GV1, goat oocytes at GV3n and bovine oocytes at GVf configurations before GVBD occurred, indicating that these configurations are progressive towards final maturation rather than atresia; Changes of chromatin configurations were associated with gene activity of transcription; GV chromatin configurations were affected by the environmental changes such as serum starvation and elevated temperature.

应用该技术对猪、山羊和牛不同大小、不同健康程度卵泡及体内和体外成熟过程中卵母细胞染色质构型的变化发现:1)不同动物卵母细胞染色质构型不同;猪和牛卵母细胞染色质围绕核仁凝集形成环,但山羊卵则没有此环。2)卵母细胞在GVBD之前都同步在某一染色质构型;猪同步在GV1,山羊GV3n,牛GVf,说明这些染色质构型代表着进行性变化。3)染色质构型的变化反映基因转录活动的变化。4)染色质构型受环境变化的影响。

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I didn't watch TV last night, because it .

昨晚我没有看电视,因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来,在北京的很多小区里,电梯液晶电视被撤了下来。

I'm running my simile to an extreme.

我比喻得过头了。