查询词典 grid

We considered that the method of spherical surface waves raytracing basing on the grid combined the virtues of the grid method. It is precise and high efficient in calculating traveltime and raytrace. It is a perfect method of raytracing.

分析认为，基于网格的球面波波前射线追踪方法结合网格法的优点，在计算走时和射线路径时精确、高效，是一种理想的射线追踪方法。

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。

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 three-phase CSR by using the conversion between bilogic and trilogic switching functions.· Referenced to the CSR"s trilogic PWM signal generation, an approach to achieve low-stress natural commutation of switching devices by reshuffling the vector composition sequence, resulting reduced switching loss.

在研究了两类电网不平衡时的VSR控制策略基础上，提出了一种新型的基于无阻尼振荡控制器的VSR不平衡控制策略，在简化控制结构的同时，有效地改善了电网不平衡时的VSR控制性能；·通过二、三值逻辑开关函数间的转换，系统地描述了三相CSR三值逻辑PWM信号发生中的状态切换；·结合三相CSR三值逻辑PWM信号发生规律，提出了通过调整矢量合成顺序而使功率管获得自然换相的低电压应力SVPWM控制，从而有效地降低了功率管的开关损耗。

Referenced to the CSR's trilogic PWM signal generation, an approach to achieve lowstress natural commutation of switching devices by reshuffling the vector composition sequence, resulting reduced switching loss. With the background of and well instanced by the Xinjiang Autonomous Region's Key SciTech Project"Solar Photovoltaic grid-connected inverter", the dissertation work implemented the new approach of a grid-connected PV inverter that was of single-phase VSR topology and with MPPT .

在研究了两类电网不平衡时的VSR控制策略基础上，提出了一种新型的基于无阻尼振荡控制器的VSR不平衡控制策略，在简化控制结构的同时，有效地改善了电网不平衡时的VSR控制性能；通过二、三值逻辑开关函数间的转换，系统地描述了三相CSR三值逻辑PWM信号发生中的状态切换；结合三相CSR三值逻辑PWM信号发生规律，提出了通过调整矢量合成顺序而使功率管获得自然换相的低电压应力SVPWM控制，从而有效地降低了功率管的开关损耗。

In the traditional environment,the services which maintain the secure and reliable operation of the grid include reserves,and these services were provided by the generators that owned by the grid;however,under the electric market condition,generators are unbundled fro...

传统电力工业环境下，维持系统安全可靠运行的备用服务由电网拥有的发电厂无偿提供；而在电力市场环境下，发电厂从电网公司分离出来，提供备用服务与否就成了发电厂自己的选择。

I intend to uncast any machinery or patterning that is non-karmic and suspends my space between more than 25% between my etheric skin or genetic grid work and ascension grid work.

我意愿将我以太皮肤、遗传晶格层及提升晶格层之间的间隔空间维系成超过25％的、性质为非业力的任何机械或模式全部扔掉。

A statistical analysis on a reference grid image in a ununiformity illumination field is proposed. On that basis a grid signal extraction project is presented.

本文对非均匀照明场中参考格栅图像作了统计分析，在此基础上提出了一种格栅信号提取方案。

We have many products to sell. Such as the wind generators with on-grid, off-grid, and eolic photovotaic, all kinds of solar panels of monocrystal, polycrystal and noncrystal silicons, solar generating systems and powerstorage accumulators.

产品有风力发电机、风光互补微风发电机、各种类型太阳能板（单晶硅、多晶硅、非晶硅）、太阳能发电系统和蓄电池销售。

Studying the delaminating and districting operation from the point of program and over viewing the future development of Zhenjiang grid; putting forward the new districting operation program that is suitable for the development of Zhengjiang grid, and then giving the total principles in the future program.

提出了适合镇江电网发展的新的分区运行方案，并给出了镇江电网今后规划的总体原则。

Materials and methods: The method of the electron grid therapy is to place a cerrobend grid on the end of an electron cone. Film dosimetry was used to measure the relative surface optical density and depth profile of grided electron beam with energies of 6 to 14 MeV.

材料与方法：使用底片测量术的方法，观察当15×15cm^2铅合金网眼板上的网眼孔径大小(d=0.45， 1.0， 1.5 cm)、网眼之间的间隔宽度(s=0.4， 0.2cm)不同时，以不同能量的电子射束(6、8、10、12、14 MeV)照射剂量50 M.U。，对底片的相对表面平均光密度及深度等光密度曲线分布情形所引起的变化。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。