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seven-level
相关语句
  七层
     The present model with the considerations of more physical processes is largely based on thenorthern hemispheric seven-level spectral model.
     本模式是原北半球七层原始方程谱模式的发展,它包含了较完整的物理过程。
短句来源
     The International Standard Organization (ISO) has defined a seven-level reference model that is known as "Open System Interconnection" (OSI). This model has been approved by the Consultative Committee on International Telegragh and Telephone (CCITT), and becomes international standard of network and communication.
     国际标准化组纸已推出一种开放式系统互连七层参考模型,这一模型已得到国际电报电话咨询委员会的承认,成为国际上网络通信的标准化基础。
短句来源
     (3)the forecasts in the lower latitude areimproved by use of some methods from the seven-level spectral model (such ashorizontal diffusion process);
     采用了七层谱模式中对低纬的改进预报方法(如对水平扩散过程),以改进T42L10在低纬的月预报结果;
短句来源
  “seven-level”译为未确定词的双语例句
     Research on Control of Seven-Level Cascaded H-bridge Inverter Based on DSP and FPGA
     基于DSP和FPGA的七电平级联H桥型变流器的控制研究
短句来源
     The Study of Hybrid Seven-Level Inverter in Frequency Control Device
     混合级联型七电平变频调速装置的研究
短句来源
     In this paper, one phase five-level、seven-level、 nine-level power magnify has been realized through CPS-SPWM technique based on DSP+CPLD hardware platform.
     在第三章中详细介绍了通过DSP+CPLD硬件平台实现基于载波相移技术的单相五、七、九电平控制脉冲的过程,对各个电平输出的总谐波畸变率、传输带宽、实现的复杂程度、应用场合进行了分析。
短句来源
     In this paper, a Phase Shifting Space Vector Modulation (PSSVM) approach is introduced firstly to simpli-fy SVM algorithm for cascaded multi-level inverters. Then Digital Signal Processor (DSP) and Complex Programmab1e Logic Device (CPLD) is used to realize PSSVM control of three-cell cascaded seven-level inverter. The experimental results indicate that the control method is feasible.
     为简化级联型多电平逆变器空间矢量PWM算法,提出了一种基于单元矢量移相叠加的空间矢量PWM控制方法(Phase Shifting Space Vector Modulation,PSSVM),采用数字信号处理器(Digital Signal Processor,DSP)和可编程逻辑器件(Complex Programmable LogicDevice,CPLD)实现了对三单元级联型七电平逆变器的PSSVM控制,实验结果表明该控制方法可行,而且与传统多电平SVM方法相比,计算简单,易扩展。
短句来源
     The hybrid frequency carrier-based PWM control strategy adapted to hybrid power cells is presented in this paper based on the analysis of hybrid seven-level power conversion principle.
     该文在分析混合七电平逆变电路工作原理的基础上,提出了一种适合混合功率单元的混合频率载波PWM调制法。
短句来源
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  相似匹配句对
     Groe of SEVEN
     "七人社"的风采——加拿大画廊漫记
短句来源
     Su Seven
     苏七块
短句来源
     ON THE SEVEN-POINT CHAIN
     关于七点链
短句来源
     A Seven-Dollar Dream
     七美元的梦想
短句来源
     The level of E.
     为探明接种E.
短句来源
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  seven-level
Given the authentic classroom conditions in which this study took place, the results are promising for the classroom utility of the seven-level conception of student engagement with software.
      
KU-Alk4, a newly isolated white-rot fungus, a seven-level Box-Behnken factorial design was employed to optimize the culture medium composition.
      
Results reveal eleven diagnosable behavior patterns arranged within a seven-level hierarchical structure.
      
The effects on non-target species were measured using two different damage scales (three- and seven-level scales) depending on the morphology of the taxa.
      
This paper describes a new control method for the integrated of six current rectifiers-seven-level diode-clamped inverter feeding induction motor considering dc-link capacitors voltage balancing problem.
      
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The initialization scheme of nonlinear balance equation is a moreusefulmethod not only in the balance model but also in the primitive equationmodel.But as we know that the routine method for solving the nonlinearbalance equation contains the exaction of the square root,this operationconsists of many operations of arithmetic in computing.Especially this cal-culation is to be performed at every gridpoint in every step of iteration,and to be required more iteration times.So the amounts of computa-tions are considerably...

The initialization scheme of nonlinear balance equation is a moreusefulmethod not only in the balance model but also in the primitive equationmodel.But as we know that the routine method for solving the nonlinearbalance equation contains the exaction of the square root,this operationconsists of many operations of arithmetic in computing.Especially this cal-culation is to be performed at every gridpoint in every step of iteration,and to be required more iteration times.So the amounts of computa-tions are considerably large.In this paper,a new and very efficient method for solving the non-linear balance equation is proposed,and the difficulties mentioned abovehave been already removed.The experiments on medium-range numerical weather prediction are per-formed by using the seven-level spectral model with different initializationschemes including the nonlinear balance equation,linearbalance equation,“non-geostrophic stream function”,and simply geostrophic wind.From the results,we can see that the nonlinear balance equation initialization scheme isthe best one.Because of the absence of nonlinear terms in the linear ba-lance equation initialization scheme,the forecasting results of weather sys-tem are rather smooth and weak.

本文给出了一种求解非线性平衡方程的新的有效的方法及有关的数值试验结果。和以往的求解方法相比,本方法的优点是:收敛速度快,不需要冗长的迭代计算,也不需要对初始高度场的某些记录作修改,并能节省大量的计算时间。文中利用北半球土层原始方程谱模式,使用了1982年的客观分析资料,进行中期数值天气预报试验。试验结果表明,用非线性平衡方程初值化方法制作中期数值预报比其他的如线性平衡方程初值化方程的更佳。后者因去掉了非线性项的作用,天气系统的强度预报结果偏弱且偏平滑。

This paper deals with the design and implementation of a cheap communication subnet for a wide-area computer network.The sub-network utilizes the telephone system already existed as phisical channels for data communication between computers,sub-network has the following functionscalling other stations and answering a call to establish a phisical channel automatically.recognizes between votces and data signals automatically.implements data link layer and network layer protocols for the network.Various hosts can...

This paper deals with the design and implementation of a cheap communication subnet for a wide-area computer network.The sub-network utilizes the telephone system already existed as phisical channels for data communication between computers,sub-network has the following functionscalling other stations and answering a call to establish a phisical channel automatically.recognizes between votces and data signals automatically.implements data link layer and network layer protocols for the network.Various hosts can be connected to the subnetwork.A large computer network thatconforms to the OSI seven level model can be constructed by implementing higher layers protocols of the OSI MODEL in host computers.

本文介绍了一种廉价的计算机远程通信子网的设计方案及其软硬件的实现。该通信子网利用了国内现有的电话系统作为网络的物理信道,实现计算机之间的数据通信。该子网主要实现以下功能:(1)以自动呼叫自动应答的方式建立物理信道;(2)实现话音/数据通信的自动判别与处理;(3)实现OSI模型的低三层协议。 由于本文所讨论的通信子网是通用的,因而在子网的外面配接不同的接口板就可将不同的后台主机接入网内,在后台主机内配上与OSI模型相对应的高层协议软件就可构成一个符合OSI七层模型的计算机远程网络。

The Cambrian stromatolites in North China generally are not well-deve- loped and relatively less in amount,in some areas,however,they are distri buted widely and richly in some lithological formations and members.Abun dant stromatolites are found in most of the formationsand members in some places.The stratigraphic levels of the stromatolites: Except for the Mantou,Maozhuang,and Xuzhuang Formations,in which there have not been found strornatolites so far,all the other five forma- tions of the three series contain...

The Cambrian stromatolites in North China generally are not well-deve- loped and relatively less in amount,in some areas,however,they are distri buted widely and richly in some lithological formations and members.Abun dant stromatolites are found in most of the formationsand members in some places.The stratigraphic levels of the stromatolites: Except for the Mantou,Maozhuang,and Xuzhuang Formations,in which there have not been found strornatolites so far,all the other five forma- tions of the three series contain abundant stromatolites which occur mainly on seven levels and in more than ten types. The characteristics of the Cambrian stromatolites in Northern China: Generally larger individuals,simple shapes and less types.They are repre- sented essentially by stratified-stromatolites,stratocolumnar-stromatclites, columnar-stromatolites,and spherical stromatolites,most of which contain rich organism and are furnished with obvious biological structure,some of them also contain traces of biological disturbance and are found to co-exist with trilotites.

中国北部寒武纪的叠层石,过去很少有人进行研究,一般的初步印象是叠层石发育不好而相对贫乏。通过初步工作发现在有些地区,其分布还是较广泛的,在局部地区多数组段中,都含有非常丰富的叠层石。目前除馒头组,毛庄组、徐庄组尚未发现叠层石外,三个统其余的五个组中都含有叠层石,共有七个主要层位,十几个不同的类型。中国北部寒武纪叠层石的特征是:一般个体较大,多数形态简单,类型较少,以层状,层柱状、柱状和球状叠层石为主。多数含有机质并具明显的生物结构,有的还见有生物扰动的痕迹并与三叶虫共生。

 
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