查询词典 backward current

A modified backward Euler method is developed which enables to increase considerably the accuracy of jump voltage computation as a result of freeing its computing from the influence of the faint asymmetrical initial current in such an inductive circuit as converter and completely eliminate numerical oscillation in converter simulation as often seen in the case of implicit trapezoidal integration method.

本文提出一种变形的后退欧拉法，用该法对换流器这样的纯电感电路进行跃变电压计算，可完全避免初始电流中微弱的不平衡对跃变电压计算的影响，大大提高了跃变电压的计算精度，并彻底消除了隐式梯形积公法用于换流器仿真时所存在的非原型数值振荡。

The rotors in these motors do not require any induced current so they do not slip backward against the mains frequency.

这种电机中的转子不需要任何感应电机，所以他们不会低于主频。

This thesis is divided into six parts. The first chapter is preface, the current status of research in the inverse problems for parabolic partial differential equations is reported; the second chapter is "regularization methods for numerical differentiation and their applications ", in this chapter we investigate many regularization methods from a viewpoint of regularization theory and algorithm, some applications in the inverse problems for parabolic partial differential equations are given; the third chapter is "spectral regularization methods". Based on Fourier analysis, within the framework of regularization theory, we apply the spectral methods to some ill-posed problems. Many numerical experiments are done in order to show the validity of the methods; the fourth chapter is devoted to wavelet dual least squares method and a revised wavelet method; in the fifth chapter,we combine finite difference method with method of lines and apply it to the backward heat conduction problem in time; in the sixth chapter "identification problems for unknown source ", the essence and the degree of two problems related to source identification are pointed out, at the same time, some numerical methods are reported.

本文分为六个部分，第一章前言简要分析了国内外抛物型偏微分方程反问题的研究现状；第二章数值微分的正则化及其应用从正则化理论和算法的角度出发，考察了许多正则化方法，还给出了数值微分在抛物型偏微分方程反问题的一些应用；第三章谱正则化方法是在Fourier分析的基础上，在一般正则化理论的框架下，给出了这种方法在各种不适定问题中的应用，数值实验表明谱方法是有效的；第四章研究了小波对偶最小二乘方法和改进的小波方法；第五章主要研究了有限差分方法结合线方法在时间反向热传导问题中的应用；第六章是未知源识别问题，主要指出了两类未知源问题的不适定程度和不适定本质，同时报告了一些数值方法。

This article embarks from each essential factor of countryside landscape imagin,makes a comprehensive analysis to the basic present situation and the existence question of current countryside landscape, and gives out two questions which the countryside landscape urgently awaits to be solved: One is that the old countryside landscape appears disorder and backward, needding renew; On the other hand, currently a large quantities of new rural reconstruction moved towards the vivid project and the thick rotten copy urbanized pattern which is eager for quick success and immediate gain, leading the rusticity completely loses.

本文从农村景观形态各个要素出发，对当前农村景观现状和问题做了全面分析，得出农村景观亟待解决的两个问题：一是老农村景观秩序混乱，面貌落后，需要更新；另一方面，当前所进行的一大批新农村建设走向了形象工程和城市化模式，乡村风味全然丢失。

Securities broker system of our country is still a mode for corporate security broker. Securities broker system law and regulation, management organization and function construction are imperfect; the current operation mode is backward and difficult to meet the development of network economy and securities market; besides, there are many defects in securities brokers incentive mechanism, the management system of securities brokers and risk pre-control.

我国证券经纪人制度仍然是以证券经纪商为主体的法人模式，证券经纪人制度法律、法规和管理机构、职能建设不健全；现行运作模式落后，难以适应网络经济和证券市场的发展；同时，在证券经纪人激励机制、内部管理制度及风险管理方面存在着缺陷和不足。

This paper discusses the latent parallel characteristic of the forward and backward substitution method in tidal current computation.

本文针对前推回代法的潮流计算的潜在并行特点，对前推回代的在数据结构表达方式进行研究，比较了各种数据结构形式并行性计算速度的影响，并进行了仿真计算。

On the basis of analyzing the current techniques for power flow calculations of distribution network,by improving the traditional forward and backward substitution method ,a calculation applied for the reliable distribution network is presented,which has practicability.

在分析现有配电网潮流计算方法的基础上，通过对传统的前推回代法加以改进，提出了一种适用于辐射配电网潮流计算方法，具有实用性。

The stability of the uniform flow is strengthened due to the effects of the backward looking and the relative current.

应用线性稳定性理论进行分析，得出车流的稳定条件、亚稳态条件及不稳定条件。

Environmental performance of abroad evaluated research and practice to had obtained certain positive result, and relevant research of home and practice are relatively backward however, this as grim as pollution of environment of current our country situation and job requirement bearing are compared extremely unworthily.

国外的环境绩效评估探究和实践已经取得了一定成果，而国内的相关探究和实践却相对落后，这和当前我国环境污染严重形势和任务要求相比极不相当。

The article is decided through the analysis area society, economy grows the current situation to reach on the west basically restrict an element, research thinks low-level, socioeconomy develops industrial structure backward, city changes the standard process shortage of natural resources of slow, water and zoology environment are to bring about benefit of zoology economy system flimsily low, restrict the main factor that this division can develop continuously.

本文通过分析定西地区社会、经济发展现状及主要制约因素，研究认为产业结构低水平、社会经济发展水平落后、城市化进程缓慢、水资源短缺与生态环境脆弱是导致生态经济系统效益低下，制约本区可持续发展的主要因素。

Don't listen to their haver, nothing of that sort.

别听他们胡说八道，根本就没那回事。

But bank's shares trade below their book value, suggesting that investors are skeptical.

但是，银行股票以低于账面价值的价格交易，这一点反应了投资者的怀疑。