查询词典 constant current

In this dissertation, losses in CLIM are obtained by means of solving steady state eddy current fields using FEM under constant voltage excitation.

在计算中，应用传热学知识，首次得出了动初级圆筒型直线感应电机内表面上的散热系数。

This text has studied the historical origin and realistic background of the sustainable development thought; has narrated current situation and trend of domestic and international sustainable development research; has provided the definition of regional sustainable development on the foundation of analyzing constant concept; has stressed the rationality, systematicness and practicality of sustainable development; has set up the conceptual model of regional sustainable development, structured the regional sustainable development evaluation index system frame and appraise models; has studied the judge base of regional sustainable development.

本文探讨了可持续发展思想的历史渊源和现实背景，综述了国内外可持续发展研究现状和趋势；在剖析可持续性概念的基础上探讨了区域可持续发展的定义，突出了可持续发展的区域性、系统性和实践性；建立了区域可持续发展的概念模型，构建了区域可持续发展评价指标体系框架和评价模型，探索了区域可持续发展的判断依据。

The natural relationship of Gravitational Constant is also concluded:, In which from definition of must basic unit of current intensityor coulomb in classical physics, the measuring principle of unit charge and the gas kinetics are combined, and the formula of relative theory of mass is used, by the use of the methods of logical inference with concludiung synthesis.

运用逻辑推理和归纳综合相结合的方法，从经典物理学的源头--电流强度单位的定义和电量单位的定义出发，结合元电荷测定原理、气体分子动理论以及相对论质量公式，导出了万有引力常量G的关系式：，解释了G的测量值的大小、变化及其范围，消减了一个物理基本常数。

Many prominent U.S. financial figures, both in and out of government, have stated that our current-account deficits cannot persist. For instance, the minutes of the Federal Reserve Open Market Committee of June 29-30, 2004 say:"The staff noted that outsized external deficits could not be sustained indefinitely." But, despite the constant handwringing by luminaries, they offer no substantive suggestions to tame the burgeoning imbalance.

许多重量级的美国财经学者，不论是当政的或是在野的，都一再重申，目前的经常帐赤字绝非常态，举例来说，美国联邦准备公开市场操作委员会于 2004 年 6 月 29-30 日的会议记录中便提到，幕僚群已注意到我们绝对无法负荷长期大量的外部赤字，尽管一些重量级人物不断大声疾呼，但实际上他们还是无法提出彻底解决贸易赤字的具体方案。

Many prominent US financial figures, both in and out of government, have stated that our current-account deficits cannot persist. For instance, the minutes of the Federal Reserve Open Market Committee of June 29-30, 2004 say:"The staff noted that outsized external deficits could not be sustained indefinitely." But, despite the constant handwringing by luminaries, they offer no substantive suggestions to tame the burgeoning imbalance.

许多重量级的美国财经学者，不论是当政的或是在野的，都一再重申，目前的经常帐赤字绝非常态，举例来说，美国联邦准备公开市场操作委员会于2004年6月29-30日的会议记录中便提到，幕僚群已注意到我们绝对无法负荷长期大量的外部赤字，尽管一些重量级人物不断大声疾呼，但实际上他们还是无法提出彻底解决贸易赤字的具体方案。

ABSTRACT Aiming at problems of trans-vector controller in a vehicle-carried induction motor such as variable rotor and stator resistance following motor temperature, and their inductance varying with flux saturation degrees. Firstly, CSI and VSI are introduced, for CSI, it can hold the advantages both FOC and DTC using stator flux directional, PI parameter and simulation are also introduced. Secondly, equations of IM in the synchronous rotary frame and its static counterpart, as figuring in the saturation condition of magnetic field, are dealt in this paper and the simulation results are presented. Thereafter, the parameter designing of PI trans-vector controller is processed, which features the non-linear model. In practical realization, as neglecting the dynamical change of motor inductance, this paper employs online modification of inductance parameters, according to the flux saturation, then transforms the non-linear equations into linear ones, and so compacts the structure of controller. Thirdly, in view of the maximum torque output is extraordinary requisite when Electrical Vehicle start up, accelerate, and overtake, this paper issues the maximum torque when both inverter and battery capacity is corporeally definite. Fourthly, on-line differentiating and analyzing both rotor's time constants and its flux by using the expanding order reduction and discrete Kalman filter equation are fathomed, in order to realize high-performance trans-vector algorithm, and also the simulation results are presented. Fifthly, the close-loop regenerative brake system, when the EV's torque is set constant, is deduced; at the same time, unification of electric drive model and brake model is executed. Combined with maximum charge current demands, the mathematical model for online yielding torque as a demand.

本论文针对车载异步电机在矢量控制器所遇到的问题：定转子电阻随温度变化及随电机饱和程度变化的转子电感及定子电感而影响电机调速性能提出一套完整的解决方案：分析了电流型逆变器和电压型逆变器在实现矢量控制时控制器参数的计算，分析出对于电流型逆变器在采用定子磁场定向时，其性能同时具有矢量控制和直接转矩控制两者的优势，并对电压型逆变器在转子磁场定向下的模型进行了仿真研究；建立异步电机非线性模型，推导出考虑磁饱和时异步电机在同步旋转坐标系及静止坐标系下的方程，并做出了仿真结果，建立异步电机在非线性模型下的矢量控制调节器的PI参数设计，在实际应用中，若忽略电机电感的动态变化，可以根据当前的磁路饱和状态而在线修正电感参数，从而将非线性方程线性化，降低控制器的复杂度；考虑到电动汽车在起动和加速超车时需要电机有最大转矩输出，本文讨论在逆变器容量一定和电池供电能力有限的情况下电机最大转矩输出问题；推导了异步电机扩展降阶、离散卡尔曼滤波方程在线辨识转子时间常数和转子磁通，用于实现高性能的矢量控制算法，并给出了仿真结果；推导出了电动汽车恒转矩给定的闭环回馈制动系统，实现了电动控制模型和制动模型的统一，而且结合铅酸电池最大充电电流的要求，为制动转矩在线给定建立了数学模型；设计了基于双DSP系统的高性能矢量控制器软硬件框图，并以大量实验数据说明矢量控制在电动汽车应用的实际应用状况。

In the current information-intensive society , with the constant growth of infare such as the ackstage supporter , stand , as target , develop with coal gas one can meet management expectancy " whether coal gas stand administrative system " to a certain extent.

本论文就是以Delphi7.0为前台和ACCESS2000为后台等软件作为开发工具，以煤气站为对象，开发一个从某种程度上能满足管理要求的"煤气站管理系统"。

The polarization stability of the samples poled by constant voltage corona charging was investigated by means of measuring the open-circuit thermally stimulated discharge current-temperature spectrum, the electro-optical coefficient and the isothermal surface potential decay.

样品用恒压电晕充电法极化，通过测量电光效应的等温衰减监测偶极子有序取向稳定性，用开路热刺激放电、等温表面电位衰减测量等手段分析了材料的电荷动态特性。

Polarization curve and constant potential polarization experiments showed that AE events rate is linear to polarization current density.

极化曲线和不同恒电位下极化的声发射测量显示，声发射事件率与极化电流密度近似成线性关系，说明无论是阳极溶解还是铝合金的阴极腐蚀都是重要的声发射源。

The chip uses a constant frequency, current-mode control scheme to provide excellent line and load regulation.

采用了恒定频率、电流模式的控制结构以提供优秀的电源和负载稳压。

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。