最后就是对协变和逆变的支持了。
通过把高阶张量写成若干逆变和协变矢量的乘积，直接从变换入手，给出了定义高阶张量协变导数的另一种方法。
This paper discusses another way, which is rewritten as product of a few contravariant vectors and covariant vectors, to define higher order tensors covariant derivative through transformations.
介绍了并联逆变式IGBT变频电源的工作原理及在汽车发动机曲轴淬火上的应用情况。
The working principle of the parallel contravariant IGBT variable frequency power supply and its application in the quenching process of engine crankshafts are introduced.
简要地说明逆变原理及续流回路的作用，提出了绘制续流回路的方法。
The paper briefly explains the contravariant principle and the effect of the return of afterflow, suggests the method of rendering the return of afterflow.
本文介绍一种应用于IGBT逆变式点焊机的点焊控制器。
A controller applied to IGBT inverter spot welding machine is introduced in this paper.
本课题研制了一台单片机控制的逆变式脉冲MIG焊机。
A simple chip microcomputer controlled inverter pulse MIG welding machines is developed in this paper.
提出一种适用于逆变桥臂模块的吸收电路。
This paper presents a novel passive snubber circuit suitable for inverter bridge leg modules.
本文采用双逆变技术研制了一种新型的焊接磁搅拌装置。
A new welding electromagnetic stirring device was developed with the dual inverter technique in this paper.
本文对四段全控桥电路在整流、逆变工况的微机实时控制进行了理论阐述和物理模拟试验。
This paper concerns the microcomputer-based real-time control of four-step controlled bridge which works both in the mode of rectifier and inverter.
采用先进的逆变技术，工作频率高，体积小，重量轻，便于携带。
The use of inverter technology, high frequency, small size, light weight, easy to carry.
介绍了该逆变式弧焊机的构成，工作原理及特点。
The paper introduces the configuration, principle and characteristics of the inverter for arc welder.
本文为熔化极CO2保护的IGBT逆变半自动弧焊机电源研制了一套控制系统。
In this thesis, a set of control system is developed for IGBT inverter power supply of consumable-electrode CO2 shielded arc-welding machine.
该焊机由于采用了中频逆变技术，使其效率和功率因数都有较大幅度的提高，不但减小了体积，减轻了重量，而且具有比传统TIG焊机更精密的控制、调节性能等。
Compared with the conventional TIG welding machine, this new inverter proves to have much higher efficiency and power factor, less volume and weight, and especially, more precise parameter control.
本论文主要介绍了所研制的单片机控制逆变埋弧焊机的组成结构和控制原理。
The component parts and control principle of pulsed SAW inverter power source are mainly introduced in the paper.
结果表明：这种新型的大功率埋弧逆变自动焊机有着广阔的应用前景。
The result shows that this newfashioned high-power machine of submerged-arc welding inverter has wide prospect of application.
本文主要介绍逆变电源的分析和该ups逆变系统的硬件设计和软件设计，主控制芯片采用TMS320F240。
This dissertation chiefly introduces the analysis of this inverter power and the design of hardware and software of this UPS, and the core control chip is TMS320F240 which is produced by ti corp.
本文研制逆变点焊电源的微机恒流控制系统。
This paper deals with the development of the microcomputer constant current control system of the spot welding inverter.
研究了变分学中的逆问题。
采用数字化逆变器来实现电力系统正弦电压信号功率的放大，利用DSP的高速处理能力，实现了逆变系统的高性能和高精度。
This digital amplifier consists of a digital inverter that can amplify the sine voltage signal power using a digital signal processor (DSP).
针对以上问题，提出了一种引入高阶正则项约束的逆扩散变分图像增强模型。
In this paper, these shortcomings of inverse diffusion model were considered and the variational model of image enhancement coupling high order regularization term was proposed.
本文提出了逆变式弧焊电源高频变压器的设计步骤、方法以及实例。
The design procedures and examples of high frequency transformer Used in Inverter ArcWelding Power Source are proposed in this paper.
而分布式发电技术需要功率因数高，谐波污染少的大功率整流逆变系统作为其能量转换装置。
But this useful technology needs high power factor, low harmonics pollution rectifiers and inverters to be its energy converters.
介绍了大功率单相变频加热电源的系统组成，包括整流、滤波、逆变和控制电路等部分。
This paper introduces the system of single phase large power source varied frequency for heating, contains rectifier, filter, inverter and control circuit etc.
控制电路是逆变弧焊机的技术关键之一。
The control circuit is one of technology keys of arc welding inverter.
提出了一种由斩波电路与全桥逆变电路构成的电压型大功率晶闸管全桥逆变主电路。
A voltage type high power invert circuit which is composed of chopper and thyristor full bridge invertor is proposed.
本文简要介绍了现代逆变技术的概念、分类及现代逆变系统基本结构。然后详细描述了车载电网中逆变器的功能实现和参数设计。
The concept, classification and system structure of modern inverter are reviewed briefly, and the function realization and design parameters of the inverter on vehicle power are described in detail.
本文在对光伏并网逆变装置进行理论分析的基础上，研制开发了一套基于C8051F040单片机的并网逆变装置样机。
Based on making theoretic analysis of grid- connected photovoltaic inverter, a set of grid-connected photovoltaic sample inverter is developed based on singlechip of C8051F040.
针对不间断电源(ups)逆变控制技术数字化的趋势，论述了当前UPS逆变控制中存在的各种数字化智能控制技术。
Based on the digitization trend of UPS inverter control technique, several kinds of digitization intelligent technique used for UPS inverter were discussed.
CIT系列逆变充电器是采用先进的逆变技术开发的新产品。
CIT inverter charger is the new-developed product with the advanced inverter tech.
该方法基于微分几何理论，并将直流输电系统等效为两个分别连接在整流侧和逆变侧的变导纳支路。
The approach proposed in this paper is based on differential geometric theory, and the HVDC systems are taken as a variable admittance connected at the inverter or rectifier ac bus.
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