查询词典 contravariant

Because contravariant redefinition of method is not consistent with traditional programming style, covariant redefinition of method is preferred to as the mechanism to support specialization.

反变的方法重定义不符合思维习惯，一般采用协变精化的设计方法。

The paper briefly explains the contravariant principle and the effect of the return of afterflow,suggests the method of rendering the return of afterflow.

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 pressure oscillation which can t be tested by continuity equation is prevented by means of a special averaging procedure of contravariant velocity components on control volume faces.

提出了在贴体坐标系中非交错网格的SIMPLE 算法，通过对控制界面上的逆变速度分量作特殊加权平均处理，可避免在非交错网格中产生压力波动而连续性方程又无法检测出来的问题

This article introduces a new contravariant bridge circuit in the power source of the medium friquency induction furnace,analyzes the necessity of using R-C for protecting the thyris-tors.

介绍一种新型晶闸管中频感应电炉的逆变电桥，分析了对该电桥逆变晶闸管采用阻容保护电路的必要性。

The fluorescent lamp ballast circuit used MSC60028 with higher power factor is developed,and the system consists of control circuit,boost circuit and contravariant circuit.

开发了一种采用MS C60028 集成功率因数校正芯片构成的高功率因数日光灯镇流器，整个系统由控制电路、升压电路、逆变电路三部分组成。

Along with the electrical machinery control special-purpose DSP appearance and the control theory universal development, caused the contravariant power source the control technology to face the entire digitized, the intellectualized direction is developing, inverts the power source numerical control technology to have a big leap.

随着电机控制专用DSP的出现和控制理论的普遍发展，使得逆变电源的控制技术朝着全数字化、智能化的方向发展，逆变电源的数字控制技术发生了一次大的飞跃。

The presentpaper proposed one kind of numerical control single-phase inversionstructure, in detail elaborated the system parameter design, therectification work basic principle of work, the contravariant basicprinciple and the SPWM sine pulse width modulation.

本论文提出了一种数字控制的单相逆变器结构，详细论述了系统的参数设计，整流工作的基本工作原理，逆变的基本原理及SPWM正弦脉冲宽度调制。

It when the contravariant power source works the continually output is 100W, may realize the power source to invert, functions and so on voltage regulation, undervoltage protection and overflow protection.

其在逆变电源工作时的持续输出功率为100W，可实现电源逆变、电压稳定、欠压保护及过流保护等功能。要准确的，不要在线翻译了给我，谢谢了

Then analyzed has compared the contravariant controller control strategy, in established in the SPWM inversion linearization model foundation to analyze the necessity which double-circle controlled, and in controlled in the link to introduce the PID adjustment, enhanced the control the dynamic response ability and the system stability, enhanced the power source the load compatibility and the output stability.

接着分析比较了逆变控制器的控制策略，在建立了SPWM逆变器的线性化模型基础上分析了双环控制的必要性，并在控制环节中引入PID调节，来提高控制的动态响应能力和系统的稳定性，以提高逆变电源的负载适应性和输出的稳定性。

Onlyadjusting outside resistance and the capacitance value, not only it may obtain the contravariant frequency which we need, moreover it may adjust the dead time, like this wemay realize to adjust the pulse width neatly.

调节外接电阻和电容值，不但可以获得所需的逆变频率，而且可以调节死区时间，这样可以实现对脉宽、周期的灵活调节。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。