查询词典 contravariant

And the main circuit chart used microsoft office visio to draw up, has realized the filter circuit, the leveling circuit, the contravariant electric circuit's composition design.

其中主电路图使用了microsoft office visio来绘制，实现了滤波电路、整流电路、逆变电路的组成设计。关键字：单片机 V/F控制 HEF4752

We use integrated chip TL494 are the master control chips, by the MOSFET tube constitution inversion electric circuit, has realized the contravariant system's pulse-duration modulation.

我们采用集成芯片TL494为主控芯片，以MOSFET管构成逆变电路，实现了逆变系统的脉宽调制。

The 300W single item incorporation feed inversion electric circuit's design is mainly transforms the small electro-optical source battery through the contravariant electric circuit as the stable room electric output.

300W单项并网馈电逆变电路的设计主要是将小型的光电源电池通过逆变电路转化为稳定的室电输出。

Our company's main products include: automatic submerged arc welder, CO2 shield welder, argon arc welder, manual arc welder, resistance welder, plasma cutter, contravariant welder and vacuum power source and crude oil heating power source, etc.

公司主要产品有：自动埋弧焊机、 CO2气体保护焊机、氩弧焊机、手弧焊机、电阻焊机、等离子切割机、逆变焊机及真空电源和原油加热电源等。

This design separately uses series linear constant voltage circuit, series regulate constant current circuit and the feedback type contravariant circuit to design direct current constant voltage power supply, direct current constant current power supply and DC-DC converter.

本设计分别用串联型线性稳压电路，串联调整式稳流电路和反馈式逆变电路设计直流稳压电源，直流稳流电源和DC-DC变换器。

The grids can be densified locally where the flow is complicated for the sharp change of water depth.(5) 2-D hydrodynamic equations in the generalized curvilinear coordinates have been derived with the contravariant velocities as main variables. The new equations keep the original styles and physical meanings. Based on the water depth correction method, the 2-D flow numerical model has been established and validated by the measured data.

推导了广义曲线坐标系下以逆变流速张量作为主变量的二维水动力方程，新方程保持原有结构形式及物理含义，采用水位校正法建立了二维水流数学模型，经实测资料验证后的模型，模拟并分析了分流角度、宽深比等因素变化对分汊流平面二维水流结构的影响。

The main circuit adopts the threephase bipolarity contravariant bridge circuit composed of power bipolar-transistor.

其逆变器依据正弦波脉宽调制技术，主电路采用三相双极性逆变桥式电路，逆变管采用电力场效应晶体管。

That the net type solar energy vanquishes system only is from solar energy module and , cover the contravariant implement as with a net and protect the electric power generation system that the device is composed of and , the solar energy sends in the common electrified wire netting , an electrified wire netting is regarded as directly after changing into electric energy to store up electrical installation .

并网型太阳能光伏系统是由太阳能组件，并网逆变器与保护装置组成的发电系统，太阳能转化为电能后直接送入公共电网，把电网当作蓄电设备。

Evaporating fan Automobile air-conditioner Asynchronous motor Contravariant device SPWM

蒸发风机；汽车空调；三相异步电动机；逆变器；正弦波脉宽调制

Vector analysis, Dyads, index notation, covariant and contravariant derivatives, Christoffel symbols, Riemann tensor, hydro-dynamical field equation.

张量及场方程式：三维向量，张量符号，张量微分，克里斯多夫符号，黎曼张量，流体动力场方程式。

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。