直流的

This device use the principle of additional DC power supply in main feeding switch, and use the principle of direction of zero sequence power in branch feeding switch.

该装置在总馈电开关处的漏电保护装置使用附加直流电源原理，在分支馈电开关处的漏电保护装置使用零序功率方向式保护原理。

The self-heating effect in power GaAs MESFETs is significant, but it is seldom discussed in detail in other models.

此外，各个电荷源的总电荷量为零，确保了模型在直流条件与射频条件下的一致性。

Based on the DC model and the self-heating model of SiC MESFETs, the self-heating effect is investigated in detail.

针对4H-SiC射频MESFET中的自热效应，建立了基于解析模型的材料参数温度模型和器件直流模型。

The control signals of the PWM rectifier are obtained by comparing the current of AC side with triangular wave (or saw-tooth wave) directly, which can implement the steadiness of the voltage of DC side and unit capacity factor of the system. At the same time, harmonic component of the system is abstracted through Instant Reactive Power Method, which can be smoothed by Integrated Learning Boost Converter Control.

本文采用重复学习Boost变换技术，利用滑模变结构控制技术对单相PWM整流器恒频Boost变换进行了分析，提出将交流侧电流直接与三角波相比较得到开关控制信号的方法，实现直流电压恒定不变及系统单位功率因数；同时，利用瞬时无功功率法分析系统谐波，并在谐波域内使用重复学习的控制方法，结合Boost变换技术，有效滤除系统谐波有功电流。

Among the four relations of study for system design standard, it is suggested the focus is the relations between 1500V DC contact rail and human safety.

在直流1500V接触轨系统的&四大环节&研究中，建议重点对系统设计标准及产品制造标准进行研究；在系统设计标准的&四大关系&研究中，建议重点对1500V接触轨与人身安全防护关系进行研究。

But the accurate calculation of AC line voltage distortion and DC voltage ripple is rather difficult.

为了提供高品质的电力，电源的交流电压波形畸变率和直流电压纹波倍受关注，但其精确计算比较困难。

DEI has abundant technical manpower , fully performing iso9000:2000 quality ensure system , fully adopting the advanced producing techning technique and automatic inspecting system, in using of perfect inspecting methods, the quality of product is constant reliable .the major products of your compan include sub miniature dc motor,induction motor,universal,shaded pole motor and brushless motor at present,our products are widely uses for family electrical appliances:air condition,washing machine breadmachine,electrical fan, electrical tool,body health appliance and medical treatment appliance etc.our product exports to america,north korea,canada,japan etc.

公司技术力量雄厚，全面执行ISO9000：2000质量保证体系，全面采用先进的生产工艺及自动检测系统，具备完美的检测手段，质量稳定可靠。主要生产微型直流电机、交流电机、感应电机、罩极电机、无刷电机，目前产品广泛用于家用电器产品：空调、洗衣机、面包机、电风扇、电动工具及健身器材、医疗器械等，出口美国、韩国、加拿大、日本等国家。

In addition, Panasonic is also announcing the LUMIX G VARIO 45-200mm/F4.0-5.6/MEGA OIS lens and a wide-variety of accessories, including External Flash DMW-FL220(GN22); PL Filter: DMW-LPL52; Mount Adapter: DMW-MA1; Battery Pack: DMW-BLB13; DC Cable: DMW-DCC3; Soft Case: DMW-CG1; Soft Bag: DMW-BAG1; Shoulder Strap DMW-SSTG1-A/C/R; Shoulder Strap DMW-SSTG2-W; Shoulder Strap DMW-SSTG3-T.

此外，松下还推出了Lumix相机摹卡尔45-200mm/F4.0-5.6/MEGA光学防抖镜头，包括外部闪光地区小型- FL220（GN22）广泛的各种配件； PL滤镜：小型工程- LPL52；山适配器：小型工程- MA1，电池组：小型工程，BLB13，直流电源线：小型工程，DCC3，软袋：小型工程，化监，软袋：小型工程，BAG1；肩带DMW-SSTG1-A/C/R；肩带小型工程，SSTG2 -瓦；肩带地区小型- SSTG3 - T的。

Although the frequency of geomagnetically induced current caused by geomagnetic storm is very low but not equal to zero, the evaluation error is consequential when DC equivalent model of power network is adopted to evaluate GIC level.

由地磁暴引起的电网地磁感应电流(geomagnetically induced current，GIC)的频率很低，但并不为0，所以采用电网直流等效模型进行GIC水平评估时必然会产生误差。

The magnetic domain structure variation was analyzed using water-based magnetic fluid.

利用倒扭摆内耗仪研究了外加直流磁场对Fe-16Cr-2.5Mo合金阻尼性能的影响，采用水基磁流体观察分析了磁畴结构的变化。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。