直流的

The aim of this research is to use DC link parallel resonance three---phase soft---switching technique to realize in inverter.

本研究课题的目标是三相软开关变频器DC直流环节的并联谐振，实现逆变桥上每个功率开关器件以零电压方式开通，达到软开关的目的。

The aim of this research is to useDC link parallel resonance three---phase soft---switching techniqueto realize in inverter.

本研究课题的目标是三相软开关变频器DC直流环节的并联谐振，实现逆变桥上每个功率开关器件以零电压方式开通，达到软开关的目的。

This is not really a disadvantage, but a difference in the way the two types of voltage are measured, AC is measured in RMS while Dc is measured as Peak Voltage.

这不是一个真正的缺点﹐而是两者的计量方式不同，交流电压是以有效值来计量而直流电压是以其峰值来计量的。

Triggered by a laser pulse with an incident optical energy of 9.9 mJ and a wavelength of 1 064 nm,photoconductivity tests of the PCSS were performed at different bias voltages.

在不同的直流偏置电压下，使用波长为1 064 nm、能量为9.9 mJ的激光脉冲触发使开关导通，开关置于0.2 MPa的SF6气体环境中。

This paper presents the methods of testing and analysis and preventability of several typical faults ,and the importance of primary resistance measurement,chromatogram analysis and dielectric loss test in overheat,damping and department charge of capacitive current transformer.

提出了对这几种典型故障进行试验、分析、预防及解决的方法，以及一次直流电阻测试、色谱分析、介损测试在电容型电流互感器的过热、受潮、局部放电等故障分析中的重要性。

The compensation current is then directly related to the primary current by the turns ratio of the primary winding to the compensation winding.

此方法的优点是不必使检测磁芯驱动至饱和（实际上不到600GS），对被测电路的干扰小，可以测量高精度的直流电流，并与被测电路隔离。

For example, building direct current sequential logic circuits out of relays requires additional hardware to cope with the problem of contact bounce.

例如，建设直流时序逻辑电路的继电器，需要额外的硬件，以应付的问题，联系反弹。

This method is pure software,and the code synchronization,demodulation,frame synchronization and data processing are implemented by the MCU program on one chip.

其优点是存在很强的定时分量，容易提取定时信息；同时不存在直流分量，对于大多数采用交流耦合的有线信道来说是很有利的。

Calculation and analysis are made on the variable pressure operation capabilities of the water wall system, superheater and reheater systems of the 300MW once-through boilers of Chinese design and evaluations of the fatigue life of major components are given based on the results of the analysis.

本文以计算分析为手段，对国产30万千瓦直流锅炉的水冷壁系统、过热器及再热器系统的变压运行能力进行了分析，并对主要部件的疲劳寿命作出评价。

MSP430F169 microcontroller was the core components of control and measurement function of an electromagnetic relay characteristic parameter tester. The tester also included DC power module, power amplifier module, constant current source module, keys, and digital tube display module. The tester could test the data of 943-1C-12DS electromagnetic relays including the minimum pull-in voltage, maximum release voltage, relay coil voltage rating when the pull-contact time, release time as well as the contact value of the contact resistance. The system could complete automatic measurement parameters to achieve all the basic requirements of design. And all of the test data was displayed through the 74HC573 digital tube.

摘 要：以MSP430F169单片机作为控制和测量的核心部件，辅以直流稳压电源模块、功率放大电路模块、恒流源模块、按键和数码管显示模块等组成一个电磁式继电器特性参数测试仪，完成对943-1C-12DS电磁式继电器最小吸合电压、最大释放电压、继电器线圈电压为额定值时的触点吸合时间、释放时间以及触点接触电阻值的测试，该系统能够实现成套参数自动测量，所有测试数据通过74HC573数码管进行显示。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。