工频

The automatic identification of vibration, the composition of control forces with different frequencies, the controlalgorithm and process are studied. 4. The nonlinear property of active magnetic actuator , the major part of rotor vibration control system, is investigated.

针对旋转机械一些故障引起的多频振动问题，以及目前各种平衡头只能控制工频振动，对其它频率成份的振动无能为力的这一情况，提出用电磁执行器进行多频振动的前馈自学习控制方法。

Because the metal melt fluid washes outthe furnace lining unceasingly as the metallurgy smelting, the different furnace lining material, the furnace lining smelting life is dissimilar, so power frequency furnace is also same as any other type smelting when they are manufactured, not equiping with furnace lining material, the using factoryshould have the professional furnace lining technical personnel and furnaceman.

由于冶金熔炼时，金属熔液不断冲刷炉衬，不同的炉衬材料，炉衬熔炼寿命也不一样，不同的金属所适应的炉衬材料也不一样，所以工频炉出厂也同任何种类熔炼出厂一样，不配备炉衬材料，使用厂应备有专职的炉衬技术人员和筑炉工。

Because time metallurgy smelting, the metal melt fluid washes out the furnace lining unceasingly, the different furnace lining material, the furnace lining smelting life is dissimilar, the different metal adapts the furnace lining material is dissimilar, therefore power frequency stove leaving the plant is also same as any type smelting leaving the plant, does not provide the furnace lining material, the use factory should have the professional furnace lining technical personnel and build the furnaceman.

由于冶金熔炼时，金属熔液不断冲刷炉衬，不同的炉衬材料，炉衬熔炼寿命也不一样，不同的金属所适应的炉衬材料也不一样，所以工频炉出厂也同任何种类熔炼出厂一样，不配备炉衬材料，使用厂应备有专职的炉衬技术人员和筑炉工。

Because time metallurgy smelting, the metal melt fluid washes out the furnace lining unceasingly, the different furnace lining material, the furnace liningsmelting life is dissimilar, the different metal adapts the furnace lining material is dissimilar, therefore power frequency stove leaving the plant is also same as any type smelting leaving the plant, does not provide the furnace lining material, the use factory should have the professional furnace liningtechnical personnel and build the furnaceman.

由于冶金熔炼时，金属熔液不断冲刷炉衬，不同的炉衬材料，炉衬熔炼寿命也不一样，不同的金属所适应的炉衬材料也不一样，所以工频炉出厂也同任何种类熔炼出厂一样，不配备炉衬材料，使用厂应备有专职的炉衬技术人员和筑炉工。

Part One Research on Measuring of Resistive Current Passing Through XLPE Cable With Applying AC Voltage: By many tests,It is found that mains frequency is not sensitive to the mechanical fault of power cable main insulation.Accordingly,a new method that the fault of power cable main insulation is measured by measuring the resistance component of leakage current is put forward.

第一部分对XLPE 电力电缆施加工频交流电压时阻性电流的检测研究：通过大量的试验发现工频交流耐压试验对电力电缆主绝缘的机械损伤不灵敏，从而提出了通过检测泄漏电流的阻性分量来检测电力电缆主绝缘缺陷的新方法。

A double-T frame trap filter which contains a positive feedback is designed percolate syntonic of power frequency.Base on Butterworth function a high-pass and a low-pass filter...

通过Mu ltisim软件对所设计的陷波电路和滤波电路进行频响特性仿真，得到的频响特性曲线表明：所设计电路可成功滤掉工频干扰和母体噪音干扰。

The responses properties of coupled vibrations for 120° and 180°asynchronous juxtaposition of 200MW turbine-generator set were analyzed. The results show that the responses properties of flexural and torsional vibrations caused by 120° asynchronous juxtaposition are similar to that of 180° asynchronous juxtaposition. When the fault happened, Former two steps inherence frequencies and whirl speed frequency of torsion are excited. And the first step inherence frequencies of flexural vibration are also excited besides whirl speed frequency. Transient electromagnetism moment peak, torsional and torsional moment responses caused by 180° asynchronous juxtaposition are lower than that of 120° asynchronous juxtaposition.

利用该方法，针对某200MW汽轮发电机组的120°和180°两种非同期并列情况，进行了机组弯扭耦合振动响应特性研究，分析表明：汽轮发电机组的120°和180°两种非同期并列情况下的弯振和扭振响应特性基本相似；非同期并列主要激发出工频和前两阶固有频率扭振，弯振除工频主分量外，第一阶固有频率也被激发出来；180°非同期并列时的暂态电磁力矩峰值比120°非同期并列时低，相应的扭振和扭矩响应也小于后者。

Simulation results show that the greater the series compensation degree, the higher power frequency transient over voltage.

仿真结果表明：在各种工况下，随着串联补偿度的增加，工频电压升高幅值增加。

Flexible changeover: a changeover cabinet allows the customer to conduct changeovers easily at any time.

转换灵活：变频转换柜方便用户在任何时候，进行工频到变频或变频到工频的切换。

In the present study, CHL cells were cultured routinely in MEM medium for 3 days. Then the cells were treated with sham exposure , 0.4mT 50 Hz sinusoidal MF , 0.4mT noise MF and the combined noise and 50Hz MF for 3 min and 15min, respectively. After exposure, the cells were lysed, and the proteins were extracted.

实验中，将中国仓鼠肺成纤维细胞分别经0.4mT工频磁场、等强度的噪声磁场、工频磁场与噪声磁场的复合磁场辐照及假辐照处理3min和15min后，裂解细胞，提取细胞蛋白质，以Western印迹技术，测定并比较细胞内SAPK磷酸化的变化。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。