When the vibration source frequency approaches to the natural frequency of belt weigher, the belt weigher will bring resonance.

当振动源频率和皮带秤固有频率接近时，皮带秤将发生共振。

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The applications and the results of Electric doublet source frequency sounding on the Northern margin of Longshou mountain of Gansu are introduced.

讨论电偶源频率测深法在甘肃省龙首山北缘地区的应用及效果。

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The principle of main parameter of the with the change of source frequency were given on the base of analyzing the equivalent circuit of induction motor.

在感应电动机等效电路的基础上，分析了当电源频率发生改变时，等值电路中主要参数的变化规律。

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Dr Ardavan is confident that, if the machine can be coaxed into doing this, it will radiate in exactly the way he predicts, providing a tuneable and compact source of high-frequency microwaves in effect, a tabletop pulsar, without the neutron star.

ECONOMIST: Physics

The engineers found a way to kick-start a radio-frequency device wirelessly using an external power source initially, but running the device afterward on the output of power generated by the inner ear.

WSJ: Harnessing Energy From the Body to Power Devices

"These are spectacular numbers, better than the GDP and employment reports suggested, and confirm that the labour market is not at the moment the source of anything that could be plausibly described as inflationary pressure, " said Ian Shepherdson of High Frequency Economics.

BBC: US productivity grows 5%