air-mass frequency 气团频率
air mass frequency 气团频率
Radio- frequency mass spectrometer 射频质谱仪
linear radio-frequency mass-spectrometer 线性射频质谱仪 ; 直线高频质谱仪
radio frequency quadrupole mass spectrometer 射频四极矩质谱计
eighteen stage radio-frequency mass spectrometer 十八级射频质谱计
So if now I hang on it a mass of one kilogram, I can calculate the period of one oscillation, and one over the period F is the frequency F, and I believe that is something like 38 hertz.
如果在上面,悬挂1公斤物质,我能够计算出,振荡的周期,1除以周期,等于频率,我相信,等于大概38赫兹。
In this paper, a method for shifting the natural frequency of a structure to a desired value by modifying the local stiffness and mass parameters is proposed.
本文对修改结构局部刚度和质量参数,从而使其具有给定固有频率的动力修改问题提出了一种求解方法。
ResultsIn case of various axial loads and mass ratios, various curves between dimensionless fluid flow velocity and dimensionless complex frequency are plotted.
结果得出了不同轴向载荷和不同质量比下的无量纲流速与无量纲频率的关系曲线。
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