The Linkage of Data Describing Overlapping Geographical Units
The Linkage of Data Describing Overlapping Geographical Units
复制标题
描述重叠地理单元的数据的链接
DOI：
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发表时间：
1973
期刊：
影响因子：
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通讯作者：
G. Shapiro
中科院分区：
文献类型：
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作者：
J. Markoff;G. Shapiro
一种质量或能量过滤器或光谱仪，具有已知的电极结构，例如四极圆柱形、双极圆柱形或双曲面，其中电极由周期性或准周期性时变电势激励，该电势的波形明显不同于正弦曲线，并且在其傅立叶级数中包含零次谐波项。优选地，波形的特征应该是矩形或梯形，并且应该提供用于改变波形的占空比的装置。
A mass or energy filter or spectrometer having a known electrode configuration such as quadrupole cylindrical, monopole cylindrical or hyperboloidal wherein the electrodes are energised by a periodic or quasi-periodic time varying electrical potential the waveform of which is significantly different from a sinusoid and incorporates a zeroth harmonic term in its Fourier series. It is preferred that the waveform should be either rectangular in character or trapezoidal in character and that means should be provided for varying the duty cycle of the waveform.