The Fourier amplitude spectrum used in a seismological model can be expressed as a product of source spectrum, propagation path factor and site effect in frequency domain.

在频域内，场地的地震动傅立叶幅值谱，可以表示为震源谱、传播路径影响因子和场地效应的乘积。

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Another factor lubricating the path to physician employment is generational: Doctors now in training appear willing to forsake income for a better quality of life and are less interested in the entrepreneurship required to run a private practice.

WSJ: David Leffell: The Doctor's Office as Union Shop

When businesses are planning to invest, a key factor is the expected path of macroeconomic variables like inflation and real income growth.

FORBES: Federal Reserve Takes Another Step Toward Rule-Based Monetary Policy