Multiple frequency APFT 1 Aliasing 1 Almost periodic 1 Almost periodic Fourier transform 1 Almost periodic fourier transform 1 Atmospheric temperature 1 Beijing [China] 1 Building densities 1 Building density 1 Buildings 1 China 1 Classifieds 1 Comb-like 1 Composite medium 1 Condition number 1 Condition numbers 1 Cooling factor 1 Cooling factors 1 Discrete Fourier transforms 1 Dispersion (waves) 1 Duffing oscillator 1 Duffing's oscillator 1 Effective permeability 1 Epsilon-near zeros 1 Floors 1 Fourier analysis 1 Harmonic Balance method 1 Harmonic analysis 1 Harmonic balance 1