An international organization would be in control of all nuclear products
Russia rejected this plan and triggered the nuclear arms race
#til2022 Peace Symbol
Created with the combination of the semaphore letters of N and D, which stands for "nuclear disarmament"
First developed to detect underground nuclear tests with seismometers
Now it is used in most compression algorithms and signal processing
Fourier Transform decomposes any signal into the sum product of sine waves
This is done by taking a sine (and cosine) wave and multiplying it into the signal and if the area under the product is non-zero then the sine wave is correlated with the signal and a component
The size of the area is the relative amplitude of that sine wive
Sweep across all frequencies of the sine (and cosine) wave
Discrete Fourier Transform is used for discrete finite data which is what the seismometers record
Requires a high number of calculations that scales with the number of samples N2
Fast Fourier Transform
Discovered by Tukey and implemented by Cooley
Scales with the number of samples Nlog2​N
However, this wasn't discovered in time so lots of underground testing were done during the arms race because the comprehensive test ban could not be established
But it was, Gauss figured out Fourier Transform and FFT before Fourier and Tukey but it wasn't published nor it was written in an easily accessible writing