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Solving Bloch equation for MRI

I am trying to write a numerical solver for Bloch equation to track the magnetisation of a spin during the excitation and relaxation processes. The general Bloch equations can be written as: $$ ...
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Frequency and water [closed]

How can frequency affect the state of water and what makes a water speaker blast so much water. Is there a small machine within the speaker that causes so much acceleration of water??? As an ...