Nonlinear Diffusion:
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​​   Fick's Second Law
​​     ​
​   Higuchi Principles

   Impedance Spectroscopy​​

    

Silicone Implant Drug Release in Time
​(​Example only. Patents on real devices have not yet published.)
Novel Moving Polynomial Derivative Technique applied to real and imaginary voltage responses yields "signatures" for identifying drugs and concentrations in real-time 
​electrochemical impedance spectroscopy.