Derivative of reaction index for formation of NO
function U6_der extends Modelica.Icons.Function; input Modelica.SIunits.AbsolutePressure p "Pressure"; input Modelica.SIunits.Temperature T "Temperature"; input Modelica.SIunits.MoleFraction[4] moleFraction "Mole fractions"; input Real p_der "Derivative of pressure"; input Real T_der "Derivative of temperature"; input Real[4] moleFraction_der "Derivative of mole fractions"; output Real u_der "Derivative of reaction index for NO"; end U6_der;