derivative function for pure components
function der_temperature_hxi extends TILMedia.BaseClasses.PartialLiquidFunction; input SI.SpecificEnthalpy h "Specific enthalpy"; input SI.MassFraction[:] xi "Mass fractions of the first nc-1 components"; input TILMedia.Internals.TILMediaExternalObject liquidPointer; input Real der_h "Specific enthalpy"; input Real[:] der_xi "Mass fractions of the first nc-1 components"; output Real der_T "Temperature"; end der_temperature_hxi;