How can I Implementing a internal heat generation function that is a function of position and temperature using the PDEtool?

Greetings,

I'm trying to simulate the steady state of a resing curing process but I'm having problems to implement the function that governs the internal heat generation. I would like to know if someone would help me to fix my code. I have been looking around for some information on this topic but i did not find any information about this expecific topic.