Need help for heat conduction problem with multiple BC

bancux
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Dear all, I have difficulty in solving this problem (see the figure in attached thumbnails)

I have a rectangular shape with length/height of L and the thickness/width of \delta
Within the rectangular area, a heat conduction occurred. I would like to determine the temperature profile within the rectangular.

Based on the right hand side figure, I take a small cell with size of dx times dy. Applying the energy balance within the cell.

I have attached all the equation that I can think of, and also the boundary conditions. I have difficulty in solving the differential equation.

Thanks in advance.

note:

\lambda is thermal conductivity
\alpha is heat transfer coefficient, it is suppose to be dependent on x-location and time. I am going to simulate the heat transfer coefficient as a periodic function.
 

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Still no answer...
Hmmm...

:confused:
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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