in here i did exactly the same but i am not sure the author did something mistake or i did becuase one term in the pde is change and how exactly do that replacement in eq62?

S.mw

i did try and even replace the function w(t) by anotehr thing but is not working  how i can find that and make be answer of my pde?

k1.mw

How can find thus parameters 

Dr.D-problem.mw

a million time i try to figure out how i can get this plot ? why my graph  in countor is not same the 3D plot? where is problem?

Bgraph1.mw

i am waiting  about 5-10 min to get result but if my equation not satisfy the solutions i have to  remove this model and find another one so  how i can handle this?

p-test.mw