X iv :c on dm at /0 50 93 75 v1 [ co nd -m at .m es -h al l] 1 4 Se p 20 05 Effect of temperature on the binding energy of a shallow hydrogenic impurity in a Quantum Well Wire T G Emam Department of Mathematics, Faculty of science, Ain Shams university, Abbassia, Cairo, Egypt. and Department of Mathematics, the German university in Cairo-GUC, New Cairo city, Main Entrance Al Tagamoa Al Khames, ...