Solidification of solid-liquid interface of simple metals (Ni and Al) is investigated with molecular dynamics simulation. Two metals show a common feature that growth rate approach to a maximum at a critical temperature (T^*). Above T^*, growth behaviors are similar as reflected by monotonically increased growth rate with increasing undercooling temperature. However, below T^*, grow rate is nearly constant for Ni, while it rapidly decreases to zero for Al with increasing undercooling temperature. High-temperature Broughton-Gilmer-Jackson(BGJ) model and low-temperature Wilson-Frenkel (W-F) model are used to describe growth mechanism. At small undercooling and deep undercooling temperature zone, solid-liquid interface is formed by gradual change between collision and diffusion mechanism, and the dominated one varies in different temperature ranges.

An inverse blackbody radiation problem is discreted to a linear ill-posed system.A wavelet transform method is proposed for solution of the problem.With a combination of wavelet transformation and regularization method we convert the ill-posed problem into a posed problem in coarse space,which takes full advantage of compact support of wavelet.Numerical results show feasibility and robust reconstruction of the method.