In recent years, soil erosion caused by water has gradually increased due to the increase of extreme precipitation. order reduce precipitation, it is necessary monitor and found out factors that affect under The objective this study was assess amount erosion, damage degree conservation measures benefit evaluation precipitation in Henan Province. results indicated ridges terraces two small water...

We investigate the equilibration of a fivefold surface of the icosahedral Al‐Pd‐Mn quasicrystal at 900–915 and 925–950 K, using scanning tunneling microscopy. After annealing at the lower temperatures, there is a high density of shallow voids on some terraces but not on others; at 925–950 K, the void-rich terraces are much rarer. The terminations that are consumed by voids exhibit a distinctive...

We consider the Stefan problem of nonlinear diffusion equation $ u_t = \Delta u+f(u) for t>0 and x\in\Omega(t)(\subset\mathbb{R}^N) with positive bistable nonlinearity f $. first prove that any initial data, long-time behavior solution is classified into four cases: vanishing, small spreading, big spreading transition. In particular, we show when transition occurs u $, there exists an x_0\in...