Land use change is a very complex process of evolution. On the basis of the principle of cellular automata, this article presents a kind of method that we can first mine state transition rule from historical map data, and then conduct forecast by virtue of Monte-Carlo method, achieving spatial...

The opal photonic crystals made of polystyrene microspheres with 155, 230, 270 or 410 nm in diameter were used to enhance upconversion (UC) emission of YF3:Yb3+, Er3+ nanoparticles, respectively. The red or green UC emission of YF3:Yb3+, Er3+ nanoparticles can be selectively enhanced when the...

We investigate the use of unit (i.e., package) initial public offerings by Australian industrial firms and conclude that their use reflects their role as a signaling mechanism (Chemmanur and Fulghieri, 1997), as distinct from the agency?cost explanation offered by Schultz (1993). From a sample...