<正> We have calculated the electron energy of the ground and lower excited states for H_2~+-like impurity statesconfined in finite spherical quantum dots in Ga
<正> The ground state of the one-dimensional hard-core boson Hubbard model with a superlattice potential isstudied by quantum Monte Carlo methods.We demonstrate
<正> Through using the methods of finite-size effect and short time dynamic scaling,we study the criticalbehavior of parasitic disease spreading process in a di