A method is derived to solve the massless Dirac-Weyl equation describing electron transport in a monolayer of graphene with a scalar potential barrier U(x,t), homogeneous in the y direction, of arbitrary space and time dependence. Resonant enhancement of both electron backscattering and currents, across and along the barrier, is predicted when the modulation frequencies satisfy certain resonanc...

Firstly we shall introduce the development situation of China’s textile industry from international trade perspective, and then analyze the current international trade competition focusing on international trade barriers which consist of tariff and non-tariff barriers respectively. Finally we propose that increasing non-tariff barriers to China’s textile exportation are due to lower tariff, tra...