<正>Nano-silver/polyvinylpyrrolidone(PVP)composite materials were successfully synthesized bi-insitu from silver nitrate solution with N-vinyl pyrrolidone (NVP)
<正> In order to evaluate the safety production situation of the coal mine effectively,selected the indicators about mine production safety, applied entropy met
<正> Based on simulated material scale modeling and numerical simulation, the protective seam mining method was conducted at one coal mine. After extracting the
<正>A new type of high-frequency micro-pump was designed, in which GMA (Giant Magnetostrictive Actuator) was employed to replace the traditional motor drive, ow