In the plasma sheath a narrow plasma channel generated by ultraintense laser pulses is simplified as a special cylindrical and hollow plasma waveguide with the
【正】 The profit-earning level of the titanium di-oxide sector in China dropped to a histori-cal low in the first quarter of 2008 due to factors such as a dras
【正】 In line with its voluntary product stewardship approach,Arkema has developed a new process that eliminates fluorosurfactants from its PVDF(polyvinylidene