Adaptive energy-preserving algorithms for guiding center system

We develop two types of adaptive energy preserving algorithms based on the averaged vector field for the guiding center dynamics, which plays a key role in magnetized plasmas. The adaptive scheme is applied to the Gauss Legendre’s quadrature rules and time stepsize respectively to overcome the energy drift problem in traditional energy-preserving algorithms.These new adaptive algorithms are second order, and their algebraic order is carefully studied.Numerical results show that the global energy...     

不同粒度锌粉除钴效果的探究及生产实践

对不同粒度锌粉除钴的程度及除钴的速度进行试验探究。结果表明:锑钴比0. 06,锌粉粒度控制在48～75μm,活性锌2 g/L,反应2 h,可将Co从13. 69 mg/L降至0. 3 mg/L,并运用于生产实践,取得较好经济效益。