If metal shielding exceeds a centimeter , electromagnetic protection declines drastically , he explains , because impacts by energetic particles can cause strong electromagnetic bremsstrahlung radiation that can result in extensive damage . ( bremsstrahlung is german for the “ braking radiation ” produced when a charged particle decelerates rapidly as a result of collision with another body 他进一步解释，金属防护层厚度超过一公分时，电磁防护能力将大幅降低，因为受高能粒子撞击时，会形成强大的制动辐射，造成更大的损害（制动辐射是由于带电粒子碰撞其他物体而突然减速所造成） 。
In present study the calculation of the time slope term in the bgk scheme including the non - equilibrium state effect is simplified based on the conservation of mass , momentum and energy in particle collision . numerical tests show that the simplification not only keeps the advantages of the old one but also makes it simpler and more efficient 本文研究首先从引入非平衡态因素的bgk格式出发，基于粒子碰撞过程中质量、动量和能量守恒的原理，简化了原格式中时间梯度项的计算，有效地减少了计算量。
