MV级近方波Marx发生器的设计

分析了Marx发生器与正弦振荡回路组合直接输出方波脉冲的近方波Marx发生器理论，并设计了一个该类型的方波发生器装置。其中,Marx发生器由16个充电电压为100 kV、容值为40 nF的电容器组成，采用正负充电的S型超前触发回路,正弦振荡回路由5个与Marx发生器同类型的电容器和1个0.5 H的电感组成。通过Spice模拟，在负载为100 时，输出脉冲电压为1.1 MV，脉宽约300 ns。提出了利用Marx发生器触发LC回路的方法，以解决Marx与LC回路的同步触发问题，使输出电压能够有效叠加。

Effect of low-dose electromagnetic radiation on peripheral blood cells in mouse

Male Babl/c mouses were exposed to 0.625 mW/cm2 and 1.25 mW/cm2 2856 MHz microwaves for 30 min×2 times. Venous blood samples were collected at 1 h,1 d,3 d，7 d,15 d and 30 d after exposure and differential counting of blood cells were performed． Immediate increases in white blood cell count and percentage, neutrophilic granulocyte count and percentage were observed after exposure to 0.625 mW/cm2 and 1.25 mW/cm2 microwave irradiations. On days 3，7 and 15，they elevated more significantly than contro1 group （p≤0.01）．Lymphocyte count and percentage decreased after exposure to both irradiations. On days 3，7 and 15， they reduced more significantly than contro1 grop （p≤0.01）. Both 0.625 mW/cm2 and 1.25 mW/cm2 dose exposures have little effect on， platelets and erythrocytes. Low dos