This paper derived the formulation for the real efficient emission coefficient of secondary electron under the condition that high energyprimary electron incident on metal obliquely.
推导出高能原电子斜入射时的金属的有效真二次电子发射系数的表达式,它与入射角的余弦近似成反比。
2
For example, the United Arab Emirates has endorsed an ambitious target to draw 24% of its primaryenergy consumption from renewable sources by 2021.
例如,阿联酋已经批准了一个雄心勃勃的目标,即到2021年实现24%的主要能源消耗提取自可再生能源。
3
Renewables account for only a small share of global primaryenergy consumption, which is still dominated by fossil fuels—30% each for coal and oil, 25% for natural gas.