摘要用氧气体积分数法划分低瓦斯采空区自燃“三带”是目前在工程实践中应用最为广泛，也是最有效的方法。
Abstract: the oxygen concentration method is the most effective and most commonly used method in dividing spontaneous combustion "three zone" in low-gas goaf in engineering practice at present.
测试表明，甲醇体积分数10％-15％的甲醇汽油各项性能与一般车用无铅汽油相当，可使汽油研究法辛烷值提高1．5-3．5个单位；
Most of the performances of methanol gasoline of 10%-15% ( volume fraction) methanol are nearly the same as those of unleaded motor gasoline and the RON is 1.5-3.5 higher.
基于小角X射线散射理论，利用逐级切线法和材料分形理论中的散射强度法，分别计算PAN基炭纤维内微孔大小、体积分数及微孔表面分形维数。
Based on SAXS theory and fractal theory, we obtain the calculating method and calculating formulas of the pore size, pore volume percentage and the fractal of pore surface in PAN - based carbon fiber.
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