The results show that hydrodynamic dispersion and indigenous biodegradation under mixed electron accepter conditions are primary mechanisms for the attenuation of ethanol and BTEX in porous media.

试验结果表明：水动力弥散和混合电子受体条件下的土著微生物降解是乙醇和单环芳香烃(BTEX)自然衰减的主要过程。

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The 'hot' dispersion equation of the coaxial ridge-disk-loaded cylindrical waveguide TWT with an annular electron beam can be firstly obtained according to self-consistent field theory.

引入薄环形电子注，首次建立了脊加载同轴膜片圆波导的注波互作用线性理论，得到小信号条件下的色散方程。

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The surface topography and composition of normal coating and spot were investigated by scanning electron microscope and energy dispersion spectrum.

采用扫描电镜结合能谱的测试方法，对热处理前后含铬绝缘涂层中正常涂层和斑点的表面形貌及成分进行了分析。

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