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Based on the range–energy relationship, the characteristics of secondary electron emission, some relationship between the secondary electron yield δ and experimental results, the universal formulae for δ0.8−2 (the subscript indicates that the energy range of primary energy at the surface Wpo is from 0.8 keV to 2 keV) and δ2−10 for metals were deduced. The δ ...
A field investigation was conducted to understand the root distributions and elemental accumulations of Chinese brake (Pteris vittata L.), an As-hyperaccumulator, grown in soils with a gradient of As concentration near an arsenic sulphide mine. The root distribution was affected not only by the levels of soil As, but also by soil texture. Plants grew better in sandy loam soils than in clay soils....
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