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Deficiency of selenium (Se) will lead to malnutrition and decreased immune function of the body. There is a common phenomenon of Se deficiency in foods. In this study, different concentrations of sodium selenite (Na2SeO3) were applied to Moringa oleifera grownin soil. The purpose was to explore the feasibility of Se biofortification of M. oleifera root. The effect of exogenous Se on the accumulation of Se and cadmium (Cd) in the roots of M. oleifera was studied by inductively coupled plasma mass spectrometry, and the mechanism of exogenous Se on the accumulation of Se and Cd in the roots was studied by Fourier transform infrared spectroscopy (FTIR) combined with principal component analysis and partial least squares regression analysis. The results showed that Na2SeO3 significantly affected the accumulation of Se and Cd in the roots (p < 0.05). The increase in Se was highest when Na2SeO3 was around 4.0 mg/kg, which increased by 315% compared with the control. The decrease in Cd was the lowest when Na2SeO3 was around 2.0 mg/kg, which decreased by 80% compared with the control. The results of FTIR analysis showed that Na2SeO3 treatment changed the carboxylate, phosphate radical, hemicellulose and protein in roots of M. oleifera, while the increase of Se was related to hemicellulose, protein, polysaccharide and lignin, and the decrease of Cd was related to hemicellulose and protein. The results showed that exogenous Se increased the accumulation of Se and inhibited the absorption of Cd. Therefore, the roots of M. oleifera can be used in Se biofortified products.

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The flow fields of single airfoil model and symmetry airfoil model were simulated by CFD software in this paper. the different inducing velocity and the airfoil intervals were considered to study the flow field and the induction rate change of the models. The results show that the induction rates of the single airfoil model and the symmetry airfoil model enlarge when the inducing velocity increases,and gradually reaching a steady value .As interval of the symmetry airfoil model is increased, the induction rate increases.The air flow from the narrow slits of symmetry model can be mixed and disturbed each other.Therefore, the induction rate of symmetry airfoil model is not a simple superposition of the single airfoil model under the same inducing velocity. Induction rate and airfoil interval are the key factors to optimize the airfoil model.