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黑龙江中药党参中微量元素分析 总被引:2,自引:0,他引:2
用发射光谱、吸收光谱和电位法,对党参中微量元素进行定性定量分析,并通过数理统计方法对实验数据作F、r、Q检验及变异系数、可信度的计算、方法得当。对中药配伍提供了参考。 相似文献
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Based on the tight-binding approximation, analytical solutions of the energy dispersion and band gap of armchair-edge graphene nanoribbons (AGNRs) under uniaxial strains are derived. Subsequent numerical results on band gap are found to be consistent with the analytical solutions. It is shown that the energy gap of AGNRs is sensitive to the uniaxial strains and is predicted to change with a V shape as a function of the applied uniaxial strain. It is interesting to find that the uniaxial strain could induce metal-semiconductor transition for the AGNRs with a width of n=3m+2 ((3m + 2)-AGNRs) and semiconductor-metal-semiconductor phase transition for the (3m + 1)-AGNRs, but no phase transition is induced for the 3m-AGNRs. 相似文献
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