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Hypersensitive and highly selective nanomaterials for the measurement of heavy metal ions (HMIs) hold a key to electro-analysis. Various works improved the results of analysis but without scientific understanding. Herein, Fe/Mg/Ni-layered double hydroxide (LDH) has been successfully prepared and its electrochemical behavior for Pb(II) detection is also studied using square wave anodic stripping voltammetry...
The gaps between the metafrontier production function and the firm-specific frontier production function is caused mainly by the technology heterogeneity or the difference in technology and production techniques employed by different firms. Different from the routine way to estimate the technology gaps by data envelopment analysis, this study uses the varying coefficients regression model to estimate...
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