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17 “... electrostatics/electrodynamics theory. The treatment is highly mathematical, which tends to obscure...”

18 “... and catalytic nanomaterials, the synthesis mechanisms of nanomaterials using plasma still remain obscure due...”

19 “... and the fourth industrial revolution (4IR). Disruptive technologies and cyber-physical systems, obscuring...”

20 “... of spatial analytical tools and necessary data have enabled us to reveal multifaceted, obscured spatial...”