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The study on metal oxide nanoparticles, their synthetic methodologies and procedures, nanoscale physicochemical features, and particular industrial applications in several sectors of applied nanotechnology, including metal oxide nanoparticles as essential technological materials, is reviewed in this work. Pulsed laser deposition has been utilized to produce gas sensitive layers in this study, which gives a detailed description of employing semiconducting metal oxide in gas sensors applications. [ABSTRACT FROM AUTHOR]

The atom-bond connectivity (ABC) index is one of the newly most studied degree based molecular structure descriptors, which have chemical applications. For a graph G, the ABC index can be defined ABC(G)=∑uvE(G)∊dv+du-2/dv.du, whereu,, the degree of the vertex u is the number of edges with u as an end vertex denotes the degree of a vertex u in G. In this paper, we establish the general formulas for the atom bond connectivity index of molecular graphs of alkenes and cycloalkenes. [ABSTRACT FROM AUTHOR]