In this work, inhibitory behaviour of the new azomethan compound (I-N-C8) was studied by electrochemical potentiodynamic polarization (PDP), impedance spectroscopy (EIS), and electrochemical frequency modulation (EFM), mass loss measurement, and UV-Visible spectroscopy. The structure was determined by Fourier transform infrared spectroscopy FTIR and mass spectrometry. Also the thermotropic behaviour of the studied liquid-crystal was determined by differential scanning calorimetry (DSC). The results showed that, the prepared compound revealed liquid-crystalline properties and high inhibition efficiency of about 96 %. These results make it more preferred than other inhibitors, in addition to the low cost, more availability of raw material and reduction of pollution.
Elsonbaty and Daoud introduced a new type of labelling of a graph G with p vertices and q edges called an edge even graceful labelling if there is a bijection f from the edges of the graph to the set {2, 4,. .. , 2q} such that, when each vertex is assigned the sum of all edges incident to it mod 2k, where k = max(p, q), the resulting vertex labels are distinct. They proved necessary and sufficient conditions for some path and cycle-related graphs to be edge even graceful. In this paper we proved that triangular book graphs and quadrilateral book graphs admit edge even graceful labelling.
Elsonbaty and Daoud introduced a new type of labelling of a graph G with p vertices and q edges called an edge even graceful labelling. A graph G is called edge even graceful if there is a bijection f : E(G) → {2, 4,. .. , 2q} such that, when each vertex is assigned the sum of all edges incident to it mod 2k, where k = max(p, q), the resulting vertex labels are distinct. In this paper we proved that double fan graphs, quadrilateral friendship graphs, and butterfly graphs are edge even graceful graphs.
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