The solar corona is a tenuous outer atmosphere of the Sun. Its million-degree temperature was discovered spectroscopically in the 1940s, but its origin has been debated since then without complete convergence. Currently there are two classes of models; the wave theory and the microflare/nanoflare theory. Both models have merits and disadvantages, but the essential issues are nearly pinned down....

Objectives: To examine rooted products graph and corona product of path with itself cycle for the existence d-lucky labeling. Methods: In this study, number Rooted to (Pn ◦ Pn) Corona (Pn⊙ are computed. Method construction is used throughout paper prove theorems. Findings: admit labeling numbers same obtained. Novelty: some graphs obtained by authors but new findings. Keywords: Proper Lucky lab...

the amount of antibodies produced in colostrum following injection of the trivalent rota-corona virus and e. coli vaccine was evaluated to undrestand the priventive effects of vaccine against calf diarrhea. forthy six and 27 pregnant cows were selected from industrial dairy herds as a treatment and control groups, respectively in urmia iran. a 5 ml trivalent rota-corona virus and e .coli vaccin...

‘Domination in graphs’ has been studied extensively and at present it is an emerging area of research in graph theory. An introduction and an extensive overview on domination in graphs and related topics is surveyed and detailed in the two books by Haynes et al. [1,2]. Product of graphs occurs naturally in discrete mathematics as tools in combinatorial constructions. They give rise to an import...

The Wiener index W (G) of a connected graph G is defined as W (G) = ∑ u,v∈V (G) dG(u, v) where dG(u, v) is the distance between the vertices u and v of G. For S ⊆ V (G), the Steiner distance d(S) of the vertices of S is the minimum size of a connected subgraph of G whose vertex set is S. The k-th Steiner Wiener index SWk(G) of G is defined as SWk(G) = ∑ S⊆V (G) |S|=k d(S). We establish expressi...