Results 31 to 40 of about 1,607 (200)
Geometric perspective to Degree–Based topological indices of supramolecular chain
Results in Engineering, 2022 Sombor index and their types are introduced pertaining to Euclidean geometry. In graph-theoretical terminology, it is the sum of all pairs of adjacent vertices di2+dj2 given di is the degree of ith vertex.
Muhammad Imran +4 more
doaj +1 more source
Regional characteristics of cloudiness in Serbia during the period 1991–2017
Meteorological Applications, Volume 30, Issue 2, March/April 2023., 2023 The relationship between the monthly cumulative numbers of cloudy‐sky days versus the NAO index in the winter seasons (1991–2017) for 38 analysed climatological stations in Serbia. The correlation coefficient between these two time series is statistically significant (r = −0.56, α = 0.01).
Katarina Veljović Koračin +2 more
wiley +1 more source
Ecology and Evolution, Volume 13, Issue 1, January 2023., 2023 We studied how reed habitat quality and management influence brood parasitism rate and offspring survival in Common Cuckoos parasitizing nests of Great Reed Warblers in six reed habitats in an intensive agricultural landscape. Brood parasitism rate was highest on large canals and was positively influenced by the availability of potential perches, while
Thomas Oliver Mérő +2 more
wiley +1 more source
Ecology and Evolution, Volume 12, Issue 10, October 2022., 2022 In this study, we report on three extreme cases of within season nest reuse in an open nesting passerine. In first case, one nest successfully fledged young after the nest was reused for the second time (two‐time nest reuse), in the second case, one nest was depredated after nest reuse, and in the third case, the female laid a new clutch among the ...
Thomas Oliver Mérő +3 more
wiley +1 more source
On Computing Techniques for Sombor Index of Some Graphs
Mathematical Problems in Engineering, Volume 2022, Issue 1, 2022., 2022 In all types of topological indicators, degree‐based indicators play a major role in chemical graph theory. The topological index is a fixed numeric value associated with graph isomerism. Firstly, in 1972, the concept of degree‐based index was developed by Gutman and Trinajstic.
Kiran Naz +3 more
wiley +1 more source
On the spectral radius, energy and Estrada index of the Sombor matrix of graphs [PDF]
Transactions on Combinatorics, 2023 Let $G$ be a simple undirected graph with vertex set $V(G)=\{v_1, v_2,\ldots,v_n\}$ and edge set $E(G)$. The Sombor matrix $\mathcal{S}(G)$ of a graph $G$ is defined so that its $(i,j)$-entry is equal to $\sqrt{d_i^2+d_j^2}$ if the vertices $v_i$ and ...
Zhen Lin, Ting Zhou, Lianying Miao
doaj +1 more source
Journal of Function Spaces, Volume 2022, Issue 1, 2022., 2022 Coronavirus is a family of viruses that cause upper respiratory infections in humans. It has several variants, e.g., SARS and MERS, and now, a new variant has been identified in 2019 which is the novel coronavirus disease 2019. The novel coronavirus disease 2019 (COVID‐19) first appeared in Wuhan, China, and quickly spread throughout the world.
Shahid Amin +5 more
wiley +1 more source
Sombor index of zero-divisor graphs of commutative rings
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2022 In this paper, we investigate the Sombor index of the zero-divisor graph of ℤn which is denoted by Γ(ℤn) for n ∈ {pα, pq, p2q, pqr} where p, q and r are distinct prime numbers. Moreover, we introduce an algorithm which calculates the Sombor index of Γ(ℤn)
Gürsoy Arif +2 more
doaj +1 more source
Degree‐Based Molecular Descriptors and QSPR Analysis of Breast Cancer Drugs
Journal of Mathematics, Volume 2022, Issue 1, 2022., 2022 The disease that involves abnormal cell growth and spreads through the surrounding tissues damaging other parts of the body is cancer. Breast cancer is the most common one out of many types. Women are affected by breast cancer either by hormonal changes or genetic changes that occur in DNA.
M. C. Shanmukha +4 more
wiley +1 more source
Indicators of tourism development of the Serbian danube region [PDF]
, 2018 Protected natural area in the Danube region covers 107,200 hectares and includes two national parks, two nature parks, one place of outstanding natural beauty, five special natural reserves, twenty-five nature monuments, and two sites of international ...
Berjan, S., El Bilali, H., Lukić, D.
core +2 more sources