Results 21 to 30 of about 90,458 (256)
Topological Indices of the Pent-Heptagonal Nanosheets VC5C7 and HC5C7
Advances in Materials Science and Engineering, 2019 In this paper, we computed the topological indices of pent-heptagonal nanosheet. Formulas for atom-bond connectivity index, fourth atom-bond connectivity index, Randić connectivity index, sum-connectivity index, first Zagreb index, second Zagreb index ...
Fei Deng +4 more
doaj +1 more source
Computing three topological indices for Titania nanotubes TiO2[m,n]
AKCE International Journal of Graphs and Combinatorics, 2016 A numeric quantity which characterizes the whole structure of a graph is called a topological index. The concept of Generalized Zagreb, atom–bond connectivity (ABC) and geometric–arithmetic (GA) topological indices was established in chemical graph ...
Jia-Bao Liu +3 more
doaj +1 more source
Topological Indices of Families of Bistar and Corona Product of Graphs
Journal of Mathematics, 2022 Topological indices are graph invariants that are used to correlate the physicochemical properties of a chemical compound with its (molecular) graph. In this study, we study certain degree-based topological indices such as Randić index, Zagreb indices ...
A. Khalid +5 more
doaj +1 more source
Aggregating Composite Indicators through the Geometric Mean: A Penalization Approach
Computation, 2022 In this paper, we introduce a penalized version of the geometric mean. In analogy with the Mazziotta Pareto Index, this composite indicator is derived as a product between the geometric mean and a penalization term to account for the unbalance among ...
Francesca Mariani, Mariateresa Ciommi
doaj +1 more source
On the arithmetic-geometric index of graphs
, 2020 Very recently, the first geometric-arithmetic index $GA$ and arithmetic-geometric index $AG$ were introduced in mathematical chemistry. In the present paper, we first obtain some lower and upper bounds on $AG$ and characterize the extremal graphs.
Cui, Shu-Yu +3 more
openaire +2 more sources
Extremal Chemical Graphs for the Arithmetic-Geometric Index
Match Communications in Mathematical and in Computer ChemistryThe arithmetic-geometric index is a newly proposed degree-based graph invariant in mathematical chemistry. We give a sharp upper bound on the value of this invariant for connected chemical graphs of given order and size and characterize the connected chemical graphs that reach the bound.
Hertz, Alain +5 more
openaire +4 more sources
Topological Indices of Certain Transformed Chemical Structures
Journal of Chemistry, 2020 Topological indices like generalized Randić index, augmented Zagreb index, geometric arithmetic index, harmonic index, product connectivity index, general sum-connectivity index, and atom-bond connectivity index are employed to calculate the bioactivity ...
Xuewu Zuo +4 more
doaj +1 more source
Proposal and validation of geostatistical-based metrics to quantify within-field variability [PDF]
Revista Brasileira de Ciência do SoloMetrics are fundamental to quantify and classify the spatial dependence of soil and agricultural attributes. This study aimed to propose and validate metrics based on two distinct approaches, one additive, which considers the arithmetic mean of the ...
Enio Júnior Seidel +1 more
doaj +1 more source
On Multiplicative Topological Invariants of Magnesium Iodide Structure
Journal of Mathematics, 2022 In recent times, the applications of graph theory in molecular and chemical structure research have far exceeded human expectations and have grown exponentially.
Zhiqiang Zhang +5 more
doaj +1 more source
On a mathematical theory of sustainability assessment
Proceedings (European Academy of Sciences and Arts), 2022 We compile a number of postulates to be satisfied by a function that mathematically assesses sustainability of some type: national, urban, energy, etc.
Yannis A. Phillis +3 more
doaj +1 more source