Results 21 to 30 of about 193,960 (258)

Closed Formulas for Some New Degree Based Topological Descriptors Using M-polynomial and Boron Triangular Nanotube

Frontiers in Chemistry, 2021
In this article, we provide new formulas to compute the reduced reciprocal randić index, Arithmetic geometric1 index, SK index, SK1 index, SK2 index, edge version of the first zagreb index, sum connectivity index, general sum connectivity index, and the ...
Dong Yun Shin, Sabir Hussain, Farkhanda Afzal, Choonkil Park, Deeba Afzal, Mohammad R. Farahani   +5 more
doaj   +1 more source

On the Computation of Some Topological Descriptors to Find Closed Formulas for Certain Chemical Graphs

Journal of Chemistry, 2021
In this research paper, we will compute the topological indices (degree based) such as the ordinary generalized geometric-arithmetic (OGA) index, first and second Gourava indices, first and second hyper-Gourava indices, general Randic´ index RγG,for γ=±1,
Muhammad Haroon Aftab, Muhammad Rafaqat, M. Hussain, Tariq Zia   +3 more
doaj   +1 more source

On Certain Aspects of Topological Indices

Journal of Mathematics, 2021
A topological index, also known as connectivity index, is a molecular structure descriptor calculated from a molecular graph of a chemical compound which characterizes its topology.
Tanweer Ul Islam, Zeeshan Saleem Mufti, Aqsa Ameen, Muhammad Nauman Aslam, Ali Tabraiz   +4 more
doaj   +1 more source

Topological Evaluation of Four Para-Line Graphs Absolute Pentacene Graphs Using Topological Indices

International Journal of Analysis and Applications, 2023
A real-number to molecular structure mapping is a topological index. It is a graph invariant method for describing physico-chemical properties of molecular structures specific substances. In that article, We examined pentacene’s chemical composition. The
Mukhtar Ahmad, Muhammad Jafar Hussain, Gulnaz Atta, Sajid Raza, Irfan Waheed, Ather Qayyum   +5 more
doaj   +1 more source

Influence of wiring cost on the large-scale architecture of human cortical connectivity [PDF]

, 2014
In the past two decades some fundamental properties of cortical connectivity have been discovered: small-world structure, pronounced hierarchical and modular organisation, and strong core and rich-club structures.
A Fornito, A Zalesky, AK Seth, AL Traud, Anil K. Seth, B Karrer, BJ Baars, C Echtermeyer, C Koch, CC Hilgetag, CJ Honey, CJ Stam, D Bhowmik, D Holten, D Meunier, D Meunier, D Tomasi, D Tomasi, David Samu, DB Chklovskii, DC Van Essen, DJ Watts, DS Bassett, DS Bassett, DS Bassett, DS Modha, E Bullmore, E Ravasz, FD Rossa, G Tononi, G Zamora-López, G Zamora-López, H Johansen-Berg, H Pan, J Cabral, J Gómez-Gardeñes, JP Onnela, L Cammoun, L Danon, M Arthuis, M Kaiser, M Kaiser, M Kaiser, M Kaiser, M Kaiser, M Meila, M Rubinov, M Rubinov, M Shanahan, M Shanahan, M Shanahan, M Shanahan, M Steen, M Valencia, MD Greicius, MD Humphries, MD Humphries, ME Newman, ME Newman, ME Raichle, MEJ Newman, MEJ Newman, MG Kitzbichler, MP Van den Heuvel, MP van den Heuvel, O Sporns, O Sporns, O Sporns, O Sporns, O Sporns, O Sporns, O Sporns, O Sporns, O Sporns, O Sporns, Olaf Sporns, P Hagmann, R Milo, S Achard, S Boccaletti, S Jbabdi, S Maslov, S Mori, S Zhou, SB Seidman, SL Bressler, SP Borgatti, T Opsahl, T Sørensen, TE Conturo, Thomas Nowotny, V Colizza, V Latora, Y Chen, Y He, YY Ahn, ZJ Chen   +96 more
core   +7 more sources

Semi-Streaming Algorithms for Annotated Graph Streams [PDF]

, 2015
Considerable effort has been devoted to the development of streaming algorithms for analyzing massive graphs. Unfortunately, many results have been negative, establishing that a wide variety of problems require $\Omega(n^2)$ space to solve.
Thaler, Justin
core   +3 more sources

The Connectivity and the Harary Index of a Graph [PDF]

, 2012
The Harary index of a graph is defined as the sum of reciprocals of distances between all pairs of vertices of the graph. In this paper we provide an upper bound of the Harary index in terms of the vertex or edge connectivity of a graph.
Das, Diudea, Estrada, Feng, He, Ilić, Ivanciuc, Lučić, Plavčsić, Wiener, Xiao-Xin Li, Xu, Xu, Xu, Xu, Yi-Zheng Fan, Yu, Zhou   +17 more
core   +1 more source

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, Jia-Bao Liu, Hifza Iqbal, Kashif Ali, Syed Tahir Raza Rizvi   +4 more
doaj   +1 more source

Degree-Based Topological Indices of Boron B12

Journal of Chemistry, 2021
Topological index sometimes called molecular descriptor is a numerical value which associates a chemical composition for correlating chemical structure with numerous physical properties, chemical reactivity, or biological activity.
Nouman Saeed, Kai Long, Zeeshan Saleem Mufti, Hafsa Sajid, Abdul Rehman   +4 more
doaj   +1 more source

Optimality of Orthogonal Access for One-dimensional Convex Cellular Networks [PDF]

, 2013
It is shown that a greedy orthogonal access scheme achieves the sum degrees of freedom of all one-dimensional (all nodes placed along a straight line) convex cellular networks (where cells are convex regions) when no channel knowledge is available at the
Jafar, Syed A., Maleki, Hamed
core   +1 more source