Results 21 to 30 of about 275,044 (284)

On Distance-Based Topological Descriptors of Chemical Interconnection Networks

Journal of Mathematics, 2021
Structure-based topological descriptors of chemical networks enable us the prediction of physico-chemical properties and the bioactivities of compounds through QSAR/QSPR methods.
Min Hu, Haidar Ali, Muhammad Ahsan Binyamin, Bilal Ali, Jia-Bao Liu, Chengmei Fan   +5 more
doaj   +1 more source

M-Polynomials and Topological Indices for Line Graphs of Chain Silicate Network and H-Naphtalenic Nanotubes

Journal of Mathematics, 2021
Graph theory has provided a very useful tool, called topological index, which is a number from the graph M with the property that every graph N isomorphic to M value of a topological index must be same for both M and N.
Muhammad Irfan, Hamood Ur Rehman, Hassan Almusawa, Saffina Rasheed, Imran Abbas Baloch   +4 more
doaj   +1 more source

Topological Steric Effect Index and Its Application. [PDF]

ChemInform, 2004
This paper proposed a Topological Steric Effect Index (TSEI) of a group based on the relative specific volume of the reaction center screened by the atoms of the substituents. Investigated results show good correlations between the parameter TSEI and the dihedral angles between both phenyl rings determined by photoelectron spectroscopy for 7 ...
Chenzhong, Cao, Li, Liu
openaire   +2 more sources

Topological insulator and the Dirac equation [PDF]

, 2011
We present a general description of topological insulators from the point of view of Dirac equations. The Z_{2} index for the Dirac equation is always zero, and thus the Dirac equation is topologically trivial.
Dirac P. A. M., König M., Volovik G. E., Zhang Y.   +3 more
core   +2 more sources

Topological dynamics indexed by words

Topology and its Applications, 2012
20 ...
Farmaki, V., Koutsogiannis, A.
openaire   +3 more sources

The topological period-index conjecture

Mathematical Research Letters, 2021
comments ...
Antieau, Benjamin, Williams, Ben
openaire   +2 more sources

Some Topological Invariants of Graphs Associated with the Group of Symmetries

Journal of Chemistry, 2020
A topological index is a quantity that is somehow calculated from a graph (molecular structure), which reflects relevant structural features of the underlying molecule.
Chang-Cheng Wei, Muhammad Salman, Usman Ali, Masood Ur Rehman, Muhammad Aqeel Ahmad Khan, Muhammad Hasanain Chaudary, Farooq Ahmad   +6 more
doaj   +1 more source

GTI-space : the space of generalized topological indices [PDF]

, 2008
A new extension of the generalized topological indices (GTI) approach is carried out torepresent 'simple' and 'composite' topological indices (TIs) in an unified way.
A.R Matamala, A.R Matamala, A.T Balaban, Adelio R. Matamala, B Zhou, D. Plavšić, D.J Klein, D.J Klein, D.J Klein, E Estrada, E Estrada, E. Estrada, E. Estrada, E. Estrada, E. Estrada, E. Estrada, Ernesto Estrada, G.G Cash, H Wiener, H.P Schultz, H.P Schultz, I Gutman, I Gutman, I Gutman, I Gutman, J. Gálvez, J. Gálvez, J.R Votano, M. Randić, M. Randić, O Ivanciuc, R Todeschini, R.F Brown, W.R. Müller, Z. Mihalić   +34 more
core   +1 more source

Index theorem on chiral Landau bands for topological fermions

, 2021
Topological fermions as excitations from multi-degenerate Fermi points have been attracting increasing interests in condensed matter physics. They are characterized by topological charges, and magnetic fields are usually applied in experiments for their ...
Yang, Shengyuan A., Zhao, Y. X.
core   +1 more source

Topological properties of Graphene using some novel neighborhood degree-based topological indices

International Journal of Mathematics for Industry, 2019
Topological indices are numeric quantities that transform chemical structure to real number. Topological indices are used in QSAR/QSPR studies to correlate the bioactivity and physiochemical properties of molecule.
Sourav Mondal, Nilanjan De, Anita Pal
doaj   +1 more source