in theoretical chemistry, molecular structure descriptors are used to compute properties of chemical compounds. among them wiener, szeged and detour indices play significant roles in anticipating chemical phenomena. in the present paper, we study these topological indices with respect to their difference number.

I s tv£n B£tori and Stefan Marok FB 2 Linguis t ics E W H Rhein land-Pfa lz , l~heinun 3-4, D-5400 Koblenz~ F R G The paper presents a concise description of the LFG-ParserGenerator developed at the EWH in Koblenz. Special attention is paid to efficiency considerations to speed up the system in the execution phase. Lexicon is separated, ll(k)-parsing tables are used and some preliminary ratific...

A hybrid algorithm combining Regrouping Particle Swarm Optimization (RegPSO) with wavelet radial basis function neural network referred to as (RegPSO-WRBF-NN) algorithm is presented which is used to detect, identify and characterize the acoustic signals due to surface discharge activity and hence differentiate abnormal operating conditions from the normal ones. The tests were carried out on cle...

in this paper, the degree distance and the gutman index of the corona product of two graphs are determined. using the results obtained, the exact degree distance and gutman index of certain classes of graphs are computed.