Zobrazeno 1 - 10
of 424
pro vyhledávání: '"Bjørg N. Cyvin"'
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 72:706-718
The s-, σ, and ρ0-vectors are given for the tetrahedral XY4 molecular model. Vector methods have been used for constructing the (a) Coriolis Cα matrices, (b) matrix products G−1 Cα, and (c) the Cα matrices.
Publikováno v:
Polycyclic Aromatic Compounds. 13:1-8
Indacenoids are polygonal systems consisting of two pentagons each and arbitrary numbers of hexagons. They represent a class of polycyclic conjugated hydrocarbons. A fixed bond of a polygonal system is an edge which is or is not selected in all the K
Publikováno v:
Journal of Molecular Structure. 445:127-137
Staggered conformers of alkanes are represented by systems which can be embedded in the diamond lattice. Previous enumerations of alkane systems (acyclic) are supplemented. Original contributions are supplied to the numbers and symmetries of monocycl
Autor:
Zhang Fuji, Chen Rong-Si, S. J. Cyvina, Bjørg N. Cyvin, J. Brunvoll, S. El-Basil, Ivan Gutman
Publikováno v:
ResearcherID
A system of Class Qq is a polygonal system consisting of one central q-gon circumscribed by q other polygons, which may possess different sizes. As chemical graphs, these systems represent polycyclic conjugated hydrocarbons, which include homologous
Publikováno v:
Journal of Chemical Information and Computer Sciences. 37:460-466
An α-p-catapoly-q-gon is a catacondensed polygonal system with α p-gons and r − α q-gons, which represents a polycyclic conjugated hydrocarbon. Here r is the total number of polygons or rings. A complete mathematical solution for the numbers of
Publikováno v:
Journal of Mathematical Chemistry. 21:193-196
Tree‐like octagonal systems (O) are catacondensed systems of octagons, which represent a class of polycyclic conjugated hydrocarbons. Their numbers of isomers are determined and expressed in terms of generating functions.
Publikováno v:
Zeitschrift für Naturforschung A. 51:1073-1078
Polygonal systems P consist of exclusively hexagons and pentagons. They correspond (as chemical graphs) to a certain class of polycyclic conjugated hydrocarbons. This class includes protofullerenes. General formulations for the maximum numbers of int
Publikováno v:
Structural Chemistry. 7:263-271
An irreducible helicene is a helicene from which no hexagon can be deleted if it shall remain to be a helicene. The generation of irreducible helicenes from primitive coronoids is treated, and algebraic expressions are deduced for their numbers. Symm
Publikováno v:
Structural Chemistry. 7:183-186
A correspondence is pointed out between the triangulation of convex polygons on the one hand and the enumeration of isomers of conjugated polyenes on the other.