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On some binary codes from orthogonal geometry of characteristic two
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: B.G. RodriguesIn their natural primitive rank-3 action on the singular and non-singular points of the projective space of dimension 2m − 1, the simple orthogonal groups O ε 2m (F2), for ε = ±1 and m ≥ 3 have... -
On the stabilizers of the minimum-weight codewords of some binary codes from graphs on triples
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: B.G. RodriguesWe determine the stabilizers of the minimum-weight codewords for the binary codes C 2(n) and C 2(n)⊥ obtained from an adjacency matrix of the graph A 2(n) for n ≥ 7 and odd, with vertex set Ω{3}, and adjacency defined... -
Codes related to line graphs of triangular graphs and permutation decoding
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Washiela Fish --- Department of Mathematics and Applied Mathematics, South Africa Khumbo Kumwenda --- Department of Mathematics and Applied Mathematics, South Africa Eric Mwambene --- Department of Mathematics and Applied Mathematics, South AfricaFor any prime p, we consider p-ary linear codes obtained from the row span of incidence matrices of line graphs of triangular graphs and adjacency matrices of their line graphs. We determine parameters of the codes, their automorphism groups and... -
Breeding strategies for forest trees: Concepts and challenges
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: T White --- School of Forest Resources and Conservation, U.S.A.This paper describes some recent developments that affect the way forest geneticists think about breeding strategies for forest trees. The topics are grouped into several categories: (1) General Concepts; (2) Breeding Population Size; (3) Breeding Population Structure; (4) Management of... -
The economic importance and impacts of intellectual property rights (IPRs) in Sudan
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Samia Satti Osman Mohamed Nour --- UNU-MERIT, School of Business and Economics, The NetherlandsThis paper explains the importance of IPRs and examines the factors hindering and those contributing toward enhancing IPRs in Sudan. We find that the inadequacy of IPRs protection in Sudan is attributed to low integration in the international institutions, lack...