The isolation of 3,6,9,12-tetraazatetradecane-l,14-diamine (linear isomer of pentaethylene­ hexamine, linpen) from a technical polyamine mixture is described. In methanol, linpen acts as a hexadentate ligand towards cadmium(II). The solid compounds [Cd(linpen)](BPh4)2 (1), [Cd(linpen)](BPh4)2-2DM SO (2) and [Cd(linpen)](BF4)2 (3) have been isolated and character­ ized by elemental analysis, spe...

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Generalizing a theorem of McEliece, one obtains the highest power of p dividing all weights of a p-ary Abelian code, as a function of the set of nonzeros of that code. 1. Introduetion The important theorem of McEliece 7.8) on the weights of cyclic codes can be stated as follows. Let C be a cyclic code, of length n:;i: 0 (mod p), over the prime field GF(y) and let 'I' be the least positive integ...

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L'utilisation de donnees bibliographiques preparees par u n service centrale de catalogage automatise ainsi que les nouveaux media vont modifier profondement les activites de et les exigences ä l'indexation. La formation des bibliothecaires doit reagir avec des nouvelles idees ä cette nouvelle Situation. L'article präsent discute les objectifs de la formation, differents types d'examen, differe...

Orthorhombic [Pd(C,H8N2),Br2][Pd(C2H8N2)][C104]4, C8H32Br2Cl4N80 I6Pd2 , Mr = 890.42, crystallizes in space group Iba2, a = 9.651(2), b = 13.951(8), c 10.771(2) Ä, Z = 2, V = 1412.80 Ä, dc = 2.05 gem 3 , R = 0.0564 for 1545 unique reflections. Data collection: MoK a , A = 0.71069 Ä, room temperature. The structure is a typical Wolffram's Salt Analogue (WSA) with infinite stacks of planar [Pd(en...

We derive formulas for the terms in the conjectured asymptotic expansions of the moments, at the central point, of quadratic Dirichlet L-functions, L(1/2, χd), and also of the L-functions associated to quadratic twists of an elliptic curve over Q. In so doing, we are led to study determinants of binomial coefficients of the form det Ä( 2k−i−λk−i+1 2k−2j )ä .