Preface vii List of participants ix Rings whose proper images are almost self-injective Adel Alahmadi, André Leroy, and Surender K. Jain 1 Enveloping skewfields of the nilpotent positive part and the Borel subsuperalgebra of osp(1, 2n) Jacques Alev and François Dumas 7 The Krull-Schmidt-Remak-Azumaya Theorem for G-groups Meltem Altun-Özarslan and Alberto Facchini 25 Good codes from metacyclic groups Samir Assuena and César Polcino Milies 39 The prime ideals and simple weight modules of the algebra U(b V3) V. V. Bavula and T. Lu 49 n-torsion clean rings Peter Danchev and Jerzy Matczuk 71 Generating characters of non-commutative Frobenius rings Steven T. Dougherty, Arda Kör, and André Leroy 83 Constacyclic codes over local rings of order 16 Steven T. Dougherty and Esengül Saltürk 93 Skew Reed-Muller codes Willi Geiselmann and Felix Ulmer 107 The extension theorem for bi-invariant weights over Frobenius rings and Frobenius bimodules Oliver W. Gnilke, Marcus Greferath, Thomas Honold, Jay A. Wood, and Jens Zumbrägel 117 Dual skew codes from annihilators: Transpose Hamming ring extensions José Gómez-Torrecillas, F. J. Lobillo, and Gabriel Navarro 131 Injective hulls of simple modules over nilpotent Lie color algebras Can Hatipoğlu 149 U -rings generated by its idempotents Yasser Ibrahim and Mohamed Yousif 157

Results obtained by studying the possibility of replacing cement in mortars with local industrial by-products, i.e. with silica fume and red mud, are provided in the paper. The results of fresh and hardened mortar properties tests conducted on five mixtures in two series are presented. 10% of cement was replaced with silica fume, and 0%, 5%, 10%, 15% and 20% of cement weight was replaced with red mud. The first series was tested after 28 days of curing, and the second series was subjected to freezing and thawing cycles after proper curing, and then submitted to testing. The results point to satisfactory behaviour of mixtures with a low red mud content.