More than 90% of Malaysian roads are constructed using asphaltic concrete. However, previous investigations of asphaltic concrete have mainly concentrated on the macroscopic properties of the composite materials based on the assumption that the mixtures are homogeneous and isotropic. This paper applies a digital image processing technique to compare the orientations of coarse aggregate particle...

Crossed complexes have longstanding uses, explicit and implicit, in homotopy theory and the cohomology of groups. It is here shown that the category of crossed complexes over groupoids has a symmetric monoidal closed structure in which the internal Hom functor is built from morphisms of crossed complexes, nonabelian chain homotopies between them and similar higher homotopies. The tensor product...

Abstract If G is a group acting geometrically on CAT(0) cube complex X and if g ? has infinite order, we show that exactly one of the following situations occurs: (i) defines rank-one isometry ; (ii) stable centraliser SC ( ) = { h ? ? n ? 1, [ , ] 1} not virtually cyclic; (iii) Fix Y finite for every 1 sequence (Fix )) takes infinitely many values, where cubical component Roller boundary which...

the free enzyme. Similarly, the apparent molecular weight of the slower-migrating band will be lower than that of the free aggregate. In our experiments, the molecular weight of the aggregate appears to be more than twice that of the free enzyme. On this basis, one could propose a dimer-hexamer association. Associations of this type are less favourable geometrically than dimer-tetramer or dimer...

A cubical analogue of Stanley’s theorem expressing the cd-index of an Eulerian simplicial poset in terms of its h-vector is presented. This result implies that the cd-index conjecture for Gorenstein∗ cubical posets follows from Ron Adin’s conjecture on the non-negativity of his cubical h-vector for Cohen-Macaulay cubical posets. For cubical spheres the standard definition of shelling is shown t...