On the determinacy of repetitive structures

This paper shows that repetitive, infinite structures cannot be simultaneously statically, and kinematically, determinate.     

6α-formylpenicillins and derivatives

Moffatt type oxidation of 6α-(hydroxymethyl)penicillins has produced a series of 6α-formylpenicillins, which were further used in chain extension reactions with Wittig reagents and diazoalkanes.     

On the contribution of triply-excited and quadruply-excited configurations to electron correlation energies in closed-shell systems

The contribution made by triply-excited and quadruply-excited configurations to electron correlation energies in closed-shell systems is examined in detail. Many-body perturbation theory is used to calculate the contribution of these configurations to the correlation energies in 25 atoms and molecules. Calculations are performed for the nitrogen, carbon monoxide and carbon monosulphide molecules for a range of nuclear geometries.     

Symmetric prismatic tensegrity structures. Part II: Symmetry-adapted formulations

This paper presents analytical formulations for the symmetry-adapted equilibrium, force density and geometrical stiffness matrices for prismatic tensegrity structures with dihedral symmetries. An analytical expression for the infinitesimal mechanisms is also derived.