For the first time this study reported the success of using nanocrystalline hexagonal close-packed (hcp) nickel (Ni) modified composite graphite (CG) electrode (hcp-nano Ni/CG) for the electrocatalytic oxidation of glycerol in alkaline medium (0.1 M KOH). The hcp-nano Ni/CG electrode had an improve response and specificity on the electrocatalytic oxidation of glycerol over the bare CG. The elec...

A temperature-induced phase transition of a 2D H-bonded assembly, enabling quadruple H-bonding interactions, from a hexagonal porous network into a close-packed rhombic arrangement has been observed on Ag(111) by STM imaging.

In order to predict the stable polymorph of iron under core conditions, calculations have been performed on all the Ž . Ž . candidate phases proposed for inner core conditions, namely, body-centred cubic bcc , body-centred tetragonal bct , Ž . Ž . hexagonal close-packed hcp , double-hexagonal close-packed dhcp and an orthorhombically distorted hcp polymorph. Our simulations are ab initio free e...

In Euclidean d-spaces, the container problem asks to pack n equally sized spheres into a minimal dilate of a fixed container. If the container is a smooth convex body and d ≥ 2 we show that sequences of solutions to the container problem can not have a “simple structure”. By this we in particular find that there exist arbitrary small r > 0 such that packings with spheres of radius r into a smoo...

In an Euclidean d-space, the container problem asks to pack n equally sized spheres into a minimal dilate of a fixed container. If the container is a smooth convex body and d ≥ 2 we show that solutions to the container problem can not have a “simple structure” for large n. By this we in particular find that there exist arbitrary small r > 0, such that packings in a smooth, 3-dimensional convex ...