Search results for "Honeycomb"
showing 3 items of 33 documents
A distorted honeycomb motif in divalent transition metal compounds based on 4-phosphonbenzoic acid and exchange coupled Co(II) and Cu(II): synthesis,…
2013
The first example of a two-dimensional inorganic hybrid material with cobalt as an open-shell transition metal ion and 4-phosphonbenzoic acid as a linker is presented together with its copper analogue. For both metal ions the inorganic part consists of edge-sharing metal–oxygen octahedra leading to a metal honeycomb motif. The magnetic properties of the cobalt compound are reported together with those of the corresponding copper compound based on the remarkably six-coordinated copper(II) ions.
Topological surface wave metamaterials for robust vibration attenuation and energy harvesting
2021
International audience; We propose topological metamaterials working in Hertz frequency range, constituted of concrete pillars on the soil ground in a honeycomb lattice. Based on the analog of the quantum valley Hall effect, a non-trivial bandgap is formed by breaking the inversion symmetry of the unit cell. A topological interface is created between two different crystal phases whose robustness against various defects and disorders is quantitatively analyzed. Finally, we take advantage of the robust and compact topological edge state for designing a harvesting energy device. The results demonstrate the functionality of the proposed structure for both robust surface vibration reduction and …
Looking for ancient wine as gift for the Prince of Lavau (5th c. BC)
2017
International audience; The excavations at Lavau brought to light a large monumental necropolis with a central burial mound overlying an undisturbed chieftain’s grave from the end of the Early Iron Age or the beginning of the Late Iron Age. In the funerary chamber rich grave furniture accompanied the dead: a bronze cauldron containing serving and drinking vessels of ceramic, silver, and bronze, two bronze plates, and a cist. As there were visible deposits present on the inner surface of the cauldron, a series of samples were taken from different parts of the cauldron and the locally made oenochoe. Using a double-step methodology of extraction and structural analysis by GC-MS, the main bioma…