In most cases, back pain will improve in a few weeks or months, although some people experience long-term pain or pain that keeps coming back. Types of back pain Backache is most common in the lower back ('lumbago'), although it can be felt anywhere along your spine, from your neck down to your hips.
Graphene (/ËÉ¡raef.ËÉ¡rÃ¦f/) iËn is an allotrope of carbon in the form of a-two, dimensional-atomic, scale hexagonal lattice in which one atom forms each. Vertex it is the basic structural element of other, allotropes including, graphite, charcoal carbon nanotubes and. fullerenes
The symmetry can also be broken by doping one layer of graphene with metal atoms, but such doping is hard to control. The team built their device by making a bottom gate layer out of silicon, with a thin layer of silicon oxide as an insulator. On top, they placed the two layers of graphene, with gold at each end to act as a source and a drain.