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Hace 1 día · Catharism (/ ˈ k æ θ ər ɪ z əm / KATH-ər-iz-əm; from the Ancient Greek: καθαροί, romanized: katharoí, "the pure ones") was a Christian quasi-dualist or pseudo-Gnostic movement which thrived in Southern Europe, particularly in northern Italy and southern France, between the 12th and 14th centuries. Denounced as a heretical sect by the Catholic Church, its followers were attacked ...
Hace 1 día · A carbon nanotube (CNT) is a tube made of carbon with a diameter in the nanometre range ().They are one of the allotropes of carbon.. Single-walled carbon nanotubes (SWCNTs) have diameters around 0.5–2.0 nanometres, about 100,000 times smaller than the width of a human hair.They can be idealised as cutouts from a two-dimensional graphene sheet rolled up to form a hollow cylinder.
