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Neolithic triple-spiral symbol. Look up triskelion in Wiktionary, the free dictionary. A triskelion or triskeles is an ancient motif consisting either of a triple spiral exhibiting rotational symmetry or of other patterns in triplicate that emanate from a common center. The spiral design can be based on interlocking Archimedean spirals, or ...
Band theory derives these bands and band gaps by examining the allowed quantum mechanical wave functions for an electron in a large, periodic lattice of atoms or molecules. Band theory has been successfully used to explain many physical properties of solids, such as electrical resistivity and optical absorption , and forms the foundation of the ...
Most African sculpture was historically in wood and other organic materials that have not survived from earlier than at most a few centuries ago; older pottery figures are found from a number of areas. Masks are important elements in the art of many peoples, along with human figures, often highly stylized. There is a vast variety of styles ...
In semiconductors and insulators the two bands are separated by a band gap, while in conductors the bands overlap. A band gap is an energy range in a solid where no electron states can exist due to the quantization of energy. Within the concept of bands, the energy gap between the valence band and the conduction band is the band gap.
Bronze. Bronze is an alloy consisting primarily of copper, commonly with about 12–12.5% tin and often with the addition of other metals (including aluminium, manganese, nickel, or zinc) and sometimes non-metals, such as phosphorus, or metalloids, such as arsenic or silicon. These additions produce a range of alloys that may be harder than ...
Bell 214 – Reverse engineered and built in Iran. HESA Shahed 278 – Developed from Bell 206 & Panha Shabaviz 2061. HESA Shahed 285 – New Iranian Designed Attack Helicopter [19] [20] [21] Sorena (helicopter) Shahed 216 [22] Saba 248 – medium-weight, double-engine, quadrotor aircraft, capable of carrying eight occupants.
A new study finds that dark chocolate products sold nationwide may contain excessive amounts of heavy metals.
Legs and borders are typically made from a heavy, light-absorbing material similar to that of other stage drapes. One border downstage of a pair of legs forms a complete masking frame around the stage. Dependent on venue size, three or more sets of legs & borders may be employed at varying upstage distances from the proscenium.