HEKLA (Hekla), an active volcano on a southwest of Iceland. An altitude of 1491 m. For the last 700 flying ok. 20 large eruptions (the most destructive in 1766 and 1947-48).

HEXAGONAL SINGONIJA, crystallographic singonija, of which the ratio between angles is typical (???) and crossbars (a, b, c) a unit cell of a crystal: and = in? c? =? =90 °? = 120 °. It is sectioned into 7 point groups of a symmetry.

GEKSADEKAN, the same, that tsetan.

HEXAMETHYLENE DIAMINE, H2N (CH2) 6NH2, colourless crystals, tïë 39-42 °S. It is applied to synthesis of polyamides, polyurethanes.

HEXAMETHYLENETETRAMINE (hexamin, a urotropine), Ñ6Í12N4, colourless crystals of a sweet taste; it is sublimated in vacuo above 230 °S, it is charred at 280 °S. Hardener of phenolic formaldehyde resins, raw material for synthesis of blasting explosives (oktogena, hexogen), solid smokeless combustible (t. n. Solid alcohol), an antiseptic agent, a corrosion inhibitor.

HEXANE (normal hexane), ÑÍ3 (ÑÍ2) 4-ÑÍ3, a colourless liquid, têèï 68,74 °S. It is contained in petroleum; at their chemical processing (napr., reforming) turns to benzole; at an isomerization will derivate izogeksan - a high-octane component of engine fuels. It is applied as the solvent and a liquid in frigorimeters.

GEKSAFERRITY, ferrites with hexagonal crystalline structure. Are most distributed geksaferrity with formula (MO) (Fe2Î3) 6, where M - Va, Sr or Pb.

HEXACHLORETHANE, Ñ2Ñl6, colourless crystals, tïë 187 °S. A replacer of camphor in manufacture of a nitrate cellulose, an intensifier of a luminescence of pyrotechnic structures, the smoke generator (in a mix with some metals), a helminthicide for animal.

CUBE (from grech. hex - six and hedra - an edge), a hexahedron, routinely correct hexahedron, i.e. a cube.

GEKSLI Î., see Haksli About.

GEKSLI (Haksli) (Huxley) Thomas Genri (1825-95), the English biologist, colleague C.Darvina and the most outstanding propagandist of his doctrine, foreign corresponding member Petersburg AN (1864). The president (1883-85) London royal societies. Rather - anatomic probes, has proved morphological affinity of the person and the maximum monkeys, birds and kowtowing, medusas and polyps. Has advanced and has justified regulations about unity of a structure of a skull for vertebrates.

HEXOGEN (tsiklotrimetilentrinitramin), vysokobrizantnoe a blasting explosive. A white crystalline powder. Heat of explosion of 5,5 MDZH/KG. It is water-resistant. It is applied in an ammunition, a detonating cord, in structures to shaped charges, etc.

HEXOSES, monosaccharides which molecules contain 6 atoms of carbon. To hexoses concern a glucose, a galactosis, a fructose, etc.

HECTARE (from a hecto... And the are), a unit of area in a metrical measurement, is meant ga. 1 ga - 100 are - 10000 m2.

HECTO... (from grech. hekaton - hundred), a prefix for education of names of aliquot units, to equal 100 initial units. A contracted notation-. Napr., 1 gPa (hectopascal) - 100 Pa.

The HECTOGRAPH (from a hecto... And... Columns), the elementary device for reproduction of the text and case histories. It is invented in Russia M.I.Alisovym in 1869. On the hectograph received up to 100 copies of a first copy.

HECTOR, in "Illiada" one of main Trojan heroes, the higher son of tsar of Troy Priama and Gekuby; has perished in a single combat with Ahillom, revenging Hector for assassination of his friend Patrokla.

GEKUBA (Gekaba), in "Illiada" the wife of Trojan tsar Priama, mother Hector, Parisa, Leatherleafs, etc., lost in Trojan war of the husband and almost all children; after fall of Troy Gekuba has become captive Odisseja, has perished at a ferrying through Hellespont. Mode Gekuby was included in the classical literature (Evripid, Dante, Shakespeare) and has become olitsetvoreniem boundless grief and despair.

GELASY Kritsky (mind. 250), the Christian martyr damaged in persecution of emperor Detsija. Memory in the Orthodox church on December, 23 (on January, 5).

GELASY Uglichsky (mind. 1609), prepodobnomuchenik, perished at ruin of Uglich by Poles in Vague time. Memory in the Orthodox church on May, 23 (on June, 5) (a cathedral Rostovo-Yaroslavl sacred).