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A hemispherical head ("hemi-head") gives an efficient combustion chamber with minimal heat loss to the head, and allows for two large valves.However, a hemi-head usually allows no more than two valves per cylinder due to the difficulty in arranging the valve gear for four valves at diverging angles, and these large valves are necessarily heavier than those in a multi-valve engine of similar ...
The division of Earth by the Equator and the prime meridian Map roughly depicting the Eastern and Western hemispheres. In geography and cartography, hemispheres of Earth are any division of the globe into two equal halves (hemispheres), typically divided into northern and southern halves by the Equator and into western and eastern halves by the Prime meridian.
Meaning Origin language and etymology Example(s) -iasis: condition, formation, or presence of Latin -iasis, pathological condition or process; from Greek ἴασις (íasis), cure, repair, mend mydriasis: iatr(o)-of or pertaining to medicine or a physician (uncommon as a prefix but common as a suffix; see -iatry)
The almost perfect circle (the earth is an oblate spheroid that is wider around the equator), drawn with a line, demarcating the Eastern and Western Hemispheres must be an arbitrarily decided and published convention, unlike the equator (an imaginary line encircling Earth, equidistant from its poles), which divides the Northern and Southern hemispheres.
The prefix hemi, meaning half, refers to the one alcohol added to the carbonyl group. This is half of the required alcohols to form acetals or ketals. [2] Cyclic hemiacetals can sometimes be referred to as lactols. [3]
Hemisphere Project, a counternarcotics program between United States federal and state drug officials and AT&T Topics referred to by the same term This disambiguation page lists articles associated with the title Hemisphere .
These "hemi" faces lie parallel to the faces of some other symmetrical polyhedron, and their count is half the number of faces of that other polyhedron – hence the "hemi" prefix. [1] The prefix "hemi" is also used to refer to certain projective polyhedra, such as the hemi-cube, which are the image of a 2 to 1 map of a spherical polyhedron ...
These engines were based on the Hemi engines, using the same blocks and crankshaft parts, but completely different cylinder heads, pushrods, exhaust manifolds and pistons. They were called Polyspheric or Poly engines, because they featured polyspherical-shaped (meaning "more than one sphere") combustion chambers. These were formed by two ...