computer calculations
81Skewes' number — In number theory, Skewes number can refer to any of several extremely large numbers used by the South African mathematician Stanley Skewes as upper bounds for the smallest natural number x for which :π( x ) > li( x ),where π( x ) is the prime… …
82chemical kinetics — Introduction the branch of physical chemistry (chemistry) that is concerned with understanding the rates of chemical reactions (chemical reaction). It is to be contrasted with thermodynamics, which deals with the direction in which a… …
83Kepler conjecture — In mathematics, the Kepler conjecture is a conjecture about sphere packing in three dimensional Euclidean space. It says that no arrangement of equally sized spheres filling space has a greater average density than that of the cubic close packing …
84SahysMod — is a computer program for the prediction of the salinity of soil moisture, groundwater and drainage water, the depth of the water table, and the drain discharge in irrigated agricultural lands, using different hydrogeologic (aquifer) conditions,… …
85nebula — nebular, adj. /neb yeuh leuh/, n., pl. nebulae / lee , luy /, nebulas. 1. Astron. a. Also called diffuse nebula. a cloud of interstellar gas and dust. Cf. dark nebula, emission nebula, reflection nebula …
86Chemical plant — BASF Chemical Plant Portsmouth Site in the West Norfolk area of Portsmouth, Virginia, United States. The plant is served by the Commonwealth Railway …
87Artillery — For other uses of the term, see Artillery (disambiguation). Warfare Military history Eras Prehistoric Ancient …
88QCD matter — Quark matter or QCD matter (see QCD) refers to any of a number of theorized phases of matter whose degrees of freedom include quarks and gluons. These theoretical phases would occur at extremely high temperatures and densities, billions of times… …
89List of Guggenheim Fellowships awarded in 2007 — 2007 U.S. and Canadian Fellows= * Daniel Alarcón, Writer, Oakland, Califorcnia; Distinguished Visiting Writer, Mills College: Fiction. * Rick Altman, Professor of Cinema and Comparative Literature, University of Iowa: Classical Hollywood sound. * …
90four-colour map problem — In topology, a long standing conjecture asserting that no more than four colours are required to shade in any map such that each adjacent region is coloured differently. First posed in 1852 by Francis Guthrie, a British math student, it was… …
