critical dimensions
71Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
72Anthropic principle — In astrophysics and cosmology, the anthropic principle is the philosophical argument that observations of the physical Universe must be compatible with the conscious life that observes it. Some proponents of the argument reason that it explains… …
73Quantum dot — Part of a series of articles on Nanomaterials Fullerenes …
74Universal pragmatics — Universal pragmatics, more recently placed under the heading of formal pragmatics, is the philosophical study of the necessary conditions for reaching an understanding through communication. The philosopher Jürgen Habermas coined the term in his… …
75Stationary point — Not to be confused with a fixed point where x = f(x). Stationary points (red pluses) and inflection points (green circles). The stationary points in this graph are all relative maxima or relative minima. In mathematics, particularly in calculus,… …
76steel — steellike, adj. /steel/, n. 1. any of various modified forms of iron, artificially produced, having a carbon content less than that of pig iron and more than that of wrought iron, and having qualities of hardness, elasticity, and strength varying …
77North American P-51 variants — Main article: North American P 51 Mustang Further information: North American A 36, F 82 Twin Mustang The North American P 51 Mustang was an American long range single seat fighter aircraft that entered service with Allied air forces in the… …
78Loudspeaker — For other uses, see Loudspeaker (disambiguation). An inexpensive, low fidelity 3½ inch speaker, typically found in small radios …
79Directed percolation — In statistical physics Directed Percolation (DP) refers to a class of models that mimic filtering of fluids through porous materials along a given direction. Varying the microscopic connectivity of the pores, these models display a phase… …
80ship construction — Introduction complex of activities concerned with the design and fabrication of all marine vehicles (ship). Ship construction today is a complicated compound of art and science. In the great days of sail, vessels were designed and… …
