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double plane annulus

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  • Problem of Apollonius — In Euclidean plane geometry, Apollonius problem is to construct circles that are tangent to three given circles in a plane (Figure 1); two circles are tangent if they touch at a single point. Apollonius of Perga (ca. 262 BC ndash; ca. 190 BC)… …   Wikipedia

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  • ear, human — ▪ anatomy Introduction       organ of hearing and equilibrium that detects and analyzes noises by transduction (or the conversion of sound waves into electrochemical impulses) and maintains the sense of balance (equilibrium).  The human ear, like …   Universalium

  • Orbifold — This terminology should not be blamed on me. It was obtained by a democratic process in my course of 1976 77. An orbifold is something with many folds; unfortunately, the word “manifold” already has a different definition. I tried “foldamani”,… …   Wikipedia

  • Torus — Not to be confused with Taurus (disambiguation). This article is about the surface and mathematical concept of a torus. For other uses, see Torus (disambiguation). A torus As the distance to th …   Wikipedia

  • Refractive index — Refraction of light at the interface between two media. In optics the refractive index or index of refraction of a substance or medium is a measure of the speed of light in that medium. It is expressed as a ratio of the speed of light in vacuum… …   Wikipedia

  • mercury — /merr kyeuh ree/, n., pl. mercuries. 1. Chem. a heavy, silver white, highly toxic metallic element, the only one that is liquid at room temperature; quicksilver: used in barometers, thermometers, pesticides, pharmaceutical preparations,… …   Universalium

  • Dispersion staining — Contents 1 Dispersion Staining 1.1 Becke Line Dispersion Staining 1.2 Oblique Illumination Dispersion Staining 1.3 Darkfield Illumination Dispersion Staining …   Wikipedia

  • Aortic dissection — Classification and external resources Dissection of the aorta descendens (3), which starts from the left subclavian artery, reaching to the abdominal aorta (4). Aorta ascendens (1) and aortic arch (2) are not involved …   Wikipedia

  • Electric Line — The term wireline usually refers to a cabling technology used by operators of oil and gas wells to lower equipment or measurement devices into the well for the purposes of well intervention and reservoir evaluation. Braided line can contain an… …   Wikipedia

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