length-depth ratio

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• Focal length — The focal length of an optical system is a measure of how strongly it converges (focuses) or diverges (diffuses) light. A system with a shorter focal length has greater optical power than one with a long focal length. Thin lens approximation For… …   Wikipedia

• thickness/chord ratio — The ratio between the maximum thickness or depth of an airfoil section and its chord length, expressed as a percentage of the chord length …   Aviation dictionary

• river — river1 riverless, adj. riverlike, adj. /riv euhr/, n. 1. a natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels. 2. a similar stream of something other than water: a… …   Universalium

• Dal Lake — For the lake in Kangra district (Himachal Pradesh), see Dal Lake (Himachal Pradesh). Dal Lake डल झील Dal Lake and the shikaras Location Srinagar …   Wikipedia

• Impulse excitation technique — PracticalThe impulse excitation technique is a nondestructive test method that uses natural frequency, dimensions and mass of a test piece to determine Young s modulus, Shear modulus, Poisson s ratio and damping coefficient.Dimensions and mass of …   Wikipedia

• Lake Shikotsu — infobox lake lake name = Lake Shikotsu 支笏湖 image lake = Shikotsuko1.jpg caption lake = image bathymetry = caption bathymetry = coords = coord|42|48|N|141|21|E|region:JP type:waterbody|display=inline,title type = crater lake inflow = Bifue,… …   Wikipedia

• Battle of the Little Bighorn — Coordinates: 45°33′54″N 107°25′44″W / 45.565°N 107.42889°W / 45.565; 107.42889 …   Wikipedia

• Hyperfocal distance — In optics and photography, hyperfocal distance is a distance beyond which all objects can be brought into an acceptable focus. There are two commonly used definitions of hyperfocal distance , leading to values that differ only slightly:The first… …   Wikipedia

• Gear — For the gear like device used to drive a roller chain, see Sprocket. This article is about mechanical gears. For other uses, see Gear (disambiguation). Two meshing gears transmitting rotational motion. Note that the smaller gear is rotating… …   Wikipedia

• Earth 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… …   Universalium