surface acoustic wave!

surface acoustic wave

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1) "Surface" -- As to surface acoustic wave 1sur·face Pronunciation: 's&r-f&s Function: noun Etymology: French, from Middle French, from sur- + face face, from Old French -- more at FACE 1 : the exterior or upper boundary of an object or body <on the surface of the water> <the earth's surface> 2 : a plane or curved two-dimensional locus of points (as the boundary of a three-dimensional region) <plane surface> <surface of a sphere> 3 a : the external or superficial aspect of something <trouble lurks below the surface> b : an external part or layer <sanded the rough surfaces> - on the surface : to all outward appearances Pronunciation Symbols An open surface with X-, Y-, and Z-contours shown. In mathematics, specifically in topology, a surface is a two-dimensional manifold. The most familiar examples are those that arise as the boundaries of solid objects in ordinary three-dimensional Euclidean space, E3. On the other hand, there are also more exotic surfaces, that are so "contorted" that they cannot be embedded in three-dimensional space at all. To say that a surface is "two-dimensional" means that, about each point, there is a coordinate patch on which a two-dimensional coordinate system is defined. For example, the surface of the Earth is (ideally) a two-dimensional sphere, and latitude and longitude provide coordinates on it — except at the International Date Line and the poles, where longitude is undefined. This example illustrates that in general it is not possible to extend any one coordinate patch to the entire surface; surfaces, like manifolds of all dimensions, are usually constructed by patching together multiple coordinate systems. Surfaces find application in physics, engineering, computer graphics, and many other disciplines, primarily when they represent the surfaces of physical objects. For example, in analyzing the aerodynamic properties of an airplane, the central consideration is the flow of air along its surface. 1 Definitions and first examples 2 Extrinsically defined surfaces and embeddings 3 Construction from polygons 4 Quotients and connected summation 5 Classification of closed surfaces 6 Surfaces in differential geometry 7 Surfaces in complex and algebraic geometry 8 See also 9 References 10 External links A (topological) surface with boundary is a Hausdorff topological space in which every point has an ope..." 2) "Acoustic" -- As to surface acoustic wave acous·tic Pronunciation: &-'küs-tik Variant(s): or acous·ti·cal /-ti-k&l/ Function: adjective Etymology: Greek akoustikos of hearing, from akouein to hear -- more at HEAR 1 : of or relating to the sense or organs of hearing, to sound, or to the science of sounds <acoustic apparatus of the ear> <acoustic energy>: as a : deadening or absorbing sound <acoustic tile> b : operated by or utilizing sound waves 2 : of, relating to, or being a musical instrument whose sound is not electronically modified - acous·ti·cal·ly /-k(&-)lE/ adverb Pronunciation Symbols Acoustic may refer to: In science: Acoustics, a branch of physics that studies sound Musical acoustics, the branch of acoustics that studies the physics of music Acoustic meatus, another name for the ear canal In music: Acoustic instrument, as opposed to an electric instrument Acoustic music, music that solely or primarily uses acoustic instruments Acoustic guitar, as opposed to electric guitar Acoustic bass guitar, as opposed to electric bass guitar Acoustic (Deine Lakaien album), 1995 Acoustic (John Lennon album), 2004 Acoustic Americana, a record label Acoustic Disc, a record label Other: Acoustic Control Corporation, a company which produced instrument amplifiers using Acoustic as a brand name Acoustic thermometry, observation of the oceans' climates using long-range acoustic instruments Acoustic cryptanalysis, in cryptography, a side channel attack which exploits sounds Piano acoustics Acoustic fingerprint Acoustic torpedo ..." 3) "Wave" -- As to surface acoustic wave 1wave Pronunciation: 'wAv Function: verb Inflected Form(s): waved; wav·ing Etymology: Middle English, from Old English wafian to wave with the hands; akin to Old English wæfan to clothe and perhaps to Old English wefan to weave intransitive verb 1 : to motion with the hands or with something held in them in signal or salute 2 : to float, play, or shake in an air current : move loosely to and fro : FLUTTER <flags waving in the breeze> 3 of water : to move in waves : HEAVE 4 : to become moved or brandished to and fro <signs waved in the crowd> 5 : to move before the wind with a wavelike motion <field of waving grain> 6 : to follow a curving line or take a wavy form : UNDULATE transitive verb 1 : to swing (something) back and forth or up and down 2 : to impart a curving or undulating shape to <waved her hair> 3 a : to motion to (someone) to go in an indicated direction or to stop : SIGNAL <waved down a passing car> b : to gesture with (the hand or an object) in greeting or farewell or in homage c : to dismiss or put out of mind : DISREGARD -- usually used with aside or off d : to convey by waving <waved farewell> 4 : BRANDISH, FLOURISH <waved a pistol menacingly> synonym see SWING Pronunciation Symbols It has been suggested that this article be split into articles entitled wave, accessible from a disambiguation page. (Discuss) A wave is a disturbance that propagates through space or spacetime, often transferring energy. While a mechanical wave exists in a medium (which on deformation is capable of producing elastic restoring forces), waves of electromagnetic radiation (and probably gravitational radiation) can travel through vacuum, that is, without a medium. Waves travel and transfer energy from one point to another, often with little or no permanent displacement of the particles of the medium (i.e. little or no associated mass transport); instead there are oscillations around almost fixed positions. 1 Characteristics 1.1 Polarization 1.2 Examples 2 Mathematical description 2.1 The wave equation 2.2 Traveling waves 2.3 Propagation through strings 3 Transmission medium 4 See also 5 Further reading 6 External links Surface waves in water Periodic waves are characterized by crests (highs) and troughs (lows), and may usually be categorized as either longitudinal or transverse. Transverse waves are those with vibrations perpendicular to the direction of the propagation of the wave; examples include waves on a string and electromagnetic waves. Longitudinal waves are those with vibrations parallel to the direction of the propagation of the wave; examples include most sound waves. When an object bobs up and down on a ripple in a pond, it experiences an orbital trajectory because ripples are not simple transverse sinusoidal waves. A = At deep water. B = At shallow water. The circular movement of a surface particle becomes elli..." 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