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Topic: Wave propagation

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	Aerodynamics, Acoustics, Shock Waves Propagation
		Radiation of waves from a source occur at a characteristic speed (speed of sound), that is a function of the thermodynamic properties of the air.
		Wave propagation is limited by the walls, and is generally one-dimensional (except for those cases in which the walls interact elastically with the waves).
		Acoustic waves propagate at a constant speed, and the flow of acoustic energy is independent of the duct section (contrary to the progagation of a blast).
	www.aerodyn.org /HighSpeed/waves.html (865 words)

	Wave equation - Wikipedia, the free encyclopedia
		The wave equation is an important partial differential equation which generally describes all kinds of waves, such as sound waves, light waves and water waves.
		The basic wave equation is a linear differential equation which means that the amplitude of two waves interacting is simply the sum of the waves.
		The elastic wave equation in three dimensions describes the propagation of waves in an isotropic homogeneous elastic medium.
	en.wikipedia.org /wiki/Wave_equation (859 words)

	[No title]
		Gravity waves play an important role for the transportation of momentum and energy from the lower atmosphere to the middle atmosphere, and thus significently influence on the temperature structure and global-scale circulation in this region.
		When the gravity waves propagate through the airglow layers, the perturbations of density are introduced, and variations on the visible and near-infrared emission intensity for certain species can be dectected from ground.
		We studied the seasonal dependence of gravity wave occurrence frequency and found that the average frequecny was over 90% based on the 13 month OH images taken in Plantteville, CO with almost 100% occurrence frequency in summer and ~85% in other seasons.
	www.colorado-research.com /~biff/OHwavedirection/OHwavedirection.html (1829 words)

	Ham-Shack.com : Radio-Wave Propagation (Site not responding. Last check: 2007-09-16)
		Propagation is the study of how radio waves travel from one point to another, and can be a fascinating part of ham radio.
		Slight bending of radio waves occur in the troposphere, causing signals to return to Earth beyond the geometric horizon, and allows you to contact stations that are farther away than would otherwise be possible.
		The higher the frequency of the radio wave, the less it is bent by the ionosphere.
	www.ham-shack.com /propagation.html (1516 words)

	Wave Properties
		Wave characteristics and particle motions of these wave types can be easily illustrated using the seismic wave animations.
		P and S waves are often called body waves because they propagate outward in all directions from a source (such as an earthquake) and travel through the interior of the Earth.
		Love waves are dispersive, that is, the wave velocity is dependent on frequency, generally with low frequencies propagating at higher velocity.
	www.tjhsst.edu /~jlafever/wanimate/Wave_Properties2.html (740 words)

	Aerodynamics, Acoustics, Shock Waves Propagation
		Radiation of waves from a source occur at a characteristic speed (speed of sound), that is a function of the thermodynamic properties of the air.
		Wave propagation is limited by the walls, and is generally one-dimensional (except for those cases in which the walls interact elastically with the waves).
		Acoustic waves propagate at a constant speed, and the flow of acoustic energy is independent of the duct section (contrary to the progagation of a blast).
	aerodyn.org /HighSpeed/waves.html (865 words)

	WAVE PROPAGATION
		This attitude undoubtedly stems from the fact that wave propagation is an invisible force that cannot be detected by the sense of sight or touch.
		Understanding wave propagation requires the use of the imagination to visualize the associated concepts and how they are used in practical application.
		Wave motion, therefore, is a means of moving or transferring energy from one point to another point.
	www.tpub.com /neets/book10/39.htm (1494 words)

	Modes of Sound Wave Propagation
		Waves can be characterized in space by oscillatory patterns that are capable of maintaining their shape and propagating in a stable manner.
		Wave motion in the symmetrical mode is most efficiently produced when the exciting force is parallel to the plate.
		The asymmetrical Lamb wave mode is often called the “flexural mode” because a large portion of the motion moves in a normal direction to the plate, and a little motion occurs in the direction parallel to the plate.
	www.ndt-ed.org /EducationResources/CommunityCollege/Ultrasonics/Physics/modepropagation.htm (514 words)

	Wave Propagation Group
		The Wave Propagation Group was established simultaneously with the foundation of the Institute of Applied and Computational Mathematics in 1985.
		In 2000 a hydroacoustic measurement facility was established at IACM which enables the conduction of scaled propagation experiments, the calibration of acoustic transducers, and the performance of acoustic field measurements in the audible and ultrasound regime.
		Today, besides underwater acoustics, it includes the theory of elastic wave propagation, water waves, and the theoretical and numerical study of non-linear wave phenomena in fluid dynamics, kinetic theory of gases and models from material science.
	www.iacm.forth.gr /wave (145 words)

	BWCM - E&M - EM Wave Propagation
		The propagation speed of phase velocity, Vphi, is dependent only on the constants Uo and Epsilon_o and is given by 1/sqrt(Epsilon_o*Uo) in meters per second (go ahead, try calculating it from the values for Epsilon_o and Uo given earlier!).
		Since EM waves carry energy, and energy must be conserved, this must mean that the energy per area must go down with the square of distance, at least when far away from the transmitting antenna, where the characteristcs of the wave are no longer dependent on the geometry of the antenna.
		When the wavelength of the EM wave becomes longer than a certain fraction of the earth's radius (few hundredths of a percent of the radius) a modified form of line of sight can occur, in which a portion of the EM wave is bent around the horizon.
	www.rocket-roar.com /BWCM/em/wave.html (2031 words)

	radio wave propagation (Site not responding. Last check: 2007-09-16)
		Short wave radio signals (radio signals which fall in the range of 3 to 30 MHz) are reflected from this layer just as light rays are reflected from the surface of a mirror, or sound wave from a barrier.
		Radio waves are commonly refracted when they travel through different layers of the atmosphere, whether it is highly charged ionospheric layers 100 km and higher, or weather-sensitive area near the Earth surface.
		The problem of variable propagation conditions can be partially overcome by using frequency diversity, in which an allotted wireless communication network is provided with several frequency assignments spanning the high frequency (short wave) band of frequencies.
	www.vigyanprasar.com /ham/IONOS.htm (2383 words)

	[No title]
		Love waves are dispersive, that is, the wave velocity is dependent on frequency, generally with low frequencies propagating at higher velocity.
		The surface waves extend over a long time interval because surface wave propagation is dispersive (the velocity of propagation is dependent on the frequency of the wave).
		The first shear wave motion (illustrated in the particle motion diagram in the lower left of Figure 9) is arriving from down and to the south (diagonally from the lower left in the particle motion diagram).
	web.ics.purdue.edu /~braile/edumod/waves/WaveDemo.htm (4491 words)

	Wave Propagation
		In longitudinal waves, the oscillations occur in the longitudinal direction or the direction of wave propagation.
		Compression waves can be generated in liquids, as well as solids because the energy travels through the atomic structure by a series of comparison and expansion (rarefaction) movements.
		Shear waves require an acoustically solid material for effective propagation, and therefore, are not effectively propagated in materials such as liquids or gasses.
	www.ndt-ed.org /EducationResources/CommunityCollege/Ultrasonics/Physics/wavepropagation.htm (397 words)

	Wave Propagation (Site not responding. Last check: 2007-09-16)
		The velocity of a wave traveling in a string depends inversely on the root of the string's linear mass density in much the same way as the velocity of light traveling in a dielectric depends inversely on the root of the dielectric's relative permittivity (the root of the relative permittivity is the refractive index).
		A wave passing a reference plane on a string can be described by its displacement and slope in the same way that a light ray is described.
		The connection between waves in quantum mechanics and waves on a string is direct because the boundary conditions are identical.
	www.kw.igs.net /~jackord/ee/e3.html (363 words)

	Wave propagation parallel to the magnetic field
		It is, therefore, not surprising that right-handed waves, propagating parallel to the equilibrium magnetic field, and oscillating at the frequency
		The dispersion curve for a right-handed wave propagating parallel to the equilibrium magnetic field is sketched in Fig.
		Whistler waves are a very characteristic type of audio-frequency radio interference, most commonly encountered at high latitudes, which take the form of brief, intermittent pulses, starting at high frequencies, and rapidly descending in pitch.
	farside.ph.utexas.edu /teaching/plasma/lectures/node50.html (858 words)

	Home 2
		Acoustic propagation in the water columns over elastic boundaries is studied experimentally both in the laboratory and in the ocean, and is analysed theoretically.
		The emphasis of the book is on the active control of waves in structures, the active isolation of vibrations, the use of distributed strain actuators and sensors, and the active control of structurally radiated sound.
		Propagation of sound in various kinds and shapes of pipes, horns and other acoustic components is discussed.
	www.iiav.org /books1.htm (10096 words)

	Geostrophic Wave Circulations
		The propagation of Rossby wave on a sphere was studied by Hoskins and Karoly (1981) and Karoly and Hoskins (1982) using the ray-tracing theory.
		Although the large-scale perturbations in the extratropical atmosphere are represented by Rossby waves and the fluxes may be evaluated analytically from the wave solutions, the results obtained cannot explain the major features of the perturbations, the eddy transport processes and the forced mean meridional circulations.
		Usually, the stationary wave amplitudes increase with height in the troposphere and the external forcings weaken upward, so the forced stationary waves may produce a residual amount of heat or momentum which may not be compensated by external forcings at the high levels.
	wave.prohosting.com /nkpub/Introduction.html (1832 words)

	Wave Propagation
		Both sine waves and EM waves would be useful and when in step with a spherical wave would be an effective organiser of space and matter, and able to exchange energy effectivly betwwen them.
		Electromagnetic waves do not need a medium simply because they are mathematical 'waves' not real waves (but then mathematics needs a connecting medium, ultimately all things need a continuously connected medium to explain logic and senses).
		Space is rigid, but waves flow through space and provide the means by which everything is connected, and energy as a medium for wave propagation maintains this connection at all times as it is not seperate like a particle is in standard wave propagation model of physics.
	www.physics-philosophy-metaphysics.com /forum/wave-propagation-vt480.html (6255 words)

	VE3BMV Conductive Propagation Theory (Site not responding. Last check: 2007-09-16)
		The present radio wave propagation theory is based on the assumption that radio waves are propagated by reflections from a mirror-like ionosphere, returning to the earth's surface, bouncing off it back to the ionosphere and so on.
		The geometry of propagation is dependent on the frequency used and the condition of the atmosphere.
		propagation probably due to the fact that the orientation of borders of the media with different dielectric constants are oriented horizontally, enhancing the refraction of horizontally polarized signals.
	members.aol.com /ve3bmv/bmvpropagation.htm (4858 words)

	Plane Wave Propagation
		The plane wave propagation simulation is used to show that the solvers can resolve a simple plane wave and it is used to measure the accuracy of the solvers.
		The plane wave is set as the initial solution on a periodic domain (shown in Figure 4.1) and the solver is ran for one light transit time.
		The propagation of the wave with the rectangular upwind solver is shown in Figure 4.2 and demonstrates that the wave does propagate properly to the left.
	www.aa.washington.edu /cfdlab/docs/aberle-thesis/node48.html (851 words)

	Radio-Electronics.Com :: Ground Wave Radio Propagation
		Ground wave propagation is particularly important on the LF and MF portion of the radio spectrum.
		Ground wave propagation is used to provide relatively local coverage, especially by radio broadcast stations that require to cover a particular locality.
		Sky-wave ionospheric propagation is not possible during the day because of the attenuation of the signals on these frequencies caused by the D region in the ionosphere.
	www.radio-electronics.com /info/propagation/ground_wave/ground_wave.php (929 words)

	Basics of Radio Wave Propagation
		For propagation along the direction of the magnetic field, it is the mode in which the electric vector rotates in the same sense that an electron gyrates freely about the field.
		A wave disturbance (also known as a flare blast wave) generated by large flares, which is seen to propagate horizontally across the disk of the sun at a typical velocity of about 1000 km /s.
		For propagation along the direction of the magnetic field, it is the mode in which the electric vector rotates opposite to the direction of an electron gyrating freely about the field.
	ecjones.org /propag.html (16958 words)

	Wave propagation through an inhomogeneous plasma
		Recall, that when a propagating wave is normally incident on an interface, where the refractive index suddenly changes (for instance, when a light wave propagating through air is normally incident on a glass slab), there is generally significant reflection of the wave.
		However, according to the WKB solutions, (545)-(546), when a propagating wave is normally incident on a medium in which the refractive index changes slowly along the direction of propagation of the wave, then the wave is not reflected at all.
		In reality, a wave propagating into a medium in which the refractive index is a slowly varying function of position is subject to a small amount of reflection.
	farside.ph.utexas.edu /teaching/plasma/lectures/node52.html (816 words)

	Agilent \| Wave Propagation along a Transmission Line
		When a sine wave from an RF signal generator is placed on a transmission line, the signal propagates toward the load.
		If it were possible to measure just the reflected wave, we would see that its amplitude does not vary with position along the line.
		The sine wave at point z4 would also be of constant amplitude, but its amplitude would differ from that of the signal at point z6.
	education.tm.agilent.com /index.cgi?CONTENT_ID=6 (575 words)

	Simple Wave Animations - J. Barker
		In this case, the refracted wave in the lower medium is clear, the head wave can be seen to develop with a cross-over distance of about 120 km.
		The linearity of the head wave as it propagates upward is particularly well illustrated by the animation.
		There is a weak numerical artifact (which appears as a wave propagating up from the bottom of the image) due to not-quite absorbing boundary conditions.
	www.geol.binghamton.edu /faculty/barker/animations.html (740 words)

	Wave Propagation in Urban Microcells: a Massively Parallel Approach Using the TLM Method (ResearchIndex) (Site not responding. Last check: 2007-09-16)
		Wave Propagation in Urban Microcells: a Massively Parallel Approach Using the TLM Method
		2 dimensional wave equation (context) - Hrgovci'c, of - 1991
		1 The wave automaton for the time-dependent schroedinger (context) - Sornette, Legrand et al.
	citeseer.ist.psu.edu /45094.html (400 words)

	Davis, J.L.: Mathematics of Wave Propagation.
		Waves are everywhere, and the propagation and classical properties of these apparently disparate phenomena can be described by the same mathematical methods: variational calculus, characteristics theory, and caustics.
		The result is a clear and unified treatment of wave propagation that makes a diverse body of mathematics accessible to engineers, physicists, and applied mathematicians engaged in research on elasticity, aerodynamics, and fluid mechanics.
		By proceeding from concrete phenomena (e.g., the Doppler effect, the motion of sinusoidal waves, energy dissipation in viscous fluids, thermal stress) rather than abstract mathematical principles, Davis also creates a one-stop reference that will be prized by students of continuum mechanics and by mathematicians needing information on the physics of waves.
	pup.princeton.edu /titles/6884.html (283 words)

	Agilent Technologies \| Educator's Corner - Resource Guide for Engineering Educators \| Wave Propagation along a ...
		When a sine wave from an RF signal generator is placed on a transmission line, the signal propagates toward the load.
		But the amplitude of the resultant waveform, indicated by the standing wave (green), is not constant along the entire line because the transmitted and reflected signals (yellow and blue) combine.
		The sine wave at point z4 would also be of constant amplitude, but its amplitude would differ from that of the signal at point z6.
	www.educatorscorner.com /index.cgi?CONTENT_ID=2483 (596 words)

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