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# Topic: Phase (waves)

###### In the News (Tue 20 Aug 19)

 Phase Definitions Calendar If the two in-phase waves A and B are added together (for instance, if they are two light waves shining on the same spot), the result will be a third wave of the same wavelength as A and B, but with twice the amplitude. The wave function is complex and since its square modulus is associated to probability of observing the object, the complex character of the wave function is associated to the phase. It is common to speak of inverting the polarity of a wave as "flipping the phase" or "shifting the phase by 180 degrees". www.phase.name   (915 words)

 Processing 1.0 _ALPHA_ - rotating a sine wave? As you can see, the sine wave is following the inclined path; but it's crests are aligned to a horizontal normal. I can't draw the sine and apply a rotateZ command, since this is a part of a bigger code... the normalizing is the place where I got stuck before; I have this project ready, but the sine waves were not aligned to the normals... www.processing.org /discourse/yabb/YaBB.cgi?board=Contributions_Beyond;action=display;num=1112719128   (728 words)

 Nikon MicroscopyU: Interactive Java Tutorials - Interaction of Light Waves with Phase Specimens Upon encountering a phase specimen, an incident illumination wavefront is deformed according to the geometry, refractive index, and thickness of the specimen. Incident light that is scattered by non-absorbing, transparent phase specimens is retarded in phase by one-quarter wavelength relative to those light waves that do not interact directly with atoms and molecules comprising the specimen. When an electromagnetic wave (such as that comprising in an incident light wave) interacts with an atom or molecule, electrons are translocated in an oscillatory fashion in response to the changing electric field of the wave. www.microscopyu.com /tutorials/java/phasecontrast/phasespecimens   (1111 words)

 The world's top phase waves websites For a wave it thus relates the position of a feature, typically a peak or a trough of the waveform, to that same feature in another part of the waveform (or, which amounts to the same, on a second waveform). If the two in-phase waves A and B are added together (for instance, if they are two light waves shining on the same spot), the result will be a third wave of the same wavelength as A and B, but with twice the amplitude. The wave function is complex and since its square modulus is associated to probability of observing the object, the complex character of the wave function is associated to the phase. www.websbiggest.com /wiki-article-tab.cfm/phase__waves_   (674 words)

 Phase Information - moon phase The wave function is complex and since moon phase calender its square modulus is associated to probability of just a phase observing moon phase calendar the object, the complex character of the wave function is associated to the phase. Since the complex algebra phase 1 is responsible phase of the moon for the striking interference effect of quantum mechanics, phase 1 environmental assessment phase of particles is phase 1 environmental report therefore ultimately 3 phase converters related to their 3 phase motor wiring quantum behavior. It is common to speak of inverting the polarity of a wave as "flipping the phase" or "shifting the phase by 180 degrees". www.inanot.com /Ina-Electronics_Topics_O_-_Ph-/Phase.html   (815 words)

 Waves and Sound Resources Transverse Wave - the particles of the medium vibrate in a direction that is perpendicular to the direction of the wave itself. The greater the amplitude of the wave, the greater the amount of energy carried by the wave. A Standing Wave (fl) is produced by the interference of two periodic waves of the same amplitude and wavelength (red and blue) traveling in opposite directions. www.lewport.wnyric.org /mgagnon/wavesound.html   (629 words)

 Phase (waves) - Wikipedia, the free encyclopedia Waves are amplitudes that change cyclically, often modeled as sinusoidal functions of time (t) or some other variable. Two waves that have the same frequency and different initial phases, have a phase difference that is constant (independent of t). The wave function is complex and since its square modulus is associated to probability of observing the object, the complex character of the wave function is associated to the phase. en.wikipedia.org /wiki/Phase_(waves)   (836 words)

 Waves Unit Outline Surface waves, like those found in oceans and large lakes, are a combination of transverse and longitudinal waves in that the particles move both perpendicular and parallel to the wave. Amplitude is the height of a transverse wave or the crowdedness of the compression in a longitudinal wave. A transverse waves move the medium at right angles to the direction in which the waves are traveling, while a longitudinal wave moves particles of the medium parallel to the direction in which the waves are traveling. www.msu.edu /~hawkin79/ScienceSystems/Unitoutlines/Waves.htm   (884 words)

 Physics Today August 2001 An initial guess of the wave's phase is made and, with the known intensity, Fourier-transformed to obtain the corresponding far-field diffraction pattern. With certain caveats concerning phase vortices (see box 1), the transport-of-intensity equation may be solved uniquely for the phase in a plane given measurements of the intensity in that plane together with the intensity derivative normal to that plane. Phase imaging is of widespread importance in microscopy. www.physicstoday.org /pt/vol-54/iss-8/p27.html   (2843 words)

 Oilfield Glossary: Term 'phase' A description of the motion of, or means of comparison of, periodic waves such as seismic waves. Waves that have the same shape, symmetry and frequency and that reach maximum and minimum values simultaneously are in phase. Waves that are not in phase are typically described by the angular difference between them, such as, "180 degrees out of phase." Zero-phase wavelets are symmetrical in shape about zero time whereas non-zero-phase wavelets are asymmetrical. www.glossary.oilfield.slb.com /Display.cfm?Term=phase   (162 words)

 TEW--The Theory of Elementary Waves Indeed, by reciprocity, the intensity of the wave reaching the source from a point on the screen is identical to the intensity of the usual forward moving quantum wave reaching that point on the screen, assuming identical intensity upon emission. I have spoken of the reverse waves as being `emitted' by the detector. Wave entanglements are generally viewed as being essential to the description of identical particle phenomena and to the entire structure of quantum mechanics; so it may strike the reader as absurd to try to account for multi-particle effects without them. www.yankee.us.com /TEW/TEW96paper.html   (21338 words)

 Pattern formation and traveling waves in myxobacteria: Theory and modeling -- Igoshin et al. 98 (26): 14913 -- ... Those cells in the incoming wave that are in their refractory period continue to pass through, whereas those in their sensitive period may reverse on collision with counter-moving cells. There is also a third, somewhat longer, period when there are counterpropagating waves because of cells that alternate between the two wave trains, seen in the broader and higher second peak in the experimental histogram (see figure 7 of ref. 10). The tilt in the waves is caused by the density gradient between the proximal (Top) and peripheral (Bottom) regions of the colony, which causes a slow drift of individuals outward, bringing with it cells with retarded phases. www.pnas.org /cgi/content/full/98/26/14913   (3932 words)

 Mad Science It is not correct to say that "the waves in laser light are all in phase." When two light waves combine, they inextricably add together to form a new wave, they do not travel as two independent "in-phase" waves. When the light wave within a laser causes atoms to emit smaller, in- phase light waves, the result is not "in phase" light. Single waves are always in phase with themselves, but it's misleading to imply that a single wave is something called an "in phase" wave. indianink.net /Members/madscience/madscience.html   (442 words)

 wave, in physics: Parameters of Waves The frequency of the wave is equal to the number of crests (or troughs) that pass a given fixed point per unit of time. The frequency of a wave is the inverse of the period. The various parts of a cycle are described by the phase of the wave; all waves are referenced to an imaginary synchronous motion in a circle; thus the phase is measured in angular degrees, one complete cycle being 360°. www.infoplease.com /ce6/sci/A0861897.html   (397 words)

 Wave Mechanics; Animated de Broglie phase wave   (Site not responding. Last check: 2007-10-26) Note that this is for the purpose of illustrating the instantaneous phase of the internal periodic phenomenon only; it is not intended to convey that the particle is literally moving up-and-down. Note that, in accordance with the de Broglie theory, the phase of the phase wave at the position of the particle always exactly matches the instantaneous phase of the internal periodic phenomenon associated with the particle, though (except for massless particles) the particle and the phase wave move, or propagate, with different velocities. The constant match between the phase of the phase wave and the phase of the internal periodic phenomenon at the position of the particle is illustrated above by the invariable coincidence of the www.davis-inc.com /physics/wavegrph.html   (398 words)

 The phase structure of very low latitude ULF waves across dawn Ultralow frequency (ULF) waves at the geomagnetic equator are studied by using a small magnetometer array and a one-dimensional electromagnetic wave model. A model of ULF wave propagation through the equatorial ionosphere is presented and used to compare with the observed amplitude and phase properties. It is shown that the observed frequencies are in the vicinity of the wave cutoff frequency where the phase structure becomes complicated. www.agu.org /pubs/crossref/2001/2000JA000339.shtml   (381 words)

 Superposition of Waves Two waves (with the same amplitude, frequency, and wavelength) are travelling in the same direction on a string. The phase difference between the two waves varies increases with time so that the effects of both constructive and destructive interference may be seen. If two sinusoidal waves having the same frequency (wavelength) and the same amplitude are travelling in opposite directions in the same medium then, using superposition, the net displacement of the medium is the sum of the two waves. www.kettering.edu /~drussell/Demos/superposition/superposition.html   (776 words)

 Sine Waves in Phase To be in phase, the two sine waves must go through their maximum and minimum points at the same time and in the same direction. Thus, two sine waves that differ in phase by 45° are actually out of phase with each other, whereas two sine waves that differ in phase by 360° are considered to be in phase with each other. The wave that crosses the axis at the later time (to the right on the time axis) is said to lag the other wave. www.tpub.com /neets/book2/1g.htm   (629 words)

 Daqarta for DOS: Miscellaneous IV Phase is the measure of the starting point of one sinusoid relative to another. The sine and cosine components are often referred to as the "in-phase" and "quadrature" components, especially in discussions of older analog methods. Although a perfect square wave requires an infinite number of harmonics, it should be clear that if you extended this process you could approximate one to any desired degree of precision. www.daqarta.com /0msssine.htm   (2053 words)

 Interference of Light In phase: particles in the same wave train are in phase if, at any and all times, they are always displaced from the rest position by the same amount and direction. When waves are neither in or out of phase, they must interfere and combine to form a composite wave with amplitude R. Their vibrational vectors add vectorially where they coincide in time and space. The form of the resultant wave depends on the wavelengths of the two original waves, their amplitudes, and their path difference. ijolite.geology.uiuc.edu /98FallClass/geo332/1019   (889 words)

 Coherence - The Biocybernaut Institute - About / Brain Waves / Coherence Coherence is the condition of synchrony between the waves generated in different regions or hemispheres of the brain. (Coherence is having waves in phase and of one wavelength) It is too much to ask that Brain Waves be at exactly the same frequency and exactly the same phase angle. www.biocybernaut.com /about/brainwaves/coherence.htm   (159 words)

 Phase - Wikipedia, the free encyclopedia Phase shift or phasing - relative phase shift in superposing waves In a complex system, a phase is a behaviour that emerges from the interactions of components at a smaller scale. Phasing, A process of interpretive and excavation techniques of associating archaeological contexts to produce near contemporaneous horizons in the archaeological sequence of a site. en.wikipedia.org /wiki/Phase   (509 words)

 sound waves - aworks search engine swicki - powered by eurekster The "waves" of Wavemaker were to be long seq... The nature of sound as a longitudinal, mechanical pressure wave is explained and... Wave principles of resonance and standing waves are applied in an... aworks-search-engine-swicki.eurekster.com /sound+waves   (332 words)

 Plasma Physics and Astrophysics Research Papers and Proposals Furthermore, as a new aspect concerning the interaction of radiation with atoms, the effect of a finite wave field strength (compared to the plasma fluctuation field) and the wave coherence on the photoionization cross section is considered as an important mechanism which has to be taken into account in a complete and consistent theory. A theory is presented which explains the increase of the intensity of ionospheric airglow emissions observed in the presence of high power HF radio waves by driven oscillations of the energy of the plasma electrons in combination with a narrow band, resonant type excitation behaviour at the atomic transition energy (FIG.9). In this case, the intensity reduction for a plane wave is not given by the usual exponential absorption law anymore but changes to an inversely proportional behaviour (FIG.17). www.plasmaphysics.org.uk /research   (6598 words)

 optics, waves, and sound Waves: Doppler, Bragg diffraction, interference, etc. These are very nice, even if you don't read Italian. Change the phase differences between waves, amplitude, frequency ratio, and direction. Fresnel Diffraction patterns of (a) a straight-edge and (b) a single slit of variable width are displayed as intensity patterns; intensity plots; Cornu Spiral constructions. pdg.lbl.gov /~aerzber/aps_waves.html   (581 words)

 VI. Planetary Reflection Waves ( Page 6 ) The coupling mechanism (between wave and mass) involved in the excitation and damping process that balances a mass in orbit, most likely involves the phase relationships between these mass generated reflection waves, and the Sun generated Ion waves. These wave contact points, possibly represent an area that is in a phase difference or electrical potential disturbance of some type, between an in bound and out bound wave. The second scenario of the one way soliton waves interacting, holds favor with me because of the fact of the planets and their connection to their moons. ourworld.compuserve.com /homepages/jbstoneking/jbspage7.htm   (1097 words)

 Nonlinear Hyperbolic Waves in Phase Dynamics and Astrophysics Hyperbolic models arising in applications often face serious mathematical difficulties related to the occurrence of discontinuities, coordinate singularities, resonance between two or more wave speeds, elliptic regions in phase space, etc. The challenge for mathematicians is to comprehend the properties of nonlinear waves and their relationships with the dynamics of many physical phenomena. The first period of concentration (January– February) was centred around the concept of a kinetic relation, which determines the propagation of undercompressive waves such as those arising in phase transition dynamics. Progress was also made on nonclassical travelling waves with viscosity and capillarity terms and the concept of nucleation and its connection with the stability or instability of interfaces in phase transition dynamics. www.newton.cam.ac.uk /reports/0203/npa.html   (1546 words)

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