Wavelet packet neural networks for texture classification. Gaussian wave packets september 2000 4 m k k vphase 2. Wave packet analysis cbms regional conference series in. The version we adapt here is from tao03, and the sketch proof given below also follows the proof there. Wave packets and uncertainty the probability amplitude for a free particle with momentum and energy is the complex wave function. This allows for the similar processing of 3d seismic gathers. Duchkov, ipgg sb ras and novosibirsk state university, and fredrik andersson, lund university summary decomposition of seismic data into wave packet representations has been successfully used for 2d data compression. Wave packet a propagating wave field that occupies a finite region of space. In quantum mechanics, a probability amplitude is a complex number used in describing the behaviour of systems. The dynamics of the wave packet in the majorana equation. Pdf synchrosqueezed wave packet transform for 2d mode.
Abstract in the majorana equation for particles with arbitrary spin, wave packets occur due to not. Here youll find current best sellers in books, new releases in books, deals in books, kindle. The wave packet ought to behave in some way like its associated particle e. Various decomposition techniques have been employed in signal processing for exploiting and highlighting the characteristics of a given signal. Femtosecond transient absorption spectra of molecules in solution change when an ultrafast reaction creates a new product state, and coherent optical processes complicate the spectra during the pump pulse. The wave is based on a true incident that occured in a high school history class in palo alto, california, in 1969. A wave packet is often referred to as a wave group. Evolution of wave packets university of texas at austin. Wavemechanical phenomena such as resonance and interference, in both light and matter, are central to the principles of quantum coherent control over molecular processes. The wave packet disperses faster, if it is initially stronger localised. The powerful forces of group pressure that pervaded many historic movements such as nazism are recreated in the classroom when history teacher burt ross introduces a new system to his students. Wave packet definition is a pulse of radiant energy that is the resultant of a number of wave trains of differing wavelengths. The approach discussed in this paper, conceived from the observation of wave packets in scattering phenomena, is to examine the natural representation of a signal through the dynamic time and frequency properties of its energy.
There is a separate chapter on further developments, which gives a broader view on the subject, though it does not exhaust all ongoing developments. This situation is permitted by the principle of superposition. The archive consists of source codes for applying decomposition and reconstruction of seismic data with gaussian wave packets of the form. This transform is a combination of wave packet transforms of a certain geometric scaling, a reallocation technique for sharpening phase space representations, and clustering algorithms for modal. However, it cannot give us exact values for either. The group velocity vgroup does not equal phase velocity vphase and the wave packet.
Wave packets article about wave packets by the free. Conversely, if we only combine plane waves whose wavenumbers differ by a small amount i. Generally, wavelets are intentionally crafted to have specific properties that make them useful for signal processing. Alternatively, the gaussian is at half its maximal value at x 1.
Threelevel wavelet transform on signal x of length 16. Namely, in order to construct a packet that is highly localized in space i. In this paper we address the problem of developing a fast parallel implementation of 3d wavepacket transform pairs working on gpus. This example shows that information can be conveyed in st at the rate of. Wave packet dynamics in the majorana equation luca nanni corresponding author email. Notable implementations are jpeg 2000, djvu and ecw for still images, cineform, and the bbcs dirac. The book gives a nice survey of important material, such as an overview of the theory of singular integrals and wave packet analysis itself. A simulated multimode signal and the response of the scattered wave signature from an isolated spherical shell are examples used to illustrate a heuristic approach, based on this decomposition method, for resolving the inverse problem in physical systems.
The goal is to store image data in as little space as possible in a file. The modulus squared of this quantity represents a probability or probability density probability amplitudes provide a relationship between the wave function or, more generally, of a quantum state vector of a system and the results of observations of that. The wavelet packet method is a generalization of wavelet decomposition that offers a richer signal analysis. Its graph as function of k is a bellshaped curve centered near k 0. Gaussian wave packet lecture notes the gaussian wave function is determined by its wave function in the wavevector space. Wave packets penn state college of earth and mineral. Two examples of localized wave packets lets now try two examples of a wave packet localized in and properly normalized at. It shows that due to the wave nature of particles, we cannot localize a particle into a small volume without increasing its energy. A wave packet can be analyzed into, or can be synthesized from, an infinite set of component sinusoidal waves of different wavenumbers, with phases and amplitudes such that they interfere constructively only over a small region of space, and destructively elsewhere. This is similar to the notion of decomposing a signal in terms of fourier transform components or walsh or haar functions. Download pdf scatteringtheoryinquantummechanics free. We aim at optimizing the code for processing large volumes of data. Phase decomposition method for single surface wave type in order to investigate the x phase recorded from the med site, a vertical array analysis method for a pair of records is developed.
The wave packet around 21 s in the ud component x phase in fig. Using wavelet decomposition technic, it is possible to decompose a signal into a series of orthogonal wavelets. Read online wave pdf by sonali deraniyagala for free. This wave packet provides information about both the location and momentum of the object. Wavelet packet atoms are waveforms indexed by three naturally interpreted parameters. Photon wave functions, wavepacket quantization of light, and coherence theory 11. For example, we can estimate the ground state energy and the size of a hydrogen. A wave packet refers to the case where two or more waves exist simultaneously. Waves and particles are independent paradigms of classical physics.
Pdf 3d wavepacket decomposition implemented on gpus. A library for 3d gaussian wave packet decompositions. Coherence and control in photomolecular wave packet. Chapter 4 schroedinger equation mit opencourseware. Parallel algorithm of 3d wavepacket decomposition of. A multiresolution representation of provides a simple hierarchical framework to analyze the signal at different resolution level. The pdf gathers together much of the information on ew that is published on this site into a handy pdf reference guide which is free to download. This principle states that if any two waves are a solution to the wave equation then the sum of the waves is also a solution. This paper introduces the synchrosqueezed wave packet transform as a method for analyzing twodimensional images. It can typically be visualized as a brief oscillation like one recorded by a seismograph or heart monitor. This illustrates an important property of wave packets. Another fundamental concept of classical physics is the wave.
This book contains an exposition of some of the main developments of the last twenty years in the following areas of harmonic analysis. Focusing on the dynamical aspects, this dissertation is a compilation of studies on the interaction physics involving wave packets in molecules, the driving light field, and the underlying coherence and. A small wave wavelet transforms convert a signal into a series of wavelets provide a way for analyzing waveforms, bounded in both frequency and duration allow signals to be stored more efficiently than by fourier transform be able to better approximate realworld signals wellsuited for approximating data with sharp. The wave function in quantum mechanics kiyoung kim department of physics, university of utah, slc, ut 84112 usa abstract through a new interpretation of special theory of relativity and with a model given for physical space, we can nd a way to understand the basic principles of quantum mechanics consistently from classical theory. This transform is a combination of wave packet transforms of a certain geometric scaling, a reallocation technique for sharpening phase space representations, and clustering algorithms for modal decomposition. Up is onetoone from p into g, where g is given by 1. In physics, a wave packet or wave train is a short burst or envelope of localized wave action that travels as a unit. Now we state the wave packet decomposition that will be used in this text. In this paper we present a fast implementation of a 3d wavepacket decomposition using graphical processing units gpus. A new basis of 3d wave packets was recently developed specifically for seismic applications. We discuss the common approach for deriving the equations for the description of wave beams and wave packets in a wide range of angles and frequencies by decomposition of the initial equations into coupled equations of normal waves with.
It can be seen in 17 that the height of the wave packet also vanes, but in opposition to the width, so the norm of tjjx, t remains. A lowfrequency vibration may also be found to modulate an absorption or emission band for the first few picoseconds. There is a separate chapter on further developments, which gives a broader view on the subject, though. We can check the speed with which the packet moves by calculating its group velocity v. Wave packet definition of wave packet by merriamwebster.
Photon wave functions, wavepacket quantization of light. The wave function for a single electron, also called a wave packet, is created by combining many wave functions with different wavelengths, where the wavelength is determined by the electrons momentum. There is a separate chapter on further developments, which gives a broader view on the subject, though it does notexhaust all ongoing developments. Article pdf available in expert systems with applications 32. We point out that there are some other versions of the wave packet decom. In fact, a plane wave is usually interpreted as a continuous stream of particles propagating in the same direction as the wave. Wavelet compression is a form of data compression well suited for image compression sometimes also video compression and audio compression. The books homepage helps you explore earths biggest bookstore without ever leaving the comfort of your couch. Shortly after it was published in t he fall of 1925 pieter debye, a. Free elliott wave pdf the free elliott wave pdf by kenny at traders day trading is our quick start guide that will give you a very good overview of the basics of the wave theory. Since the traveling wave solution to the wave equation. Decomposition of seismic data into wavepacket representations has been successfully used for 2d data compression, interpolation and denoising. Wavelet decomposition an overview sciencedirect topics. A wavelet is a wavelike oscillation with an amplitude that begins at zero, increases, and then decreases back to zero.
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