The Expansion Of Physical Quantities In Terms Of The Irreducible Representations Of The Scale Euclidean Group And Applications To The Construction Of Scale Invariant Correlation Functions PDF Download

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The Expansion of Physical Quantities in Terms of the Irreducible Representations of the Scale-Euclidean Group and Applications to the Construction of Scale-Invariant Correlation Functions

The Expansion of Physical Quantities in Terms of the Irreducible Representations of the Scale-Euclidean Group and Applications to the Construction of Scale-Invariant Correlation Functions
Author: H. E. Moses
Publisher:
Total Pages: 60
Release: 1972
Genre: Differential equations, Partial
ISBN:

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The Expansion of Physical Quantities in Terms of the Irreducible Representations of the Scale-Euclidean Group and Applications to the Construction of Scale-invariant Correlation Functions

The Expansion of Physical Quantities in Terms of the Irreducible Representations of the Scale-Euclidean Group and Applications to the Construction of Scale-invariant Correlation Functions
Author: H. E. Moses
Publisher:
Total Pages: 94
Release: 1972
Genre: Calculus of tensors
ISBN:

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The irreducible representations of the scale-Euclidean group in three dimensions are introduced, and the general tensor is expanded in terms of these representations. The cases of zero-rank tensor (scalar), rank-1 tensor (vector), and rank-2 tensor, are studied in detail. The expansion is shown to be a generalization of the Helmholtz expansion of a vector into rotational and irrotational parts. As in Part 1 of the work (Concepts: One-Dimensional Problems), the correlations that are introduced are invariant under changes of frames of reference. Correlations are set up between tensors of different ranks and dimensions. A correlation that measures a degree of isotropy is defined.


The Scaling of Physical Quantities and Its Relation to the Power Spectrum of the Mellin Transform

The Scaling of Physical Quantities and Its Relation to the Power Spectrum of the Mellin Transform
Author: Harry E. Moses
Publisher:
Total Pages: 28
Release: 1973
Genre: Fourier transformations
ISBN:

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Just as one uses the power spectrum of the Fourier transform of data given as a function of a one-dimensional variable to find periodicities in the translation of the variable, one may use the power spectrum of the Mellin transform to find periodicities in the magnification. The relation of the Fourier transform to the Mellin transform is discussed, and a theorem of the Wiener-Khinchine type is presented. The use of the Mellin transform, offers a new method of extracting meaningful features from data, particularly when the data is noisy.


Engineering Applications of Noncommutative Harmonic Analysis

Engineering Applications of Noncommutative Harmonic Analysis
Author: Gregory S. Chirikjian
Publisher: CRC Press
Total Pages: 697
Release: 2021-02-25
Genre: Mathematics
ISBN: 1000694259

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First published in 2001. The classical Fourier transform is one of the most widely used mathematical tools in engineering. However, few engineers know that extensions of harmonic analysis to functions on groups holds great potential for solving problems in robotics, image analysis, mechanics, and other areas. For those that may be aware of its potential value, there is still no place they can turn to for a clear presentation of the background they need to apply the concept to engineering problems. Engineering Applications of Noncommutative Harmonic Analysis brings this powerful tool to the engineering world. Written specifically for engineers and computer scientists, it offers a practical treatment of harmonic analysis in the context of particular Lie groups (rotation and Euclidean motion). It presents only a limited number of proofs, focusing instead on providing a review of the fundamental mathematical results unknown to most engineers and detailed discussions of specific applications. Advances in pure mathematics can lead to very tangible advances in engineering, but only if they are available and accessible to engineers. Engineering Applications of Noncommutative Harmonic Analysis provides the means for adding this valuable and effective technique to the engineer's toolbox.


Bibliography, with Abstracts, of AFCRL Publications from 1 January to 31 March 1972

Bibliography, with Abstracts, of AFCRL Publications from 1 January to 31 March 1972
Author: Air Force Cambridge Research Laboratories (U.S.)
Publisher:
Total Pages: 214
Release: 1972
Genre: Military research
ISBN:

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This bibliography lists all AFCRL in-house reports, journal articles, and contractor reports issued from 1 January to 31 March 1972. Abstracts are included.


The Expansion of Electromagnetic Fields and Potentials in the Wave Functions of the Photon

The Expansion of Electromagnetic Fields and Potentials in the Wave Functions of the Photon
Author: Harry E. Moses
Publisher:
Total Pages: 70
Release: 1972
Genre: Electromagnetic waves
ISBN:

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The expansion of the unquantized electromagnetic fields and vector and scalar potentials in terms of the wave functions of the relativistic photon is reviewed and extended. Both linear and angular momentum bases are used for the photon wave functions. After second quantizing the electromagnetic field, the results are applied to the obtaining of the exact matrix elements (that is, with retardation taken into account exactly) and selection rules for the emission of photons by hydrogenic atoms. The dichotomy between the photon and wave picture of electromagnetic radiation is discussed and resolved. Furthermore, the most general vector and scaler potentials are obtained through the use of the eigenfunctions of the curl operator. (Author).


Report on Research at AFCRL.

Report on Research at AFCRL.
Author: Air Force Cambridge Research Laboratories (U.S.)
Publisher:
Total Pages: 336
Release: 1972
Genre: Geophysics
ISBN:

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Bibliography, with Abstracts, of AFCRL Publications from 1 July to 30 September 1971

Bibliography, with Abstracts, of AFCRL Publications from 1 July to 30 September 1971
Author: Air Force Cambridge Research Laboratories (U.S.)
Publisher:
Total Pages: 180
Release: 1971
Genre: Geophysics
ISBN:

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This bibliography lists all AFCRL in-house reports, journal articles, and contractor reports issued from 1 July to 30 September 1971. Abstracts are included.


Bibliography, with Abstracts, of AFCRL Publications from 1 July to 30 September 1972

Bibliography, with Abstracts, of AFCRL Publications from 1 July to 30 September 1972
Author: Air Force Cambridge Research Laboratories (U.S.)
Publisher:
Total Pages: 212
Release: 1972
Genre: Geophysics
ISBN:

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This bibliography lists all AFCRL in-house reports, journal articles, and contractor reports issued during the reporting period. The DD Form 1473 (Document Control Data - R & D) for each publication is included. In Part I, the 1473's for in-house reports are arranged numerically by the series in which they were issued: in Part II, the 1473's for journal articles are arranged alphabetically by author; in Part III, the 1473's for contractor reports are arranged alphabetically by corporate author. For cross-reference purposes, an index is included, listing the publications numerically by the AFCRL document number.


Resonance Scattering of Lyman-Alpha Radiation by Hydrogen in the Ground State

Resonance Scattering of Lyman-Alpha Radiation by Hydrogen in the Ground State
Author: Harry E. Moses
Publisher:
Total Pages: 38
Release: 1973
Genre: Energy levels (Quantum mechanics)
ISBN:

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Consideration is given to the problem of the scattering of a photon by hydrogen in the ground state when the photon has its principal frequencies near that of Lyman-alpha radiation. The scattering operator and cross-section is obtained for this process. The procedure is to adapt Dirac's theory of resonance scattering to the problem and, by quantizing the electromagnetic field in an angular momentum basis, to solve the problem exactly within the framework of the Dirac theory. The total scattering cross-section at resonance is found to be 7.062 x 10 to the -12th power sq. cm. The natural half width of the scattered line is 0.000103 A. The resonance frequency itself is shifted toward the long wave length side by 4281 mc/sec. The shift in the resonance from the original Lyman-alpha frequency can be interpreted as an indication that the Dirac resonance scattering theory contains a large part of the Lamb shift of the ground state. This fact suggests new ways of obtaining the Lamb shift for various levels which will be explored later. (Author).