The Spectral Shifts of Truncated Sinusoids
Author : Kurt Toman
Publisher :
Page : 12 pages
File Size : 26,75 MB
Release : 1965
Category : Radio waves
ISBN :
Spectral Analysis for Physical Applications
Author : Donald B. Percival
Publisher : Cambridge University Press
Page : 616 pages
File Size : 28,49 MB
Release : 1993-06-03
Category : Mathematics
ISBN : 9780521435413
Book Description
This book is an up-to-date introduction to univariate spectral analysis at the graduate level, which reflects a new scientific awareness of spectral complexity, as well as the widespread use of spectral analysis on digital computers with considerable computational power. The text provides theoretical and computational guidance on the available techniques, emphasizing those that work in practice. Spectral analysis finds extensive application in the analysis of data arising in many of the physical sciences, ranging from electrical engineering and physics to geophysics and oceanography. A valuable feature of the text is that many examples are given showing the application of spectral analysis to real data sets. Special emphasis is placed on the multitaper technique, because of its practical success in handling spectra with intricate structure, and its power to handle data with or without spectral lines. The text contains a large number of exercises, together with an extensive bibliography.
Spectral Analysis for Univariate Time Series
Author : Donald B. Percival
Publisher : Cambridge University Press
Page : 718 pages
File Size : 23,83 MB
Release : 2020-03-19
Category : Mathematics
ISBN : 1108776175
Book Description
Spectral analysis is widely used to interpret time series collected in diverse areas. This book covers the statistical theory behind spectral analysis and provides data analysts with the tools needed to transition theory into practice. Actual time series from oceanography, metrology, atmospheric science and other areas are used in running examples throughout, to allow clear comparison of how the various methods address questions of interest. All major nonparametric and parametric spectral analysis techniques are discussed, with emphasis on the multitaper method, both in its original formulation involving Slepian tapers and in a popular alternative using sinusoidal tapers. The authors take a unified approach to quantifying the bandwidth of different nonparametric spectral estimates. An extensive set of exercises allows readers to test their understanding of theory and practical analysis. The time series used as examples and R language code for recreating the analyses of the series are available from the book's website.
Asymptotic Solutions of Dipoles in a Semi-infinite Medium
Author : Kondagunta U. Sivaprasad
Publisher :
Page : 62 pages
File Size : 10,73 MB
Release : 1965
Category : Antennas (Electronics)
ISBN :
Book Description
A theoretical analysis is made of the electromagnetic fields in two homogeneous media separated by a plane interface with a point source located in the denser medium. The solution is expressed in the form of integrals which cannot be evaluated explicitly. Asymptotic evaluations of the integrals have been made by many investigators using the saddlepoint technique. In the present work, all known asymptotic results are presented in one comprehensive form, using a modification of the method suggested by Lighthill for the asymptotic evaluation of the Fourier integrals. The regions of validity of the solutions are indicated wherever possible. The advantage of this method over others is its ease and simplicity. The present results agree term by term with the earlier ones of Banos and Wesley (1953-1954), and Paul (1959), who investigated the case of a source and receiver close to the interface, and an arbitrary location of source and receiver, respectively. The results obtained in the report are also compared with those of Stein (1955). (Author).
An Anomaly in the Resistivity-temperature Profile of Ultrapure Phenanthrene
Author : Paul A. Andrews
Publisher :
Page : 14 pages
File Size : 40,16 MB
Release : 1965
Category : Phenanthrene
ISBN :
Book Description
The Application of a System of Fixed-rotating Vectors to Circuit Analysis and Synthesis
Author : Carl T. Case
Publisher :
Page : 22 pages
File Size : 26,96 MB
Release : 1965
Category : Dielectrics
ISBN :
Book Description
A system of fixed-rotating vectors can be used to study the impedance loci of functions of the first Foster form and of systems including negative impedance converters. Of particular interest in the field of dielectrics and biological membrane studies is a parallel RC network, where the dielectric of the capacitor is given by the Debye dispersion relations. Such a network also falls into the category of the first Foster form.
Bibliography of AFCRL In-house Technical Reports
Author : Air Force Cambridge Research Laboratories (U.S.)
Publisher :
Page : 88 pages
File Size : 47,47 MB
Release : 1967
Category : Atmosphere, Upper
ISBN :
Book Description
The bibliography of AFCRL in-house technical reports lists all reports issued in the existing series. In addition, appendices list reports issued from 1962 to 1964 when series designations were not used, and reports issued in now-defunct series.
On the Acoustic Basis of the Perception of Intonation by Linguists
Author : Philip Lieberman
Publisher :
Page : 26 pages
File Size : 10,39 MB
Release : 1965
Category : Intonation (Phonetics)
ISBN :
Book Description
Earth-to-space Communications at Millimeter Wavelengths
Author : Edward E. Altshuler
Publisher :
Page : 46 pages
File Size : 19,69 MB
Release : 1965
Category : Astronautics
ISBN :
Book Description
It is expected that with the exploration of outer space, a requirement for high data rate earth-to-space communication channels will arise. A program to investigate the feasibility of using the millimeter-wave region of the spectrum for this application is presented. The theory of atmospheric attenuation resulting from losses due to absorption, scattering and refraction processes is reviewed and used to estimate propagation losses produced by atmospheric gases, clouds and precipitation. Curves of total atmospheric attenuation and noise level as a function of meteorological parameters and antenna elevation angle are also presented. A series of experiments designed to obtain as much information as possible on the limitations imposed by the atmosphere on millimeter-wave propagation is considered. Although experiments using natural celestial bodies such as the sun, moon, planets and galaxies as radio sources are emphasized, those which would utilize aircraft, rockets and satellites are also mentioned. Finally, the characteristics of a recently installed precision 29-ft antenna designed to operate at 35 Gc (wavelength = 8.6 mm) with a traveling-wave maser as a preamplifier for the radiometer are outlined along with the specific experiments for which this antenna system will be used. (Author).
Nonlinear Terms in the Generalized Ohm's Law
Author : Noel Stone
Publisher :
Page : 58 pages
File Size : 25,84 MB
Release : 1965
Category : Electric currents
ISBN :
Book Description
It is shown that a spatial gradient in the steady flow of an ionized gas introduces terms into the generalized Ohm's law that represent an exchange of momentum between the electrons and the gas flow. Depending upon the flow geometry and gas compressibility this electrokinetic exchange can behave like a generator, a Hall current, or a resistive current. The scale of the phenomenon is L = +/V, where V is fluid velocity, + is electron-positive charge collision time. Electrokinetic conditions apply largely at boundaries. In a resistive medium with a static B-field, the principal condition for electron-flow interchange is that magnetic pressure dominate dynamic pressure. At the boundary of a plasma jet the scale over which EK terms are important is of the order of 1 mm. Only geometry and scale considerations are used in the momentum equation. The electrokinetic generation of surface currents is as fundamental for describing moving media as spacecharge effects are in the static case. (Author).
