Calculated Cross Sections for Atomic Displacements Produced by Electrons in the 1.0-3.0 MeV Energy Range PDF Download
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Author: Edward A. Burke
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 30
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Book Description
Author: Edward A. Burke
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 30
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Book Description
Author: Marden H. Seavey
Publisher:
ISBN:
Category : Acoustic paramagnetic resonance
Languages : en
Pages : 14
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Book Description
Author: John K. Kennedy
Publisher:
ISBN:
Category : Equations of state
Languages : en
Pages : 18
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Book Description
This paper explains the differences and the reasons for the differences which exist between the theory of the zone-transport system of continuous zone refining as presented by W. G. Pfann and T. Abe. The identity between the mathematical model used to describe the zone-transport system and one of the models used to describe the recently reported matter-transport system is noted. Nondimensional equations for the zone-transport system are presented and the difference between the limit of alpha in the zone-void and zonetransport systems, when L sub e = 0, is correlated. (Author).
Author: Edward E. Altshuler
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ISBN:
Category : Astronautics
Languages : en
Pages : 46
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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).
Author: Yūji Inoue
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 46
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Book Description
The propagation of electromagnetic waves in a horizontally stratified layer of gyrotropic medium is discussed. Derivation of a comprehensive representation for magneto-ionic coupling coefficients allows interpretation of the physical significance of the coupling. Introduction of an invariant quantity for an inhomogeneous medium becomes an important guide for numerical solutions of the wave equation. Numerical results of magneto-ionic coupling coefficients are presented. Based on region properties, characteristic wave types are defined: for the isotropic region, linearly polarized waves are used; for the anisotropic region, elliptically polarized waves generally are applied. (Author).
Author: Roger Even Bove
Publisher:
ISBN:
Category : Algorithms
Languages : en
Pages : 118
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Book Description
The following paper represents work to date on the deformation method for quadratic programming and thus may be regarded as a sequel to Zahl, S. (1964) A Deformation Method for Quadratic Programming, Research Note AFCRL-63-132. It gives an explanation of a modified Iverson programming language and uses this to give a detailed algorithm for the Zahl Deformation Method of Quadratic Programming.
Author: Alfred Kahan
Publisher:
ISBN:
Category : Crystal lattices
Languages : en
Pages : 28
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Book Description
Methods of obtaining the optical constants of a material from the analysis of the reflectivity spectrum are given. Both the Kramers-Kronig integral relations and the classical oscillator theory are discussed and applied to the infrared lattice vibration data of Mg2Sn and CaF2.
Author: J. F. McIlvenna
Publisher:
ISBN:
Category : Aerial photography
Languages : en
Pages : 66
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Book Description
The mapping of extended, cultural ground targets by an airborne radar is examined using communication theory concepts including those of the antenna transfer function and the target spatial frequency spectrum. Use of the set of transfer functions that correspond to Taylor aperture distributions and specification of the targets directly in terms of their spatial frequency spectra, permits one to examine the antenna images for quality and resolution. The results obtained indicate that resolution for a class of ground targets can be much better than is predicted by the two-point Rayleigh resolution criterion. It is also true that there can be situations in which the shape of the antenna images are quite independent of the radiation pattern. Several types of spatial noise were also included in the input spectrum to investigate noise effects on image quality and resolution. (Author).
Author: Marvin S. Brooks
Publisher:
ISBN:
Category : Antimony compounds
Languages : en
Pages : 114
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Book Description
The results of an experimental study of zone refining of the binary system triphenyl antimony-biphenyl are presented. The isotope Sb124, which is a strong gamma emitter, was employed as a tracer; this allowed a rapid in situ nondestructive analysis, closely spaced experimental points, and the opportunity to study distribution as a function of varying experimental conditions. With the aid of computers (IBM 7090 and IBM 7044) apparent (distribution coefficients) were calculated and the experimental data compared with those predicted from various mathematical models. (Author).
Author: Daniel J. Jacavanco
Publisher:
ISBN:
Category : Antennas, Horn
Languages : en
Pages : 22
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Book Description
Antenna patterns (E-plane) of an X-band horn mounted in a ground plane and covered by a plasma slab were measured. A pulsed plasma was produced by capacitor discharge in a rectangular pyrex container of 6 in. x 2 in. x 24 in. i.d. Microwave interferometer measurements of the electron density were made at 9 and 35 Gc. Antenna patterns are presented which show a sharp decrease in radiated power at certain angles corresponding to the 'optics critical angle'. Good agreement is obtained for the movement of the optics critical angle with plasma density. (Author).
