The Dielectric and Wire Grid Transmission Line

The Dielectric and Wire Grid Transmission Line
Author: Otho E. Kerr (Jr.)
Publisher:
Total Pages: 30
Release: 1964
Genre: Dielectrics
ISBN:
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A surface wave antenna which has six parameters is discussed. The formulas developed permit a somewhat independent control of the phase and amplitude distribution along surface wave and leaky wave antennas. This design lends itself more readily to the fabrication of non endfire surface wave antennas that were previously designed for the same purpose. Finally it is noted that the formulas developed can be used to design a large number of well known wave guides and surface wave transmission lines. (Author).

On the Resolving Power of Ground Mapping Radar Antennas

On the Resolving Power of Ground Mapping Radar Antennas
Author: J. F. McIlvenna
Publisher:
Total Pages: 66
Release: 1965
Genre: Aerial photography
ISBN:
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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).

Solving the Wiener-Hopf Equation

Solving the Wiener-Hopf Equation
Author: David Arthur Shnidman
Publisher:
Total Pages: 38
Release: 1965
Genre: Communication
ISBN:
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The Wiener-Hopf equation is briefly derived and the method of solving, which is believed easiest to use, is presented. The solution is then specialized for the case where the message and input spectral densities are rational functions.

On the Theory of Boolean Formulas

On the Theory of Boolean Formulas
Author: E. W. Samson
Publisher:
Total Pages: 38
Release: 1965
Genre: Algebra, Boolean
ISBN:
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The theory of substitutions for Boolean formulas developed in a previous report is applied here to the determination of those s-tuples of formulas that may be allowable replacements for s -tuples of sub-formulas of given Boolean formulas. The criteria of allowability are very general and flexible, yet may be expressed with great precision and ease. The results formalize and extend various known isolated instances. They may be used for the study of a large number of problems in the theory and application of Boolean formulas and functions.

Theory of Continuous Zone Refining Via the Zone-transport Method

Theory of Continuous Zone Refining Via the Zone-transport Method
Author: John K. Kennedy
Publisher:
Total Pages: 22
Release: 1964
Genre: Equations of state
ISBN:
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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).