Technical Abstract Bulletin PDF Download
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 908
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Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 908
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Book Description
Author: Air Force Cambridge Research Laboratories (U.S.)
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 322
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Book Description
Summaries are given of research in the following fields: upper atmosphere physics, microwave physics, space physics, terrestrial sciences, optical physics, data sciences, meteorology, solid state, aerospace instrumentation.
Author: Paul H. Carr
Publisher:
ISBN:
Category : Acoustics
Languages : en
Pages : 12
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Book Description
Author: J. Silverman
Publisher:
ISBN:
Category : Crystals
Languages : en
Pages : 22
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Book Description
Author: R. A. Mapleton
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ISBN:
Category : Collisional excitation
Languages : en
Pages : 16
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Book Description
The prior and post Born matrix elements are used to calculate the cross sections for H( - )(1s2) production in hydrogen atom collisions. In contrast to the original version of this work done by Mapleton in 1960, the plane wave approximation to the Coulomb function is partially corrected. The same H( - ) wave functions are used, and the post cross sections are substantially unaltered. Cross sections calculated with the improved H( - ) wave function as compared with the other H( - ) wave functions are from twenty to thirty-five per cent larger for the prior case and twenty to thirty per cent larger for the post case. The post-prior discrepancy, expressed as a ratio, varies between 0.001 and 0.33. (Author).
Author: Carl T. Case
Publisher:
ISBN:
Category : Electromagnetic waves
Languages : en
Pages : 14
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Book Description
Author: Donald R. Fitzgerald
Publisher:
ISBN:
Category : Atmospheric electricity
Languages : en
Pages : 28
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Book Description
Author: Marvin S. Brooks
Publisher:
ISBN:
Category : Antimony
Languages : en
Pages : 94
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Book Description
An experimental study on the zone refining of the binary system triphenyl antimony-benzoic acid is described. 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 k's were calculated and the experimental data compared with those predicted from various mathematical models. (Author).
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: E. A. Lewis
Publisher:
ISBN:
Category : Hanscom AFB (Mass.)
Languages : en
Pages : 18
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Book Description
A nearly vertical antenna wire varying in length from 3000 to 8000 ft was shock-excited by a high-voltage source. The resulting radiation fields were received at distances of about 600 km by two stations separated laterally so as to subtend an angle of about 15© at the source. The difference in wavefront arrival times at the two stations, observed for 101 transmissions, showed an average absolute deviation from the mean of about only 1/2 [mu]s. This figure includes the effects of possible source asymmetries, sferics noise, instrumental errors, and wave propagation. Typical oscillograms of antenna currents and radiation fields are given. It is shown that the amplitudes and durations of the pulse envelopes, the amplitudes and durations of the first half-cycles, and the quasi-frequencies of the pulses are in good agreement with a theory that takes energy losses into account.
