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Crack propagation in gaseous atmospheres
Materials Science, 1998Environmentally-assisted cracking is studied for an Al-Zn-Mg alloy in different gaseous atmospheres. A sophisticated experimental installation with an ultra-high-vacuum chamber (10-5) is used to maintain and monitor a high-purity atmosphere surrounding the specimen.
J. Ruiz, M. Elices
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Propagation of tweek atmospherics
Journal of Atmospheric and Terrestrial Physics, 1978Abstract In order to investigate the propagation mechanism of tweek atmospherics near mode cut-off frequencies, the attenuation coefficient and excitation factor of the Earth-ionosphere waveguide are calculated for both quasitransverse magnetic (QTM) and quasitransverse electric (QTE) modes.
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Propagation in the earth's atmosphere
IEEE Transactions on Antennas and Propagation, 1969Analytical expressions obtained from electromagnetic field theory are used to plot propagated ray paths as functions of frequency and launch angle. From these plots the dispersive effects are predicted for signals transmitted between any two selected points.
J. Cato +5 more
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Atmospheric effects on IR propagation
SPIE Proceedings, 1993Propagation of electro-magnetic radiation in the marine atmospheric boundary layer is discussed, with emphasis on aerosol effects on extinction. An outline of the atmospheric module of the FEL-TNO range predictor is presented. This model is developed to predict the maximum detectable range of a sensor-target combination both for open ocean and coastal ...
Alexander M. J. van Eijk +1 more
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Optical Propagation through the Atmosphere
1991Questo articolo è il capitolo 19 di 34 capitoli, ciascuno scritto da un eminente esperto nel proprio argomento, che J. Goodmann ha raccolto in un volume promosso dall'ICO ( International Commission for Optics) allo scopo di descrivere la situazione presente della ricerca in ottica a livello mondiale.
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The Propagation of Atmospherics
1976Fundamental problems in atmospherics research are sketched. Breaking the subject down into three natural divisions: sources, propagation medium, and receiving technology, it is shown that, as a rule, only a statistical analysis of the received impulses leads to interpretable and significant results, and that the propagation conditions in the ...
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Propagation through Atmospheric Turbulence
2010Up to this point, the propagation algorithms have been designed to simulate propagation through vacuum and through simple optical systems that can be described by ray matrices. There are several other more complicated and useful applications of the split-step beam propagation method.
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Propagation regimes for turbulent atmospheres
Radio Science, 1975Although much progress has been made in the subject of propagation through random media recently, the average user of the results could be bewildered by the large number of governing parameters and conditions of validity of diverse scintillation statistics.
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Atmospheric Propagation Of Laser Beams
SPIE Proceedings, 1985In general, laser radiation is attenuated as it propagates through the atmosphere. In addition, the laser beam is often broadened, defocused and may even be deflected from its initial propagation direction. These atmospheric effects have far-reaching consequences for the use of lasers in optical communication, weaponry, target designation, ranging ...
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Atmospheric Propagation of Laser Beams
1980To this point lasers and other light beams have been characterized by measurement and by calculation, but the effects of a non-homogeneous or turbulent medium have been ignored. Atmospheric attenuation has been only briefly mentioned. In this chapter these atmospheric effects will be examined in some detail.
David Sliney, Myron Wolbarsht
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