| Autor: |
Zhou YH; Department of Mechanics, Lanzhou University, 730000 Gansu, PRC., Shu He Q, Jing Zheng X |
| Jazyk: |
angličtina |
| Zdroj: |
The European physical journal. E, Soft matter [Eur Phys J E Soft Matter] 2005 Jun; Vol. 17 (2), pp. 181-7. Date of Electronic Publication: 2005 May 23. |
| DOI: |
10.1140/epje/i2004-10138-5 |
| Abstrakt: |
A theoretical approach for predicting the attenuation of microwave propagation in sandstorms is presented, with electric charges generated on the sand grains taken into account. It is found that the effect of electric charges distributed partially on the sand surface is notable. The calculated attenuation is in good agreement with that measured in certain conditions. The distribution of electric charges on the surface of sand grains, which is not easy to measure, can be approximately determined by measuring the attenuation value of electromagnetic waves. Some effects of sand radius, dielectric permittivity, frequency of electromagnetic wave, and visibility of sandstorms on the attenuation are also discussed quantitatively. Finally, a new electric parameter is introduced to describe the roles of scattering, absorption and effect of charges in attenuation. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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