Topic
Fresnel zone
About: Fresnel zone is a research topic. Over the lifetime, 2337 publications have been published within this topic receiving 37650 citations.
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Proceedings Article•
01 Jan 2007
2 citations
01 Jan 1986
TL;DR: The reflectivities of single surfaces at normal or near-normal incidence for soft X rays are very small as mentioned in this paper, and high reflectivities from single surfaces are only obtained at grazing angles of incidence.
Abstract: As discussed in Chapter 1, the reflectivities of single surfaces at normal or near-normal incidence for soft X rays are very small. High reflectivities from single surfaces are only obtained at grazing angles of incidence. This is because the refractive index of the reflecting medium is very close to, and slightly less than, that of the surrounding medium (vacuum)—the conditions under which total external reflection can occur.
2 citations
01 Jan 1988
TL;DR: In this paper, the problem of matching the x-ray source to the X-ray microscope has been investigated, and the existence of a high brilliance source of x-radiation and the need to provide diffraction limited optics for high resolution microscopy has been considered.
Abstract: The recent up-grade of the synchrotron radiation source (SRS) at the Daresbury Laboratory provides an improved low emittance photon source In particular, the existence of a high brilliance source of x-radiation, and the need to provide diffraction limited optics for high resolution microscopy, has stimulated the re-examination of the problem of matching the x-ray source to the x-ray microscope
2 citations
TL;DR: In this paper, the specific features of detecting signals and estimating their parameters in the far field zone of an antenna in the presence of intense interferences in the near field zone are considered using modern adaptive algorithms.
Abstract: The specific features of detecting signals and estimating their parameters in the far-field zone of an antenna in the presence of intense interferences in the near-field zone are considered using modern adaptive algorithms. An imitative simulation shows the possibilities of the adaptive methods for localizing sources in the far- and near-field antenna zones.
2 citations
TL;DR: Simulation results showed that this type of adaptive antenna is capable of performing adaptive beam forming for time-variant channels effectively.
2 citations