نتایج جستجو برای: ray diffractions
تعداد نتایج: 303137 فیلتر نتایج به سال:
In this article, I study the everyday conduct of pedagogies in wild contemporary academia by means an analysis modes attention random “thicker ‘moments’of spacetimemattering” (Barad, 2014, p. 169). These are discussed with help notion diffraction. identify three attention—the solitary, connected, and wild—that manifest themselves mainly as tensions between several modes. The leads me to suggest...
Though there are a variety of experimental techniques available for residual stress measurements, diffraction-based measurements have the unique advantage estimating individual components strain matrix in crystalline material. This is then converted to stresses with appropriate continuum elasticity model(s) and X-ray elastic constants. In particular, based on electron or neutron diffractions th...
We adopt a multidomain pseudospectral method to analyze lamellar gratings for general conical diffraction from TE and TM diffractions. The validity and usefulness of this approach are demonstrated through normal metallic lossy and highly conductive lossless gratings. The developed method provides excellent numerical stability and convergence over commonly used rigorous couple wave analysis (RCW...
Designers of low-power radio systems for use in urban areas would benefit from accurate computer-based predictions of signal loss due to shadowing. This paper presents a propagation prediction method that exploits a building database and considers the three-dimensional profile of the radio path. Models and algorithms are provided that allow the application of Fresnel-Kirchhoff diffraction theor...
The high-frequency channel of lunar penetrating radar (LPR) onboard Yutu-2 rover successfully collected high quality data on the far side Moon, which provide a chance for us to detect shallow subsurface structures and thickness regolith. However, traditional methods cannot obtain reliable dielectric permittivity model, especially in presence mix between diffractions reflections, is essential un...
Ground penetrating radar (GPR) is important for detecting shallow subsurface structures, which has been successfully used on the Earth, Moon, and Mars. It difficult to analyze underground permittivity from GPR data because its observation system almost zero-offset. Traditional velocity analysis methods can work well with separable diffractions but fail strong-interfered diffractions. However, i...
Mass-transport complexes (MTCs) are often characterized by small-scale discontinuous internal structure, such as slide blocks, rough interfaces, faults, and truncated strata. Seismic images may not properly resolve structure because seismic reflections fundamentally limited in lateral resolution the source bandwidth. The relatively weak diffractions, instead, encode information on subwavelength...
1. INTRODUCTION Recently, the studies on the scattering of electromagnetic waves by a cylindrically curved conducting open surface are becoming an important subject for a variety of applications [1]-[4]. When the geometrical ray or the creeping wave is incident on the edge of the cylindrically curved conducting open surface, the geometrical rays and the whispering gallery modes, which cling to ...
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