نتایج جستجو برای: wave reflection
تعداد نتایج: 273790 فیلتر نتایج به سال:
Abstract The reflection coefficient of a microwave surface wave incident at the termination metasurface is explored. Two different types are examined. One square array metallic patches on dielectric-coated ground plane, other Sievenpiper ‘mushroom’ array. In latter fields more confined within structure. Comparison measured surface-wave spectra made with that obtained from analytic theory and nu...
This paper reports on the mechanism of hysteresis in transition between regular and Mach shock wave reflections. We disclose that, for a given inflow number, stable reflection configuration should maintain minimal dissipation. As wedge angle varies, set dissipation points forms valley lines landscape, these compose loop. The saddle-nodes, intersections ridge line, are actually points. Additiona...
This paper presents the results of a study carried out to determine the change in wave climate around an array of hypothetical wave devices. The main objective of this work is to investigate the change in wave height in the upstream and downstream of the devices for different levels of wave absorption. This is achieved by modeling the wave devices as porous structures with different porosity le...
Simple and explicit expressions for the phase shifts that p- and s-polarized light experience in frustrated total internal reflection (FTIR) and optical tunneling by an embedded low-index thin film are obtained. The differential phase shifts in reflection and transmission deltar, deltat are found to be identical, and the associated ellipsometric parameters psir, psit are governed by a simple re...
In this research, FeNi@PANI nanocomposites as the electromagnetic wave absorbers were prepared through two following steps. At first, FeNi alloy nanoparticles were synthesized by the one-pot polyol process, and then, in-situ polymerization method was used for the preparation of FeNi@PANI nanocomposite. The XRD pattern confirmed the formation of pure FeNi alloy with the FCC crystalline phase. Th...
The value of increased arterial wave reflection, usually assessed by the transit time-dependent augmentation index and augmented pressure (Pa), in the prediction of cardiovascular events may have been underestimated. We investigated whether the transit time-independent measures of reflected wave magnitude predict cardiovascular outcomes independent of arterial stiffness indexed by carotid-femor...
Early return of reflected pressure waves increases the load on central arteries and may increase the risk of aortic rupture in patients with Marfan's syndrome (MFS). To assess whether wave reflection is elevated in MFS, we used ultrasound and MRI to measure central pressure and flow waveforms in 26 patients (13-54 yr of age) and 26 age- and gender-matched controls. Aortic systolic and diastolic...
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