Materials Literature
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We present two different points of approaches to a class of antenna designs, based on two variations of the Transformation Electromagnetics (T-EM) approach, both of which have been introduced recently in the literature. The first of these addresses the antenna and absorber design problems from the Transformation Optic…
Metamaterial applications such as cloaking, perfect lenses, and artificial permeability are restricted by the frequency dependence of the permittivity, permeability, and index of refraction. Here, causality and passivity together with integral identities for Herglotz functions are used to construct sum rules. The sum…
We examine VHF and optical images of cloud-to-ground flashes to study IC leaders that propagated within thunderclouds and CG leaders that descended outside thunderclouds. It is shown that IC leaders developed smoothly and CG leaders propagated in a heavily branched manner. We speculate that, in the case of IC leaders,…
The intrinsic defects in epitaxial semi-insulating 4H-SiC that are implanted by Si ion, annealing after implanted respectively are studied by electron spin resonance (ESR). The results show that the intrinsic defects in Si ion implanted and annealing are the same as that as-grown 4H-SiC consist of carbon vacancy (Vc)…
We present some integral-equation approaches for the accurate solution of different problems in computational electromagnetics. First, an efficient MPI/OpenMP parallel implementation of MLFMA-FFT algorithm is presented for the solution of large-scale metallic conducting bodies. By combining the high scalability of FMM…
The variation features of double-deck rectangle phase grating were theoretically investigated, and the conditions for split of two bunches of light, three bunches of light and four bunches of light were discussed. By computer simulation, optimal parameters were put forward.
The effect of ferromagnetic impurities in electromagnetic based shungite absorbers is studied. The presence of the particles magnetic powder in composite structure influences on attenuation and reflection characteristics of shielding material has been established. It is found that exact quantity of magnetic inclusions…
The effect of gaseous ammonia intercalation (IC) on the optical and structural properties of two-layer Ag-PbI2 systems and PbI2 films, both freshly prepared and irradiated by laser beams with wavelengths λ a = 442 nm and λ0 = 633 nm, is studied. The changes in the spectra of optical transmittance are shown to be cause…
Abstract not Available.
The effect of gelation and the modulation of their properties with the variation of aliphatic hydrocarbon solvents, e.g., n-decane and n-dodecane have been presented for a homologous series of amides of L-alanine with fatty acids. The gelation properties of these compounds were studied by a number of physical methods…
The safety instrumentation and control (I&C) system of the 10MW High Temperature Gas-cooled Reactor (HTR-10) is the key system referred to the safety of the reactor. It is designed based on the advanced digital control techniques. This article introduced its architecture, configuration, design feature and engineering…
Superplastic forming using resistance heating (SPFRH) is developed to solve the problems of high energy consumption and low efficiency. In this process, the sheet is connected in series with a high current circuit and heated directly by the electrical resistance. The heating rate of the sheet is controlled by current…
In this work we combine ion track techniques to construct self-aligned vertical structures with nanometer dimensions. The main idea is to use multilayer targets and apply various etching techniques to create openings along the ion path. By irradiating such a multilayered sample including a tetrahedral amorphous carbon…
Several nonlinear-optical coupling schemes in double domain positive/negative index metamaterials are proposed, which include ordinary and backward electromagnetic waves. One of them is investigated in the context of the applications to compensating strong losses inherent to plasmonic metamaterials and to design of no…
In this paper, polypropylene foam was prepared by chemical extruded foaming, the effect of formulation and process conditions on properties of polypropylene foam was investigated. The results show that the main factor affecting polypropylene foam is the die temperature, when the screw temperature is 182°C, the die tem…
Effects of micro alloying element Sr on the microstructure and mechanical performance of Mg-Al alloy were studied in this paper. X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM) were employed to analyze and observe the microstructure of the alloy. It was found that accompanying w…
The deep quasiperiodic variations in the part of frequency dependence of amplitude of reflections from layer Es observed by Kazan ionosonde was discovered. The analysis of height location of traces in an ionogram has shown that beatings arise because of interference between o- and x-modes. For an explanation of such i…
We investigate a nano-aperture based plasmonic metamaterial by integrating the U- and T-shaped nano-aperture antennas in a compact geometry. We experimentally and numerically demonstrate the physical origin of the multi-resonant behavior of the UT-shaped nano-aperture based metamaterials. We also determine the paramet…
The results of an investigation into the interrelation between the fatigue behavior (number N of cycles to failure) and the level of surface residual stresses (σ) of the cyclic deformation of the samples of high-tensile aluminum alloy with the nanosized reinforcing phase, which is used for the production of drill pipe…
Abstract not Available.