Materials Literature
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Ab initio calculations based on the density functional theory have been performed to investigate the migrations of interstitial helium (He) atoms in Au-Ag alloys with two different mass ratios (Au3Ag2 and AuAg). The results show that the migration mechanisms of He atoms mainly depend on the crystal structures of alloy…
In this study, hardfacings were obtained by using with submerged arc welding powders including different high carbon ferrochromium (4-16 wt.%) and currents from 400 A to 550 A. In order to determine the optimal process parameters in hardfacings, we presented two neural network based predictions with ANN algorithm for…
A tri-layered chiral metasurface is proposed and demonstrated to exhibit broadband asymmetric transmission of linearly polarized electromagnetic waves in two opposite directions. The full wave simulation shows that the proposed metasurface can rigorously satisfy the asymmetric transmission (AT) theorem and can achieve…
This paper presents a bi-state frequency selective surface (FSS) designed using a passive and active FSS on both side of a thin dielectric substrate. Specifically, the proposed unit cell (of the bi-state FSS) includes a passive loaded cross dipole FSS on one side and an active dipole (utilizing PIN diodes) with perpen…
We present a computationally efficient technique for termination of a computational domain in open-domain scattering simulations based on a double higher-order (higher order in geometry and field approximation) finite element method (DHO-FEM). The computational domain is surrounded by an anisotropic, locally-conformal…
In this paper we employ the theory of sinusoidally modulated reactance surfaces (SMRSs) to enable leaky wave antennas (LWAs) capable of converting spoof plasmons (SPs) to radiating modes. SPs are surface waves excited along engineered metallic corrugated surfaces and their dispersion properties closely resemble those…
Two phased array antennas realized in multilayer ferrite LTCC technology are presented in this paper. The use of embedded bias windings in these designs allows the negation of external magnets which are conventionally employed with bulk ferrite medium. This reduces the required magnetostatic field strength by 90% as c…
Besides amplitude, phase and polarization, wave-front is also an important property of electromagnetic waves. EM waves with helical wavefront carrying orbital angular momentum (OAM) attract more attentions recently for its promising applications in communications. The OAM generation for microwaves was rarely reported.…
A 600kW permanent magnet traction motor is taken as a research object in this paper, based on the computational fluid dynamics and the numerical heat transfer theory, a three dimensional for fluid flow and heat transfer model is established. Thus, the temperature field and fluid field of permanent magnet traction moto…
This paper presents the design of a flat lens, which utilizes multilayer frequency selective surfaces (FSSs) in free space. The lens can be space-qualified since, unlike conventional designs for lenses, it does not need to use dielectric materials. The paper describes a systematic procedure for realizing the requisite…
We present an electromagnetic synthesis of a nongyrotropic nonreciprocal (NG-NR) metasurface and demonstrate that this structure is equivalent in electromagnetic sense to a monoanisotropic uniaxial medium moving with constant velocity. In addition, we validate the NG-NR operation of the metasurface and discuss possibl…
The fog haze weather occurred frequently in our country, when HVDC transmission lines through the haze area, especially ion flow field, the effect is particularly prominent. So study of haze weather influence on ion flow field of HVDC transmission line has important engineering significance. Firstly, the paper studied…
Black phosphorus (BP) is an intrinsically anisotropic 2D material that possesses exotic electrical and physical properties, including a direct bandgap, the ability to support surface plasmons polaritons (SPPs) at infrared and optical frequencies, and electrical reconfiguration through applied electrostatic/magnetostat…
Metamaterials are artificial materials formed by highly subwavelength inclusions embedded in a host medium, which yield homogenized permittivity and permeability values. They offer electromagnetic unusual responses not generally available in nature. The aim of this paper is to provide a historical overview of electrom…
For engine equipped with dual switch-type oxygen sensors upstream and downstream of the Three-Way Catalyst (TWC), an innovative dual-loop control model of excess air ratio is proposed here. The front oxygen sensor is used to perform PI feedback control of the closed-loop control factor that makes λ ripple periodically…
In the present work, we performed coulometric measurements to detect the water content in archaeological pottery in order to get information on the manufacture technique. The samples under study were the so-called "Ionian Cups" coming from various archaeological sites in eastern Sicily (South-Italy). In particular, we…
This work offers a new mechanism for far-field high-resolution imaging based on illumination by a one-dimensional array of subwavelength resonant apertures lined using epsilon-negative and near-zero (ENNZ) metamaterials. Each aperture in the array exhibits a fano-like transmission resonance-antiresonance profile, and…
The concept of a three-dimensional metasurface is introduced. Three-dimensional metasurfaces are electrically-thin structures that utilize longitudinally polarized surface currents, which can enable properties that are not possible using only transverse surface currents. These new surfaces provide unprecedented wavefr…
We reveal that the unique properties of ultrathin metasurface resonators can improve dramatically magnetic resonance imaging (MRI). We place a metasurface formed by an array of metallic wires inside a scanner under the studied object and achieve a substantial enhancement of the radiofrequency magnetic field by means o…
We propose the design of a magnet-free non-reciprocal leaky-wave antenna at terahertz (THz) frequencies based on a spatiotemporally modulated graphene monolayer. Spatiotemporal modulation is achieved through time-varying voltages applied over a set of gate electrodes beneath the graphene monolayer, providing ample fre…