Materials Literature
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By combining a transmitarray-based controllable phase-delay surface with a near-zero-index collimating metalens, a compact, high-gain, upper-hemisphere scanning antenna can be constructed. The ability of the ZIM lens to produce a nearly uniform field amplitude and phase across its surface provides an efficient input f…
sp2 rich carbon films were produced by using magnetron sputtering deposition. The hardness, friction coefficient and wear volume were elevated by Knoop micro-hardness and pin-on-disk tester; The composition and microstructure of the carbon films have been characterized in detail by combining the techniques of Rutherfo…
The transformer model is one of the most needed to improving components of the modern transient simulation software. A new nonlinear broadband frequency (50Hz-10MHz) model of power transformer is proposed in this paper. The model is divided into a linear block and a nonlinear block by a reasonable equivalent transform…
Metamaterials, i.e. engineered composite materials structured in sub-wavelength building blocks, attract nowadays continuously increasing attention. This is mainly due to the unique properties of those materials, which entail new possibilities for the manipulation of electromagnetic (EM) waves. With metamaterials one…
These are exciting times for materials science—a field which is growing more rapidly than any other physical science discipline. More than ever, the field is providing the vital link between science and engineering, between pure and applied. But what is the subject's definition and why is the field ballooning? I addre…
Summary form only given. The goal of this paper is to define a unit cell containing an electric and magnetic complement and degenerate pair of resonators and subsequently construct a 3-dimensional (3D) n = -1 refractive index prism based upon the final unit cell design. In this effort simulating and observing the resp…
CaS:Eu2+phosphors were prepared by two steps method at a relatively low temperature (1050°C) using NH4Cl as a flux. The influences of NH4Cl flux concentrations on the crystal structure, morphology and photoluminescent properties of CaS:Eu2+phosphors were investigated by X-ray diffraction (XRD), scanning electron micro…
This paper proposes a novel dual-layer electrode configuration for the liquid crystal compensator design. It has the feature of two conducting transparent electrode layers separated by a dielectric insulation layer, which sustains the electric isolation. With the design, the adjacent electrodes with almost no gap widt…
We demonstrated and fabricated a polarization Insensitive high reflective Subwavelength grating Mirror based on SOI structure. The results show that it offers high reflection with TM (>99%) polarization and TE (>80%) polarization from 1500–1600nm wavelength.
Moisture severely affects aerospace structures and offshore platforms during their service life span. It deteriorates the mechanical performance of polymeric composites through long term and cyclic hygrothermal ageing. This reduction in mechanical performance must be considered during product design to ensure long-ter…
An overview of the micromechanical issues of heterointegration by wafer bonding and layer exfoliation is presented for the systems of AlN on sapphire and epitaxial Si1-xGexand Ge-free bi-axially strained sSOI. AlN layers grown epitaxially on sapphire were implanted with hydrogen ions at 50 keV with various fluences ra…
High-strength steel pipes have excellent strength but have poor fracture arrest. By finite-element analysis involving fluid-structure interaction (FSI) method, models of high-strength steel pipe with three kinds of defects (triangle, rectangle and semi-ellipse) were built to determine the concentrated stress based on…
The technique of chemical synthesis of metal ferrite nanoparticles in a porous filler structure is developed. It is shown that cobalt ferrite particles located in the pores of carbon weaken the electromagnetic radiation flow passing through a sample of composite material.
Based on the equation for the dependence of the glass-transition temperature vs. the cooling rate, the analogous dependence has been determined for the fraction of fluctuation volume, which is frozen at the glass-transition temperature. It has been shown that the constant ratio of empirical constants of the given equa…
A new concept of controlling magnetism in bulk ferromagnets via reversible lithium chemistry is illustrated. The approach bridges electrochemistry with magnetism and is pertinent to any volume of an intercalation-friendly ferromagnetic material. An iron oxide (maghemite) nanoparticle ensemble, chosen as a representati…
We conduct several experiments to further clarify the formation mechanism of a self-organized void array induced by a single laser beam, including energy-related experiments, refractive-index-contrast-related experiments, depth-related experiments, and effective-numerical-aperture experiment. These experiments indicat…
The calculation method of the scattering by a finite metamaterial rectangular plate is proposed. The surface current distributions are modeled for a transverse electric(TE) and transverse magnetic(TM) waves. The proposed method is numerically and experimentally verified by comparing the Radar Cross Section(RCS).
Thepaperpresents the design of a new micro-hotplate.Useplatinum filament as electrode material, Si and SiO2assubstrate materials.Through the structure optimizing analysis, the micro-hotplate owns the best temperature distribution, when the thickness of Si, the front and rear SiO2are set to 125, 25 and 150 μmrespective…
According to the experimental results of new type silicon magnetic sensitivity transistor (SMST), the simulation models of new type SMSTs with different base region lengths and widths were established by ATLAS software. The simulation results of optimizing the geometric parameters demonstrate that the max collector cu…
In this paper, the Back-Propagation neural network (BP network) and the establishment of the AZ61 magnesium alloy high temperature constitutive model and test data obtained for training the neural network, after training the neural network to become a knowledge-based constitutive model formed AZ61 magnesium alloy flow…