Materials Literature
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A dual-resonant quad-layer transmitarray element is proposed in this paper. The element can be used to construct a circularly polarized transmitarray which converts linearly polarized incident wave into circularly polarized outgoing wave. The element operates at 30GHz and is designed through the principle of multilaye…
The influence of AlGaAs-based distributed Bragg reflector (DBR) on the performance of a GaInNAs n-i-p solar cells is reported. The DBR increased the short circuit current density by ~1 mA/cm2, owing to increased external quantum efficiency in the wavelength range from 1120 nm to 1240 nm. As a result of the incorporati…
We propose a new surface passivation material for crystalline silicon solar cells, namely atomic layer deposited aluminium nitride (ALD AlN). AlN has multiple benefits as compared to more commonly used Al2O3, i.e. it has better optical properties, higher hydrogen concentration and better suitability for phosphorous em…
A dipole-based simulation method is presented to study the effects of edges on finite metasurfaces. This technique can accurately account for the physical limitations associated with fabrication and thereby leads to high fidelity predictions needed in practical applications. Moreover, it establishes a platform to impr…
A tunable metasurface unit cell that is based on counter-rotating end-loaded dipole (ELD) elements is proposed for high-power reflector antennas. The metasurface is tuned by mechanically rotating the ELD elements and thus avoids the power handling limitations of tunable capacitors such as varactors. Simulations of the…
In this paper, we propose the design of a new bandpass frequency selective surface (FSS) with tightly coupled elements for ultra-wideband (UWB) applications. The proposed FSS is constituted of two layers, of periodic array of crossed metallic tapered dipoles, separated by a ground plane and connected via twin wire tra…
Stable nitrogen doping is an important issue in p-type ZnO research for device applications. In this paper, beryllium and magnesium are systematically compared as a dopant in ZnO to reveal their nitrogen-stabilizing ability. Secondary ion mass spectrum shows that Be and Mg can both enhance the stability of nitrogen in…
In this paper, we present a detailed study on surface nanostructuration oforiented p-type Silicon using a Cu assisted chemical etching. Scanning Electron Microscopy was used to describe the evolution of the surface morphology and structures during etching. The results show that the formation of either pyramids or inve…
This article consists of a collection of slides from the author's conference presentation. It is concluded that individual component liquid cooling offers the lowest weight solution that will be attractive to airborne hardware electronics industry.
In order to implement the test method to detect winding deformation excited by pseudorandom binary M-Sequences (The M-Sequence method), a detecting instrument for winding deformation synthetically based on the M-Sequence method and Frequency Response Analysis (FRA) is developed. Three kinds of the artificial failures…
Here, we report the formation of two-dimensional electron gas (2DEG) in MgZnO/ZnO heterostructures grown by dual-ion beam sputtering system. Room-temperature 2DEG density and hall mobility are measured with varying Mg concentration in the barrier layer (5, 15, 20, and 30 at.%). 2DEG density and hall mobility are obser…
Ice coatings on power transmission lines (PTSs) are detected during location probing from the amplitude reduction and the increase of propagation (delay) time of the reflected signals. The stability of the amplitude and delay of the reflected signals in the normal conditions in the absence of glaze ice and the limitin…
Background: Poly(amidoamine) (PAMAM) dendrimer derivatives have been investigated for their biological applications, especially for delivery of drugs, including antimicrobial drugs to eukaryotic cells, but their effects on bacterial cells are largely unexplored. Nanotechnology and its application is one of the rapidly…
We report monolithic, electrically-pumped tunable 1060-nm VCSELs with a high-contrast grating metastructure as the highly reflective tunable mirror. Single-mode lasing with CW operation is demonstrated up to 85°C providing output power larger than 1.3 mW at room temperature. A continuous tuning range of 35 nm is achie…
The electrical properties of the 0.925(Bi0.5(Na0.40K0.10)TiO3-0.075(Ba0.70Sr0.30)TiO3 (0.925BNKT-0.075BST) ceramic were investigated by using AC impedance spectroscopy over a wide range of frequencies (10 −2 ~ 105 Hz). The X-ray diffraction patterns confirmed the formation of a single-phase compound. A single semicirc…
Abstract Polyhydroxyalcanoates (PHAs) are specifically produced by a wide variety of bacteria, as an intracellular energy reserve in the form of homo- and copolymers of [R]-β-hydroxyalkanoic acids, depending on the C source used for microorganism growth, when the cells are grown under stressing conditions. In this pap…
Models of partial discharge (PD) activity have been used to successfully replicate PD data from experiments under controlled conditions. These experiments have typically investigated PD activity from an artificial defect, often a gaseous void, surrounded by a homogeneous dielectric material in a parallel plate electro…
This paper reports the effect of varying polymer concentration i.e. solvent/polymer ratio on the morphology and gas transport behaviour of polyethersulfone/polyvinyl acetate blend membrane. The solvent used was dimethylformamide, while the manipulated variable was polymer concentration. The concentrations were varied…
Abstract This paper concerns the problem of designing an EID-based robust output-feedback modified repetitive-control system (ROFMRCS) that provides satisfactory aperiodic-disturbance rejection performance for a class of plants with time-varying structured uncertainties. An equivalent-input-disturbance (EID) estimator…
The Li, Ta, and Sb-substituted lead-free (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3 (KNLNTS) thin films were fabricated on Pt(111)/TiO2/SiO2/Si substrates using the radio frequency (RF) magnetron sputtering method. The KNLNTS thin films were annealed at 750 ◦C for 1 h in an oxygen ambient. The film with a thickness of…