Materials Literature
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The purpose of this study is to fabricate the tungsten trioxide (WO3) nano-rod (WNRs) films by hydrothermal process and investigate the relationship between microstructure morphologies and electrochromic properties. A WO3seed layer with monoclinic structure was deposited on a fluorine doped tin oxide (FTO) coated glas…
We demonstrate a new contact technology for realizing a near band edge contact Schottky barrier height (ΦB) in black phosphorus (BP) p-channel transistors. This is achieved via the use of high work function nickel (Ni) and thermal anneal to produce a novel nickel-phosphide (Ni2P) alloy which enables a record low hole…
First principles density functional theory calculations within the generalized gradient approximation are performed to comprehensively study the structural, elastic, electronic and thermodynamic properties of triclinic single and polycrystalline Cu7In3. The polycrystalline elastic properties are predicted using the Vo…
In this work, a new approach to chemically dope black phosphorus (BP) is presented which significantly enhances device performance of few-layer BP field-effect transistors (FETs). By applying 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ), low on-state resistance and high field-effect mobility are achi…
Compatibility between solid and liquid electrical insulation materials has been studied using an isothermal microcalorimeter. This work compares the micro-calorimeter measurements with a simple volume and mass increase for the solid material also capable of indicating incompatibility and compatibility in some cases. T…
This paper proposes a new frequency selective surface (FSS) based on the combination of four sinusoidal-waveform like shapes, each formed by the combination of two semi-circles, for an overall arrangement similar to a square shape. The proposed design was simulated and evaluated through a commercial electromagnetic (E…
This paper discusses the effects of varying the design parameters of the cavity or rectangular aperture in the frequency selective surface (FSS) of a Fabry-Perot Cavity (FPC) antenna system. The FPC system is excited by a coplanar-waveguide (CPW)-fed slot antenna. Theoretical results of the near-field distribution and…
In this work we present a novel substrate-superstrate leaky-wave THz antenna loaded with an electrostatically biased graphene sheet within the substrate. The graphene sheet position is shown to significantly affect the dispersion and radiation properties of the fundamental leaky modes supported by the structure. An op…
Water jet looms are widely used in woven fabric manufacturing especially for synthetic fabric production. Due to massive growth in synthetic fabric production, the significance of the water jet loom becomes dominant Due to its salient features such as high production speed, low energy consumption, low noise emission,…
Transfer-free graphene on SiO2has been produced by catalytic chemical vapor deposition (CCVD) using an additional PMMA carbon source. During our CCVD process the graphene grows laterally, extending beyond prestructured metal catalyst perimeters, covering part of the SiO2surface. The such grown graphene has been invest…
This paper describes a novel ST-cut quartz (ST-quartz)/LiTaO3(LT) direct bonding for surface acoustic wave (SAW) devices of next 5G mobile communication. The ST-quartz and LT were bonded to fabricate temperature compensated piezoelectric substrates using amorphous SiO2(α-SiO2) intermediate layers. The α-SiO2thin layer…
In order to use coal tar pitch (CTP) as a raw material for carbon fibers, it should have suitable properties such as a narrow range of softening point, suitable viscosity and uniform optical properties. In this study, raw CTP was modified by heat treatment with three types of polymer additives (PS, PET, and PVC) to ma…
This paper proposes a reflectarray unit cell for enabling an analog row-column beam scanning control in order to reduce the required number of control lines from N*M to N+M, being N*M the size of the array. First, the row-column control scheme is reviewed, and after discarding a digital implementation with aggressive…
Contaminant composition affects the discharge characteristics of external insulation. This paper studies the intense discharge phenomenon at low relative humidity (77%) in an AC 500 kV substation in Southern China. Due to farming and the soil feature in the sugar cane field around the substation, aluminum phosphate is…
Experiments to simulate wear process of fuel cladding in case its contact with spacing grid. System «sphere-plane» selected as friction pair. Tubular parts of fuel claddings from E110 alloy diameter of 9.15 mm and length of 50 mm (wall thickness 1 mm) were used for investigations. Some claddings were subjected to ion…
Mixed oxides of Ti-V-O were co-precipitated by wet process using TiCl4 and VOCl3 as starting materials. As-precipitated gels were calcinated at 800 C for 4 hours in oxygen atmosphere. Effects of vanadium content on the structural evolution, morphology, and band gap of Ti-V-O oxides were investigated. Calcination has p…
The waveguide technique for measuring the absorption spectra of thin films in spectral range of their transparency is considered. The error of measuring the absorption of a ∼0.1 μm thick film does not exceed 5% at an absorption coefficient of less than 50 cm –1 . Capabilities and limitations of the method are discusse…
The influence of copper doping (25 at. %) upon the structural and phase transformations of triple alloys of the TiNi–TiCu quasi-binary cut is studied by transmission and scanning electron microscopy and electron and X-ray diffraction. A generalized complete diagram of B 2 ↔ B 19′, B 2 ↔ B 19 ↔ B 19′, and B 2 ↔ B 19 th…
In this research, we investigated the growth mechanism of cobalt-doped titanium dioxide (Co:TiO 2 ) films. Thi Co:TiO 2 thin films were grown on the n-type silicon substrate. The films were grown by metal organic chemical vapor deposition method. The growth temperature was varied of 325°C – 450°C. The films were chara…
In this work, we present an atomistic model to simulate the structural and some thermodynamic properties of biomaterials as a test case of grossular glass-ceramics. The potential model used in our simulations included short range Born-Mayer type forces and long-range Coulomb interactions. We modelled the atomistic str…