Materials Literature
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In order to reduce the high electric field peak near the gate edge and optimize the non-uniform surface electric field distribution of conventional AlGaN/GaN high electron mobility transistor (HEMT), a novel AlGaN/GaN HEMT with a partial GaN cap layer is proposed in this paper. The partial GaN cap layer is introduced…
Free-surface liquid metal flows tend to be uneven due to instabilities and other effects. Some applications, however, require constant, uniform liquid metal thickness. This is for example the case of liquid walls in nuclear fusion reactors. With this motivation, here we present experimental results on the stabilizatio…
In this paper, we consider two new subclasses consisting of analytic and m-fold symmetric bi-univalent functions in the open unit disk. Also, we establish bounds for the coefficients for these subclasses and several related classes are considered and connections to earlier known results are made.
In this work, several nanostructures (nanopowders and nanostars) of undoped and 1%, 3% and 5% europium (Eu3+)-doped ZnO have been synthesized via coprecipitation method using oxalic acid and sodium hydroxide as precipitation agents. Starting from zinc acetate and europium acetate, nanopowders were obtained by coprecip…
In this paper, different rubber compounds were prepared by usingSMR-20 type of natural rubber (NR) and SBR-1502 type of styrene-butadiene rubber. The effect of blend ratio on the curing parameters, mechanical and electrical properties of NR/SBR blends have been studied. It was found that the increment of NR percentage…
We investigate the defect structures around a spherical colloidal particle in a cholesteric liquid crystal using spectral method, which is specially devised to cope with the inhomogeneity of the cholesteric at infinity. We pay particular attention to the cholesteric counterparts of nematic metastable configurations. W…
The microstructure and hardness of the weld joints of DOMEX 700 steel were investigated. As a result, the optimization of the parameters of robotic arc welding in the environment of protective gases was carried out taking into account the size of the energy per unit length. The optimum modes of welding were determined…
Synchrotron light sources generate intense beams of X-ray light for beamline experiments, and the stability of these X-ray beams has a large impact on the quality of the experiments that can be performed. User experiments increasingly utilise micro-focus techniques, focusing the X-ray beam size to below 10 microns at…
The phase formation of Ti–Al–C powder mixtures with compositions close to the composition of the MAX phases in self-propagating high-temperature synthesis (SHS) was investigated using time resolved X-ray diffraction. It is found that material formation during combustion in air under low heat removal rates is a staged…
Recent advances in metamaterials enable us to create unprecedented optical materials, and as a example of such materials, perfect absorptive material surfaces within a certain frequency range were demonstrated. Since the metamaterial absorber offers a unique surface condition with tailored absorption properties, a wid…
This work develops a quantitative process to sinter functionally graded materials (FGMs) to specific porosity gradients using Spark Plasma Sintering (SPS). The powder densification in SPS is modeled using the Master Sintering Curve (MSC) calculated from shrinkage due to three different heating rates. The meaning of th…
In this study, an amperometric non-enzymatic glucose sensor was developed on the surface of a glassy carbon electrode by simply drop-casting the synthesized homogeneous suspension of hexagonal boron nitride (h-BN) nanosheets with a copper metal-organic framework (Cu-MOF) composite. Comprehensive analytical methods, in…
Low-voltage scanning electron microscopy (LV-SEM), imaging and energy dispersive x-ray spectroscopy (EDX) analysis, have been applied to steel surfaces in order to clarify the performance of these techniques as a surface analysis. The information depth of LV-SEM imaging is limited by the penetration range of primary e…
It has been suggested that the prismatic block type Fluoride-salt-cooled High temperature Reactors (FHRs) can benefit from Advanced Gas-cooled Reactors (AGRs) technologies.1 This paper contributes to the global FHR development effort by investigating an AGR-like FHR concept. A reference FHR assembly design is proposed…
Conventional coating methods are currently being challenged by newly developed technologies that can result in products with interesting properties and competitive prices. Versatile foam coating is one such promising technology. Foam coating is carried out using different foam application methods, and the viscoelastic…
The aim of this work is to analyze the time behavior of different species and their reaction rates using a zero-dimensional model based on chemical kinetic equations. The considered model is able to describe the behavior of twenty different chemical species participating in one hundred selected chemical reactions. In…
This work explores the effectiveness of nanoclay (NC) as compatibilizer in graphene oxide (GO) reinforced Nylon66 (N66) nanocomposites, prepared through melt mixing technique. Different composites have been prepared with varying concentration of NC to determine its optimum content for an effective improvement in therm…
The aim of this work is to explore the compatibility and thermal stability of 2, 4, 6, 8, 10, 12-hexanitro-2, 4, 6, 8, 10, 12-hexaazaisowurtzitane (CL-20) with several plasticizers via differential scanning calorimetry (DSC) and vacuum stability test (VST), for development and optimization of CL-20 based mixed explosi…
Cu-Zn-based brasses possess excellent strength and corrosion resistance. However, producing bulk brass parts/bodies via conventional powder metallurgy has been difficult due to the high vapor pressure of Zn. This problem is circumvented in Cold Spray, in which solid powder particles, accelerated in a supersonic gas st…
The matrizer method is applied to obtain equations of the wave vector surface and phase velocity magnitude for electromagnetic waves in anisotropic media with rhombic symmetry. Angles of refraction of electromagnetic waves at the interface of anisotropic media are determined, generalizing the Snell law for isotropic o…