Materials Literature
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Polymethylmethacrylate (PMMA)/polyethylene glycol (PEG) copolymers were synthesised by the radical grafted polymerisation technique under mild conditions with the PEG molar content of 8, 10 and 12% respectively. Prepared by spin coating method, the surface structures of PMMA/PEG copolymer coatings were studied by atom…
The peritectic alloys, such as some types of steel, Ni-Al, Fe-Ni, Ti-Al, Cu-Sn, are commercially important. In contrast to other types of alloys, many unique structures (e.g. banded or island ones) can form when peritectic alloys are directionally solidified under various solidification conditions. It can be observed…
The synthesis of dimethyl ether via methanol dehydration has been carried out over untreated-diatomite catalyst (DM) and hydrochloric acid modified treatment on diatomite catalyst (DMHC). The reactions were carried out in a fixed-bed reactor. The effects of hydrochloric acid modifications of diatomite on its catalytic…
Building new infrastructures such as power plants, substations and transmission lines to meet rapid demand growth has becoming more challenging than ever. This is mainly due to economic factor but more importantly is public acceptance. Consequently, transmission grid operation is stressed to the limit and poses signif…
The concentration dependence of the degree of association of zinc and aluminum phthalocyanines in supramolecular systems is determined. Complexes containing rare photoactive associates with an absorption maximum significantly shifted to longer wavelengths are obtained. The radiative lifetimes, extinction coefficients,…
In this work, we have developed an ion exchange reaction to fabricate homogeneously distributed CdS nanoparticles with a size in the range of 20–120 nm in the sulphonated poly(ether ether ketone) (SPEEK) membrane. The chemical composition of the composite membrane was characterised by ultraviolet-visible (UV-vis) spec…
The possibilities of a new method of growing gallium nitride nano- and microwire crystals using continuous titanium films with a thickness of 10–30 nm during growth are described. It is shown that this method can provide growth of high-quality GaN nanowire crystals at an extremely high rate of about 10 μm/min.
Bismuth silicate (Bi4Si3O12, BSO) and bismuth silicate–germanate (Bi4Si3(1−x)Ge3xO12, BSGO) crystals were grown with the modified Bridgman technique. The fluorescence and thermoluminescence (TL) of the crystals were investigated. An additional excitation peak around 297 nm was found in the fluorescence excitation spec…
Six topological structures (an amorphous and five crystalline blocks) have been detected in a polytetrafluoroethylene film with a pseudo-network structure. During the Γ-irradiation of the polymer in air, the crystalline fractions degrade and gradually convert into amorphous and cluster states with the increasing radia…
Summary Polyaniline was synthesized by using weak oxidizing agent CuCl2 and characterized with FTIR, UV‐vis, and XPS spectroscopic techniques. The composition of products was calculated from elemental analysis. The results show the presence of polyaniline in the emeraldine base (EB) form doped with [CuCl4]−. An increa…
The crystal structure of fornacite Pb2(Cu,Fe)[CrO4(As,P)O4OH] from the Berezovskii deposit (Central Urals, Russia) was refined by X-ray powder diffraction data using the Rietveld method. Fornacite is monoclinic, space group P21/c, the unit cell dimensions are a = 8.09015(12), b = 5.90913(9), c = 17.4839(2) Å, β = 109.…
Methods of measuring the thermal impedance of Metal Core PCBs are analyzed. The ASTM D5470 method can measure the thermal conductivity of the insulated layer of MCPCBs, but cannot distinguish the contacting thermal resistance, which introduced during the measuring, and the boundary thermal resistance, arising from the…
Because some composite insulators run certain number of years and tends to exist insulation breakdown performance degradation issues, and some even mass incidents have occurred, affecting the normal operation of the grid. First introduced X-ray inspection systems, then introduction common failure and the reason of com…
The paper presents some problems and solutions for instantaneous power theory applied to active power conditioning under distorted mains voltages in a MATLAB/Simulink approach. Simulation of a real system is made, namely a transformer which feeds a controlled rectifier bridge in an excitation system from a power syste…
Effects of thermal annealing on the structural and optical properties of thermally evaporated CdTe thin films are presented here. Thin films of CdTe were deposited on soda lime glass substrates at room temperature by varying the deposition current ranging from 25 Amperes to 30 Amperes by thermal evaporation. The grown…
Because the geodesic pathways that a liquid follows through its potential energy landscape govern its slow, diffusive motion, we suggest that these pathways are logical candidates for the title of a liquid's "inherent dynamics." Like their namesake "inherent structures," these objects are simply features of the system…
We present an experimental study of thermal conduction in 1 µm thick suspended CVD diamond film by time-domain thermoreflectance (TDTR), an optical pump-probe technique. Important aspects of signal analysis and measurement sensitivity are discussed, outlining the various thermal metrology challenges posed by this syst…
Cu oxide/polyvinyl alcohol (PVA) nanofibers were synthesized by sol–gel and electrospinning technique. The obtained Cu oxide/PVA nanofibers were heated to remove the PVA compound at 673 and 873 K. The ultrafine Cu oxide nanofibers were characterized with scanning electron microscopy (SEM), transmission electron micros…
This paper presents a 270-V, 56-A GaN power module with three AlN substrates are prepared for the module. Each substrate is composed of three parallel connected GaN chips which incorporates six 2-A AlGaN/GaN-on-Si high electron mobility transistors (HEMTs) cells. The devices are wire-bonded in parallel connection to i…
Single γ-phase In2Se3 films were prepared by using metal-organic chemical-vapor deposition(MOCVD) with a single-source precursor [(Me)2In(μ-SeMe)]2. The basic physical properties of the grown films were examined by using X-ray diffraction, Raman spectroscopy, and photoluminescence spectroscopy at room temperature. The…