Materials Literature
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Abstract In this article, the influences of five operating variables on the molecular weight (or K ‐value), polydispersity index (PDI), as well as polymerization yield of emulsion poly (vinyl chloride) in batch reactor were investigated simultaneously using Taguchi experimental design approach. The variables were temp…
In order to restrain ferroresonance in coupling capacitor voltage transformers (CCVT), three kinds of ferroresonance suppression circuits (FSCs): the resonant type, the fast-saturation reactor type and electronic type which are connected to secondary side of CCVTs, are proposed in this paper. Frequency domain analyses…
The application of voltage response measurement is a very effective tool to determine of the aging state of oil-paper insulated cables. The initial slope of the decay voltage is directly proportional to the conductivity of the insulation and the initial slope of the return voltage is proportional to the intensity of p…
Controllable reactor is an important voltage control and reactive power compensation device in power system which is wide range voltage application, high reliability, low harmonic and simple maintenance, etc. The reactor iron core magnetic field distribution directly affects the reactor's loss and other properties. In…
The luminescent properties, including cathodoluminescence and photoluminescence, of the erbium-doped yttrium oxide (Er3+:Y2O3) nanotubes (NTs) have been systematically studied. These NTs were synthesized by a hydrothermal treatment followed by a dehydration process. Cathodoluminescent measurements show that every Er3+…
The thermal conductivity of PCB structures variations according to the position of the metal layers as a function of the local copper contents and distribution are studied. The value of the parallel and serial thermal conductivity coefficient of PCB have been calculated by usage of the corresponding electrical analogs…
Precise measurements of the relative volume change of vitreous B 2 O 3 have been performed by the strain-gauge technique at hydrostatic pressures up to 9 GPa. The features of the strain-gauge technique are analyzed and the specificity of the measurements of “relaxed” and “unrelaxed” bulk moduli is discussed. Smeared a…
Zn O ∕ Cd x Zn 1 − x O double heterostructures grown on a-plane sapphire substrates by pulsed-laser deposition were investigated concerning their photoluminescence properties. The localization of excitons in the CdxZn1−xO alloys were studied and analyzed with temperature dependent photoluminescence measurements from T…
Using the first-principles methods, we study the formation energetics and charge doping properties of the extrinsic substitutional defects in kaolinite. Especially, we choose Be, Mg, Ca, Fe, Cr, Mn, Cu, Zn as extrinsic defects to substitute for Al atoms. By systematically calculating the impurity formation energies an…
Vibration characteristics of double-walled carbon nanotubes (DWCNTs) with conveying fluid are analyzed based on the Euler–Bernoulli beam theory and using the wave propagation approach. The DWCNTs are considered as two nanotube shells coupled through the van der Waals interaction between them. The influences of interna…
At ambient temperature, interaction of the solid radical anion salt [Na(15-crown-5)][C2N4S2] with water vapour unexpectedly leads to the trithionate salt [Na(15-crown-5)]2[S(SO3)2], whose coordination pattern is very different from the previously studied trithionate salts.
The constants of the phenomenological potential of SrTiO3 are calculated allowing for recent experimental data. The α11, α12, and t 44 constants are refined by more than one order of magnitude as compared to the earlier values. The T-P phase diagrams for the case of the uniaxial [001] and [110] loading are calculated.…
Tetragonal scheelite-type CaWO4 nanocrystals recently prepared by a hydrothermal method show an enhancement of its structural symmetry with the decrease in nanocrystal size. The analysis of the volume dependence of the structural parameters in CaWO4 nanocrystals with the help of ab initio total-energy calculations sho…
The results of an investigation on the electrical resistivity of carbon steels are presented, and mathematical models which take into account the effect of the nonlinearities of the temperature and carbon content are proposed. The result showed that the electrical resistivity had a strong carbon content dependence wit…
This paper has the purpose to address in a practical way the topic of PD testing HV cables, with emphasis on on-line measurements and diagnostic interpretations. For this purpose, FAQ are discussed and examples reported of advantages and limitations of on-line PD testing.
The low voltage scanning electron microscope (SEM) is widely used in many industrial and research applications due to its ability to image surface details and to minimize charging and beam damage effects on sensitive samples. However, fundamental limitations in beam performance have existed, most notably in the chroma…
Transparent conductive oxides (TCOs) are a unique class of materials that exhibit both low electrical resistivity and high optical transmittance. Al-doped ZnO thin films have the potential to replace the widely used TCO indium tin oxide at a fraction of the current cost. Thin ZnO:Al films have been deposited by rf mag…
Despite remarkable developments in vascular medicine in the last decades and intensive research on the improvement of bypass materials, an ideal bypass graft comparable to autologous veins or arteries is still not available for peripheral vascular and coronary artery bypass grafting. This article reviews established b…
Due to the photoelectric, semi-conducting and X-ray-sensing properties, selenium is an element of great economic potential. Since nanomaterials display special properties compared to bulk particles, the production of selenium nanostructures (wires, rods or spherical particles) has attracted much attention. In this stu…
The effects of dopant Pr and codopant Ga on the luminescence of BaTiO 3 phosphors have been investigated. The maximum luminescence intensity of red emission was observed at a Pr concentration of 0.011 mol %, which is a much lower concentration than those in previous reports on the luminescence characteristics of phosp…