Materials Literature
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During service, corona discharge could arise on outdoor composite insulators under wet conditions and its intensity can be accelerated at high altitude due to low air pressure. This phenomenon reduces the surface hydrophobic characteristics. In this paper, AC corona aging studies are carried out on silicone rubber (SR…
Potassium is a nutrient found at low levels in Brazilian soils, requiring large inputs of fertilizers to achieve satisfactory crop yields. Brazil has high external dependence and limited reserves of soluble K mineral, which is traditionally exploited for the production of fertilizers. On the other hand, it is common t…
The melt flow behavior of high density polyethylene (HDPE) and its nanocomposites with different kinds of nanofillers (kaolin, bentone, sodium montmorillonite (Na-MMT) clay, carbon nanotubes, graphene oxide (GO) and carbon black) is assessed. The dimensional effect (1D, 2D and 3D) of nanofillers on the melt flow singu…
This study discusses the effect of welding heat input on intergranular corrosion of the weld metal of Inconel 625 alloy. A specimen of Inconel 625 overlay with a weld metal that controlled welding heat input was manufactured, and aging heat treatment was conducted to investigate sensitization by chromium carbides. The…
Using an in situ electrical method and the multi-anvil apparatus, we determined the melting curve of sodium chloride (NaC1) up to ~20 GPa, with an estimated uncertainty of ±40 K. Our results agree well with the existing data up to 6.5 GPa. At higher pressures, the melting temperatures from this study are as much as 20…
Summary In this study, physical properties of glycidyl methacrylate grafted polylactic acid (PLA‐g‐GMA) were studied and compared with those of polylactic acid (PLA). PLA‐g‐GMA was prepared by using an internal mixer. Differences in crystallization characteristics between PLA‐g‐GMA and PLA were observed from X‐ray dif…
Partial discharge (PD) measurement is a widely extended technique for the diagnosis of electrical machines and power cables. Since PD and noise recognition is really important in industrial environments, the authors proposed the use of the spectral Power Ratios (PR) of the detected high-frequency (HF) signals, which s…
Summary Succinyl‐Chitosan (SCS), a water soluble CS derivative, exhibits biocompatibility, low toxicity and long‐term retention in the body. SCS offers unique characteristics as polymer for obtaining drug delivery nanosystems, due to its many reactive amino, hydroxyl, and carboxylic acid pendant groups. Chemical modif…
Abstract For the first time, the application of microreactors as a tool for acquiring kinetic data on a photochemical reaction is demonstrated. For illustration, a T‐photochromic system is considered. By using modeling tools and carrying out specific experiments in a spiral‐shaped microreactor irradiated by an ultravi…
Pollution flashover has been a serious threat to the operation safety for the power system. Online monitoring is one most important way for the operation and maintenance of power system. The leakage current on insulator surface is a comprehensive reflection of the insulator surface contamination, environmental conditi…
Graphene and thin graphite films deposited on SiO 2 /Si are irradiated by swift heavy ions ( 209 Bi, 9.5 MeV/u) with the fluences in a range of 10 11 ions/cm 2 –10 12 ions/cm 2 at room temperature. Both pristine and irradiated samples are investigated by Raman spectroscopy. For pristine graphite films, the "blue shift…
Changes in chemical, microstructural, and barrier properties of two commonly used and commercially available waxes – a microcrystalline wax (Renaissance wax) and a microcrystalline and carnauba blended wax (Butcher's Boston Polish Amber Paste Wax) – for the prevention of corrosion on outdoor metalwork were investigate…
Summary In this study, cassava pulp (CP) was used to prepare cellulose nanofibers. CP was treated with sodium hydroxide and then bleached by sodium chlorite solution in acetate buffer solution. Finally, acid hydrolysis treatment was conducted by using two different acid type (H 2 SO 4 and HCl). The morphological struc…
Transient multiphysics simulations are performed to investigate the thermal and electric performance of a thermoelectric generator (TEG) module placed between hot and cold blocks. Effects of heat radiation, thermal and electric contact on the TEG are examined and the simulated results are compared with experimental da…
Silicene, a newly isolated silicon allotrope with a two-dimensional (2D) honeycomb lattice structure, is predicted to have electronic properties similar to those of graphene, including the existence of signature Dirac fermions. Furthermore, the strong spin–orbit interaction of Si atoms potentially makes silicene an ex…
Materials based on layered calcium (Ca3Co4O9 + δ) and calcium-bismuth (Bi2Ca2Co1.7O y ) cobaltites were derived based on a technique of solid-phase reactions. Their thermal expansion, electrical conductivity, and thermoelectric power were found. It was demonstrated that these materials are p-type semiconductors with a…
We investigate Ti/Au contacts to monolayer epitaxial graphene on SiC (0001) for applications in quantum resistance metrology. Using three-terminal measurements in the quantum Hall regime we observed variations in contact resistances ranging from a minimal value of 0.6 Ω up to 11 kΩ. We identify a major source of high-…
Logically, the surface chemistry of filler particles must be a key factor that governs how they interact with a polymer matrix, determining for example, how strongly the particles are bound into the matrix and how easy or difficult it is to achieve a homogenous dispersion of filler particles. This second point is sure…
We analyze the possibility of obtaining M-type hexagonal ferrites of barium, strontium, and lead with multiferroid properties with the help of ceramic technology. Using the modified ceramic technology (especially pure initial raw materials, admixture of B 2 O 3 , and sintering in the oxygen atmosphere), we obtained fo…
Abstract A piezoelectric beam model with strain gradient and electric gradient effects is proposed. An energy variational principle with strain, strain gradient, electric field, and electric field gradient considered as independent variables is postulated to develop the governing equations and boundary conditions. Mor…