Materials Literature
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Epoxy resin is one of the most widely used thermosetting polymers and commonly applied in electrical power engineering. The intrinsic properties of epoxy can be improved by the introduction of inorganic filler, thus fabricating a composite material. In this study we investigate the influence of the filler size and its…
An experimental study was conducted, using a Rotating Wheel Tracking and Erosion Tester (RWT) with the aim to compare the aging performance of different insulators under AC and DC (both polarities) excitation. The procedures of the standard were adapted to perform AC and DC (both polarities) tests on 6 practical insul…
In this study, the influence of insulating barriers on the breakdown voltage of air in non-uniform field is experimentally and theoretically investigated. Tests were conducted in order to determine the positive and negative DC breakdown voltage of small air gaps (up to 50 mm) formed by energized rod and grounded plane…
Ag dendritic nanostructures were synthesized on fluorine-doped tin oxide covered glass substrates by the electrodeposition method. Results demonstrate that the size, diameter, crystallinity, and branch density of the Ag dendrites can be controlled by the applied potential, the surfactants and the concentration of AgNO…
Abstract Kerimasite, ideally is a new calcium zirconium silicate-ferrite member of the garnet group from the extinct nephelinitic volcano Kerimasi and surrounding explosion craters in northern Tanzania. The mineral occurs as subhedral crystals up to 100 μm in size in calcite carbonatites, and as euhedral to subhedral…
Abstract The effect of Rh dispersion on reforming of CH 4 with CO 2 over H‐Beta supported Rh catalysts has been investigated. The CH 4 and CO 2 conversion over the catalysts increase with increasing Rh loading from 0.5 wt% to 4.0 wt% in the reaction temperature range of 823–1123 K. The high TOF of CH 4 over 0.5 wt% an…
Results of a thermal study of calcium peroxide subjected to a mechanical treatment in a disintegrator are presented.
We have realized high-performance p- and n-type top-gate carbon nanotube field-effect transistors (CNFETs) by controlling the charges introduced at the interface between the gate insulator and the substrate. We also fabricated a complementary metal–oxide–semiconductor (CMOS) inverter on an individual single-walled car…
Cylindrical and conical micro- and nanowires were fabricated by matrix (template) synthesis in pores of track membranes. A technique for filling matrix pores with metal (copper, nickel, and silver) was developed. Desorption/ionization of biological molecules from metal micro- and nanowires was experimentally studied.
High-performance polymers based on aromatic rings are desirable not only because of the high primary bond strengths, but also because their rigid (stiff) polymer chains offer increased resistance to deformation and thermal softening. The choice of s-triazine nucleus is based on its high thermal stability derived from…
We present studies on the analysis and characterization of a unique nanosurface used for Surface-Enhanced Raman Spectroscopy. The optical properties of a nanostructure composed of dielectric pillars that support plasmonic nanoparticles have been investigated. A theoretical analysis has been performed to determine the…
Atomic force microscopy (AFM) study is used to measure the surface topology and roughness of radial and capture spider silks on the micro- and nanoscale. This is done for silks of the orb weaver spider Argiope keyserlingi. Capture silk has a surface roughness that is five times less than that for radial silk. The capt…
Linear and nonlinear optical properties of a spontaneously grown non-centrosymmetric crystal of guanylurea(1+) hydrogen phosphite (GUHP) were investigated. Optically negative biaxial crystals of GUHP exhibit a birefringence higher than calcite. Highly anisotropic refractive indices of GUHP and its nonlinear optical co…
Glasses of composition 80TeO 2-(20�x)ZnO-xNaF mol % were prepared by melt quenching technique and characterized by ESR, optical absorption and infrared spectroscopy. The IR spectra reveal that the glass consists of TeO 3, TeO 4, Te(O,F) 3 and Te(O,F) 4 units as local structure of the glass network. The hydroxyl group…
Abstract The structures and electronic, elastic and transport properties of the one‐dimensional coplanar polymers constructed by sharing pentagons or hexagons of C 36 cages are investigated using a self‐consistent field crystal orbital method based on density functional theory. It is found that these C 36 coplanar pol…
The onion-like carbon (OLC) was synthesised by annealing the nanodiamond fabricated by detonation for 1 h at the temperature of 1150°C in the low vacuum of 2 Pa. The OLC particles were characterised using a high-resolution transmission electron microscope (HRTEM) for observing its microstructure, an X-ray diffractomet…
In nuclear fusion experiments, the plasma facing components are exposed to high heat fluxes and infrared (IR) imaging diagnostics are routinely used for surveying their surface temperature for preventing damages. However the future use of metallic components in the ITER tokamak adds complications in temperature estima…
Loricate choanoflagellates (unicellular, eukaryotic flagellates; phylum Choanozoa) synthesize a basket-like siliceous lorica reinforced by costal strips (diameter of approximately 100 nm and length of 3 μm). In the present study, the composition of these siliceous costal strips is described, using Stephanoeca diplocos…
Carbon nanotubes (CNTs ) are considered to be one of the novel reinforcement for developing advanced nanocomposites due to their outstanding thermo-mechanical properties. Multi-walled carbon nanotubes (MWCNTs ) are developed by arc discharge method. To enhance the dispersion of CNTs in polymer matrix, CNTs are modifie…
The Escherichia coli genes pta and eutD encode proteins containing the phosphate-acetyltransferase domain. EutD is composed only by this domain and belongs to the ethanolamine operon. This enzyme has not been characterized yet, and its relationship to the multimodular E. coli phosphotransacetylase (Pta) remains unclea…