Materials Literature
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A classification is given for the classical allotropes of carbon in the context of atom hybridization and for nanocarbon, taking into account the molecularity, size, and shape of particles (fullerenes, nanotubes, nanoonions, and nanodiamonds). The structural features of different kinds of nanocarbons and their chemica…
Exchangeable Al has been used as a criterion for the calculation of lime requirement in several Brazilian States. However, the laboratory method with extraction by a 1 mol L-1 KCl solution followed by indirect alkaline titration is not accurate for some Brazilian soils, mainly in the case of soils with high organic ma…
Breast cancer is currently the most commonly diagnosed cancer in the UK. There are approximately 45,000 new cases each year, with one in nine women developing breast cancer at some point in their l...
The differential thermal analysis (DTA) is utilized to determine the phase boundary and phase equilibria of Co–Cu alloy having a miscibility gap. Regions for various phase i.e., spinodal and coherent binodal, peritectic, magnetic and the transformation from the two phases to α phase transformations are distinctly dete…
In this study, we use a freeze casting technique to construct ceramic-polymer composites in which the 2 phases are arranged in an electrically parallel configuration. By doing so, the composites exhibit dielectric constant (K) up to 2 orders of magnitude higher than that of composites with ceramic particles randomly d…
El mal manejo de los humedales de altura está conduciendo a un deterioro acelerado de estos ambientes dinámicos y frágiles. El objetivo de este trabajo es estudiar la abundancia, la biomasa y la diversidad de algunos componentes del fitoplancton de humedales altoandinos de la provincia de Jujuy, en relación a variable…
Transient space charge within polyethylene has been simulated based on a bipolar charge transport model with a constant mobility. Initial results are in good agreement with those previously reported. To further develop the model, two types of field-dependent carrier mobility: power-law mobility and Poole-Frenkel mobil…
The crystal structure of tschermakite from Fiskenaesset, Greenland, (K 0.05 Na 0.38 ) ∑0.43 (Ca 1.80 Na 0.05 Fe 2+ 0.15 ) ∑2.00 (Mg 3.65 Fe 2+ 0.18 Mn 0.03 Fe 3+ 0.09 Al 0.81 Cr 0.19 Ti 0.05 ) ∑5.00 (Si 6.43 Al 1.57 ) ∑8.00 O 22 [(OH) 1.95 F 0.04 Cl 0.01 ] ∑2.00 , a 9.8059(5), b 17.9721(8), c 5.3012(2) A, β 105.063(1)…
The internal reflection in gold nanocluster films in the Kretschmann geometry is studied using polarization modulation of electromagnetic radiation. The reflection coefficients R s and R p for s- and p-polarized light, respectively, as well as their difference ΔR = R s − R p , are measured as functions of the angle of…
The advantages of new simple-shear methods of severe plastic deformation (equal-channel multiple angular extrusion, T-type extrusion, and twist extrusion) are examined for polyamides from the viewpoint of the structural modification of flexible-chain semicrystalline polymers. The effect of the deformation scheme and m…
The magneto-optical properties of perforated metal-dielectric heterostructures that consist of a metal film perforated with a periodic system of slits and a dielectric layer magnetized in the plane have been investigated. The numerical simulation based on the rigorous coupled-wave analysis has revealed that, in these…
Transparent conductive Al-doped ZnO (AZO) thin films are prepared on normal glass substrates by the sol-gel spin coating method. The effects of drying conditions, annealing temperature and cooling rate on the structural, electrical and optical properties of AZO films are investigated by x-ray diffraction, scanning ele…
A state with spontaneous interlayer phase coherence in a bilayer quantum Hall system based on graphene is studied. This state can be regarded as a gas of superfluid electron–hole pairs whose components belong to different layers. A superfluid flow of such pairs is equivalent to two electric supercurrents in the layers…
Dielectric response measurement techniques in both time and frequency domains are studied in order to measure the dielectric loss of XLPE cables, which have very low losses. A high sensitivity transformer ratio bridge system, which can measure loss tangents as low as 10-5, has been developed with the ability to measur…
Oil-paper is the main insulation of Oil-immersed power transformers. Reflecting the deterioration of insulation effectively, partial discharge (PD) has become one of the significant means to estimate the insulation condition of power transformers. Surface discharge is one of the most important type of PD. Studying the…
The charge on a conducting particle in an infinite uniform field or standing on a ground plane in a uniform background field is important to a range of technical areas, such as particle motion in gas-insulated substations. This charge is normally evaluated based on an approximate formula which is often traced back to…
In this paper, we propose a statistical model to analyze the crosstalk noise induced by process variations on single-walled carbon nanotube (SWCNT). Our approach is based on a closed-form metric, which simplifies the noise peak voltage of SWCNT buses into a linear function of process variations. The methodology is bas…
Experimental results on photoluminescence spectra and kinetics obtained in the studies of SiO 2 oxide layers nanostructured by ion implantation of silicon with subsequent doping and annealing are systematized. It is shown that phosporus doping by ion implantation leads to a severalfold increase in the intensity and de…
The nanocrystalline Y 3 Al 5 O 12 ceramics with different phase compositions, microstructures, and optical characteristics have been prepared by low-temperature consolidation of the Y 3 Al 5 O 12 powder at pressures from 6 to 7.7 GPa in the temperature range from 250 to 550°C. The conditions have been defined for obta…
The effect of edge carbon atoms in graphene islands grown on a metal surface on the kinetics of nucleation, growth and dissolution of these islands, as well as of a multilayer graphite film, has been analyzed. It is shown that the part played by edge atoms should be taken into account in description of equilibrium pro…