Materials Literature
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The paper presents results of TEM and XRD investigations of Elektron 21 magnesium alloy in as cast condition and after long-term annealing at 250 and 350°C. In as cast condition Elektron 21 consists of primary α-Mg solid solution with α-Mg-Mg3RE eutectic and regular precipitates of MgRE3. Precipitation at 250 °C cause…
Nonstoichiometric samarium, europium, ytterbium, and thulium fluorides were prepared by reduction of the corresponding trifluorides with the same lanthanide metal or silicon. Crystal lattice type and lattice parameters of the compounds were determined by powder X-ray diffraction. In the synthesis of ytterbium fluoride…
Barkhausen noise (BN) is widely used as a quality control method for grinding burn detection in ferromagnetic materials such as the case-hardened steels used in gears. The study of grinding burns with BN equipment requires, however, a calibration reference sample with a known BN response. The demand for better calibra…
Zinc oxide (ZnO) is semiconductor with a wide band gap of 3.4 eV. It continues to gain more attention not only for its versatile use in industry but also its potential for further application in electronics, optics, spintronics, and transparent circuits. Many of these applications require p-type ZnO. Nitrogen substitu…
The water tree resistance of chemically crosslinked polyethylene and of low density polyethylene were compared in order to elucidate whether the crosslinking itself influences or not the water tree characteristics of polymeric cable insulation materials. For this purpose, water trees were grown in compression moulded…
Transmission electron microscopy, Raman scattering, Fourier transform infrared spectroscopy, and radio-luminescence are employed to investigate rare-earth (RE) incorporation and aggregate formation in silica glasses prepared by the Sol-Gel method and doped with Ce$^{3+}$, or Tb$^{3+}$, Gd$^{3+}$, Yb$^{3+}$with concent…
Conventional thermoset materials, such as epoxy, polyester, silicone and polyurethane, have relatively high dielectric losses and high dielectric constants, which are not desirable for a high frequency and high voltage application. Polydicyclopentadiene (PDCPD) is a polyolefinic thermoset material that has outstanding…
After decades of research in insulation systems, little has been published in the area of analyzing the graph of resistance versus time. Plotting the Insulation Resistance versus Time, gives a graph which may be referred to as an “Insulation Resistance Profile” or IRP. In addition to the standard Insulation Resistance…
Power cables as one of main components of power networks, play an important role in electric power transmission between different zones. Because of probable incidence of water tree phenomena, air cavity and also humidity in electric insulators, increase in electric field happens locally and can lead to breakdown in in…
The eggs of Aedes scapularis analyzed by scanning electron microscopy are black and elliptical in outline, measuring approximately 620.4 +/- 16.74 microm long and 163.7 +/- 16.90 microm (n = 10) wide, with an egg index (length/width ratio) of 3.79. The anterior extremity tapered abruptly from a width of 51.6 microm, w…
An analytic expression for π and π* electronic structure of graphene is derived within the tight-binding approximation. Including up to fifth-nearest neighbors, the tight-binding description of electronic dispersion quite accurately reproduces the first-principle calculation result over the entire Brillouin zone. The…
We report that porous anodic alumina (aluminum oxide: Al2O3) (PAA) thin films directly grown on Si show clear oscillations in their photoluminescence (PL) spectra which are ascribed to PL-induced interferences within the Fabry–Pérot optical cavity formed by the PAA film on Si, that involve the air/oxide and oxide/Si i…
Using grand-canonical Monte Carlo simulations we investigate the impact of charged walls on the crystallization properties of charged colloidal suspensions confined between these walls. The investigations are based on an effective model focussing on the colloids alone. Our results demonstrate that the fluid-wall inter…
An analysis of compression isotherms of floating layers of copper tetra-tert-butylphthalocyanine ( CuPctBu4 ) and copper tetrabenzotriazaporphyrine, obtained at varied initial conditions, is carried out. The structure of layers is determined by three methods: the traditional one (direct estimation of area per molecule…
Ultracapacitors have numerous advantages including remarkably high energy density as compared with conventional capacitors, long life cycle, temperature stability, and require no maintenance, which make them a good candidate to replace batteries as energy storage devices in renewable energy applications. However, ultr…
Combining solid oxide fuel cell and gas turbine (SOFC/GT) system is a promising concept for future clean and efficient power generation. An SOFC/GT system exploits the complementary features of the two power plants, where the GT recuperates the energy in the SOFC exhaust stream and thereby boosting the overall system…
The effect of the oxidation temperature of UO2 pellets on the powder properties of oxidized U3O8 powders has been investigated. The powder morphology, crystalline size, and BET surface area of recycled U3O8 could be modified by controlling the oxidation temperature of the UO2 pellets. Recycled U3O8 powder with a high…
This study consists of elaborating and characterizing some nanometric materials in basic of rare-earth oxides by the soft chemistry technique. the first step of this work consists of synthesizing nanometric pure ceria by sol-gel process. In the second one, the Bismuth doped ceria by co-precipitation method was realize…
To study the chemical constituents of Saxifraga stolonifera (L.) Meeb., chromatographic techniques were applied to separate and purify the compounds, and their structures were confirmed on the basis of physicochemical properties and spectral data. Ten compounds were isolated and identified as 5-O-methylnorbergenin (1)…
Semiconductor quantum dots (QDs) are tiny light-emitting particles that have emerged as a new class of fluorescent labels for biology and medicine. Compared with traditional fluorescent probes, QDs have unique optical and electronic properties such as size-tuneable light emission, narrow and symmetric emission spectra…