Materials Literature
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It has been clarified by researchers that insulators having contact angles, e.g. plusmn45 deg with regard to the plane electrodes, is hard to acquire charge when they are exposed to high voltages in vacuum. For example, an insulator in the shape of a truncated frustum is free from charging. However, since such insulat…
The new half-metals Fe2ScO4 and FeSc2O4 were designed and their spinel structures were optimized based on the first-principle pseudo-potential method. Their electric and magnetic properties including molecular magnetic moments and electronic structures were calculated and analyzed, and then were compared with those of…
Microspheres covered with ZnO nanowires were fabricated by oxidative evaporation of pure zinc powder without catalyst at 450°C. X-ray diffraction (XRD) demonstrates that the as-obtained sample can be indexed to high crystallinity with wurtzite structure. The structural features associated with different growth stages…
The defect structure and the anisotropic g factors of a tetragonal Ni 3+ center in PbTiO 3 are theoretically investigated from improved perturbation formulas of the g factors for a 3d 7 ion with low spin S = 1/2 in tetragonally elongated octahedra, established in this work. Based on the studies, the distance between t…
Abstract We perform a first principles study of the smallest carbon nanotube ever discovered namely the (2,2) tube with diameter 0.27 nm. Contrary to what recently stated in the literature, the curvature effects are not enough to convert the (2,2) nanotube into a semiconductor and the (2,2) nanotube is metallic in agr…
Abstract The present account describes our efforts to understand the microscopic aspects of condense phase phenomena, such as ion solvation in molecular liquids and charge carrier localization in molecular solids, by viewing finite-size molecular clusters as their embryonic forms. In this effort, we efficiently prepar…
Iron-containing mesostructured materials (Fe-SBA-15) are suitable for continuous treatment of phenolic aqueous solutions by means of catalytic wet peroxide oxidation (CWPO) in a packed-bed reactor. These materials were successfully extruded, crushed and sieved with a particle size ranging from 1 to 1.6 mm using minera…
Fiber-reinforced composite materials have outstanding mechanical and electrical properties; their applications have been expanded to commercial products as well as military components. Using composite materials, researchers have studied the radar absorbing, or `stealth' technology. In this research, to develop the rad…
E class glass fibre has attributes of high strength, non-electric conduction, light weight and high temperature resistant, which especially make it suitable for electronic applications. Good sizing conditions will strengthen the glass fibre yarn, reduce the number of broken filaments, and speed up the weaving process.…
X-ray diffraction and Mössbauer spectroscopy were used to study the mechanical alloying of the Fe-Pb system, which is immiscible under equilibrium conditions, in a planetary ball mill by the example of an Fe(95)Pb(5) composition. The formation of a supersaturated bcc solid solution of Pb in α-Fe with a limiting concen…
A dielectric material (SiO 2 ) was added to the PtO x recording layer of a recently developed super-resolution near-field structure (super-RENS) disc to enhance the readout durability. The PtO x –SiO 2 (Pt 8.4 Si 21.1 O 70.5 ) composite layer was prepared by a chip-on-target sputtering method. The recorded mark became…
Triggered steam explosion experiments have been carried out in the TROI facilities to investigate the energetics of the steam explosions. Two types of corium melt were used as a melt. One was eutectic corium at 70:30 wt% (UO2:ZrO2), and the other was corium at 80:20 wt%. The diameter of the water pool was 0.6 m, and t…
Summary form only given. The topological structure and basic approaches for parameter estimation for a new hybrid transformer model are presented in Part I of this two-paper set. Part II deals with the model benchmarking and also discusses additional methods for parameter estimation based on laboratory measurements. T…
Crack propagation behavior in HDPE was studied. The preliminary orientation of the polymer, which is deformed in its isotropic state via necking and breaks down at the neck propagation stage, improves the crack resistance and ductility of the material. The critical crack opening in preoriented HDPE samples dramaticall…
The kinetics of damage accumulation during tension of a low-carbon steel with an edge notch has been studied by acoustic emission, ultrasonic attenuation, and replicas. The criteria of damage, fracture mechanics, percolation, and fractal dimension are estimated and used to distinguish the stages of fracture.
Os basaltos são rochas vulcânicas abundantes provenientes de extensos derrames de lava. A tecnologia de fiação contínua produz filamentos de basalto na forma de fios micrométricos amorfos. Neste trabalho são apresentados resultados da caracterização térmica e morfológica de fibras longas de basalto, de diâmetro microm…
Atmospheric corrosion is a common problem in the Gulf region in Saudi Arabia. Steel products produced locally have a problem of discoloration when stored in stockyards due to atmospheric corrosion. Corrosion inhibition of mild steel in the industrial and marine atmosphere of the Arabian Gulf region was investigated in…
Abstract Single crystals of a third modification of Ag 2 Te 2 O 6 (denoted as Ag 2 Te 2 O 6 –III) and of Ag 4 TeO 5 have been obtained as minor by‐products during hydrothermal phase formation experiments in the system Ag‐Hg‐Te‐O. The crystal structure of Ag 2 Te 2 O 6 –III ( P 2 1 / c , Z = 4, a = 6.4255(10), b = 6.98…
The filtration behaviour of woven and nonwoven fabrics at different air flow rate, dust feed rate, dust loading, time intervals and dust particles has been studied. It is observed that the pressure drop increases with the increase in airflow rate for both the woven and nonwoven filters. In general, the pressure drop i…
This paper presents work conducted on a zirconia (catalyst) activated two-stroke spark ignited engine to investigate the effect of high gauss magnetic energy on cyclic variation of combustion parameters. A 9000 gauss magnet, made up of Neodymium-Iron-Boron, is fixed on fuel line before carburetor. The coating is carri…