Materials Literature
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We propose an efficient concentrator of the magnetic component of evanescent field of light for measuring magnetic responses of nanostructures. It is in the form of a tapered fiber probe, which in its final part has corrugations along the angular dimension and is coated with metal except for the aperture at the tip. I…
The reaction of congeners of Sovol technical mixture of polychlorobiphenyls with polyethylene glycols was studied. Mixtures of hydroxy and mono(polyethylene glycol)oxy derivatives were obtained. The mixtures synthesized, which are of low hazard, were used as additives to industrial oil to improve its tribological char…
This paper deals with theoretical and experimental investigations on an innovative insulation material called syntactic foam. Syntactic foam is a composite dielectric consisting of a polymeric matrix with embedded hollow microspheres. The main focus of the present study is on the electrical breakdown process of syntac…
Zirconia toughened alumina (ZTA) ceramics are interesting materials for biomedical applications due to their high strength, hardness, fracture toughness, abrasion resistance and excellent biocompatibility. The manufacturing of biomedical ceramic components involves the development of an integrated production process,…
We synthesized five donor–π-spacer–acceptor type organic photosensitizers bearing different types of electron-withdrawing groups (EWGs); trifluoromethyl, o -nitrophenyl, p -nitrophenyl, cyano, and carboxyl groups, on their acceptor part in the aim of observing an influence of the EWGs on spectral and photovoltaic prop…
This paper presents a nanorobotic approach facilitating the transfer and characterization of individual graphene flakes that are grown by different fabrication techniques. The approach makes use of a nanorobotic atomic force microscope system that is integrated into a high resolution scanning electron microscope and f…
The structure, intra- and intermolecular interactions, and conformations of macromolecules in cellulose diacetate films under the conditions of formation of the liquid crystal state in the course of nitromethane vapor sorption were studied by Fourier IR spectroscopy and polarization microscopy. The number of intramole…
We investigated the electronic scattering properties of a local bump strain in graphene sheet in frame of Born approximation. The differential scattering cross section is a function of outgoing and incident angles and has the six-fold rotational symmetry with respect to both angles. The incident plane wave is scattere…
This paper presents a permanent magnet linear vernier (PMLV) machine which is dedicated for low-speed direct-drive applications. Firstly, the machine operation principle is discussed, and the preliminary design approach is formulated. Then, by applying the analytical calculation method for solving the magnetostatic fi…
In this study, a repetitive impulse voltage generator has been developed for detecting RPDIV (Repetitive Partial Discharge Inception Voltage) and RPDEV (RPD Extinction Voltage) of motorette test specimen designated in IEC60034-18-41-TS in the inverter surge. The fabrication of a generator is also described using a hig…
In a pot experiment with corn (Zea mays L. cv. Moncada) and an incubation study, ash from co-combustion of sugarcane bagasse and eucalyptus wood was evaluated for use as a potential alternative to conventional agricultural limestone. Ash was effective as liming agent. Soil pH increased from 5.1 to 5.9 in a Haplic Aren…
A Weibull analysis was performed of the strength distribution and size effects for 2000 specimens of H-451 nuclear-grade graphite. The data, generated elsewhere, measured the tensile and four-point-flexure room-temperature rupture strength of specimens excised from a single extruded graphite log. Strength variation wa…
TiO 2 -based nanosheets (TiNSs), TiO 2 -based nanotubes (TiNTs) were prepared by hydrothermal processing, and polyurethane foams with TiO 2 nanopowders (P25), TiNSs and TiNTs were synthesized by free-rising foaming method. The Fourier-transform infrared (FT-IR) spectra show that the addition of titanium dioxide does n…
Hydrophobicity of polymeric insulators is one of the main properties that determine their performance in polluted environments. The hydrophobic property is reduced as the insulator's surface ages due to the electric activity caused by wetting and pollution; however, it is recovered during the resting time in air. The…
Boron nitride (BN) was prepared by nitriding pure boron (B) deposited on carbon substrates by chemical vapor deposition (CVD). Thermodynamic analysis of preparing BN by nitriding CVD B at 1200–1550 °C was firstly performed. And then, the effects of nitridation conditions, including temperature, nitridation atmosphere…
A lumped parameter equivalent circuit basis for calculating and allocating heat power sources in a transducer is presented along with experimental results. The simple model allows heat power calculations at resonance based on readily attainable parameters for transducers with uniform fields. Measured and finite elemen…
This paper addresses the challenges arising when considering the conversion of an existing low voltage cable infrastructure in distribution networks from AC to DC. It will explore the ageing mechanisms of low AC voltage cable insulation and how could they differ when operated at DC voltages. In a DC environment, the c…
The present paper proposes an investigation of the thermal phenomena caused by Joule losses and iron losses in a novel electric machine, the dual-rotor Permanent Magnet Induction Machine (PMIM). Empirical dimensionless formulations for the computation of convection heat transfer coefficients in each region of the mach…
In this study, new phthalonitrile and phthalocyanines were synthesized and characterized. Starting material compound 3 was obtained by reaction of ninhydrin with 4-nitrophthalonitrile. Phthalocyanines 4–8 were prepared by reaction 4-(2-phenoxy-1, 3-dioxo-2, 3-dihydro-1H-inden-2-yloxy) phthalonitrile with corresponding…
In this study, poly(N-isopropylacrylamide) (PNIPAAM) hydrogels were synthesized via a liquid template polymerization method using 200–400 nm polydimethylsiloxane (PDMS) droplets as the porogens, which were stabilized by sodium dodecyl sulfate (SDS). Similar hydrogels were also synthesized with iron (III) oxide superpa…