Materials Literature
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The different parts of Calotropis gigantea and Vinca rosea belonging to the families of Asclepiadaceae and Apocynaceae were studied for their antioxidant and antimicrobial activities against selected bacterial strains. From the results it was evident that the flower of Vinca rosea showed the highest antioxidant activi…
In this study effects of small amount of yttrium addition on grain growth of C.P titanium (single α), Ti-14Mo-3Nb-1.5Zr (single β) and a newly developed Ti-4.5Al-6Nb-2Mo-2Fe (α+β) titanium alloy are investigated. By adding yttrium nano-sized Y 2 O 3 particles are formed in 'in-situ' mode. These particles lead to signi…
The authors have studied the field emission (FE) behavior of multiwalled carbon nanotube (MWCNT) yarn at different temperatures. By analyzing how the FE characteristics change with temperature and the residual gas spectra of the vacuum chamber, it was concluded that the intrinsic FE of MWCNTs follows the Fowler–Nordhe…
Results from tests of technology for decontaminating spent radioactive ion-exchange resins at the Balakovo and Kalinin nuclear power stations are presented. Versions of technological schemes with cleaning and repeated use of decontaminating solution are considered. The possibility of considerably reducing the volume o…
Core-shell structured heterogeneous catalyst nano-particles offer the promise of more efficient precious metal usage and also novel functionalities but are as yet poorly characterised due to large compositional variations over short ranges. High angle annular dark field detector in a scanning transmission electron mic…
The particulars of the EPR spectrum of magnetically concentrated crystals of double molybdates and tungstenates with a crystal structure of low symmetry were studied at liquid-helium temperatures in the frequency range 15–120GHz. The directions of the principal magnetic axes were determined and the principal values of…
Abstract A synthetic strontium isomorph (Sr 2 ZnSi 2 O 7 ) of the hardystonite structure (Ca 2 ZnSi 2 O 7 ) was investigated with X-ray powder diffraction. The average structure (S.G. P -42 1 m ), a = 8.0007(1) Å, c = 5.1722(1) Å, was refined by Rietveld method and a R F 2 = 0.0216 was achieved using 394 independent r…
Ca 0.9 Yb 0.1 MnO 3 nanopowder prepared by a gas-phase reaction (GPR) consisted of well-dispersed particles with an average diameter of 47 nm. Sintering of this GPR powder proceeded rapidly and at a lower temperature than that required for a comparable powder prepared by conventional solid-state reaction (SSR). The si…
Monodisperse magnetic iron oxide nanoparticles (MNPs), coated with PEG at different molecular weight, were prepared via self-assembly method. The particle diameters were measured by dynamic light scattering and transmission electron microscope. Increasing the molecular weight of PEG in the coating polymer increased th…
A simple non-gel sieving capillary electrophoresis (NGSCE) method was established to determine the MW of silk fibroin using CE. The background electrolyte with a pH of 8.8 was based on three components: polyethylene glycol, tris(hydroxymethyl)aminomethane, and sodium dodecyl sulfate (SDS). NGSCE showed a good linear r…
The effects of the uncertainties associated with the transverse pattern of carbon nanotubes (CNTs) of the conducting type in a semiglobal interconnect based on a densely packed CNT bundle are investigated. The effectiveness of the insertion of a variable number of repeaters along the interconnect and the influence of…
Abstract Due to their unique properties, self‐supporting nanoporous aluminum oxide (alumina) membranes are useful substrates for the indirect co‐cultivation of cells. The membrane can act as a physical barrier between different cell types, whereas the cell‐to‐cell communication is guaranteed by the diffusion of solubl…
We demonstrate that energy-filtered secondary electron (SE) imaging can be used effectively to observe dopant contrast from an InP surface covered with a contamination layer formed by continuous electron irradiation. Although dopant contrast from a surface covered with a contamination layer was almost invisible in a n…
Interfaces between solids are generally considered weak regions in electrical insulation systems. This is particularly so if the electrical stress is applied parallel to the interface. Important parameters, affecting the breakdown strength, are interface pressure, humidity, presence of liquid dielectric and the surfac…
Abstract Many research activities on the solid‐state oxide fuel cell (SOFC) have been performed for production of electronic energy without fossil fuel. To design the efficient SOFC electrolyte, we should clarify the detailed mechanism on oxide ion conduction. LaAlO 3 perovskite has been much expected as the electroly…
Abstract Defining terminology and nomenclature in such a manner that important features and properties of a system or phenomena for which a description is sought are succinctly captured is a task fraught with difficulty, in particular when dealing either with complex or subtle issues. The recent exchanges in the liter…
A quaternary 0.90Pb(Zr 0.48 Ti 0.52 )O 3 –0.05Pb(Mn 1/3 Sb 2/3 )O 3 –0.05Pb(Zn 1/3 Nb 2/3 )O 3 (0.90PZT–0.05PMS–0.05PZN) piezoelectric ceramic was synthesized by a conventional method, and CuO was adopted to lower its sintering temperature. The crystal structure, micromorphology, and electrical properties were studied…
Electrical degradation processes in epoxy resins, such as electrical treeing, were found to be dependent on the temperature at which the experiments were carried out. Therefore, it is of considerable research interest to study the influence of temperature on the dielectric properties of the polymers and to relate the…
This work aims at improving the spatial resolution for the pulsed electro-acoustic method - PEA. Whatever the measurement principle considered, the best spatial resolution achieved so far is of the order of several micrometers, being at most 10μm in case of the PEA method. This limit constitutes a drawback when consid…
Low density polyethylene (LDPE) and high density polyethylene (HDPE) are common materials used within high voltage insulation systems. These materials will be aged after working under high voltage for a long time. The ageing process of these materials may be affected by external factors. The application of repetitive…