Materials Literature
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Crystal structure, chemical composition and phase transition of second phases in (La,Nb)-Codoped TiO 2 varistor ceramics was investigated. SEM, XRD, XPS and EDS were carried out the analytic studies on the microstructure, chemical composition and crystal structure of TiO 2 ceramics. The results showed that the second…
A total 36 taxa belonging to 7 genera of desmids have been described and illustrated from Bees-hazaar lake of which 11 taxa are recorded for the first time for Nepal. This is a preliminary work on the desmids from this lake.Keywords: Algae, Bees-hazaar Lake, Desmids, Nepal.doi: 10.3126/on.v6i1.1656Our Nature (2008)6:5…
Abstract Recently, artificial neural networks (ANN) are being used as an interdisciplinary tool in many applications. There are various training algorithms used in neural network applications. The aim of this study is to investigate the effect of various training algorithms on the learning performance of the neural ne…
Abstract magnified image The effects of time, CO 2 ‐gas‐injection pressure, and bulk temperature on the precipitation of Ca 2+ ions as a precipitated calcium carbonate (PCC) from a dolomite leach solution were investigated. Precipitation periods from 1 to 7 min were examined, and experiments were run at CO 2 ‐injectio…
A novel mixed phase Ru–WCN film grown by plasma-enhanced atomic layer deposition has been investigated as a novel direct-plate liner for advanced copper metallization. Ru–WCN films were grown using a nanolaminate approach, and the properties of the films were investigated as they relate to specific changes to processi…
Boron carbide reinforced with multiwalled carbon nanotubes were prepared by hot pressing at 1850°C under vacuum and 60 MPa pressure. Silicon powder was used as a sintering aid to decrease the sintering temperature of boron carbide. The results showed that the additions of silicon and multiwalled carbon nanotubes impro…
In this work, we address the analysis of ZnO thin films and electrical characteristics of ZnO thin film transistors (TFTs) with HfO 2 high- k gate dielectrics after low-temperature postannealing. The SIMS analysis shows that the diffusion of Zn atoms into the HfO 2 gate dielectrics will occur after 300 °C annealing an…
A new technology for assessing the condition of MV cable connections is described. The technique measures partial discharges (PDs) from joints and cables on-line, i.e. while the cable connection remains in-service. The system (called PD-OL) is able to locate the origin(s) of PDs from a complete cable connection by usi…
The oriented ZnO nanotube arrays have been synthesized by a chemical solution method on a silicon wafer coated with ZnO thin films via thermally decomposing zinc acetate at 280°C. The morphologies, phase structure and the photoluminescence (PL) properties were investigated by field-emission scanning electron microscop…
Abstract Alteration minerals dickite and kaolinite were detected in two hydrothermal Pb-Zn-Ag sulphide deposits in the northern Kosovo region. Dickite is associated with skarn mineralization in the Trepča (Stari Trg) deposit and kaolinite occurs in vein sulphide parageneses in the Crnac deposit. The mineralogical char…
Summary Conventional material specifications and test methods were developed to support load-based designs in which inelastic deformations are relatively small and yield strength is the primary material factor governing design. However, in strain-based designs where substantial portions of the structure soften under p…
The local structure distortion, the spin Hamiltonian (SH) parameters, and the electric fine structure of the ground state for Mn 2+ (3d 5 ) ion in ZnO crystals are systematically investigated, where spin–spin (SS), spin–other-orbit (SOO) and orbit–orbit (OO) magnetic interactions, besides the well-known spin-orbit (SO…
Based on generalized Steinmetz equation, this paper provides an expanded equation to achieve the wide-field iron-loss simulations of laminated magnetic steels. According to the analysis of magnetic steel 65CS1300 of China Steel Corporation, the new equation shows a lower predication error than 10%.
The temperature dependence of the optical properties of GdBaCo2O5.5 in the region of the metal-insulator transition was studied in the spectral range λ = 4.0–0.258 μm (E = 0.3–4.8 eV) by the spectroscopic ellipsometry method. The electronic structure of the crystal at T = 300 K was calculated by the linearized muffin-…
Eu+++ and Tb+++ ions have been incorporated into nanodimensional yttrium oxide host matrices via a sol-gel process using Y5O(OPr(i))13 as precursor (OPr(i) = isopropoxy). The as-synthesized white powders have been annealed at different temperatures. Photoluminescence (PL) spectroscopy and X-ray diffraction (XRD) have…
The through-thickness thermal conductivity in conventional adhesive joints (of approximately 0.3 W/m-K) fails to meet the thermal load transfer requirement in numerous applications to enable lean manufacturing and improve system reliability to thermal load. Carbon nanotubes are known to possess extremely high thermal…
The results of coordinated spectroscopic studies of the nature and properties of electronic excitations localized at regular and defect sites of the Be2SiO4 lattice are presented. The methods employed are electron-beam-excited pulsed absorption spectroscopy, pulsed cathodoluminescence, and low-temperature VUV spectros…
The specific features and possibilities of preparation of protective coatings and composite materials based on fluoromonomers using high-energy rays ( 60 Co γ-rays, fast electrons) were analyzed. The emphasis was placed on synthesis and application of tetrafluoroethylene telomers in acetone. The structure and properti…
ZnTe and ZnTe:Cr films were prepared onto glass substrates using the thermal evaporation method. Structural properties of the prepared samples were analyzed using X-ray diffractometry, and the presence of a ZnCrTe phase was identified along with poor crystallinity. Composition analysis was done using XPS and the Cr co…
A mathematical model of sulfonation of an HDPE film by sulfuric anhydride from gaseous is proposed. This model takes into account changes in the physicochemical characteristics of the sulfonated layer in the course of modification. It is assumed that this process is controlled by an increase in the solubility and diff…