Materials Literature
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Visible and near-infrared photoluminescence (PL) at room temperature is reported from Si nanowires (NWs) grown by chemical vapor deposition from TiSi2 catalyst sites. NWs grown with average diameter of 20 nm were etched and oxidized to thin and passivate the wires. The PL emission blue shifted continuously with decrea…
Hydroxyl groups in dextrans have been selectively oxidized to aldehyde groups by sodium periodate in a controlled fashion with a percentage of conversion ranging from 6 to 100%. Dextrans (10, 70, 148, 500, and 2000 kDa) and oxidized 10k dextrans have been successfully grafted to functionalized silicon surfaces. The ef…
Forced to comply: The MnIII6CrIII complex 1 is constructed from two trinuclear manganese triplesalen complexes and one [Cr(CN6)]3− ion, and possesses a spin ground state of St=21/2. The threefold symmetry enforced by the triplesalen ligand precludes a complete cancellation of the single-site magnetic anisotropies and…
The effects of shadowing in oblique incidence metal (100) epitaxial growth are studied using a simplified model. We find that many of the features observed in Cu(100) growth, including the existence of a transition from anisotropic mounds to ripples perpendicular to the beam, can be explained purely by geometrical eff…
An analysis of aligned nematic liquid crystal cells containing core-shell nanospheres shows that it is possible to devise a new type of metamaterial whose index of refraction is tunable from negative, through zero, to positive values. The design parameters for the constituents can be scaled for application in the opti…
Excited-state calculations, notably for quasiparticle band structures, are nowadays routinely performed within the GW approximation for the electronic self-energy. Nevertheless, certain numerical approximations and simplifications are still employed in practice to make the computations feasible. An important aspect fo…
To study digital Mott insulator LaTiO3 and band insulator SrTiO3 interfaces, we apply correlated band theory (LDA+U) to (n,m) multilayers, 1
A particle dynamics-based hybrid model, consisting of monodisperse spherical solid particles and volume-averaged gas hydrodynamics, is used to study traveling planar waves (one-dimensional traveling waves) of voids formed in gas-fluidized beds of narrow cross sectional areas. Through ensemble-averaging in a co-traveli…
Several puzzling aspects of interplay of the experimental lattice distortion and the magnetic behavior of four narrow ${t}_{2g}$-band perovskite oxides (${\mathrm{YTiO}}_{3}$, ${\mathrm{LaTiO}}_{3}$, ${\mathrm{YVO}}_{3}$, and ${\mathrm{LaVO}}_{3}$) are clarified using results of first-principles electronic structure c…
We use three-dimensional particle dynamics simulations, coupled with volume-averaged gas phase hydrodynamics, to study vertically vibrated gas-fluidized beds of fine, cohesive powders. The volume-averaged interstitial gas flow is restricted to be one-dimensional (1D). This simplified model captures the spontaneous dev…
We measure and compare the electronic transport properties of individual multiwall carbon nanotubes (MWNTs) and individual single-wall carbon nanotubes (SWNTs), and SWNT networks of varying thickness. The thinnest SWNT networks, like the individual semiconducting SWNTs, show nonlinear current-voltage $(I\text{\ensurem…
This paper investigates the electric field distribution along the surface of high voltage polymer insulators and its enhancement due to water droplets by means of computational simulations and laboratory experiments. Different factors affecting the electric field distribution are analyzed through finite element method…
SUMMARY Standard procedures of cotton scouring involve alkali treatment, usually with NaOH. Waxes, protein substances, pectin and other impurities are removed from fiber during alkali conditions and some damages occurred. Enzymatic cotton scouring with pectinases is ecologically and economically favorable, compared wi…
In light of modern application trends, with variable speed drives and permanent magnet technologies, the use of Class H (180 degC) insulation systems is a necessary step to utilize these new technologies to their fullest capabilities. Present high voltage (HV) insulation systems utilize well-known global vacuum pressu…
Partial discharge (PD) is one of key factors which lead to premature failure of inverter-fed motors. It is proved that characteristic parameters of PD can be used to evaluate life of insulation material effectively under alternating current (AC). In this paper, some parameters of PD are statistically based on measurem…
In searching process for new, advanced technologies which could be applied for on-site diagnostics of machine insulation this paper discuses the application of damped AC voltages to detect and to analyze the PD processes. Based on laboratory investigation on a full scale stator insulation system, as well as during fie…
The stator insulation breakdown is a major cause of AC machine failures. Ground insulation defaults are easily detected by classical systems based on the leakage current measurements, however the turn to turn insulation degradations are more difficult to detect. For large machines, on-line methods, based on partial di…
Recently, considerable efforts were deployed at Hydro-Quebec to retrieve all partial discharge (PD) files recorded with the PDA-H instrument over the last 25 years and which were scattered all over in plant computers. These initial raw data files have been centralized on a corporate computer, where all new measurement…
An electronic system with active feedback has been developed to facilitate measurement of resistive currents in polymer films up to breakdown. The system cancels the capacitive current actively to facilitate the measurement of the resistive current. The measured current is the result of the very rapid relaxation from…
A novel polyoxometalate [Ni(bpy)3]2[W4V2O19] (Ni2V2W4) has been synthesized by the hydrothermal method and the structure determined by X-ray crystallography. Ni2V2W4 crystallizes in a trigonal system with space group R -3c (a = 15.8984 (5) Å, b = 15.8984 (5) Å, c = 43.855 (3) Å). In the structure of the compound, term…