Materials Literature
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Solution-phase synthesis of single-crystal ZnO disks and rings was achieved in high yield at low temperature (70–90 °C) by using an anionic surfactant as a template. The reaction can be controlled by means of the growth temperature and the molar ratio of reagents to favor formation of disks or rings. A growth mechanis…
This Letter reports the laser energy dependence of the Stokes and anti-Stokes Raman spectra of carbon nanotubes dispersed in aqueous solution and within solid bundles, in the energy range 1.52--2.71 eV. The electronic transition energies (${E}_{ii}$) and the radial breathing mode frequencies (${\ensuremath{\omega}}_{\…
Highly c-axis oriented CaRuO3 thin films were prepared on LaAlO3 buffered Si(100) substrates at 650 °C by pulsed laser deposition. The buffer layer had a significant effect on the microstructure and electrical properties of the subsequent CaRuO3 thin films. Typical columnar grown CaRuO3 films were available using LaAl…
We study Nim with the additional rule that each player can put a constraint on the next player’s move. This is called a Muller twist. The constraints are of the form “the number taken must not be equivalent to some numbers modulo n”. A solution for a large group of such games is given.
Most prediction methods for wave overtopping are based on physical model tests under simple 2-D conditions. This paper describes experiments to measure mean and wave-by-wave overtopping discharge under oblique wave attack. Results suggest that overtopping discharges reduce significantly only for angles of wave attack…
Rigid pour polyurethane foam is presented to serve as a high voltage insulation material. The proposed foam is closed-cell two components flotation system that has low viscosity and low pressure. Different production techniques are applied and explained. The investigation of cross-section and skin of rigid pour polyur…
The presence of pollution on the insulators surfaces considerably modifies the voltage distribution across an insulator string. This phenomenon has been studied and a computer program has been developed. Poor design, manufacturing defects and pollution can caused flashover (voltage which will cause an arc through the…
Magnetismus mit neuem Dreh: Der chirale 3D-Ferrimagnet [{CrIII(CN)6}{MnII(d- oder L-NH2ala)}3]⋅3 H2O (NH2ala=Aminoalanin-Ion) mit Tc=35 K ist durch eine ausgedehnte, chirale, tripelhelicale Anordnung von MnII-Ionen gekennzeichnet, die durch die Koordination der organischen Liganden verursacht wird (siehe Bild; violett…
The existence of low angular momentum image-potential states is predicted both for single- and multiwalled nanotubes. The states are confined between the self-induced potential on the vacuum side and the surface barrier, created by the central ascent in the transverse nanotube potential. Effective interactions near th…
The optical and electronic properties of a wide-gap (∼3.3 eV) layered oxychalcogenide, La 2 CdO 2 Se 2, were examined using epitaxial thin films prepared by a reactive solid-phase epitaxy. Two optical absorption peaks due to exciton split by the spin−orbit interaction were observed at 3.43 and 3.61 eV at 10 K near the…
Electrical and optical properties of poly(3-methylthiophene) (P3MeT) films have been studied by the current-sensing atomic force microscopic (CS-AFM) and near-normal incidence reflectance spectroscopic (NNIRS) techniques. The P3MeT films were electrochemically deposited onto gold-on-silicon electrodes and their doping…
The self-assembly of supramolecular copper "tennis balls" that possess unusual magnetic properties using a small pyridyl amide ligand is described. Copper(II) complexes of N-(2-pyridylmethyl)acetamide (HL) were synthesized in methanol. In the absence of base, the mononuclear complex [Cu(HL)(2)](ClO(4))(2) (1) was prep…
This paper demonstrates the use of stimulated Raman scattering (SRS) in silicon to create optical amplification in SOI waveguides. Advantages of this approach include its tunability and the fact that it does not necessitate special impurities or nanostructures. Moreover, SRS is also a candidate for realization of lase…
BIOSS4 steel is essentially a nickel-free austenitic stainless steel developed by the Institute of Metal Research, Chinese Academy of Sciences, in response to nickel allergy problems associated with nickel-containing stainless steels that are widely used in medical applications. The high nitrogen content of this steel…
The kinetics of the aggregation process of DiesterB, a homologous coproduct generated in Verteporfin synthesis (the drug used in the medication Visudyne applied in photodynamic therapy), was investigated by visible spectrophotometry in several aqueous organic solvents (dimethyl sulfoxide (DMSO), acetonitrile, dioxane,…
Abstract This paper describes electrochemical characteristics of poly(methylene blue) electrolytically deposited on glassy carbon and examines the electrocatalytic activity of the polymer toward oxidation of the coenzyme NADH. Redox‐active properties of the cationic polyelectrolyte arose from both electron self‐exchan…
A non-volatile 64 Mb phase-transition RAM is developed by fully integrating a chalcogenide alloy GST (Ge/sub 2/Sb/sub 2/Te/sub 5/) into 0.18 /spl mu/m CMOS technology. This alloy is programmed by resistive heating. To optimize SET/RESET distribution, a 512 kb sub-core architecture, featuring meshed ground line, is pro…
In the field of functionalized polyoxometalates, organosilyl derivatives of polyoxotungstate constitute a special class of hybrid organic-inorganic system. The first organosilyl derivative of the monovacant Dawson heteropolyoxotungstate [alpha2-P2W17O61]10- was obtained by three different methods. The use of two organ…
We report salt-induced phase separation of polyelectrolyte complexes in solution correlates with deposition of polymer multilayers at a surface. Multilayer growth was followed in situ using FTIR-ATR (Fourier transform infrared spectroscopy by attenuated total reflection). The polymer system was quaternized poly(4-viny…
Quasicrystals have both positional and orientational long-range order. Thus, they are essentially anisotropic. However, both theory and experiment show that ordinary linear elastic property (linear phonon elasticity) is isotropic for quasicrystals. To detect the quasicrystal anisotropy the nonlinear elasticity should…