Materials Literature
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We present the first treatment of the refraction of physical electromagnetic waves in newly developed negative index media (NIM), also known as left-handed media (LHM). The NIM dispersion relation implies that group fronts refract positively even when phase fronts refract negatively. This difference results in rapidly…
The local structure of a solid-on-solid (SOS) interface in a two-dimensional kinetic Ising ferromagnet with single-spin-flip Glauber dynamics, which is driven far from equilibrium by an applied field, is studied by an analytic mean-field, nonlinear-response theory [P.A. Rikvold and M. Kolesik, J. Stat. Phys. 100, 377…
The spin-dependence of the interface resistance between ferromagnetic Fe and InAs is calculated from first-principles for specular and disordered (001) interfaces. Because of the symmetry mismatch in the minority-spin channel, the specular interface acts as an efficient spin filter with a transmitted current polarisat…
Various physical quantities were measured and analyzed for the Cu-substituted thermoelectric oxide ${\mathrm{NaCo}}_{2\ensuremath{-}x}{\mathrm{Cu}}_{x}{\mathrm{O}}_{4}.$ As was previously known, the substituted Cu enhances the thermoelectric power, while it does not increase the resistivity significantly. The suscepti…
The transition metal ions doped with TiO2 films are of magnetic properties at room temperatures and have stimulated many scientists to study other properties. The Co-TiO2 sandwich composite films have been recently grown on glass and silicon substrates by using alternately radio frequency reactive and direct current m…
We analyze the reflection and transmission coefficients calculated from transfer matrix simulations on finite lengths of electromagnetic metamaterials, to determine the effective permittivity (\ensuremath{\varepsilon}) and permeability (\ensuremath{\mu}). We perform this analysis on structures composed of periodic arr…
Polycrystalline BaTiO 3 /SrTiO 3 (BT/ST) multilayer thin films were fabricated via pulsed-laser deposition onto Pt/Ti/SiO 2 /Si substrates. The dielectric constant of the multilayer films was obviously enhanced and the dielectric loss was almost the same as that of the pure BaTiO 3 and SrTiO 3 thin films. A dielectric…
Boltron H30 is a polyester polyol with a dendritic structure, developed by Perstop Corp. Complete methacrylated H30 oligomers were obtained by using three different reaction routes, i.e., treatment of H30 with methacrylic anhydride, methacryloyl chloride and 2-isocyanatoethyl methacrylate (IEM). The viscosities of the…
Results of local spin-density approximation (LSDA) and LSDA + U calculations of the electronic structure and magnetic configurations of the 50% hole-doped pseudocubic perovskite La 0.5 Sr 0.5 MnO 3 and double-layered LaSr 2 Mn 2 O 7 are presented. We demonstrate that the on-site Coulomb correlation ( U ) of Mn d elect…
The synthesis, photophysical, and photochemical properties of a series of stable bacteriochlorins containing a fused six-member anhydride or an imide ring are discussed. The Q y band (a 1u → e gx transition) in the near-infrared region (NIR) lies between 788 and 831 nm depending upon the macrocycle substituents. Compo…
Abstract These days, auditors are more concerned than ever about what is “material.” SEC Staff Bulletin No. 99 listed qualitative factors to consider when determining materiality. It's worth re‐examining. © 2002 Wiley Periodicals, Inc.
A new mixed-valent silver complex [AgII(tmc)][AgII(tmc)(H2O)]2·[AgI11(C2)(CF3CO2)12(H2O)4]2 (tmc = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane) was synthesized by adding tmc to a concentrated aqueous solution of silver trifluoroacetate containing dissolved silver acetylide. Single-crystal X-ray analysis rev…
The calculation of dipole moments of nonlinear optical (NLO) chromophores can be carried out with a variety of theoretical approaches. A systematic study of the available calculation methods is presented. The study focuses on a series of NLO chromophores with varying electron-donor and electron-acceptor fragments and…
Thermally induced transition between anhydrous and hydrated forms of highly crystalline beta-chitin was studied by differential thermal calorimetry (DSC) and X-ray diffraction. DSC of wet beta-chitin in a sealed pan gave two well-defined endothermic peaks at 85.2 and 104.7 degrees C on heating and one broad exothermic…
Electron paramagnetic resonance, electronic absorption, and resonance Raman spectroscopy reveal that in the oxalate-bridged compounds, [[(tBuCO2)3M2]2(mu-O2CCO2)]+[PF6]-, the unpaired electron is delocalized over four metal centers (M = Mo or W) as a result of M2 delta to bridge pi conjugation, but in the related cati…
Glycofunctionalized gold nanoparticles can easily be manipulated as water-soluble macromolecules, highly stable in colloidal solutions. Different nanostructures (see Figure for an example) have been obtained by varying the particle concentration, the Ca2+ level in the solution, and type of oligosaccharide. A potential…
Cationic terbium complexes bearing an N-methylphenanthridinium chromophore have been incorporated in sol–gel thin films and their response characteristics analysed with respect to variations in dissolved oxygen concentration. Analysis of the emission lifetime decay curves (547 nm) has allowed a linear calibration mode…
Self-assembled multilayers composed of alternated layers of glucose oxidase (GOx) and poly(allylamine) covalently attached to [Os(bpy) 2 ClPyCOH] + (PAH−Os), deposited on a 3-mercaptopropanesulfonic acid (MPS)-modified gold surface were studied “ex situ” and “in situ” (with the films in contact with water) by ellipsom…
We show that magnetic structures involving partial disorder of local magnetic moments on the Mn atoms in (Ga(1)-(x)Mn(x))As lower the total energy, compared to the case of perfect ferromagnetic ordering, when As defects on the Ga sublattice are present. Such magnetic structures are found to be stable for a range of co…
We present results of a dc magnetization study which show interesting thermomagnetic history effects across the antiferromagnetic-to-ferromagnetic transition in Ce(Fe 0.96 Al 0.04 ) 2 pseudobinary alloy. Specifically, we observe (i) the degree of ZFC/FC irreversibility rising with increasing field; (ii) the virgin cur…