Materials Literature
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In recent years, a number of new models for the power diode have been proposed. The objectives of this paper are to provide the power electronics community with a comprehensive review and summary of recent power diode models. The models have been categorized systematically according to their modeling concepts with obj…
Phase separation kinetics and morphology of binary polymer mixtures (A/B) in the presence of photochemical reactions were investigated by using phase-contrast optical microscopy combined with digital image analysis. The polymers were chemically designed in such a way that two types of chemical reactions, intermolecula…
Time- and wavelength-resolved observation of a laser ablation plume from a strontium titanate target was performed under a dipole magnetic field applied from the substrate side. In contrast to the conventional method, the present method gave rise to increasing ionization of the growth species in the plume in the vicin…
Growth of Sr 2 Nb 2 O 7 particle size in KCl melts occurs by reaction on insoluble Nb 2 O 5 particles in the melt. Thus, Sr 2 Nb 2 O 7 size is controlled by the initial size of the reactants. By altering the reactant composition to include larger Nb‐rich reactants such as SrNb 2 O 6 , 5‐30 µm, anisotropic Sr 2 Nb 2 O…
Conversion of various epoxides to the corresponding thiiranes is achieved by thiourea in the presence of tin(IV) meso-tetraphenylporphyrin with excellent yields under non-aqueous conditions.
The maximum current density for HCOOH oxidation on deliberately stepped platinum surfaces with Pt(111) terraces of varying width and (110) monatomic steps decreases as the step density increases, or as the terrace width decreases. The maximum current densities on these surfaces are 1.6, 0.58, 0.46, and 0.39 mA cm−2 fo…
A new star structured regioregular poly(3-hexylthiophene) with a conjugated hyperbranched poly(triphenylamine) as the core has been shown to be electroactive and able to attain high levels of conduction up to 100 S/cm when doped. A hyperbranched poly(triphenylamine) was synthesized by a Negishi coupling reaction from…
We are primarily concerned with the variational problem with long-range interaction. This functional represents the Gibbs free energy of the microphase separation of diblock copolymer melts. The critical points of this variational problem can be regarded as the thermodynamic equilibrium state of the phase separation p…
We have investigated the microstructure related to the charge and orbital ordering in the manganites ${\mathrm{Pr}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ by transmission electron microscopy. Electron diffraction clearly shows the presence of the incommensurate structure in the paramagnetic insulator phase of ${\…
By means of tight-binding molecular dynamics simulations we find that the ground-state atomic structure of a typical high-energy grain boundary in diamond is highiy disordered with a large fraction of sp 2 bonded atoms. This structure gives rise to localised bands within the band gap. We describe how multiphonon assis…
The rapid formation (and erasure) of a dynamic phase grating is one condition required of materials for dynamic holography. The photochemical nematic–isotropic transition of the side-chain polymer liquid crystal (PLC) shown in the Figure, caused by the trans–cis photoisomerization of the azobenzene moiety, is reported…
Laminates containing a thin layer (5 to 200 µm thick) sandwiched between two thick layers (2 mm thick) were fabricated by sequential slip casting in order to study crack bifurcation. The thin layer was formed with a mixture of a pure ZrO 2 powder (MZ) and a Zr(Y)O 2 powder containing 3 mol% Y 2 O 3 (TZ). The thick lay…
Two nonmacrocyclic ligands with pyridine and carboxamide nitrogens as donors readily form bis complexes of the type [FeIIIL2]+ in which the Fe(III) centers exhibit preference for coordination to carboxamido nitrogens over pyridine nitrogens. These Fe(III) complexes with deprotonated carboxamido nitrogens are very stab…
Mean-square atomic displacements in lanthanum triiron cobalt dodecaantimonide, determined as a function of temperature using single-crystal neutron diffraction, show that the La atom exhibits an anomalously large displacement at room temperature, U(eq) = 0.0196 (9) Å(2), because it is too small to fill the atomic cage…
This paper presents a new method for determining the widths of the power and ground routes in integrated circuits so that the area required by the routes is minimized subject to the reliability constraints. The basic idea is to transform the resulting constrained nonlinear programming problem into a sequence of linear…
In small rings, strain energy is believed to be dominated by bond angles (Baeyer strain). However, it was found (Dill et al.) that, in bicyclobutane, bridgehead substitution effects on strain energy range from +10 to -30 kcal. Ab initio computations at the 6-31G and 6-31+G* levels have shown that the deformation cause…
High pressure Raman spectroscopic investigations have been carried out on Cs2SO4 up to a pressure of 164kbar. The behaviour of the internal modes of sulphate ions as a function of pressure are examined. In contrast to other disulphates, cesium sulphate does not exhibit any phase transition up to the highest pressures…
X-ray absorption fine structure (XAFS) spectroscopy using fluorescence mode detection has been successfully extended to quantitative examination of the local atomic environment of dilute analytes in a strongly scattering host matrices. This is applied to the characterization of thermally aged and neutron-irradiated Fe…
Refractories containing magnesium aluminate spinel (MgAl2O4) are materials for emerging technology in several applications like cement and steelmaking processes. In order to deep the understanding of these castables, this work presents the microstructural characteristics of an alumina-magnesia/self-forming spinel cast…
Abstract The ease with which plasticizer is combined with poly(vinyl chloride) resin is a measure of processing characteristics critical in the dry blending of suspension PVC and the gelation of plastisols. By using commercial grade plasticizers, this study developed predictive equations for the following processing p…