Materials Literature
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2-(Acylmethylene)propanediol diacetates, which cyclize readily under acidic conditions to give furans (76-84%) react with primary amines under palladium catalysis to give 1,2,4-trisubstituted pyrroles in moderate to good yields (39-53%). When glycine methyl ester is used as the amine, substituted methyl pyrrol-1-ylace…
The structure of the 42CaO.48SiO 2 10ZrO 2 glass was simulated by molecular dynamics and the results compared with the available experimental data. Since this is the first time that glasses with high percentage of ZrO 2 have ever been simulated, different computational protocols were tested and the procedure which bet…
Many researchers revealed that the addition of small amount of boron (B) significantly improves the creep strength of ferritic heat resistant steels. However the mechanism for such an effect caused by B has not been clarified yet. In the present study, the effect of nitrogen (N) on the behavior of B in 9Cr-3W-3Co base…
We investigated in detail the structural ordering developed in films of tetrahedral amorphous carbon (ta-C) under 100 kV to 200 kV electron beams of transmission electron microscopes (TEM). From systematic measurements of electron diffraction and electron energy loss spectra (EELS), in selected areas the ordered struc…
60–70% of the concrete lump from demolished structures is presently reused for subbase course material of roads, and the rest is discarded. In ten years the amount of the demolished concrete is estimated to be 3 to 5 times of the present amount. The reuse for subbase course will become difficult and recycling of concr…
Hierarchic structured hybrid tubular vascular media composed of endothelial cells (ECs), which covered the luminal surface, and smooth muscle cells (SMCs), which resided in the tubular collagen gel, were wrapped with thin segmented polyurethane elastomeric films designed to provide compliance matching with native arte…
Mitsubishi has developed a new zircalloy grid spacer for PWR fuel with higher thermal performance. Computational Fluid Dynamics (CFD) evaluation method has been applied for designing of the new lower pressure loss and higher Departure from Nucleate Boiling (DNB) benefit grid spacer. Reduction of pressure loss of grid…
Phase transitions in numerous anhydrous phosphates, vanadates and arsenates of mono- and bivalent elements are reviewed for researcher working in the field of ferroelectricity and ferroelasticity. Many of these phase transitions are either ferroelectric or ferroelastic, but some are reconstructive and, therefore, of n…
A laboratory-scale electrochemical cell was used for desulfurization of a synthetic fuel gas process stream containing up to 3000 ppm The cell was run at typical gasifier temperatures (600-650°C) and ambient pressure. The removal rate of can be limited either by gaseous diffusion from the fuel stream to the cathode-el…
The effect of moisture on the dielectric properties of porous aluminum oxide thin films is studied. It is observed that the capacitance of Au-porous Al2O3–Al structure gradually changes with time particularly when exposed at higher moisture content. This instability and degradation in the properties of nanoporous alum…
The effectiveness of diatoms and macroinvertebrates as indicators of environmental conditions in lotic systems was compared in a regional assessment. Benthic samples were collected during summer 2000 from 35 Provincial Water Quality Monitoring river stations in the Grand, Credit, Maitland and Upper Thames watersheds i…
The aggregation behavior of solute molecules in under- and supersaturated solutions was investigated using an organic compound p-acetanisidide (PAC) as a model compound and NMR method. The aggregation behavior was discussed by comparing the structure of aggregates with that of a single crystal determined by X-ray crys…
A novel asymmetrically substituted dicyano-tri-tert-butylphthalocyanine ((CN)2BuPc) with rectifying behavior has been synthesized. The morphology and conductive properties of (CN)2BuPc Langmuir–Blodgett (LB) films on mica and highly ordered pyrolytic graphite (HOPG) substrates were studied by atomic force microscopy (…
Electrochemical studies were performed in lithiated water (2.5 ppm Li and 1 ppm dissolved hydrogen) at 315°C in autoclave tests, on Zircaloy-2. Only the outside surface of the cladding was exposed to the environment. Specimens were corroded at open circuit potentials and also with externally imposed constant currents…
First-principles plane-wave pseudopotential calculations have been conducted to investigate Co impurities and native defects associated with oxygen excess in ZnO. The electronic states and formation energies are evaluated using the total energies of supercells. The electronic states indicate that Co impurities are don…
Tryptophan 128 of hydroxynitrile lyase of Manihot esculenta (MeHNL) covers a significant part of a hydrophobic channel that gives access to the active site of the enzyme. This residue was therefore substituted in the mutant MeHNL-W128A by alanine to study its importance for the substrate specificity of the enzyme. Wil…
Two different non‐oxide ceramics, Si 3 N 4 and SiC, were characterized with respect to their grain‐boundary structure employing both scanning and transmission electron microscopy. The latter method, which enables one to gain direct insight of the atomistic interface structure, was utilized to verify whether grain‐boun…
For the crystals TEA 2 ZnCl 4 , TEA 2 MnCl 4 and TEA 2 CuCl 4 , the temperature dependencies of complex dielectric constant were measured in the frequency range 300 Hz 1 1 MHz. The dielectric dispersion, clearly evident in the high-temperature phase in all crystallographic directions, was found to rapidly disappear at…
Abstract The physical process of the umbrella inversion of the nitrogen trifluoride molecule has been studied invoking the formalisms of the density functional theory, the frontier orbital theory, and the molecular orbital theory. An intuitive structure and dynamics of evolution of the transition state for the event o…
X-ray absorption spectroscopy (XAS) was used to study the electrochemical incorporation of perrhenate anion, from a 0.1 M solution, into poly(vinylferrocene) (PVFc) and a modified PVFc (a copolymer of 30% t -butyl acetylferrocene and 70% t -butyl divinyl ferrocene). The polymers were deposited on a carbon cloth curren…