Materials Literature
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The formation of long-chain branches (LCBs) during ethylene polymerization with a combination of catalysts was studied by Monte Carlo simulation. The model describes polymerization with a non-branching catalyst that produces linear macromonomers, and a branching catalyst that produces linear and branched macromonomers…
The development of a detailed thermodynamic model of a fuel cell is presented. This model predicts the performance of a gas turbine and fuel cell systems integrated together in hybrid power generation cycles. The achievement of this goal involved the independent modelling of each component (prereformer, internal refor…
The isothermal formation of concentric colour domains has been observed in a cholesteric mixture doped with 10 wt % of a photochromic nematic material. The host cholesteric mixture included the Merck materials BL131a and BL130, while the photochromic dopant was a mixture of 4-n-butyl-4′-n-alkoxyazobenzenes (BAAB). The…
A short review is given on physical properties of strontium titanate, SrTiO3. Improper ferroelastic phase transition, incipient ferroelectricity, and a Müller phase are discussed. Specific properties of thin films are also considered
Electrochromic materials exhibit variable and reversible optical properties under the action of voltage pulses. The interest in these materials has increased in the last few years due to their potential application in a wide variety of optical modulation devices. Tungsten oxide (WO3) is typical in such devices. In thi…
The voltage distribution in a zinc oxide (ZnO) surge arrester under normal operating conditions has been observed to be non-uniform. The discs at the top are subjected to a higher voltage and hence thermal stresses, leading to a faster thermal ageing of these highly stressed discs. Therefore, efforts are generally mad…
Cryogenic liquids are claimed to have an impact on the concept of improved future power equipment. The low boiling temperature of liquid helium or liquid nitrogen offers the use of superconducting materials which eliminate ohmic losses in the conductors. This yields a high overall current density in the equipment. The…
The oxidation rate of high-purity Cu has been measured by means of thermogravimetry in oxygen in the pressure range to 1 atm and water vapor in the pressure range to 0.022 atm at 500°C, respectively, and as a function of temperature under wet (0.022 atm and dry conditions from 400 to 1000°C. The oxidation is parabolic…
The reaction of Eu(NO3)3·6H2O with amide type tripodal ligand L produces an unexpected three-dimensional network, which is directed by both coordinate and hydrogen bonds.
The novel spherical cluster-compound K2Na6[K20 [symbol: see text] Mo80-V22O282(SO4)12(H2O)66]. approximately 140H2O 1 has been obtained in a 'one-pot' reaction and exhibits several remarkable structural features: 30 open shell centers, i.e. 8 Mov and 22 VIV spanning an icosidodecahedron, the incorporation of 20 K+ cat…
Solid solutions of the form Ba(Ce1 − xBix)O3 (x = 0.0–0.5) have been prepared by a modified Pechini method at 800 °C in air. XRD results indicate that all the samples have orthorhombic symmetry. Ba(Ce1 − xBix)O3 shows no reaction with Ce0.9Gd0.1O2, even when sintered at 1100 °C, but totally decomposes when mixed with…
We discuss different methods to grow organic single crystalline thin films from solution. Specifically, we address exploratory developments and apply them on the highly nonlinear material DAST (4′-dimethylamino-N-methyl-4-stilbazolium tosylate) in a DAST/methanol system. We describe the nucleation and growth thermodyn…
A novel process employing solid electrolyte-based ion-transport membranes enables the production of high-purity oxygen at elevated pressure from a feed stream of ambient pressure air. This technology exploits the theoretically infinite selectivity of oxygen ion migration through a dense ceramic electrolyte membrane un…
SUMMARIES Paper is a composite material, which makes interpretation of experiments extremely difficult. Nevertheless, the data obtained so far on a limited amount of samples support the theory that higher pH values may have a negative effect on the stability of paper made from bleached chemical pulps. Higher pH accomp…
We construct complete bounded minimal surfaces in ℝ<sup>3</sup> with arbitrary topological genus.
The densification kinetics and mechanism of a low‐temperature cofirable borosilicate glass (BSG) + alumina during the constrained sintering of a sandwich structure of alumina/(BSG + alumina)/alumina has been studied. The densification kinetics becomes slower when the BSG + alumina tape is constrained during firing. Ho…
No abstract prepared.
We propose a solid oxide fuel cell design based on a configuration of two electrodes on the same surface of the electrolyte in a flowing mixture of different hydrocarbons and air between 500 and 600°C. The ohmic resistance can be reduced without using a thin electrolyte film due to a significantly enhanced performance…
Modified tripyrranes incorporating furan and thiophene rings were found to condense with benzene, pyridine and indene dialdehydes to give a series of novel porphyrin analogues, including thia- and oxa-carbaporphyrins; the latter readily forms nickel(II) and palladium(II) organometallic complexes.
Ultrafine-grained structure formed dynamically through severe plastic deformation at elevated temperatures has been investigated in a 0.1% C-0.4% Si-1.5% Mn steel. The effects of the strain, the strain rate and the deformation temperature on the microstructural evolution were examined using a compression technique wit…