Materials Literature
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Superplasticity is generally associated with fine grains, grain boundary sliding, accommodation, high tensile ductility and high strain-rate-sensitivity at elevated temperatures. This paper reviews some of the recent important findings in very fine-grained superplastic materials, including the areas of high-strain-rat…
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The development of 9-12% chromium steels is reported to have originated in 1912 with the manufacture of a 12%Cr:2-5% Mo steel for steam turbine blades by Krupp and Mannesmann in Germany [1,2]. However, in 1912-13 Brearley in the U.K., while attempting to develop high-temperature steels for gun barrels, accidentally di…
The dinuclear cobalt porphyrin of (5,10,15,20-tetrakis(N-methyl-4-pyridinio)porphyrinato)cobalt(II) (CoTMPyP) with (5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrinato)cobaltate(II) (CoTPPS) has allowed spectroelectrochemical analysis of electron transfer processes in DMSO. In the II–II valence state it undergoes stepw…
In order to clarify the relationship between electroluminescence (EL) and degradation in crosslinked polyethylene (XLPE), the EL measurement was carried out using three kinds of samples, block samples with two different electrode systems, and film samples. The spectral measurements revealed that the UV component of EL…
Abstract [(Por)M(R)(OOR′)] + Y − (Por: TPP [tetraphenylporphyrin], OEP [octaethylporphyrin]; M: Sb, As, P; R: Me, Et, Ph; R′: H, C(=O)m‐ClC 6 H 4 , t‐Bu) were prepared from [(Por)M(R)(X)] + Y − (X: OTf, Br). The reactivities of the peroxide porphyrins toward nucleophiles such as triphenylphosphine increased in the ord…
Electrical resistivity, infrared absorption and reflectivity measurements of a single crystal of black phosphorus have been carried out under pressure in order to clarify the semiconductor–semimetal transition. The resistivity showed a typical metallic temperature dependence at 1.8 GPa while a singular temperature dep…
An ordered head-to-tail (HT) polyurethane was successfully prepared by the polyaddition reaction of p-isocyanatobenzyl isocyanate with ethylene glycol with dibutyltin dilaurate as a catalyst. Furthermore, the HT regularity of polyurethane was improved to 83% with 1,1,3,3-tetraphenyl-1,3-dichlorodistannoxane. The polym…
The susceptibility to hydrogen embrittlement of a bainite/martensite dual-phase high strength steel with different morphologies obtained by the conventional or thermomechanical heat-treatment has been investigated by means of electrolytic hydrogen charging in this paper. The results show that the finer the microstruct…
and stoichiometric air-fuel ratio combustion system, with the lower output engines using the stoichiometric air-fuel ratio combustion system while the medium and large size engines adopting the lean-burn system. The lean-burn system generally features in high generating efficiency and low NOx emission in addition to t…
Abstract Time‐dependent density functional theory (TDDFT) calculations have been performed on the excitation energies and oscillator strengths of the Q‐like bands of three structural isomers of phenylene‐linked free‐base (FBP) and zinc (ZnP) porphyrin dimers. The TDDFT calculated results on the low‐lying excited state…
Buluh semantan (Gigantochloa scortechinii), one of the most widespread bamboo species in Peninsular Malaysia was investigated for its suitability as a raw material for particleboard production. A total of 120 bamboo culms from three different age group (1-,2 and 3-y-old) were harvested from managed bamboo clumps in FR…
This paper describes the development and optimization of chiral, nonpolar media with large second-order nonlinear optical responses. We employ molecular engineering, quantum-mechanical sum-over-states theory, and measurements of molecular hyperpolarizability by means of Kleinman-disallowed hyper-Rayleigh scattering in…
Impact tests at low temperatures were carried out, aimed at comparing the response of five spheroidal graphite (SG) cast iron with different microstructures and to analyze the influence of the solidification structure size. "Y" blocks with two different thicknesses (13 and 75 mm) were cast using the same industrial me…
Attempts have been made to evaluate the degree of bioadhesion and biocompatibility of a synthesized urethane prepolymer with specially tailored microstructure. Wetting behaviour and extent of interfacial adhesion of the prepared prepolymer towards biological substrates were examined by in vitro methods. The former was…
SiC/SiC composite material is one of the candidates of plasma facing and structural materials for a fusion reactor. In an inertial fusion reactor and a magnetic confinement fusion reactor, interactions of solid and liquid breeder materials as well as coolant materials with various structural materials are considered t…
It has been shown experimentally in a single-layer microwave absorber that a matching frequency can be adjusted in the frequency range from 7.7GHz to 9.4GHz. A reflection loss above -40dB or more in maintained by changing the mixing ratio of magnetic and dielectric material in the composite. Complex relative permeabil…
Three-dimensional computer models were used to simulate transmission electron micrographs in order to determine the effects of changes in microfibril orientation and arrangement on the appearance of ultrastructural images based on thin sections. It is shown that the tangential fibrillar texture commonly associated wit…
Crystalline PbTiO 3 thin films were successfully deposited on (111)‐oriented Pt/Ti/SiO 2 /Si and on (200)‐oriented Pt/SiO 2 /Si by metalorganic chemical vapor deposition at a substrate temperature of 400°C, using a β‐diketonate complex of Pb(tmhd) 2 (tmhd = 2,2,6,6‐tetramethyl‐3,5‐heptanedionate) and titanium isopropo…
A ZK60 alloy was subjected to severe plastic deformation by torsion straining under high pressure at ambient temperature. The data of microhardness measurements, X-ray analysis and TEM observation showed that intense plastic straining resulted in formation of nanometer-scale structure characterized by presence of high…