Materials Literature
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The semiconductor-metal-semiconductor transitions in stoichiometric FeS compounds were observed under nearly hydrostatic pressure condition up to 8 GPa and a temperature down to 4 K. In the low-pressure semiconductor state, the energy gap caused by the electron correlation decreases with a volume reduction. On the oth…
The thermal expansion behaviour of silver fcc has been described by an anharmonic Einstein model using EXAFS data in the temperature range between 10 and 300 K. The linear expansion coefficient of a bulk silver foil agrees well with X-ray diffraction data. In the case of silver particles embedded in a silicate glass m…
Numerical simulations are presented that document the strong effect of a previously underappreciated portion of two‐stage thermal treatments used in the study of nucleation processes: the “heat‐up” process whereby samples are heated from “nucleation” conditions to “growth” conditions. The simulations indicate that two…
NAD+-dependent formate dehydrogenase (FDH) from Candida boidinii was cloned and expressed to a high level in Escherichia coli (20% of soluble E. coli protein). Molecular modelling studies were used to create a three-dimensional model of C. boidinii FDH, based on a known structure of the Pseudomonas sp. 101 enzyme. Thi…
Diamond films were grown by a 5-kW microwave plasma CVD reactor with an input microwave power of 2.0–4.5 kW at a gas pressure of 100–120 torr using CH 4 –H 2 –O 2 gas mixtures , and the growth rate, surface morphology , film texture as well as the quality of the films, were examined. The highest growth rate achieved u…
The magnetic properties of LaFeO3–LaCrO3 superlattices have been artificially controlled by adjusting the atomic order of the B site ions via changes of the stacking direction of the 〈100〉, 〈110〉 and 〈111〉 planes and adjustment of the stacking periodicity. When Fe and Cr layers are atomically stacked along the 〈111〉 d…
A conclusive safety assessment of a fusion reactor requires that the thermal response of the divertor assembly is known with a high degree of accuracy. Such accuracy is mandated because the divertor assembly is subjected to the highest levels of incident heat flux within the reactor. In order to accurately predict the…
Abstract The effect of tale on the b ‐axis orientation of the polypropylene crystals in polypropylene (PP)/ethylene‐propylene rubber (EPR)/talc blends of injection moulding was examined using the X‐ray diffraction method. The b ‐axes of the PP crystals were most strongly oriented in the thickness direction for the inj…
Rosalind Franklin's earliest research involved studies of coal, carbon, and graphite. She made a number of enduring contributions in these areas, most notably identifying the fundamental distinction between graphitising and non-graphitising carbons. Her work on carbon also provided a valuable background for her later…
Friedel's salt, a mineral anion exchanger belonging to the family of the layered double hydroxides (LDHs), was synthesized and used as a novel electrode modifier for the accumulation of iodide species and their subsequent voltammetric determination at carbon paste. Beside the preconcentration features of Friedel's sal…
Abstract Soluble organoiron polyethers, thioethers, and amines were synthesized via nucleophilic aromatic substitution reactions. The synthesis of these classes of organometallic polymers involved either the reaction of cyclopentadienyliron complexes of dichloroarenes with various oxygen and sulfur dinucleophiles or t…
Rubber toughening usually involves the addition of rubber particles to a rigid polymer in order to promote energy absorption through the initiation of local yielding, which takes the form of multiple crazing and/or extensive shear yielding. In addition to these classic mechanisms, recent studies of deformation mechani…
Tungsten oxide thin films with different stoichiometry have been deposited on In2O3 : SnO2 glass (ITO) and Si wafer by pulsed laser deposition (PLD) technique at different deposition temperatures and oxygen pressure. The structural properties of WO3 thin films were analyzed by using a scanning accessory of transmissio…
Charpy impact tests of Japanese and US reference V-4Cr-4Ti alloys, NIFS-HEAT-1 (180 wppm oxygen) and US832665 (310 wppm Oxygen), were examined after gas-tungsten-arc (GTA) welding in a purified argon atmosphere. To investigate the effects of further reduction of oxygen level in the fusion zone, filler wires made of HP…
Macor® machinable glass-ceramic and commercially pure (cp.) titanium were joined by active metal brazing, using a 64Ag–34.5Cu–1.5Ti (wt.%) filler alloy. The influence of the brazing temperature and holding stage on the microstructure and hardness profile of the interface, as well as on the shear strength of the joint,…
Previously, we showed that exposure of human osteoblasts to titanium particles stimulates protein tyrosine phosphorylation (PTP), activates the transcription factor nuclear factor kappaB (NF-kappaB), and causes an approximately 50% decrease in the steady-state messenger RNA (mRNA) level of procollagen alpha1[I]. In th…
Thin films of boron carbide were formed by pulsed laser deposition at room temperature using a sintered B4C target. The nature of the particulates embedded in the films and the composition and bonding states of the films varied depending on the laser fluence. The formation of non-stoichiometric amorphous films appeare…
Short-range atomic structures including the chemical environment and interatomic distance along the in- and out-of-plane directions in [Co (1 ML)/Pd(3 ML)]13 multilayer films (ML notes monolayer) are studied using polarized Co K-edge extended x-ray absorption fine structure. The chemical Co environment is found to be…
The melting temperature (Tm) of thin poly[ethylene-co-(vinyl acetate)] films coated on a silicon wafer was investigated. Ellipsometry was used to measure the Tm which was found to decrease dramatically when the thickness of the film is less than 300 Å. The relationship between the lamellar thickness and the Tm was tho…
The purpose of this research is to study the pressure drop profiles of biodegradable polybutylene succinate (PBS)/CO2 solutions in a slit die and to measure the rheological properties of the solutions as a function of the blowing agent concentration. A slit die with four pressure transducers has been designed to descr…