Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Aromatic dicarboxylic acids, such as terephthalic (TPA) and isophthalic (IPA) acids having different structures of the activated carboxyl groups were prepared in situ by the reaction of the diacids with TsCl/DMF/Py containing various amounts of DMF. The polycondensation involved by these carboxyl groups using 0.3 equi…
Polyimides with a unique combination of properties including low colour in thin films, atomic oxygen (AO) resistance, ultra-violet (UV) radiation resistance, solubility in organic solvents in the imide form, high glass transition ( T g ) temperatures, and high thermal stability have been prepared and characterized. Po…
In the first part of this paper the results of a literature review are presented. Here we provide an overview of the materials that are suitable for long term service in oxidizing atmospheres at temperatures of 1500°C and higher. Criteria are a sufficient stability against the surrounding environment, low vapor pressu…
Methods to reveal the macrostructure of spheroidal graphite cast iron (SGI) are not available. This has caused a number of controversies involving the solidification mechanism of this metallic alloy. The objective of the present work is to examine the use of a novel technique (DAAS) reported recently, to reveal the so…
The influence of precipitates on the development of microstructure and crystallographic texture during cold rolling was investigated in particle-containing Al-Cu and Al-Mn single crystals with the initial orientations (011)[100], (011)[211] and (112)[111]. Analysis of the X-ray rolling textures yielded broad scatter o…
The corrosion behaviour of type 316 stainless steel has been investigated in F- containing dilute hydrochloric acid and acetic acid solutions aerated with oxygen gas at 25°C using electrochemical measurement techniques. Both electrochemical impedance spectroscopy spectra and polarisation curves illustrate that 316 sta…
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…