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。
The fatigue resistance and tensile properties of a precipitate strengthened Cu–Ni–Si alloy have been investigated. Underaged material exhibited greater work hardening rates than either the peak aged or overaged material. It is proposed that this occurs because the δ-Ni2 Si precipitates can be cut by dislocations, but…
Polyglycolide (polyglycolic acid, PGA) was prepared by thermally induced solid-state polycondensation from sodium chloroacetate. This reaction leads to a composite of PGA with NaCl, out of which the latter can be extracted by washing with water. A highly porous polymer remains. The course of the reaction was followed…
Previous investigators have shown that, at high pressure, Re is a good capsule material and that Fe loss to Re under these conditions is minimal (e.g., Herzberg and Zhang 1997). We present here the first systematic low-pressure study of Re loop stability and of Fe loss from silicate melts to Re loops as a function off…
A quantitative study on α–β transition of Merino wool upon stretching has been carried out by wide angle X-ray diffraction using Merino wool fibre bundles. Technical factors affecting this determination, such as subtraction of air scattering and the measurement of crystallinity are considered. The degree of crystallin…
Peroxidase-catalyzed oxidative polymerization of m-substituted phenols has been performed in a mixture of a water-miscible organic solvent and buffer at room temperature under air to give a new class of polyphenols. The catalysts used were horseradish and soybean peroxidases (HRP and SBP, respectively). In the polymer…
We develop a mean-field rate-equation model for the kinetics of phase separation in binary mixtures with hard mobile impurities. For impurities preferentially wet by one of the components, the phase separation is arrested in the late stage. The "steady-state" domain size depends strongly on both the particle diffusion…
Various austenitic and ferritic steels were exposed on a water-cooled probe in the superheater area of a straw-fired CHP plant. The temperature of the probe ranged from 450–600°C and the period of exposure was 1400 hours. The rate of corrosion was assessed based on unattacked metal remaining. The corrosion products an…
Aqueous suspensions of alumina and other powders containing no visible morphological anisotropy were tape cast under different conditions to study the role of processing parameters and powder characteristics in the origin of in‐plane sintering shrinkage anisotropy. High anisotropic shrinkage, with the typical shrinkag…
We present the results of ultrafast pump–probe measurements on films of gold-coated gold sulfide nanoshells. The measured change in transmission (ΔT/T) agrees with theoretical calculations that relate the increase in the electron temperature to changes in the Drude and interband components of the gold shell dielectric…
Previous work has shown that when short-pitch cholesteric liquid crystals are aligned in cells with the helical axis in the plane of the substrate in a well-defined direction, then application of an electric field across the cells may result in microsecond in-plane switching due to the flexoelectric effect. Moreover,…
An irradiation behavior analysis code for metallic fast reactor fuel, ALFUS, has been revised so that it can be applied to stress-strain analysis of U-Pu-Zr ternary fuel pins. The stress-strain calculation in ALFUS is closely coupled with models for slug deformation mechanisms, such as swelling due to accumulation of…
We report on the possibility of modulating the transport properties of critical normal modes in Fibonacci quasicrystals by using the mass ratio as a tuning parameter. The relationship between the spatial structure and the transport properties of these modes is studied analytically in terms of the transmission and Lyap…
The local structure of a trapped photoexcited state of a Fe-Co cyanide magnetic material, ${\mathrm{Na}}_{0.4}{\mathrm{Co}}_{1.3}\mathrm{Fe}(\mathrm{CN}{)}_{6}\ensuremath{\cdot}5{\mathrm{H}}_{2}\mathrm{O},$ was investigated by Fe and Co K-edge x-ray-absorption fine-structure spectroscopy. The excited state was prepare…
The thermal degradation mechanisms of poly[2,2′-bis(3,4-dicarboxyphenoxy)phenylpropane-2-phenylenediimide] (PEI) have been investigated by thermogravimetry (TG) and by direct pyrolysis mass spectrometry (DPMS). TG data show that PEI has a main decomposition step centred at about 510°C followed by a less marked step in…
The stability and fluctuations of the cylinder (C) and sphere (S) morphologies in the vicinity of the C and S equilibrium have been examined for a poly(styrene- b -isoprene- b -styrene) triblock copolymer by rheology, small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). The spinodal tempera…
Hydroxyapatite (HAP) obtained from aqueous solutions under different conditions has been examined by high-resolution transmission electron microscopy (HRTEM) and electron diffraction, including selected-area electron diffraction (SAED) and microdiffraction. A Philips CM300 field-emission gun electron microscope with a…
Paint systems containing color-change or fluorescing compounds were found to be sensitive to underlying corrosion processes by reacting to the pH increase associated with the cathodic reaction that accompanies corrosion. The sensitivity of acrylic-based coating systems for detection of cathodic reactions associated wi…
The manufacture of fine‐grained SiC ceramics by using nanophase SiC powders with particle sizes of about 20 nm is described. Conventional sintering of these powders led to extreme grain growth and hence the nanophase microstructure was destroyed. Pressure‐assisted sintering was applied to reduce the sintering temperat…
Monodomain acrylate-based networks have been synthesized by a two-step cross-linking procedure using gamma-irradiation. Strain-induced reorientation of the nematic director is studied by X-ray diffraction measurements. The geometrical shape (aspect ratio) of the monodomain films is found to affect drastically the dyna…
There is a growing demand for the examination of protein microcrystals at third-generation synchrotron sources. After successful pilot experiments at EMBL/ESRF, which proved that protein microcrystals are often suitable for data collection, operation of the microfocus beamline ID13 was made more user-friendly and suit…