Materials Literature
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The role of nonhydrodynamic relaxing processes in collective dynamics of pure liquids is studied within a generalized collective modes approach. A five-variable model of generalized hydrodynamics is solved analytically in long-wavelength limit. Among five collective modes we found three hydrodynamic and two relaxing k…
5,10,15,20-Tetrakis-[3α-(2,3,4,6-tetra- O -benzyl-β-D-glucopyranosyl)-5β-cholan-24-yl]porphyrin and 5,10,15,20-tetrakis-[3α-(2,3,4,6-tetra- O -benzyl-β-D-galactopyranosyl)-5β-cholan-24-yl]porphyrin were synthesized by condenzation of the respective steroid aldehydes and pyrrole-1-yl magnesium bromide.
The kinetic mechanism of the reaction between three kinds of silica glasses and HF acid solution was investigated systematically. The results indicate that the reaction rate is controlled by the chemical reaction, and depends on the breaking of the siloxane bonds in ≡Si-O-Si≡ network structure. The main factors influe…
This study is concerned with the split Hopkinson bar method for tension test of strip specimens. The split Hopkinson bar method (SHB) has been used for impact tests such as compression and shearing, and is currently modified for tension test. It is demanded that the impact tensile behaviour of high-tensile strength st…
Adsorption is a complex process often involving much more than simple ion exchange at the mineral surface. Previous studies on single-element systems show that adsorption of metals like Cd(II) onto kaolinite generally increases with increasing pH, and decreases with increasing ionic strength. However, little informati…
Most zirconium-containing commercial magnesium alloys also contain zinc, which varies from similar to 0.5% to similar to 6.5% depending upon the given alloy system. Early work has suggested that the presence of zinc in the range from 3% to 5% could significantly increase the solubility of zirconium in magnesium, there…
The characteristics of rapid solidification and microstructure formation of Fe-50wt%Sn hypermonotectic alloy heve been investigated. The rapid solidification microstructure is composed of regular arrays of fiberlike βSn phase, αFe phase distributed in fiber interspacings, and a small amount of metallic compounds. T…
The effect of pre-irradiation heat treatments on thermal non-equilibrium grain boundary segregation (TNES) and subsequent radiation-induced grain boundary segregation (RIS) is studied in a series of model austenitic stainless steels. The alloys used for this study are based on AISI 316 stainless steel and have the fol…
60 nm thick (SBT) thin films were fabricated using plasma-enhanced atomic layer deposition (ALD) with an alternating supply of single cocktail source and oxygen plasma. The linear relationship between the number of cycles and film thickness and a constant deposition rate with source pulse time suggests that a self-lim…
Equal-channel angular pressing (ECAP) was successfully applied to samples of an Al-1% Mg-0.2% Sc alloy in the form of plates. Pressings were conducted at room temperature using route BCZ in which the plates are rotated in the same direction by 90° around the vertical axis between each pass. Following ECAP, the grain s…
Abstract High barrier polymers are of increasing interest and use in nowadays food packaging applications. The reason for that is packaging being more often regarded as a very efficient and convenient means of preserving foodstuffs from deterioration during products handling, transport and shelf‐life. This study repor…
Perpendicular-laid and cross-laid highloft nonwoven fabrics are constructed of cotton, polyester, and bicomponent co-polyester bonding fibers. Kawabata parameters describing the compressional resistance and recovery of these fabrics are measured with a comput erized Q-test instrument. Results are obtained from tests r…
A low-pressure plasma surface treatment of polymeric powders was carried out in a circulating fluidized bed (CFB) reactor (10 mm-I.D. × 800 mm-high) with CF4 glow discharge. The effects of solid circulation rate, treatment time and radio frequency (rf) power of plasma on fluorination of high-density polyethylene (HDPE…
We studied the phase transformation of a new Heusler type ferromagnetic shape memory alloy, Co2NiGa, by using an Acoustic Elastometer method. The alloy displays large magnetostriction, caused by the magnetic-field-induced rearrangement of martensite twin boundary. The ribbon samples produced by rapidly solidified melt…
Alternate light illumination of ion-pairs of (3-perfluorooctanecarboxamido)propyltrimethylammonium azobenzene-4-carboxylate (FOAM–AzoB) at 340 and >440 nm was found to initiate a reversible photoisomerization between the E- and Z-azobenzene chromophores in multi-lamella films. This was in sharp contrast to the case of…
The possible mechanisms of the influence of implanted impurities of Group III and V elements on the luminescence properties of a system consisting of silicon nanocrystals in SiO 2 are considered and generalized. The effect of boron and nitrogen ion implantation on the photoluminescence intensity is investigated experi…
The effect of Y-Ce complex modification on the thermal fatigue (TF) behavior of cast hot working die steels was investigated and the mechanism of Y-Ce action was discussed. The experimental result showed that TF behavior of the steel modified by Y-Ce complex modification under thermal cycling temperatures of 650-25°C…
Dielectric properties of the rare earth cobaltates, LnCoO3 (Ln = La, Pr and Gd), have been measured over the 85–300 K range at different frequencies. The dielectric constants increase markedly across the low-spin to intermediate-spin state transitions of the Co3+ ions. The temperature variation of the loss-tangent dat…
Currently, the cutting and sewing process is utilized to produce medical products with tailored shape, which leads to a number of adverse consequences due to seams. These drawbacks have prompted us to undertake research to develop new methods by which seamless tubular woven products with inherent shape could be produc…
The treatment of the product of a thermal reaction of manganese(II) acetate tetrahydrate and trimethylacetic acid with triethylamine under reflux results in the unusual complex Mn3(μ,η2-OOCBut)4(μ-OOCBut)2[OC(But)OHNEt3]2, which, according to X-ray diffraction analysis, incorporates a linear Mn3 metal skeleton and fou…