Materials Literature
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Cold headability is the ability of a cylindrical metallic specimen to be shaped at high strain rate into the head of a bolt, screw or other cold-formed part without cracking. This property is material dependent and can be influenced by many factors such as chemical composition, surface condition, and microstructure. T…
The π-donor strength of extended tetrathiafulvalenes (TTFs) has been investigated as a function of the electronic character and length of the spacer between the two dithiole rings. First and second ionisation energies were calculated with B3LYP/6-311++G(2d,p)//B3LYP/6-31+G(d) and B3LYP/6-311++G(2d,p)//PM3 computationa…
Honeycomb patterned polystyrene film was prepared from a polystyrene chloroform solution including polyion complexes by solvent evaporation under high atmospheric humidity. Formation of the honeycomb pattern was owing to the hexagonally packed water droplets which condensed onto the polymer solution. The pore diameter…
Tensile ductility of magnesium alloy ZK60 pre-strained by warm equal channel angular extrusion (ECAE) was investigated at 300°C. It was shown that a significant ductility (262%) is achievable with this technique for a fairly high strain rate of 3·10−3 s−1. The effect of pre-straining by warm ECAE on twinning under roo…
Synthesis and electronic properties of a dinuclear (bpy)(2)Ru(II) polypyridyl complex are described in which the bridging ligand consists of two dipyridophenazines fused to a formally antiaromatic dehydro[12]annulene and where the electronic and electrochemical properties of the complex are markedly influenced by the…
The copper precursors bis-hexafluoroacetylacetonato-copper vinyl-trimethyl-silane-copper(I) hexafluoroacetylacetonate (hfac)Cu(VTMS), 2-methyl-1-hexen-3-yne-copper hexafluoroacetylacetonate (hfac)Cu(MHY), and dimethylbutenecopper(I) hexafluoroacetylacetonate (hfac)Cu(DMB) are compared with respect to deposition rates…
The ferrite and austenite stainless steels containing a suitable amount of Cu may be of antibacterial ability after a special antibacterial treatment. The distribution and appearance of the precipitates appeared in the Cu-contained stainless steels were studied with TEM. The results of antibacterial examination show t…
Biopolymers were produced by using Alcaligenes eutrophus microorganisms. Some of substrates such as glucose, sucrose, butyric, pentanoic and propanoic acids used as carbon sources affect the accumulation and composition of biopolymers in the cell. The maximum polymer production (0.97 g/L) was obtained when 2.0 g gluco…
The Forest Products Laboratory uses the cone calorimeter for the initial evaluation of the flammability of untreated and fire retardant treated wood products. The results of various studies are reviewed using a model presented at the 12th Annual BBC Conference on Flame Retardancy. The model uses data from the cone cal…
Abstract Infrared (IR) spectroscopy was used to study the surface (by means of external reflection) and the bulk (by means of transmission measurements on microtomed slices) of specimens obtained by injection moulding of a commercial polyamide‐6 clay‐based nanocomposite material (NCH = nylon clay hybrid) at different…
The potential loss of the C2h symmetry in 7-azaindole dimer caused by the interaction with a polar molecule or environment was examined in a 10−4 M solution of this compound in 2-methylbutane containing 4 × 10−5 M 1-chlorobutane and in pure 1-chlorobutane at a low temperature, respectively, in the light of the proton…
This article describes the design of a yarn spinning model based on the use of artificial neural networks, as well as the measurements aimed at collecting the data necessary for this model. Partial models of the spinning process were designed for selected essential yarn quality parameters, such as tenacity, yarn hairi…
A Rotary-die equal-channel angular pressing (RD-ECAP) process was applied to improve the impact toughness of Al-11 mass%Si eutectic alloy (AC8A). RD-ECAP was effective at improving impact toughness: the impact toughness increased as the number of pressings increased. In addition, the effects of heat treatments on impa…
The effect of hot band grain size on the texture of low silicon steels was investigated. In spite of different hot band grain sizes (22, 125 and 500 μm), the deformation texture is formed by the fibers ‹111›//ND and ‹110›//RD. Nevertheless the recrystallization texture is strongly affected. Increasing the hot band gra…
We have deposited ZnO films on various substrates using the r.f. magnetron sputtering method. X-ray diffraction and scanning electron microscopy coincidentally revealed that the larger grain size and the higher crystallinity were attained when the ZnO films were deposited on sapphire substrates, compared to the films…
Small amounts of silver ions have been found to significantly enhance the growth rate of vanadium pentoxide (V(2)O(5)) nanofibres in aqueous solution at room temperature, yielding fibres with lengths of several micrometers within a few days; the V(2)O(5) fibres are decorated with silver nanoparticles with sizes in the…
Spontaneous symmetry breaking in achiral and racemic materials is reviewed in terms of the so-called banana-shaped liquid crystal materials. Some novel results are reported in the area of conventional liquid crystal phases generated by achiral, bent-shaped molecular architectures where the smectic C phase is seen to c…
Thermal methods of analysis are now used in a very large range of scientific investigations. In this work simultaneous thermogravimetry-differential thermal analysis (TG-DTA), X-Ray powder diffractometry and infrared spectroscopy were used to study the derivative compounds of purine, i. e. aminophylline, theophylline,…
Skin impedance measurements at various skin sites yield different impedance loci for normal skin and special skin sites. The results of skin impedance measurements taken at such sites with a two-electrode measurement system are presented herein. Some of these sites can be identified as acupuncture points. Data from 4…
A 90/spl deg/-angle wedge that is isorefractive to the surrounding medium is considered. Under symmetrical incidence by two plane waves of appropriate amplitude, phase and polarization propagating in opposite directions, the edge of the wedge does not scatter and geometrical optics provides the exact solution to the b…